JP2009020363A - Imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging device, which can quickly respond to an imaging element in switching between an exposing state and a non-exposing state in spite of a further simple structure, and be reduced in size. <P>SOLUTION: The single-lens reflex camera that is the imaging device comprises an imaging element 4; a finder optical system including a photographic lens 1 which generates a subject image by making a subject luminous flux incident on a light receiving surface 4a of the imaging element, a screen 5, a penta-prism 6 and an eye lens 7; an AF sensor part 13; a main rotary plate 2 having an opening part 2a for transmitting the subject luminous flux and a reflecting surface 2b for entering the subject luminous flux incident to the finder optical system; a sub-rotary plate 3 which can be set to a retreated position for transmitting the subject luminous flux and a position for reflecting the subject luminous flux to be incident on the AF sensor part; and a control part 11 controlling operations of the main rotary plate and the sub-rotary plate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a structure of an imaging apparatus that captures a subject image using an imaging element.

  Conventionally, as a configuration of a normal single-lens reflex camera that is an image pickup apparatus using an image pickup device, for example, as disclosed in Patent Document 1 or the like, as shown in a longitudinal sectional view (outline) of FIG. A photographic lens 101 detachable along the axis (O), a movable mirror 102 composed of a half mirror provided with a sub mirror 102a, a shutter 103, and an image sensor 104 are arranged, and further on the upper side of the optical axis. A screen 105, a pentaprism 106, and an eyepiece 107 are arranged, and an AF sensor unit 108 is arranged below the optical axis.

The movable mirror 102 is supported by a mirror shaft 102b extending left and right along a plane orthogonal to the optical axis and biased by a spring so as to be able to be opened and closed. Sometimes it is driven to rotate to an optical path entrance position (position in the imaging device non-exposure state) inclined in the imaging optical path, and is driven to rotate to a retracted position (position in the imaging device exposure state) retracted from the imaging optical path during exposure.
JP-A 61-46941

  However, in the conventional single-lens reflex camera, the rotational driving speed of the movable mirror 102 itself is limited, and the continuous shooting speed in high-speed continuous shooting is limited. In recent years, an image sensor capable of high-speed processing capable of continuous shooting at 10 frames / second or more has been developed, and it is considered difficult to cope with such an image sensor using the conventional movable mirror driving mechanism.

  In addition, the response operation when turning from the retracted position to the optical path entry position is delayed. Specifically, a bouncing occurs because the movable mirror stops suddenly, and it is difficult to quickly shift to the finder observation state or start the AF process.

  Further, since the movable mirror 102 needs to be pivoted as described above, the space occupied for the movable mirror 102 is large, which also hinders downsizing of the camera.

  The present invention has been made in order to solve the above-described problem. In an imaging apparatus using an imaging device, the imaging device has a simpler configuration, and a response for switching between an exposure state and an unexposed state of the imaging device. An object of the present invention is to provide an imaging device that is quick and can be made compact.

  An image pickup apparatus according to claim 1 of the present invention includes an image pickup element, a photographing optical system that causes a subject light beam to enter a light receiving surface of the image pickup element to generate a subject image, and a finder optical system that guides the subject light beam to a finder. Rotating about a detector that detects optical characteristics of the subject light beam and a first axis that intersects a plane that intersects the optical axis of the light beam, and can form an image on the light receiving surface along the rotation direction A first plate-like reflector having a first region for transmitting the subject light beam and a second region for reflecting and entering the subject light beam to the finder optical system, and imaging on the light receiving surface A second plate-like reflector that can alternatively set a first position for transmitting the subject luminous flux and a second position for reflecting the subject luminous flux to be incident on the detector; , And the second plate-like reflection And a control unit for controlling the operation.

  The imaging apparatus according to claim 2 of the present invention is the imaging apparatus according to claim 1, wherein the control unit is configured so that the first region and the first position are opposed to each other. Control is performed to synchronize the operation of the second plate-like reflector.

  The imaging device according to claim 3 of the present invention is the imaging device according to claim 1, wherein the control unit is configured to control the first and the first so that the first region and the second position face each other. Control is performed to synchronize the operation of the second plate-like reflector.

  The imaging device according to claim 4 of the present invention is the imaging device according to claim 1, wherein the first plate-like reflector is such that at least the second region is located on an optical axis of the light flux. Be controlled.

  The imaging device according to claim 5 of the present invention is the imaging device according to claim 1, wherein the second plate-like reflector is rotated to perform the first position and the second position. Move to.

  The imaging apparatus according to claim 6 of the present invention is the imaging apparatus according to claim 1, wherein the second plate-like reflector performs the swinging operation to move the first position and the second position. Move to position.

  The image pickup apparatus according to claim 7 of the present invention is the image pickup apparatus according to claim 1, wherein the second plate-like reflector performs the slide operation to move the first position and the second position. Move to.

  The image pickup apparatus according to claim 8 of the present invention is the image pickup apparatus according to claim 1, wherein when the release button is moved to the first trigger position, the control unit performs the first and second operations. The operation of the plate-like reflector is started.

  The image pickup apparatus according to claim 9 of the present invention is the image pickup apparatus according to claim 8, wherein the control unit causes the subject image for live view display to be captured from the image pickup element and the detection is performed at a predetermined timing. The first and second plate-like reflectors are operated in synchronization so that the subject luminous flux is incident on the device.

  According to a tenth aspect of the present invention, in the imaging device according to the eighth aspect, the control unit is configured to perform the first plate-like reflector at a rotation speed that is a constant multiple of a continuous shooting speed during a continuous shooting operation. And the operation of the second plate reflector is controlled in synchronization with the rotation of the first plate reflector.

  According to an eleventh aspect of the present invention, in the image pickup apparatus according to the eighth aspect, when the control unit causes the subject image for live view display to be captured from the image sensor, all the pixels of the image sensor. The number of pixels smaller than the number is taken in.

  According to a twelfth aspect of the present invention, an imaging device, an imaging optical system that generates a subject image by a subject light beam incident on a light receiving surface of the imaging device, and a detector that detects optical characteristics of the subject light beam, A first region that is plate-shaped, rotates about a first axis that intersects at substantially the center thereof, and transmits the subject luminous flux so as to be imageable on the light-receiving surface along the rotation direction; and A first plate-like reflector having a second region that blocks the subject light flux with respect to the light receiving surface; a first position that transmits the subject light flux so as to form an image on the light receiving surface; and The operation of the second plate-like reflector that can alternatively set the second position for reflecting the subject luminous flux and entering the detector, and the operations of the first and second plate-like reflectors. A control unit for controlling.

  According to the present invention, an image pickup apparatus using an image pickup device has a simpler configuration, has quick response to switching between an exposure state and a non-exposure state of the image pickup device, and can perform high-speed continuous shooting, for example. Thus, an imaging apparatus that can be made compact can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 3 are cross-sectional views along the optical axis showing the main configuration of a single-lens reflex camera that is an image pickup apparatus according to the first embodiment of the present invention. FIG. 1 shows an optical finder observation state. 2 shows an AF distance measurement (focus state detection for autofocus) state, and FIG. 3 shows an exposure state. 4 to 6 are front views of the main rotating plate and the sub rotating plate applied to the single-lens reflex camera in the above operating states.

  The single-lens reflex camera 10 of this embodiment includes a photographic lens 1 that can be attached to and detached from a camera body (not shown) as shown in FIGS. 1 to 3, and a subject behind the photographic lens 1 as a member built in the camera body. A main rotating plate 2 as a first plate-like reflector and a second plate-like reflection arranged along a lens optical axis (indicated by O in the figure) that is an optical axis of the photographing optical system in order from the side. A sub-rotation plate 3 as a body and an image sensor 4 are provided, and further disposed above the lens optical axis, a finder optical system to be described later, and an AF as a detector disposed below the lens optical axis. A release button that is one of the sensor unit 13, the drive motor 8 for driving the main rotating plate, the driving motor 9 for driving the sub-rotating plate, the control unit 11, and the camera operation switch, and instructing the start of photographing. Release switch 1 operated by It is provided with a door.

  The photographing lens 1 is a photographing optical system that takes in a subject light flux and forms an image of the subject on the light receiving surface 4 a of the image sensor 4.

  The finder optical system includes a screen 5 disposed above the lens optical axis, a pentaprism 6 disposed above the screen 5, and an eyepiece 7 disposed behind the pentaprism 6.

  The AF sensor unit 13 includes an optical unit and an AF distance sensor unit for detecting a focus state of a subject image that is an optical characteristic of the captured subject light beam.

  The main rotating plate 2 has a circular main plane that intersects with the lens optical axis direction, and a rotating shaft 8a that is a first axis that intersects the lens optical axis on the upper side (or lower side) of the lens optical axis. It is supported so as to be rotatable, and is driven to rotate by a drive motor 8 comprising a stepping motor via a rotation shaft 8a. A drive motor 8A shown in FIG. 1 is applied in place of the drive motor 8, and the main rotary plate 2 is rotationally driven by bringing the friction output shaft portion of the drive motor 8A into contact with the outer periphery of the main rotary plate 2. It is also possible to adopt.

  The main rotating plate 2 is provided with a fan-shaped opening 2a in the first region of the main surface of the rotating plate and a reflecting surface 2b for the optical finder on the front side of the second region (FIG. 4).

  The size of the opening 2a includes at least an imaging element light-receiving surface equivalent area Ar that is a light-receiving correspondence surface corresponding to the light-receiving surface 4a of the imaging element 4 at the position of the rotating plate on the optical path of the subject light beam (ie, imaging (It is larger than the element light receiving surface equivalent area Ar) (FIG. 6). The opening 2 a also functions as a shutter for the image sensor 4.

  The reflecting surface 2b is inclined with respect to the lens optical axis, and is located on the lens optical axis (FIGS. 1 and 4) on the screen 5 of the finder optical system in which the subject luminous flux is disposed above. Reflect toward you. The reflecting surface 2b is inclined to the upright side with respect to the lens optical axis at an angle of 45 °, and the occupied area in the lens optical axis direction of the main rotating plate 2 is further reduced. The screen surface of the screen 5 is also inclined with respect to the lens optical axis.

  The sub-rotation plate 3 has a semicircular reflecting surface 3a that intersects the lens optical axis direction, and is rotatably supported by a rotation shaft 9a that is a second axis that intersects the lens optical axis below the lens optical axis. It is rotated by a drive motor 9 comprising a stepping motor via a rotary shaft 9a. When the reflecting surface 3a of the sub-rotating plate 3 is in a position retracted from the lens optical axis that is the first position (FIGS. 3 and 6), the subject luminous flux reaches the light receiving surface 4a of the rear imaging device 4. When the sub-rotation plate 3 is rotated and the reflecting surface 3a is on the lens optical axis, which is the second position (FIGS. 2 and 5), the subject luminous flux is arranged downward by the reflecting surface 3a. Reflected toward the AF sensor unit 13.

  The control unit 11 takes in the first-stage and second-stage operation signals of the release switch 12 and controls the drive motors 8 and 9 based on the operation signals to rotate the main rotary plate 2 and the sub rotary plate 3. The imaging device 4 is exposed by controlling and transmitting the subject luminous flux through the optical finder observation state by the finder optical system, the distance measurement state by the AF sensor unit 13, and the opening 2a in a state synchronized with the rotation of the rotating plate. Switching control to the exposure state to be performed is performed. In the exposure state, an imaging signal of the subject image by the subject light flux is captured from the imaging device 4, and the live view display process and the imaging process are controlled.

  When the single-lens reflex camera 10 having the above-described configuration is used to perform single-shot shooting of a subject image, each operation is controlled under the control of the control unit 11. First, when the power is turned on, the main rotating plate 2 is rotated, and the reflecting surface 2b of the main rotating plate 2 is positioned on the lens optical axis as shown in FIGS. In this state, the subject luminous flux incident through the photographing lens 1 is reflected to the screen 5 side by the reflecting surface 2 b and can be observed by the optical viewfinder through the pentaprism 6 and the eyepiece lens 7. Further, when the live view mode is selected on the camera side, the main rotating plate 2 rotates at a predetermined rotation speed, and at the same time, the sub rotating plate 3 is rotated to retract the reflecting surface 3a from the lens optical axis. In this state, the subject light flux is intermittently incident on the light receiving surface of the image sensor 4 and a subject image is formed. The control unit 11 captures the imaging signal of the imaging device 4 with the number of pixels thinned out (live view mode), and displays a subject image based on the imaging signal on a monitor display unit (not shown) as a live view display image. At the same time, the subject image can be observed (slightly dark intermittent display) by the optical viewfinder.

  Based on the first stage operation signal of the release switch 12 when the release button is moved to the first trigger position, the main rotating plate 2 and the sub rotating plate 3 are synchronized, and the optimum speed for live view, for example, 30 rotations. It is driven at a speed of / sec and switched to the states of FIGS. The subject luminous flux is incident on the optical viewfinder side, the AF sensor unit 13 side, and the image sensor 4 side in a time-sharing state. Thereby, a slightly dark intermittent display finder observation by the optical finder, AF distance measurement, and live view display (when the live view mode is set) are performed. The photographing lens 1 is focused based on the distance measurement signal detected by the AF sensor unit 13. Further, the image sensor 4 is driven in the live view mode, and readout by pixel decimation readout and pixel addition is performed. Then, for example, it is read out at a speed of 30 frames / second and displayed in live view.

  Subsequently, based on the second-stage operation signal of the release switch 12 when the release button is moved to the second trigger position, the reflecting surface 3a of the sub rotary plate 3 is retracted from the lens optical axis. The opening 2a of the rotating plate 2 is positioned on the lens optical axis (FIG. 6), exposure of the image pickup device 4 is started, and after the exposure is finished, the main rotating plate 2 is rotated to move the opening 2a from the lens optical axis. Withdrawing, the reflecting surface 2b is positioned on the lens optical axis. The image pickup signal from the image pickup element 4 is read out from all pixels, and the image pickup signal is recorded on a medium or the like after image processing.

  Even when continuous shooting is performed with the single-lens reflex camera 10, each operation is controlled under the control of the control unit 11. First, when the first stage operation of the release switch 12 is performed, the main rotary plate 2 and the sub rotary plate 3 are rotated and driven at a speed corresponding to the continuous shooting speed in the same manner as in the single shooting described above. The subject luminous flux is incident on the optical viewfinder side, the AF sensor unit 13 side, and the image sensor 4 side in a time-sharing state. Observation by the optical finder, AF distance measurement operation, focusing operation of the taking lens 1, and live view display (when the live view mode is set) are performed. In the live view display, the image sensor 4 performs thinning-out readout of pixels in the live view mode. For example, in the case of a continuous shooting speed of 15 frames / second, the image pickup device 4 performs live at a speed increased by 30 frames / second by frame interpolation. A view is displayed. The rotation speed of the main rotating plate 2 and the sub rotating plate 3 is a constant multiple of the continuous shooting speed, and can be set to a rotation speed suitable for live view display in which display image flicker is suppressed.

  When the continuous shooting speed is R frames / second, the rotation speed of the main rotating plate 2 and the sub rotating plate 3 is R × N rotation / second in order to prevent flickering of the live view particularly when the continuous shooting speed is low. Is selected (N is 1, 2, 3...). For example, when the continuous shooting speed is 15 frames / second, the rotation speed is set to 15 rotations / second, 30 rotations / second, 60 rotations / second,. Also, when driving at a constant multiple of the continuous shooting speed, if there is a margin in the readout speed of the image sensor 4, the exposure during all pixel readout is driven in the finder mode of the live view display to smooth the live view display. It is also possible to make it.

  Subsequently, when the second-stage operation of the release switch 12 is performed, the main rotating plate 2 is driven to rotate in accordance with the continuous shooting speed (frame / second), and the image sensor 4 is driven in the all-pixel reading mode, so that continuous shooting is performed. The exposure control for the image processing is executed, and the image signal subjected to the image processing is sequentially recorded on a medium or the like. While the main rotating plate 2 is rotating, the optical viewfinder can be observed in a flickering state. In addition, live view display is possible when the live view mode is set. Further, by rotating the sub-rotation plate 3 in synchronization, the photographing lens 1 can be focused while following the moving subject during continuous shooting.

  When the release switch 12 is released, the photographing operation is stopped, the main rotating plate 2 is stopped in a state where the reflecting surface 2b is located on the lens optical axis, and the continuous photographing is finished.

  According to the single-lens reflex camera 10 of the present embodiment described above, the main rotating plate 2 having a reflecting surface and the sub-rotation instead of the oscillating movable mirror 102 applied in the conventional single-lens reflex camera 100 shown in FIG. Since the plate 3 is employed, the rotating plates can be accommodated in a narrow space in the optical path of the subject light flux. In addition, since each of the rotating plates is driven to rotate and the inclination angle thereof does not change, there is no influence of the bounce of the reflecting surface when stopped, and optical finder observation and distance measurement can be started quickly. The responsiveness of switching the element 24 to the exposure state can also be accelerated.

  Further, during continuous shooting, there is no need to drive the movable mirrors as in the conventional single-lens reflex camera 100 described above, and the bounce phenomenon due to the swinging of the movable mirrors because the rotary plates are driven to rotate. In this way, continuous shooting at a high speed, for example, 10 frames / second or more is possible.

Next, the single-lens reflex camera which is an imaging device of 2nd embodiment of this invention is demonstrated using FIGS.
7 to 9 are cross-sectional views along the optical axis showing the main configuration of the single-lens reflex camera of the present embodiment. FIG. 7 shows an optical viewfinder observation state, and FIG. 8 shows an AF distance measurement state. FIG. 9 shows an exposure state. 10 to 12 are front views of the main rotating plate and the sub swinging plate applied to the single-lens reflex camera in the respective operating states.

  The single-lens reflex camera 20 of this embodiment includes a photographic lens 21 that can be attached to and detached from a camera body (not shown) as shown in FIGS. A main rotating plate 22 as a first plate-like reflector and a second plate-like reflector arranged along a lens optical axis (indicated by O in the figure) which is an optical axis of the photographing optical system in order from A sub-oscillation plate 23 and an image sensor 24, and further disposed above the lens optical axis, a finder optical system to be described later, and AF as a detector disposed below the lens optical axis. A sensor unit 33, a drive motor 28 for driving the main rotating plate, a drive motor 29 for driving the sub-oscillating plate, a control unit 31, and a camera operation switch, and a release for instructing the start of shooting. And a switch 32.

  The photographing lens 21 is a photographing optical system that takes in a subject light flux and forms an image of the subject on the light receiving surface 24 a of the image sensor 24.

  The finder optical system includes a screen 25 disposed above the lens optical axis, a pentaprism 26 disposed above the screen 25, and an eyepiece lens 27 disposed behind the pentaprism 26.

  The AF sensor unit 33 includes an optical unit and an AF distance sensor unit for detecting a focus state of a subject image that is an optical characteristic of the captured subject light beam.

  The main rotating plate 22 has a circular main plane that intersects with the lens optical axis direction, and a rotating shaft 28a that is a first axis that intersects the lens optical axis on the upper side (or lower side) of the lens optical axis. It is supported so as to be rotatable, and is rotationally driven via a rotating shaft 28a by a drive motor 28 comprising a stepping motor.

  A fan-shaped opening 22a is arranged in the first region of the main plane of the main rotating plate 22, and a reflection surface 22b for the optical finder is arranged on the front side of the second region (FIG. 10).

  The size of the opening 22a includes at least an image sensor light receiving surface equivalent area Ar that is a light receiving corresponding surface corresponding to the light receiving surface 24a of the image sensor 24 at the rotating plate position on the optical path of the subject light beam (that is, imaging). (It is larger than the element light receiving surface equivalent area Ar) (FIG. 12). The opening 22 a also functions as a shutter for the image sensor 24.

  The reflecting surface 22b is inclined with respect to the lens optical axis, and is positioned on the lens optical axis (see FIGS. 7 and 10). Reflect toward you. The reflecting surface 22b is inclined to the upright side with respect to the lens optical axis at an angle of 45 °, and the area occupied by the main rotating plate 22 in the lens optical axis direction is further reduced. The screen surface of the screen 25 is also inclined with respect to the lens optical axis.

  The sub oscillating plate 23 has a reflecting surface 23a, and is slidably supported by an oscillating shaft 29a that is a second axis along a surface intersecting the lens optical axis below the lens optical axis. . Then, the drive motor 29 formed of a stepping motor is driven to swing (rotate) between the first and second positions via the swing shaft 29a. When the reflecting surface 23a of the sub oscillating plate 23 is at a position retracted from the lens optical axis which is the first position (FIGS. 9 and 12), the subject light beam reaches the light receiving surface 24a of the rear image sensor 24. Further, when the sub-oscillation plate 23 is driven to rotate and the reflecting surface 23a is at the second position on the lens optical axis (FIGS. 8 and 11), the subject luminous flux is arranged downward by the reflecting surface 23a. It is reflected toward the AF sensor unit 33 that is being operated.

  The control unit 31 takes in the first-stage and second-stage operation signals of the release switch 32 and drives and controls the drive motors 28 and 29 based on the operation signals to rotate the main rotary plate 22 and the sub swing plate 23. The rotation is controlled and the subject is obtained through the optical finder observation state by the finder optical system, the distance measurement state by the AF sensor unit 33, and the opening 22a in a state synchronized with the rotation and the rotation and rotation of the swinging plate. Control of switching between the exposure state in which the light beam is transmitted and the image sensor 24 is exposed is performed. Then, the imaging element 24 captures the imaging signal of the subject image by the subject luminous flux, and controls live view display processing and imaging processing.

  The single-shot and continuous shooting operations of the subject image by the single-lens reflex camera 20 of the present embodiment having the above-described configuration are performed from the position on the lens optical axis of the sub-rotation plate 3 to the retracted position in the first embodiment. In this embodiment, the rotation operation is simply changed from the position on the lens optical axis of the sub-oscillation plate 23 to the rotation operation between the retracted positions, and the rotation control of the other main rotation plate 22 and the synchronization with the sub-oscillation plate 23 are performed. The drive control and the read control operation of the image sensor 24 are also controlled in the same manner as in the first embodiment.

  According to the single-lens reflex camera 20 of the present embodiment described above, the main rotating plate 22 and the sub-oscillation plate having a reflecting surface instead of the oscillating movable mirror 102 applied in the conventional single-lens reflex camera 100 shown in FIG. Since the moving plate 23 is employed, the rotating plate 22 can be accommodated in a narrow space in the optical path of the subject light flux. Further, since the main rotating plate 22 is driven to rotate, there is no bounce phenomenon when stopped, and optical finder observation can be started quickly, and the switching response to the exposure state of the image sensor 24 is quick. can do.

  Further, at the time of continuous shooting, it is not necessary to swing the movable mirror like the conventional single-lens reflex camera 100 described above, it is only necessary to rotationally drive the main rotating plate 22, no bounce phenomenon occurs, and high speed. For example, continuous shooting at 10 frames / second or more becomes possible.

Next, as a modified example of the sub swing plate applied to the single-lens reflex camera of the second embodiment described above, a sub slide plate applied will be described with reference to FIGS.
13 to 15 are front views of an optical viewfinder observation state, an AF distance measurement state, and an exposure state of a main rotary plate and a sub slide plate of a single-lens reflex camera to which the sub slide plate of the above modification is applied. In addition, the same code | symbol is attached | subjected and demonstrated to the component similar to the single-lens reflex camera of 2nd embodiment.

  The sub-slide plate 41 of the present modification has a structure that is slid and driven while the sub-oscillation plate 23 in the second embodiment is driven to oscillate. Specifically, the sub-slide plate 41 has a reflection surface 41a that intersects the lens optical axis direction at a predetermined inclination angle. And it is slidably supported by a slide shaft 42 which is a second axis along a surface intersecting with the lens optical axis on the lower side of the lens optical axis, and is slidably supported by the drive motor 43 along the slide shaft 42. The slide drive is performed while maintaining the predetermined inclination angle between the first position and the second position. When the reflecting surface 41a of the sub-slide plate 41 is at a position retracted from the lens optical axis that is the first position (FIG. 15), the subject luminous flux reaches the light receiving surface 24a of the rear image sensor 24. When the sub-slide plate 41 slides and the reflecting surface 41a is on the lens optical axis, which is the second position (FIG. 14), the subject luminous flux is disposed below the reflecting surface 41a. Reflected toward the sensor unit 33.

  The operations of single-shot shooting and continuous shooting of a subject image by a single-lens reflex camera to which the sub-slide plate 41 of the present modification having the above-described configuration is applied are also on the lens optical axis of the sub-rotation plate 3 in the first embodiment. The rotation operation from the position to the retracted position is merely changed from the position on the lens optical axis of the sub slide plate 41 of the present modification to the slide operation between the retracted positions, and the rotation control of the other main rotating plate 22 and the sub slide plate 41 are performed. And the reading control operation of the image sensor 24 are controlled in the same manner as in the first and second embodiments.

  The single-lens reflex camera to which the above-described sub-slide plate 41 of this modification is applied also has the same effect as the single-lens reflex camera 20 of the second embodiment. In particular, in the case of the present single-lens reflex camera, the sub-slide plate 41 slides between the first position and the second position while maintaining the predetermined inclination angle, and the inclination angle does not change. Even immediately after moving to the position, there is no influence by the bounce, and the distance measuring operation can be started promptly.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention at the stage of implementation. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements.

  According to the image pickup apparatus of the present invention, an image pickup apparatus using an image pickup element has a simpler configuration and has a quick response to switching between an exposure state and a non-exposure state of the image pickup element, for example, high-speed continuous shooting. It can be used as an imaging device that can be made compact.

It is sectional drawing along the optical axis which shows the main structures of the single-lens reflex camera which is an imaging device of 1st embodiment of this invention, Comprising: An optical finder observation state is shown. It is sectional drawing along the optical axis which shows the main structures of the single-lens reflex camera of FIG. 1, Comprising: AF focusing state is shown. It is sectional drawing along the optical axis which shows the main structures of the single-lens reflex camera of FIG. 1, Comprising: An exposure state is shown. It is a front view which shows the optical finder observation state of the main rotating plate and subrotating plate in the single-lens reflex camera of FIG. It is a front view which shows the AF ranging state of the main rotary plate and sub rotary plate in the single-lens reflex camera of FIG. It is a front view which shows the exposure state of the main rotary plate and sub rotary plate in the single-lens reflex camera of FIG. It is sectional drawing along the optical axis which shows the main structures of the single-lens reflex camera which is an imaging device of 2nd embodiment of this invention, Comprising: An optical finder observation state is shown. FIG. 8 is a cross-sectional view along the optical axis showing the main configuration of the single-lens reflex camera in FIG. 7, showing an AF distance measurement state. FIG. 8 is a cross-sectional view along the optical axis showing the main configuration of the single-lens reflex camera in FIG. 7, showing an exposure state. It is a front view which shows the optical finder observation state of the main rotating plate and sub-oscillation plate in the single-lens reflex camera of FIG. FIG. 8 is a front view showing an AF distance measurement state of a main rotary plate and a sub swing plate in the single-lens reflex camera of FIG. 7. FIG. 8 is a front view showing an exposure state of a main rotating plate and a sub swing plate in the single-lens reflex camera of FIG. 7. FIG. 8 is a front view showing an optical viewfinder observation state of the main rotating plate and the sub slide plate when a sub slide plate which is a modification of the sub swing plate of the single-lens reflex camera of FIG. 7 is applied. FIG. 8 is a front view showing an AF distance measurement state of the main rotating plate and the sub-slide plate when a sub-slide plate which is a modification of the sub-swing plate of the single-lens reflex camera of FIG. 7 is applied. FIG. 8 is a front view showing an exposure state of the main rotating plate and the sub slide plate when a sub slide plate which is a modification example of the sub swing plate of the single-lens reflex camera of FIG. 7 is applied. It is sectional drawing along the optical axis which shows the main structures of the single-lens reflex camera which is a conventional imaging device.

Explanation of symbols

1, 21 ... Shooting lens (shooting optical system)
2,22 ... Main rotating plate (first plate-like reflector)
2a, 22a
... Opening (first area)
2b, 22b
... reflecting surface (second area)
3 Sub-rotating plate (second plate-like reflector)
4, 24 ... Image sensor 4a, 24a ... Light receiving surface 5, 25
... Screen (finder optics)
6, 26
... Pental prism (finder optical system)
7, 27
... Eyepiece lenses (finder optics)
8, 8A, 28 ... drive motor 8a, 28a
... Rotation axis (axis)
11, 31, 43 ... control unit 12, 32 ... release switch (switch operated by release button)
13, 33 ... AF sensor part (detector)
23 ... Sub-oscillating plate (second plate-like reflector)
23a ... Reflecting surface 29a ... Oscillating shaft 41 ... Sub-sliding plate (second plate-like reflecting plate)
41a ... reflective surface 42 ... slide axis

Claims (12)

An image sensor;
A photographic optical system that causes a subject luminous flux to enter the light receiving surface of the image sensor and generate a subject image;
A viewfinder optical system that guides the subject luminous flux to the viewfinder;
A detector for detecting optical characteristics of the subject luminous flux;
A first region that rotates about an axis that intersects a plane that intersects the optical axis of the light beam, and that transmits the subject light beam so as to form an image on the light receiving surface along the rotation direction; and A first plate-like reflector having a second region to be reflected and incident on the finder optical system;
A second plate that can alternatively set a first position at which the subject luminous flux is transmitted so as to form an image on the light receiving surface and a second position at which the subject luminous flux is reflected and incident on the detector. A reflector,
A control unit for controlling the operation of the first and second plate-like reflectors;
An imaging device comprising:   The said control part performs control which synchronizes operation | movement of said 1st and said 2nd plate-shaped reflector so that said 1st area | region and said 1st position may oppose. Item 2. The imaging device according to Item 1.   The said control part performs control which synchronizes operation | movement of said 1st and said 2nd plate-shaped reflector so that said 1st area | region and said 2nd position may oppose. Item 2. The imaging device according to Item 1.   The imaging apparatus according to claim 1, wherein the first plate-like reflector is controlled so that at least the second region is positioned on an optical axis of the light beam.   The imaging apparatus according to claim 1, wherein the second plate-like reflector moves to the first position and the second position by performing a rotation operation.   The imaging apparatus according to claim 1, wherein the second plate-like reflector moves to the first position and the second position by performing a swinging operation.   The imaging apparatus according to claim 1, wherein the second plate-like reflector moves to the first position and the second position by performing a sliding operation.   2. The imaging apparatus according to claim 1, wherein when the release button is moved to a first trigger position, the control unit starts the operation of the first and second plate-like reflectors. .   The control unit causes the subject image for live view display to be captured from the imaging device, and the first and second plate-like shapes so that the subject luminous flux enters the detector at a predetermined timing. The imaging apparatus according to claim 8, wherein the reflector is operated in synchronization.   The control unit rotates the first plate-like reflector at a rotation speed that is a constant multiple of the continuous shooting speed during the continuous shooting operation, and synchronizes with the rotation of the first plate-like reflector. The imaging apparatus according to claim 8, wherein the operation of the plate-like reflector is controlled.   9. The imaging apparatus according to claim 8, wherein when the subject image for live view display is captured from the imaging device, the control unit causes the number of pixels smaller than the total number of pixels of the imaging device to be captured. An image sensor;
An imaging optical system for generating a subject image by a subject luminous flux incident on the light receiving surface of the imaging element;
A detector for detecting optical characteristics of the subject luminous flux;
A first region that is plate-shaped, rotates about a first axis that intersects at substantially the center thereof, and transmits the subject luminous flux so as to form an image on the light-receiving surface along the rotation direction; and A first plate-like reflector having a second region for shielding the subject luminous flux with respect to the light receiving surface;
A second plate that can alternatively set a first position at which the subject luminous flux is transmitted so as to form an image on the light receiving surface and a second position at which the subject luminous flux is reflected and incident on the detector. A reflector,
A control unit for controlling the operation of the first and second plate-like reflectors;
An imaging device comprising:

Images