JP2017146319A - Imaging device having mirror drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device in which a focus detection unit 300 can be downsized without reducing a distance measurable range by rotationally moving a sub-mirror 503 and measuring the distance.SOLUTION: Provided is an imaging device including a main mirror holder 502 equipped with a main mirror 501, and a sub-mirror holder 504 equipped with a sub-mirror 503 engaged with the main mirror holder 502 and controllable among a first mirror unit position for guiding a subject beam to a focus detection sensor unit 300, a second mirror unit position where it rotationally moves to the observation position of the main mirror holder 502, and a third mirror unit position rotationally moving to the photographing position of the main mirror holder 502. The device is characterized in that when distance measurement begins, the sub-mirror holder 504 rotationally moves between the first mirror unit position and the second mirror unit position, thereby measuring the distance.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an imaging apparatus, and more particularly to control of distance measuring means when a quick return mirror is driven.

  Conventionally, a single-lens reflex camera has a quick return mirror mechanism that can rotate between an observation position for guiding a light beam from a photographing lens to an observation optical path and an imaging position for guiding the optical path (imaging optical path) of an imaging optical system. Yes.

  The quick return mirror mechanism includes a main mirror holder having a main mirror composed of a half mirror and a sub mirror holder having a sub mirror attached to the main mirror holder and for guiding a subject light beam to a focus detection device.

  At the time of focus detection and viewfinder observation, the main mirror and the sub mirror are stopped at fixed positions in the photographing optical path, and at the time of photographing, the main mirror and the sub mirror are retracted out of the photographing optical path.

  In the conventional quick return mirror mechanism, the sub mirror holder is engaged and supported by the main mirror holder, and as a mirror up operation, the main mirror holder pulls up the sub mirror (see Patent Document 1).

JP 2011-27966 A

  However, as disclosed in Patent Document 1 described above, in the conventional quick return mirror mechanism, the sub mirror holder is engaged and supported by the main mirror holder, and the main mirror holder pulls up the sub mirror as an operation of raising the mirror. It is a mechanism. Therefore, the sub mirror holder at the time of focus detection is supported at a predetermined position, and the size depends on the range of the distance measurement range.

  Accordingly, an object of the present invention is to prepare a driving means with a single sub-mirror holder, and to measure the distance by driving the sub-mirror holder by scanning within a predetermined range during distance measurement, so that the subject luminous flux entering the focus detection device is in the distance measurement range. It is to enable distance measurement even when it is outside. That is, an object of the present invention is to provide an imaging device having a mirror driving device that can reduce the size of the focus detection device without reducing the distance measurement range.

In order to achieve the above object, an imaging apparatus having a mirror driving device according to the present invention includes:
Image sensor 33, focus detection means 300, photometry means 23, finder optical system 4 provided with the photometry means 23, SW 17a for starting distance measurement by the focus detection means 300, and recording to the image sensor An operation member 7 having a switch SW2 7b for starting the operation, and a main mirror that can be rotated between an observation position that guides the subject light flux to the finder optical system 4 and a photographing position that does not block the subject light flux to the image sensor 33. A main mirror holder 502 provided with 501, a first mirror unit position that engages with the main mirror holder 502 and guides the subject light flux to the focus detection sensor unit 300, and rotates to an observation position of the main mirror holder 502 The second mirror unit position to be rotated and the third mirror unit position to be rotated to the photographing position of the main mirror holder 502 In the imaging apparatus having the sub-mirror holder 504 with a controllable submirror 503,
By starting the distance measurement, the sub mirror holder 504 rotates between the first mirror unit position and the second mirror unit position to perform distance measurement.

  According to the imaging apparatus having the mirror driving device according to the present invention, a driving unit with a single sub-mirror holder is prepared, and the distance is measured by scanning the sub-mirror holder by a predetermined range at the time of distance measurement. This is to enable distance measurement even when the subject light flux entering is outside the distance measurement range. Accordingly, it is possible to provide an imaging device having a mirror driving device that can reduce the size of the focus detection device.

1 is a block diagram showing a main electrical configuration of a digital single-lens reflex camera according to an embodiment of the present invention. The figure explaining the composition of a digital single-lens reflex camera The figure explaining the composition of a digital single-lens reflex camera The figure explaining the composition of a digital single-lens reflex camera Exploded perspective view illustrating the configuration of the mirror drive unit 1000 Schematic showing a path through which a conventional light beam 310 enters the focus detection unit 300 Schematic showing a path through which a light beam 310 is incident on the focus detection unit 300 in an embodiment of the present invention Flowchart showing the operation of the submirror 503 according to the first embodiment. The flowchart which shows operation | movement of the submirror 503 by 2nd Example. Flowchart showing the operation of the submirror 503 according to the third embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  Hereinafter, an image pickup apparatus having a mirror driving device according to a first embodiment of the present invention will be described with reference to FIGS.

  In FIG. 1, a central processing unit 100 (hereinafter referred to as MPU 100) of a microcomputer built in the camera body controls the operation of the camera, and executes various processes and instructions for each element.

  The EEPROM 100a built in the MPU 100 can store time information of the time measuring circuit 109 and other information. Connected to the MPU 100 are a mirror drive circuit 101, a focus detection circuit 102, a shutter drive circuit 103, a video signal processing circuit 104, a switch sense circuit 105, and a photometry circuit 24. A liquid crystal display drive circuit 107, a battery check circuit 108, a time measurement circuit 109, a power supply circuit 110, and a piezoelectric element drive circuit 111 are also connected. These circuits operate under the control of the MPU 100.

  Further, the MPU 100 communicates with the lens control circuit 201 disposed in the photographing lens unit via the mount contact 21. The mount contact 21 also has a function of transmitting a signal to the MPU 100 when the photographing lens unit is connected. Thereby, the lens control circuit 201 can communicate with the MPU 100 and drive the photographing lens 200 and the diaphragm 204 in the photographing lens unit via the AF driving circuit 202 and the diaphragm driving circuit 203. Become. In the present embodiment, a single photographing lens is shown for the sake of convenience, but in actuality, it is composed of a large number of lens groups.

  The AF drive circuit 202 is configured by, for example, a stepping motor, and adjusts the imaging light flux to be focused on the image sensor 33 by changing the focus lens position in the imaging lens 200 under the control of the lens control circuit 201.

  Reference numeral 203 denotes an aperture drive circuit, which is configured by, for example, an auto iris or the like, and is configured to change the aperture 204 by the lens control circuit 201 to obtain an optical aperture value.

  The mirror unit 500 includes a main mirror 501 and a sub mirror 503. Furthermore, the mirror unit 500 is movable from the first position (FIG. 2a) to the third position (FIG. 2c) via the second position (FIG. 2b).

  The main mirror 501 guides the imaging light flux that passes through the imaging lens 200 to the finder optical system 4 at the first position of the mirror unit 500, and transmits a part thereof to the sub mirror 503.

The sub mirror 503 guides the transmitted photographic light flux to the focus detection sensor unit 300.
The mirror unit 500 retracts to the third position so as not to block the light flux from the imaging lens 200 toward the imaging element 33 during imaging.

  The mirror drive circuit 101 is for driving the mirror unit 500 from the first position to the third position or from the third position to the first position as shown in FIG. 2a or 2c. It drives and controls a motor (not shown) and detects the position of the mirror.

  The signal output from the focus detection sensor unit 300 is supplied to the focus detection circuit 102, converted into a subject image signal, and then transmitted to the MPU 100. The MPU 100 performs focus detection calculation by the phase difference detection method based on the subject image signal. Then, the defocus amount and the defocus direction are obtained, and based on this, the focus lens in the photographing lens 200 is driven to the in-focus position via the lens control circuit 201 and the AF drive circuit 202.

  The pentaprism 22 is an optical member that converts and reflects the photographing light beam reflected by the main mirror 501 into an erect image. The user can observe the subject image from the viewfinder eyepiece window 18 through the viewfinder optical system. The pentaprism 22 guides part of the photographing light flux to the photometric sensor 23. The photometric circuit 24 obtains the output of the photometric sensor 23, converts it into a luminance signal for each area on the observation surface, and outputs it to the MPU 100. The MPU 100 calculates an exposure value from the obtained luminance signal.

  The mechanical focal plane shutter 106 blocks the photographing light beam when the user observes the subject image with the viewfinder. Further, at the time of imaging, a desired exposure time is obtained according to the time difference between travel of a front blade group and a rear blade group (not shown) according to a release signal. The focal plane shutter 106 is controlled by a shutter drive circuit 103 that has received a command from the MPU 100.

  The imaging element 33 is a CMOS that is an imaging device. There are various types of imaging devices such as a CCD type, a CMOS type, and a CID type, and any type of imaging device may be adopted.

  A clamp / CDS (correlated double sampling) circuit 34 performs basic analog processing before A / D conversion and can also change the clamp level.

  The AGC (automatic gain adjustment device) 35 performs basic analog processing before A / D conversion and can change the AGC basic level.

  The A / D converter 36 converts the analog output signal of the image sensor 33 into a digital signal.

  The infrared cut filter 32 having a substantially rectangular shape cuts unnecessary infrared light of the light beam incident on the image sensor 7. In addition, the surface is covered with a conductive material in order to prevent foreign matter from adhering.

  The optical low-pass filter 113 is configured by laminating and laminating a plurality of birefringent plates and phase plates made of quartz, and further laminating an infrared cut filter.

  The laminated piezoelectric element 112 is configured to be excited by a piezoelectric element drive circuit 111 that has received a command from the MPU 100 and transmit the vibration to the optical low-pass filter 113.

  The video signal processing circuit 104 performs overall image processing by hardware such as gamma / knee processing, filter processing, and information synthesis processing for monitor display on the digitized image data. The image data for monitor display from the video signal processing circuit 104 is displayed on the color liquid crystal monitor 19 via the color liquid crystal drive circuit 115. Further, the video signal processing circuit 104 can also store image data in the buffer memory 37 through the memory controller 38 in accordance with an instruction from the MPU 100.

  Further, the video signal processing circuit 104 has a function of performing image data compression processing such as JPEG. When continuous shooting is performed, such as continuous shooting, image data can be temporarily stored in the buffer memory 37 and unprocessed image data can be sequentially read out through the memory controller 38. Thus, the video signal processing circuit 104 can sequentially perform image processing and compression processing regardless of the speed of the image data input from the A / D converter 36.

  The memory controller 38 stores image data input from the external interface 40 (corresponding to a video signal output jack and a USB output connector) in the memory 39, and stores image data stored in the memory 39 in the external interface. It also has a function of outputting from 40. The memory 39 is a flash memory that can be attached to and detached from the camera body.

  The switch sense circuit 105 transmits an input signal to the MPU 100 according to the operation state of each switch.

  7a is a switch SW1 that is turned on by the first stroke of the shutter button 7.

  Reference numeral 7b denotes a switch SW2 that is turned on by the second stroke of the shutter button 7. When the switch SW2 is turned on, an instruction to start photographing is transmitted to the MPU 100. Further, the main operation dial 8, the sub operation dial 20, the shooting mode setting dial 14, the main SW 43, the AF mode switching SW 44, and the focus mode switching SW 45 are connected.

  A focus mode switching SW 45 is a switch for selecting a focus mode, and can select either auto focus (hereinafter referred to as AF) or manual focus (hereinafter referred to as MF).

  The AF mode switching SW 44 is a switch for selecting an AF mode, and one of one-shot AF / AI servo AF / AI focus AF can be selected.

  The liquid crystal display drive circuit 107 drives the LCD display panel 9 and the in-finder liquid crystal display device 41 in accordance with instructions from the MPU 100.

  The battery check circuit 108 performs a battery check for a predetermined time according to a signal from the MPU 100 and sends the detection output to the MPU 100.

  The power supply unit 42 supplies necessary power to each element of the camera.

  The time measuring circuit 109 can measure the time and date from when the main switch 43 is turned off to when it is turned on, and can transmit the measurement result to the MPU 100 according to a command from the MPU 100.

  FIG. 2 is a diagram illustrating the configuration of a digital single-lens reflex camera.

  In FIG. 2, a photographic lens 200 is attached to the camera body 1.

  The camera body 1 includes a focus detection sensor unit 300, an optical viewfinder unit 4, a mirror drive unit (not shown), and an image sensor 33.

  The mirror drive unit is shown in FIG. 2C in which the mirror unit 500 is shown in the mirror down position (first position) shown in FIG. 2A, the sub-mirror closed position (second position) shown in FIG. Drive between the mirror up position (third position).

  The mirror unit 500 includes a main mirror holder 502 that holds a main mirror 501 and a sub mirror holder 504 that holds a sub mirror 503.

  The main mirror holder 502 is attached to the mirror box 400 so as to be rotatable about a rotation shaft 502a (see FIG. 3).

  The sub mirror holder 504 is attached to the main mirror holder 502 so as to be rotatable about a rotation center hole 502a (see FIG. 3).

In the state of FIG. 2A, the mirror unit 500 is located in the optical path, and the light beam that has passed through the photographing lens 200 is separated by the main mirror 501. The light beam reflected by the main mirror is guided to the pentaprism 22 of the optical finder unit 4. On the other hand, the light beam transmitted through the main mirror 501 is reflected by the sub mirror 504 and guided to the focus detection sensor unit 300.
Therefore, in the situation of FIG. 2A, the light beam transmitted through the photographing lens 200 is not guided to the image sensor 33. In the situation shown in FIG. 2A, the main mirror holder 502 and the sub mirror holder 504 are located at the mirror down position.

  FIG. 2B shows a state in which the main mirror holder 502 is located at the mirror down position and the sub mirror holder 504 is mirrored up to a position where it overlaps the main mirror 501. The light beam that has passed through the photographing lens 200 reflected by the main mirror 501 is guided to the pentaprism 22 of the finder optical system 4 without being guided to the focus detection sensor unit 31, and can be confirmed by the photographer via the finder eyepiece 18. .

  In the state of FIG. 2C, the mirror unit 500 is retracted from the optical path. More specifically, the main mirror holder 502 and the sub mirror holder 504 are retracted above the mirror box 400 from the state of FIG.

  In the state of FIG. 2C, the light beam that has passed through the photographing lens 200 is guided to the imaging sensor 33 without being guided to the optical finder unit 4 and the focus detection sensor unit 300. In the state shown in FIG. 2C, the main mirror holder 502 and the sub mirror holder 504 are located at the mirror up position.

  As described above, the mirror driving unit drives the mirror unit 500 between the mirror-down position shown in FIG. 2A and the mirror-up position shown in FIG.

  FIG. 3 is an exploded perspective view illustrating the configuration of the mirror unit 500, and the relationship between the main mirror holder 502 and the sub mirror holder 504 in FIG. 2 will be described here.

  The mirror unit 500 includes a main mirror holder 502 that holds a main mirror 501 and a sub mirror holder 504 that holds a sub mirror 503.

  The main mirror holder 502 is formed with rotation shafts 502a and 502b, and is attached to the mirror box 400 so as to rotate about the rotation shaft 502a.

  A hole 504a is formed in the sub mirror holder 504. The hole 504a is supported by a shaft 502b formed in the main mirror holder 502, and rotates about the shaft 502b. Further, a sub mirror holder drive shaft 504c is formed, and the sub mirror holder 504 is driven when power is transmitted to the drive shaft by a mirror drive unit (not shown).

  When the sub mirror holder 504 is driven, the main mirror holder 502 is pushed up to perform the mirror up operation. The mirror-down operation is a mechanism for performing the mirror-down operation by pulling the main mirror holder 502 down to the sub-mirror holder 504, and enables the operation shown in FIG.

  Hereinafter, further details will be described with reference to FIG. FIG. 4 is a schematic diagram illustrating a path through which the light flux 310 incident on the distance measurement position enters the focus detection unit 300.

  The focus detection unit 300 includes a field lens 301, a reflecting mirror 302, a diaphragm 303 having a pair of openings, a pair of secondary imaging lenses 304, and an image sensor 305 including a pair of photoelectric conversion element arrays. Configured.

  The light beam 310 that has passed through the photographing lens 200 passes through the main mirror 501, is reflected by the sub mirror 503, passes through the field lens 301, and enters the reflecting mirror 302. After that, the light is reflected and imaged on the image sensor 305 through the diaphragm 303 and the secondary imaging lens 304 at a predetermined interval. The main mirror holder 502 and the sub mirror holder 504 are omitted.

  FIG. 4 shows a conventional first mirror unit position, and the sub-mirror 503 is stationary during distance measurement.

  310a indicates the uppermost end of the light beam, 310c indicates the lowermost end, and 310b indicates a certain position therebetween. In this state, the reflecting mirror 302 needs to be incident on all of the light beams 310a to 310c, so that the reflecting mirror 302 increases in size. This makes it difficult to reduce the size of the focus detection unit 300.

  FIGS. 5A and 5B show the structure in this embodiment, and a schematic view until the light beam 310 is guided to the reflecting mirror 302 is shown.

  The sub mirror 503 is held by a mirror drive unit (not shown) and rotates during distance measurement.

  FIG. 5A shows the state of the first mirror unit position. The reflecting mirror 302 of this embodiment is smaller than the light beam 310, and can enter only the region of the light beam 310a to the light beam 310b.

  FIG. 5B shows a state in which the sub mirror 503 is rotated by a mirror driving unit (not shown). In this state, it is possible to enter the region of the light beam 310b to the light beam 310c, which was not incident on the reflecting mirror 302 in FIG. 5A.

  By scanning from FIG. 5A to FIG. 5B during distance measurement, focus detection is possible even when the reflecting mirror 302 is smaller than the region of the light beam 310, and thus the focus detection unit 300 can be downsized. Become.

  The mechanism of the mirror drive unit is not limited as long as it can achieve the distance measurement operation of the sub mirror 503 shown in FIG.

  FIG. 6 is a flowchart showing the operation of the sub-mirror 503 in the first embodiment of the present invention.

  First, in step 101, it is determined whether the focus mode is AF or MF.

  In the case of AF, the process proceeds to Step 102, and in the case of MF, the process proceeds to Step 108 while the sub mirror 503 is fixed.

  When SW1 7a is turned on in step 102, the process proceeds to step 103, the photometry circuit 24 is activated, and photometry is started by the photometry sensor 23. If SW1 7a is not turned on in step 102, the standby state is entered.

  Subsequently, the process proceeds to step 104 where the focus detection circuit 102 operates to start distance measurement, and the sub mirror 503 is scanned in step 105 (from FIG. 4B to FIG. 4C).

  When the scanning is completed in step 106 and the focus detection unit 300 determines that the focus is in focus in step 107, the process proceeds to step 108. If it is determined that the focus is not in focus, the process returns to step 104 and repeats the distance measurement.

  In step 108, ON / OFF determination of SW27b is performed. When SW27b is turned on, the process proceeds to step 109, where the mirror unit 500 is in the third mirror unit position (state in FIG. 2 (c)), and the process proceeds to step 110.

  In step 110, the subject image is taken into the image sensor 33, and the video signal processing circuit 104 performs image processing to perform a series of photographing operations.

  In the present invention, image processing is not relevant and will not be described.

  When the photographing operation is completed in step 110, the process proceeds to step 111, the sub mirror 503 rotates, and the mirror unit 500 returns to the first mirror unit position (the state shown in FIG. 2A) and proceeds to step 112.

  In step 112, it is determined whether SW1 7a is ON. If the photographer intends to continue photographing and keeps SW1 7a (SW1 ON state), the process returns to step 108 and the mirror unit 500 stands by with the first mirror unit position (state of FIG. 2 (a)). Then, it waits for the ON / OFF determination of SW2 7b again. If SW1 7a is OFF, the process ends.

  As described above, according to the present invention, it is possible to measure the distance by rotating the sub mirror 503 without reducing the range that can be measured. An imaging device capable of reducing the size of the focus detection unit 300 can be provided.

  Hereinafter, with reference to FIG. 7, an image pickup apparatus having a mirror driving apparatus according to a second embodiment of the present invention will be described.

  Since the electrical configuration, camera configuration, and mirror unit configuration are the same as those in the first embodiment, the description thereof is omitted.

  FIG. 7 is a flowchart showing the operation of the sub mirror 503 in the second embodiment of the present invention.

  First, in step 101, it is determined whether the focus mode is AF or MF. In the case of AF, the process proceeds to Step 102, and in the case of MF, the process proceeds to Step 109 while the sub mirror 503 is fixed.

  In step 2, a specific focal position is arbitrarily selected from a plurality of focal positions. Here, the selection may be made automatically by a known focus position detection technique.

  When SW1 7a is turned on in step 3, the process proceeds to step 104, the photometry circuit 24 is activated, and photometry is started by the photometry sensor 23. If SW1 7a is not turned on in step 103, the standby state is entered.

  Subsequently, the process proceeds to step 105 where the focus detection circuit 102 operates to start distance measurement, and the sub mirror 503 rotates to the position where the light beam enters the focus detection unit 300 at the focus position selected in step 102 in step 106. To do.

  When the rotation is finished in step 107 and the focus detection unit 300 determines that the focus is in focus in step 108, the process proceeds to step 109. If it is determined that the focus is not in focus, the process returns to step 105 and repeats the distance measurement.

  In step 109, ON / OFF determination of SW2 7b is performed. When SW2 7b is turned ON, the process proceeds to step 110, and the mirror unit 500 is in the third mirror unit position (state in FIG. 2C), and the process proceeds to step 111. .

  In step 111, the subject image is taken into the image sensor 33, and the video signal processing circuit 104 performs image processing to perform a series of photographing operations.

  In the present invention, image processing is not relevant and will not be described.

  When the photographing operation is completed in step 111, the process proceeds to step 112, the sub mirror 503 rotates, and the mirror unit 500 returns to the first mirror unit position (the state shown in FIG. 2A) and proceeds to step 111.

  In step 113, it is determined whether SW1 7a is ON. If the photographer intends to continue shooting and keeps SW1 7a (SW1 ON state), the process returns to step 109, and the mirror unit 500 stands by in the first mirror unit position (state shown in FIG. 2A). Then, it waits for the ON / OFF determination of SW2 7b again. If SW1 7a is OFF, the process ends.

  As described above, according to the present invention, it is possible to measure the distance by rotating the sub mirror 503 to a position where a light beam enters a specific focal position arbitrarily or automatically selected from a plurality of focal positions. An imaging device can be provided.

  Hereinafter, with reference to FIG. 8, an imaging apparatus having a mirror driving apparatus according to a third embodiment of the present invention will be described.

  Since the electrical configuration, camera configuration, and mirror unit configuration are the same as those in the first embodiment, the description thereof is omitted.

  FIG. 8 is a flowchart showing the operation of the sub mirror 503 in the third embodiment of the present invention.

  First, in step 101, it is determined whether the focus mode is AF or MF. In the case of AF, the process proceeds to Step 102, and in the case of MF, the process proceeds to Step 109 while the sub mirror 503 is fixed.

  When SW1 7a is turned on in step 2, the process proceeds to step 103, the photometry circuit 24 is activated, and photometry is started by the photometry sensor 23. If SW1 7a is not turned on in step 102, the standby state is entered.

  In step 104, subject detection is performed by the photometric sensor 23 using a known subject recognition technique. Subsequently, the process proceeds to step 105, where the focus detection circuit 102 operates, and the sub mirror 503 rotates to the subject position detected in step 104 in step 106.

  When the rotation is finished in step 107 and the focus detection unit 300 determines that the focus is in focus in step 108, the process proceeds to step 109.

  In step 109, it is determined whether or not the subject is moving before SW2 7b is turned on in step 110. The subject movement is determined by the photometric sensor 23 using a known subject recognition technique.

  If it is determined in step 109 that the amount of movement of the subject is equal to or smaller than the predetermined value, it is determined that the focus is not affected, and the process proceeds to step 110. If the amount of movement of the subject is equal to or greater than the predetermined value, it is determined that the focus is affected, and the process proceeds to step 105.

  In step 110, ON / OFF determination of SW2 7b is performed. When SW27b is turned on, the process proceeds to step 111, and the mirror unit 500 becomes the third mirror unit position (state in FIG. 2C), and the process proceeds to step 112.

  In step 112, the subject image is taken into the image sensor 33, the image signal processing circuit 104 performs image processing, and a series of shooting operations are performed.

  In the present invention, image processing is not relevant and will not be described.

  When the photographing operation is completed in step 112, the process proceeds to step 113, the sub mirror 503 rotates, and the mirror unit 500 returns to the first mirror unit position (the state shown in FIG. 2A) and proceeds to step 114.

  In step 114, it is determined whether SW1 7a is ON. When the photographer intends to continue photographing and keeps SW1 7a (SW1 ON state), the process returns to step 110 and the mirror unit 500 stands by with the first mirror unit position (state of FIG. 2 (a)). Then, it waits for the ON / OFF determination of SW2 7b again. If SW1 7a is OFF, the process ends.

  As described above, according to the present invention, the presence / absence of movement of the subject is determined, and if it is determined to move, the distance of the sub-mirror 503 is rotated according to the position of the distance measuring point after the movement. It is possible to provide an imaging device capable of

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

4 finder optical system, 7 shutter button, 7a SW1, 7b SW2,
23 photometry means, 00 focus detection means, 33 image sensor, 501 main mirror,
502 Main mirror holder, 503 Sub mirror, 504 Sub mirror holder

Claims (4)

The image sensor (33), the focus detection means (300), the photometry means (23), the finder optical system (4) provided with the photometry means (23), and the focus detection means (300) start distance measurement. Operating member (7) having SW1 (7a) for performing recording and SW2 (7b) for starting recording on the imaging device, an observation position for guiding a subject light beam to the finder optical system (4), and the imaging device A main mirror holder (502) having a main mirror (501) that can be rotated between an imaging position that does not block the subject light flux to (33), and the main mirror holder (502) are engaged with each other to detect the focus. A first mirror unit position for guiding the subject luminous flux to the sensor unit (300), a second mirror unit position that rotates to the observation position of the main mirror holder (502), and the main mirror In the imaging apparatus having a sub-mirror holder (504) having a Horuda (502) a third controllable submirror mirror unit position pivots to the photographing position of the (503),
A mirror driving device characterized in that distance measurement is performed by rotating a sub mirror holder (504) between the first mirror unit position and the second mirror unit position by starting distance measurement. Imaging device. There are a plurality of focus detection areas, and it is possible to set a mode for automatically selecting a focus position. When this mode is set, focus adjustment control is performed by rotating the sub mirror holder (504) position within a predetermined range, The imaging apparatus having a mirror driving device according to claim 1, wherein a focal position is selected. It is possible to set a mode for controlling the focus adjustment in a focus detection region arbitrarily selected from among a plurality of focus detection regions. At the time of setting the mode, the sub mirror holder (504) is adjusted in accordance with the selected focus position. The imaging apparatus having the mirror driving device according to claim 1, wherein the imaging device is rotated. It is possible to set a mode for focus adjustment control of the photographing optical system with respect to a moving subject, and in this mode setting, the position of the sub mirror holder (504) is rotated in accordance with the position of the moved moving subject. An imaging apparatus comprising the mirror driving device according to claim 1.