JP2007312198A - Live view capable camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a live view capable camera for preventing dust or the like from adhering to an imaging element or the like when an interchangeable lens is removed from a camera main body when adopting a normally open type shutter. <P>SOLUTION: A mirror charge cam 353 and a shutter charge cam 355 consist of: a lens removable region (cam region b) for keeping the normally open type shutter 213 to a closing state and holding a moving reflection mirror 201 to a reflection position; a standby region (camera region d) for keeping the shutter 213 to an open state and a charge completion state and locating the moving reflection mirror 201 to the reflection position; a live view region (cam region f) for keeping the shutter 213 to the open state and the charge completion state and locating the moving reflection mirror 201 to a save position; and a photographing region (cam region g) wherein the exposure time of the shutter can be controlled and for locating the moving reflection mirror to the save position. <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.

Such a live view display function is effective, for example, at the time of macro photography because no parallax occurs. For this reason, various examples mounted on a digital single lens reflex camera have been proposed. For example, the optical viewfinder display mode and the electronic viewfinder display mode can be selected. When the electronic viewfinder display mode is selected, 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. A digital single-lens reflex camera capable of live view has been proposed in which a subject image obtained thereby is continuously displayed on a liquid crystal monitor disposed outside (Patent Document 1).
JP 2002-369042 A

By the way, in order to perform live view display, it is necessary to fully open the shutter. Conventionally, since a normally closed type shutter has been adopted, an operation such as shutter charging must be performed during shooting. There was a problem that the time lag became slow. In order to solve this problem, it is conceivable to adopt a normally open type shutter in which the shutter is opened in a normal state. In this case, when the interchangeable lens is removed from the camera body, the shutter is Since it is open, there has been a problem that external dust or the like may adhere to the image sensor or the like through the mount opening.

The present invention has been made in view of such circumstances, and provides a live viewable camera that prevents dust and the like from adhering to an image pickup device or the like when a lens is detached from the camera body. For the purpose.

In order to achieve the above object, the live viewable camera to which the interchangeable lens according to the first aspect of the invention can be attached moves to the imaging device, the reflection position for reflecting the subject light flux, and the retreat position for retreating from the subject light flux. A reflection mirror, a shutter disposed between the reflection mirror and the image sensor, and capable of running on a pair of shutter curtains when charged; the shutter in the shutter curtain open state when fully charged; and the image sensor Display means for displaying an image formed, lens detection means for detecting the mounting state of the interchangeable lens, and a cam member for driving the shutter to charge, the shutter being held in an uncharged state. Shutter cam means comprising a first region, a second region for holding the shutter in an open state in a fully charged state, and the reflecting mirror Mirror cam means comprising a third area positioned at the shooting position and a fourth area where the reflecting mirror is positioned at the retracted position, and an image formed on the image sensor is displayed on the display means for live view. In this state, the reflecting mirror is positioned at the retracted position by the fourth area of the mirror cam means, and the shutter is positioned at the charge completion state by the second area of the shutter cam means in synchronization with this. When the shutter curtain is controlled to be in an open state and it is detected that the interchangeable lens has been detached, the reflecting mirror is positioned at the reflecting position by the third region of the mirror cam means, Control means for controlling the shutter cam means to maintain the closed state by the first region is provided.

According to a second aspect of the present invention, in the first aspect of the invention, the shutter cam means further includes a fifth region for holding the shutter in a charged state, and the mirror cam means further includes the reflection camera. In the normal mode in which the subject light beam reflected by the reflection mirror is displayed by the finder optical system, the control means causes the reflection mirror to be moved by the sixth area of the mirror cam means. Control is performed so that the shutter is held in the charging completion state by the fifth region of the shutter cam means in synchronization with the reflection position.
According to a third aspect of the present invention, in the first aspect of the invention, the shutter cam means further includes a seventh region in which the shutter is in a chargeable state so that the shutter can travel. The means further includes an eighth area positioned at the retracted position, and the control means is configured to capture the reflection mirror by the eighth area of the mirror cam means in a photographing mode for recording the image data acquired by the image sensor. Is positioned at the retracted position, and the exposure time by the shutter is controlled by the seventh region of the shutter cam means in synchronism with this.
Further, the camera capable of live view according to the fourth invention is the camera according to the first invention, wherein the shutter cam means further keeps the shutter uncharged continuously before the first area. The mirror cam means further includes a tenth area for driving the reflecting mirror from the retracted position to the reflecting position continuously before the third area, and the control means. Is driven to move the reflecting mirror from the retracted position to the reflecting position by the tenth area of the mirror cam means when the power is turned off, and the shutter is not charged by the ninth area of the shutter cam means. Control to keep the state.

Furthermore, the camera capable of live view according to a fifth aspect of the present invention is the camera according to the first aspect, wherein the shutter cam means further includes an eleventh region for performing the shutter charging operation continuously following the first region. And the mirror cam means further includes a twelfth area for continuously positioning the reflection mirror at the reflection position following the third area. The reflection position of the reflection mirror is held by 12 areas, and the shutter is controlled to perform the charging operation of the shutter by the 11th area of the shutter cam means.
Further, the camera capable of live view according to a sixth aspect of the present invention is the camera according to the first aspect, wherein the shutter cam means further includes a thirteenth area for holding the shutter charge completion state before the second area. The mirror cam means further includes a fourteenth area for driving the reflection mirror from the reflection position to the retracted position before the fourth area, and the control means performs the live view. The shutter holds the shutter charge completion state by the thirteenth area of the shutter cam means, and in synchronization with this, the reflection mirror is positioned from the reflection position to the retracted position by the fourteenth area of the mirror cam means. To control.
Furthermore, in the camera capable of live view according to the seventh invention, in the sixth invention, the fourteenth area of the mirror cam means forms a cam surface so that it can be driven in either forward or reverse direction.
Furthermore, in the camera capable of live view according to the eighth invention, in the first invention, the mirror cam means and the shutter cam means rotate together.
Furthermore, in the camera capable of live view according to the ninth invention, in the first invention, the mirror cam means and the shutter cam means are constituted by an integral cam member.
Further, the camera capable of live view according to the tenth aspect of the present invention is the camera according to the first aspect, wherein the drive control means positions the movable reflection mirror at the reflection position and closes the front curtain of the shutter during photographing. Once it is driven to the state, the opening operation is performed.

In order to achieve the above object, a live viewable camera according to an eleventh aspect of the present invention is a movable reflecting mirror movable to a reflection position on a photographing optical path of a photographing lens and a retracted position retracted from the photographing optical path, An image sensor that is disposed on the photographing optical path of the photographing lens, receives a subject image formed by the photographing lens, and outputs a photoelectric conversion signal, and is disposed between the image sensor and the movable reflecting mirror, At the time of shooting, a normally open type shutter for controlling the exposure time of the subject image on the image sensor, a display device for live view display of the subject image based on the photoelectric conversion signal, and the separation of the interchangeable lens When the live view display is performed with the lens detachment detecting means for detecting the shutter, the shutter is kept in the open state when the charging is completed. When the movable reflection mirror is driven to the reflection position, and the separation of the interchangeable lens is detected by the lens separation detection means, the shutter is driven to a closed state and the movable reflection mirror is driven to the reflection position. And a drive control means having a cam mechanism.

According to a twelfth aspect of the present invention, in the camera according to the eleventh aspect, the cam mechanism of the drive control means includes a mirror cam mechanism for driving the movable reflecting mirror. A lens separation area and a live view area are formed on the cam surface. The lens separation area is a cam surface for positioning the movable reflection mirror at the reflection position. The live view area is the movable reflection area. It is a cam surface for positioning the mirror at the retracted position.
The camera capable of live view according to the thirteenth aspect of the present invention is the camera according to the twelfth aspect, wherein the movable reflecting mirror is driven from the retracted position to the reflecting position in front of the cam surface in the lens separation area of the mirror cam mechanism. A lift surface is formed.
Further, the camera capable of live view according to the fourteenth aspect of the present invention is the camera according to the eleventh aspect, wherein the cam mechanism of the drive control means has a shutter cam mechanism for driving the shutter. A lens separation area and a live view area are formed on the cam surface. The lens separation area holds the shutter in an uncharged state, and the live view area holds the shutter in a charged state.
Furthermore, the camera capable of live view according to the fifteenth aspect of the present invention is the camera according to the fourteenth aspect, wherein a lift surface for charging the shutter is formed on the cam surface following the cam surface in the lens detachment region of the shutter cam mechanism. .

In order to achieve the above object, a camera capable of live view according to the sixteenth aspect of the present invention has a reflection position for entering and reflecting the light beam from the photographing lens, and a retreat position for retreating from the light beam passage area from the photographing lens. A movable reflection mirror driven by the lens, a normally open type shutter disposed behind the movable reflection mirror, and an object image formed by the photographing lens that is disposed on the photographing optical path of the photographing lens. An image sensor that outputs a photoelectric conversion signal, a display device for live-view display of the subject image based on the photoelectric conversion signal, a lens detachment detection unit that detects detachment of the interchangeable lens, and an interchangeable lens of the camera The movable reflection mirror is positioned at the reflection position when detached and the shutter is closed, and the live view is displayed when the live view is displayed. Positions the moving reflecting mirror in the retracted position and having a control means for the charging completion state the shutter.
The camera capable of live view according to a seventeenth aspect of the present invention is the camera according to the sixteenth aspect, wherein the control means drives the movable reflecting mirror from the retracted position to the reflective position and attaches the lens when the lens is detached. Sometimes the shutter is charged.
According to an eighteenth aspect of the present invention, in the camera according to the sixteenth aspect, the control means further includes the movable reflecting mirror in the normal mode in which the subject image is observed with an optical finder. The shutter is positioned at the reflection position, and the shutter is held in the charge completed state.
Furthermore, the camera capable of live view according to the nineteenth aspect of the present invention is the above eighteenth aspect, wherein the control means can reversibly switch between the normal mode and the live view display.
In order to achieve the above object, a live viewable camera according to the twentieth aspect of the invention is provided with a reflection position for entering and reflecting the light flux from the photographing lens, and a retreat position for retreating from the light flux passage area from the photographing lens. A movable reflection mirror driven by the lens, a normally open type shutter disposed behind the movable reflection mirror, and an object image formed by the photographing lens that is disposed on the photographing optical path of the photographing lens. An image sensor that outputs a photoelectric conversion signal, a display device for live view display of the subject image based on the photoelectric conversion signal, and the movable reflecting mirror when the opening of the camera is in an open state. Control means for placing the shutter in the closed position is provided at the reflection position.

In the camera capable of live view according to the present invention, when the photographing lens of the camera is detached, the movable reflecting mirror is positioned at the reflection position and the shutter is closed. It is possible to provide a camera capable of live view that is prevented from adhering.

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 illustrating a schematic configuration of an internal mechanism of a digital single-lens reflex camera according to an embodiment. FIG. 1A is a block diagram illustrating an internal configuration along the optical axis direction of a photographing lens, and FIG. FIG. 3 is a block diagram of an internal configuration viewed from the front side of a main body 200.

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. 6) 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. 6) 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 the present embodiment, total reflection is performed upward. However, the present invention is not limited to this, and the reflection direction of the subject luminous flux is most appropriate in terms of the arrangement of the mechanism members and optical members, regardless of whether the camera body is on the right side or the left side. You may choose to

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. Further, a distance measuring unit 218 including a TTL phase difference type distance measuring circuit 217 (see FIG. 6) 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. 6) 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.
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 beside the movable reflecting mirror 201.

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 the shutter 213 and the movable reflecting mirror 201, where FIG. 2A is a perspective view of the shutter 213, FIG. 2B is a front view of the shutter 213, and FIG. 2C is a perspective view of the mirror. ) Shows the mirror-down state of the movable reflecting mirror 201, and (E) shows the 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 (a) indicated by the oblique line in FIG. 2B, and in the shutter charge completed state, the shutter set lever 213b is in the position indicated by the solid line (A) in FIG. Moving.

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 a position opened with respect to the movable reflecting mirror 201 as shown in FIG. As shown in FIG. 2 (D), a mirror down spring 345 is provided on the rotating shaft side of the movable reflecting mirror 201, and this mirror down spring 345 is attached 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 in the position shown in FIG. In this state, when the mirror charge lever 351 that locks the mirror drive lever 341 moves to the right, the mirror drive lever 341 rotates counterclockwise by the biasing force of the mirror drive 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, the mirror charge lever 351 moves to the left against the urging force of the mirror drive spring 343 and reaches the position shown in FIG.

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 the gear 363. A mirror charge cam 353 having a circumferential surface 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 one end of the mirror charge lever 351 is provided on the cam surface 353a of the mirror charge cam 353. 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 FIG. 2), one end of the mirror charge lever 351 is in pressure contact with the mirror charge cam 353. Become. Accordingly, as the cam gear 357 rotates, the mirror charge cam 353 integrated with the cam gear 357 rotates, and the mirror charge lever 351 pressed against the cam surface of the mirror charge cam 353 rotates.

A cam surface 355a of a shutter charge cam 355 having a circumferential surface 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 shutter charge cam 355 includes a shutter charge lever 361. One end is engaged. The other end of the shutter charge lever 361 is in contact with the shutter set lever 213b. Accordingly, as the cam gear 357 rotates, the shutter charge cam 355 integrated therewith also rotates, and the shutter charge lever 361 engaged with the cam surface of the shutter charge cam 355 rotates, and the shutter set lever 213b. Also rotate.

4A shows the cam surface of the mirror charge cam 353 viewed from the AA direction, and FIG. 4B shows the cam surface of the shutter charge cam 355 viewed from the BB direction. The cam surface 353a of the mirror charge cam 353 includes a lift cam a, a top dead center region b, a top dead center region c, a top dead center region d, a reverse lift cam e, a bottom dead center region f, a bottom dead center, as illustrated. It consists of seven areas, the point area g. The cam surface 355a of the shutter charge cam 355 includes a bottom dead center area a, a bottom dead center area b, a lift cam c, a top dead center area d, a top dead center area e, and a top dead center area f as shown in the figure. The bottom dead center region g is composed of seven regions. Note that the relative rotational positional relationship between the mirror charge cam 353 and the shutter charge cam 355 in FIG. 4 has been described with the same reference position, but the arrangement of the mirror charge lever 351 and the shutter char lever 361 indicates the mutual relationship. The reference position changes. Although not shown, a plurality of photo interrupters are provided for detecting the rotation or movement of the mirror charge cam 353, the shutter charge cam 355, or a member driven integrally with these. By these photo interrupters, d detection for outputting L level while in the region d, f detection for outputting L level while in the region f, and g detection for outputting L level while in the region a and region g. (See FIG. 5).

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, the movable reflecting mirror 201 is driven from the retracted position in FIG. 2E, and the mirror charge lever 351 is driven from the right to the left in FIG. The drive spring 343 is charged. Further, since the shutter charge cam remains at the bottom dead center, there is no change, the shutter 213 is in an incomplete charge state, and the shutter set lever 213b is in the position shown in FIGS.

The cam area b is a power-off area, the mirror charge cam 353 is at the top dead center, the movable reflecting mirror 201 is in the down state (see FIG. 2D), that is, the finder optical system reflects the subject light beam ( Reflective position). In this state, the subject luminous flux is guided to the finder optical system, so that the subject image can be observed by the optical finder. The shutter charge cam 355 is at the bottom dead center, and the shutter 213 is in an incomplete charge state. This power-off area is not limited to when the camera body is powered off, but is also used when the photographic lens is removed and the mount surface is in an open state.

The cam area c is a shutter charge area, the cam surface 355a of the shutter charge cam 355 changes from the bottom dead center to the top dead center, and the shutter set lever 213b is moved from the position shown in FIGS. B) Driven to the position shown in (a), the shutter charge incomplete state changes to the shutter charge complete state. On the other hand, the cam surface 353a 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 where the subject light beam is reflected by the finder optical system.

The cam area d is a standby area, the mirror charge cam 353 is at the top dead center, and the movable reflecting mirror 201 is in the down state (see FIG. 2D), that is, an observation position (reflection) that reflects the subject light beam to the finder optical system. Position). 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 guided to the photometric element 211 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 shutter charge area (cam area c), the shutter charge cam 355 is driven to the top dead center and is maintained in the cam area d, so that the charge completion state is obtained as shown in FIGS. It is in. 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. Since the shutter 213 is a normally-on type, the shutter 213 is in an open state. However, since the movable reflecting mirror 201 is in the down position, the subject light beam does not directly enter the CCD 221.

The cam area e is a reverse charge area, and is a transition area from a standby area (cam area d) where observation is performed by a finder optical system to a live view area (cam area f). In this region, the cam surface 353a of the mirror charge cam 353 changes from top dead center to bottom dead center, and the mirror charge lever 351 moves from the position shown in FIG. 2D to the position shown in FIG. 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 355a of the shutter charge cam 355 remains at the top dead center and remains unchanged, and the shutter charge completion state is maintained. 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 d and the area f, it is possible to drive the lens for repeated distance measurement and focusing.

The cam area f 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. 2E), that is, in the retracted position retracted from the photographing optical path. Further, 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.

The cam area g is an imaging area, the mirror charge cam 353 is at the bottom dead center, and the movable reflecting mirror 201 is in the up state (see FIG. 2E), that is, at 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. 2B and 2A, so that the shutter front curtain and the rear curtain can move to the retracted position. Yes. This state is when 2R is turned on by operating the release button 21, and the shutter front curtain and the rear curtain each run according to the release of the suction of the shutter magnet that holds the shutter 213, and during this time, the CCD 221 causes the still image to move. Can be imaged and recorded.

The mirror charge cam 353 and the shutter charge cam 355 rotate counterclockwise in the drawing (counterclockwise), 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 d) and can be observed with the optical viewfinder, and is driven to the cam area g according to the operation of the release button 21 to take a picture. 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 f), live view display is performed on the liquid crystal monitor 26, and the cam area g is displayed according to the operation of the release button 21. Driven to shoot.

Next, with reference to FIG. 6, an overall configuration mainly including an electric system of the digital single lens reflex camera will be described. 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 focus 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. 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 this step S5, initial values such as various flags are reset for the electrical system of the camera body, and reset operations such as initial position setting are performed for the mechanical system, but the shutter charge cam 353 and mirror charge cam 355 described above are performed. Set in the cam area d. The setting to the cam area d will be described later.

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. Observation of the subject image is performed by an optical viewfinder. 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. The setting to the cam area b will be described later.

Next, the flow of the live view mode in step S11 will be described with reference to 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 c (see FIG. 5) 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 (S2). 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 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, automatic focus adjustment and photometry are performed while the subject image is live-viewed on the liquid crystal monitor 26. This automatic focus adjustment and photometry operation are carried out through the cam area e to the cam area d, in which the movable reflecting mirror 201 is lowered to the reflection position, and the photometry is performed by the distance measuring element 211 and the sub mirror 203 is used. A distance measuring operation is performed by the distance measuring circuit 217 based on the guided subject light flux.

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 S2, and the above steps are repeated. Returning to step S7, 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, where the operation button <switches the display mode, that is, the display of the subject image in the live view to the optical display in the viewfinder optical system (not shown). It is determined whether or not switching has been performed. 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 area d.

Returning to step S33, if the display mode has not been switched, the process proceeds to step S41, where the state of a lens attachment / detachment detection switch (not shown) 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. Details will be described later. When the lens detachment process is completed, the process returns to step S22 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. Details will be described later. When the lens mounting process is completed, the process returns to step S23 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. Before performing live view, the mirror charge cam 353 and the shutter charge cam 355 are in the cam area d (standby area). When the live view is initialized, the MS motor 301 moves to the cam area e in which live view is performed. 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 shown in FIG. 2D toward the position shown in FIG. 2E, 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 355a of the shutter cam 355 does not change and remains at the top dead center, it remains at the position shown in FIGS. 2B and 2A and maintains the shutter charge state. When the region e is reached, b detection becomes L level (S53), and the rotation of the MS motor 301 is stopped (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 f, and when moving to the shooting operation, the front 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 g. 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 f toward the cam area g. Since the cam surface 353a of the mirror charge cam 353 is not changed between the cam region f and the cam region g, the movable reflecting mirror 201 maintains the retracted position as it is, but the cam surface 355a 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 approximately the same time, when the g detection switch for detecting the transition from the cam region f to the cam region g detects the L level (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 elapses, the running of the shutter rear curtain is started. After the shutter trailing curtain starts running, when the time to finish the trailing curtain has elapsed, the MS motor 301 is driven (S81), and the cam area g is shifted to the cam area d through the cam areas a, b, and c.

When moving from the cam area g to the cam area a, the cam surface 353a 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 area c is reached, the cam surface 355a of the shutter charge cam 355 becomes a lift area, and the shutter charge lever 361 rotates to charge the shutter 213. When entering the cam area d from the cam area c, the d detection switch detects the L level (S83), and the MS motor 301 stops driving (S85). When the photographing operation is finished in step S79, the image information of the still image is read from the CCD 221 and displayed on the liquid crystal monitor 26 for a predetermined time. When the photographing operation subroutine ends, the process returns to the live view initial setting in step S22, returns from the cam area d to the f area, and resumes the live view.

Next, the shooting operation in the normal mode (information display mode) in which live view is not performed, that is, the subject is observed with the optical viewfinder will be described with reference to the time chart of FIG. As described above, the observation of the subject image in the normal mode is performed in the cam area d, that is, the standby area. When the release button 21 is operated and 2R is turned on, a shooting operation is executed in the cam area g from the cam area d through the cam area e and the cam area f.

First, when the release button 21 is operated and 2R is turned on, the MS motor 301 starts driving (t1 in FIG. 15). When the cam region f is entered, the f detection switch becomes L level (t2 in FIG. 15), and the movable reflecting mirror 201 moves from the reflecting position to the retracted position. Further, the MS motor 301 continues to drive and turns on the shutter magnet just before the transition to the cam region g (t3 in FIG. 15). From this operation, the shooting operation in the live view is the same as the flowchart shown in FIG.

The shutter front curtain changes from the open position to the closed position as the shutter charge cam 355 rotates. When the g detection switch that detects the transition from the cam region f to the cam region g detects the L level, the MS motor 301 stops driving (t4 in FIG. 15). 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. First, the energization of the magnet Mg holding the shutter front curtain is stopped, and the travel of the shutter front curtain is started (t5 in FIG. 15). When the time corresponding to the shutter speed calculated in advance elapses, the running of the shutter rear curtain is started (t6 in FIG. 15). When the time for the trailing curtain to end after the shutter trailing curtain starts running, the MS motor 301 is driven (t7 in FIG. 15), and from the cam area g to the cam area a, the cam area b, and the cam area c. shift to d.

When the MS motor 301 is driven and the cam region g is shifted to the cam region a, the cam surface 353a of the mirror charge cam 353 becomes a lift region, and the mirror charge lever 351 rotates to perform the charging operation of the movable reflecting mirror 201. (T7 to t8 in FIG. 15). In the cam area b, the MS motor 301 continues to rotate (t8 to t9 in FIG. 15) and enters the cam area c. When moving to the cam area c, the cam surface 355a of the shutter charge cam 355 becomes a lift area, and the shutter charge lever 361 rotates to perform the charging operation of the shutter 213 (t9 to t10 in FIG. 15). When entering the cam area d from the cam area c, the d detection switch detects the L level (t10 in FIG. 15), and the MS motor 301 stops driving. After this, the live view is resumed.

Next, the power switch-off process in step S15 will be described with reference to FIG. In this subroutine, as described above, since the shutter 213 is a normally open type, it is closed when the power is turned off to protect the CCD 221. When this subroutine is entered, first, the MS motor 301 is rotated forward in order to move to the cam area b at the time of power-off (S91). Since the live view is performed in the cam area f, the MS motor 301 is driven to the cam area b through the cam area g and the cam area a. At this time, since the mirror charge cam 353 changes from the bottom dead center to the top dead center when passing through the cam area a, the movable reflecting mirror 201 is moved from the up position (retracted position) to the down position (reflective position) at this time. To drive. As a result, the movable reflecting mirror 201 is inserted between the shutter curtain and the camera body opening. For this reason, when the photographing lens is detached in the power-off state, sunlight does not directly enter the shutter curtain and burn out, and abnormal use from the outside can be prevented.

When the movable reflecting mirror 201 is driven to the down position and reaches the cam area b, the g detection rises from the L level to the H level. When this is detected (S93), the MS motor 301 stops rotating (S95). ). In this state, no subject image is formed on the CCD 221 and the camera body is also in a power-off state, so the display of the subject image on the liquid crystal monitor 26 is stopped (S97). The description of the flow in FIG. 11 was when the power was turned off during live view. However, in the information display mode in which the subject image is displayed using the optical viewfinder, the start point is only in the cam area d. The flow of FIG. 11 can be used as it is.

Next, the power switch-on process in step S5 will be described with reference to FIG. As described above, when the power is turned off, the shutter 213 is closed regardless of the normal open type shutter. Therefore, when the power is turned on, the shutter 213 is opened and the shutter charging operation is performed. When this subroutine is entered, first, the MS motor 301 is driven in the forward direction toward the standby area (cam area d) in which the information display mode is performed (S101). As described above, it is in the cam area b when the power is turned off, and the information display mode is set to the initial state when the power is turned on.

When the cam region b is entered from the cam region b by driving by the MS motor 301, the cam surface 353a of the mirror charge cam 353 remains at the top dead center, but the cam surface 355a of the shutter charge cam 355 remains at the bottom dead center. The shutter charge operation is performed simultaneously with opening the shutter 213. When the cam region d is entered and the d detection detects the L level (S103), the forward rotation drive of the MS motor 301 is stopped (S105). In this state, the movable reflection mirror 201 is in the down position, that is, the reflection position, and the shutter 213 is in the open state and the shutter charge completion state. Since the initial setting of the shutter 213 and the movable reflection mirror 201 is completed, display of information display is started (S107). In this embodiment, the information display mode is set to the initial setting state, but the live view can also be set to the initial setting state. In this case, when the f detection becomes the L level in step S103, the MS motor is set. 301 may be stopped.

Next, the lens detachment process in step S43 will be described with reference to FIG. When the photographic lens is removed from the camera body, the normal open type shutter 213 cannot cover the CCD 221, so that dust or the like may adhere to the CCD 221 or the like. Therefore, in this embodiment, when it is detected that the taking lens is removed, the shutter 213 is closed by moving to the cam area b that is the power-off area and also the lens separation area. ing. When this subroutine is entered, communication with the lens CPU 111 is first stopped (S111). Since the live view is executed in the cam area f, the MS motor 301 starts normal rotation driving toward the cam area b (S113).

In the middle of the cam region a, the cam surface 353a of the mirror charge cam 353 changes from the bottom dead center to the top dead center, so that the movable reflecting mirror 201 is driven from the retracted position (up position) to the reflecting position (down position). . As a result, when the movable reflecting mirror 201 is inserted between the shutter curtain and the camera body opening and the photographing lens is detached, the sunlight does not directly enter the shutter curtain and burn out, and abnormal from the outside. The fact that it can be prevented from being used is the same as in the case of the power-off process.

When the cam region b is reached, the g detection rises from the L level to the H level, and when this is detected (S115), the MS motor 301 stops rotating (S117). In this state, the subject image is not formed on the CCD 221 and the display of the subject image on the liquid crystal monitor 26 is stopped. The flow in FIG. 13 was described when the power was turned off during live view. However, in the information display mode in which the subject image is displayed on the optical viewfinder, the start point is only in the cam area d. As in the case of the power-off process, the flow of FIG. 13 can be used as it is.

Next, the lens mounting process in step S47 will be described with reference to FIG. As described above, when the lens is detached, the shutter 213 is closed regardless of the normal open type shutter. Therefore, when the lens is mounted, the shutter 213 is opened and the shutter charging operation is performed. When this subroutine is entered, it is first determined whether or not the taking lens is attached based on the output of the lens attaching / detaching switch 257 (S121). If attached, the process returns to the original flow. On the other hand, if not mounted, the process proceeds to step S123, and the MS motor 301 is driven to rotate forward toward the standby area (cam area d).

When the MS motor 301 is driven to enter the cam region c from the cam region b, the cam surface 353a of the mirror charge cam 353 remains at the top dead center, but the cam surface 355a of the shutter charge cam 355 remains at the bottom dead center. The shutter charge operation is performed simultaneously with opening the shutter 213. When the cam region d is entered and the d detection detects the L level (S125), the forward rotation drive of the MS motor 301 is stopped (S127). In this state, the movable reflection mirror 201 is in the reflection position, and the shutter 213 is in the open state and the shutter charge completion state, as in the power-on process. When the lens mounting subroutine is completed, the process returns to the above-described live view display mode routine, and the live view initial setting in step S22 is executed to drive the live view area (cam area f). Resume the view.

As described above, in the embodiment of the present invention, the normally open type shutter 213 is used, and the power-off region (cam region b) is provided on the cam surface 353a of the shutter charge cam 353 and the cam surface 355a of the mirror charge cam 355, respectively. Since the live view area (cam area f) and the shooting area (cam area g) are provided, the shutter charge 355 is driven in the power-off area when the power is turned off, and the shutter 213 on the front side of the image sensor (CCD 221) is closed. The image sensor can be protected from dust and the like. Further, when the power is turned off, the mirror charge cam 353 is driven, and the movable reflective mirror 201 on the front side of the image sensor (CCD 221) is set to the down position (reflection position), so that the image sensor (CCD 221) can be protected. The shutter 213 can be prevented from being burned out by sunlight or the like, and abnormal use from the outside can be prevented.

In the embodiment of the present invention, when the power is turned on, the shutter charge cam 255 is driven from the power-off area to the standby area to perform the opening operation of the shutter 213 and the shutter charge operation. It is easy to shift to, and the photographing operation can be performed quickly.

Furthermore, in one embodiment of the present invention, when the photographic lens is detached, the shutter charge 355 is driven to the power-off area and the shutter 213 on the front side of the image sensor (CCD 221) is closed, so Similarly, the image sensor can be protected from dust and the like. When the photographing lens is detached, the mirror charge cam 353 is driven and the movable reflecting mirror 201 on the front side of the image sensor (CCD 221) is set to the down position (reflection position). In addition to being able to protect, the shutter 213 can be prevented from being burned out by sunlight or the like, and abnormal use from the outside can be prevented.

Furthermore, in the embodiment of the present invention, when the photographic lens is mounted, the shutter charge cam 255 is driven from the power-off area to the standby area to perform the shutter 213 opening operation and shutter charging operation. It is easy to shift to, and the photographing operation can be performed quickly.

In the embodiment of the present invention, the two cams of the mirror charge cam 353 and the shutter charge cam 355 are used. However, the present invention is not limited to this. For example, a single cam can be used for mirror charging and shutter charging. You may make it divide into. In addition, the cam rotates only in one direction except for the reciprocation between the standby area (cam area d) and the live view area (cam area f), but the cam area f 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 g. Furthermore, although the cam surface for performing the closing operation of the shutter front curtain is the live view area (cam area f), it can also be the shooting area (cam area g).

In one embodiment of the present invention, the movable reflecting mirror 201 is driven to the reflecting position and the shutter 213 is closed in the power-off region when the power is turned off or when the lens is detached, but both are not performed. Even if the mirror 201 is driven to the reflection position and the shutter 213 is opened, or the movable reflection mirror 201 is driven to the retracted position and the shutter 213 is closed, the CCD 221 or the like is not as in this embodiment. Therefore, it is possible to protect only one of them. In this case, the cam surface 353a of the mirror charge cam 353 and the cam surface 355a of the shutter charge cam 355 may be appropriately modified.

In this embodiment, the image sensor is one of the CCDs 221, but it is needless to say that the present invention can 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. Furthermore, in the present embodiment, the movable reflecting mirror 201 performs mirror charging when the mirror is raised, but conversely, mirror charging may be performed when the mirror is down. Furthermore, in the present embodiment, the camera performs live view. However, the present invention is not limited to this, and the present invention can be applied to any camera that employs a normally open type shutter even when observing a subject image with an optical viewfinder.

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; 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, FIG. 1B is a front view of the shutter, and FIG. FIG. 4D is a perspective view of the reflection mirror, FIG. 4D is a view showing a mirror-down state of the movable reflection mirror, and FIG. It is a partial detail drawing of the shutter mirror drive unit of the digital single-lens reflex camera concerning one Embodiment of this invention. 2A and 2B are diagrams illustrating a cam area of a digital single-lens reflex camera according to an embodiment of the present invention, where FIG. 3A illustrates a mirror charge cam, and FIG. 2B illustrates a cam area of a shutter charge cam. 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. 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 flowchart of power switch-off processing of the digital single-lens reflex camera according to the embodiment of the present invention. 4 is a flowchart of power switch-on of the digital single-lens reflex camera according to the embodiment of the present invention. It is a flowchart of the lens detachment process of the digital single-lens reflex camera in one Embodiment of this invention. It is a flowchart of the lens mounting process of the digital single-lens reflex camera in one Embodiment of this invention. It is a time chart of normal photography of a digital single-lens reflex camera in one 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 353 mirror charge cam 355 shutter charge cam 357 cam gear 361 shutter charge lever

Claims (20)

In cameras that allow live view with interchangeable lenses,
An image sensor;
A reflection mirror that moves to a reflection position that reflects the subject luminous flux and a retraction position that is retracted from the subject luminous flux;
A shutter disposed between the reflecting mirror and the image pickup device, capable of running a pair of shutter curtains by being charged, and being in a shutter curtain open state in a charged state;
Display means for displaying an image formed on the image sensor;
Lens detection means for detecting the mounting state of the interchangeable lens;
A cam member that performs charge driving of the shutter, and includes a first region that holds the shutter in a non-charged state and a closed state, and a second region that holds the shutter in an open state when the shutter is fully charged. Means,
Mirror cam means comprising a third region for positioning the reflecting mirror at the reflecting position and a fourth region for positioning the reflecting mirror at the retracted position;
In a state in which the image formed on the image sensor is displayed on the display means and live view is possible, the reflecting mirror is positioned at the retracted position by the fourth region of the mirror cam means, and is synchronized with this. The third region of the mirror cam means when the second region of the shutter cam means controls the shutter curtain to be in an open state by controlling the shutter curtain to the open state and detects that the interchangeable lens is detached. Control means for controlling the mirror to be positioned at the reflection position by the first region of the shutter cam means in synchronization with the reflection mirror;
Live viewable camera with. The shutter cam means further includes a fifth area for holding the shutter in a charged state, the mirror cam means further includes a sixth area positioned at the reflection position, and the control means includes the reflection mirror. In the normal mode in which the subject light beam reflected by the finder optical system is displayed by the finder optical system, the reflection mirror is positioned at the reflection position by the sixth area of the mirror cam means, and the fifth area of the shutter cam means is synchronized with this. 2. The live viewable camera according to claim 1, wherein the camera is controlled to hold the shutter in a closed state. The shutter cam means further includes a seventh area where the shutter is in a chargeable state so that the shutter can travel. The mirror cam means further includes an eighth area positioned at the retracted position. In the photographing mode for recording the image data acquired by the image sensor, the reflecting mirror is positioned at the retracted position by the eighth area of the mirror cam means, and synchronously with the seventh area of the shutter cam means. 2. The live viewable camera according to claim 1, wherein an exposure time is controlled by the shutter. The shutter cam means further includes a ninth area that keeps the uncharged state of the shutter continuously before the first area, and the mirror cam means further continues before the third area. The control means has a tenth area for driving the reflecting mirror from the retracted position to the reflecting position, and the control means retracts the reflecting mirror by the tenth area of the mirror cam means when the power is turned off. 2. The drive according to claim 1, wherein the shutter is driven to be located at the reflection position, and the shutter is controlled to maintain a shutter uncharged state by a ninth region of the shutter cam means. Live viewable camera. The shutter cam means further includes an eleventh area for continuously charging the shutter following the first area, and the mirror cam means further continues to the third area for the reflection mirror. The control means holds the reflection position of the reflection mirror by the twelfth area of the mirror cam means when the power is turned on, and the shutter is the first area of the shutter cam means. 2. The live viewable camera according to claim 1, wherein control is performed so that the shutter charging operation is performed according to 11 regions. The shutter cam means further has a thirteenth area for holding the shutter charge completion state before the second area, and the mirror cam means further places the reflection mirror before the fourth area. A fourteenth area driven from the reflection position to the retracted position, and the control means holds the shutter charge completion state by the thirteenth area of the shutter cam means when performing the live view; 2. The live view according to claim 1, wherein the reflection mirror is controlled so as to be positioned from the reflection position to the retracted position by a fourteenth region of the mirror cam means in synchronization therewith. camera. 7. The live viewable camera according to claim 6, wherein the fourteenth region of the mirror cam means is formed with a cam surface so that it can be driven in either the forward or reverse direction.   2. The live viewable camera according to claim 1, wherein the mirror cam means and the shutter cam means rotate together. 2. The live viewable camera according to claim 1, wherein the mirror cam means and the shutter cam means are constituted by an integral cam member.   2. The drive control unit according to claim 1, wherein, at the time of photographing, the movable reflection mirror is positioned at the reflection position, the shutter front curtain is once driven to a closed state, and then the opening operation is performed. Live viewable camera. A movable reflecting mirror movable to a reflection position on the photographing optical path of the photographing lens and a retreat position retracted from the photographing optical path;
An image sensor that is disposed on the photographing optical path of the photographing lens, receives a subject image formed by the photographing lens, and outputs a photoelectric conversion signal;
A normally open type shutter that is disposed between the imaging element and the movable reflecting mirror, and controls the exposure time of the subject image on the imaging element at the time of shooting;
A display device for live view display of the subject image based on the photoelectric conversion signal;
Lens detachment detecting means for detecting detachment of the interchangeable lens;
In performing the live view display, when the shutter is kept in the open state in the charge completion state, the movable reflecting mirror is driven to the reflection position, and the lens separation detecting means detects the separation of the interchangeable lens. Drive control means having a cam mechanism for driving the shutter to a closed state and driving the movable reflecting mirror to the reflecting position;
A camera capable of live view.   The cam mechanism of the drive control means has a mirror cam mechanism for driving the movable reflecting mirror, and a lens separation area and a live view area are formed on the cam surface of the mirror cam mechanism, and the lens The separation area is a cam surface for positioning the movable reflection mirror at the reflection position, and the live view area is a cam surface for positioning the movable reflection mirror at the retracted position. Item 12. The camera capable of live view according to Item 11.   13. The live view according to claim 12, wherein a lift surface for driving the movable reflecting mirror from the retracted position to the reflecting position is formed in front of the cam surface in the lens separation region of the mirror cam mechanism. Camera.   The cam mechanism of the drive control means has a shutter cam mechanism for driving the shutter, and a lens separation area and a live view area are formed on the cam surface of the shutter cam mechanism, and the lens separation area 12. The live viewable camera according to claim 11, wherein the shutter is held in an uncharged state, and the live view area holds the shutter in a charged state.   15. The live viewable camera according to claim 14, wherein a lift surface for charging the shutter is formed on a cam surface following a cam surface in a lens separation region of the shutter cam mechanism. In cameras that can be viewed live,
A movable reflecting mirror that is driven to a reflection position that enters the light flux from the photographing lens and reflects the light flux and a retreat position that retreats from the light flux passage area from the photographing lens;
A normally open type shutter disposed behind the movable reflecting mirror;
An image sensor that is disposed on a photographing optical path of the photographing lens, receives a subject image formed by the photographing lens, and outputs a photoelectric conversion signal;
A display device for live view display of the subject image based on the photoelectric conversion signal;
Lens detachment detecting means for detecting detachment of the interchangeable lens;
When the interchangeable lens of the camera is detached, the movable reflecting mirror is positioned at the reflecting position to keep the shutter closed, and when the live view is displayed, the movable reflecting mirror is positioned at the retracted position so that the shutter is fully charged. Control means;
A camera capable of live view.   The live view according to claim 16, wherein the control means drives the movable reflecting mirror from the retracted position to the reflecting position when the lens is detached, and charges the shutter when the lens is mounted. Possible camera. In the normal mode in which the object image is further observed with an optical finder, the control means positions the movable reflection mirror at the reflection position and holds the shutter in a charge completed state. Item 17. A live viewable camera according to Item 16. 19. The live viewable camera according to claim 18, wherein the control means is capable of reversibly switching between the normal mode and the live view display. In cameras that can be viewed live,
A movable reflecting mirror that is driven to a reflection position that enters the light flux from the photographing lens and reflects the light flux and a retreat position that retreats from the light flux passage area from the photographing lens;
A normally open type shutter disposed behind the movable reflecting mirror;
An image sensor that is disposed on a photographing optical path of the photographing lens, receives a subject image formed by the photographing lens, and outputs a photoelectric conversion signal;
A display device for live view display of the subject image based on the photoelectric conversion signal;
Control means for positioning the movable reflecting mirror at the reflection position and closing the shutter when the opening of the camera is in an open state;
A camera capable of live view.