JP2008053844A - Camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital camera capable of acquiring satisfactory images even if a normally open type shutter is used. <P>SOLUTION: The digital camera has: a CCD 221 for picking up a subject image from a photographing optical system; a shutter 213 disposed between the photographing optical system and the CCD 221 and in an open state in a charged state; a mirror charging lever 351 capable of driving a movable reflection mirror 201; a first shutter charging lever 361 capable of driving the shutter 213; a second shutter charging lever 383 capable of engaging with the lever 361 of the first shutter charging lever; cams 353, 355 capable of transmitting power to the mirror charging lever 351 and the first shutter charging lever 361; and a locking lever cam 381 configured to permit release of engagement of the second shutter charging lever 383 only in the state where the CCD 221 completes image data reading. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a camera having a live view display function, and more specifically, a so-called live view display function (also referred to as a through image display function or an electronic viewfinder function) that displays an image repeatedly acquired by an image sensor as a moving image on a display device. It has a camera.

In conventional cameras, the subject image is observed with an optical viewfinder. However, recent compact digital cameras abolish the viewfinder optical system together with the optical viewfinder, and continuously acquire images acquired by the image sensor. More and more, so-called live view display functions for displaying on a display device such as a liquid crystal monitor are increasing.

As such a live view display function, for example, the movable mirror is retracted from the photographing optical path and the focal plane shutter is fully opened to guide the subject image to the image sensor, and the obtained subject image is continuously displayed on the liquid crystal monitor. A digital single-lens reflex camera capable of live view that is displayed has been proposed (Patent Document 1). In this case, from the viewpoint of shortening the shutter time lag, it is conceivable to employ a so-called normal open type shutter that is opened in a shutter charge state as disclosed in Patent Document 2.
JP 2002-369042 A JP 2004-61865 A

However, when a normally open type shutter is adopted, the subject image signal is read from the image sensor with the shutter opened, and in this case, there is a problem that noise is added to the image signal. There is a fear.

The present invention has been made in view of such circumstances, and an object thereof is to provide a digital camera capable of obtaining a good image even when a normally open type shutter is used.

In order to achieve the above object, a camera according to a first aspect of the present invention is an imaging means capable of photographing a light beam from a photographing optical system, an insertion state capable of reflecting a light beam from the photographing optical system, and a camera from the photographing optical system. A reflecting member that can move to a retracted state retracted from the light beam, a shutter unit that is disposed between the imaging optical system and the imaging unit, and is open in a charged state, and the reflecting member can be driven A first lever; a second lever member capable of driving the shutter unit; a third lever member capable of locking the second lever member; and the first lever member and the second lever member. A cam member capable of transmitting power, and the third lever member has a cam member that is allowed to be unlocked only when image data reading of the imaging means is completed.
In the camera according to a second aspect of the present invention, in the first aspect, the third lever member can be unlocked only when the driving force to the second lever member is charged by the cam member. And

In order to achieve the above object, a camera according to a third aspect of the present invention is an imaging device capable of photographing a light beam from a photographing optical system, an insertion state capable of reflecting the light beam from the photographing optical system, and the photographing optical system. A reflecting member movable to a retracted state retracted from the luminous flux, a shutter unit that is disposed between the imaging optical system and the imaging means and is open in a charged state, the reflecting member, A cam member configured to drive a shutter unit and include a first cam section used before exposure and a second cam section used after exposure, and a lever capable of storing shutter unit driving force from the cam member A mechanism is provided to accumulate the driving force of the shutter unit in the second cam section, and release the shutter near the end of the second cam section when the storage is completed.
In the camera according to a fourth aspect of the present invention, in the third aspect, the shutter unit is in an open state when in a charged state and is in a light-shielded state when the exposure operation is complete.

In order to achieve the above object, a camera according to a fifth aspect of the present invention is an imaging means capable of photographing a light beam from a photographing optical system, an insertion state capable of reflecting the light beam from the photographing optical system, and the photographing optical system. A reflecting member movable to a retracted state retracted from the luminous flux, a shutter unit that is disposed between the photographing optical system and the imaging means and is open in a charged state, and the reflecting member can be driven A first lever member, a second lever member capable of driving the shutter unit, a third lever member capable of locking the second lever member, the first lever member, and the second lever member. A cam member capable of transmitting power to the lever member, and the third lever member can be unlocked only when the driving force to the second lever member is charged by the cam member. .

According to a sixth aspect of the present invention, there is provided a camera according to a sixth aspect of the present invention, an imaging means capable of photographing a light beam from a photographing optical system, a shutter unit disposed between the photographing optical system and the imaging means and opened in a charged state, and a reflection unit. The member and the shutter unit are driven, and a cam member composed of a first cam section used before exposure and a second cam section used after exposure, and the shutter unit driving force from the cam member are accumulated. A lever mechanism is provided, and the driving force of the shutter unit is accumulated in the second cam section, and the shutter is charged by releasing it near the end of the second cam section in the accumulation completed state.

In order to achieve the above object, a camera according to a seventh aspect of the present invention is disposed between an imaging unit that receives a subject luminous flux that has passed through a photographing lens and outputs a subject image signal, and between the photographing lens and the imaging unit. A shutter unit that is in an open state in a charging state, a driving force transmission member that transmits a charge driving force to the shutter unit in order to enter the charging state after the exposure operation by the imaging unit is completed, and the imaging unit from the imaging unit The driving force is transmitted by the driving force accumulating member that accumulates the charge driving force until the reading of the subject image signal is completed, and the charge driving force accumulated in the driving force accumulating member after the reading of the subject image signal is completed. A charging member for charging the shutter unit via the member is provided.
In a camera according to an eighth aspect based on the seventh aspect, the driving force transmitting member is composed of a cam and a lever member engaged with the cam, and the driving force accumulating member is composed of an elastic member.
According to a ninth aspect of the invention, there is provided a camera according to the seventh aspect, further comprising: a reflection mirror that is disposed between the photographing lens and the shutter unit and capable of changing an optical path of a subject light beam that has passed through the photographing lens. The driving force transmission member transmits the driving force to the reflection mirror.
Further, a camera according to a tenth aspect of the present invention is the camera according to the seventh aspect, further comprising monitor means for performing live view display as a moving image based on the subject image signal read from the imaging means.

In order to achieve the above object, a camera according to an eleventh aspect of the invention is disposed between an imaging means for receiving a subject luminous flux that has passed through a photographing lens and outputting a subject image signal, and between the photographing lens and the imaging means. A shutter unit that is in an open state in a charging state, a driving force transmission member that transmits a charge driving force to the shutter unit in order to place the shutter unit in a charging state, and reading out the subject image signal from the imaging unit Until the operation is completed, the shutter unit is provided with a driving force transmission prohibiting member that prohibits transmission of the charge driving force.
A camera according to a twelfth aspect of the present invention is the camera according to the eleventh aspect, further comprising a driving force accumulation member that accumulates the charge driving force while the transmission of the charge driving force is prohibited by the driving force transmission prohibiting member. After the reading of the subject image signal is completed, the shutter unit is charged by the charge driving force accumulated in the driving force accumulating member.

The camera of the present invention can provide a digital camera that can obtain a good image even when a normally open type shutter is used.

Hereinafter, a preferred embodiment using a digital single lens reflex camera to which the present invention is applied will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an internal mechanism of a digital single-lens reflex camera according to an embodiment of the present invention. FIG. 1A is a block diagram of an internal configuration along the optical axis direction of a photographing lens. ) Is a block diagram showing the internal configuration of the camera body 200 as viewed from the front.

A release button 21 is disposed on the upper surface of the camera body 200. The release button 21 has a first release switch that is turned on when the photographer is half-pressed and a second release switch that is turned on when the photographer is fully pressed. When the first release switch (hereinafter referred to as 1R) is turned on, the camera performs photographing preparation operations such as focus detection, focusing of the photographing lens, and photometry of the subject brightness, and the second release switch (hereinafter referred to as 2R). When it is turned on, a photographing operation for capturing image data of a subject image is executed based on the output of a CCD (Charge Coupled Devices) 221 (see FIG. 8) as an image sensor.

A movable reflecting mirror 201 is disposed in the mirror box of the camera body 200 on the optical axis of the photographing lens 101 (see FIG. 8) disposed inside the lens barrel 100. The movable reflecting mirror 201 captures a subject image and a reflection position inclined by 45 degrees with respect to the optical axis of the photographing lens 101 in order to reflect a subject light beam to a finder optical system (for example, a pentaprism 207). In order to guide to a CCD (Charge Coupled Device) 221), it can be rotated to a retracted position retracted from the photographing optical path. The rotation axis of the movable reflecting mirror 201 is along the direction perpendicular to the paper surface of FIG. The movable reflecting mirror 201 reflects the subject luminous flux upward. In this embodiment, the light is reflected upward. However, the present invention is not limited to this, and the reflection direction of the subject luminous flux is the most appropriate in terms of the arrangement of the mechanism member and the optical member regardless of the right or left side of the camera body. You may choose

A focusing screen 205 is disposed on the reflection optical axis of the movable reflection mirror 201, which is a matte surface for forming an image of a subject light beam by the photographing lens 101. The distance from the movable reflection mirror 201 is equivalent to that of the CCD 221. Arranged in position. Above the focusing screen 205, a pentaprism 207 for horizontally inverting the subject image is disposed. The finder eyepiece 33 is an eyepiece of the finder optical system, and the photographer can look into the eyepiece 33 to check the subject image.

Near the center of the movable reflecting mirror 201 described above is a half mirror, and on the back surface of the movable reflecting mirror 201, a sub mirror 203 is provided for distance measurement for reflecting the subject light beam that has passed through the half mirror section. ing. The sub mirror 203 is rotatable with respect to the movable reflection mirror 201. When the movable reflection mirror 201 is retracted from the photographing optical path and the subject light beam is incident on the CCD 221, the sub mirror 203 is rotated to a position covering the half mirror portion. When the movable reflection mirror 201 is at the subject image observation position (reflection position) as shown in the figure, it rises with respect to the movable reflection mirror 201 and is open so that a part of the subject luminous flux can be reflected by the distance measuring unit. The movable reflecting mirror 201 is driven by a shutter / mirror driving unit 303. A distance measuring unit 218 including a TTL phase difference type distance measuring circuit 217 (see FIG. 8) including a distance measuring sensor is disposed on the reflected light path of the sub mirror 203. The amount of focus shift of the subject image formed by is detected.

A normally open type focal plane shutter 213 is disposed behind the movable reflecting mirror 201 for exposure time control. The shutter 213 includes a shutter control unit 213a including a shutter drive mechanism 215 (FIG. 8) and a shutter mirror. Drive control is performed by the drive unit 303. A CCD 221 serving as an image sensor is disposed behind the shutter 213 and photoelectrically converts a subject image formed by the photographing lens into an electric signal. In the present embodiment, a CCD is used as an image sensor. However, the present invention is not limited to this, and a CMOS (Complementary Metal Oxide) is used.
Needless to say, a two-dimensional imaging device such as Semiconductor) can be used.

A battery 305 for supplying power to the entire camera body is disposed on the left side when viewed from the front of the camera body 200. Further, as will be described later, a mirror shutter (hereinafter abbreviated as “MS”) motor 301 serving as a driving source for the shutter 213 and the movable reflecting mirror 201 is disposed on the right side of the main body, and transmits the driving force of the MS motor 301. The shutter / mirror driving unit 303 for the motor is disposed below the MS motor 301 so as to engage with the driving shaft of the MS motor 301. A shutter control unit 213 a for controlling the driving of the shutter 213 is disposed on the right side of the movable reflecting mirror 201. The shutter controller 213a is connected to the shutter / mirror drive unit 303 via a mechanism (not shown).

Next, the driving mechanism of the movable reflecting mirror 201 and the shutter 213 will be described with reference to FIGS.
2A and 2B are diagrams showing a driving mechanism for the shutter 213 and the movable reflecting mirror 201, wherein FIG. 2A is a front view of the shutter 213, FIG. 2B shows a mirror-down state of the movable reflecting mirror 201, and FIG. FIG. 4 is a diagram showing a mirror-up state. As shown in FIG. 2A, a shutter control unit 213a is disposed on the side of the shutter 213, and a shutter set lever 213b protrudes below the shutter control unit 213a. In the initial state, the shutter set lever 213b is in the position (reset position) of the solid line in FIG. 2A, and in the shutter charge completed state, the position of the broken line in FIG. ) Position (set position).

As described above, the shutter 213 is a normal open type focal plane shutter. In the normal state, the shutter front curtain and the rear curtain are stored in the storage chamber, and the front of the CCD 221 is open. Prior to shooting with the CCD 221, the first and second curtain magnets are held. By returning the shutter set lever 213b to the initial state (a) in this state, the shutter front curtain moves to a closed state that blocks the photographing optical path. When the front curtain magnet is released in this state, exposure starts when the shutter front curtain starts running, and after the exposure time elapses, the shutter rear curtain starts running when the rear curtain magnet is released. End the exposure. After these exposure operations are completed, when the shutter set lever 213b is charged to the position (a) in the charging completion state, the shutter 213 is charged, and the shutter rear curtain is retracted from the photographing optical path and stored in the storage chamber. The front is open. As described above, the normal open type focal plane shutter is a shutter that is open in a normal state and temporarily closed before and after photographing.

When the movable reflecting mirror 201 is in the down state, the sub mirror 203 is rotated to an open position with respect to the movable reflecting mirror 201 as shown in FIG. As shown in FIG. 2B, a mirror down spring 345 is provided on the rotating shaft side of the movable reflecting mirror 201, and the mirror down spring 345 attaches it in the counterclockwise direction in FIG. It is energized. The movable reflecting mirror 201 biased by the mirror down spring 345 is regulated at a position of 45 degrees with respect to the photographing optical path by a position regulating pin 349. The mirror drive lever 341 has an L-shape, and is biased by a mirror drive spring 343 in the counterclockwise direction, that is, the up direction for raising the mirror. One end of the mirror driving lever 341 is disposed at a position where it can engage with an engaging pin 347 fixed to the movable reflecting mirror 201. Note that the spring force of the mirror drive spring 343 is always stronger than the spring force of the mirror down spring 345.

In the mirror down state, the mirror drive lever 341 is rotated clockwise by the mirror charge lever 351 against the urging force of the mirror drive spring 343, and is at the position shown in FIG. In this state, when the locking point of the mirror charge lever 351 that locks the mirror driving lever 341 rotates to the right, the mirror driving lever 341 rotates counterclockwise by the biasing force of the mirror driving spring 343. . With this rotation, the movable reflecting mirror 201 is rotated from the down position to the up position via the engagement pin 347, and the state shown in FIG. From this state, when the locking point of the mirror charge lever 351 with respect to the mirror drive lever 341 rotates to the left against the urging force of the mirror drive spring 343 and reaches the position of FIG. It becomes a state.

FIG. 3 is an exploded perspective view of the shutter / mirror driving unit 303 to which the driving force of the MS motor 301 is transmitted. The driving force of the MS motor 301 is transmitted to the cam gear 357 via a gear (not shown). A mirror charge cam 353 having a cam surface 353M that changes in the radial direction of the rotation axis of the cam gear 357 is fixed to the lower surface of the cam gear 357. The cam surface 353M of the mirror charge cam 353 has a mirror charge lever 351. One end 351M is engaged. The other end of the mirror charge lever 351 is in contact with the mirror drive lever 341. Since the mirror drive lever 341 is spring-biased in a direction to rotate the mirror charge lever 351 clockwise (see FIGS. 2B and 2C), one end of the mirror charge lever 351 is connected to the mirror charge cam 353. It will be pressed against. Accordingly, as the cam gear 357 rotates, the mirror charge cam 353 integrated therewith rotates, and the mirror charge lever 351 pressed against the cam surface 353M of the mirror charge cam 353 also rotates following it.

A shutter charge cam 355 having a cam surface 355S that changes in the radial direction of the rotation axis of the cam gear 357 is fixed on the upper surface of the cam gear 357, and the first shutter charge is placed on the cam surface 355S of the shutter charge cam 355. One end 361S of the lever 361 is engaged. A lock lever cam 381 is fixed on the upper surface of the shutter charge cam 355. The first shutter charge lever 361 is pivotally supported on the camera body, and the second shutter charge lever 383 is also coaxially supported. A coil spring 389 is disposed around the axes of the first shutter charge lever 361 and the second shutter charge lever 383.

A shutter charge pin 385 is implanted in the arm portion of the second shutter charge lever 383, and the shutter charge pin 385 is in a position capable of engaging with the shutter set lever 213b. The shutter lock lever 387 is pivotally supported by the camera body, and the lock claw 387R of the arm portion is at a position where it can engage with the cam surface 381R of the lock lever cam 381 provided on the shutter charge cam 355. Yes. Further, a locking claw 387a is provided at the other end of the arm portion of the shutter lock lever 387, and can be engaged with the locking portion 383a of the second shutter charge lever 383.

Next, the operation of the shutter / mirror drive unit 303 will be described with reference to FIGS. 4 shows the position of the lever at the exposure position, FIG. 5 shows the position of the lever immediately before the completion of the shutter charge, and FIG. 6 shows the position of the lever in the shutter charge completion state. First, in the state of FIG. 4, the movable reflecting mirror 201 is in the retracted position shown in FIG. 2C, and one end of the mirror charge lever 351 is in a position to engage with the mirror drive lever 341. The shutter set lever 213b is in the reset position (see the position (A) in FIG. 2A), and the second shutter charge lever 383 is engaged with the shutter set lever 231b. When the exposure operation is completed, the MS motor 301 starts to rotate, and the driving force is transmitted to the cam gear 357, the mirror charge cam 353 starts to rotate in the clockwise direction, and the mirror charge lever 351 engaged with the cam surface 353M. Also rotate clockwise. As a result, the mirror driving lever 341 rotates against the urging force of the mirror driving spring 343, so that the movable reflecting mirror 201 moves from the retracted position to the reflecting position, and mirror charging is performed (see FIG. 5).

Further, as the cam gear 357 rotates, the shutter charge cam 355 also starts to rotate clockwise. Accordingly, the first shutter charge lever 361 engaged with the cam surface 355S also rotates while accumulating the coil spring 389. The second shutter charge lever 383 is transmitted with rotational force via the coil spring 389, but is engaged with the shutter lock lever 387, and thus its rotation is prohibited and remains stationary.

When the shutter charge cam 355 is further rotated from the state shown in FIG. 5 and the state shown in FIG. 6 is reached, the cam surface 381R of the lock lever cam 381 abuts the lock claw 387R of the shutter lock lever 387. As a result, the shutter lock lever 387 rotates counterclockwise, and the engagement of the locking portion 387a of the second shutter charge lever 383 by the locking claw 387a is released. When this engagement is released, the second shutter charge spring 383 rotates counterclockwise by the spring force accumulated in the coil spring 389, and the shutter set lever 213b engaged with the shutter charge pin 383 is reset. It moves from the position (position (A) in FIG. 2A) to the set position (position (A) in FIG. 2A).

Thus, in the present embodiment, when the exposure operation is finished and the MS motor 301 starts rotating, first, the mirror drive lever 341 is rotated via the mirror charge lever 351 to move the movable reflecting mirror 201 from the retracted position. While moving to the reflection position, the mirror charging operation is performed. Further, when the MS motor 301 starts to rotate, the first shutter charge lever 361 starts rotating, but the second shutter charge lever 383 interlocked with the MS shutter 301 is locked by the shutter lock lever 387, so that the stationary In this state, the driving of the shutter set lever 213b is not immediately started (state shown in FIG. 5). As the MS motor 301 rotates, the second shutter charge lever 383 rotates for the first time when the lock lever cam 381 comes into contact with the lock claw 387R of the shutter lock lever 387, and the shutter set lever 213b moves from the reset position. Move to the set position (state shown in FIG. 6).

FIG. 7 is a development view of the cam surface 353M of the mirror charge cam 353 and the cam surface 355S of the shutter charge cam 355 described above. As shown in the figure, the cam surface 353M of the mirror charge cam 353 is composed of five regions: a lift cam a, a top dead center region b, a reverse lift cam c, and a bottom dead center region d, e. Further, the cam surface 355S of the shutter charge cam 355 is composed of five areas, that is, a lift cam a, top dead center areas b, c, d, and bottom dead center area e as shown in the figure. Although not shown, there are provided a plurality of photo interrupters for detecting the rotation or movement of the mirror charge cam 353, the shutter charge cam 355, or a member driven integrally therewith. By these photo interrupters, MS detection that outputs H level while in the region d and C detection that outputs H level between the middle of the region b and the end of the region b are performed. Further, the lock lever cam 381 moves in contact with the shutter lock lever 387 in the region b (see FIG. 7).

The cam area a is a mirror charge area, and is an area for driving the movable reflection mirror 201 from the retracted position to a reflection position that is positioned in the photographing optical path of the photographing lens 101. In this region, the mirror charge cam 353 changes from the bottom dead center to the top dead center, and the movable reflecting mirror 201 is driven in the counterclockwise direction from the retracted position in FIG. The charge operation of 343 is performed. The cam surface 355S of the shutter charge cam 355 is a lift cam. However, since the second shutter charge lever 383 remains locked by the shutter lock lever 387, there is no change, and the shutter 213 is in an uncompleted state. Yes, the shutter set lever 213b is in the position shown in FIGS.

The cam area b is a standby area, but the first half (the part where C detection corresponds to the L level) is substantially a shutter charge area, and the shutter lock lever 387 and the lock lever cam 381 collide with each other. The shutter charge lever 383 is rotated by the biasing force of the coil spring 389, and the shutter set lever 213b is driven from the reset position shown in FIGS. 2A and 2A to the charge position shown in FIGS. The shutter charge incomplete state changes to the shutter charge complete state. On the other hand, the cam surface 353M of the mirror charge cam 353 remains at the top dead center, and the movable reflection mirror 201 is located in the photographing optical path and is in a reflection position for reflecting the subject light beam to the finder optical system.

The second half of the cam area b (the part where C detection corresponds to the H level) is a substantial standby area, the mirror charge cam 353 is at the top dead center, and the movable reflecting mirror 201 is in the down state (FIG. 2 ( B)), that is, at the observation position (reflection position) where the subject light beam is reflected by the finder optical system. In this state, the subject luminous flux is guided to the finder optical system, so that the subject image can be observed by the finder. In addition, since the subject luminous flux is also guided to the photometric element 211 (see FIG. 8) and the camera body is in a power-on state, photometry can be performed. Further, since the subject light flux is guided to the distance measuring unit 218 by the sub mirror 203, distance measurement and driving of the photographing lens to the in-focus position (automatic focus adjustment) are possible.

Further, in the cam area a, the shutter charge cam 355 is driven to the top dead center and is maintained in the cam area b, so that the second shutter charge lever 383 is not yet locked by the shutter lock lever 387. , Charging is complete. Note that the shutter 213 is in a charged state, but the shutter set lever 213b is not retracted, so that the shutter curtain cannot run and exposure is not performed. Although the shutter 213 is a normally open type and is in an open state, the subject luminous flux does not directly enter the CCD 221 because the movable reflecting mirror 201 is in the down position.

The cam area c is a reverse charge area, and is a transition area from a standby area (cam area b) where observation is performed by a finder optical system to a live view area (cam area d). In this region, the cam surface 353M of the mirror charge cam 353 changes from the top dead center to the bottom dead center, and the mirror charge lever 351 moves from the position shown in FIG. 2 (B) to the position shown in FIG. 2 (C). The movable reflecting mirror 201 is changed from the reflecting position (down position) to the retracted position (up position) by the urging force of the mirror down spring 345. On the other hand, the cam surface 355S of the shutter charge cam 355 remains at the top dead center and remains in the shutter charge complete state while the second shutter charge lever 383 is not locked by the shutter lock lever 387.

In addition, since the cam surface 353a of the mirror charge 353 is slightly inclined, it is possible to return from the live view area to the standby area. For this reason, when performing the phase difference AF via the sub mirror 203 during live view or when the photometry by the photometry element 211 is necessary, the MS motor 301 is reversely rotated to return to the standby area, The configuration is such that these operations can be performed. Thus, by reciprocating between the area b and the area d, it is possible to drive the lens for repeated distance measurement and focusing.

The cam area d is a live view area and is an area for performing live view. The mirror charge cam 353 is at the bottom dead center, and the movable reflecting mirror 201 is in the up state (see FIG. 2C), that is, in the retracted position retracted from the imaging optical path. The shutter charge cam 355 is at the top dead center, and the shutter set lever 213b remains in the charged state shown in FIGS. In this state, the movable reflection mirror 201 is in the retracted position (up state), and the normally open type shutter 213 is in the open state, so that a subject image is formed on the CCD 221 serving as the image sensor. Accordingly, although the subject image cannot be observed with the optical finder, the image information from the CCD 221 can be output, and the subject image can be displayed on the liquid crystal monitor 26 based on the image information.

Since the cam area e is an imaging area and the mirror charge cam 353 is at the bottom dead center, the movable reflecting mirror 201 is in the up state (see FIG. 2C), that is, in the retracted position retracted from the imaging optical path. Further, since the shutter charge cam 355 moves to the bottom dead center, the shutter set lever 213b moves to the position shown in FIGS. 2A and 2A, and becomes a retracted position where the shutter front curtain and the rear curtain can travel. Yes. In this state, when 2R is turned on by operating the release button 21, the shutter front curtain and the rear curtain run according to the release of the suction of the shutter magnet that holds the shutter 213. During this time, the CCD 221 captures a still image, Can be recorded. When the shutter charge cam 355 moves to the bottom dead center, the shutter lock lever 387 locks the shutter charge lever 383 again.

The mirror charge cam 353 and the shutter charge cam 355 rotate counterclockwise (counterclockwise) in the drawing, and rotate the mirror charge lever 351 and the shutter charge lever 361 having the cam follower configuration as described above. In the normal mode, the shutter charging is completed and the movable reflecting mirror 201 is in the reflecting position (cam area b) and can be observed with the optical viewfinder, and is driven to the cam area e in accordance with the operation of the release button 21 to shoot. Do. On the other hand, in the live view mode, the shutter charge is completed and the movable reflecting mirror 201 is in the retracted position (cam area d), the live view display is performed on the liquid crystal monitor 26, and the cam area e is displayed according to the operation of the release button 21. Driven to shoot.

Next, the overall configuration of the digital single-lens reflex camera mainly including the electric system will be described with reference to FIG. In the digital single-lens reflex camera according to the present embodiment, as described above, the interchangeable lens 100 and the camera body 200 are configured separately, and both are electrically connected by the communication contact 300. Note that the interchangeable lens 100 and the camera body 200 can be configured integrally.

Inside the interchangeable lens 100, lenses 101 and 102 for focus adjustment and focal length adjustment, and a diaphragm 103 for adjusting the aperture amount are arranged. The lens 101 and the lens 102 are driven by a lens driving mechanism 107, and the diaphragm 103 is connected to be driven by a diaphragm driving mechanism 109. The lens driving mechanism 107 and the aperture driving mechanism 109 are each connected to a lens CPU 111, and the lens CPU 111 is connected to the camera body 200 via a communication contact 300. The lens CPU 111 controls the inside of the interchangeable lens 100. The lens CPU 111 controls the lens driving mechanism 107 to perform focusing and zoom driving, and also controls the aperture driving mechanism 109 to perform aperture value control.

In the camera main body 200, the movable reflecting mirror 201, the sub mirror 203, the focusing screen 205, and the pentaprism 207 are arranged as described above. The movable reflecting mirror 201 is driven by a mirror driving mechanism 219. An eyepiece lens 209 for observing a subject image is disposed on the emission side of the pentaprism 207, and a photometric sensor 211 is disposed at a position on the side of the pentaprism 207 that does not interfere with the observation of the subject image. The focusing screen 205, the pentaprism 207, and the eyepiece lens 209 constitute a part of the finder optical system.

As described above, the sub mirror 203 is provided on the back surface of the movable mirror 201, and the distance measuring circuit 217 including the distance measuring sensor is disposed in the reflection direction of the sub mirror 203. Further, a shutter 213 is disposed behind the movable mirror 201, and this shutter 213 is driven and controlled by a shutter drive mechanism 215. Further, a CCD 221 as an image sensor is disposed behind the shutter 213, and the subject image formed by the lenses 101 and 102 is photoelectrically converted into an electric signal. The CCD 221 is connected to a CCD drive circuit 223, and analog / digital conversion (AD conversion) is performed by the CCD drive circuit 223. The CCD drive circuit 223 is connected to the image processing circuit 227 via the CCD interface 225. The image processing circuit 227 performs various types of image processing such as color correction, gamma (γ) correction, and contrast correction. Also, image data for live view display on the liquid crystal monitor 26 is generated.

The image processing circuit 227 is an ASIC (Application Specific Integrated).
Circuit-specific integrated circuit) 271 is connected to the data bus 261. In addition to the image processing circuit 227, the data bus 261 includes a body CPU 229, a compression circuit 231, a flash memory control circuit 233, an SDRAM control circuit 236, an input / output circuit 239, a communication circuit 241, a recording medium control circuit 243, and a video signal output. A circuit 247 and a switch detection circuit 253 are connected.

The body CPU 229 connected to the data bus 261 controls the flow of this digital single lens reflex camera. A compression circuit 231 connected to the data bus 261 is a circuit for compressing the image data stored in the SDRAM 237 with JPEG or TIFF, or for expanding the image data. Note that image compression is not limited to JPEG or TIFF, and other compression methods can be applied. A flash memory control circuit 233 connected to the data bus 261 is connected to a flash memory 235. The flash memory 235 stores a program for controlling the flow of the single-lens reflex camera. The CPU 229 controls the digital single-lens reflex camera according to the program stored in the flash memory 235. Note that the flash memory 235 is an electrically rewritable nonvolatile memory. The SDRAM 237 is connected to the data bus 261 via the SDRAM control circuit 236, and the SDRAM 237 temporarily stores the image data processed by the image processing circuit 227 or the image data compressed by the compression circuit 231. This is a buffer memory.

The input / output circuit 239 connected to the above-described photometric sensor 211, shutter drive mechanism 215, distance measuring circuit 217, and mirror drive mechanism 219 controls input / output of data with each circuit such as the body CPU 229 via the data bus 261. . The communication circuit 241 connected to the lens CPU 111 via the communication contact 300 is connected to the data bus 261, and exchanges data with the body CPU 229 and the like and communicates control commands. A recording medium control circuit 243 connected to the data bus 261 is connected to the recording medium 245 and controls recording of image data and the like on the recording medium 245. The recording medium 245 can be loaded with any rewritable recording medium such as an xD picture card (registered trademark), a compact flash (registered trademark), an SD memory card (registered trademark), or a memory stick (registered trademark). And is detachable from the camera body 200. In addition, the hard disk may be configured to be connectable via a communication contact.

The video signal output circuit 247 connected to the data bus 261 is connected to the liquid crystal monitor 26 via the liquid crystal monitor drive circuit 249. The video signal output circuit 247 is a circuit for converting the image data stored in the SDRAM 237 and the recording medium 245 into a video signal to be displayed on the liquid crystal monitor 26. The liquid crystal monitor 26 is disposed on the back surface of the camera body 200. However, the liquid crystal monitor 26 is not limited to the back surface as long as the photographer can observe the image. A lens attachment / detachment detection switch 257 for detecting whether or not the interchangeable lens 100 is attached to the camera body 200 is provided in the lens attachment opening of the camera body 100. A switch for detecting the first and second strokes of the shutter release button, a switch for instructing a reproduction mode, a switch for instructing the movement of the cursor on the screen of the liquid crystal monitor 26, a switch for instructing a photographing mode, and each selected mode The various switches 255 such as an OK switch for determining etc. and the lens attachment / detachment detection switch 257 are connected to the data bus 261 via the switch detection circuit 253. The lens attachment / detachment switch 257 is a known mechanical switch that detects attachment / detachment of the lens, but is not limited thereto. For example, the lens attachment / detachment switch 257 is detected by communicating with a photoelectric detection switch or a CPU in the lens. In other words, any object that can detect the attached / detached state of the lens may be used.

Next, a flow of power-on reset when the power switch of the camera body is turned on will be described with reference to FIG. It is determined whether a power switch (not shown) of the camera body is turned on (S1). If the result of determination is that the power switch is off, processing advances to step S3 and a sleep state is entered. In this sleep state, interrupt processing is performed only when the power switch is turned on, and power switch-on processing in the next step S5 is performed. Until the power switch is turned on, operations other than power switch interrupt processing are stopped to prevent power consumption. In step S1, when the power switch is on, the process proceeds to step S5 to perform power switch on processing. In step S5, an initial value resetting operation such as various flags is performed for the electrical system of the camera body, and a resetting operation such as initial position setting is performed for the mechanical system.

When the power switch-on process is finished, it is next determined whether or not the live view mode is set (S7). It is detected whether or not the live view is set by various buttons for setting the display mode of the camera body. If the live view mode is not set, the process proceeds to the information display mode (S9), while the live view is set. If the mode is set, the process proceeds to the live view mode (S11). The information display mode is a mode in which shooting information and the like of the camera are displayed on the liquid crystal monitor 26, and the shooting information can be set and changed. The live view mode is a mode in which the subject image captured by the CCD 221 is displayed on the liquid crystal monitor 26.

When the information display mode or the live view mode ends, it is determined again whether or not the power switch is off (S13). If it is on, the process returns to step S7 to repeat the above steps. If the power switch is off, the process proceeds to step S15 to perform various processes for power off. At the time of power-off, setting is performed in the cam area b of the shutter charge cam 353 and the mirror charge cam 355.

Next, the flow of the live view display mode in step S11 will be described using FIG. When the live view mode is entered, first, photometry / exposure amount calculation is performed (S21). Here, since it is still in the cam region b (see FIG. 7) and the movable reflection mirror 201 is in the reflection position, the photometric element 211 measures a part of the subject light beam guided from the movable reflection mirror 201, and this photometry Based on the value, the body CPU 229 calculates an exposure value such as a shutter speed and an aperture value. Subsequently, initial setting for performing live view is performed (S22). In this initial setting, power is supplied to the CCD 221, live view display conditions are set in order to keep the brightness of the live view display on the liquid crystal monitor 26 appropriate, and the mirror up operation of the movable reflecting mirror 201 is also performed. The latter operation will be described later with reference to FIG. The live view is started in the live view initial setting.

Next, it is determined whether the release button 21 is half-pressed, that is, whether 1R is on (S23). If the result of determination is that it is on, processing advances to step S25, and an automatic focus adjustment (AF) subroutine is executed. In this subroutine, the subject image is displayed in live view on the liquid crystal monitor 26, and automatic focus adjustment and photometry are performed based on the image signal. In the automatic focus adjustment operation during live view, since the movable reflecting mirror 201 is retracted from the photographing optical path, contrast AF based on the output signal of the CCD 221 is performed instead of the automatic focus adjustment operation based on the output of the distance measuring circuit 217. . In this contrast AF, focusing driving is performed by a so-called hill-climbing method in which the position where the contrast value peaks from the output signal of the CCD 221 in cooperation with the lens CPU 111. This automatic focus adjustment and photometry operation are carried out through the cam area c to the cam area b, in which the movable reflection mirror 201 is lowered to the reflection position, and photometry is performed by the photometry element 211 and the sub mirror 203. A distance measuring operation is performed by the distance measuring circuit 217 based on the subject luminous flux guided by the step, and when the automatic focus adjustment is finished, the cam region c may be returned to the cam region d.

When the automatic focus adjustment (AF) in step S25 ends, it is subsequently determined whether or not the release button 21 has been fully pressed, that is, whether or not 2R is on (S27). As a result of the determination, if 2R is on, the process proceeds to step S29, and the photographing operation is executed. This photographing operation subroutine will be described later with reference to FIG. When the shooting operation is completed, the process returns to the initial setting of the live view in step S22, and the above steps are repeated. Returning to step S27, if 2R is off, the process proceeds to step S31 to determine whether 1R is on. If the release button 21 is half-pressed but not fully pressed, a standby state is made in which the determinations in steps S27 and S31 are made. When the photographer's hand is released from the release button 21, the process returns to step S23 and the above steps are repeated.

Returning to step S23, if 1R is OFF, the process proceeds to step S33, and the operation button (not shown) is switched from display mode switching, that is, display of the subject image in the live view to optical display in the viewfinder optical system. To determine whether or not the switch has been made. If the display mode is switched as a result of the determination, in step S35, in order to stop the live view display of the subject image on the liquid crystal monitor 26, processing such as power supply stop of the CCD 221 is performed. The live view display is started in the initial setting of the live view in step S22, and until the live view display is stopped in step S35, the liquid crystal monitor 26 continuously displays the image data repeatedly acquired by the CCD 221. Live view display is made. Subsequently, in step S37, the shutter 213 and the movable reflecting mirror 201 are initialized. In the live view, the movable reflection mirror 201 is moved to the up position (reflection position), but the subject image is observed with the optical finder, and the liquid crystal monitor 26 displays the shooting information. This is a process for returning. In this initialization, the MS motor 301 is driven until the aforementioned mirror charge cam 353 and shutter charge cam 355 reach the cam region b.

Returning to step S33, if the display mode has not been switched, the process proceeds to step S41, where the state of the lens attachment / detachment detection switch 257 is detected to determine whether or not the taking lens has been detached. If the result of determination is that the lens has been removed, the process proceeds to step S43 to perform lens removal processing. Since the shutter 213 is a normally open type, there is no possibility that a member that covers the CCD 221 disappears when the taking lens is removed, and dust or the like may be attached, and the CCD 221 is directly exposed to the outside world. From the meaning, the shutter 213 is closed and the movable reflecting mirror 201 is lowered. When the lens detachment process is completed, the process returns to step S23 and the above steps are repeated.

Returning to step S41, if the taking lens is not detached, it is determined whether the taking lens is attached by detecting the state of the lens attachment / detachment detection switch. If the result of determination is that a photographic lens has been attached, processing proceeds to step S47 and lens attachment processing is performed. As described above, when the lens is removed, the shutter 213 is closed, but when the photographing lens is attached, the shutter 213 is opened. When the lens mounting process ends, the process returns to step S22, and the above steps are repeated.

Next, the live view initial setting in step S22 will be described in detail with reference to the flowchart shown in FIG. 11 and the time chart shown in FIG. Before performing live view, the mirror charge cam 353 and the shutter charge cam 355 are in the cam area b (standby area), and when the live view is initialized, the MS motor 301 enters the cam gear 357 in the cam area d that performs live view. Drive. First, the MS motor 301 is rotated to drive the mirror charge cam 353 and the shutter charge cam 355 from the cam area b to the cam area c (S51). During this time, the mirror drive lever 341 moves from the position of FIG. 2B toward the position of FIG. 2C, and the movable reflecting mirror 201 is moved to the up (retracted) position by the spring force of the mirror drive spring 343. Rotate. Further, since the cam surface 355S of the shutter charge cam 355 does not change and remains at the top dead center, it remains at the position shown in FIGS. 2A and 2A and maintains the shutter charge state. When reaching the d region, the MS detection rises from the L level to the H level (S53), and the rotation of the MS motor 301 is stopped in response to the rise signal (S55). As a result, the movable reflecting mirror 201 is in the up (retracted) position, and the shutter 213 remains in the shutter charge state. As described above, since the shutter 213 is a normally open shutter, the shutter 213 remains open in a normal state, and no shutter opening operation for performing live view is particularly necessary.

In this state, since the movable reflecting mirror 201 is in the retracted position and the shutter 213 remains open, a subject image is formed on the CCD 221, and image information is read from the CCD 221 as an imager. Start (S57). Based on the read image information, live view display is performed on the liquid crystal monitor 26 (S59). In order to perform live view display, image information is repeatedly read from the CCD 221 (for example, 30 frames / second) and displayed as a moving image.

Next, the photographing operation in step S29 will be described in detail using the flowchart shown in FIG. As described above, this subroutine acquires a still image based on the output from the CCD 221 and records it on the recording medium 245 when the release button 21 is fully pressed during live view. The live view is performed in the cam area d. When moving to the shooting operation, the front curtain and rear curtain magnets of the shutter 213 are attracted and held, and then the mirror charge cam 353 and the shutter charge cam 355 are directly placed in the cam area e. What is necessary is just to drive. As described above, since the shutter 213 is a normally open type, it is in a shutter open state, and therefore is temporarily closed for exposure time control. Further, since the movable reflecting mirror 201 is at the retracted position, it is sufficient that the position is maintained.

First, power is supplied to the shutter front curtain and rear curtain holding magnet Mg to hold the front curtain and rear curtain (S71). Thereafter, driving of the MS motor 301 is started (S73). By this drive, the drive starts from the cam area d toward the cam area e. Since the cam surface 353M of the mirror charge cam 353 does not change between the cam region d and the cam region e, the movable reflecting mirror 201 maintains the retracted position as it is, but the cam surface 355S of the shutter charge cam 355 is dead from the top dead center. The shutter front curtain changes from the open position to the closed position in response to the change. At substantially the same time, when the falling signal of the MS detection switch that detects the transition from the cam area d to the cam area e is detected (S75), the MS motor 301 stops driving (S77).

In this state, the movable reflecting mirror 201 is retracted from the photographing optical path, and the shutter 213 is ready for exposure, so that the photographing operation is started (S79). First, energization of the magnet Mg holding the shutter front curtain is stopped, and the travel of the shutter front curtain is started. When the time corresponding to the shutter speed calculated in advance or the manually set shutter speed has elapsed, the running of the shutter rear curtain is started. If the time for the trailing curtain to end after the shutter trailing curtain starts running, an instruction to read out the image signal is issued from the CCD 221 (S81). Subsequently, the MS motor 301 is driven (S82) to shift from the cam area e to the cam area a.

When moving from the cam area e to the cam area a, the cam surface 353M of the mirror charge cam 353 becomes a lift area, and the mirror charge lever 351 rotates to perform the charging operation of the movable reflecting mirror 201. When the cam region a is shifted to the cam region b and the lock of the second shutter charge lever 387 is released by the lock lever cam 381, the shutter set lever 213b moves from the reset position to the set position, and the shutter charge operation is performed. Do. Upon completion of the shutter charge operation, the shutter 213 changes from the closed state to the open state.

Subsequently, the C detection switch rises from the L level to the H level (S83), and when this rising signal is detected, the driving of the MS motor 301 is stopped (S84). In this state, since reading of the image signal from the CCD 221 is completed, image data based on the read image signal is recorded on the recording medium 245 (S85). When the shooting operation subroutine is completed, the process returns to the live view initial setting in step S22. In this subroutine, the cam area b is changed to the c area, and the live view is resumed.

Next, the operation of each member in the shooting operation will be described using the time chart shown in FIG. First, when the 2R switch is turned on, the photographing operation is started, the shutter front curtain travels (timing of t1), and the shutter rear curtain travels when the calculated exposure time or the manually set exposure time elapses (t2). Timing). The arrangement of the levers shown in FIG. 4 corresponds to this timing. When the travel of the shutter rear curtain is started, the passage of the time for which the shutter rear curtain travel ends is waited, and after that, reading of the image signal from the CCD 221 is started (timing of t3, S81). Therefore, at the time of reading out the image signal, the shutter 213 remains closed, and the subject light flux is not guided onto the CCD 221 and is read out in a light-shielded state.

Subsequently, the MS motor 301 is turned on and starts to drive from the cam area e toward the cam area a (timing t4, S82). As a result, the mirror charge cam 353 and the shutter charge cam 355 start to rotate. At this time, the movable reflecting mirror 201 starts moving from the retracted position toward the reflecting position by the rotation of the mirror charge cam 353, but the shutter lock lever 387 locks the second shutter charge lever 383 in the shutter set lever 213b. Therefore, the reset position ((A) in FIG. 2A) remains.

While the MS motor 301 is rotating, the reading of the image signal is finished (timing of t5), the lock lever cam 381 abuts on the shutter lock lever 387 in the cam area b, and the second shutter charge lever 383 and the shutter are locked. The engagement of the lock lever 387 is released, and the shutter set lever 213b is moved from the reset position to the set position (timing from t6 to t8). As a result, the shutter 213 is charged and changes from the closed state to the open state. After this, the MS motor 301 continues to rotate, detects the rising signal of C detection, and the rotation of the MS motor 301 stops (timing t9, S83, S84). The arrangement of the levers shown in FIG. 5 corresponds to the timing t5, and the arrangement of the levers shown in FIG. 6 corresponds to the timing t8.

In the information display mode in step S9, the standby area for observing the optical viewfinder subject image is used. In this case, when the release button 21 is fully pressed and 2R is turned on, the shooting operation may be performed by moving to the shooting area (cam area e) through the live view area (cam area d). The operation of each member at this time is shown in the time chart of FIG. Since the operation after entering the shooting area (cam area e) is the same as in the live view display mode, timings t1 to t9 are given.

As described above, in this embodiment, the readout of the image signal after imaging is performed with the shutter 213 closed, and the charging operation (opening operation) of the shutter 213 is performed after the completion of the readout. That is, the camera enters the cam area e where the photographing operation is performed, travels through the shutter front curtain and the rear curtain, and when the exposure operation is completed, reading of the image signal from the CCD 221 is subsequently started (timing t3). After the end of reading of the image signal (timing t5), the second shutter charge lever 383 is unlocked by the shutter lock lever 387, and the shutter 213 is charged (opening operation) (timing t6 to t6). t8).

As described above, in one embodiment of the present invention, the normal open type shutter 213 is used, and the readout of the image signal of the CCD 221 is started in the shutter closed state after the imaging operation is completed until the readout of the image signal is completed. The shutter charging operation, that is, the opening operation is prohibited. Therefore, it is possible to prevent a problem that subject light is incident on the image sensor during image reading and noise is generated.

In the present embodiment, since the shutter 213 is a so-called normal open shutter that is opened in a charged state, the shutter opening operation is not necessary when performing live view display, and the live view display is simplified. Can be done.

In this embodiment, the two cams, the mirror charge cam 353 and the shutter charge cam 355, are used. However, the present invention is not limited to this, and for example, the area is divided into one for mirror charge and one for shutter charge. Anyway. Further, the cam rotates only in one direction except for the reciprocating motion between the standby area (cam area b) and the live view area (cam area d), but the cam area d of the shutter charge cam 255 and the cam You may make it perform forward / reverse rotation by loosening the cam shape between the area | regions e. Furthermore, although the cam surface for performing the closing operation of the shutter front curtain is the live view area (cam area d), it can also be the shooting area (cam area e).

In this embodiment, the movable mirror 201 is a reflecting mirror having a half mirror at the center, and when performing live view display, the movable mirror 201 is retracted from the optical path of the photographing lens. For example, when the movable mirror is formed of a half mirror and live view display is performed, the subject luminous flux transmitted through the movable half mirror may be used. In this case, the cam area e that is the transition area of the mirror charge cam 353 and the cam area that is the live area may both be the top dead center cam area. By using a movable half mirror, it is possible to guide the subject light flux to the distance measuring / photometric sensor and the CCD, which is the image sensor, so that live view display is performed based on the CCD image signal and the output of the distance measuring / photometric sensor. It becomes possible to perform distance measurement and photometry in parallel. In the present embodiment, when performing distance measurement, driving from the live view area to the standby area has to be performed, but such driving is not necessary by using a half mirror.

Furthermore, in the present embodiment, the two cams of the mirror charge cam 353 and the shutter charge cam 355 are employed. However, the present invention is not limited to this, and for example, the area is divided into one for mirror charge and one for shutter charge. Anyway. Of course, a cam hole may be used instead of the cam surface.

Furthermore, in this embodiment, the image sensor is one of the CCDs 221, but it is needless to say that the present invention can also be applied to a camera that performs live view display by switching the outputs of a plurality of image sensors. Further, the movable reflecting mirror 201 switches the optical path between the finder optical system and the image sensor, but is not limited to this, and is configured to switch between, for example, an image sensor for image recording and an image sensor for object image observation. Of course, the present invention can be applied.

Further, in the present embodiment, the digital camera is capable of both the optical finder display and the moving image live view display. However, the present invention can also be applied to a camera that uses only the optical finder as a subject image display. That is, in a digital camera that employs a normally open shutter as a shutter, the image signal of a still image is acquired with the shutter closed, as in this embodiment, and the shutter charge of the normally open shutter is charged after the image signal is read out. And the shutter opening operation may be performed. Conversely, the present invention can also be applied to a digital camera with only a live view display that does not have an optical viewfinder display.

In the present embodiment, the present invention is applied to a general digital camera. However, the present invention is not limited thereto, and may be a digital camera in various devices such as a portable device, and may be attached to various devices such as a microscope and binoculars. Of course, the present invention can also be applied to a dedicated digital camera. The present invention can be applied to any digital camera that displays a shooting target on a monitor device in a live view.

2 is a block diagram illustrating a schematic configuration of an internal mechanism of a digital single-lens reflex camera according to an embodiment of the present invention, where (A) illustrates the internal configuration along the optical axis direction of the photographic lens, and (B) illustrates the camera body 200; FIG. It is a block diagram which shows the internal structure seen from the front direction. 1A and 1B are diagrams showing a shutter and a movable reflecting mirror of a digital single lens reflex camera according to an embodiment of the present invention, wherein FIG. 1A is a perspective view of the shutter, and FIG. 2B shows a mirror-down state of the movable reflecting mirror; (C) is a figure which shows the mirror up state of a movable reflective mirror. It is a disassembled perspective view of the shutter mirror drive unit of the digital single-lens reflex camera concerning one Embodiment of this invention. It is a top view which shows the lever state in the exposure position of the shutter mirror drive unit of the digital single-lens reflex camera concerning one Embodiment of this invention. It is a top view which shows the lever state just before completion of shutter charge of the shutter mirror drive unit of the digital single-lens reflex camera concerning one Embodiment of this invention. It is a top view which shows the lever state after the shutter charge completion of the shutter mirror drive unit of the digital single-lens reflex camera concerning one Embodiment of this invention. It is an expanded view of the cam area | region of the digital single-lens reflex camera concerning one Embodiment of this invention. 1 is a block diagram mainly showing an overall configuration of an electric system of a digital single-lens reflex camera according to an embodiment of the present invention. It is a flowchart of the power-on reset of the digital single-lens reflex camera in one Embodiment of this invention. It is a flowchart of the live view display of the digital single-lens reflex camera in one Embodiment of this invention. It is a flowchart of the live view initial setting of the digital single-lens reflex camera in one Embodiment of this invention. It is a time chart in the live view initial setting of the digital single-lens reflex camera in one Embodiment of this invention. 5 is a flowchart of a photographing operation of a digital single lens reflex camera according to an embodiment of the present invention. 6 is a time chart at the time of shooting with a digital single-lens reflex camera according to an embodiment of the present invention (shooting from a live view display). 6 is a time chart at the time of shooting (shooting from information display) of the digital single-lens reflex camera according to the embodiment of the present invention.

Explanation of symbols

21 Release button 26 LCD monitor 33 Viewfinder 100 Lens barrel 200 Camera body 201 Movable reflection mirror 203 Sub mirror 213 Focal plane shutter 213b Shutter set lever 221 CCD
229 Body CPU
279 CCD in the viewfinder
227 Image processing circuit 285 CCD switching circuit 301 MS motor 303 Shutter / mirror drive unit 341 Mirror drive lever 351 Mirror charge lever 353 Mirror charge cam 355 Shutter charge cam 357 Cam gear 361 First shutter charge lever 381 Lock lever cam 383 Second shutter charge Lever 387 Shutter lock lever 389 Coil spring

Claims (12)

Imaging means capable of photographing the light flux from the photographing optical system;
A reflecting member movable between an insertion state capable of reflecting the light beam from the photographing optical system and a retracted state retracted from the light beam from the photographing optical system;
A shutter unit that is disposed between the imaging optical system and the imaging unit and is open in a charged state;
A first lever capable of driving the reflecting member;
A second lever member capable of driving the shutter unit;
A third lever member capable of locking the second lever member;
A cam member capable of transmitting power to the first lever member and the second lever member;
Comprising
A camera comprising a cam member configured to allow the third lever member to be unlocked only in a state where image data reading of the imaging unit is completed. 2. The camera according to claim 1, wherein the third lever member can be unlocked only in a state in which a driving force to the second lever member is charged by the cam member. 3. Imaging means capable of photographing the light flux from the photographing optical system;
A reflecting member movable between an insertion state capable of reflecting the light beam from the photographing optical system and a retracted state retracted from the light beam from the photographing optical system;
A shutter unit that is disposed between the imaging optical system and the imaging unit and is open in a charged state;
A cam member configured by the reflection member, a first cam section that drives the shutter unit and is used before exposure, and a second cam section that is used after exposure;
A lever mechanism capable of accumulating shutter unit driving force from the cam member;
Comprising
A camera that performs shutter charging by accumulating the driving force of the shutter unit in a second cam section and releasing it in the vicinity of the end of the second cam section when the accumulation is completed. 4. The camera according to claim 3, wherein the shutter unit is in an open state in a charged state and is in a light-shielding state in an exposure operation completion state. Imaging means capable of photographing the light flux from the photographing optical system;
A reflecting member movable between an insertion state capable of reflecting the light beam from the photographing optical system and a retracted state retracted from the light beam from the photographing optical system;
A shutter unit that is disposed between the imaging optical system and the imaging unit and is open in a charged state;
A first lever member capable of driving the reflecting member;
A second lever member capable of driving the shutter unit;
A third lever member capable of locking the second lever member;
A cam member capable of transmitting power to the first lever member and the second lever member;
Comprising
The camera according to claim 3, wherein the third lever member can be unlocked only in a state where a driving force to the second lever member is charged by the cam member. Imaging means capable of photographing the light flux from the photographing optical system;
A shutter unit that is disposed between the imaging optical system and the imaging unit and is open in a charged state;
A cam member configured to drive a reflecting member and the shutter unit and include a first cam section used before exposure and a second cam section used after exposure;
A lever mechanism capable of accumulating shutter unit driving force from the cam member;
Comprising
A shutter charge is performed by accumulating the driving force of the shutter unit in the second cam section, and releasing in the vicinity of the end of the second cam section in the accumulation completed state. Imaging means for receiving a subject luminous flux that has passed through the photographing lens and outputting a subject image signal;
A shutter unit disposed between the photographic lens and the imaging means and in an open state in a charged state;
A driving force transmitting member for transmitting a charge driving force to the shutter unit in order to set the charging state after the exposure operation by the imaging means is completed;
A driving force accumulating member for accumulating the charge driving force until reading of the subject image signal from the imaging means is completed;
A charge member that charges the shutter unit via the driving force transmission member by the charge driving force accumulated in the driving force accumulation member after the reading of the subject image signal;
A camera comprising:   The camera according to claim 7, wherein the driving force transmission member includes a cam and a lever member engaged with the cam, and the driving force accumulation member includes an elastic member.   A reflection mirror disposed between the photographing lens and the shutter unit and capable of changing an optical path of a subject luminous flux that has passed through the photographing lens; and the driving force transmitting member transmits a driving force to the reflecting mirror. The camera according to claim 7.   8. The camera according to claim 7, further comprising monitor means for performing live view display as a moving image based on the subject image signal read from the imaging means. Imaging means for receiving a subject luminous flux that has passed through the photographing lens and outputting a subject image signal;
A shutter unit disposed between the photographic lens and the imaging means and in an open state in a charged state;
A driving force transmitting member for transmitting a charge driving force to the shutter unit to bring the shutter unit into a charged state;
A driving force transmission prohibiting member that prohibits transmission of the charge driving force to the shutter unit until reading of the subject image signal from the imaging means is completed;
A camera comprising:   While the transmission of the charge driving force is prohibited by the driving force transmission prohibiting member, the driving force storing member accumulates the charge driving force and accumulates in the driving force accumulation member after the reading of the subject image signal is completed. The camera according to claim 11, wherein the shutter unit is charged by the charged driving force.