Digital Camera Patent Abstract
A compact through-the-lens digital camera comprising an objective
lens unit, an image sensing device, an internal display device,
an eye lens unit, an optical system, control and processing circuitry,
function select controls, and an external interface. The optical
system is switchable between an image framing mode optical path,
wherein light is directed from the objective lens unit to the eye
lens unit, an image capture mode optical path, wherein light is
directed from the objective lens unit to the image sensing device,
and an image review mode optical path, wherein light is directed
from the display device to the eye lens unit. The control and processing
circuitry switches the optical system between the image framing
mode optical path, the image capture mode optical path and the image
review mode optical path and controls the image capture, processing,
storage and display on the display device, the operation of the
zoom and auto focus functions and function select controls and external
communication through the external interface. Digital Camera Patent Claims
What is claimed is:
1. A camera comprising:
an objective lens structured to receive light from outside the
camera;
an image sensing device;
a display device;
an eye lens;
an optical system switchable between a TTL mode optical path wherein
light is directed from said objective lens to said eye lens, a picture
taking mode optical path wherein light is directed from said objective
lens to said image sensing device, and a review mode optical path
wherein light is directed from said display device to said eye lens;
and
control means for switching said optical system between said TTL
mode optical path, said picture taking mode optical path and said
review mode optical path.
2. The camera of claim 1, wherein said TTL mode optical path comprises
first and second image direction diverting devices, said first image
direction diverting device being structured and disposed to direct
light from said objective lens to said second image direction diverting
device and said second image direction diverting device being structured
and disposed to direct light from said first image direction diverting
device to said eye lens.
3. The camera of claim 2, wherein said first image direction diverting
device is movable from a first diverting position, where it is in
said TTL mode optical path and directs light from said objective
lens to said second image direction diverting device, to a second
non-diverting position, where it is out of said TTL mode optical
path and does not direct light from said objective lens to said
second image direction diverting device, and wherein movement of
said first image direction diverting structure is controlled and
driven by said control means.
4. The camera of claim 1, wherein said picture taking mode optical
path comprises an image direction diverting device structured and
disposed to direct light from said objective lens to said image
sensing device.
5. The camera of claim 1, wherein said review mode optical path
comprises first and second image direction diverting devices, said
first image direction diverting device being structured and disposed
to direct light from said display device to said second image direction
diverting device and said second image direction diverting device
being structured and disposed to direct light from said first image
direction diverting device to said eye lens.
6. The camera of claim 5, wherein said first image direction diverting
device is movable from a first diverting position, where it is in
said review mode optical path and directs light from said display
device to said second image direction diverting device, to a second
non-diverting position, where it is out of said review mode optical
path and does not direct light from said display device to said
second image direction diverting device, and wherein movement of
said first image direction diverting device is controlled and driven
by said control means.
7. The camera of claim 1, wherein said control means includes at
least one user input button structured to control said control means.
8. The camera of claim 1 wherein said objective lens is a zoom
lens unit controlled and driven by said control means.
9. The camera of claim 3, wherein said picture taking mode optical
path comprises a third image direction diverting device structured
and disposed to direct light from said objective lens to said image
sensing device.
10. The camera of claim 9, wherein said first image direction diverting
device is structured to allow some light to pass thereby and said
third image direction diverting device is positioned behind said
first image direction diverting device so that it receives light
from said objective lens when said first image direction diverting
device is in said first diverting position and said second non-diverting
position.
11. The camera of claim 3, wherein said review mode optical path
comprises a fourth image direction diverting device structured and
disposed to direct light from said display device to said second
image direction diverting device.
12. The camera of claim 11, wherein said fourth image direction
diverting device is movable from a first diverting position, where
it is in said review mode optical path and directs light from said
display device to said second image direction diverting device,
to a second non-diverting position, where it is out of said review
mode optical path and does not direct light from said display device
to said second image direction diverting device, and wherein movement
of said fourth image direction diverting device is controlled and
driven by said control means.
13. The camera of claim 12, wherein said first and fourth image
direction diverting devices move in unison with one another so that
when said first image direction diverting structure is in said first
diverting position, said fourth image direction diverting structure
is in said second non-diverting position, and when said first image
direction diverting structure is in said second non-diverting position,
said fourth image direction diverting structure is in said first
diverting position.
14. The camera of claim 10, wherein said review mode optical path
comprises a fourth image direction diverting device structured and
disposed to direct light from said display device to said second
image direction diverting device.
15. The camera of claim 14, wherein said fourth image direction
diverting device is movable from a first diverting position, where
it is in said review mode optical path and directs light from said
display device to said second image direction diverting device,
to a second non-diverting position, where it is out of said review
mode optical path and does not direct light from said display device
to said second image direction diverting device, and wherein movement
of said fourth image direction diverting device is controlled and
driven by said control means.
16. The camera of claim 15, wherein said first and fourth image
direction diverting devices move in unison with one another so that
when said first image direction diverting structure is in said first
diverting position, said fourth image direction diverting structure
is in said second non-diverting position, and when said first image
direction diverting structure is in said second non-diverting position,
said fourth image direction diverting structure is in said first
diverting position.
17. A camera comprising:
a housing having a front face and a rear face, said housing having
a length X, a width Y and a height Z, said length X being greater
than said width Y and said height Z, and said width Y being greater
than said height Z;
an objective lens structured to receive light through said front
face;
an image sensing device disposed within said housing;
a display device disposed within said housing;
an eye lens disposed on said rear face;
an optical system switchable between a TTL mode optical path wherein
light is directed from said objective lens to said eye lens, a picture
taking mode optical path wherein light is directed from said objective
lens to said image sensing device, and a review mode optical path
wherein light is directed from said display device to said eye lens;
control means for switching said optical system between said TTL
mode optical path, said picture taking mode optical path and said
review mode optical path; and
wherein said TTL mode optical path is disposed in a single plane
defined by said length X and said width Y.
18. The camera of claim 17, wherein said TTL mode optical path
comprises first and second image direction diverting devices, said
first image direction diverting device being structured and disposed
to direct light from said objective lens to said second image direction
diverting device and said second image direction diverting device
being structured and disposed to direct light from said first image
direction diverting device to said eye lens.
19. The camera of claim 18, wherein said first image direction
diverting device is movable from a first diverting position, where
it is in said TTL mode optical path and directs light from said
objective lens to said second image direction diverting device,
to a second non-diverting position, where it is out of said TTL
mode optical path and does not direct light from said objective
lens to said second image direction diverting device, and wherein
movement of said first image direction diverting structure is controlled
and driven by said control means.
20. The camera of claim 17, wherein said picture taking mode optical
path comprises an image direction diverting device structured and
disposed to direct light from said objective lens to said image
sensing device.
21. The camera of claim 17, wherein said review mode optical path
comprises first and second image direction diverting devices, said
first image direction diverting device being structured and disposed
to direct light from said display device to said second image direction
diverting device and said second image direction diverting device
being structured and disposed to direct light from said first image
direction diverting device to said eye lens.
22. The camera of claim 21, wherein said first image direction
diverting device is movable from a first diverting position, where
it is in said review mode optical path and directs light from said
display device to said second image direction diverting device,
to a second non-diverting position, where it is out of said review
mode optical path and does not direct light from said display device
to said second image direction diverting device, and wherein movement
of said first image direction diverting device is controlled and
driven by said control means.
23. The camera of claim 19, wherein said picture taking mode optical
path comprises a third image direction diverting device structured
and disposed to direct light from said objective lens to said image
sensing device.
24. The camera of claim 23, wherein said first image direction
diverting device is structured to allow some light to pass thereby
and said third image direction diverting device is positioned behind
said first image direction diverting device so that it receives
light from said objective lens when said first image direction diverting
device is in said first diverting position and said second non-diverting
position.
25. The camera of claim 19, wherein said review mode optical path
comprises a fourth image direction diverting device structured and
disposed to direct light from said display device to said second
image direction diverting device.
26. The camera of claim 25, wherein said fourth image direction
diverting device is movable from a first diverting position, where
it is in said review mode optical path and directs light from said
display device to said second image direction diverting device,
to a second non-diverting position, where it is out of said review
mode optical path and does not direct light from said display device
to said second image direction diverting device, and wherein movement
of said fourth image direction diverting device is controlled and
driven by said control means.
27. The camera of claim 26, wherein said first and fourth image
direction diverting devices move in unison with one another so that
when said first image direction diverting structure is in said first
diverting position, said fourth image direction diverting structure
is in said second non-diverting position, and when said first image
direction diverting structure is in said second non-diverting position,
said fourth image direction diverting structure is in said first
diverting position.
28. The camera of claim 24, wherein said review mode optical path
comprises a fourth image direction diverting device structured and
disposed to direct light from said display device to said second
image direction diverting device.
29. The camera of claim 28, wherein said fourth image direction
diverting device is movable from a first diverting position, where
it is in said review mode optical path and directs light from said
display device to said second image direction diverting device,
to a second non-diverting position, where it is out of said review
mode optical path and does not direct light from said display device
to said second image direction diverting device, and wherein movement
of said fourth image direction diverting device is controlled and
driven by said control means.
30. The camera of claim 29, wherein said first and fourth image
direction diverting devices move in unison with one another so that
when said first image direction diverting structure is in said first
diverting position, said fourth image direction diverting structure
is in said second non-diverting position, and when said first image
direction diverting structure is in said second non-diverting position,
said fourth image direction diverting structure is in said first
diverting position.
31. The camera of claim 17 wherein said objective lens is a zoom
lens unit controlled and driven by said control means.
32. The camera of claim 8, wherein said zoom lens unit comprises:
a first lens group positioned along an optical axis of said objective
lens;
a second lens group positioned along said optical axis;
a first drive motor;
a cam gear coupled to said second lens group and having a downward
sloping outer cam surface;
a first gear system coupling said first drive motor to said cam
gear;
said cam gear being structured and disposed so that rotational
movement of said first drive motor is translated into axial movement
of said second lens group along said optical axis;
a first lever arm coupled to said first lens group and having a
first fixed end and an opposite second free end defining a cam follower,
said cam follower being structured and disposed to slidingly engage
said cam surface, wherein rotational movement of said first drive
motor causes said cam follower to slide up and down said cam surface
and said first lens group to move along said optical axis.
33. The camera of claim 32, wherein said cam gear is generally
triangular shaped and includes an upper distal end coupled to said
second lens group and a generally centrally disposed gear slot structured
for mating engagement with a gear from said first gear system.
34. The camera of claim 32 further comprising a second lever arm
coupling said first lever arm to said first lens group.
35. The camera of claim 34, wherein said first and second lever
arms are attached to one another at a general central portion thereof,
and wherein said second lever arm includes an outer distal end attached
to said first lens group.
36. The camera of claim 35 further comprising a focusing system
having a second drive motor and a second gear system coupling said
second drive motor to said second lever arm, said second gear system
and said second lever arm being structured and disposed so that
rotational movement of said second drive motor is translated into
axial movement of said first lens group along said optical axis,
said focusing system being controlled and driven by said control
means.
37. A zoom lens unit for a camera comprising:
an optical axis;
a first lens group and a second lens positioned along said optical
axis;
a first drive motor;
a cam gear coupled to said second lens group and having a downward
sloping outer cam surface;
a first gear system coupling said first drive motor to said cam
gear;
said cam gear being structured and disposed so that rotational
movement of said first drive motor is translated into axial movement
of said second lens group along said optical axis;
a first lever arm coupled to said first lens group and having a
first fixed end and an opposite second free end defining a cam follower,
said cam follower being structured and disposed to slidingly engage
said cam surface, wherein rotational movement of said first drive
motor causes said cam follower to slide up and down said cam surface
and said first lens group to move along said optical axis.
38. The camera of claim 37, wherein said cam gear is generally
triangular shaped and includes an upper distal end coupled to said
second lens group and a generally centrally disposed gear slot structured
for mating engagement with a gear from said first gear system.
39. The camera of claim 37 further comprising a second lever arm
coupling said first lever arm to said first lens group.
40. The camera of claim 39, wherein said first and second lever
arms are attached to one another at a general central portion thereof,
and wherein said second lever arm includes an outer distal end attached
to said first lens group.
41. The camera of claim 40 further comprising a focusing system
having a second drive motor and a second gear system coupling said
second drive motor to said second lever arm, said second gear system
and said second lever arm being structured and disposed so that
rotational movement of said second drive motor is translated into
axial movement of said first lens group along said optical axis.
42. The camera of claim 31, wherein said zoom lens unit comprises:
a first lens group positioned along an optical axis of said objective
lens;
a second lens group positioned along said optical axis;
a first drive motor;
a cam gear coupled to said second lens group and having a downward
sloping outer cam surface;
a first gear system coupling said first drive motor to said cam
gear;
said cam gear being structured and disposed so that rotational
movement of said first drive motor is translated into axial movement
of said second lens group along said optical axis; and
a first lever arm coupled to said first lens group and having a
first fixed end and an opposite second free end defining a cam follower,
said cam follower being structured and disposed to slidingly engage
said cam surface, wherein rotational movement of said first drive
motor causes said cam follower to slide up and down said cam surface
and said first lens group to move along said optical axis.
43. The camera of claim 42, wherein said cam gear is generally
triangular shaped and includes an upper distal end coupled to said
second lens group and a generally centrally disposed gear slot structured
for mating engagement with a gear from said first gear system.
44. The camera of claim 42 further comprising a second lever arm
coupling said first lever arm to said first lens group.
45. The camera of claim 44, wherein said first and second lever
arms are attached to one another at a general central portion thereof,
and wherein said second lever arm includes an outer distal end attached
to said first lens group.
46. The camera of claim 45 further comprising a focusing system
having a second drive motor and a second gear system coupling said
second drive motor to said second lever arm, said second gear system
and said second lever arm being structured and disposed so that
rotational movement of said second drive motor is translated into
axial movement of said first lens group along said optical axis,
said focusing system being controlled and driven by said control
means.
47. The camera of claim 17, wherein said control means includes
at least one user input button structured to control said control
means.
48. The camera of claim 1 wherein said objective lens has a first
lens group and a second lens group, said camera further comprising
a focusing system comprising:
a drive motor;
a first lever arm having an outer distal end secured to one of
said at least one of said first and second lens groups;
a gear system coupling said drive motor to said first lever arm,
said gear system and said first lever arm being structured and disposed
so that rotational movement of said drive motor is translated into
axial movement of said one of said at least one of said first and
second lens groups along said optical axis.
49. The focusing system of claim 48, further comprising a second
lever arm, said first and second lever arms being pivotally attached
to one another at a general central portion thereof so that said
first lever arm may pivot about said central portion.
50. The camera of claim 17 wherein said objective lens has a first
lens group and a second lens group, said camera further comprising
a focusing system comprising:
a drive motor;
a first lever arm having an outer distal end secured to one of
said at least one of said first and second lens groups;
a gear system coupling said drive motor to said first lever arm,
said gear system and said first lever arm being structured and disposed
so that rotational movement of said drive motor is translated into
axial movement of said one of said at least one of said first and
second lens groups along said optical axis.
51. The focusing system of claim 50, further comprising a second
lever arm, said first and second lever arms being pivotally attached
to one another at a general central portion thereof so that said
first lever arm may pivot about said central portion.
52. A focusing system for a camera comprising:
an objective lens having an optical axis and at least one lens
group positioned along said optical axis;
a drive motor;
a first lever arm having an outer distal end secured to one of
said at least one lens group;
a gear system coupling said drive motor to said first lever arm,
said gear system and said first lever arm being structured and disposed
so that rotational movement of said drive motor is translated into
axial movement of said one of said at least one lens group along
said optical axis.
53. The focusing system of claim 52, further comprising a second
lever arm, said first and second lever arms being pivotally attached
to one another at a general central portion thereof so that said
first lever arm may pivot about said central portion.
54. The camera of claim 16, further comprising:
a cam gear;
a generally T-shaped lever having a generally centrally disposed
leg and a pair of arms, each of said arms extending out of opposite
sides of said leg in generally perpendicular relation thereto, said
leg being coupled to said cam gear and defining a cam follower;
a drive motor;
a gear system coupling said drive motor to said cam gear;
a first linkage coupled to a first one of said arms, said first
linkage being structured to move said first image direction diverting
device from said first diverting position to said second non-diverting
position;
a second linkage coupled to a second one of said arms, said second
linkage being structured to move said fourth image direction diverting
device from said first diverting position to said second non-diverting
position; and
wherein said cam gear and lever are structured and disposed so
that rotational movement of said drive motor is translated into
lateral movement of said arms from a first TTL mode position, wherein
said first image direction diverting structure is in said first
diverting position and said fourth image direction diverting structure
is in said second non-diverting position to a second review mode
position, wherein said first image direction diverting structure
is in said second non-diverting position and said fourth image direction
diverting structure is in said first diverting position.
55. The camera of claim 54, wherein said cam gear comprises a substantially
cylindrical-shaped body having a generally diagonally disposed channel
extending across an outer surface thereof, said channel being structured
and disposed to slidingly engage said cam follower.
56. The camera of claim 54, wherein said first linkage comprises
a first portion extending out from said arm in generally parallel
relation thereto and a second portion having a first end pivotally
attached to a distal end of said first portion, an opposite second
end structured to receive said first image directing diverting device
and a fixed pivot point proximate said first end.
57. The camera of claim 54, wherein said second linkage comprises
a first portion extending out from said arm in generally perpendicular
relation thereto and a second portion having a first end pivotally
attached to a distal end of said first portion, an opposite second
end structured to receive said fourth image directing diverting
device and a fixed pivot point proximate said first end.
58. A mirror drive assembly for an optical system switchable between
a TTL mode optical path wherein light is directed from an objective
lens to an eye lens, a picture taking mode optical path wherein
light is directed from the objective lens to an image sensing device,
and a review mode optical path wherein light is directed from a
display device to the eye lens, the mirror drive assembly comprising:
a first image direction diverting device structured for swinging
movement from a first diverting position, where it is in the TTL
mode optical path, to a second non-diverting position, where it
is out of the TTL mode optical path;
a second image direction diverting device structured for swinging
movement from a first diverting position, where it is in the review
mode optical path, to a second non-diverting position, where it
is out of the review mode optical path;
a cam gear;
a generally T-shaped lever having a generally centrally disposed
leg and a pair of arms, each of said arms extending out of opposite
sides of said leg in generally perpendicular relation thereto, said
leg being coupled to said cam gear and defining a cam follower;
a drive motor;
a gear system coupling said drive motor to said cam gear;
a first linkage coupled to a first one of said arms, said first
linkage being structured to move said first image direction diverting
device from said first diverting position to said second non-diverting
position;
a second linkage coupled to a second one of said arms, said second
linkage being structured to move said second image direction diverting
device from said first diverting position to said second non-diverting
position; and
wherein said cam gear and lever are structured and disposed so
that rotational movement of said drive motor is translated into
lateral movement of said arms from a first TTL mode position, wherein
said first image direction diverting structure is in said first
diverting position and said second image direction diverting structure
is in said second non-diverting position to a second review mode
position, wherein said first image direction diverting structure
is in said second non-diverting position and said second image direction
diverting structure is in said first diverting position.
59. The mirror drive assembly of claim 58, wherein said cam gear
comprises a substantially cylindrical-shaped body having a generally
diagonally disposed channel extending across an outer surface thereof,
said channel being structured and disposed to slidingly engage said
cam follower.
60. The camera of claim 58, wherein said first linkage comprises
a first portion extending out from said arm in generally parallel
relation thereto and a second portion having a first end pivotally
attached to a distal end of said first portion, an opposite second
end structured to receive said first image directing diverting device
and a fixed pivot point proximate said first end.
61. The camera of claim 58, wherein said second linkage comprises
a first portion extending out from said arm in generally perpendicular
relation thereto and a second portion having a first end pivotally
attached to a distal end of said first portion, an opposite second
end structured to receive said second image directing diverting
device and a fixed pivot point proximate said first end.
62. A camera comprising:
an objective lens structured to receive light from outside the
camera;
an image sensing device;
a display device;
an eye lens;
an optical system switchable between a picture taking mode optical
path wherein light is directed from said objective lens to said
image sensing device, and a viewing mode optical path wherein light
is directed from said display device to said eye lens; and
control means for switching said optical system between said picture
taking mode optical path and said viewing mode optical path.
63. The camera of claim 62, wherein said picture taking mode optical
path comprises an image direction diverting device structured and
disposed to direct light from said objective lens to said image
sensing device.
64. The camera of claim 2, wherein said second image direction
diverting device is movable from a first diverting position, wherein
it is in said TTL mode optical path and directs light from said
first image direction diverting device to said eye lens, to a second
non-diverting position, wherein it is out of said TTL mode optical
path and does not direct light from said first image direction diverting
device to said eye lens, wherein light is directed from said display
device to said eye lens when said second image directing diverting
device is in said second non-diverting position, movement of said
second image direction diverting structure being controlled and
driven by said control means.
Digital Camera Patent Description
FIELD OF THE INVENTION
The present invention relates to the field of digital cameras and,
more particularly, to a compact through-the-lens digital camera.
BACKGROUND OF THE INVENTION
The use of digital cameras has increased greatly over the past
few years and, with the advances in computer and related technologies
and the advent of the internet, is expected to increase even more
in the years to come. These days, digital cameras and the related
technologies not only allow image capture, storage, downloading
and manipulation, but also allow such images to be electronically,
and in some instances wirelessly, transmitted anywhere in the world.
The digital camera industry, like other technology industries,
is constantly striving to reduce the size of products, while maintaining
or increasing the product's functionality. However, prior art digital
cameras include certain inherent deficiencies, which hinder their
ability to become smaller. For instance, prior art digital cameras
utilize a liquid crystal display ("LCD") to frame the
image to be captured and to view the actual image captured. Of course,
the LCD must be large enough to enable the user to adequately view
the image being framed and captured. By employing a LCD for such
purposes, the camera must have a sufficiently large surface area
on which the LCD will be mounted. Thus, the LCD is a limiting factor
in the ability to reduce the size of the camera.
In addition to the size limitation issue, the use of LCDs in digital
cameras gives rise to several other problems. Specifically, LCDs
have relatively high power demands causing batteries to drain quickly.
Thus, it may be necessary for users to carry extra batteries with
them so that they may continue using the camera. Furthermore, employing
LCDs to frame an object, especially non-stationary objects, is somewhat
cumbersome because the camera must be held away from the user's
body some distance so that the user can view the LCD. Framing objects
in such a manner differs greatly from means traditionally employed
in non-digital cameras, that is, placing the user's eye up against
the viewfinder or ocular lens. Moreover, LCDs frequently experience
problems of washout or glare when they are used in bright ambient
conditions.
The above described problems also impact the camera design and
cost, by requiring a larger case, adequate gripping means to hold
the camera away from the user's body, anti-glare means, and circuitry
to provide the necessary power to the LCD. Additionally, the ability
to create innovative and aesthetically pleasing external designs
is limited by the need to provide a sufficiently large and flat
surface area to accommodate the LCD. Without the ability to create
such innovative designs, certain market segments may be unattainable.
Many prior art digital cameras also utilize removable memory disks
or cards to store captured images. Such disks also impact the camera's
size and configuration. Moreover, these external disks are relatively
expensive and, depending upon the number of images to be captured,
may require the user to carry one or more additional disks separate
from the camera, thereby making transportability more difficult
and creating the possibility of losing the disks, as well as any
images recorded thereon.
Accordingly, there is a need in the art for a new and improved
digital camera, which does not employ a LCD for image framing and
capture and does not require an external memory, thereby minimizing
the overall camera size, allowing for greater creativity in camera
packaging and improving transportability. Any such camera should
have relatively low power consumption requirements, thereby improving
battery life over prior art digital cameras. Additionally, any such
camera should be compact, lightweight and inexpensive. The present
invention is particularly suited to overcome those problems which
remain in the art in a manner not previously known.
SUMMARY OF THE INVENTION
The present invention is directed to a new and improved compact
through-the-lens digital camera comprising an objective lens unit,
an image sensing device, an internal display device, an eye lens
unit, an optical system, control and processing circuitry, function
select controls, and an external interface. The optical system is
switchable between an image framing mode optical path, wherein light
is directed from the objective lens unit to the eye lens unit, an
image capture mode optical path, wherein light is directed from
the objective lens unit to the image sensing device, and an image
review mode optical path, wherein light is directed from the display
device to the eye lens unit. The control and processing circuitry
switches the optical system between the image framing mode optical
path, the image capture mode optical path and the image review mode
optical path and controls the image capture, processing, storage
and display on the display device, the operation of the zoom and
auto focus functions and function select controls and external communication
through the external interface.
It is an object of the present invention to provide a new and improved
digital camera which has all the advantages of the prior art devices
and none of the disadvantages.
It is another object of the present invention to provide such a
camera which is compact and lightweight.
It is also an object of the present invention to provide such a
camera which allows for greater creativity in camera packaging.
It is yet another object of the present invention to provide such
a camera which has relatively low power consumption requirements,
thereby improving battery life over prior art digital cameras.
It is a further object of the present invention to provide such
a camera which does not employ a LCD for image framing and capture.
It is yet a further object of the present invention to provide
such a camera which does not require an external memory, thereby
improving transportability over prior art digital cameras.
It is another object of the present invention to provide such a
camera which does not employ helicoid barrels or stepper motors
in the zoom and auto focus mechanisms.
These and other objects and advantages of the present invention
will become more readily apparent in the description which follows.
BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing summary, as well as the following detailed description
of the preferred embodiments, is better understood when read in
conjunction with the appended drawings. For the purpose of illustrating
the invention, there is shown in the drawings an exemplary embodiment
that is presently preferred, it being understood, however, that
the invention is not limited to the specific methods and instrumentality's
disclosed. In the drawings:
FIG. 1 shows a perspective view from the front, right side of an
exemplary compact through-the-lens digital camera of the present
invention;
FIG. 2 shows a perspective view from the left side of the digital
camera of FIG. 1, with the battery compartment and external interface
cavity doors open;
FIG. 3 shows a perspective view from the rear, left side of the
digital camera of FIG. 1;
FIG. 4 shows an exemplary optical layout of the image framing mode
optical path;
FIG. 5 shows an exemplary optical layout of the image review mode
optical path;
FIG. 6 shows an exemplary optical layout of the image capture mode
optical path;
FIG. 7 shows a perspective view of the mirror drive sub-assembly
of the digital camera of the present invention in the image framing
mode;
FIG. 8 shows a perspective view of the mirror drive sub-assembly
of the digital camera in the image review mode;
FIG. 9 shows a perspective view of the zoom and auto focus mechanisms
of the digital camera of the present invention;
FIG. 10 shows a perspective view of the zoom and auto focus mechanisms
of the digital camera of FIG. 9 with the first and second lens groups
removed for clarity;
FIG. 11 shows a reverse perspective view of the zoom and auto focus
mechanisms of the digital camera of FIG. 10;
FIG. 12 shows a reverse perspective view of the zoom and auto focus
mechanisms of the digital camera of FIG. 10, with the front portion
of the bracket removed for clarity;
FIG. 13 shows a perspective view of the digital camera of FIG.
1, with the top half removed.
FIG. 14 shows a perspective view of an exemplary PCB showing the
display device and the control and processing circuitry.
FIG. 15 shows a top plan view of an alternate mirror drive mechanism
embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Before explaining the disclosed embodiment of the present invention
in detail, it is to be understood that the invention is not limited
in its application to the details of the particular arrangement
shown since the invention is capable of other embodiments. Also,
the terminology used herein is for the purpose of description and
not of limitation.
As shown in FIGS. 1-15, the present invention is directed towards
a new and improved compact through-the-lens digital camera 1 comprising
an objective lens unit 10, an image sensing device 20, a display
device 30, an eye lens unit 40, an optical system, control and processing
circuitry 60, function select controls 70, and an external interface
90. The optical system is switchable between an image framing mode
optical path 52, wherein light is directed from the objective lens
unit 10 to the eye lens unit 40, an image capture mode optical path
54, wherein light is directed from the objective lens unit 10 to
the image sensing device 20, and an image review mode optical path
56, wherein light is directed from the display device 30 to the
eye lens unit 40. The control and processing circuitry 60 switches
the optical system between the image framing mode optical path 52,
the image capture mode optical path 54 and the image review mode
optical path 56 and controls the image capture, storage and display
on the display device 30 and the operation of the zoom and auto
focus functions.
Housing
The camera 1 includes a generally rectangular-shaped housing 2
having an envelope with a length X defined by the distance between
the right sidewall 15 and the left sidewall 16, a width Y defined
by the distance between the front face 13 and the rear face 14,
and a height Z defined by the distance between the top face 11c
and the bottom face 12c. In the preferred embodiment, the length
X is greater than the width Y, and the width Y is greater than the
height Z, resulting in a relatively low profile when compared to
conventional digital cameras. As discussed further below, during
normal operation, the camera 1 is disposed so that the image framing
mode optical path 52 and the image review mode optical path 56 are
in a single horizontal plane defined by the length X and width Y.
The layout of the optical system in the manner disclosed by the
present invention enables the camera 1 to provide a relatively long
focal length, while still maintaining the relatively compact envelope.
The housing 2 includes a top half 11 and a bottom half 12. The
top half 11 and the bottom half 12 are made as two separate pieces
to facilitate manufacturing of the housing 2 and also to facilitate
the provision of a multi-colored housing 2. It should be appreciated,
however, that the housing 2 may, alternatively, be comprised of
any number of pieces.
The outer surfaces of the top 11 and bottom 12 halves may be contoured,
if desired, to improve gripping capabilities and provide a more
ergonomic and aesthetically pleasing design. For instance, in the
preferred embodiment, the top half 11 includes a raised cylindrical
portion 36, having a height greater than the height Z of the remainder
of the housing 2, formed along the right side 15 of the housing
2. The raised portion 36 is structured to enclose the objective
lens unit 10, thereby minimizing the required envelope size of the
housing 2. In addition, the raised portion 36 forms a gripping structure
to facilitate the holding of the camera 1.
The top half 11 is adapted for connective engagement with the corresponding
bottom half 12 using conventional fastening means. The downwardly
extending sections from the top half 11 and the corresponding upwardly
extending sections from the bottom half 12 are structured to align
with one another to form a substantially light tight connection
when assembled together. In the preferred embodiment, the housing
2 is constructed of a light-weight, yet rugged plastic material,
but may, alternatively, be constructed of an alloy material, a metallic
material or any other suitable material.
The top and bottom halves 11, 12 include a plurality of openings
integrally formed therein. The openings are structured and disposed
to allow access to the objective lens unit 10, eye lens unit 40,
function select controls 70 and external connector 90. One or more
recesses 50 may also be provided to accommodate a strap.
The openings include an objective aperture 28 formed in a front
face 13 of the housing 2 proximate the right side 15 of the housing
2. The objective aperture 28 is disposed within the objective lens
unit 10 optical axis and is adapted for receiving and holding an
objective lens cover 31. The objective lens cover 31 may be formed
of a transparent material such as glass or plastic and may include
an opaque portion disposed about its outer perimeter to provide
some undesired light shielding capabilities. The objective aperture
28 preferably has a circular shape with a diameter less than the
thickness or height Z of the housing 2.
The front face 13 of the housing 2 also includes a flash window
opening 29 formed therein proximate the left side 16 of the housing
2. This flash opening 29 is adapted for receiving and accommodating
an electronic flash device. The flash opening 29 is preferably formed
having a rectangular shape, but may, alternatively, be of any other
desired shape.
The front face 13 also includes a self-timer indicator window opening
30 formed therein for accommodating an indicating device for a self-timer.
The indicating device may be an LED or any other suitable device
known in the art.
An eye lens aperture 33 is integrally formed in the rear face 14
of the housing 2 proximate the side of the housing opposite the
objective lens aperture 28. The eye lens aperture 33 is disposed
within the eye lens 40 optical axis and is adapted for receiving
and holding an eye lens cover 34. The eye lens cover 34 is formed
of a transparent material such as glass or plastic. The eye lens
aperture 33 preferably has a substantially circular shape having
a diameter less than the thickness or height Z of the camera housing
2.
A diopter adjustment ring 35 is formed about the outer circumference
of the eye lens aperture 33 so that the position of eye lens 40
may be adjusted along the eye lens optical axis to accommodate individual
vision capabilities. The ring 35 further acts as a hood to reduce
the effects of glare.
A battery compartment 37 is integrally formed in the left sidewall
16 of the camera housing 2. The battery compartment 37 includes
one or more contact terminals 40 disposed therein for forming an
electrical connection between the batteries and the cameras internal
electrical circuitry. A battery compartment door 38, shaped to conform
to the exterior shape of the camera housing 2, is hingedly attached
to the housing 2 and structured for swinging movement from an open
position, wherein the battery compartment 37 is accessible, to a
closed position, wherein the battery compartment 37, and any batteries
seated therein, are enclosed.
An external interface cavity 41 is also integrally formed in the
left sidewall 16 of the camera housing 2, adjacent the battery compartment
37. An external interface 90 is disposed within the external interface
cavity 41 for interconnection with an external device, such as a
computer, printer, television or video monitor, imaging device,
etc.
Optical System
The optical paths of the various modes of the optical system comprise
a plurality of related portions. The image framing mode optical
path 52 comprises a first portion 97 defined by the objective lens
10 optical axis, a second portion 98 in substantially perpendicular
relation to the first portion 97 and a third portion 99, defined
by the eye lens 40 optical axis, parallel to and in the same direction
as the first portion 97. In the preferred embodiment, the first
97, second 98 and third 99 portions of the image framing mode optical
path 52 are disposed within a single horizontal plane defined by
the length X and width Y of the housing 2.
A plurality of fixed and moveable mirrors are utilized to divert
light from one portion to another. A first mirror 51 is positioned
between the first 97 and second 98 portions and is structured for
swinging movement between a first diverting position, wherein it
diverts light from the first portion 97 to the second portion 98,
and a second non-diverting position, wherein it does not divert
light from the first portion 97. A second mirror 53 is positioned
between the second 98 and third 99 portions and is structured to
divert light from the second portion 98 to the third portion 99.
By orienting the first 51, second 53 and fourth 57 mirrors in the
camera housing 10 in a horizontal, periscope-like manner, the image
observed by the user is not inverted. The first mirror 51 is preferably
structured to allow a portion of the light from the objective lens
unit 10 to pass therethrough or thereby, so that during the image
framing mode, a portion of the light is received by the image sensing
device 20 for focusing.
The image capture mode optical path 54 comprises the first portion
97 and a fourth portion 96 in substantially perpendicular relation
to the first portion 97. The fourth portion 96 is disposed in a
vertical plane defined by the height Z. A third mirror 55 is positioned
along the first portion 97, behind the first mirror 51, and is structured
to divert light from the first portion 97 to the fourth portion
96. By arranging the image capture mode optical path 54 in this
manner, the image sensing device 20 is not positioned within the
plane defined by the height Z, thereby allowing the height Z of
the camera to be minimized. That is, the height Z of the camera
1 is not driven by the size of the image sensing device 20.
The image review mode optical path 56 is comprised of the second
portion 98 and the third portion 99, which, as stated above, are
disposed within a single horizontal plane defined by the length
X and width Y of the housing 2. A fourth mirror 57 is structured
for swinging movement between a first diverting position, wherein
it is positioned within the second portion 98 and diverts light
from the display device 30 to the second portion 98, and a second
non-diverting position, wherein it is out of the second portion
98 and does not divert light from the display device 30 to the second
portion 98.
In the preferred embodiment, the first 51 and fourth 57 mirrors
move in unison with one another so that:
1. in the image framing mode, when the first mirror 51 is in its
first diverting position, the fourth mirror 57 is in its second
non-diverting position, thereby directing the light entering the
objective lens unit 10 to the eye lens unit 40; and
2. in the image review mode, when the first mirror 51 is in its
second non-diverting position, the fourth mirror 57 is in its first
diverting position, thereby directing the light from the display
device 30 to the eye lens unit 40.
It should be appreciated that the first 51 and fourth 57 mirrors
do not necessarily have to move together. Moreover, movement of
the moveable mirrors in the optical system may be accomplished by
rotating, sliding or any other means known in the art. Also, the
first mirror 51 may, alternatively, be stationary and structured
to divert only a portion of the light from the objective lens 10,
while allowing the remaining portion of the light to pass therethrough
to the image sensing device 20.
In an alternate preferred embodiment of the present invention 1,
the optical system may only comprise an image capture mode optical
path and an image review mode optical path. In this alternative
embodiment, there is no first mirror 51 and the image entering the
objective lens unit 10 is directed to the image sensing device 20.
The fourth mirror 57 is then fixed in its first diverting position
within the second portion 98 so that the user may frame and review
the image via the display device 30. In this embodiment, no movable
mirrors are employed.
In a preferred embodiment, the movable mirrors 51, 57 move together,
in a coordinated manner, by a single motor M1 and drive mechanism.
The output from the motor M1 is transmitted through the drive mechanism
106, which includes a series of gears 106a and mechanical linkages
106b, to move the two mirrors 51, 57 together. The last gear from
the motor M1 output shaft 107 is a cam gear 108 that is connected
to a generally T-shaped walker or rocking lever 109.
A cam follower 100 is formed on the central leg of the lever 109
and slidably engages a camed surface 111 of the cam gear 108. A
first arm 109a of the lever 109 is mechanically connected to a first
mirror holder 51a and the second opposite arm 109b is mechanically
attached to the fourth mirror holder 57a. The cam gear 108 and lever
109 are structured and disposed so that rotational movement of the
motor M1 is translated into lateral movement of the first 109a and
second 109b arms from a first image framing mode position, wherein
the first mirror 51 is in its first diverting position and the fourth
mirror 57 is in its second non-diverting position to a second image
review mode position, wherein the first mirror 51 is in its second
non-diverting position and the second mirror 57 is in its first
diverting position. The entire mirror moving mechanism 106 is connected
to and supported by a cover bracket assembly 110.
The cam gear 108 comprises a substantially cylindrical-shaped body
108a having a generally diagonally disposed channel 108b extending
across its outer surface thereof. The channel 108b is structured
and disposed to slidingly engage the cam follower 100.
The mechanical linkages 106 comprise a first portion 126 extending
out from the first 109a and second 109b arms in generally parallel
relation thereto and a second portion 127 having a first end 127a
pivotally attached to a distal end of the first portion 126, an
opposite second end 127b structured to receive the mirrors 51, 57
and a fixed pivot point proximate the first end 127a.
A bias mechanism (not shown), such as a spring, can be provided
to account for slight over travel of the lever 109 without damaging
the mirrors 51, 57 on stops 112 provided on the mirror drive brackets
51b, 57b proximate each mirror holder 51a, 57a. Several safety features
may be provided to prevent damage to the mirrors 51, 57 including
fingers on the mirror drive cover bracket to limit the rotation
of the cam gear 108 and a cut off switch to stall the motor M1 if
the cam gear 108 over rotates.
It should be appreciated that other means of moving the mirrors
may, alternatively, be employed. For instance, in an alternate preferred
embodiment shown in FIG. 15, a solenoid driven mechanism 300 is
utilized. The solenoid driven mechanism 300 comprises a solenoid
302 coupled to a lever 304, which drives a ratchet-type structure
305. As the solenoid 302 core 303 moves out of the solenoid 302
body, the lever 304 rotates, which, rotates the ratchet-type structure
305. The ratchet-type structure 305, in turn, acts like a sprocket
to push the bar 306 in alternating directions. A pair of half over-the-center
springs 307 combine to simulate a full over-the-center spring, which
are structured to further propel the ratchet-type structure 305
and bar 306. A spring (not shown) returns the solenoid lever to
its start position. The ratchet-type structure 305 rotates clockwise
as the solenoid lever reloads. Subsequent solenoid 302 pulses toggle
the mirror position. This structure allows a single direction solenoid
to produce a multi-direction output.
The through-the-lens viewfinder structure of the present invention
allows for easy framing of the image and prevents the problem of
mis-framing. As the user views the scene and frames the image to
be captured, the user sees exactly what the camera sees, thereby
avoiding the "cutting off the head" problem commonly associated
with non-through-the-lens systems. Real time through-the-lens viewing
also eliminates problems associated with external LCDs, such as
the washout problem in bright ambient conditions and the difficulty
of trying to frame the image at arm's length. Moreover, the through-the-lens
viewfinder reduces the power drain associated with conventional
LCDs. It should be appreciated that the movable mirrors 51, 57 may,
alternatively, have their own independent drive mechanisms (not
shown) and may move separate from one another.
Zoom Mechanism
In the preferred embodiment, the objective lens unit 10 is a zooming
mechanism comprising a first lens group 201 and a second lens group
202. The first 201 and second 202 lens groups are each disposed
within separate, substantially circular units or cells and are positioned
within a cylindrical-shaped zoom barrel 203. The first lens group
201 is disposed within the zoom barrel 203 proximate the objective
aperture 28 and the second lens group 202 is disposed within the
zoom barrel 203 to the rear of the first lens group 201.
The first 201 and second 202 lens groups each include a lower guide
pin 204 and an upper projection 206, having a longitudinally disposed
bore 207 extending therethrough, projecting out from opposite outer
surfaces thereof. The guide pins 204 are structured to slide within
a longitudinally disposed channel (not shown) in the zoom barrel
203. The bores 207 are structured for sliding engagement about a
guide rod (not shown) disposed longitudinally above an upper portion
of the zoom barrel 203. The guide pins 204, channels, bores 207
and guide prevent the first 201 and second 202 lens groups from
rotating within the zoom barrel 203. It should be appreciated that
other means may, alternatively, be employed to accomplish this purpose.
In the preferred embodiment, the first 201 and second 202 lens
groups are moved in a coordinated manner within the zoom barrel
203 by a single motor M2 during zooming. It should be appreciated,
however, that movement of the first 201 and second 202 lens groups
could, alternatively, be accomplished with separate motors driving
each group. The output of the motor M2 is transmitted through a
first gear system 229 to a generally triangular-shaped cam gear
210. The cam gear 210 includes a generally centrally disposed gear
slot 211 structured for mating engagement with a gear from the first
gear system 229. A coupling pin 212 projects out from the upper
distal end 213 of the cam gear 210 and is structured for mating
engagement with a slot 214 in the upper projection 206 of the second
lens group 202. During operation, the motor M2 drives the gears
within the first gear system 229 to rotate. Rotation of the gear
within the cam gear 210 gear slot 211 causes the second lens group
202, via the coupling pin 212, to move axially within the zoom barrel
203.
The cam gear 210 further includes a forwardly disposed, downward
sloping outer cam surface 220. A first generally L-shaped lever
arm 221 has a lower end pivotally mounted within the housing 2 and
an opposite free end 222 defining a cam follower. The first lever
arm 221 is structured to pivot about its lower pivot point as the
free end 222 slidingly engages the cam surface 220.
A second lever arm 224 is pivotally attached to the first lever
arm 221 at a generally centrally disposed portion. A coupling pin
225 projects out from the upper end of the second lever arm 224
and is structured for mating engagement with a slot 226 in the upper
projection 206 of the first lens group 201. During zooming operation,
as the cam gear 210 moves laterally, causing the second lens group
202 to move axially within the zoom barrel 203, the free end 222
of the first lever arm 221 slides up and down the cam surface 220,
causing the upper end of the second lever arm 224 to move in a substantially
lateral direction and the first lens group 201, via the coupling
pin 225, to move axially within the zoom barrel 203.
The first lens group 201 travels in a substantially sine-curve
like motion (e.g., toward the rear 14 of the camera 1 and then back
out toward the front 13) from a wide position, through a normal
position, to a telescopic position, while at the same time, the
second lens group 202 moves in a substantially linear-like motion
(e.g., from the rear 14 of the camera 1 toward the front 13) from
a wide position, through a normal position, and to a telescopic
position.
Auto Focus Mechanism
The auto focus system comprises a motor M3 and a second gear system
230 coupled to the motor M3. The output of the motor M3 is transmitted
through the second gear system 230 to a cam gear 231. The lower
end 232 of the second lever arm 224, defining a cam follower, slidingly
engages a cam surface 233 on the cam gear 231. As described above,
the coupling pin 225 on the upper end 229 of the second lever arm
224 as attached to the upper projection 206 of the first lens group
201. Through this structure, rotational movement of the motor M3
is translated into axial movement of the first lens group 201 within
the zoom barrel 203.
The auto focus system operates by sampling the incoming light at
a predetermined interval through one revolution of the cam gear
231. The control and processing circuitry 60 processes the information
and determines the preferred setting. The auto focus system then
runs through a second until it reaches the preferred setting.
The auto focus system may be activated when the camera 1 is powered
on or alternatively, to conserve power, when the trigger button
17 is touched or the eye lens 40 is covered. In the preferred embodiment,
the first mirror 51 is a partially reflective mirror that allows
a portion of the light to pass therethrough, while the remaining
portion is reflected towards the second mirror 53 when the first
mirror 51 is in its first diverting position. The portion of the
light passing through the first mirror 51 is directed by the third
mirror 55 to the image sensing device 20, where it is processed
as described above.
The zoom and auto focus mechanisms of the present invention offer
several improvements over prior art structures. Specifically, no
expensive helicoid barrels or stepper motors are employed. Also,
the zooming and auto focus functions are arranged in a single plane,
cam and lever mechanism with a differential lever providing the
auto focus movement. Additionally, the axis for the zoom M2 and
auto focus M3 motors, as well as the gears in the first and second
gear systems are parallel for easy tooling and assembly. Also, the
zoom and auto focus drive mechanisms, i.e., the motors M2, M3, the
first 229 and second 230 gear systems and the cam gears 210, 231
and first 221 and second 224 lever arms are arranged on a mounting
bracket 250, which facilitates manufacture, assembly and repair
of the mechanisms.
Image Sensing Device
The image sensing device 20 may be a charge-coupled device (CCD),
a CMOS device, or any other suitable device known in the art. Similarly,
the resolution of the image sensing device 20 may be selected to
accommodate the users needs. The image sensing device 20 may also
be structured to operate in various different image quality modes,
enabling the user to store a fewer number of high resolution images,
a greater number of lower resolution images in memory or a combination
thereof.
Display Device
In the preferred embodiment, the display device 30 is a color micro
display mounted inside the housing 2. Alternatively, a mono-chrome
display may be used. By employing an internal micro display in the
manner contemplated by the present invention, the camera size may
be reduced from those employing LCDs for framing and reviewing images.
Magnification of the micro display image is accomplished by the
optics within the optical system. Moreover, the internal display
device 30 minimizes image "wash-out" in bright daylight
and utilizes relatively low power compared to external LCDs, prolonging
battery life.
It should be noted that the position of the display device 30 within
the housing may vary. For example, the display device 30 may be
positioned directly behind the second mirror 53, within the eye
lens 40 optical axis, such that if the mirror 53 was movable out
of the path between the display device 30 and the eye lens 40, an
image from the display device 30 could be viewed from the eye lens
40 without the need for the fourth mirror 57.
Flash Device
The digital camera 1 also includes a flash device to allow the
user to take pictures when the available light is dim or non-existent.
The flash device is disposed on the front panel 13 of the camera
1 and is contained in the flash window opening 29. A flash PCB and
a flash capacitor 51 interface with the control and processing circuitry
60 to control the flash device. The flash device may be an automatic
electronic sensor flash that automatically turns on and off as needed
or may be manually activated to fill in dark shadows during sunny
conditions.
Control and Processing Circuitry
The control and processing circuitry 60 comprises a microprocessor,
an imaging ASIC and static and dynamic random access memory ("RAM").
These electronic components are supported on one or more printed
circuit boards, electrically interconnected to the other functional
elements in the camera 1, such as, the motors M1, M2, M3, the image
sensing device 20, the display device 30, the function select controls
70 and the external interface 90.
The ASIC is structured to perform the desired image processing
functions including, but not limited to:
1. Demosaic;
2. Color correction, compensation and other image quality improvements;
3. Low pass filtering and digital automatic gain control;
4. Signal knee operations to manipulate maximum and minimum signal
thresholds;
5. Sharpening to compensate for optical low pass filtering, auto
exposure, auto focus, and auto white balance measurement algorithms;
6. Gamma Correction; and
7. Image compression.
The operation of the camera 1 is controlled by the firmware. In
the preferred embodiment, the firmware controls image capture, image
processing, image storage in the static RAM, image display of the
display device 30, USB communication, the mirror M1, zoom M2 and
auto focus M3 motors, the function select controls, the status display,
the flash, voltage regulation, and any other desired functions.
The firmware may also include certain "underware" commands
to perform special functions as directed by a host computer. Such
special functions may include direct control of certain camera functions,
specific testing modes, and operation logging capabilities.
Function Select Controls
The function select controls 70 comprise a number of user select
buttons 72 and a status LCD 73 mounted on the top face 11c of the
housing 2. The number and orientation of the user select buttons
72 may vary to accommodate the particular camera 1 layout. Similarly,
the functions provided may vary. Typical function selects include,
on/off, image capture, image review, zoom in, zoom out, flash activation,
timer on/off, image quality. Additionally, the status LCD 73 may
provide a variety of desired information including flash status,
image quality, timer indication, battery status, date, number of
remaining pictures, mode indicator, etc. Using the user select buttons
72, the user may scroll between the various options and control
the camera 1 operation.
External Interface
The external interface 90 allows for interconnection to other electronic
devices for image downloading, printing or other data transfer.
This may be accomplished using any conventional connectivity means,
including a serial port, a parallel port, a Universal Serial Bus
(USB), an infrared wireless connection, Bluetooth, etc.
In the preferred embodiment, the USB standard is employed to link
the digital camera 1 to any USB equipped computer, printer, or imaging
device (not shown). The USB cord should be capable of transmitting
signals and data from the camera 1, as well as providing power to
and possibly control over the digital camera 1. The download may
be made to a computer, an imaging device, a scanner device, or alternatively,
directly to a printer device.
An optional video output connection (not shown) may also be provided
in the digital camera housing 10. This analog video output terminal,
such as NTSC or PAL, allows the digital camera 1 to be connected
to a TV that is equipped with a standard input or video-in terminal.
This allows the images to be previewed or shared with others.
It is contemplated that certain aspects of the invention may be
applicable to other types of digital imaging systems as well, including
image scanning, image storage, and image printing devices, and is
not limited to the particular digital camera embodiment shown. In
addition, the invention contemplates the use of certain aspects
of the invention in other camera types, and the use of other camera
structures, various envelopes for packaging the camera hardware,
different methods of assembling various parts of the camera together,
and the use of various materials for the construction of the digital
camera and its components.
Submitted simultaneously herewith is commonly-assigned U.S. patent
application Ser. No. 09/494,320, entitled "Optical Systems
for Digital Cameras", which describes optical systems with
which the camera structures of this invention may be used. In particular,
the optical paths of FIGS. 4-6 were designed to incorporate features
of this commonly-assigned application, the content of which in its
entirety is incorporated herein by reference.
While the invention has been described with reference to a preferred
embodiment, it will be understood by those skilled in the art that
various changes may be made and equivalents may be substituted for
elements thereof without departing from the scope of the invention.
In addition, many modifications can be made to adapt a particular
situation or material to the teachings of the invention without
departing from the essential scope thereof. Therefore, it is intended
that the invention not be limited to the particular embodiment disclosed
as the best mode contemplated for carrying out this invention, but
that the invention will include all embodiments falling within the
scope of the appended claims.
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