JP5344655B2 - Conversion adapter device and interchangeable lens system - Google Patents

Description

  The present invention relates to a conversion adapter device and an interchangeable lens system.

  In order to meet the demand for downsizing and weight reduction of digital single-lens reflex cameras, a new type of single-lens reflex camera different from conventional digital single-lens reflex cameras has been proposed in recent years. The new type single-lens reflex camera does not have a quick return mirror for guiding the photographing light flux to the viewfinder, and has a shorter flange back than the conventional camera. A new type of interchangeable lens with a short flange back has been proposed that is compatible with the new type of camera described above. However, the above-mentioned new type of interchangeable lens has few varieties, and it is difficult to cope with various photographing conditions. Therefore, there are cases where it is desired to use a conventional type interchangeable lens that has already been introduced to the market and has a wide variety of products and quantities for a new type of camera. For this purpose, a conversion adapter for connecting a conventional type interchangeable lens and a new type camera body is required. The functions required for this conversion adapter are mainly to match different mount shapes between the lens and camera body, align different flange backs between the lens and camera body, and hinder the communication system between the lens and camera body. Is not to.

In order to enable communication between the camera body and the interchangeable lens, which is an essential function of the conversion adapter, the conversion adapter is provided with a communication contact. A conversion adapter has been proposed in which a communication contact connected to the camera body side and a communication contact connected to the interchangeable lens side of the conversion adapter are provided at the same position around the camera optical axis. In this conversion adapter, for example, two corresponding communication contacts, a communication contact connected to the camera body (camera body communication contact) and a communication contact (lens communication contact) connected to the interchangeable lens, are electrically connected. A conducting member is provided.
Patent Document 1 below discloses a conversion adapter device in an interchangeable lens system that controls a control signal output from a camera body by communicating it with a first signal unit in a first signal form. Yes. This conversion adapter device enables connection of a second lens unit controlled by control information of a second signal form different from the first signal form to the camera body.

JP-A-4-273671

However, when the flange back of the camera body of the new type camera described above is close to the flange back of the conventional interchangeable lens, it is necessary to reduce the thickness of the conversion adapter. When the thickness of the conversion adapter is thin, it is difficult to provide the camera body side communication contact and the lens side communication contact of the conversion adapter at the same position around the optical axis of the camera because the space is too close. In addition, when the positions of the camera body side communication contact and the lens side communication contact around the camera optical axis are close to each other, it is difficult to lay out a conductive member that conducts these communication contacts. Further, the assembly workability of the camera body side communication contact, the lens side communication contact, and the conducting member portion is deteriorated.
The present invention is a conversion adapter device that enables mounting of a camera body and an interchangeable lens with different flange backs, and includes a layout of communication contacts on the camera side and a communication contact on the lens side, and a layout of a conductive member that conducts the communication contacts. An object of the present invention is to provide an improved conversion adapter device.

  The conversion adapter apparatus of one Embodiment of this invention is a conversion adapter apparatus which connects a camera main body and an interchangeable lens. The conversion adapter device is provided in a camera body side mounting portion provided to be attachable to the camera body, a lens side mounting portion provided to be attachable to the interchangeable lens, and the camera body side mounting portion, A first communication contact group in contact with the communication contact group of the camera body, a second communication contact group provided in the lens side attachment portion and in contact with the communication contact group of the interchangeable lens, and the first communication contact group; A conductive member that electrically connects the second communication contact group. Further, the conversion adapter device includes a second communication contact group attached to the lens body side with a distance between a first communication contact group provided in the camera body side attachment portion and an optical axis of the interchangeable lens; The first communication contact group and the second communication contact group are set at a predetermined angle around the optical axis when viewed from the camera side in a state where the first communication contact group and the second communication contact group are mounted on the camera body. Prepare for a remote location.

  According to the conversion adapter device of the present invention, it is possible to mount the camera body and the interchangeable lens having different flange backs, and to improve the layout of the communication contact on the camera side and the communication contact on the lens side of the conversion adapter device. . Moreover, according to the conversion adapter apparatus of this invention, the layout of the conduction | electrical_connection member which conducts the communication contacts with which a conversion adapter apparatus is equipped, and the assembly workability | operativity of a communication contact and a conduction | electrical_connection member can be improved.

It is a figure which shows the example of schematic structure of the whole camera provided with the conversion adapter apparatus. It is a figure which shows the structure of a conversion adapter. It is a figure which shows the example of schematic structure of the whole camera provided with the conversion adapter apparatus. It is a figure which shows the structure of a conversion adapter.

  FIG. 1 is a diagram illustrating a schematic configuration example of an entire camera including the conversion adapter device according to the first embodiment of the present invention. The camera shown in FIG. 1 is, for example, a digital camera or a video camera that controls a plurality of imaging optical systems to execute planar image shooting or stereoscopic image shooting. The camera shown in FIG. 1 includes a camera body 10, an interchangeable lens 20, and a conversion adapter 30 that connects the camera body 10 and the interchangeable lens 20. The camera body 10 is a new type of camera having a shorter flange back than a conventional type camera. The interchangeable lens 20 is attached to the camera body 10 via the conversion adapter 30. The camera body 10 and the interchangeable lens 20 have different mount standards and cannot be mounted directly. Further, the camera body 10 and the interchangeable lens 20 have different flange backs. The flange back of the camera body 10 is the distance from the reference plane to which the interchangeable lens 20 of the camera body 10 is attached to the imaging surface of the imaging device. The flange back of the interchangeable lens 20 is the distance from the reference plane to which the camera body 10 of the interchangeable lens 20 is attached to the focal position.

The camera body 10 includes a camera body side mount unit 11, a camera side communication contact group 12, a central processing unit (MPU: Micro Processing Unit) 100, and an image sensor 400. The camera body 10 is not provided with a quick return mirror or a dedicated focus detection unit. The MPU 100 is a control unit that controls the operation of the camera, and executes various processes and instructions for various elements of the camera system. The imaging device 400 is an imaging device that converts a subject image formed by a photographing optical system into an electrical signal. In this embodiment, a CMOS (Complementary Metal Oxide Semiconductor) sensor is used as the image sensor 400. As the imaging device 400, a CCD (Charge Coupled Device) type and a CID (Charge-injection)
Various types of imaging devices such as a (Device) type may be used. The electric signal of the image sensor 400 is subjected to analog / digital (A / D) conversion and then subjected to various known signal processing. The camera body side mount unit 11 is provided at the end of the camera body 10 on the subject side (interchangeable lens side). A mount surface 11 a is provided on the subject-side end surface of the camera body side mount unit 11. A camera side communication contact group 12 is provided on the camera body side mount unit 11.

  The interchangeable lens 20 includes a lens side mount unit 21, a lens side communication contact group 22, a photographing lens 200, a lens control circuit 201, an AF drive circuit 202, an aperture drive circuit 203, and an aperture 204. The taking lens 200 is held so as to be movable in the optical axis direction by a lens moving means such as a lens frame (not shown) or an actuator according to the distance to the subject to be focused. In FIG. 1, one photographing lens 200 is illustrated for convenience, but the photographing lens 200 actually has a large number of lens groups. The lens control circuit 201 communicates with the MPU 100 and drives the photographing lens 200 and the diaphragm 204 in the interchangeable lens 20 via the AF driving circuit 202 and the diaphragm driving circuit 203. The AF drive circuit 202 is configured by, for example, a stepping motor, and changes the focus lens position in the photographing lens 200 under the control of the lens control circuit 201 so as to adjust the focus of the photographing light flux on the image sensor. The aperture driving circuit 203 is configured by, for example, an auto iris or the like, and changes the aperture 204 under the control of the lens control circuit 201 to obtain an optical aperture value. The lens side mount portion 21 is provided at the end of the interchangeable lens 20 on the photographer side (camera body side). A mount surface 21 a is provided on the end surface on the photographer side of the lens side mount portion 21. The lens side communication contact group 22 is provided on the lens side mount portion 21.

  The conversion adapter 30 is the conversion adapter device of the present embodiment, and connects the camera body 10 and the interchangeable lens 20. The conversion adapter 30 includes a camera body side attachment portion 31, a camera body side communication contact group 32, a lens side attachment portion 33, and a lens side communication contact group 34. In the present embodiment, the conversion adapter 30 has a substantially annular shape, but the shape of the conversion adapter 30 is not limited to the annular shape. The camera main body side attaching portion 31 is provided at one end of the conversion adapter 30 and corresponds to the standard of the mount portion of the camera main body 10. That is, the camera body side attachment portion 31 is provided so as to be attachable to the camera body 10. The camera body-side mounting portion 31 has a camera body-side mounting surface 31a on the end surface on the camera body side. The camera body 10 can be mounted in a form in which the mount surface 11a of the camera body 10 and the camera body-side mounting surface 31a are in contact with each other. The camera body side attachment portion 31 is provided with a camera body side communication contact group 32. The camera body side communication contact group 32 is a first communication contact group, and when the camera body 10 is mounted on the camera body side mounting part 31, the camera side communication contact group provided on the camera body side mount part 11 is provided. Twelve.

  The lens side mounting portion 33 is provided at the end facing the camera body side mounting portion 31 and corresponds to the standard of the mount portion of the interchangeable lens 20. That is, the lens side attaching portion 33 is provided so as to be attachable to the interchangeable lens 20. The lens side attachment portion 33 has a lens side attachment surface 33a on the end surface on the interchangeable lens side. The interchangeable lens 20 can be mounted in a form in which the mount surface 21a of the interchangeable lens 20 and the lens side mounting surface 33a are in contact with each other. The lens side attachment portion 33 is provided with a lens side communication contact group 34. The lens side communication contact group 34 is a second communication contact group, and contacts the lens side communication contact group 22 provided on the lens side mount portion 21 when the interchangeable lens 20 is mounted on the lens side mounting portion 33. .

  In the present embodiment, the camera body side communication contact group 32 and the lens side communication contact group 34 of the conversion adapter 30 are provided at positions facing each other across the optical axis (camera optical axis). The camera body side communication contact group 32 and the lens side communication contact group 34 are electrically connected by a conductive member 301 such as a flexible printed circuit board or a lead wire. As a result, the MPU 100 performs various operations via the lens control circuit 201 in the interchangeable lens 20, the camera side communication contact group 12, the camera body side communication contact group 32, the conducting member 301, and the lens side communication contact groups 34 and 22. Communication can be performed. For example, the MPU 100 can perform lens attachment / detachment communication, lens data communication, lens drive communication, and the like to the lens control circuit 201.

  Here, the thickness of the conversion adapter 30 shown in FIG. 1 (the distance in the optical axis direction from the camera body side mounting surface 31a to the lens side mounting surface 33a) is C. As shown in FIG. 1, when the flange back of the camera body 10 is A and the flange back of the interchangeable lens 20 is B, the relationship C = B−A is established. That is, the flange back of the camera body 10 is shorter than the flange back of the interchangeable lens 20, and the thickness of the conversion adapter 30 corresponds to the difference between the flange back of the camera body 10 and the flange back of the interchangeable lens 20. In this embodiment, by using the conversion adapter 30 having a thickness C (= B−A) between the flange back A of the camera body 10 and the flange back B of the interchangeable lens 20, both flange backs are matched ( Can be matched).

  The interchangeable lens system of the present embodiment can be realized as an interchangeable lens system including the conversion adapter device of the present embodiment described above with reference to FIG. According to the conversion adapter device or the interchangeable lens system of the present embodiment, the user can mount the interchangeable lens 20 on the camera body 10 and shoot normally without being affected by the difference in the mount standard or the flange back standard. Is possible.

  FIG. 2 is a diagram showing a configuration of the conversion adapter shown in FIG. FIG. 2A is a view of the conversion adapter 30 as viewed from the interchangeable lens side, and mainly shows the lens side mounting portion 33 of the conversion adapter 30. FIG. 2B is a view of the conversion adapter 30 as viewed from the side. FIG. 2C is a view of the conversion adapter 30 as viewed from the camera body side, and mainly shows the camera body side attachment portion 31 of the conversion adapter 30. As shown in FIG. 2C, the camera body side attachment portion 31 is provided with three claw portions 35 that protrude outward in the radial direction. The conversion adapter 30 is rotated to the right when viewed from the interchangeable lens side, and the claw portion 35 is hooked on the claw portion of the mount portion of the camera body (not shown), so that the camera adapter 10 can be attached. On the other hand, as shown in FIG. 2A, the lens-side attachment portion 33 is provided with three claw portions 36 that protrude radially inward. When the interchangeable lens 20 is rotated to the right when viewed from the interchangeable lens side and the claw portion of the mount portion of the interchangeable lens (not shown) is hooked on the claw portion 36, the interchangeable lens 20 can be attached.

  The size of the camera body side attachment portion 31 is smaller than the size of the lens side attachment portion 33. This is because the camera body side mount unit 11 and the lens side mount unit 21 have different mount standards, and the camera body side mount unit 11 is smaller. In the camera main body side attaching portion 31, a camera main body side communication contact group 32 is arranged on the upper side with respect to the optical axis (upward with respect to the optical axis in the camera normal position state). The camera body side communication contact group 32 includes communication contacts 320 to 329 having substantially rectangular planar contacts. The communication contacts 320 to 329 correspond to communication contacts included in the camera side communication contact group 12 of the camera body 10.

  The role of the communication contacts included in the camera body side communication contact group 32 is shown below. The communication contact 320 is a lens driving power contact. The communication contact 321 is a lens driving GND contact. Communication contacts 322 to 326 are signal system contacts. Specifically, the communication contact 322 is a lens control circuit power supply contact, and the communication contact 323 is a signal contact from the camera to the lens. The communication contact 324 is a signal contact from the lens to the camera, the communication contact 325 is a contact for synchronizing the communication clock between the camera and the lens, and the communication contact 326 is a GND contact for the lens control circuit. The communication contacts 327 to 329 are communication contacts corresponding to a new type of camera mounting standard. The communication contacts 327 to 329 are second drive power supply system contacts different from the communication contacts 320 and 321 described above, and are used when driving different from normal lens driving. For example, it is used when an operation of slowly moving the focus lens in the photographing lens 200 to slow down the focusing speed or an operation of moving the focus lens at high speed to increase the focusing speed is performed. The communication contact 327 is a second power supply contact for driving the lens, and the communication contact 328 is a contact for confirming whether or not the lens capable of the special operation described above is correctly attached. The communication contact 329 is a second lens driving GND contact.

  On the other hand, as shown in FIGS. 2A and 2B, the lens side communication contact group 34 is positioned on the lens side attachment portion 33 so as to face the camera body side communication contact group 32 with the optical axis in between (camera correct). It is provided on the lower side with respect to the optical axis in the position state. That is, the position of the camera body side communication contact group 32 around the camera optical axis is different from the position of the lens side communication contact group 34 around the camera optical axis. Since the communication contact group 22 of the interchangeable lens 20 is disposed below the optical axis in the camera normal position state, the user converts the interchangeable lens 20 in a manner similar to that for mounting the interchangeable lens on a normal camera. The adapter 30 can be attached.

  The lens side communication contact group 34 is substantially cylindrical and includes communication contacts 340 to 347 having circular contact surfaces. Each of the communication contacts 340 to 347 is movable in the optical axis direction and is supported inside by an elastic member such as a spring. Communication contacts 340 to 347 correspond to communication contacts included in the communication contact group 22 of the lens. When an external force is applied from the lens-side attachment portion 33 toward the camera body-side attachment portion 31, the communication contacts 340 to 347 move according to the applied external force, and return to the original position when no load is applied. Therefore, when the interchangeable lens 20 is attached, the communication contacts 340 to 347 can contact the corresponding communication contacts included in the lens side communication contact group 22 of the interchangeable lens 20 with a certain reaction force. . As a result, instantaneous disconnection between the contacts can be prevented and stable communication can be performed. If the communication contacts 340 to 347 are provided so as to contact the communication contact of the interchangeable lens 20 with a predetermined reaction force in a state where the interchangeable lens 20 is attached to the conversion adapter 30, the communication contacts 340 to 347 are provided. The moving direction may be the radial direction. Further, the communication contacts 340 to 347 may be non-movable.

  The role of the communication contacts 340 to 347 is shown below. Communication contacts 340 to 342 are drive power supply system contacts. Specifically, the communication contact 340 is a lens driving power contact, and the communication contact 341 is a contact for confirming whether or not a lens is mounted. The communication contact 342 is a lens driving GND contact. Communication contacts 343 to 347 are signal system contacts. Specifically, the communication contact 343 is a power supply contact for the lens control circuit, the communication contact 344 is a signal contact from the camera to the lens, and the communication contact 345 is a signal contact from the lens to the camera. The communication contact 346 is a contact for synchronizing the communication clock between the camera and the lens, and the communication contact 347 is a lens control circuit GND contact.

  What is a communication contact (first communication contact) included in the camera body side communication contact group 32 and a communication contact (second communication contact) corresponding to the first communication contact included in the lens side communication contact group 34? Are electrically connected by a conducting member 301. For example, the communication contact 320 is connected to a communication contact 340 that is a corresponding communication contact, and the communication contact 321 is connected to communication contacts 341 and 342 that are corresponding communication contacts. The communication contact 322 is connected to the communication contact 343 that is a corresponding communication contact, and the communication contact 323 is connected to the communication contact 344 that is a corresponding communication contact. Further, the communication contact 324 is connected to a communication contact 345 that is a corresponding communication contact, and the communication contact 325 is connected to a communication contact 346 that is a corresponding communication contact. The communication contact 326 is connected to a communication contact 347 that is a corresponding communication contact. Note that the communication contacts corresponding to the communication contacts 327 to 329 are not provided in the lens side mounting portion 33.

  Here, it is assumed that the camera body side communication contact group 32 and the lens side communication contact group 34 are arranged so that their positions around the camera optical axis are the same (for example, both contact groups are in the camera normal position state). It is assumed that it is placed in the lower position. In this case, the camera body side communication contact group 32 and the lens side communication contact group 34 are attributed to the fact that the thickness of the conversion adapter 30 is thin and the layout volume in the optical axis direction of the lens side communication contact group 34 is large. Will be close. As a result, the layout of the camera body side communication contact group 32 and the lens side communication contact group 34 becomes difficult. Even if the camera body side communication contact group 32 and the lens side communication contact group 34 can be laid out, the conductive member 301 that connects the camera body side communication contact group 32 and the lens side communication contact group 34 is provided. It will be shorter. As a result, the arrangement of the communication contact group, the arrangement of the conducting member 301, and the assembly workability of the communication contact group and the conducting member 301 are deteriorated.

  On the other hand, in the conversion adapter device of the present embodiment, the position of the camera body side communication contact group 32 around the camera optical axis is different from the position of the lens side communication contact group 34 around the camera optical axis. Yes. Specifically, in the conversion adapter device of the present embodiment, the camera body side communication contact group 32 and the lens side communication contact group 34 are arranged so as to face each other across the optical axis. Therefore, according to the conversion adapter device of the present embodiment, a predetermined distance can be provided between the camera body side communication contact group 32 and the lens side communication contact group 34. As a result, the layout of the camera body side communication contact group 32 and the lens side communication contact group 34 can be improved. Further, the layout of the conductive member 301 that conducts the camera body side communication contact group 32 and the lens side communication contact group 34 and the assembly workability of the camera body side communication contact group 32, the lens side communication contact group 34 and the conduction member 301 are improved. Can be improved.

  In this embodiment, the communication contacts 327 to 329 are second drive power supply system contacts, but the communication contacts 327 to 329 communicate more information between the camera body 10 and the interchangeable lens 20 than in the past. It may be an additional signal system contact for enabling. Further, the number of the second drive power supply system contacts or the additional signal system contacts may be larger or smaller than the number of communication contacts 327 to 329 shown in FIG. Further, the communication contacts 327 to 329 may be arranged, for example, between the power system contact and the signal system contact. Further, the camera body side communication contact group 32 may be configured not to include the communication contacts 327 to 329.

  In the present embodiment, the camera body side communication contact group 32 of the conversion adapter 30 is arranged above the optical axis in the camera normal position, and the lens side communication contact group 34 is arranged below the optical axis in the camera normal position. Therefore, the camera body has the following advantages. That is, in a new type of camera, an electronic viewfinder, a display member, an operation member and the like are concentrated on the upper side of the mount, and an electric mounting system is also concentrated on the upper side of the mount. Accordingly, the layout efficiency of the electrical mounting system is improved by the camera body side communication contact group 32 being arranged above the optical axis in the camera normal position state.

  FIG. 3 is a diagram illustrating a schematic configuration example of the entire camera including the conversion adapter device according to the second embodiment of the present invention. Among the components included in the camera illustrated in FIG. 3, components having the same reference numerals as those included in the camera illustrated in FIG. 1 have the same functions as the components included in the camera illustrated in FIG. 1. The camera shown in FIG. 3 includes a camera body 10, an interchangeable lens 20, and a conversion adapter 40 that connects the camera body 10 and the interchangeable lens.

  The conversion adapter 40 is different from the conversion adapter 30 shown in FIG. 1 in that the camera body side communication contact group 42 of the camera body side mounting portion 41 is arranged on the right side with respect to the optical axis. The function is the same as the configuration and function of the conversion adapter 30. That is, the camera main body side attaching portion 41 included in the conversion adapter 40 has the same function as that of the camera main body side attaching portion 31 shown in FIG. Further, the camera body side communication contact group 42 has the same function as that of the camera body side communication contact group 32 shown in FIG. Moreover, the lens side attaching part 43 has a function similar to the function which the lens side attaching part 33 shown in FIG. 1 has. The lens side communication contact group 44 has the same function as the lens side communication contact group 34 shown in FIG. The camera body-side mounting portion 41 has a camera body-side mounting surface 41a on the end surface on the camera body side. The camera body side mounting surface 41a has the same function as the camera body side mounting surface 31a shown in FIG. The lens-side attachment portion 33 has a lens-side attachment surface 43a on the end surface on the interchangeable lens side. The lens side attachment surface 43a has the same function as the lens side attachment surface 33a shown in FIG. Further, the camera body side communication contact group 42 and the lens side communication contact group 44 are electrically connected via a conducting member 401 having the same function as the conducting member 301 shown in FIG. The interchangeable lens system of the present embodiment can be realized as an interchangeable lens system including the conversion adapter 40 shown in FIG.

  FIG. 4 is a diagram showing a configuration of the conversion adapter shown in FIG. FIG. 4A is a view of the conversion adapter 40 as viewed from the interchangeable lens side. FIG. 4B is a view of the conversion adapter 40 as viewed from the side. FIG. 4C is a view of the conversion adapter 40 as viewed from the camera body side. The functions of the communication contacts (communication contacts 420 to 429) included in the camera body side communication contact group 42 shown in FIG. 4C are the same as the communication contacts (communication contacts) included in the camera body side communication contact group 32 shown in FIG. 320 to 329). Further, the functions of the communication contacts (communication contacts 440 to 447) included in the lens side communication contact group 44 shown in FIG. 4A are the same as the communication contacts (communication contacts) included in the lens side communication contact group 34 shown in FIG. 340 to 347). 4A has the same function as the claw portion 36 shown in FIG. 2A, and the claw portion 45 shown in FIG. It has the same function as the claw portion 45 shown. The camera-side communication contact group 12 included in the camera body 10 is also in relation to the optical axis in the camera normal position so that the camera body-side communication contact group 42 contacts the camera body-side communication contact group 42 when the camera body 10 is attached to the interchangeable lens 40. Located on the right side.

  In the second embodiment of the present invention, as shown in FIG. 4C, the camera body side communication contact group 42 of the conversion adapter 40 is on the right side of the optical axis (viewed from the photographer side in the camera normal position state). The right side of the optical axis. Further, as shown in FIG. 4A, the lens side communication contact group 44 of the conversion adapter 40 is disposed on the lower side with respect to the optical axis (lower side with respect to the optical axis in the camera normal position state). . That is, the camera main body side communication contact group 42 and the lens side communication contact group 44 are positioned 90 degrees apart about the camera optical axis (in the example shown in FIG. 4, approximately 1 in the circumferential direction of the circle centered on the optical axis). / Position shifted by 4 rotations). Therefore, according to the conversion adapter 40, a predetermined distance can be provided between the camera body side communication contact group 42 and the lens side communication contact group 44. As a result, the layout of the camera body side communication contact group 42 and the lens side communication contact group 44 can be improved. Further, the layout of the conductive member 401 that conducts the camera body side communication contact group 42 and the lens side communication contact group 44, and the assembly workability of the camera body side communication contact group 42, the lens side communication contact group 44, and the conduction member 401 are improved. Can be improved.

  Further, when the camera body 10 is a camera body corresponding to a new type of camera in which a battery as a power source is disposed in a grip on the right side with respect to the optical axis, there are the following merits. That is, as in the second embodiment of the present invention, the camera-side communication contact group 12 of the camera body 10 is arranged on the right side with respect to the optical axis, so that the camera-side communication contact group 12 is positioned near the power source. As a result, the layout efficiency of the electrical mounting system is improved.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. A part of the above-described embodiments may be appropriately combined. For example, the position provided between the camera body side communication contact group and the lens side communication contact group included in the conversion adapter device of the present invention may be a position where a predetermined distance can be provided between them. . That is, the camera main body side communication contact group and the lens side communication contact group provided in the conversion adapter device may be provided at positions separated by an arbitrary angle around the camera optical axis.

  Further, in the present embodiment, an example in which the mount standard of the camera body and the mount standard of the interchangeable lens including the size of the mount is shown, but the size of both mounts may be the same. In that case, only the size of the camera body side attachment portion and the lens side attachment portion of the conversion adapter is the same, and the arrangement of the communication contact group does not depart from the gist of the present invention.

(Other examples)
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed. In this case, the program and the storage medium storing the program constitute the present invention.

10 Camera body 20 Interchangeable lens 30 Conversion adapter

Claims (8)

A conversion adapter device for connecting a camera body and an interchangeable lens,
A camera body side mounting portion provided so as to be attachable to the camera body;
A lens side mounting portion provided so as to be attachable to the interchangeable lens;
A first communication contact group that is provided in the camera body side mounting portion and is in contact with the communication contact group of the camera body;
A second communication contact group that is provided in the lens-side attachment portion and is in contact with the communication contact group of the interchangeable lens;
A conductive member that electrically connects the first communication contact group and the second communication contact group;
The diameter from the central axis of the adapter device to the first communication contact group provided on the camera body side mounting portion is greater than the diameter from the central axis to the second communication contact group attached to the lens body side. And the first communication contact group and the second communication contact group are provided at a position separated by a predetermined angle around the central axis when viewed from the camera side when mounted on the camera body. A conversion adapter device characterized by that. 2. The conversion adapter device according to claim 1, wherein the first communication contact group and the second communication contact group are provided at positions facing each other across the central axis. The conversion adapter device according to claim 2, wherein the first communication contact group is provided on the upper side with respect to the central axis in a camera normal position state. 2. The conversion adapter device according to claim 1, wherein the first communication contact group and the second communication contact group are provided at positions 90 degrees apart about the central axis. The conversion adapter device according to claim 4, wherein a communication contact group of the camera body that is in contact with the first communication contact group is provided at a position near a power source of the camera. The second communication contact group is provided to contact the communication contact of the interchangeable lens with a predetermined reaction force in a state where the interchangeable lens is mounted on the conversion adapter device. Item 6. The conversion adapter device according to any one of Items 1 to 5. 2. The flange back of the camera body is shorter than the flange back of the interchangeable lens, and the thickness of the conversion adapter device is a difference between the flange back of the camera body and the flange back of the interchangeable lens. The conversion adapter apparatus in any one of thru | or 6. An interchangeable lens system comprising a conversion adapter device for connecting a camera body and an interchangeable lens,
The conversion adapter device is
A camera body side mounting portion provided so as to be attachable to the camera body;
A lens side mounting portion provided so as to be attachable to the interchangeable lens;
A first communication contact group that is provided in the camera body side mounting portion and is in contact with the communication contact group of the camera body;
A second communication contact group that is provided in the lens-side attachment portion and is in contact with the communication contact group of the interchangeable lens;
A conductive member that electrically connects the first communication contact group and the second communication contact group;
The diameter from the central axis of the adapter device to the first communication contact group provided on the camera body side mounting portion is greater than the diameter from the central axis to the second communication contact group attached to the lens body side. And the first communication contact group and the second communication contact group are provided at a position separated by a predetermined angle around the central axis when viewed from the camera side when mounted on the camera body. An interchangeable lens system characterized by that.

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