JP2018116320A - adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display in such a way that a stereoscopic image masked by a shield can be confirmed.SOLUTION: An adapter of the present invention comprises: a first mount part to which a camera body is attachable; a second mount part to which an interchangeable lens having a diaphragm is attachable; a moving member for moving in order to change the opening size of the diaphragm and driving a diaphragm drive part of the interchangeable lens; and a control part for correcting the amount of movement of the moving member and controlling the position of the diaphragm by misalignment between a position of the moving member where the opening size of the diaphragm is opened and a position of the moving member where the diaphragm is controlled to be opened and misalignment between a position of the diaphragm drive member where the opening size of the diaphragm is opened and a position of the diaphragm drive member where the diaphragm is controlled to be opened.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an adapter.

  The camera system has a camera body and an interchangeable lens. The camera body has a pin that regulates the relative position of the interchangeable lens with respect to the camera body in the circumferential direction around the optical axis of the interchangeable lens. The camera system adjusts the exposure amount and the depth of field by changing the aperture of the interchangeable lens to capture an image (see, for example, Patent Document 1 and Patent Document 2).

  The interchangeable lens has a diaphragm drive member that changes the aperture ratio of the diaphragm of the interchangeable lens. The aperture ratio of the diaphragm of the interchangeable lens changes due to the displacement of the diaphragm driving member. For example, the camera body rotates an annular movable member connected to the aperture driving member, a support member that supports the movable member in a circumferential direction around the optical axis of the interchangeable lens, and the movable member. And a driving device. The movable member is disposed so as to surround the optical axis of the interchangeable lens with the interchangeable lens attached to the camera body, and is connected to the aperture driving member. The driving device rotates the movable member connected to the diaphragm driving member in the rotation direction defined by the support member. Thus, the camera body changes the aperture ratio of the diaphragm by displacing the diaphragm driving member.

Japanese Patent Laid-Open No. 4-116663 Japanese Patent Laid-Open No. 4-121720

By the way, the interchangeable lens may be attached to the camera body via an adapter. At this time, the movable member, the support member, and the driving device provided in the camera body may be provided in the adapter.
The drive device is generally controlled by a control unit that controls the drive device, and transmits torque generated by an electric motor or the like to the movable member via a reduction gear train to rotate the movable member.
When controlling the aperture of the interchangeable lens, first, the movable member is moved by controlling the driving device so that the aperture drive member of the interchangeable lens is at the open aperture position, and the aperture drive member is set to the open aperture position. The drive device may be controlled to move the movable member until the drive member reaches a position corresponding to a desired aperture value.

As described above, in order to accurately control the aperture of the interchangeable lens, it is very important to accurately grasp the position of the movable member when the aperture driving member is at the open aperture position.
On the other hand, the open aperture position of the aperture driving member of the interchangeable lens varies depending on the specifications and individual differences of the interchangeable lens (there is variation). Therefore, a technique that can accurately detect the position of the movable member corresponding to the actual open aperture position of the aperture driving member even when the interchangeable lens is replaced is desired.

  The present invention has been made in view of the above circumstances, and provides an adapter capable of accurately detecting the position of the movable member when the aperture driving member of the interchangeable lens is positioned at the open aperture position. For the purpose.

  The adapter according to the first aspect of the present invention moves in order to change the aperture diameter of the aperture, the first mount portion to which the camera body can be attached and detached, the second mount portion to which the interchangeable lens having the iris can be attached and detached. A moving member that drives the diaphragm driving member of the interchangeable lens, a shift between a position of the moving member that opens the aperture diameter of the diaphragm and a position of the moving member that controls the aperture to be opened, Control that controls the position of the diaphragm by correcting the amount of movement of the moving member based on the deviation between the position of the diaphragm driving member that opens the aperture and the position of the diaphragm driving member that controls the diaphragm to open. A section.

  According to the present invention, even when the interchangeable lens is replaced, it is possible to perform aperture control based on the true open aperture state of the interchangeable lens based on the position information (open aperture position) of the aperture drive member in the fully open aperture state. An adapter can be provided.

It is a perspective view which shows the camera system of this embodiment. It is a figure which shows the function structure of the camera system of this embodiment. It is a perspective view which shows the adapter of this embodiment. It is a top view which shows the adapter of this embodiment. It is a top view which shows the 2nd mount of this embodiment, a movable member, and a drive device. It is a perspective view which shows the movable member and drive device of this embodiment. It is a top view which shows the movable member and drive device of this embodiment. It is a top view which shows the movable member, drive device, and pressing plate of this embodiment. It is a top view which shows when the movable member of this embodiment is located in the maximum opening position and the minimum opening position. It is a conceptual diagram which shows the condition of the position shift with respect to the reference position of the 1st contact part of the movable member of this embodiment, and a diaphragm drive member. It is a mechanism figure showing typically the drive system of the movable member of this embodiment.

This embodiment will be described. FIG. 1 is a perspective view showing the camera system of the present embodiment.
A camera system 1 shown in FIG. 1 includes a camera body 100, an interchangeable lens 200, and an adapter 300. The adapter 300 is attached to the camera body 100. The interchangeable lens 200 is attached to the adapter 300 on the side opposite to the camera body 100 with respect to the adapter 300.

  The camera body 100 of the present embodiment includes a first mount 11. The first mount 11 can be attached with an interchangeable lens or the like having a mount whose size matches that of the first mount 11. The mount of the interchangeable lens 200 of the present embodiment is different in size from the first mount 11. Therefore, the interchangeable lens 200 cannot be directly attached to the camera body 100. The interchangeable lens 200 can be indirectly attached to the first mount 11 via the adapter 300. That is, the adapter 300 has a mount that matches the size of the first mount 11 so that it can be directly attached to the camera body 100. Furthermore, the adapter 300 has a second mount 362 on the opposite side to which the camera body 100 is attached so that the interchangeable lens 200 can be directly attached.

  The camera body 100 of the present embodiment includes a top surface 13 located at the upper part of the side surface facing the front surface 12 on which the first mount 11 is disposed, and a back surface 14 facing the opposite side to the front surface 12. Have The camera body 100 of the present embodiment can be attached to the top surface 13 with accessories such as a flash device.

  In the present embodiment, the XYZ orthogonal coordinate system shown in FIG. 1 or the like is set, and the positional relationship of each part may be described. In this XYZ orthogonal coordinate system, the Y-axis direction is a direction substantially parallel to the optical axis AX of the interchangeable lens 200. In this XYZ orthogonal coordinate system, the X-axis direction and the Z-axis direction are directions orthogonal to the Y-axis direction and orthogonal to each other. The front surface 12 and the back surface 14 are each substantially orthogonal to the Y-axis direction. The top surface 13 is substantially orthogonal to the Z-axis direction.

  FIG. 2 is a diagram illustrating a functional configuration of the camera system according to the present embodiment. As shown in FIG. 2, in the camera system 1, the light incident on the interchangeable lens 200 enters the image sensor 110 of the camera body 100 through the interchangeable lens 200 and the adapter 300. The camera system 1 can capture an image formed on the image sensor 110 of the camera body 100 by the interchangeable lens 200 with the camera body 100.

  The interchangeable lens 200 according to the present embodiment includes a plurality of lenses 201, a diaphragm unit 202 (aperture diaphragm), a diaphragm driving member 203, a lens control unit 204, a first terminal unit 205, and a lens barrel 206. The plurality of lenses 201 refract the light incident on the interchangeable lens 200 and form an image on the light receiving surface of the image sensor 110 of the camera body 100. The aperture unit 202 changes the amount of light incident on the image sensor 110 through the plurality of lenses 201 according to the aperture ratio. The aperture driving member 203 is, for example, an aperture lever that works in conjunction with the aperture unit 202. The aperture ratio of the aperture unit 202 varies depending on the displacement of the aperture drive member 203.

  The camera system 1 can control the exposure amount and the depth of field for the image sensor 110 by controlling the aperture ratio of the aperture unit 202. The lens barrel 206 houses and protects a plurality of lenses 201, a diaphragm unit 202, and a lens control unit 204. The first terminal portion 205 is attached to the lens barrel 206. The first terminal unit 205 is connected to the lens control unit 204. The first terminal portion 205 is connected to the second terminal portion 330 of the adapter 300 in a state where the interchangeable lens 200 is attached to the adapter 300 (hereinafter referred to as a wearing state of the interchangeable lens 200). The lens control unit 204 of the present embodiment controls the positions of the plurality of lenses 201 in a direction substantially parallel to the optical axis AX, focusing control for controlling the focal positions of the plurality of lenses 201, and zoom control for controlling the zoom magnification. Etc.

  The adapter 300 according to the present embodiment includes a movable member 310, a driving device 320, a second terminal unit 330, a third terminal unit 340, and an adapter control unit 350. The movable member 310 is driven by the driving device 320 to displace the diaphragm driving member 203 of the interchangeable lens 200. The second terminal unit 330 and the third terminal unit 340 are each connected to the adapter control unit 350. The second terminal portion 330 is connected to the first terminal portion 205 of the interchangeable lens 200 when the interchangeable lens 200 is attached. The third terminal portion 340 is connected to the fourth terminal portion 120 of the camera body 100 in a state where the adapter 300 is attached to the camera body 100 (hereinafter referred to as a wearing state of the adapter 300). The adapter 300 will be described in detail later.

As shown in FIG. 1, the camera body 100 of the present embodiment includes a release button 15, a first attachment / detachment switch 16, and a housing 17 (warship part). The camera body 100 includes an image sensor 110, a fourth terminal unit 120, and a camera control unit 130, as shown in FIG.
The release button 15 of the present embodiment is disposed on the top surface 13. The camera body 100 detects that the release button 15 has been operated (half-pressed or fully pressed), and performs various processes such as an imaging process.

  The first attachment / detachment switch 16 of this embodiment is disposed on the front surface 12. The interchangeable lens 200 or the adapter 300 attached to the first mount 11 can be detached from the first mount 11 by operating the first attachment / detachment switch 16. The first attachment / detachment switch 16 is interlocked with a pin disposed on the first mount 11. This pin regulates the relative position between the camera body 100 and the adapter 300 in the circumferential direction around the optical axis AX when the adapter 300 is worn. That is, this pin regulates the relative position so that the adapter 300 does not rotate with respect to the camera body 100 in the circumferential direction around the optical axis AX when the adapter 300 is attached.

  The housing 17 of this embodiment houses and protects the image sensor 110 and the camera control unit 130. The fourth terminal portion 120 is provided on the housing 17. The fourth terminal unit 120 is connected to the third terminal unit 340 of the adapter 300 when the adapter 300 is attached. The camera body 100 of the present embodiment includes a battery that supplies power to each part in the camera body 100 and each part of the camera system 1.

  The image sensor 110 according to the present embodiment includes a plurality of pixels arranged two-dimensionally. Each pixel of the image sensor 110 includes a light receiving element such as a CCD (Charge Coupled device) or a CMOS (Complementary Metal Oxide Semiconductor) sensor. The light receiving element of the image sensor 110 generates a charge corresponding to the amount of light incident on each pixel from the interchangeable lens 200. The image sensor 110 converts the charge generated in the light receiving element by the light incident on each pixel into a signal. The image sensor 110 generates an image signal indicating an image of a subject formed on the light receiving surface of the image sensor 110 via the interchangeable lens 200.

  The camera control unit 130 of the present embodiment detects an operation indicating that the release button 15 has been operated (half-pressed or fully pressed). The camera control unit 130 controls the image sensor 110 based on the detected operation and executes an imaging process. In addition, the camera control unit 130 causes the interchangeable lens 200 to execute processing required for performing the imaging processing via the adapter 300.

  In the present embodiment, the camera control unit 130 transmits a control signal for controlling the adapter control unit 350 and a signal indicating information required for imaging via the fourth terminal unit 120 and the third terminal unit 340. Output to the controller 350. The adapter control unit 350 outputs a control signal for controlling the lens control unit 204 and a signal indicating information necessary for imaging to the lens control unit 204 via the second terminal unit 330 and the first terminal unit 205. To do. The lens control unit 204 outputs a signal indicating information required for imaging to the adapter control unit 350 via the first terminal unit 205 and the second terminal unit 330.

  The camera body 100 of this embodiment supplies power to each part in the adapter 300 via the fourth terminal part 120 and the third terminal part 340. The adapter 300 supplies the power supplied from the camera body 100 to each part in the interchangeable lens 200 via the second terminal part 330 and the first terminal part 205. The first terminal unit 205, the second terminal unit 330, the third terminal unit 340, and the fourth terminal unit 120 are respectively paired with a signal terminal for inputting / outputting a signal, a power supply terminal for supplying power, and a power supply terminal. And a ground terminal.

Next, the adapter 300 will be described in detail. FIG. 3 is a perspective view showing the adapter of the present embodiment. FIG. 4 is a plan view showing the adapter of the present embodiment.
The adapter 300 of this embodiment includes a first housing member 360, a second housing member 361, a second mount 362, a pin 363, and a second attach / detach switch 364.

  The second housing member 361 of the present embodiment houses at least a part of the drive device 320 shown in FIG. The second accommodation member 361 of the present embodiment is generally box-shaped. The second housing member 361 has a surface (hereinafter referred to as a bottom surface 365) that faces in a direction (−Z direction) intersecting the optical axis AX of the interchangeable lens 200 when the interchangeable lens 200 is attached. The bottom surface 365 has a screw hole or the like that can fix the adapter 300 to a tripod or the like. The second housing member 361 is joined to the first housing member 360 on the surface facing the bottom surface 365 (+ Z direction). The bottom portion 366 including the bottom surface 365 projects toward the outside of the adapter 300 with respect to the ceiling portion 367 including the surface joined to the first housing member 360. The bottom portion 366 is disposed so as to protrude from the ceiling portion 367 toward the interchangeable lens 200 (in the + Y direction) when the interchangeable lens 200 is attached.

  The first housing member 360 of the present embodiment houses the movable member 310, the second terminal portion 330, the third terminal portion 340, and the adapter control portion 350. The first housing member 360 is supported by the second housing member 361 in a state where the bottom surface 365 of the second housing member 361 is supported by a tripod, a desk, or the like.

  The 1st accommodating member 360 of this embodiment is cylindrical. The axial direction of the first housing member 360 is substantially parallel to the optical axis AX of the interchangeable lens 200 when the interchangeable lens 200 is attached. The first housing member 360 has a first opening 368 and a second opening 369. The first opening 368 is arranged in a direction (−Y direction) facing the camera body 100 when the adapter 300 is worn. The second opening 369 is disposed in a direction (+ Y direction) facing the interchangeable lens 200 when the interchangeable lens 200 is worn. The light incident on the adapter 300 from the interchangeable lens 200 passes through the second opening 369 and then passes through the first opening 368 and enters the camera body 100.

  The second mount 362 of this embodiment is attached to the first housing member 360. The second mount 362 is disposed on the surface facing the opposite side (+ Y direction) from the camera body 100 when the adapter 300 is attached. The second mount 362 of the present embodiment is annular. The second mount 362 has a mount surface 370 that contacts the interchangeable lens 200. At least a part of the mount surface 370 is a flat surface. The second mount 362 is disposed so that the optical axis AX of the interchangeable lens 200 passes through the center of the second mount 362 when the interchangeable lens 200 is attached.

  The second terminal portion 330 of this embodiment is disposed in the vicinity of the inner periphery of the second opening 369. A part of the second terminal portion 330 protrudes to the inside of the inner periphery of the second opening 369. The second terminal portion 330 is arranged so that the second opening 369 is sandwiched between the second terminal portion 330 and the second housing member 361. In the present embodiment, the circumferential position (rotational position) about the optical axis AX may be indicated by an angle with the position of the second terminal portion 330 as a reference (0 °). This angle is positive when viewed from one side in the optical axis direction (as viewed in the −Y direction) and negative when counterclockwise.

  The pin 363 and the second attachment / detachment switch 364 of the present embodiment are disposed at a rotation position of approximately 90 ° from the second terminal portion 330 in the circumferential direction around the optical axis AX. The pin 363 can advance and retreat in the normal direction (Y-axis direction) of the mount surface 370. For example, the pin 363 can move back and forth between a first position protruding from the mount surface 370 and a second position not protruding from the mount surface 370. The pin 363 moves forward and backward when the second attachment / detachment switch 364 is operated.

  The pin 363 of the present embodiment is inserted into a hole (not shown) provided in the interchangeable lens 200 when the pin 363 is disposed at the first position in the attached state of the interchangeable lens 200. The pin 363 restricts the relative position of the interchangeable lens 200 with respect to the adapter 300 in the circumferential direction around the optical axis AX of the interchangeable lens 200 in a state where the pin 363 is inserted into a hole provided in the interchangeable lens 200. That is, the pin 363 prevents the interchangeable lens 200 from rotating with respect to the adapter 300 in the circumferential direction around the optical axis AX of the interchangeable lens 200.

  The pin 363 is not inserted into the hole provided in the interchangeable lens 200 when the pin 363 is disposed at the second position in the wearing state of the interchangeable lens 200. Therefore, the interchangeable lens 200 can be detached from the second mount 362 when the pin 363 is disposed at the second position by the operation of the second attachment / detachment switch 364.

  FIG. 5 is a plan view showing the second mount 362, the movable member 310, and the driving device 320 of the present embodiment. The movable member 310 and the driving device 320 according to the present embodiment are disposed in a range overlapping the second mount 362 when viewed from the optical axis direction (Y-axis direction). The movable member 310 and the driving device 320 are disposed on the opposite side (−Y direction) from the interchangeable lens 200 with respect to the second mount 362. In FIG. 5, the movable member 310 and the driving device 320 are schematically illustrated through the second mount 362 and the like.

  The movable member 310 of the present embodiment has substantially the same shape (a crescent shape, a circular arc) as a portion occupying a predetermined angular range α [°] in the circumferential direction around the optical axis AX in the ring around the optical axis AX. Shape). In the present embodiment, the angle range α [°] is about 150 °. The angle range α [°] may be, for example, 180 ° or less, 120 ° or less, or 90 ° or less. The movable member 310 is provided to be rotatable by an angle (θ1 + θ2) [°] counterclockwise in the circumferential direction around the optical axis AX from the state shown in FIG.

  The driving device 320 according to the present embodiment is provided in a range that spans a region inside the inner circumference of the second mount 362 and a region outside the outer circumference of the second mount 362 when viewed from the optical axis direction (Y-axis direction). It has been. The drive device 320 of this embodiment is disposed at an angular position of approximately −150 °. The driving device 320 rotates the movable member 310 within a predetermined angular range in the circumferential direction around the optical axis AX.

  A first state where the movable member 310 is rotated to a position where it can be moved most counterclockwise, and a second state where the movable member 310 is rotated to a position where it can be moved most clockwise (maximum opening position described later). Thus, the rotational position of one end of the movable member 310 in the circumferential direction around the optical axis AX changes by an angle (θ1 + θ2) [°]. That is, the first range A1 in which the movable member 310 is rotatable is a section corresponding to the circumferential angular range (α + θ1 + θ2) [°] around the optical axis AX in the ring centered on the optical axis AX. is there.

  The second state in which the movable member 310 is rotated to the position where it can move most clockwise is when the diaphragm driving member 203 of the interchangeable lens 200 is located at a position corresponding to the maximum aperture ratio (open diaphragm state). The state of the movable member 310 illustrated in FIG. 5 indicates the second state. The position of the movable member 310 in the second state is referred to as the maximum opening position. The movable member 310 can rotate an angle (θ1 + θ2) [°] counterclockwise in the circumferential direction around the optical axis AX from the maximum opening position.

  In the second terminal portion 330 of the present embodiment, the movable member 310 viewed from the optical axis direction (Y-axis direction) is the second terminal when the movable member 310 is closest to the second terminal portion 330 (second state). The terminal 330 is set so as not to overlap with the terminal. In other words, the second terminal portion 330 is arranged in the second range A2 excluding the first range A1 in which the movable member 310 can rotate in the circumferential direction around the optical axis AX. The pin 363 is disposed in the second range A2 excluding the first range A1 in which the movable member 310 can rotate in the circumferential direction around the optical axis AX.

  FIG. 6 is a perspective view showing the movable member 310 and the driving device 320 of the present embodiment. FIG. 7 is a plan view showing the movable member 310 and the driving device 320 of the present embodiment. FIG. 8 is a plan view showing the movable member 310, the driving device 320, and the presser plate 393 of the present embodiment.

  As shown in FIG. 6, the movable member 310 of the present embodiment includes a main body portion 371, a first contact portion 372, a first gear portion 373, and a flange portion 374. The movable member 310 rotates by the force (transmitted torque) received by the first gear unit 373 (input unit) from the driving device 320. The movable member 310 according to the present embodiment drives the diaphragm by causing the first contact portion 372 (output unit) to act (transmit) to the diaphragm driving member 203 of the interchangeable lens 200 by the rotation of the movable member 310. The member 203 is displaced.

  In the present embodiment, the outer shape of the main body 371 viewed from the optical axis direction (Y-axis direction) is substantially the same as the outer shape of the movable member 310 viewed from the optical axis direction. The main body 371 has substantially the same shape as a portion that occupies a predetermined angular range α [°] in the circumferential direction around the optical axis AX in the ring around the optical axis AX.

  The main body 371 of the present embodiment connects the first surface 375 facing the + Y direction in the optical axis direction, the second surface 376 facing the −Y direction, and the outer edge of the first surface 375 and the outer edge of the second surface 376. A third surface 377A and a fourth surface 377B are provided. The movable member 310 of the present embodiment includes a first member 378 including a first surface 375 and a second member 379 including a second surface 376. In the present embodiment, the first member 378 and the second member 379 are each formed by molding a resin material or the like. The main body 371 is not formed of the first member 378 and the second member 379, but may be integrally formed of a resin material.

  The first contact portion 372 of the present embodiment is attached to the first member 378 of the main body 371 on the same side (+ Y side) as the second mount 362 with respect to the main body 371. The first contact portion 372 protrudes to the inside of the inner periphery of the second mount 362 when viewed from the + Y direction in the optical axis direction (as viewed in the −Y direction). The first contact portion 372 contacts the aperture driving member 203 of the interchangeable lens 200 when the interchangeable lens 200 is attached. The diaphragm driving member 203 of the interchangeable lens 200 is urged in a predetermined direction (counterclockwise direction when viewed from the + Y side), and the first contact portion 372 is applied by the urging force when the interchangeable lens 200 is worn. Pressed against. The first contact portion 372 displaces the diaphragm driving member 203 in the circumferential direction around the optical axis AX by rotating integrally with the main body 371 while being in contact with the diaphragm driving member 203.

  As shown in FIGS. 6 and 7, the first gear portion 373 of the present embodiment is disposed in the vicinity of the driving device 320. The first gear portion 373 of the present embodiment is arranged in an angular range of −180 ° or more and less than −90 ° with respect to a circumferential position (angular position) about the optical axis AX. The first gear portion 373 of the present embodiment is attached to the fourth surface 377B facing outward in the radial direction centered on the optical axis AX in the main body portion 371. The first gear portion 373 includes a plurality of gear teeth facing outward in the radial direction about the optical axis AX. The center of the pitch circle 380 of the first gear portion 373 substantially coincides with the optical axis AX of the interchangeable lens 200. The plurality of gear teeth of the first gear portion 373 are arranged in a range corresponding to a part of the pitch circle 380 in the circumferential direction.

  The flange portion 374 of the present embodiment is provided in substantially the same angular range as the first gear portion 373 in the circumferential direction centered on the optical axis AX. The flange portion 374 is attached to the first member 378 of the main body 371 on the same side (+ Y direction) as the second mount 362 with respect to the main body 371. The flange portion 374 of the present embodiment protrudes from the tooth portion of the first gear portion 373 toward the outside in the radial direction centering on the optical axis AX from the main body portion 371.

The drive device 320 of this embodiment includes a second gear part (power transmission part) 381, a second contact part 382, and an actuator 383.
The second gear unit 381 of this embodiment outputs the power input from the actuator 383 to the first gear unit 373. Second gear portion 381 includes a plurality of gears. The second gear portion 381 is configured such that the first gear 385 in which the gear teeth of the first gear 385 of the plurality of gears mesh with the gear teeth of the first gear portion 373 is the optical axis AX with respect to the first gear portion 373. It is arranged on the outer side in the radial direction with respect to the center. Instead of the second gear unit 381, a power transmission unit that transmits the power output from the actuator 383 to the first gear unit 373 using friction or the like may be provided.

  The 2nd contact part 382 of this embodiment is cyclic | annular. The shaft of the second contact portion 382 is connected so as to be coaxial with the rotation shaft of the first gear 385 of the second gear portion 381. The second contact portion 382 contacts the flange portion 374 of the first gear portion 373, and forms a gap between the first gear portion 373 and the first gear 385 of the second gear portion 381. That is, the dimensions and positions of the second contact portion 382 and the flange portion 374 in the radial direction centered on the optical axis AX are such that the tooth tip of the first gear portion 373 does not reach the tooth base of the first gear 385. The first gear portion 373 and the first gear 385 of the second gear portion 381 are set to contact each other.

  The actuator 383 of this embodiment includes an electric motor (stepping motor). The actuator 383 is connected to the second gear portion 381. The actuator 383 supplies torque to the second gear portion 381 and rotates the first gear 385 of the second gear portion 381.

  Here, the interchangeable lens 200 has positional deviation (variation) within the tolerance range of the diaphragm driving member 203 in each individual as unique data. The positional shift is a relative positional shift with respect to a hole portion into which, for example, the pin 363 of the adapter 300 is inserted in the open aperture state of the interchangeable lens 200, and affects the aperture control of the interchangeable lens 200. The positional information of the aperture driving member 203 including the positional deviation is recorded in the lens control unit 204 at the time of shipping inspection of the interchangeable lens 200, for example. When the interchangeable lens 200 is attached to the adapter 300, the lens control unit 204 outputs the position information to the adapter control unit 350 via the first terminal unit 205 and the second terminal unit 330.

  As shown in FIG. 7, the adapter 300 of the present embodiment includes a sensor 386 that detects position information regarding the position of the movable member 310. The sensor 386 optically detects information related to the position of the movable member 310. The sensor 386 detects whether or not the movable member 310 is in a position rotated most clockwise (a position corresponding to the open aperture state of the interchangeable lens 200) in the circumferential direction around the optical axis AX. The sensor 386 outputs the detected position information to the adapter control unit 350. The first member 378 of the movable member 310 is provided with a light shielding portion 430 that is a detection piece of the sensor 386.

  The adapter control unit 350 controls the rotation state of the first gear 385 of the second gear unit 381 by controlling the actuator 383 based on the position information of the aperture driving member 203 output from the lens control unit 204. The adapter control unit 350 controls the rotational position of the movable member 310 by controlling the rotational state of the first gear 385, and as a result, controls the displacement of the aperture driving member 203. Note that the rotational position of the movable member 310 can be controlled based on the position information output from the sensor 386.

  As shown in FIGS. 6 and 7, the adapter 300 according to this embodiment includes a support roller 387 that supports the movable member 310 so that the movable member 310 can smoothly rotate in the circumferential direction around the optical axis AX. Have In the present embodiment, the support roller 387 includes a first support roller 387A, a second support roller 387B, and a third support roller 387C.

The first support roller 387A is disposed on the inner side with respect to the movable member 310 in the radial direction centered on the optical axis AX. The first support roller 387A is arranged at a position closer to the first contact portion 372 than the second gear portion 381 with respect to the rotational position in the circumferential direction around the optical axis AX.
The third support roller 387C is disposed on the outer side with respect to the movable member 310 in the radial direction centered on the optical axis AX. The third support roller 387C is disposed so as to sandwich the movable member 310 with the first support roller 387A.
The second support roller 387B is disposed on the inner side with respect to the movable member 310 in the radial direction centered on the optical axis AX. The second support roller 387B is disposed at a position closer to the first gear portion 373 than the first support roller 387A. The second support roller 387B is disposed so as to sandwich the first gear portion 373 of the movable member 310 between the second gear portion 381 and the second support roller 387B.

  The adapter 300 according to this embodiment includes a holding member 392 shown in FIG. 7 and a presser plate 393 shown in FIG. The holding member 392 is fixed to the first housing member 360. The holding member 392 faces the presser plate 393 in the optical axis direction (Y-axis direction). The first support roller 387A, the second support roller 387B, the third support roller 387C, and the movable member 310 are disposed between the holding member 392 and the pressing plate 393 in the optical axis direction. In the first support roller 387A, the second support roller 387B, and the third support roller 387C, one end of each rotation shaft is rotatably supported by the holding member 392, and the other end of each rotation shaft is the presser plate 393. Is rotatably supported.

  The movable member 310 has a gap between the holding member 392 and the presser plate 393 between the holding member 392 and the presser plate 393 so as not to prevent the rotation in the circumferential direction about the optical axis AX. It is. Movement of the movable member 310 in the optical axis direction (Y-axis direction) is restricted by being sandwiched between the holding member 392 and the pressing plate 393.

  By the way, when the movable member is provided on the entire circumference in the circumferential direction centering on the optical axis AX of the interchangeable lens 200, the adapter increases the power of the driving device required to rotate the movable member. However, there is a possibility of becoming large. Further, when the movable member is provided on the entire circumference in the circumferential direction centering on the optical axis AX of the interchangeable lens 200, the adapter may have a complicated mechanism for supporting the movable member, and the adapter may become large. There is.

  On the other hand, in the adapter 300 of the present embodiment, the movable member 310 is provided in a part of the circumferential direction centering on the optical axis AX of the interchangeable lens 200, so that the movable member 310 can be reduced in weight. Therefore, the adapter 300 can reduce the power required for the driving device 320 to rotate the movable member 310, and can reduce the device size. Further, since the adapter 300 is provided with a part of the movable member 310 in the circumferential direction centering on the optical axis AX of the interchangeable lens 200, the mechanism for supporting the movable member 310 can be simplified and the size of the apparatus can be reduced. Can be reduced in size.

Further, the movable member 310 may have a dimensional error in the optical axis direction to the extent that the movable member 310 interferes with the holding member or the pressing plate as it rotates. In addition, when the movable member 310 is annular, the adapter 300 may be prevented from rotating by the distortion of the shape of the member due to manufacturing error or the like.
On the other hand, in the adapter 300 of this embodiment, since the movable member 310 is provided in a part of the circumferential direction of the optical axis AX of the interchangeable lens 200, the movable member 310 is rotated due to a manufacturing error of the movable member 310 or the like. Can be prevented.

Here, the drive system of the movable member 310 (having the drive device 320 and the first gear portion 373 of the movable member 310) will be described with reference to FIG.
The actuator 383 is composed of a stepping motor, and is arranged so that the axis of the output shaft 400 of the actuator 383 is substantially parallel to the optical axis AX of the interchangeable lens 200. A drive gear 401 fixed to the end of the output shaft 400 of the actuator 383 is engaged with a first reduction gear 403 fixed to one end of a rotating shaft 402 whose axis is arranged substantially parallel to the optical axis AX.

A second reduction gear 404 is fixed to the other end of the rotation shaft 402, and a third reduction gear 404 is fixed to one end of a rotation shaft 406 having an axial center disposed substantially parallel to the optical axis AX. The reduction gear 405 is engaged.
A fourth reduction gear 407 is fixed to the other end of the rotation shaft 406. The fourth reduction gear 407 includes a fifth reduction gear fixed to one end of a rotation shaft 414 whose axis is disposed substantially parallel to the optical axis AX. The reduction gear 415 is engaged.

A sixth reduction gear 416 is fixed to the other end of the rotation shaft 414. The sixth reduction gear 416 has a seventh reduction gear fixed to one end of a rotation shaft 417 whose axis is arranged substantially parallel to the optical axis AX. The reduction gear 418 is engaged.
The first gear 385 described above is fixed to the other end of the rotating shaft 417, and the first gear portion 373 of the movable member 310 is engaged with the first gear 385.

  In the present embodiment, the drive gear 401, the first reduction gear 403, the second reduction gear 404, the third reduction gear 405, the fourth reduction gear 407, the fifth reduction gear 415, the sixth reduction gear 416, and the seventh reduction gear 418. The movable member 310 and the actuator 383 are connected by a reduction gear train including the first gear 385 and the first gear portion 373, and the movable member 310 and the actuator 383 are directly connected via the reduction gear train. The sensor 386 detects whether or not the drive system is in the initial state (whether or not the movable member 310 is in the position rotated most clockwise).

  As shown in FIG. 9, the aperture driving member 203 of the interchangeable lens 200 is movable in a range where the aperture ratio of the aperture unit 202 changes from the maximum aperture ratio (open state) to the minimum aperture ratio. The aperture driving member 203 is urged in a direction (counterclockwise direction when viewed from the + Y direction) to reduce the aperture ratio of the aperture unit 202 by a second urging force from an urging member (not shown).

  The first contact portion 372 of the movable member 310 is in contact with the aperture driving member 203 of the interchangeable lens 200 from below (clockwise as viewed from the + Y direction). When the aperture driving member 203 is moved so that the aperture ratio of the aperture of the interchangeable lens 200 is increased, the first contact portion 372 moves against the second urging force acting on the aperture driving member 203. When the aperture driving member 203 is located at a position corresponding to the maximum aperture ratio, the movable member 310 cannot move any further. The position of the movable member 310 at this time (second state of the movable member 310) is the maximum opening position described above. In FIG. 9, the solid line indicates a state where the movable member 310 is positioned at the maximum opening position, and the two-dot chain line indicates a state where the movable member 310 is positioned at the minimum opening position.

  Here, it is assumed that the movable member 310 is moved in the direction of increasing the aperture ratio by driving the actuator 383. Since the actuator 383 is controlled by the adapter control unit 350, the actuator 383 continues to be driven until a stop command is issued from the adapter control unit 350. When the movable member 310 reaches the maximum opening position, the movable member 310 cannot move beyond the maximum opening position as described above.

Normally, the position corresponding to the maximum aperture ratio of the aperture driving member 203 of the interchangeable lens 200 (open aperture position) is the same, but even in this case, as shown in FIG. 10, the reference position of the aperture driving member 203 is as described above. Since there is a position variation with respect to the (absolute open position), the maximum opening position of the movable member 310 also varies. Further, the movable member 310 itself has a position variation with respect to the reference position (absolute open position). The absolute open position indicates an ideal open position in design.
However, the position information of the diaphragm drive member 203 of the interchangeable lens 200 is output to the adapter control unit 350 in advance, and the position information of the movable member 310 is also stored in the adapter control unit 350, and the position information is taken into account to move the position information. By controlling the drive of the member 310, the overload of the actuator 383 due to an overstroke or the like of the movable member 310 is suppressed, and the movable member 310 is accurately driven based on the true open throttle position of the diaphragm drive member 203. Can do.

In other words, the first contact portion 372 of the movable member 310 has an error εA with respect to the absolute open position (occurred due to an error in the position where the sensor for detecting the initial position is incorporated, a dimensional error of the movable member 310 itself, etc.). It is stored in the adapter controller 350. In addition, the aperture driving member 203 also has an error εL with respect to the absolute opening position (caused by an installation position error, a dimensional error, etc.), and this error εL is stored in the lens control unit 204.
When the interchangeable lens 200 is attached, the adapter control unit 350 receives the error εL, and “the aperture position of the interchangeable lens 200” = “the drive amount (design value) from the drive reference position (maximum aperture position) of the movable member 310”. Aperture control is performed as + “error εA” + “error εL”.

  The adapter control unit 350 uses the maximum opening position of the first contact unit 372 as a drive reference position for the aperture control of the interchangeable lens 200, and moves the first contact unit 372 from there to a position corresponding to the aperture command value F. . The adapter control unit 350 rotates the movable member 310 by pulse-controlling the actuator 383 (stepping motor) in order to move the first contact unit 372 to a position corresponding to the aperture command value F.

  For example, if the drive amount of 1 Av is 12 pulses, when the aperture is reduced by 2 Av from the full aperture, the actuator 383 is driven in the narrowing direction by (m + 24) pulses, and the throttled state is maintained by the detent torque of the stepping motor that is the actuator 383. To do. Note that m is a correction term for correcting the driving amount from the wide open aperture, and corrects the interlocking error of the gear train of the driving device 320.

Further, in order to narrow down 3 Av from this state, the actuator 383 is driven by 36 pulses in the narrowing direction.
Subsequently, when opening 1 Av, the actuator 383 is driven by (12 + n) pulses toward the open side of the diaphragm. The n is a correction term for correcting a difference in driving direction, and corrects an interlocking error in the driving device 320.

Next, the operation of the movable member 310 when the adapter 300 is turned on and off will be described.
When the adapter 300 is turned off, the first contact portion 372 is located at a retracted position separated from the aperture driving member 203.
When a power switch (not shown) of the camera body 100 is turned on, the power of the adapter 300 is turned on.

  The adapter control unit 350 of the adapter 300 to which power is supplied acquires lens data (including position information of the aperture driving member 203) from the interchangeable lens 200, and executes an initialization process for the first contact unit 372. This initialization processing takes into account the positional deviation of the diaphragm driving member 203 due to individual differences of the interchangeable lens 200 and the positional deviation of the movable member 310 itself with respect to the designed full aperture position (absolute open position) of the diaphragm driving member 203. This is a process for finding the actual open aperture position and setting the maximum aperture position of the first contact portion 372 corresponding to the open aperture position as the reference position for aperture control.

  Thereafter, as described above, the adapter control unit 350 controls the actuator 383 according to the aperture command value F with the maximum opening position of the first contact portion 372 as a reference position, and moves the first contact portion 372 in the narrowing direction. The aperture control to be moved is executed.

  On the other hand, when a power switch (not shown) of the camera body 100 is turned off, the adapter controller 350 drives the actuator 383 to move the actuator 383 to move the first contact portion 372 (movable member 310) to the retracted position. Control. Thereafter, the power supply of the adapter 300 is turned off.

  As described above, the adapter 300 according to the present embodiment sets the true maximum opening position of the movable member 310 using the position information of the diaphragm drive member 203 and the position information of the movable member 310 itself for each individual that the interchangeable lens 200 has. By doing so, the aperture control of the interchangeable lens 200 can be accurately performed. Further, it is only necessary to connect the lens control unit 204 storing the position information of the aperture driving member 203 and the adapter control unit 350 so that they can communicate with each other. Costs can be reduced by eliminating the need.

The present invention is not limited to the above-described embodiment as long as the characteristics of the present invention are not impaired, and other forms can be adopted within the scope of the technical idea of the present invention.
For example, even when using interchangeable lenses having different aperture positions in the design of the aperture drive member, the maximum aperture position of the movable member can be determined by using position information including a difference with respect to the standard aperture position of the aperture drive member. It is possible to set.
It is also possible to set the maximum opening position of the movable member more accurately by detecting the mounting error of the interchangeable lens with respect to the adapter and adding this to the position information.

DESCRIPTION OF SYMBOLS 1 Camera system 300 Adapter 203 Diaphragm drive member 200 Interchangeable lens 100 Camera body 310 Movable member 350 Adapter control part 204 Lens control part 205 1st terminal part (lens side terminal part)
330 Second terminal (adapter side terminal)

Claims (1)

A first mount part to which the camera body can be attached and detached;
A second mount part on which an interchangeable lens having an aperture can be attached and detached;
A moving member that moves to change the aperture diameter of the stop to drive the stop driving member of the interchangeable lens;
Deviation between the position of the moving member that opens the aperture diameter of the aperture and the position of the moving member that controls the aperture to open, the position of the aperture drive member that opens the aperture diameter of the aperture, and the aperture A control unit that controls the position of the diaphragm by correcting the amount of movement of the moving member according to the deviation from the position of the diaphragm driving member that is controlled to be opened.
With an adapter.

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