JP2002182268A - Digital single lens reflex camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital single lens reflex camera provided with a focal plane shutter and capable of photographing while optionally selecting an optical finder or an electronic view finder. SOLUTION: Object light made incident on a photographic lens 1 is separated by a half mirror 2 attached at an inclination angle of 45 deg. to an optical axis, the straight advancing light after being transmitted through the mirror is guided to the image pickup surface of an imaging device 3, the light reflected upward at an angle of 90 deg. is guided to an eye through the reticle 4 of an optical finder system, a pentagonal prism 5 and an eyepiece 6. Besides, the focal plane shutter 7 is arranged in front of the imaging device 3, and a driving mechanism part 8 for the shutter 7 is arranged near the periphery of an exposure aperture and positioned in a direction opposite to the light reflected toward the optical finder system. Then, photographing is performed while selecting the optical finder or the electronic view finder without operating a switching mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a digital single-lens reflex camera provided with a focal plane shutter.

[0002]

2. Description of the Related Art A digital camera equipped with a focal plane shutter has an optical viewfinder for directly observing subject light transmitted through an optical component such as a lens, similarly to a camera using a film. , CCD
An electronic viewfinder is known which photoelectrically converts subject light received by an imaging device such as an electronic device and observes the image via a monitor. The electronic viewfinder can observe the subject image in the image frame to be photographed. To enable observation without parallax using the optical viewfinder, a single-lens reflex camera using a mirror or a pentaprism is used. Is known.

There are mainly two types of focal plane shutters used in such digital cameras. One type is provided with two shutter blades called a front blade and a rear blade, similar to the focal plane shutter employed in a camera using a film. Are operated in order, and the imaging surface is continuously exposed by slits formed by them. And this type of shutter
If the camera is equipped with an optical viewfinder, there is no need to perform complicated operations.However, if the camera is equipped with an electronic viewfinder, at least when the power is on, only the front blade is used. Is located at the exposure operation end position and the exposure opening is fully opened. At the time of photographing, the exposure operation needs to be performed after the leading blade closes the exposure opening.

The other type has only one shutter blade and fully opens the exposure opening before and during photographing, and closes the exposure opening only at the end of photographing. Is what you do. Therefore, the present invention can be applied to a camera equipped with an optical viewfinder and a camera equipped with an electronic viewfinder without making the shutter blades perform complicated operations. This can be said to be an advantageous configuration for obtaining a shutter speed (effective exposure time).

[0005] On the other hand, recent cameras have been increasingly electrified. In the case of a lens shutter, not only a shutter for a digital camera but also a motor for opening and closing the shutter blades has become common. In the case of a focal plane shutter employed in a camera using a film, it is natural to use a motor as a drive source for setting the shutter blades. A motor driven by a motor has also been proposed. And it is also possible in the case of a digital camera to cause all the operations of the shutter blades to be performed by a motor, and in particular, having a front blade and a rear blade,
When employed in a camera having an electronic viewfinder, it is effective for performing the above-described complicated operations.

[0006]

By the way, a digital single-lens reflex camera provided with an optical viewfinder is similar to a camera using a film when a photographer stands upright and shoots with both hands. It is possible to shoot. However, digital cameras have a strong image of electronic cameras, so even if the shutter sound can not be helped, the mirror operating sound and the subject can not be seen even for a moment, It's not good. Also, when holding and photographing with both hands, the eye cannot be released from the viewfinder, so when performing close-up shooting with the camera facing down, it is necessary to bend down and shoot in an impossible posture There is inconvenience.

On the other hand, in the case of a digital camera equipped with an electronic viewfinder, there is no mirror operating sound. In addition, since the camera is held away from the body when taking a picture while holding the camera, there is an advantage that the user does not need to bend down too much when performing close-up photography with the camera facing downward. However, even when the photographer stands upright and holds the camera with both hands to take a picture, the camera must be separated from the body, so the possibility of camera shake is large,
When taking a picture under normal light while carrying the sun or the like, there is a problem that the light shines on the screen of the monitor, making it difficult to see. Further, when all the operations of the shutter blades are performed by a motor, it is extremely advantageous in terms of manufacturing to mount the motor on the shutter unit instead of on the camera body side. There is also a problem such as how to arrange the units in the camera.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a focal plane shutter and to arbitrarily select an optical viewfinder and an electronic viewfinder. It is an object of the present invention to provide a digital single-lens reflex camera having an extremely excellent configuration capable of taking a picture by taking a picture.

[0009]

In order to achieve the above object, a digital single-lens reflex camera according to the present invention comprises a half mirror for splitting subject light transmitted through a photographing lens to an optical finder system and an image pickup device. A focal plane shutter that is disposed on the front surface of the image sensor and opens the exposure opening at least when the power switch of the camera is on, and captures images from the image sensor when the power switch is on. One of the monitor for displaying the captured image and the optical finder is selected so that the subject image can be observed.

Further, in the digital single-lens reflex camera of the present invention, the focal plane shutter includes a leading blade and a trailing blade which sequentially start exposure operations in the same direction at the time of photographing. After the leading blade covers the exposure opening and releases the charge of the image sensor, an exposure operation is performed by the leading blade and the trailing blade. The exposure aperture may be opened by returning only the rear blade.

In the digital single-lens reflex camera according to the present invention, the half mirror may be used to shoot light so as to make the light going to the image pickup device go straight and reflect the light going to the optical finder system at a substantially right angle. The lens is disposed at an angle of approximately 45 degrees with respect to the optical axis of the lens, and the driving mechanism of the focal plane shutter is located in the vicinity of the periphery of the exposure aperture and in the opposite direction to the light reflected to the optical finder system. If it is arranged in a position, the arrangement of the drive mechanism in the camera is advantageous.

Further, in the digital single-lens reflex camera of the present invention, the exposure aperture is substantially rectangular, and the optical finder system is disposed on one short side of the exposure aperture.
If the drive mechanism is arranged on the other short side of the exposure aperture, the choice of the external design of the camera can be increased.

Further, in the digital single-lens reflex camera of the present invention, the driving mechanism includes a front blade motor for operating the front blade and a rear blade motor for operating the rear blade. Then, it is possible to operate each blade in an arbitrary direction, and it is possible to select a control method as a digital camera, such as covering the exposure aperture with one of the blades when the power is turned off. Comes out.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the illustrated embodiments. FIG. 1 is an explanatory diagram showing a camera configuration of the embodiment. FIGS. 2 and 3 show the initial state (power-off state) of the focal plane shutter used in the camera of the embodiment. FIG. FIG. 3 is a cross-sectional view of a main part viewed from below in FIG.
FIG. 4 is a block diagram showing an example of a control circuit of the focal plane shutter in the embodiment. And
5 to 11 are diagrams for explaining the operation of the focal plane shutter in the embodiment.

The configuration of the embodiment will be described with reference to FIGS. First, as shown in FIG. 1, in the camera of the present embodiment, the subject light incident on the taking lens 1 is split by a half mirror 2 attached at an angle of 45 degrees with respect to the optical axis, passes through, and goes straight. The reflected light is guided to the imaging surface of the imaging device 3, and the light reflected upward at an angle of 90 degrees is focused on the focusing plate 4, the pentaprism 5,
The light is guided to the outside via the eyepiece 6. Further, a focal plane shutter 7 is disposed on the front surface of the image pickup device 3, and its driving mechanism 8 is located near the periphery of the exposure aperture and in a direction opposite to the light reflected to the optical finder system. Are located in

Next, the configuration of the focal plane shutter 7 will be described in detail with reference to FIGS. FIG.
As shown in FIG. 3 which is a cross-sectional view of the main part of FIG.
A space between the shutter base plate 9 and the intermediate plate 10 is a blade chamber of the front blade 12, and a space between the intermediate plate 10 and the auxiliary base plate 11 is the rear blade 13
The leading blade 12 and the trailing blade 13 are shown in FIG.
, And is not shown in FIG. As shown in FIG. 2, an opening 9a having a vertically elongated rectangle is formed in the center of the shutter base plate 9 made of synthetic resin, but is not shown in the intermediate plate 10 and the auxiliary base plate 11. An opening having the same shape is formed, and an exposure opening is formed by arranging the three openings in an overlapping manner.

In FIG. 2, the rear side of the shutter base plate 9
That is, the shaft 9b, the stoppers 9c, 9
d and 9e are provided, each of which penetrates through the holes formed in the intermediate plate 10 and the auxiliary base plate 11, and their tips are
It slightly protrudes to the back side of the auxiliary base plate 11, and its axis 9
A front blade 12 and a rear blade 13 are rotatably attached to b. The front blade 12 is stopped from rotating clockwise by the stopper 9c, and is stopped from rotating counterclockwise by contact of the overhang 12a with the stopper 9d. The counterclockwise rotation is stopped by the stopper 9e, and the clockwise rotation is stopped by the overhang 13a contacting the stopper 9d.

Photoreflectors 14 and 15 are mounted on the front side of the shutter base plate 9, that is, on the subject side. Each of the photoreflectors 14 and 15 includes a light-emitting unit and a light-receiving unit (not shown). Light emitted from the light-emitting units is transmitted through a hole 9 formed in the shutter base plate 9.
f, 9g and holes 10a, 10b formed in the intermediate plate 10.
, The light is reflected by a reflection sheet (not shown) attached to the auxiliary base plate 11, and is incident on each light receiving portion. Such a photoreflector 14, 1
As can be seen from the description below, 5 is the first blade 1
2 and for detecting the position of the rear blade 13.
In this embodiment, among the photocouplers generally used as photoelectric detectors, a photoreflector is employed, but a photointerrupter may be employed.

On the front side of the shutter base plate 9, the front blade 12
And a drive mechanism for the rear blade 13 is attached. The configuration of this drive mechanism has substantially the same configuration as the actuator described in JP-A-2000-60088, and two motors called moving magnet type motors are mounted on one common base frame 16. It is composed. That is, the base frame 16 is made of a synthetic resin, and as shown in FIG.
18 and two cover frames 19 and 20 made of synthetic resin are attached thereto. The cover frames 19 and 20 are shaped like inverted cylindrical flower pots, and are fixed to the base frame 16 by hooks (not shown) as is well known.

Rotors 21 and 22 having the same configuration are disposed in the hollow portions of the cover frames 19 and 20, and are supported by the cover frames 19 and 20 and the base frame 16, respectively. Although these rotors 21 and 22 are made of two-pole permanent magnets magnetized in the radial direction, in the case of the present embodiment, only their rotating shafts and portions protruding in the radial direction are made of synthetic resin. Drive pins 2 provided at the protruding portions thereof.
1a and 22a are elongated holes 16 formed in the base frame 16, respectively.
a, 16b penetrate through the long holes of the same shape formed in the shutter base plate 9, the intermediate plate 10, and the auxiliary base plate 11. And
The drive pin 21a has a long hole 13b formed in the rear blade 13.
The driving pin 22a is fitted in the long hole 12b of the front blade 12, so that the front blade 12 and the rear blade 13 can be rotated.

Further, coils 23 and 24 are wound around two stator frames constituted by the base frame 16 and the cover frames 19 and 20 so as to cover the bearings of the rotors 21 and 22. Further, four long grooves are formed in each of the cover frames 19 and 20, and the iron pins 2 are formed in the long grooves of the cover frame 19, respectively.
5, 26, 27, 28 are press-fitted, and iron pins 29, 30, 31, 32 are press-fitted into the long grooves of the cover frame 20. The cylindrical yoke yokes 33 and 34 are fitted to the outer peripheral surfaces of the cover frames 21 and 22. still,
In FIG. 2 (the same applies to FIGS. 5, 6, 7, 9, and 10), the boundaries between the two poles in the rotors 21 and 22 are indicated by broken lines. Also, iron pins 25 and 26 and iron pins 2
7 and 28 are arranged at positions symmetrical with respect to a straight line passing through the rotation axes of the two rotors 21 and 22. The iron pins 29 and 30 and the iron pins 31 and 32 are also arranged at the same relative positions. Have been.

Next, an example of a control circuit of the driving mechanism having the above-described configuration will be briefly described with reference to a block diagram shown in FIG. In FIG. 4, “first blade motor” is a motor having the above-described rotor 22, and “rear blade motor” is a motor having the rotor 21. First, various information including luminance information of a subject is processed into an input circuit and input as a signal. Thus, it is determined which of the leading blade motor and the trailing blade motor should be energized, and whether the current should be supplied in the forward direction or in the reverse direction. The current in the different direction is supplied via a constant current output circuit in consideration of a temperature change and the like. The supply of such a current can be performed to the two motors at substantially the same time. Also, a variable resistor is connected to each control current setting circuit, and the constant current value is changed by adjusting the resistance value at the time of manufacturing, so that the front blade and the rear blade are adjusted to meet a predetermined condition. The operating characteristics can be adjusted.

Next, the operation of the present embodiment will be described with reference to other drawings. The "first blade motor drive pulse" and the "rear blade motor drive pulse" described in the timing charts of FIGS. Means that the coils 24,
The direction and time of the current supplied to 23 are shown, in which the upper protrusion is a case where the current is supplied in the forward direction, and the lower protrusion is a case where the current is supplied in the reverse direction. The “first blade PR signal” and “rear blade PR signal” are signals detected by the photoreflectors 14 and 15, and reflected light from a reflection sheet provided on the auxiliary base plate 11, High when light is received, Lo when no light is received
w.

FIGS. 1 and 2 show a state where the power of the camera is off, that is, a state where the camera is not used. Therefore, the coils 23 and 24 are not energized. However, as long as the vibrations are not excessive, the rotors 21 and 22
Maintains this state, and the opening 9a, that is, the exposure opening is fully opened. Therefore, in this state, when the user looks into the eyepiece 6 of the optical finder, the light incident on the photographing lens 1 is reflected by the half mirror 2 and guided to the eyepiece 6, so that the observer can always observe. ing.
Further, since the exposure aperture of the focal plane shutter 7 is fully open, the light incident on the photographing lens 1 is split by the half mirror 2 and guided to the image sensor 3.
Since the power is off, observation on the monitor is not possible.

Here, the reason why the rotors 21 and 22 can maintain this state in the power-off state of FIG. 2 unless otherwise specified will be described. However, this is well known, and if the rotor 21 is described, the rotor 22 can be understood inevitably. Therefore, only the rotor 21 will be described here. In the state of FIG. 2, the suction force acting between the N pole of the rotor 21 and the iron pin 26 is larger than the suction force acting between the N pole and the iron pin 25. On the other hand, in the case of the S pole, the attractive force acting between the S pole and the iron pin 27 is smaller than that of the S pole.
8 is greater than the attraction force acting between them. As a result, a clockwise rotating force is applied to the rotor 21 and the drive pin 21a rotates the rear blade 13 in the counterclockwise direction.
e, and this state is maintained. In addition, such a state depends on the conditions, and the iron pins 25, 2
7 or the iron pins 26 and 28 may be maintained without them, but in the case of the present embodiment, all of them are provided in consideration of reliability.

In the state shown in FIGS. 1 and 2,
When the power switch is turned on, the electronic viewfinder functions. Therefore, the image formed on the image sensor 3 can be observed on the monitor. At this time, the coils 23 and 24 do not need to be energized. However, in some cases, the rotors 21 and 22 may not maintain the state shown in FIG. 2. ,Just in case,
The coils 23 and 24 are energized for a predetermined time. As a result, the coil 23 is energized in the reverse direction, so that the rotor 21 is given a clockwise rotating force,
On the other hand, since the coil 24 is energized in the forward direction, a force for rotating the rotor 22 in the counterclockwise direction is given to the rotor 22.
Can be reliably obtained. From this, it can be said that FIG. 2 shows both the state where the power is turned off and the state where the power is turned on but the shooting has not yet been performed. When shooting is performed in the latter state, For the reasons described above, the photographer arbitrarily selects an optical viewfinder or an electronic viewfinder without operating a switching mechanism or the like, and shoots.

The operation when flash photography is performed will be described first with reference to FIGS. 5 to 8 in addition to FIG. 2. In the description of the operation of this embodiment, the flash photography mode and the normal photography mode will be described. It is assumed that the camera is of a type that switches between and shoots. However, in this embodiment, the flash does not fire when shooting at a shutter speed faster than a predetermined shutter speed (effective exposure time), and when shooting at a speed lower than the predetermined shutter speed,
It is also possible to make the strobe emit light automatically, which can be understood from the following description.

When the release button is pressed during photographing, first, in the initial stage, the coil 24 is energized in the reverse direction. Therefore, the rotor 22 is rotated clockwise, and rotates the leading blade 12 counterclockwise. Further, the leading blade 12 retreats from the optical path of the photoreflector 14 at an initial stage of its operation.
Outputs a High signal. Thereafter, after closing the opening 9a, the leading blade 12 is stopped by the protrusion 12a abutting on the stopper 9d. Immediately thereafter, the power to the coil 24 is cut off. This state is shown in FIG.

In this manner, the time during which the coil 24 is de-energized is very short. However, also at this time, the rotor 22 can maintain this state. That is, the attractive force acting between the north pole and the iron pin 30 is greater than the attractive force acting between the north pole and the iron pin 29, and the attractive force acting between the south pole and the iron pin 31. Is larger than the suction force acting between the S pole and the iron pin 32. Then, in a state where the opening 9a is closed in this manner, when the electric charge accumulated in the image pickup device 3 is released, the photographing preparation is completed, and the state where the flash circuit can also function can be obtained. Become.

When the photographing preparation state is obtained, a forward current is supplied to the coil 24. Therefore, the rotor 2
2 is rotated counterclockwise, and the leading blade 12 is rotated clockwise to open the opening 9a. After that, the leading blade 12 cuts off the optical path of the photoreflector 14 immediately after the opening 9a is fully opened and before it abuts on the stopper 9c. The moment when the cutoff is performed is shown in FIG. ing. When the optical path of the photoreflector 14 is interrupted, a low signal is output from the photoreflector 14, so that the flash circuit operates and the strobe emits light. As described above, in the present embodiment, after the photographing preparation state is obtained, the output signal of the photoreflector 15 is low, and the output signal of the photoreflector 14 is high.
The strobe emits light only when it goes from igh to low. At almost the same time, the leading blade 12 comes into contact with the stopper 9c and is stopped, and immediately thereafter, the power to the coil 24 is cut off.

Thereafter, since the energization in the positive direction is performed to the coil 23 of the other motor, the rotor 21 is rotated counterclockwise, and the rear blade 13 is rotated clockwise. Therefore, the rear blade 13 closes the opening 9a,
Immediately after being completely closed, the overhang portion 13a comes into contact with the stopper 9d and is stopped. Immediately after that, the power supply to the coil 23 is cut off, and this state is shown in FIG. Therefore, in this case, flash photography has been performed, but the shutter speed controlled by the leading blade 12 and the trailing blade 13 is as shown in FIG. In this closed state, the captured image signal is transferred to the memory.
Even if the coil 23 is not energized, the fact that the rotor 21 maintains the state shown in FIG. 7 is considered to be obvious from the description so far, and the detailed description is omitted.

When the transfer of the image signal is completed as described above, since the current is supplied to the coil 23 in the reverse direction, the rotor 21 is rotated clockwise and the rear blade 13 is rotated.
Is rotated counterclockwise. Therefore, the rear blade 13 opens the opening 9a and immediately after the opening 9a is fully opened,
e and is stopped. And immediately after that,
When the power supply to the coil 23 is cut off, the state returns to the state shown in FIG. 2 when the power is turned on. Therefore, when performing the next photographing, it is only necessary to select one of the viewfinders and press the release button, and when not using the camera for the time being, it is sufficient to turn off the power. .

Next, the operation in the case where normal shooting is performed without flash shooting as described above will be described mainly with reference to FIGS. 2, 5, 7, 9 to 11. The description of the same operations as those described above will be omitted or simplified. First, until the power switch is turned on and photographing is performed, the state is the same as the above case, that is, the state shown in FIG. In addition, the release button is pressed in the state of FIG. 2, the state of FIG. 5 is reached, and the electric charge accumulated in the image pickup device 3 is released until the preparation for photographing is completed. Is the same. However, since the normal photographing mode is set, the flash circuit does not function.

When the photographing preparation state is obtained in this way, a positive current is supplied to the coil 24. Therefore, the rotor 22 is rotated counterclockwise to rotate the leading blade 12 clockwise to open the opening 9a, but before the leading blade 12 fully opens the opening 9a, the coil 23 To the rotor 2, the rotor 2
1 is rotated counterclockwise to rotate the rear blade 13 clockwise. As a result, the rear blade 13 is moved to the opening 9a.
Is closed, and the state at that time is shown in FIG. Then, in this state, the output signal of the photoreflector 15 has already become High.

Thereafter, the image pickup device 3 is exposed through a slit formed by the leading blade 12 and the trailing blade 13,
Immediately after the leading blade 12 has fully opened the opening 9a and before it comes into contact with the stopper 9c, the photo reflector 14
10 is shown in FIG. When the optical path of the photoreflector 14 is interrupted, a low signal is output from the photoreflector 14. In this case, the normal photographing mode is set, and the flash circuit is set not to function. Therefore, the strobe does not emit light. Also, even if the flash circuit is set to function, the photoreflector 1 has already been set.
Since the output signal of No. 5 is high, the strobe does not emit light. As can be seen from this, a shooting mode in which the strobe does not fire when shooting is performed at a time faster than the predetermined shutter speed, and the strobe flashes automatically when shooting is performed at or below the predetermined shutter speed. Can be provided.

After the state shown in FIG. 10 is reached, the leading blade 12 comes into contact with the stopper 9c and stops. Immediately thereafter, the trailing blade 13 brings the overhang 13a into contact with the stopper 9d. And stop. After the leading blade 12 and the trailing blade 13 have stopped, the power supply to the coils 24 and 23 is also sequentially cut off, and the state shown in FIG. 7 is obtained. Then, in this closed state, after the captured image signal is transferred to the memory, the coil 23 is energized in the reverse direction,
The rear blade 13 rotates counterclockwise and is stopped by the stopper 9e, and the power supply to the coil 23 is cut off, thereby returning to the state of FIG. 2 when the power is on.

As described above, in the case of the present embodiment, since the half mirror 2 is used, the operation sound of the mirror is not generated as in the conventional digital single-lens reflex camera, so that the digital camera is more suitable. Has become. In addition, the drive mechanism is arranged on one short side of the rectangular exposure opening, and the front blade and the rear blade are operated in a rotary manner, so that the area and rotation angle of each blade can be reduced. By arranging the optical viewfinder on the other short side, the external shape of the camera can be made compact. can do.

In the above embodiment, the case where the exposure aperture is fully opened even when the power is off is described. However, in order to suppress the deterioration of the photoelectric conversion function of the image sensor,
When the power is off, the exposure aperture can be closed by the leading blade or the trailing blade to prevent light from shining on the image sensor. In the above embodiment,
Each of the front blade and the rear blade independently operating is configured by one blade, but may be configured by a plurality of blades, as in a well-known focal plane shutter, The front blade and the rear blade may not be provided, and only one or a set of blades may be provided. Therefore, a disk-shaped rotary shutter that has been known for a long time may be used.

Furthermore, in the above embodiment, when the leading blade and the trailing blade perform the exposure operation, both of them always operate the exposure opening substantially from the left side to the right side. It is also possible to perform the exposure operation. That is, the previous shooting ends as described above,
When the next photographing is performed after returning to the state of FIG. 2, the exposure operation may be performed after closing the exposure opening in the state of FIG. 7 instead of the state of FIG. Therefore, in that case, the rear blade at the time of the previous photographing becomes the front blade, and the rear blade at the previous photographing becomes the rear blade.
The same applies to a case where only one or a set of blades is provided.

[0040]

As described above, in the digital single-lens reflex camera of the present invention, the optical viewfinder and the electronic viewfinder can be freely selected according to the photographing environment without any switching operation. It has the feature that it is possible to take a picture.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a camera configuration of an embodiment.

FIG. 2 is a plan view showing an initial state (power-off state) of a focal plane shutter used in the camera according to the embodiment and viewed from a subject side when incorporated into the camera.

FIG. 3 is a sectional view of a main part viewed from below in FIG. 2;

FIG. 4 is a block diagram illustrating an example of a control circuit of a focal plane shutter according to the embodiment.

5 is a plan view of the configuration shown in FIG. 2 as viewed in the same manner as FIG. 2, and shows a state in which a release has been performed at the time of photographing but before an exposure operation has been performed;

FIG. 6 is a plan view of the configuration shown in FIG. 2 as viewed in the same manner as FIG. 2, and shows a state at the moment when a flash is emitted during an exposure operation.

FIG. 7 is a plan view of the configuration shown in FIG. 2 as viewed in the same manner as FIG. 2 and shows a state immediately after the end of an exposure operation.

FIG. 8 is a timing chart necessary for explaining a case where flash photography is performed by the focal plane shutter having the configuration shown in FIG. 2;

FIG. 9 is a plan view of the configuration shown in FIG. 2 as viewed in the same manner as in FIG. 2 and shows a state immediately after the start of an exposure operation when a flash is not emitted.

FIG. 10 is a plan view of the configuration shown in FIG. 2 as viewed in the same manner as in FIG. 2 and shows a state immediately before the end of the exposure operation when the flash is not emitted.

FIG. 11 is a timing chart necessary for explanation when flash photography is not performed by the focal plane shutter having the configuration shown in FIG. 2;

[Explanation of symbols]

Reference Signs List 1 shooting lens 2 half mirror 3 image sensor 4 focusing plate 5 pentaprism 6 eyepiece 7 focal plane shutter 8 drive mechanism 9 shutter base plate 9a opening 9b shaft 9c, 9d, 9e stopper 9f, 9g, 10a, 10b hole 9h, 9i Mounting portion 10 Intermediate plate 11 Auxiliary base plate 12 Front blade 12a, 13a Overhang portion 12b, 13b, 16a, 16b Slot 13 Rear blade 14, 15 Photoreflector 16 Base frame 17, 18 Screw 19, 20 Base frame 21, 22 Rotors 21a, 22a Drive pins 23, 24 Coils 25, 26, 27, 28, 29, 30, 31, 32 Iron pins 33, 34 Yoke

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 19/02 G03B 19/02 5C022 H04N 5/225 H04N 5/225 BF // H04N 101: 00 101: 00 F term (reference) 2H002 CC01 FB84 GA68 HA11 JA02 JA07 2H018 AA00 AA21 AA32 BE00 2H054 AA01 BB08 CA00 CB04 CB09 CB14 CD03 2H081 AA28 BB12 2H100 BB05 BB06 BB08 BB09 CC07 5C022 AC12 AC52 AC12 AC52 AC52

Claims (5)

[Claims] 1. A half mirror for dispersing subject light transmitted through a photographing lens and guiding the light to an optical finder system and an image pickup device, and an exposure opening disposed at the front of the image pickup device and at least when a power switch of the camera is turned on. A focal plane shutter that fully opens the camera, and when the power switch is turned on, selects one of a monitor that displays an image captured from the image sensor and an optical finder to select a subject image. A digital single-lens reflex camera characterized by being made observable. 2. The image pickup device according to claim 1, wherein said focal plane shutter includes a leading blade and a trailing blade which sequentially start an exposure operation in the same direction during photographing. After the charge is released, the exposure operation is performed by the leading blade and the trailing blade.After the exposure operation is completed, the image information stored in the image pickup device is transferred to the memory, and only the trailing blade is returned to open the exposure opening. The digital single-lens reflex camera according to claim 1, wherein: 3. The optical system according to claim 1, wherein the half mirror causes light traveling toward the image sensor to travel straight and reflects light traveling toward the optical finder system at a substantially right angle. Wherein the drive mechanism of the focal plane shutter is disposed near the periphery of the exposure aperture and at a position opposite to the direction of the light reflected to the optical finder system. Claim 1
Or the digital single-lens reflex camera according to 2. 4. The exposure opening has a substantially rectangular shape, the optical finder system is disposed on one short side of the exposure opening, and the driving mechanism is disposed on the other short side of the exposure opening. The digital single-lens reflex camera according to claim 3, wherein: 5. The motor according to claim 3, wherein the driving mechanism includes a motor for a front blade that operates the front blade, and a motor for a rear blade that operates the rear blade. Digital SLR camera.