JP2014134748A - Mirror unit and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an influence of a reflection of light by a positioning part for positioning a mirror part.SOLUTION: The mirror unit comprises: a mirror part; a positioning part that positions the mirror part at a first position; and a drive part that, when the mirror part is moved from the first position to a second position, drives the positioning part toward a direction where the positioning part separates from the first position. An imaging device comprises: a mirror unit that includes the mirror part, the positioning part positioning the mirror part at the first position, and, when the mirror part is moved from the first position to the second position, the drive part driving the positioning part toward the direction where the positioning part separates from the first position; and an imaging part that images a subject by light coming from the subject through the mirror unit.

Description

  The present invention relates to a mirror unit and an imaging apparatus.

There is known a stopper member that positions the mirror member so that the mirror member intersects the optical axis of the photographing lens at 45 ° in a state where the subject light beam transmitted through the photographing lens is reflected by the mirror member and guided to the finder optical system.
[Prior art documents]
[Patent Literature]
[Patent Document 1] JP-A-5-181194

  In the mirror unit, there has been a problem that the influence of light reflection by the positioning portion for positioning the mirror portion cannot be suppressed.

  In the first aspect of the present invention, the mirror unit includes a mirror unit, a positioning unit that positions the mirror unit at the first position, and the first mirror unit when the mirror unit is moved from the first position to the second position. A drive unit that drives the positioning unit in a direction away from the position. The imaging apparatus includes the mirror unit and an imaging unit that captures an image of the subject using light from the subject that has passed through the mirror unit.

  In the second aspect of the present invention, the mirror unit includes a mirror unit that moves between the first position and the second position, and at least a part of the mirror unit that moves from the first position to the second position. A drive unit that drives the mirror unit from the second position to the first position with a drive parameter corresponding to the required time required to move the section.

  In a third aspect of the present invention, an imaging apparatus includes the mirror unit and an imaging unit that images the subject with light from the subject that has passed through the mirror unit.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

1 is a schematic cross-sectional view of a single-lens reflex camera 100. FIG. FIG. 2 is a cross-sectional view of the mirror unit 401 when viewed from the back side of the sheet of FIG. FIG. 2 is a cross-sectional view of the mirror unit 401 when viewed from the back side of the sheet of FIG. FIG. 2 is a side view of a driving unit 400 included in a mirror unit 401 when viewed from the front side of the sheet of FIG. The perspective view which looked at a part of mirror unit 401 from back lower direction is shown. The perspective view which looked at a part of mirror unit 401 from the front upper direction is shown. A part of the mirror unit 401 when the main mirror 382 is in the approach position is shown. FIG. 2 is a cross-sectional view of the mirror unit 401 when viewed from the back side of the sheet of FIG. FIG. 2 is a cross-sectional view of the mirror unit 401 when viewed from the back side of the sheet of FIG. The side view at the time of seeing the drive part 400 from the near side of the paper surface of FIG. 1 is shown. The perspective view which looked at a part of mirror unit 401 from back lower direction is shown. The perspective view which looked at a part of mirror unit 401 from the front upper direction is shown. A part of the mirror unit 401 when the main mirror 382 is in the retracted position is shown. A partial cross-sectional view of the mirror unit 401 during the movement of the main mirror 382 from the retracted position to the entry position is shown. It is a perspective view at the time of seeing the cross section of the mirror unit 401 in case the main mirror 382 exists in a retracted position from diagonally left back. An example of changing the drive parameters of the motor 430 based on the temperature and the power supply voltage is shown in a table format. An example of an operation flow for continuous shooting is shown.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 is a schematic cross-sectional view of a single-lens reflex camera 100. The single-lens reflex camera 100 is an example of an imaging device. The single lens reflex camera 100 includes a lens unit 200 and a camera body 300.

  In the description of the single-lens reflex camera 100, the direction from the camera body 300 to the lens unit 200 may be described as “front”, and the direction from the lens unit 200 to the camera body 300 may be described as “rear”.

  The lens unit 200 includes a fixed cylinder 210, a lens group 220, a lens group 230, a lens group 240, a lens MPU 250, and a lens side mount portion 260. The lens side mount portion 260 is provided at the rear end of the fixed cylinder 210. The lens side mount part 260 couples the lens unit 200 to the camera body 300 by fitting with the body side mount part 360 disposed on the front surface of the camera body 300.

  The lens unit 200 is detachably attached to the camera body 300. The coupling between the lens side mount portion 260 and the body side mount portion 360 can be released by a predetermined operation. Another lens unit can be coupled to the body side mount part 360.

  The lens group 220, the lens group 230, and the lens group 240 are arranged along the optical axis X inside the fixed cylinder 210 to form an optical system. Some or all of the lens group 220, the lens group 230, and the lens group 240 move along the optical axis X. When a part or front part of the lens group 220, the lens group 230, and the lens group 240 moves along the optical axis X, the magnification and focus position of the optical system change.

  The lens MPU 250 controls each part of the lens unit 200. The lens MPU 250 is responsible for communication with the main body MPU 322 of the camera body 300. Thereby, the lens unit 200 attached to the camera body 300 operates in cooperation with the camera body 300.

  In the camera body 300, a mirror box 402 is provided behind the lens unit 200 from the body-side mount portion 360. The mirror box 402 includes a movable mirror unit including a main mirror holding unit 381, a main mirror 382, a sub mirror holding unit 385, and a sub mirror 386, a focusing screen 346, a focal plane shutter 310, and a light shielding unit 380. The light shielding unit 380 has an inner surface 406 and an outer surface 407 outside the inner surface 406. The movable mirror part is provided in a space surrounded by the inner surface 406.

  The main mirror holding unit 381 holds the main mirror 382. The main mirror holding portion 381 is pivotally supported with respect to the camera body 300 by the main mirror rotation shaft 383 on the rear end side. The main mirror holding unit 381 rotates around the main mirror rotation shaft 383 while holding the main mirror 382.

  The sub mirror holding unit 385 holds the sub mirror 386. The sub mirror holding portion 385 is pivotally supported with respect to the main mirror holding portion 381 by the sub mirror rotation shaft 387 on the rear end side. Therefore, the sub mirror 386 rotates around the sub mirror rotation axis 387 with respect to the main mirror holding portion 381. When the main mirror holding part 381 rotates around the main mirror rotating shaft 383, the sub mirror 386 and the sub mirror holding part 385 move together with the main mirror holding part 381 in the camera body 300 while moving relative to the main mirror holding part 381. Rotate.

  When the main mirror holding portion 381 contacts the positioning pin 384, the main mirror 382 is positioned at the entry position. The main mirror holding portion 381 rotates around the main mirror rotation shaft 383 in the clockwise direction in FIG. 1 from the state where the main mirror 382 is in the approach position. As a result, the main mirror 382 moves to the retracted position. The dotted line in FIG. 1 shows a state where the main mirror 382 is in the retracted position. In the description of the single-lens reflex camera 100, when describing the rotation direction of the main mirror holding portion 381, etc., unless otherwise specified, the description is made using the rotation direction when the single-lens reflex camera 100 is viewed from the direction shown in FIG. To do.

  When the main mirror 382 is at the entry position, the main mirror 382 enters the optical path of incident light that has entered through the optical system of the lens unit 200. When the main mirror 382 is at the entry position, the main mirror 382 obliquely crosses the optical path of incident light that has entered through the optical system of the lens unit 200. When the main mirror 382 is in the approach position, the reflecting surface of the main mirror 382 makes an angle of about 45 ° with the optical axis X.

  When the main mirror 382 is at the entry position, a part of the light beam incident on the main mirror 382 passes through a half mirror region formed on a part of the main mirror 382 and enters the sub mirror 386. The light incident on the sub-mirror 386 is reflected toward the focal position detection optical system 390 including the lens 399, and enters the focal position detection sensor 392 through the focal position detection optical system 390 disposed below the mirror box 402.

  The focal position detection sensor 392 detects the defocus amount in the optical system of the lens unit 200 and outputs it to the main body MPU 322. The main body MPU 322 communicates with the lens MPU 250 and moves any of the lens group 220, the lens group 230, and the lens group 240 so as to cancel the detected defocus amount. Thus, the subject can be imaged by the imaging element 370 in a state where the subject is in focus.

  The surroundings of the main mirror 382 and the sub mirror 386 are surrounded by a focusing screen 346 located above in FIG. 1, a focal plane shutter 310 located behind, and a light shielding unit 380 located below. In addition, the light shielding portion 380 surrounds the main mirror 382 and the sub mirror 386 on the near side and the far side with respect to the paper surface of FIG. Note that when describing the positional relationship in the description of the single-lens reflex camera 100, the direction corresponding to the upper part of FIG. 1 is described as “up” and the direction corresponding to the lower part of FIG. To do.

  Incident light on the main mirror 382 and the sub mirror 386 is limited to incident light incident through the body-side mount unit 360. The reflection of light on the inner surface 406 of the light shielding portion 380 is suppressed. For example, the reflection of light on the inner surface 406 of the light shielding unit 380 is suppressed by flocking paper or antireflection processing. Thereby, since the scattered light generated in the mirror box 402 is suppressed from entering the image sensor 370, flare or the like in the captured image is suppressed.

  When the main mirror 382 is at the entry position, the main mirror 382 reflects a part of the incident light toward the focusing screen 346. The focusing screen 346 is disposed at a position optically conjugate with the imaging surface of the imaging element 370, and visualizes a subject image formed by the optical system of the lens unit 200.

  A pentaprism 344 is provided above the focusing screen 346 when viewed from the main mirror 382 side. A finder optical system 342 is disposed behind the pentaprism 344. The rear end of the viewfinder optical system 342 is exposed as a viewfinder 340 on the back surface of the camera body 300.

  The subject image connected to the focusing screen 346 is observed from the viewfinder 340 through the pentaprism 344 and the viewfinder optical system 342. The subject image through the pentaprism 344 is observed as an erect image from the finder 340.

  A part of the subject light beam emitted from the pentaprism 344 is received by the photometric sensor 350 disposed above the finder optical system 342. The photometric sensor 350 detects the luminance, color distribution, etc. of the incident light beam. The photometric sensor 350 outputs a signal indicating the detected luminance, color distribution, etc. to the main body MPU 322. The main body MPU 322 performs exposure control based on the signal output from the photometric sensor 350.

  From the rear of the mirror box 402, a focal plane shutter 310, an optical filter 372, and an image sensor 370 are sequentially arranged. Focal plane shutter 310 has a front curtain and a rear curtain that open and close individually.

  The optical filter 372 is installed in front of the image sensor 370 and removes components outside the visible band from incident light incident on the image sensor 370. Further, the optical filter 372 protects the surface of the image sensor 370.

  The optical filter 372 is a low-pass filter that reduces the spatial frequency of incident light. Thereby, moire generated when incident light having a spatial frequency exceeding the Nyquist frequency of the image sensor 370 enters the image sensor 370 is suppressed.

  The image sensor 370 disposed behind the optical filter 372 is formed by a photoelectric conversion element such as a CCD sensor or a CMOS sensor. A main substrate 320 and a rear display unit 330 are sequentially disposed behind the image sensor 370. A main body MPU 322, an image processing unit 324, and the like are mounted on the main board 320. The rear display unit 330 is formed of a liquid crystal display panel or the like, and is exposed on the rear surface of the camera body 300.

  In the single-lens reflex camera 100, the main mirror 382 is set to the entry position and the camera stands by for photographing. Therefore, the user can determine an imaging target by observing an image formed by incident light through the finder 340 through the optical system of the lens unit 200.

  When the release button is pressed halfway with the main mirror 382 in the approach position, the photometric sensor 350 detects the subject brightness from the incident light flux. The main body MPU 322 calculates imaging conditions such as an aperture value, a shutter speed, and ISO sensitivity according to the detected subject luminance.

  Thereby, the single-lens reflex camera 100 will be in the state which can image | photograph a to-be-photographed object on suitable imaging conditions. Further, depending on the operation mode of the single-lens reflex camera 100, the main body MPU 322 may focus the optical system of the lens unit 200 on the subject when the release button is half-pressed.

  In the single-lens reflex camera 100, when the release button is fully pressed, the photographing operation is started. Specifically, the main mirror holding portion 381 rotates clockwise around the main mirror rotation shaft 383 together with the main mirror 382, contacts the buffer member 388, and stops substantially parallel to the optical axis X. . When the main mirror 382 is stopped at the retracted position, the main mirror holding portion 381 is in contact with the buffer member 388. The buffer member 388 is formed of, for example, an elastic material, and relieves an impact when the main mirror holding portion 381 comes into contact. Thus, when the main mirror 382 is in the retracted position, the main mirror 382 is substantially retracted from the optical path of the subject light flux toward the image sensor 370 through the optical system of the lens unit 200.

  When the main mirror 382 rotates around the main mirror rotation shaft 383 from the entry position toward the retracted position, the sub mirror holding unit 385 rotates around the sub mirror rotation shaft 387 while moving up with the main mirror holding unit 381. The sub mirror holding unit 385 stops substantially parallel to the optical axis X when the main mirror 382 is stopped at the retracted position. As a result, the sub mirror 386 is also retracted from the optical path of the subject light flux.

  When the main mirror 382 and the sub mirror 386 are moved to the retracted position, the front curtain of the focal plane shutter 310 is opened in the camera body 300. The subject light flux passes through the optical filter 372 and enters the image sensor 370.

  The rear curtain of the focal plane shutter 310 closes, and the main mirror 382 and the sub mirror 386 move from the retracted position to the entry position. In this way, the operation of the mirror unit in one shooting operation is completed. Thus, the main mirror 382 and the sub mirror 386 reciprocate between the entry position and the retracted position.

  The image sensor 370 outputs a pixel signal based on the received subject light beam to the image processing unit 324. The image processing unit 324 generates image data for recording based on the pixel signal output from the image sensor 370 and records it on a recording medium such as a memory card.

  The retraction position of the main mirror 382 is located above the entry position. Therefore, an operation in which the main mirror 382 rotates from the entry position toward the retraction position may be described as “raising” or the like. For the same reason, an operation in which the main mirror 382 rotates from the retracted position toward the entry position may be described as “down”.

  As the main mirror 382 rotates reciprocally, the positioning pin 384 also reciprocates. Specifically, when the main mirror 382 is in the approach position, the positioning pin 384 is in the position indicated by the solid line in FIG. More specifically, the positioning pin 384 is located inside the inner surface 406 of the light shielding unit 380. When the main mirror 382 moves from the entry position to the retracted position, the positioning pin 384 moves from the position indicated by the solid line in FIG. 1 to the position indicated by the dotted line in FIG. Specifically, the positioning pin 384 moves to a position substantially below the inner surface 406 of the light shielding portion 380. Therefore, irregular reflection of light by the positioning pin 384 can be suppressed. When the main mirror 382 moves from the retracted position to the entry position, the positioning pin 384 moves from the position indicated by the dotted line in FIG. 1 to the position indicated by the solid line.

  2 to 7 show a part of the mirror unit 401 when the main mirror 382 is in the approach position. 2 and 3 are cross-sectional views of the mirror unit 401 when viewed from the back side of the paper surface of FIG. FIG. 4 is a side view of the driving unit 400 included in the mirror unit 401 when viewed from the front side of the sheet of FIG. FIG. 5 is a perspective view of a part of the mirror unit 401 as viewed from the rear lower side of the heel side. FIG. 6 is a perspective view of a part of the mirror unit 401 as viewed from the front upper side on the heel side. FIG. 7 shows a front view when a part of the mirror unit 401 is viewed from the front.

  8 to 13 show a part of the mirror unit 401 when the main mirror 382 is in the retracted position. 8 and 9 are sectional views of the mirror unit 401 when viewed from the back side of the paper surface of FIG. FIG. 10 is a side view of the drive unit 400 when viewed from the front side of the sheet of FIG. FIG. 11 is a perspective view of a part of the mirror unit 401 as viewed from the rear lower side of the heel side. FIG. 12 is a perspective view of a part of the mirror unit 401 as viewed from the front upper side on the heel side. FIG. 13 shows a front view when a part of the mirror unit 401 is viewed from the front.

  FIG. 14 is a partial cross-sectional view of the mirror unit 401 in the middle of the main mirror 382 moving from the retracted position to the entry position. FIG. 14 is a cross-sectional view of the mirror unit 401 when viewed from the back side of the sheet of FIG. FIG. 15 is a perspective view of the cross section of the mirror unit 401 when the main mirror 382 is in the retracted position as viewed from the rear lower side of the heel side.

  The mirror unit 401 includes a movable mirror unit 393 including at least a main mirror holding unit 381, a main mirror 382, a sub mirror holding unit 385, and a sub mirror 386, and a driving unit 400. The drive unit 400 is disposed on the front side of the sheet of FIG. 1 and on the side of the main mirror 382. The light shielding unit 380 includes at least a mirror box structure 470, a bottom frame 473, and a flocked paper 481. At least a part of the outer surface 407 of the light shielding unit 380 is provided by the mirror box structure 470 and the bottom frame 473. At least a part of the inner surface 406 of the light shielding unit 380 is provided by the flocked paper 481. At least a part of the internal space where the movable mirror part 393 is provided in the mirror box 402 is determined by the flocked paper 481.

  2 and 8, the drive unit frame 410 and the light shielding unit 380 are not shown for the purpose of illustrating the drive unit 400 in more detail. In FIGS. 3 and 9, the drive unit frame 410, the movable mirror unit 393, the light shielding unit 380, and the like are not shown for the purpose of illustrating the drive unit 400 in more detail. In FIG. 6 and FIG. 12, the movable mirror portion 393 and the like are not shown. 7 and 13, a part of the mirror box structure 470 is not shown.

  The drive unit 400 includes a motor 430, a mirror drive lever 480, a positioning pin drive lever 490, a relay gear 452, a mirror drive gear 456, and a balancer lever drive gear 458. The motor 430 is an example of a rotary actuator. Electric power is supplied to the motor 430 from a battery detachably attached to the single-lens reflex camera 100. The battery may be a secondary battery. Electric power may be supplied to the motor 430 from an external AC power supply. Power is supplied to each part of the single-lens reflex camera 100 from a power source such as a battery or an AC power source. For example, power is supplied from the power source to the main body MPU 322 and the image processing unit 324.

  The motor 430 can rotate the drive shaft 432 of the motor 430 forward or backward depending on the polarity of the drive current to be supplied. A pinion gear 434 is attached to the tip of the drive shaft 432 and transmits the rotational driving force of the drive shaft 432 to the outside.

  The relay gear 452, the mirror drive gear 456, and the balancer lever drive gear 458 are pivotally supported by a rotation shaft parallel to the drive shaft 432 from the drive unit frame 410 formed of sheet metal. A train wheel including pinion gear 434, relay gear 452, mirror drive gear 456, and positioning pin drive gear 458 is housed in drive unit cover 420. The drive unit cover 420 forms a housing together with the drive unit frame 410. The motor 430 is fixed to the outer surface of the drive unit cover 420.

  The relay gear 452 has a large-diameter gear portion 451 with a large number of teeth and a small-diameter gear portion 453 with a small number of teeth coaxially and integrally. The diameter of the small diameter gear portion 453 is smaller than the diameter of the large diameter gear portion 451. Large diameter gear portion 451 meshes with pinion gear 434. Therefore, the rotational driving force of the drive shaft 432 is transmitted to the large diameter gear portion 451 via the pinion gear 434. That is, the rotational driving force of the drive shaft 432 is transmitted to the relay gear 452.

  The small diameter gear portion 453 meshes with the mirror drive gear 456, and the mirror drive gear 456 meshes with the positioning pin drive gear 458. Therefore, the rotation of the relay gear 452 is sequentially transmitted to the mirror drive gear 456 and the positioning pin drive gear 458. Since the rotational driving force is decelerated by the relay gear 452, the mirror driving gear 456 and the positioning pin driving gear 458 are driven with a larger driving torque.

  The mirror drive gear 456 and the positioning pin drive gear 458 mesh directly with each other. Therefore, mirror drive gear 456 and positioning pin drive gear 458 rotate in conjunction with each other. Further, the rotation directions of the mirror drive gear 456 and the positioning pin drive gear 458 are opposite to each other.

  The mirror drive gear 456 integrally has a sector-like bumper 454 raised from the side surface. A stopper 440 fixed to the drive unit cover 420 is located on the side of the mirror drive gear 456. The stopper 440 has a sector shape coaxial with the bumper 454.

  Therefore, the rotation of the mirror drive gear 456 is restricted when the bumper 454 contacts the stopper 440. As a result, the mirror drive gear 456 reciprocally rotates in a range from the position where the bumper 454 contacts the upper surface of the stopper 440 to the position where the bumper 454 contacts the lower surface of the stopper 440. Since the positioning pin drive gear 458 meshes with and interlocks with the mirror drive gear 456, the positioning pin drive gear 458 also reciprocates within a range that can rotate in conjunction with the mirror drive gear 456.

  A mirror drive cam 455 is disposed on the surface of the mirror drive gear 456 on the main mirror holding portion 381 side. The mirror drive cam 455 has a log profile like a cam with a logarithmic spiral around the rotation axis of the mirror drive gear 456. Therefore, the radial distance between the rotation shaft of the mirror drive gear 456 and the cam profile surface changes according to the rotation of the mirror drive gear 456.

  The mirror drive lever 480 is arranged in the front-rear direction of the single-lens reflex camera 100 on the side of the mirror drive gear 456 side of the main mirror holding portion 381. The front end of the mirror drive lever 480 is pivotally supported by a lever rotation shaft 482 parallel to the main mirror rotation shaft 383. On the upper surface of the rear end of the mirror drive lever 480, a cam follower 484 that receives a driving force from a mirror drive cam 455 included in the mirror drive gear 456 is provided.

  The mirror drive lever 480 is biased by a mirror drive spring 489 in a direction to rotate counterclockwise around the lever rotation shaft 482. A cam follower 484 formed at the end of the mirror drive lever 480 comes into contact with the mirror drive cam 455 formed on the mirror drive gear 456 from below. Thereby, the mirror drive lever 480 is positioned.

  As shown in FIG. 5, the main mirror holding portion 381 has a mirror drive pin 391 that protrudes in parallel with the main mirror rotation shaft 383 toward the mirror drive lever 480 from the side surface of the main mirror holding portion 381. A mirror biasing spring 389 is attached to the mirror driving pin 391. The mirror biasing spring 389 biases the main mirror holding portion 381 in the direction in which the main mirror holding portion 381 rotates counterclockwise. That is, the mirror biasing spring 389 biases the main mirror holding portion 381 in the direction in which the main mirror 382 is lowered. As a result, the main mirror holding portion 381 is positioned in contact with the positioning pin 384, and the main mirror 382 is positioned at the entry position.

  When the mirror drive gear 456 rotates in the direction in which the diameter of the mirror drive cam 455 gradually increases at the position of the cam follower 484 of the main mirror drive lever 480, the cam follower 484 is pushed down. As a result, the main mirror drive lever 480 rotates clockwise around the lever rotation shaft 482 against the urging force of the mirror drive spring 489. On the other hand, when the mirror drive gear 456 rotates in the direction in which the diameter of the mirror drive cam 455 gradually decreases at the position of the cam follower 484, the main mirror drive lever 480 rotates counterclockwise around the lever rotation shaft 482 according to the urging force of the mirror drive spring 489. Rotate around.

  Therefore, when moving the main mirror 382 from the entry position to the retracted position, the motor 430 is driven in a direction in which the mirror drive gear 456 rotates clockwise. When the mirror drive gear 456 rotates in the clockwise direction and the interval between the cam profile and the rotation axis becomes narrow, the cam follower 484 of the mirror drive lever 480 is pushed up from below. Therefore, the cam follower 484 of the mirror drive lever 480 moves up along the mirror drive cam 455.

  The mirror drive lever 480 has a drive force transmission part 486 provided adjacent to the cam follower 484. The mirror driving pin 391 is provided in the driving force transmitting portion 486 so as to be in contact with the mirror driving lever 480. Specifically, the driving force transmission unit 486 of the mirror driving lever 480 is provided so as to be able to contact the mirror driving pin 391 of the main mirror holding unit 381 from below. Therefore, the mirror drive lever 480 can drive the main mirror holding portion 381 in the direction in which the main mirror holding portion 381 is rotated clockwise around the main mirror rotation shaft 383. The mirror drive spring 489 has a biasing force that rotates the mirror drive lever 480 around the lever rotation shaft 482 against the biasing force of the mirror biasing spring 389. Therefore, the mirror drive spring 489 can overcome the biasing force of the mirror biasing spring 389 and rotate the mirror drive lever 480 counterclockwise around the lever rotation shaft 482. Therefore, when the mirror drive gear 456 rotates clockwise and the interval between the cam profile and the rotation axis becomes narrower, the mirror drive pin 391 is pushed up by the drive force transmission unit 486 and the main mirror holding unit 381 rotates the main mirror. Rotate around axis 383 clockwise.

  Positioning pin drive lever 490 is driven by positioning pin drive gear 458 and positioning pin drive cam 457. One end of the positioning pin drive lever 490 is supported from the drive unit frame 410 so as to be rotatable around a lever rotation shaft 492 parallel to the main mirror rotation shaft 383. The positioning pin drive lever 490 is urged counterclockwise around the lever rotation shaft 492 by a positioning pin drive spring 499 mounted around the lever rotation shaft 492.

  The other end of the positioning pin drive lever 490 has a cam follower 494 formed integrally with the positioning pin drive lever 490. The cam follower 494 is provided at a position where it can come into contact with the positioning pin drive cam 457 formed integrally with the positioning pin drive gear 458 from below. The positioning pin drive spring 499 biases the positioning pin drive lever 490 in a direction to rotate counterclockwise. That is, the positioning pin drive spring 499 biases the cam follower 494 in a direction in which the cam follower 494 is pressed against the cam profile surface of the positioning pin drive cam 457.

  When the main mirror 382 is in the entering position, the cam follower 494 of the positioning pin drive lever 490 faces a position where the cam profile of the positioning pin drive cam 457 becomes a small diameter. At this time, the positioning pin drive lever 490 abuts on the eccentric pin 496 and the counterclockwise rotation is restricted. Therefore, the counterclockwise rotation position of the positioning pin drive lever 490 is defined by the position of the peripheral surface of the eccentric pin 496.

  The eccentric pin 496 is fixed to the drive unit frame 410 and protrudes in parallel with the main mirror rotation shaft 383 toward the movable mirror unit 393. The eccentric pin 496 can be rotated around a rotation axis shifted from the center of the cylindrical peripheral surface, and can be fixed. Therefore, by rotating the eccentric pin 496, the peripheral surface can be displaced, and the stop position of the positioning pin drive lever 490 can be adjusted. As shown in FIG. 6, a through-hole 477 is formed in the side portion 475 of the mirror box structure 470 at a position corresponding to the position of the eccentric pin 496. The eccentric pin 496 extends into the through hole 477. Therefore, the eccentric pin 496 can be rotated through the through-hole 477 from the internal space of the mirror box 402. Thereby, the position of the peripheral surface of the eccentric pin 496 can be adjusted.

  The positioning pin drive lever 490 has a positioning pin 384 made of metal at a position between the lever rotation shaft 492 and the cam follower 494. The positioning pin 384 extends from the side surface of the positioning pin drive lever 490 facing the outer surface 407 in a direction protruding from the inner surface 406 of the light shielding portion 380 in parallel with the main mirror rotation shaft 383. In this way, the positioning pin 384 protrudes from the outer side of the outer surface 407 to the inner side of the inner surface 406.

  The positioning pin 384 is formed integrally with the positioning pin drive lever 490, and moves according to the amount of rotation of the positioning pin drive lever 490 when the positioning pin drive lever 490 rotates around the lever rotation shaft 492. . When the main mirror 382 is in the approach position, the positioning pin drive lever 490 is biased in the counterclockwise direction by the biasing force of the positioning pin drive spring 499 and is positioned at a position where it abuts on the eccentric pin 496. . For this reason, the positioning pin 384 is positioned at a position adjusted in advance by the eccentric pin 496.

  As shown in FIG. 6, a through groove 476 through which the positioning pin 384 passes is formed in the side portion 475 of the mirror box structure 470. The through groove 476 has a shape along the movement path of the positioning pin 384. The positioning pin 384 protrudes from the outer side of the outer surface 407 to the inner side of the inner surface 406 through the through groove 476.

  When the main mirror 382 is in the entry position, the positioning pin 384 is located above the lower surface of the internal space of the mirror box 402. The lower surface of the internal space of the mirror box 402 is defined by a flocked paper 481 provided on the bottom 471 of the mirror box structure 470.

  The main mirror 382 is held at the entry position by stopping in a state where the main mirror holding portion 381 is in contact with the positioning pin 384. The positioning pin drive spring 499 has a force that biases the positioning pin drive lever 490 upward by overcoming the force that the mirror biasing spring 389 biases the main mirror holding portion 381 downward. Therefore, the lower limit position of the main mirror holding portion 381 can be adjusted by the position of the peripheral surface of the eccentric pin 496. That is, the entry position of the main mirror 382 can be adjusted by the position of the circumferential surface of the eccentric pin 496. Therefore, the approach position of the main mirror 382 can be adjusted by rotating the eccentric pin 496 to displace the peripheral surface.

  The side portion 475 of the mirror box structure 470 has a through groove 478 formed along the movement path of the mirror drive pin 391. The mirror driving pin 391 extends from the main mirror holding portion 381 through the through groove 478 to the position of the driving force transmission portion 486 of the mirror driving lever 480.

  The mirror driving lever 480 has two balancer ballasts 498 made of metal. The balancer ballast 498 moves in accordance with the movement of the mirror drive lever 480. The balancer ballast 498 has a weight such that the weight of the movable mirror portion 393 and the weight of the mirror driving lever 480 are substantially the same. When the main mirror 382 moves from the retracted position to the entry position, the movable mirror portion 393 collides with the positioning pin 384. In the elastic collision, as the weight of the mirror driving lever 480 is closer to the weight of the movable mirror part 393, the speed of the movable mirror part 393 immediately after the movable mirror part 393 collides with the positioning pin 384 can be minimized. It is possible to suppress the movable mirror portion 393 from bouncing greatly due to the reaction.

  The brake lever 487 suppresses the rotation of the positioning pin drive lever 490. The brake lever 487 is in contact with the peripheral portion of the lever rotation shaft 492 of the positioning pin drive lever 490. The brake spring 488 biases the brake lever 487 in a direction in which the brake lever 487 comes into contact with the peripheral portion of the lever rotation shaft 492. Therefore, when the positioning pin drive lever 490 rotates, the rotation of the positioning pin drive lever 490 is suppressed by friction with the brake lever 487. Therefore, when the movable mirror part 393 collides with the positioning pin 384, it is possible to suppress the positioning pin drive lever 490 from swinging greatly. Therefore, it is possible to suppress a strong restoring force from acting on the positioning pin driving lever 490 by the positioning pin driving spring 499, and it is possible to quickly stop the positioning pin 384 at the position where the main mirror 382 is positioned at the entry position.

  The side portion 475 of the mirror box structure 470 has a through groove 478 formed along the movement path of the balancer ballast 498. Since the through groove 478 is formed in the side wall 495, the balancer ballast 498 can be prevented from coming into contact with the side wall 495 when the positioning pin drive lever 490 rotates.

  A flocked paper is provided on the inner space side surface of the side portion 475. The flocked paper covers the openings of the through grooves 479 and the through holes 477 on the inner space side surface of the side portion 475. Therefore, the openings of the through groove 479 and the through port 477 are blocked by the flocking paper and are not exposed to the internal space.

  The sub mirror holding part 385 has a flange part 394 and a turning cam part 395. The sub mirror positioning pin 397 extends from the side portion 485 facing the side portion 475 in the mirror box structure 470 until it protrudes from the inner surface 406 in parallel with the main mirror rotation shaft 383. The sub mirror positioning pin 397 comes into contact with the flange portion 394 to position the sub mirror 386 at the entry position.

  The turning pin 396 extends from the side portion 485 until it protrudes from the inner surface 406 in parallel with the main mirror rotation shaft 383. When the main mirror holding portion 381 rotates, the turning cam portion 395 comes into contact with the turning pin 396 as the main mirror holding portion 381 rotates, and the sub mirror holding portion 385 rotates. As the sub mirror holding portion 385 rotates, the biasing direction of the toggle spring hung between the main mirror holding portion 381 and the sub mirror holding portion 385 is reversed. When the biasing force of the toggle spring is reversed, the sub mirror holding portion 385 rotates in a direction toward the main mirror holding portion 381 while the main mirror holding portion 381 is raised. On the other hand, while the main mirror holding part 381 is lowered, the sub mirror holding part 385 rotates in a direction away from the main mirror holding part 381.

  A recess 472 is formed in the bottom 471 of the mirror box structure 470. An opening 491 and a notch 483 are formed in the flocked paper 481. When the flocked paper 481 is provided in alignment with the bottom portion 471, the cutout portion 483 is located at the upper portion of the recess 472. The notch 483 has a shape corresponding to the opening shape of the recess 472.

  The bottom 471 of the mirror box structure 470 forms an opening. When the main mirror 382 is at the entry position, the subject light beam reflected by the sub mirror 386 passes through the opening 491 of the flocked paper 481 and the opening of the bottom 471 of the mirror box structure 470, and the lens of the focal position detection optical system 390. 399.

  The positioning pin drive gear 458 includes a position detection plate 459 that is spaced apart in the rotation axis direction of the positioning pin drive gear 458 and is coaxial with the positioning pin drive gear 458. The position detection plate 459 has a sector shape, and blocks the detection light of the photo interrupter 460 disposed behind the positioning pin drive gear 458 except for the vicinity of both ends of the reciprocating rotation range. Therefore, the detection result of the detection light by the photo interrupter 460 is output to the main body MPU 322. The main body MPU 322 controls the supply of drive current to the motor 430 according to the detection result of the detection light by the photo interrupter 460. For example, the main body MPU 322 blocks the supply of drive current to the motor 430 when the photo interrupter 460 detects detection light. Thereby, useless power consumption in the motor 430 can be prevented.

  When the main mirror 382 is in the approach position, the mirror drive lever 480 is in a state of having been fully rotated clockwise in the rotation range. At this time, the mirror drive spring 489 is extended and is in a state where the maximum elastic energy is accumulated within the operation cycle of the mirror drive gear 456. As a result, the main mirror holding portion 381 descends against the biasing force of the mirror biasing spring 389 and contacts the positioning pin 384.

  The biasing force of the extended mirror drive spring 489 is held by the mirror drive cam 455 that pushes the cam follower 484 of the mirror drive lever 480. For this reason, the cam follower 484 is in contact with a portion of the mirror drive cam 455 having a large diameter.

  On the other hand, the positioning pin drive lever 490 is in a state of being fully rotated counterclockwise within the rotation range. The positioning pin drive spring 499 is in a state where the urging force is released most.

  Due to the biasing force of the positioning pin drive spring 499, the positioning pin drive lever 490 is rotated counterclockwise to raise the cam follower 494. However, the cam profile of the positioning pin drive cam 457 has the smallest diameter portion facing the cam follower 494, and the cam follower 494 is separated from the cam profile of the positioning pin drive cam 457.

  In the mirror unit 401, when the main mirror 382 is moved from the approach position to the retracted position, the mirror drive gear 456 rotates clockwise. When the mirror drive gear 456 rotates clockwise, the diameter of the cam profile with which the cam follower 484 of the mirror drive lever 480 contacts gradually decreases as the mirror drive gear 456 rotates. As a result, the cam follower 484 is raised, and the mirror drive lever 480 rotates counterclockwise around the lever rotation shaft 482 while releasing the biasing force of the mirror drive spring 489. Therefore, the mirror drive lever 480 pushes up the mirror drive pin 391, and the main mirror holding portion 381 rises toward the retracted position against the biasing force of the mirror biasing spring 389.

  Further, when the mirror drive gear 456 rotates clockwise, the positioning pin drive gear 458 rotates counterclockwise in conjunction with it. Thereby, the diameter of the cam profile with which the cam follower 494 of the positioning pin drive lever 490 comes into contact gradually increases as the positioning pin drive gear 458 rotates. Therefore, the cam follower 494 is pushed down against the urging force of the positioning pin drive spring 499.

  Thus, when the main mirror 382 moves from the entry position to the retracted position, the mirror drive lever 480 rotates the main mirror holding portion 381 by the urging force that the mirror drive spring 489 opens. Further, the positioning pin driving lever 490 accumulates an urging force, that is, elastic energy, in the positioning pin driving spring 499 when the mirror driving gear 456 rotates to raise the main mirror 382.

  Therefore, the load of the motor 430 that accumulates the urging force in the positioning pin driving spring 499 is reduced by the urging force of the mirror driving spring 489 that is released. Since the load applied to the motor 430 is reduced, a smaller and smaller output motor 430 can be used. Thereby, the mirror unit 401 can be reduced in size. Further, the cost of the mirror unit 401 can be reduced. Further, the operation sound of the mirror unit 401 can be silenced.

  When the main mirror 382 moves from the entry position to the retracted position, the positioning pin 384 moves toward the recess 472. As shown in FIG. 8 to FIG. 13 and FIG. 15, when the main mirror 382 is in the retracted position, the positioning pin 384 is in a position to be accommodated in the recess 472 of the mirror box structure 470. When the main mirror 382 is in the retracted position, most of the positioning pins 384 are at a position below the upper surface of the flocked paper 481. When the main mirror 382 is in the retracted position, the upper end of the positioning pin 384 may be at a position below the upper surface of the flocked paper 481. When the main mirror 382 is in the retracted position, the positioning pin 384 may be in a state where it passes through the notch 483 and is accommodated in the recess 472. For example, when the main mirror 382 is in the retracted position, the upper end of the positioning pin 384 may be below the upper surface of the recess 472. The concave portion 472 is an example of a housing portion that houses at least a part of the positioning pin 384 when the main mirror 382 is in the retracted position. The bottom portion 471 is not limited to the concave portion 472, and may be formed with various shapes of accommodating portions. For example, the bottom portion 471 may be formed with a housing portion that penetrates to the outer surface 407.

  Thus, when the main mirror 382 is in the retracted position, the positioning pin 384 is in a state where the distance to the optical axis X is the shortest in its movable range. When the main mirror 382 is in the retracted position, the positioning pin 384 is in the state farthest from the subject luminous flux emitted from the lens unit 200. When the main mirror 382 is in the retracted position, the positioning pin 384 is in the state farthest from the subject luminous flux that is emitted from the lens unit 200 and goes straight to the image sensor 370.

  When the main mirror 382 is in the retracted position, the mirror drive lever 480 is in a state of being fully rotated clockwise in the rotation range. At this time, the mirror drive spring 489 is in a contracted state with the most urging force released.

  The released biasing force of the mirror drive spring 489 rotates the mirror drive lever 480 counterclockwise and raises the cam follower 484. However, the cam profile of the mirror drive cam 455 has the smallest diameter portion facing the cam follower 484.

  On the other hand, the positioning pin drive lever 490 is in a state of being fully rotated counterclockwise within the rotation range. The cam follower 494 is in contact with the portion where the diameter of the positioning pin drive cam 457 is large. The positioning pin drive spring 499 is in a state where the urging force is most accumulated. The cam follower 494 is in contact with the portion where the diameter of the positioning pin drive cam 457 is large. The accumulated urging force of the positioning pin driving spring 499 is held by the positioning pin driving cam 457 that presses the cam follower 494 of the positioning pin driving lever 490.

  In the mirror unit 401, when the main mirror 382 moves from the retracted position to the entry position, the mirror drive gear 456 rotates counterclockwise.

  When the mirror drive gear 456 rotates counterclockwise, the diameter of the cam profile with which the cam follower 484 of the mirror drive lever 480 contacts gradually increases as the mirror drive gear 456 rotates. As a result, the cam follower 484 is lowered, and the mirror drive lever 480 rotates clockwise while accumulating the urging force in the mirror drive spring 489. Therefore, the main mirror holding portion 381 is lowered toward the entry position by the biasing force of the mirror biasing spring 389.

  Further, when the mirror drive gear 456 rotates counterclockwise, the positioning pin drive gear 458 rotates clockwise in conjunction with it. As a result, the diameter of the cam profile with which the cam follower 494 of the positioning pin drive lever 490 contacts gradually decreases as the positioning pin drive gear 458 rotates.

  Therefore, the cam follower 494 rises while releasing the urging force of the positioning pin drive spring 499. As a result, the positioning pin 384 rises from the position accommodated in the recess 472.

  As described above, the positioning pin driving lever 490 applies the biasing force of the positioning pin driving spring 499 during the period in which the mirror driving cam 455 drives the mirror driving lever 480 and accumulates the biasing force of the mirror driving spring 489, that is, elastic energy. The positioning pin 384 is moved while being opened. Therefore, the load on the motor 430 is reduced by the biasing force of the positioning pin drive spring 499.

  As shown in FIG. 14, the positioning pin drive lever 490 is decentered at a timing before the main mirror 382 moves to the entry position after the main mirror 382 starts to descend from the state where the main mirror 382 is in the retracted position. Stops in contact with the pin 496. That is, the positioning pin 384 stops at the position where the main mirror 382 is positioned at the entry position at a timing during the movement of the main mirror 382 before the main mirror 382 is positioned at the entry position from the state where the main mirror 382 is located. It will be in the state. The cam profile of the positioning pin drive cam 457 is determined so that the positioning pin 384 moves to a position for positioning the main mirror 382 at the entry position at a timing before the main mirror 382 moves to the entry position.

  As shown in FIG. 15, a bottom frame 473 formed of sheet metal is provided near the bottom 471 of the mirror box structure 470. The bottom frame 473 is provided on the periphery of the opening formed by the bottom 471. The bottom frame 473 reinforces the bottom of the mirror box 402. Specifically, the bottom frame 473 is provided at a portion where the bottom portion 471 of the mirror box structure 470 cannot be formed thick or at a position where the mirror box structure 470 cannot be provided. The bottom frame 473 forms an opening through which the subject light beam reflected by the sub mirror 386 passes.

  The flocked paper 481 is provided on the bottom frame 473 at the periphery of the opening in the bottom frame 473. The flocked paper 481 is provided on the bottom portion 471 of the mirror box structure 470 in the portion where the bottom frame 473 is not provided in the bottom portion 471. The peripheral portion of the opening 491 of the flocked paper 481 is supported by the bottom frame 473. When the sub mirror 386 is in the approach position, the subject light beam reflected by the sub mirror 386 passes through the opening 491 of the flocked paper 481 and goes straight to the lens 399.

  The bottom frame 473 includes a frame side portion 474 that blocks a part of light directed toward the mirror box structure 470 out of the subject light flux incident on the in-focus position detection unit. The frame side portion 474 blocks a part of the light beam incident on the focus position detection unit that is reflected by a member in the focus position detection unit and directed toward the mirror box structure 470. For example, the frame side portion 474 is positioned between the flocked paper 481 and the lens 399 and extends downward from the surface of the flocked paper 481 opposite to the surface that provides the inner surface 406. The frame side portion 474 blocks a part of the light beam entering the focus position detection unit from the lens 399 or the like toward the mirror box structure 470.

  The lens 399 is provided with the optical axis inclined with respect to the direction perpendicular to the surface of the flocked paper 481 in which the opening 491 is formed. Therefore, the lens 399 has a part close to the flocked paper 481 and a part separated from the flocked paper 481. In the lens 399, the front part is close to the flocked paper 481 and the rear part is separated from the flocked paper 481. The frame side portion 474 is provided between a portion of the lens 399 that is separated from the flocked paper 481 and the flocked paper 481. As an example, the surface on the lens 399 side of the frame side portion 474 is subjected to antireflection processing for suppressing light reflection. In the frame side portion 474, the surface 1501 opposite to the surface on the lens 399 side is not subjected to antireflection processing.

  When the sub mirror 386 is in the approach position, the subject light beam reflected by the sub mirror 386 travels to the focus position detection unit including the focus position detection optical system 390 and the focus position detection sensor 392. Since the surface of the frame side portion 474 on the lens 399 side is subjected to antireflection processing, the subject luminous flux incident on the focal position detection unit is reflected by a member of the focal position detection unit, and the inside of the mirror box structure 470 Returning to can be suppressed.

  The optical axis of the lens 399 forms an acute angle with the optical axis X. Part of the subject luminous flux incident on the lens 399 is reflected by the surface of the lens 399 or the like. However, since the surface on the lens 399 side is subjected to antireflection processing in the frame side portion 474, it is possible to suppress a part of the subject light flux reflected by the surface of the lens 399 from returning to the inside of the mirror box structure 470. . It should be noted that antireflection processing may also be performed on other portions of the frame side portion 474 such as the surface 1501 of the frame side portion 474. The bottom frame 473 itself may be subjected to antireflection processing.

  Next, control of the motor 430 when the main mirror 382 is driven from the retracted position to the entry position will be described. When driving the main mirror 382 from the retracted position to the entry position, the main body MPU 322 drives the motor 430 so that the mirror drive gear 456 rotates counterclockwise so that the mirror drive lever 480 is lowered. As a result, the main mirror holder 381 starts to descend.

  After starting to drive the motor 430, the main body MPU 322 controls the motor 430 to temporarily decelerate the mirror drive lever 480 before the timing at which the main mirror holding portion 381 is predicted to contact the positioning pin 384. . Specifically, the main body MPU 322 reverses the rotation direction of the motor 430. As a result, the main mirror holding portion 381 is decelerated by the upward force received from the mirror drive lever 480 while being lowered by inertia.

  Then, after the timing at which the main mirror holding portion 381 is predicted to come into contact with the positioning pin 384, the mirror drive lever 480 is reaccelerated in the direction in which the mirror drive lever 480 is lowered. Specifically, the main body MPU 322 reverses the rotation direction of the motor 430 again. Thereby, the impact when the main mirror holding portion 381 collides with the positioning pin 384 can be suppressed. Therefore, for example, damage to members such as the sub mirror 386 and the sub mirror holding portion 385 can be suppressed. For this reason, the number of times that the movable mirror portion 393 is durable can be increased.

  Here, the mechanical operating state of the drive unit 400 may be affected by temperature. For example, the operation of a drive train such as a train wheel including a gear such as the mirror drive gear 456 and a mirror drive lever 480 may be affected by temperature. For example, when the driving force applied from the motor 430 is constant, the driving operation of the movable mirror unit 393 may be slower as the temperature is lower.

  Further, the operating state of the motor 430 may be affected by the power supply voltage. For example, when the temperature is constant, the driving force that can be generated by the motor 430 decreases as the power supply voltage decreases. Therefore, the operation of the movable mirror unit 393 may be slower as the power supply voltage is lower. Further, the power supply voltage itself varies depending on the temperature. Therefore, the entire operating state of the drive unit 400 may be affected by the power supply voltage and temperature.

  Therefore, the main body MPU 322 controls drive parameters for driving the motor 430 based on the operating state of the drive unit 400. The main body MPU 322 may control drive parameters for driving the motor 430 based on factors that affect the operating state of the drive unit 400. The main body MPU 322 may control a drive parameter for driving the motor 430 based on at least one of an operating state of the driving unit 400 and a factor that affects the operating state of the driving unit 400. The main body MPU 322 may control drive parameters for driving the motor 430 based on both the operating state of the driving unit 400 and the factors that affect the operating state of the driving unit 400. As a factor that affects the operating state of the drive unit 400, at least one of the above-described power supply voltage and temperature can be applied.

  Specifically, the main body MPU 322 controls a drive parameter when the main mirror 382 is driven from the retracted position to the entry position as a drive parameter for driving the motor 430. The drive parameters include a deceleration timing for performing control to decelerate the mirror drive lever 480, a deceleration duty that is a duty of the motor 430 when decelerating the movable mirror portion 393, an acceleration timing for performing control to reaccelerate the mirror drive lever 480, and the like. Can be illustrated.

  The operating state of the driving unit 400 may be a first time corresponding to the time required to drive the main mirror 382 from the approach position to the retracted position. The first time may be at least a part of the time required to drive the main mirror 382 from the approach position to the retracted position. The first time may be the time required for the positioning pin drive gear 458 to rotate by a certain angle, detected by the photo interrupter 460. Specifically, the first time may be a time period during which the position detection plate 459 blocks light. The operating state of the driving unit 400 may be a speed of a member driven by the driving unit 400. The speed of the member driven by the drive unit 400 may be the rotational speed of the positioning pin drive gear 458. For example, the speed of the member driven by the drive unit 400 may be an average speed during a period in which the positioning pin drive gear 458 rotates by a certain angle.

  Specifically, the main body MPU 322 controls the drive parameters based on the first time described above. For example, the main body MPU 322 delays the deceleration timing as the first time is longer. The main body MPU 322 increases the deceleration duty as the first time is longer. That is, the main body MPU 322 greatly decelerates the movable mirror portion 393 as the first time is longer. In addition, the main body MPU 322 lengthens the period during which the movable mirror unit 393 is decelerated as the first time is longer. Specifically, the main body MPU 322 increases the time from the deceleration timing to the acceleration timing as the required time is longer. Further, the main body MPU 322 delays the acceleration timing as the required time is longer.

  The main body MPU 322 stores drive parameters in association with the first time, and determines the drive parameters based on the detected first time. For example, the main body MPU 322 determines the drive parameter in the return path based on the first time detected in the forward path of the reciprocating movement when the main mirror 382 is rotated in one reciprocating rotation. That is, the drive parameter in the return path is determined based on the required time detected in the forward path in the reciprocating motion of the main mirror 382 for performing one imaging operation. Similarly, in the case where a plurality of reciprocating motions are performed, the driving parameters for the return pass may be determined based on the first time detected in the forward pass in each reciprocating motion. As described above, the drive parameter in the current frame shooting operation may be determined based on the first time in the current frame shooting operation.

  Alternatively, the drive parameter may be determined based on the first time detected in the previous reciprocating movement. The previous reciprocating motion may be the immediately preceding reciprocating motion, or may be the reciprocating motion prior to the immediately preceding reciprocating motion. As described above, the drive parameter may be determined based on the first time detected at an arbitrary time before the present time. For example, the drive parameter in the current frame shooting operation may be determined based on the first time in the shooting operation one frame before the current frame. Based on the first time in the shooting operation two or more frames before the current frame, the drive parameter in the shooting operation of the current frame may be determined.

  For example, the main body MPU 322 determines the deceleration timing and the acceleration timing using the timing based on the output from the photo interrupter 460 as a reference timing. For example, the timing at which the detection result of the detection light by the photo interrupter 460 is first inverted after the control for driving the main mirror 382 is started may be applied as the reference timing.

  Further, the main body MPU 322 may control the drive parameter based on at least one of temperature and supply voltage. For example, the main body MPU 322 delays the deceleration timing as the temperature is lower. The main body MPU 322 increases the deceleration duty as the temperature is lower. That is, the main body MPU 322 greatly decelerates the movable mirror portion 393 as the temperature is lower. Further, the main body MPU 322 lengthens the period during which the movable mirror unit 393 is decelerated as the temperature is lower. Specifically, the main body MPU 322 increases the time from the deceleration timing to the acceleration timing as the temperature is lower. Further, the main body MPU 322 delays the acceleration timing as the temperature is lower.

  The main body MPU 322 may perform the same control as the low temperature for the low supply voltage. Further, the main body MPU 322 may control drive parameters based on a combination of temperature and supply voltage. The main body MPU 322 stores drive parameters in advance in association with combinations of temperature and supply voltage, and uses the drive parameters stored in association with detected combinations of temperature and supply voltage as drive parameters of the motor 430. May be reflected.

  FIG. 16 shows, in a tabular form, drive parameters determined in association with combinations of temperature states and supply voltage states. The temperature state is divided into a high temperature state that is equal to or higher than a predetermined reference temperature and a low temperature state that is lower than the reference temperature. The supply voltage state is divided into a high voltage state equal to or higher than a predetermined reference voltage and a low voltage state lower than the reference voltage. Drive parameters are assigned to each of the four states by these combinations.

  The drive parameter A is associated with the combination of the high temperature state and the high voltage state. The drive parameter C is associated with the combination of the low temperature state and the low voltage state. The drive parameter B is associated with the combination of the high temperature state and the low voltage state. The drive parameter B is associated with the combination of the low temperature state and the high voltage state.

  As an example, the deceleration timing in the drive parameter C is later than the deceleration timing in the drive parameter A. Further, the deceleration timing in the drive parameter C is later than the deceleration timing in the drive parameter B. Further, the deceleration timing in the drive parameter B is later than the deceleration timing in the drive parameter A.

  When determining the drive parameter, the main body MPU 322 specifies the drive parameter based on the first time when the main mirror 382 is driven from the entry position to the retracted position. Further, the main body MPU 322 specifies a drive parameter based on the temperature and the supply voltage. The main body MPU 322 selects one of the driving parameters based on the first time and the driving parameters based on the temperature and the supply voltage, and drives the motor 430 with the selected driving parameters.

  For example, when it is determined that the drive parameter based on the temperature and the supply voltage is more suitable than the drive parameter based on the first time, the main body MPU 322 selects the drive parameter based on the temperature and the supply voltage. For example, when performing the continuous shooting operation, the main body MPU 322 may select a driving parameter in the subsequent continuous shooting operation based on the past driving result of the movable mirror unit 393 in the series of continuous shooting operations.

  As a driving result of the movable mirror unit 393, the second time corresponding to the time required to drive the main mirror 382 from the retracted position to the entry position can be applied. The second time may be at least a part of the time required to drive the main mirror 382 from the retracted position to the approach position. The second time may be a time required for the positioning pin drive gear 458 to rotate by a certain angle, which is detected by the photo interrupter 460. As a driving result of the movable mirror unit 393, the speed of a member driven by the driving unit 400 may be applied. The speed of the member driven by the drive unit 400 may be the rotational speed of the positioning pin drive gear 458. For example, the speed of the member driven by the drive unit 400 may be an average speed during a period in which the positioning pin drive gear 458 rotates by a certain angle.

  For example, the main body MPU 322 compares the predicted time predicted from the drive parameter applied in the immediately preceding photographing operation with the detected second time, and the difference between the predicted time and the second time is determined based on a predetermined value. If it is smaller, it is determined that the drive parameter applied in the immediately preceding shooting operation is suitable. When the main body MPU 322 determines that the drive parameter applied in the immediately preceding photographing operation is not suitable, the main body MPU 322 selects a drive parameter based on other information as a drive parameter to be applied in the next photographing operation. For example, when the driving parameter applied in the immediately preceding photographing operation is a driving parameter based on the first time, the driving parameter based on the temperature and the supply voltage is applied as the driving parameter in the next photographing operation.

  The drive parameters described in connection with FIG. 16 may correspond to different continuous shooting speeds. For example, the drive parameter A is a drive parameter for continuous shooting at a first continuous shooting speed, and the drive parameter B is for continuous shooting at a second continuous shooting speed slower than the first continuous shooting speed. Drive parameters. Further, the drive parameter C may be a drive parameter when performing continuous shooting at a third continuous shooting speed that is slower than the second continuous shooting speed. Therefore, when continuous shooting is performed, the continuous shooting speed may change depending on the operating environment of the movable mirror unit 393.

  FIG. 17 shows an example of an operation flow when continuous shooting is performed in the single-lens reflex camera 100. This flow is started when pressing of the release button is detected. Here, the case where the operation mode is set to perform continuous shooting while the release button is pressed will be described.

  When this flow starts, in step S1702, the main body MPU 322 drives the main mirror 382 from the entry position to the retracted position. Specifically, the motor 430 is driven with a predetermined drive parameter. At a timing when the main mirror 382 is predicted to have moved to the retracted position, the main body MPU 322 causes the image sensor 370 to perform an image capturing operation (step S1704). Pixel signals from the image sensor 370 obtained by the imaging operation are supplied to the image processing unit 324, and image data for recording is generated in the image processing unit 324 and recorded on a recording medium such as a memory card.

  The main body MPU 322 determines a drive parameter for driving the main mirror 382 from the retracted position to the entry position (step S1706). For example, the main body MPU 322 may select a driving parameter based on the first time when the main mirror 382 is driven in step S1702. The main body MPU 322 may select a drive parameter based on the current temperature and supply voltage.

  In step S1707, the main body MPU 322 drives the motor 430 with the drive parameters determined in step S1706 to drive the main mirror 382 from the retracted position to the entry position. Subsequently, the main body MPU 322 determines whether or not the release button is pressed (step S1708). When the release button is pressed, focus adjustment is performed based on the output from the focus position detection sensor 392 (step S1710), and the process proceeds to step S1702. If it is determined in step S1708 that the release button has not been pressed, the main body MPU 322 ends this flow.

  In the above description, the processing described as the operation of the main body MPU 322 is realized by the main body MPU 322 controlling each hardware included in the camera 10 according to a program. In the above description, the processing realized by the image processing unit 324 can be realized by a processor. In other words, the processing described in relation to the single-lens reflex camera 100 according to the present embodiment is performed by the processor operating in accordance with the program to control the hardware, whereby the hardware including the processor, the memory, and the like cooperate with the program. This can be realized by operating as described above. That is, the process can be realized by a so-called computer. The computer may load a program for controlling execution of the above-described processing, operate according to the read program, and execute the processing. The computer can load the program from a computer-readable recording medium storing the program.

  In the present embodiment, the mirror unit included in the single-lens reflex camera 100 has been described as an example of the mirror unit 401. However, the same mechanism and control method as the mirror unit 401 can be applied to a mirror unit included in various electronic devices other than the imaging device such as the single-lens reflex camera 100. In addition, various electric products other than electronic devices can be applied as devices including a mirror unit. Moreover, the apparatus provided with a mirror unit is not restricted to an electric product. Various devices such as electric products and mechanical products can be applied as the devices including the mirror unit.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process such as operation, procedure, step, and stage in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before”, “prior to” It should be noted that it can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

100 single lens reflex camera, 200 lens unit, 210 fixed barrel, 220, 230, 240 lens group, 250 lens MPU, 260 lens side mount, 300 camera body, 310 focal plane shutter, 320 main board, 322 main body MPU, 324 image Processing unit, 330 Rear display unit, 340 finder, 342 Finder optical system, 344 Penta prism, 346 Focusing screen, 350 Photometric sensor, 360 Body side mount unit, 370 Image sensor, 372 Optical filter, 380 Shading unit, 381 Main mirror holding , 382 Main mirror, 383 Main mirror rotation axis, 384 Positioning pin, 385 Sub mirror holding part, 386 Sub mirror, 387 Sub mirror rotation axis, 388 Buffer member, 389 Mirror bias spring, 390 Focus position detection optical system, 391 Mirror drive pin, 392 Focus position detection sensor, 393 Movable mirror part, 394 heel part, 395 Turning cam part, 396 Turning pin, 397 Sub mirror positioning pin, 400 Drive part, 401 mirror unit, 402 mirror box, 406 inner surface, 407 outer surface, 410 drive unit frame, 420 drive unit cover, 430 motor, 432 drive shaft, 434 pinion gear, 440 stopper, 451 large diameter gear unit, 452 relay gear, 453 small diameter gear 454 Bumper, 455 Mirror drive cam, 456 Mirror drive gear, 457 Positioning pin drive cam, 458 Position detection plate, 460 Photo interrupter, 470 Mirror box structure, 471 Bottom, 472 Recess, 473 474 Frame side, 475, 485 Side, 476, 478, 479 Through groove, 477 Through port, 480 Mirror drive lever, 481 Flocking paper, 482 Lever rotation shaft, 483 Notch, 482, 492 Lever rotation shaft 484, 494 Cam follower, 486 Drive force transmission part, 487 Brake lever, 488 Brake spring, 489 Mirror drive spring, 490 Positioning pin drive lever, 491 Opening, 496 Eccentric pin, 498 Balancer ballast, 499 Positioning pin drive spring, 1501 surface

Claims (13)

Mirror part,
A positioning part for positioning the mirror part in a first position;
A mirror unit comprising: a drive unit that drives the positioning unit in a direction away from the first position when the mirror unit is moved from the first position to the second position. The mirror unit reflects at least a part of light flux of incident light entering the mirror unit when in the first position, and does not reflect the at least part of light flux when in the second position. The mirror unit according to claim 1. A light-shielding part that restricts light traveling toward the mirror part;
The light-shielding portion has a recess formed in the surface on the mirror portion side,
The mirror unit according to claim 1, wherein the driving unit drives the positioning unit to the recess when the mirror unit is moved from the first position to the second position. A light-shielding part that restricts light traveling toward the mirror part;
When the positioning unit is positioning the mirror unit, at least a part of the positioning unit is located on the mirror unit side from the facing surface that is the mirror unit side surface of the light shielding unit,
When the mirror unit is moved from the first position to the second position, the driving unit moves the at least a part of the positioning unit on the opposite side of the opposing surface with respect to the facing surface. The mirror unit according to claim 1 or 2, which is driven to a position. The drive unit positions the mirror unit at the first position after the mirror unit starts to move from the second position to the first position and before the mirror unit moves to the first position. The mirror unit according to claim 1, wherein the positioning unit is driven to a position. A mirror that moves between a first position and a second position;
The mirror unit is moved from the second position to the second position with a drive parameter corresponding to a required time required to move at least a part of the section from the first position to the second position. A mirror unit comprising a drive unit that drives to one position. A positioning part for positioning the mirror part at the first position;
The drive unit according to claim 6, wherein when the mirror unit is driven from the second position to the first position, the mirror unit decelerates the mirror unit before moving to the first position. Mirror unit. The mirror unit according to claim 7, wherein the driving parameter includes at least one of a timing for decelerating the mirror unit, a time length for decelerating the mirror unit, and a driving duty for driving a motor that drives the mirror unit. The drive parameter includes a timing for decelerating the mirror unit,
The mirror unit according to claim 7 or 8, wherein the drive unit delays the timing of decelerating the mirror unit as the required time is longer. The drive unit accelerates the mirror unit at a timing when the mirror unit contacts the positioning unit when driving the mirror unit from the second position to the first position;
The drive parameter includes at least one of a timing for accelerating the mirror unit, a time length for accelerating the mirror unit, and a drive duty for driving a motor that drives the mirror unit. The mirror unit described in the item. The driving unit reciprocates between the first position and the second position,
The driving parameter in the return path for driving the mirror unit from the second position to the first position in one reciprocating motion drives the mirror unit from the first position to the second position in the one reciprocating motion. The mirror unit according to any one of claims 6 to 10, wherein the mirror unit is based on the required time in an outward path. The drive unit includes a motor that drives the mirror unit from the first position to the second position, and drives the mirror unit from the second position to the first position;
The mirror unit according to claim 6, wherein the drive parameter includes a drive parameter for driving the motor. The mirror unit according to any one of claims 1 to 12,
An imaging apparatus comprising: an imaging unit that images the subject by light from the subject that has passed through the mirror unit.

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