Digital Camera Patent Abstract
A digital camera comprises an electronic view finder (EVF) for electronically
displaying an image of a subject and a movable monitor. The movable
monitor is slidable along guide grooves and movable between a first
position in which the EVF is covered with the movable monitor and
a second position in which the EVF is not covered. By a sensor for
position detection, when it is detected that the movable monitor
is in the first position, no image is displayed on the EVF but an
image is displayed on the movable monitor. When it is detected that
the movable monitor is in the second position, no image is displayed
on the movable monitor but an image is displayed on the EVF. Consequently,
power can be saved, and when the movable monitor is in the first
position, adhesion of dusts and dirt onto the display face of the
EVF can be decreased. Digital Camera Patent Claims
What is claimed is:
1. A digital camera comprising:
(a) a first display unit capable of electronically displaying an
image;
(b) a second display unit capable of electronically displaying
an image and movable among a plurality of positions including a
first position in which at least a part of a display face of said
first display unit is covered with said second display unit and
a second position in which the display face of said first display
unit is not covered with said second display unit; and
(c) a display controller which performs a first control of making
said first display unit incapable of displaying an image when said
second display unit is in said first position, and a second control
of making said first display unit capable of displaying an image
when said second display unit is in said second position.
2. The digital camera according to claim 1, wherein said second
control is a control of selectively making said first display unit
and said second display unit activated when said second display
unit is in said second position.
3. The digital camera according to claim 1, wherein said display
controller comprises:
(c-1) a detecting element for detecting the position of said second
display unit; and
(c-2) a switching element for switching said first control and
said second control in accordance with whether said second display
unit is in said first position or said second position.
4. The digital camera according to claim 1, wherein said second
display unit is slidably movable between said first position and
said second position, and
the display face of said second display unit is exposed in both
said first position and said second position.
5. The digital camera according to claim 1, wherein said second
display unit is swingable between said first position and said second
position.
6. The digital camera according to claim 5, wherein the display
face of said second display unit faces the display face of said
first display unit in said first position, and
the display face of said second display unit is exposed to the
outside in said second position.
7. The digital camera according to claim 6, wherein said second
display unit is larger than said first display unit and
the display face of said first display unit is almost completely
covered with said second display unit in said first position.
8. The digital camera according to claim 5, wherein the display
face of said second display unit is exposed in said first position,
and
the display face of said second display unit closely faces the
camera body in said second position.
9. The digital camera according to claim 1, wherein said display
controller further comprises:
(c-3) an operation input device for receiving an operation input
for selecting either said first display unit or said second display
unit to display a real-time image of a subject in said second position.
10. The digital camera according to claim 1, wherein said second
display unit is larger than said first display unit and
the display face of said first display unit is almost completely
covered with said second display unit in said first position.
11. A method of controlling display of a digital camera comprising
a first display unit and a second display unit which is movable
between a first position in which said first display unit is covered
with said second display unit and a second position in which said
first display unit is not covered with said second display unit,
the method comprising the steps of:
detecting a position of said second display unit; and
making said first display unit incapable of displaying an image
when said second display unit is in the first position.
12. The method according to claim 11, wherein when said second
display unit is in the second position, a captured image is displayed
on said first display unit.
13. The method according to claim 11, further comprising the steps
of:
detecting a setting state by a designating device for designating
a display unit; and
displaying a captured image on the display unit designated by said
designating device when said second display is in the second position.
Digital Camera Patent Description
This application is based on application No. 11-304210 filed in
Japan, the contents of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a digital camera and, more particularly,
to a digital camera having two display units capable of electronically
displaying an image, for example, an electronic view finder and
a monitor.
2. Description of the Background Art
Hitherto, a digital camera is known, which has two display units
each capable of electronically displaying an image, such as an electronic
view finder for electronically displaying an image of a subject
in a real time manner in an image capturing mode, and a monitor
for electronically displaying an image of the subject at the time
of or after capturing the image.
In some digital cameras, only one of the electronic view finder
and the monitor, which is selected at the time point is allowed
to display a real-time image of the subject in the image capturing
mode. The reasons why only one of the two electronic image display
units is allowed to display an image are as follows.
(1) When both of the electronic image display units are allowed
to display an image, the power consumption is high.
(2) The user hardly looks images simultaneously on the monitor
and the electronic view finder. Even in the case where the user
checks images of a subject on both units, the user usually looks
the images on the electronic view finder and the monitor alternately.
Consequently, there is not much merit in allowing both units to
display images simultaneously.
On the other hand, a digital camera capable of housing a monitor
which is movable in a housing position in the camera body is known.
In the digital camera, when the monitor is housed, only an electronic
view finder is used. When the monitor is not housed, both the electronic
view finder and the monitor can be used for displaying images, and
it is also possible to allow only the monitor to display an image.
In the former case, however, there is not much merit in allowing
both of the two display units to display images as described above,
and the power consumption is high.
In the latter case, although the power consumption is not a problem,
even when an image is displayed only on the monitor, the user instinctively
looks through the electronic view finder. This happens because of
a subconscious awareness such that the user can always look a real-time
image of a subject through a finder due to a habit formed in an
optical finder. The following is also connected. In the case of
the electronic view finder, different from the monitor, the user
cannot check whether an image is displayed or not without actually
looking the image through the finder.
As described above, such a conventional digital camera of a movable
monitor type has a problem such that it is not constructed so as
to produce a technical synergistic effect between the fact that
the monitor is movable and the fact that the two display units are
selectively used and allowed to display an image in order to save
consumption power.
SUMMARY OF THE INVENTION
The present invention is directed to a digital camera.
According to the present invention, this digital camera comprises:
a first display unit capable of electronically displaying an image;
a second display unit capable of electronically displaying an image
and movable among a plurality of positions including a first position
in which at least a part of a display face of the first display
unit is covered with the second display unit and a second position
in which the display face of the first display unit is not covered
with the second display unit; and a display controller which performs
a first control of making the first display unit incapable of displaying
an image when the second display unit is in the first position,
and a second control of making the first display unit capable of
displaying an image when the second display unit is in the second
position.
By making the first display unit incapable of displaying an image
when the second display unit is in the first position in which at
least a part of the display face of the first display unit is covered
with the second display unit, a power-thrifty digital camera is
realized.
When the second display unit is in the first position, the display
face of the first display unit is at least partly covered with the
second display unit. Consequently, the user can easily understand
that the first display unit is not used to display an image at the
time point. The user does not therefore looks into the first display
unit on which no image is displayed.
Further, in a state such that the digital camera is not in use,
by setting the second display unit in the first position, effects
such that adhesion of dusts and dirt onto the display face of the
first display unit is decreased and the display performance is therefore
maintained are produced.
In a preferred embodiment of the present invention, in the digital
camera, the second control is a control of selectively making the
first and second display units activated when the second display
unit is in the second position. Since both of the display units
are not made activated simultaneously when the second display unit
is in the second position, it is particularly power thrifty.
In another aspect of the present invention, in the digital camera,
the display controller comprises: a detecting element for detecting
the position of the second display unit; and a switching element
for switching the first control and the second control in accordance
with whether the second display unit is in the first position or
the second position. By the switching between the first and second
controls, the operation of making the display unit incapable of
displaying an image is automatically performed in association with
the movement of the second display unit between the positions. The
user therefore does not have to switch the control between the first
and second controls.
The present invention is also directed to a method of controlling
display of a digital camera comprising a first display unit and
a second display unit which is movable between a first position
in which the first display unit is covered with the second display
unit and a second position in which the first display unit is not
covered with the second display unit.
The "display face" in the present invention denotes an
open face by which the user can look a displayed image and which
can be brought physically close to the display image. For example,
a display face in an electronic view finder corresponds to the face
of an eyepiece of the electronic view finder.
It is therefore an object of the present invention to obtain a
digital camera of a type that one of two electronic display units
is operative, which achieves lower power consumption while ergonomically
effectively utilizing the movability of one of the display units.
Another object of the present invention is to achieve both an ergonomic
design and lower power consumption and make the most of the movability
of one of the display units so as to produce other effects such
as maintenance of the performance of the digital camera.
These and other objects, features, aspects and advantages of the
present invention will become more apparent from the following detailed
description of the present invention when taken in conjunction with
the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view showing the configuration of the main
portion of a digital camera 1A according to a first embodiment of
the invention.
FIG. 2 is a perspective view showing the configuration of the main
portion of the digital camera 1A.
FIG. 3 is a perspective view showing the configuration of the main
portion of the digital camera 1A.
FIG. 4 is a block diagram showing the functional configuration
of the digital camera 1A.
FIGS. 5A and 5B show that a movable monitor 22A is in a second
position.
FIG. 6 is a flowchart for explaining the operation of displaying
an image of a subject.
FIG. 7 is a perspective view showing the back face of a digital
camera 1B according to a second embodiment.
FIG. 8 shows that a movable monitor 22B is in a second position.
FIGS. 9A and 9B are diagrams for explaining a swinging mechanism
of the movable monitor 22B.
FIG. 10 is a block diagram showing a functional configuration of
the digital camera 1B.
FIG. 11 is a flowchart for explaining the operation of displaying
an image of a subject.
FIG. 12 shows that the movable monitor 22A according to a third
embodiment is in a second position.
FIG. 13 shows that a movable monitor 22B according to a fourth
embodiment is in a second position.
FIG. 14 shows that the movable monitor 22B is in a second position.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
<First Embodiment>
<Configuration of Main Portion of Digital Camera>
FIGS. 1 through 3 are perspective views each showing the configuration
of the main portion of a digital camera 1A according to a first
embodiment of the present invention. FIG. 1 is a perspective view
from the front side. FIG. 2 is a perspective view from the front
side in a state where an image capturing optical unit is housed
in the body of the camera. FIG. 3 is a perspective view from the
back side. The digital camera 1A has a structure which is broadly
divided into an image capturing optical unit 3 having an almost
cylindrical shape and a camera body 10 having an almost rectangular
parallelepiped shape.
The image capturing optical unit 3 has a lens 31 and a lens-barrel
30 for holding the lens 31. The lens-barrel 30 is constructed so
as to project and retreat from/on the camera body 1. When the lens-barrel
30 is housed in the camera body 10, the lens 31 is covered with
a lens barrier 909.
In the upper portion of the front of the camera body 10, an AF
unit 5 for automatic focusing (hereinbelow, abbreviated as "AF")
and a flash 6 are provided.
On the top face of the camera body 10, a release button 7, a mode
switch 8, a self-timer shooting setting switch 9, and a display
17 are provided.
The release button 7 is an operating member such that when the
release button 7 is half-pressed, a switch S1 is turned on (preparation
for image capturing) and when the release button 7 is pressed all
the way in, a switch S2 is turned on (release). The mode switch
8 switches the modes "OFF", "recording" and
"reproduction". The self-timer shooting setting switch
9 switches the setting between normal shooting and self-timer shooting
each time the switch 9 is pressed. The display 17 which takes the
form of, for example, an LCD displays captured data, setting of
self-timer shooting, a frame number at the time of shooting, and
other set modes.
On one of the side faces of the camera body 10, a memory card slot
18 is provided. The memory card slot 18 is formed in a slit from
which an external recording medium 112 (hereinbelow, called a "memory
card") is inserted into the camera body 10.
The camera body 10 further comprises, on its rear face, zoom bottoms
14 and 15, a focus display lamp 907, and an image display unit 2.
When the zoom button 14 is pressed, the lens 30 is driven to the
wide side. When the zoom button 15 is pressed, the lens 30 is driven
to the tele-side. The zoom buttons 14 and 15 also function as access
buttons for calling image data recorded in the memory card 112 at
the time of reproduction. Recorded images are forward fed (UP) each
time the zoom button 14 is pressed and are reversely fed (DOWN)
each time the zoom button 15 is pressed.
The focus display lamp 907 is lit when the image capture preparing
operation is finished in a state where the button 7 is half-pressed
(the switch S1 which will be described hereinlater is ON). The focus
display lamp 907 blinks when the subject is too close to capture
an image or when the flash is being charged, thereby letting the
user know about it.
The image display unit 2 has an electronic view finder (EVF) 21
functioning as a first display unit and a movable monitor 22A as
a second image display unit.
The EVF21 electronically displays a real-time image of a subject
at the time of shooting.
The movable monitor 22A is formed in an almost rectangular thick
plate shape. The size of the principal plane A2 is larger than that
of a display face A1 of the EVF 21. The movable monitor 22A has
a liquid crystal display body (monitor body) 22m for image display
and is constructed so as to be translatively movable between a first
position P11 in which the display face A1 of the EVF 21 is covered
with the movable monitor 22A as shown in FIG. 3 and a second position
P12 in which the display face A1 of the EVF 21 is not covered but
is exposed as shown in FIG. 5A which will be described hereinlater.
Although not shown, in the movable monitor 22A, a back light, wires
and the like necessary for displaying of the monitor body 22m are
housed. The inherent display face of the EVF 21 exists deeper than
the eyepiece of the EVF 21. When the user looks an image of a subject
through the eyepiece of the EVF21, however, since the user looks
the image in the range of the eyepiece, the surface of the eyepiece
is regarded as a substantial display face in this case.
On the monitor body 22m, a captured image of a subject can be electronically
reproduced and displayed and also, like the EVF 21, an image of
the subject can be electronically displayed in a real-time manner
in the image capturing mode.
FIG. 4 is a block diagram showing a functional configuration of
the digital camera 1A.
The digital camera 1A has a system controller (hereinbelow, called
a CPU) 100 for controlling the operations of the whole camera. The
CPU 100 performs various functions by executing predetermined software.
Especially, the CPU 100 functions as a display controller which
performs: a first control for making the EVF 21 as a first display
unit incapable of displaying an image when the movable monitor 22A
is in the first position P11; and a second control for making the
EVF 21 as a first display unit capable of displaying an image when
the movable monitor 22A is in the second position P12.
An image of a subject focused through the lens 31 is captured by
a solid state image pickup device (hereinbelow, called a CCD) 101.
An output image signal of the CCD 101 is processed by a signal processing
unit 102. The lens 31 is driven by a lens driving unit 103 so that
the focus is achieved on the basis of a range measurement result.
A range measuring unit 104 measures the distance to the subject
by using, for example, a phase difference detecting method or the
like. An amount of driving the lens 31 by the lens driving unit
103 is calculated from the range measurement data. The lens driving
unit 103 also makes the lens-barrel 30 for holding the lens 31 project
or retreat and opens or closes the lens barrier 909. A photometrical
unit 105 measures the brightness of the subject and outputs photometrical
data to the CPU 100. An exposure control unit 106 receives data
of exposure time (shutter speed) Tv and an aperture value Av sent
from the CPU 100, which is obtained on the basis of the range measurement
result and the photometrical result, and controls the exposure of
the camera. A position detecting unit 123 detects the position of
the movable monitor 22A which will be described in detail hereinlater.
A flash unit 108 is controlled by a boost control signal for charging
and a light emission control signal which are sent from the CPU
100 and allows the flash 6 to flash.
A power supply 109 supplies power of a predetermined high voltage
to the CCD 101 and power of a voltage at a predetermined level to
the CPU 100 and each of other circuits.
A recording unit 111 is a data recording unit fixedly provided
within the camera. At the time of capturing an image, captured image
data subjected to a predetermined image process in the signal processing
unit 102 is recorded in the recording unit 111.
The memory card 112 is a recording medium such as an SRAM which
is removably inserted to the camera body 10. The memory card 112
can record data of a plurality of images. Data can be transferred
between the memory card 112 and the CPU 100 via an I/F unit 113.
In the case of transferring data to a personal computer or the like,
the image data recorded in the recording unit 111 is once transferred
to the memory card 112 and is read on the personal computer side.
The functions of switches SOFF to SSELF will be described hereinbelow
one by one.
SOFF: A switch SOFF is turned on when the mode switch 8 is in the
position of "OFF" to make the camera inoperative.
SREC: A switch SREC is turned on when the mode switch 8 is in the
position of "recording" to make the camera recordable.
SREP: A switch SREP is turned on when the mode switch 8 is in the
position of "reproduction" to make a recorded image reproducible
on the movable monitor 22A.
S1: The switch S1 is turned on when the release start button 7
is pressed through one stage (half-depression) at the time of shooting
to instruct preparation of capturing an image.
S2: The switch S2 is turned on when the release start button 7
is pressed through two stages (full depression) at the time of shooting
to instruct exposure.
SUP: A switch SUP is turned on each time the access button 15 is
pressed to perform forward reproduction of recorded images.
SDOWN: A switch SDOWN is turned on each time the access button
14 is pressed to perform reverse reproduction of recorded images.
SCARD: A switch SCARD is turned on while the memory card 112 is
inserted.
SSELF: A switch SSELF is turned on when the mode is switched between
regular shooting and self-timer shooting each time the self-timer
shooting setting switch 9 is pressed.
<Positions of Movable Monitor 22A>
FIG. 3 which has already been explained shows a state where the
movable monitor 22A is in the first position P11 in which the eyepiece
of the EVF 21 is covered with the movable monitor 22A. FIGS. 5A
and 5B show a state where the movable monitor 22A is in the second
position P12. As shown in FIG. 5A, in the second position P12, the
eyepiece of the EVF 21 is not covered with the movable monitor 22A
but is exposed.
The digital camera 1A is provided with two guide grooves Ga and
Gb which are parallel to each other and are provided almost in the
horizontal direction on the back face of the camera body 10. The
movable monitor 22A is slidable in the horizontal direction Y along
the guide grooves Ga and Gb. The sliding mechanism will be described
hereinbelow.
FIG. 5B is a cross section showing an YZ plane of the guide groove
Ga for explaining the sliding function. The two directions are normal
to the back face of the camera body 10.
The movable monitor 22A has a plate-shaped projection 22t having
a thickness almost equal to the width of the guide groove Ga. When
the projection 22t is fit in the guide groove Ga, the movement of
the movable monitor 22A is restricted in the Y direction. In the
projection 22t, a flexible cable FC for supplying power and a signal
for displaying an image on the monitor body 22m is housed.
A casing 10w of the camera body 10 is provided with stoppers SP1
and SP2 for regulating the movement in the Y direction of the movable
monitor 22A. Each of the stoppers SP1 and SP2 has a recess H. When
the projection 22t of the movable monitor 22A fits in the recess
H, the movable monitor 22A is half-fixed in the predetermined position
(first position P1 or second position P12). On the stopper SP2,
a sensor SN as a position detecting unit 123 in FIG. 4 is provided.
By pressing the sensor SN with the projection 22t, the sensor SN
is turned on. That is, the sensor SN can detect that the movable
monitor 22A is in the second position P12.
<Operation of Digital Camera 1A>
The basic operation of the digital camera 1A having such a configuration
will be described both from the viewpoint of operation of the user
and from the viewpoint of control of the digital camera 1A. The
basic operation from the viewpoint of operation of the user will
be described first as follows.
The mode switch 8 is operated to make the digital camera 1A operative.
The user arbitrarily selects either the EVF 21 or the movable monitor
22A to look a real-time image (view image) of a subject. In the
case of looking a real-time image of the subject by using the EVF
21, the user manually moves the movable monitor 22A from the first
position P11 in FIG. 3 to the second position P12 in FIG. 5A. When
the movable monitor 22A is moved to the second position P12 in FIG.
5A, a real-time image display on the movable monitor 22A is erased
by a control routine which will be described hereinlater, and a
real-time image starts to be displayed on the EVF 21. The user looks
the real-time image of the subject through the finder corresponding
to the display face A1 of the EVF 21 (FIG. 3), adjusts the zoom
magnification and framing, and captures an image of the subject
by pressing the release button 7.
On the other hand, in the case of displaying a real-time image
of the subject by using the movable monitor 22A, the user manually
moves the movable monitor 22A from the second position P12 in FIG.
5A to the first position P11 in FIG. 3. When the movable monitor
22A is substantially apart from the second position P12 in FIG.
5A, a real-time image starts to be displayed on the movable monitor
22A and the real-time image on the EVF 21 is erased. The user looks
the real-time image of the subject displayed on the movable monitor
22A, adjusts the zoom magnification and framing, and captures an
image of the subject by pressing the release button 7.
A routine for controlling the series of operations on the digital
camera 1A side is as follows.
FIG. 6 is a flowchart for explaining an operation of displaying
an image of a subject. The control of the image display is automatically
executed by the CPU 100.
First, in step ST1, whether the movable monitor 22A is in the second
position P12 or not is determined. That is, whether or not the sensor
SN is pressed by the projection 22t of the movable monitor 22A and
is in the ON state is determined. When the movable monitor 22A is
not in the second position P12, the routine advances to step ST2.
When the movable monitor 22A is in the second position P12, the
routine advances to step ST3.
In step ST2, since the movable monitor 22A is in the first position
P11 and the EVF 21 is covered with the movable monitor 22A, no image
is displayed on the EVF 21 but an image of the subject is displayed
on the monitor 22.
In step ST3, since the movable monitor 22A is in the second position
and the monitor body 22m is exposed, an image of the subject is
displayed on the EVF 21 and, on the other hand, no image is displayed
on the monitor 22A.
By the operations, when the movable monitor 22A is in the first
position P11 in which the display face of the EVF 21 is covered
with the movable monitor 22A, by displaying no image on the EVF
21, a power-thrifty digital camera can be achieved. When the movable
monitor 22A is in the second position P12, a real-time image of
the subject can be looked only by the EVF 21 and a moving picture
is not displayed on the movable monitor 22A. From this point as
well, the power can be saved.
When the movable monitor 22A is in the first position P11, since
the display face A1 of the EVF 21 is covered with the movable monitor
22A, the user can easily understand that the EVF 21 is not used
for display at that time point. The user does not therefore look
into the EVF 21 on which no image is displayed.
Further, in a state such that the digital camera 1A is not used,
by setting the movable monitor 22A in the first position P11, adhesion
of dusts and dirt onto the eyepiece corresponding to the display
face A1 of the EVF21 can be decreased.
<Second Embodiment>
<Configuration of Main Portion of Digital Camera>
The configuration of a digital camera according to a second embodiment
of the invention is similar to that of the digital camera 1A of
the first embodiment except for the configuration of an image display
section.
FIG. 7 is a perspective view showing the back face of a digital
camera 1B according to the second embodiment. In FIG. 7, the movable
monitor 22B is in the first position P21. The movable monitor 22B
is provided with the monitor body 22m (shown by imaginary lines)
so as to face the display face A1 of the EVF 21. The digital camera
1B is provided with a switch button 23 functioning as operation
input device (designating device) for selecting either the EVF 21
or the monitor 22m to display an image.
With the configuration of the image display section, the state
where the movable monitor 22B is in the second position P22 is different
from the state where the movable monitor 22B is in the second position
P12 in the first embodiment (refer to FIGS. 5A and 5B).
FIG. 8 is a diagram showing a state where the movable monitor 22B
is in the second position P22. As shown in FIG. 8, the digital camera
1B has an arm 24 which supports the movable monitor 22B in an end
portion of the back face of the camera body 10.
The arm 24 is swingable around a vertical swing shaft Ca in the
camera body 10 as a center. The arm 24 is also swingable around
a vertical swing shaft Cb in the movable monitor 22B by a hinge
mechanism (refer to FIG. 9A). By the mechanism having the two swing
shafts Ca and Cb, the movable monitor 22B can be set in the second
position P22 including: a position P22a in which the display face
A1 of the movable monitor 22B closely faces a side face of the camera
body 10; and a position P22b (shown by imaginary lines) in which
the movable monitor 22B is in parallel with the back face of the
camera body 10. In the second position P22 of the movable monitor
22B, both the display faces A1 and A2 of the EVF 21 and the monitor
body 22m are exposed to the outside.
FIG. 9B is a cross section of an XY plane for explaining a position
detecting mechanism of the movable monitor 22B.
The arm 24 has a projection 24t which projects along the swing
shaft Ca. The projection 24t has a disc 24d. A plurality of slits
are provided in the radial direction of the disc 24d. The casing
10w of the camera body 10 is provided with an optical sensor PT
having a light emitting device and a light receiving device. The
combination of the disc 24d and the optical sensor PT functions
as an encoder EN so that the rotation angle of the arm 24, that
is, the movable monitor 22B in the swing shaft Ca can be detected.
For convenience, it is now assumed that the angle detected by the
encoder EN when the movable monitor 22B is in the first position
P21 (refer to FIG. 7) is 0 degree and the angle detected by the
encoder EN when the movable monitor 22B is in the second position
P22 (refer to FIG. 8) is 90 degrees. The flexible cable FC for supplying
power and signals for displaying an image on the monitor 22 is housed
in the arm 24.
<Operation of Digital Camera 1B>
The basic operation of the digital camera 1B having such a configuration
is substantially the same as that of the digital camera 1A of the
first embodiment except for the operation of displaying an image
of a subject. FIG. 10 is a block diagram of the digital camera 1B.
The digital camera 1B is different from that of FIG. 4 with respect
to the point that a switch Sdis which is turned on by the depression
of the switch button 23 (FIG. 7) to be described hereinlater is
added.
FIG. 11 is a flowchart for explaining the operation of displaying
an image of a subject in the digital camera 1B.
In step ST11, whether the movable monitor 22B is in the first position
P21 or the second position P12 is determined. That is, whether the
swing angle of the arm 24 (movable monitor 22B) is 0 or 90 degrees
is determined by the encoder EN. The angles of the arm 24 is not
limited to the two values of 0 degree and 90 degrees but lie in
a range from 0 to 90 degrees when the arm 24 has an intermediate
posture between the first and second positions P21 and P22. Consequently,
for example, the following manner is possible. 45 degrees is used
as a threshold, an angle from 0 to 45 degrees is regarded as 0 degree,
and an angle from 45 to 90 degrees is regarded as 90 degrees. It
is also possible to regard most angles as 90 degrees except for
angles which can be substantially regarded as 0 degree within an
angle detection error of the encoder EN. In the case where the movable
monitor 22B is in the first position P21, the routine advances to
step ST12. When it is in the second position P22, the routine advances
to step ST13.
In step ST12, the movable monitor 22B is in the first position
P21. Since the display face A1 of the EVF 21 is covered with the
movable monitor 22B and the display faces A1 and A2 of the EVF 21
and the monitor body 22m are not exposed to the outside, no image
is displayed on both the EVF 21 and the monitor body 22m.
In step ST13, whether or not the switch button 23 is pressed by
the user to display an image on the EVF 21 is determined. When it
is instructed by the depression of the switch button 23 to switch
to the EVF 21, an image is displayed on the EVF 21 and no image
is displayed on the movable monitor 22B (step ST14). On the other
hand, when the switch button 23 is not pressed and the mode is not
switched to the EVF 21, an image is displayed on the monitor body
22m and no image is displayed on the EVF 21 (step ST15).
By the above operations, when the movable monitor 22B is in the
second position P22 in which the display face of the EVF 21 is not
covered, the display mode can be switched between the EVF 21 and
the monitor body 22m by the switch button 23. Consequently, a power-thrifty
digital camera can be realized.
In a state such that the digital camera 1B is not in use, by setting
the movable monitor 22B in the first position P21, adhesion of dusts
or dirt onto the display faces A1 and A2 of the EVF 21 and the movable
monitor 22B can be decreased.
Further, in the position P22a, the movable monitor 22B is in close
contact with a side face of the camera body 10. In the case of displaying
an image on the display face A1 of the EVF 21, the movable monitor
22B does not hinder the operation of looking an image into the finder.
<Third Embodiment>
<Configuration of Main Portion of Digital Camera>
A digital camera according to a third embodiment of the present
invention has a configuration similar to that of the digital camera
1B of the second embodiment except for, mainly, the configuration
of the image display unit 2.
FIG. 12 shows that the movable monitor 22A in the third embodiment
is in a second position P32. A first position P31 of the movable
monitor 22A is different from that in the second embodiment but
is similar to the first position P11 in which the display face A2
of the monitor body 22m is exposed as in the first embodiment shown
in FIG. 3. Since a digital camera 1C is provided with an arm 24
having two joints in a manner similar to the second embodiment,
the movable monitor 22A can be set in the second position P32 including:
a position P32a in which the display face A1 of the movable monitor
22A is adjacent to and faces a side face of the camera body 10;
and a position P32b (shown by imaginary lines) in which the movable
monitor 22A is in parallel with the back face of the camera body
10. In the second position P32 of the movable monitor 22A, the display
face A2 of the monitor body 22m cannot be seen from the rear side
of the digital camera 1C. Consequently, it is unnecessary for the
user to switch the display between the display faces A1 and A2,
so that the switch button 23 in the second embodiment is unnecessary.
The block diagram of the digital camera 1C is similar to FIG. 4.
The operation of displaying an image of a subject by the digital
camera 1C having such a configuration is similar to the flowchart
of FIG. 6.
When the movable monitor 22A is in the first position P31 in which
the display face of the EVF 21 is covered with the movable monitor
22A, by not displaying an image on the EVF 21, a power-thrifty digital
camera can be realized.
When the movable monitor 22A is in the first position P31, the
display face A1 of the EVF 21 is covered with the movable monitor
22A. Consequently, the user can easily understand that the EVF 21
is not used for displaying an image at the time point. The user
does not therefore try to look an image into the EVF 21 on which
no image is displayed.
Further, in a state such that the digital camera 1C is not in use,
by setting the movable monitor 22A in the first position P31, adhesion
of dusts and dirt onto the eyepiece corresponding to the display
face A1 of the EVF 21 can be decreased. Since the display face of
the second display member faces the camera body when the movable
monitor 22A is in the second position, adhesion of dusts and dirt
onto the display face A2 of the monitor body 22m can be decreased.
<Fourth Embodiment>
<Configuration of Main Portion of Digital Camera>
A digital camera according to a fourth embodiment of the present
invention has a configuration similar to that of the digital camera
1B of the second embodiment but only the swinging direction of a
movable monitor 22B and the state in the second position are different
from those of FIG. 8.
FIG. 13 shows that the movable monitor 22B in the fourth embodiment
is in a second position P42. A first position P41 is similar to
the first position P21 of the second embodiment as shown in FIG.
7. A digital camera 1D has a hinge HJ1 having a swing shaft parallel
to the Y axis. The movable monitor 22B is swingable around the hinge
HJ1 as a center with respect to the camera body 10. In a manner
similar to the digital camera 1B of the second embodiment, the digital
camera 1D has a detecting mechanism for detecting the swing angle
of the movable monitor 22B. A flexible cable for supplying power
and signals for displaying an image on the monitor body 22m is disposed
in the hinge HJ1.
The block diagram of the digital camera 1D is similar to FIG. 4.
The operation of displaying an image of a subject of the digital
camera 1D having such a configuration is similar to the flowchart
shown in FIG. 11.
When the movable monitor 22B is in the second position P42 in which
the display face of the EVF 21 is not covered, the display can be
switched between the EVF 21 and the monitor body 22m by the switch
button 23. Consequently, a power-thrifty digital camera can be achieved.
By setting the movable monitor 22B in the first position P41 in
a state such that the digital camera is not in use, adhesion of
dusts and dirt onto the display faces A1 and A2 of the EVF 21 and
the monitor body 22m can be decreased.
Further, in the fourth embodiment, a single hinge is used in place
of the arm having two joints in the digital camera 1B in the second
embodiment. The configuration of the digital camera can be therefore
simplified.
A digital camera 1E comprising a hinge HJ2 having a vertical swing
shaft which is parallel to the X axis as shown in FIG. 14 can also
produce effects similar to those of the digital camera 1D of the
fourth embodiment. The other configuration and operations of the
example of FIG. 14 are similar to those of the digital camera 1B
of FIG. 8.
<Modifications>
In the digital camera 1A of the first embodiment, another sensor
for sensing the first position P11 of the movable monitor 22A may
be provided. In this case, the first position P11 of the movable
monitor 22A can be more certainly detected.
It is not indispensable to use an encoder to detect the positions
of the movable monitors 22B to 22E in the second to fourth embodiment
but a sensor may be employed.
Although the display face A1 of the EVF 21 is completely covered
with the movable monitor 22A or 22B in each of the first positions
P11 to P41 in the foregoing embodiments, only a part of the display
face A1 of the EVF 21 may be covered with the movable monitor 22A
or 22B in each of the first positions P11 to P41.
In this case as well, since the user cannot substantially look
into the EVF 21, the user can know at the time point that no image
is displayed on the EVF 21.
The following configuration is also possible. When the movable
monitors 22A and 22B are in the second positions P12 to P42, by
receiving an exceptional operational input of the user, both of
the movable monitor 22A or 22B and the EVF 21 are allowed to display
an image. Specifically, although it is preferable from the viewpoint
of saving power that only one of them is allowed to display an image,
it is not prohibited to add an exception mode of allowing both of
them to display an image upon receipt of an exceptional request
from the user.
The first and second display units in the present invention are
not limited to an EVF and a liquid crystal monitor. Due to the configuration
that the display face of the first display unit is covered with
the second display unit, the present invention is mainly applied
to the case where the second display unit is larger than the first
display unit. Generally, however, the present invention can be applied
to a digital camera comprising first and second display units having
different display modes such as not only display units of different
sizes but also an eyepiece-type display unit such as an EVF and
a display unit such as a liquid crystal monitor which can be looked
away from it, and a monochrome display unit and a color display
unit.
While the invention has been described in detail, the foregoing
description is in all aspects illustrative and not restrictive.
It is understood that numerous other modifications and variations
can be devised without departing from the scope of the invention. |