JPH0561741U - Optical device mounting device - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a mounting device for an optical device in which the number of parts is reduced and the structure is simplified. An optical device in which mounting and dismounting means are respectively provided in the optical devices to be attached to and detached from each other, and a conduction pin member which is in contact with each other at the time of coupling and electrically connects the optical devices to each other is provided. In the mounting device described above, at least one main body of the both mounting portions is made of a synthetic resin material, and the mounting main body made of the synthetic resin material is provided with an insertion holding hole through which the conductive pin member is inserted.

Description

[Detailed description of the device]

[0001]

【Technical field】

 The present invention relates to an optical device mount device for attaching and detaching optical devices such as a camera body, an interchangeable lens, various converters, an intermediate ring, and a bellows device.

[0002]

[Prior art and its problems]

 A so-called bayonet mount has been widely used as a mounting device of this type. The bayonet mount has a pair of removable optical devices such as an interchangeable lens and a male mount (lens mount part) and a female mount (body mount part), which are respectively provided on the camera body, and are provided with several claws. Then, by fitting them and rotating them relative to each other, these claws are engaged with each other, and both mount surfaces are firmly contacted by the spring force.

The mount body of such a mount device is conventionally made of a metal material because of the necessity of maintaining precision and strength. Therefore, the contact pin and the ground pin had to be assembled to the mount body while being insulated by the insulating material. 8 to 10 show the assembling structure, and a plurality of insertion holding holes 21 'through which the contact pins 27 or the ground pins 26 are to be inserted into a metal annular mount body 21' to be provided on the camera body side. a is formed. A recess 21'b for absorbing the thickness of the pin holding member 46 holding the contact pin 27 and the ground pin 26 is formed on the back surface of the mount body 21 'corresponding to the plurality of insertion holding holes 21'a. Is made.

The pin holding member 46 is made of an insulating material such as a synthetic resin material, and has a fixing portion 59 that is attached to a mounting plate 51 that is fixed to the front plate 50 of the camera body via a screw 53, and a tip of the contact pin 27. End portion 57a having a plurality of insertion holding holes 57a slidably supporting a small diameter portion (not shown) of the portion 27a or the ground pin 26, and a flange portion 27c of the contact pin 27 or a flange portion of the ground pin 26. It has a flange holding portion 58 having a plurality of insertion holding holes 58a for slidably supporting (not shown). The outer diameter of the tip-end holding portion 57 is configured so that it can be fitted into the insertion holding hole 21'a of the mount body 21, and the rear portion of the contact pin 27 has a supporting portion 27b inserted into the compression spring 31. It is said that. Reference numeral 52 in the figure denotes a flexible circuit board fixed to the mounting plate 51, the plurality of contact pins 27 are electrically connected to the flexible circuit board 52 via the compression springs 31, and the ground pin 26 is a camera. It is grounded by touching the metal part on the body side. The front plate 50 is formed with a recess 50a that absorbs the head of the screw 53.

As described above, in the conventional mounting device, first, the pin holding member 46 is fixed to the camera body side with the screw 53 (FIG. 9), and then the insertion holding holes 21 ′ a corresponding to the plurality of tip holding portions 57. Must be fitted and the mount body 21 'must be fixed to the camera body with the fixing screw 24. Therefore, the pin holding member 46 must be specially prepared in order to insulate the contact pin 27 and the ground pin 26 from the metal mount body 21 ', which increases the number of parts and complicates the structure. .. Further, since the mount main body 21 'is attached to the pin holding member 46 previously fixed to the camera body side, the protrusion amount of the contact pin 27 and the earth pin 26 may be different depending on the mounting state at that time. It was difficult to keep the accuracy constant.

[0006]

[The purpose of the device]

 The present invention has been made on the basis of the awareness of such a conventional mounting apparatus, and an object thereof is to obtain an optical apparatus mounting apparatus having a reduced number of parts and a simplified structure.

[0007]

[Outline of the device]

 The present invention which achieves the above-mentioned object, therefore, has mounting parts as detaching means for the optical devices to be detached from each other, and both of these mounting parts are brought into contact with each other at the time of coupling to make the optical devices conductive. In a mount device for an optical device provided with a conduction pin member, at least one of the mount portions is made of a synthetic resin material, and the conduction pin member is attached to the mount body made of the synthetic resin material. It is characterized in that an insertion holding hole for insertion is formed.

[0008]

[Example of device]

 The present invention will be described below with reference to the illustrated embodiments. As shown in FIG. 7, the interchangeable lens 12 has a lens mount portion 14 that constitutes a mount device. The mount portion 15 is located on the mount portion 15 and is located behind the mount surface 15. An annular groove 16 and a claw portion 17 protruding outward in the radial direction at a predetermined interval and shape are formed on the rear portion of the annular groove 16. Further, the interchangeable lens 12 is provided with a contact pin 19 that comes into contact with the contact pin 27 when mounted on the camera body 30. The contact pin 19 is insulated by the insulating member 19a and is connected to the lens side control circuit 40.

On the other hand, the body mount portion 20 constituting the mount device includes an annular mount body 21 made of a synthetic resin material, a metal reinforcing ring member 22, and a metal spring-loaded ring member 23. have. The mount main body 21 passes through the mount surface 21a that contacts the mount surface 15 of the interchangeable lens 12, the back surface of the mount (not shown) that should come into contact with the support convex portion 44 of the camera body 30, and the claw portion 17 of the interchangeable lens 12. The notch 21c is provided, and a claw portion 21d adjacent to the notch 21c and located on the front surface of the claw portion 17 in the mounted state of the interchangeable lens 12 is provided.

The mount body 21 has a plurality of insertion holes 35 a through which the fixing screws 24 are inserted, insertion holes 35 b through which the AF joint 25 is inserted, insertion holes 35 c through which the lock pins 28 are inserted, and contact pins 27 that are inserted and supported. Has a through hole 56. These elements on the mount body 21 can be precisely formed at predetermined positions by injection molding of a synthetic resin material. The synthetic resin material forming the mount body 21 is preferably an injection-moldable engineering plastic, such as polyphenylene sulphite (PPS), liquid crystal polymer and polycarbonate. Self-lubricating resin or oil-containing resin is used. can do.

As shown in FIGS. 2 and 5, the reinforcing ring member 22 is insert-molded in the mount body 21. Like the mount body 21, the reinforcing ring member 22 has insertion holes corresponding to the fixing screws 24, the AF joints 25, and the lock pins 28. As shown by the broken line in FIG. 4, the reinforcing ring member 22 is notched at the portion corresponding to the plurality of insertion holding holes 56. Therefore, this portion is a synthetic ring member in which the reinforcing ring member 22 does not exist. Since it is made of only a resin material, the plurality of insertion holding holes 56 can hold the inserted contact pin 27 and ground pin 26 in an insulated state.

As is well known, the AF joint 25 applies a driving force for focusing, for example, from the camera body 30 side to the interchangeable lens 12 side, and the lock pin 28 is provided on the interchangeable lens 12 side. It locks and unlocks by engaging and disengaging from the lock hole. The lock pin 28 is biased in a direction projecting from the mount surface mount main body 21a, and is moved backward and backward from the mount surface mount main body 21a by the attachment / detachment operation lever 28a (FIG. 1).

Around the photographing opening of the camera body 30 with the mount body 21 and the spring-loaded ring member 23 removed, a plurality of support projections 44 having screw holes 42 corresponding to the insertion holes 35a of the mount body 21 are provided. Is formed in. The periphery of the photographing opening is formed as a receiving surface 45 that receives the claw portion 17 of the exchange lens 12.

As shown in FIGS. 4 and 6, the spring-loaded ring member 23 includes an annular portion 23a to be fitted into an annular convex portion (not shown) on the back surface of the mount body 21, and the annular portion 23a. It integrally has a ridge portion 23b bent and formed corresponding to the position of the claw portion 21d of the mount body 21. The spring portion 23b, which should be located in the escape portion 36 of the mount body 21 in a state of being mounted on the body mount portion 20, has a chevron portion protruding in the optical axis direction. When the claws 17 of the interchangeable lens 12 that have passed through the notches 21c of the mount body 21 are rotated clockwise in FIG. 1, the three claws 17 that rotate in the same direction in the receiving surface 45 are The corresponding chevron portion of the spring portion 23b is pressed. Due to the spring action of the chevron portion, the claw portion 17 of the interchangeable lens 12 is pushed rearward of the optical axis, and the mount surface 15a of the lens mount portion 14 is brought into close contact with the mount surface 21a of the mount body 21.

The mount main body 21 in which the reinforcing ring member 22 is embedded and the spring-loaded ring member 23 in which the annular portion 23a is fitted on the back surface of the mount main body 21 are fixed to the camera body 30 by the fixing screws 24, and Corresponding elements are inserted into the insertion holes 35a, 35b, 35c and the insertion holding hole 56, respectively. As shown in FIG. 5, the head of the fixing screw 24 is in direct contact with the reinforcing ring member 22, and by making direct contact therewith, there is no risk of the mount body 21 being damaged at the contact portion with the fixing screw. be able to.

A support structure of the contact pin 27 will be described with reference to FIGS. 2 and 3. The insertion holding hole 56 formed in the mount body 21 has a small diameter portion 56a having substantially the same diameter as the front end portion 27a of the contact pin 27 on the front side and a large diameter for slidably supporting the flange portion 27c on the rear side of the small diameter portion 56a. When the contact pin 27 is inserted from the large diameter portion 56b side, the flange portion 27c is brought into contact with the stepped portion of the large diameter portion 56b and the small diameter portion 56a so that the contact pin 27 is mounted. It is possible to make it protrude a predetermined amount from. Further, a fixing portion 57 to which the mounting plate 51 is screwed is formed on the lower portion of the mount body 21. The flexible circuit board 52 of the mounting plate 51 fixed to the back surface of the mount body 21 by the screws 53 is connected to the body side control circuit 41, and the support portion 27b of the contact pin 27 is inserted into the flexible circuit board 52. The rear end of the inserted compression spring 31 is in contact. As a result, the contact pin 27 is connected to the body side control circuit 41 via the compression spring 31. The body side control circuit 41 is connected to the lens side control circuit 40 via the contact pins 27, 19 and the like, and exchanges necessary information with each other. 2 and 3, the support structure of the contact pin 27 to the mount body 21 is described, but the support structure of the ground pin 26 is also the same.

Therefore, in the present mounting apparatus having such a configuration, the contact pin 27 and the ground pin 26 are directly inserted into the insertion holding hole 56 formed in the mount body 21 made of synthetic resin that does not need to be specially insulated. Since it is configured to be inserted and held, it does not require any member such as the pin holding member 46 that has been conventionally used. Therefore, the number of parts can be reduced and the cost can be reduced accordingly. Further, since the contact pin 27 is integrally assembled with the mount main body 21, the assembling work to the camera body 30 can be simplified, and the protrusion amount of the contact pin 27 can be made constant to improve the protrusion accuracy. It is possible to stabilize the contact pressure with the contact pin 17 or the like on the interchangeable lens 17 side by raising the pressure.

Since the mount body 21 is made of a synthetic resin material, its complicated shape can be inexpensively formed by injection molding, and the reinforcing ring member 22 having a role of reinforcing has a simple shape. Since even a metal can be processed at low cost, the processing cost as a whole can be significantly reduced, and a structure that does not sacrifice strength and accuracy can be obtained. Further, since the mount surface 21a is made of a synthetic resin material, no abnormal noise is generated during sliding contact with the mount surface 15. In particular, engineering plastics are excellent in strength, wear resistance, and corrosion resistance, so that even if they are repeatedly attached and detached, there is little change in friction characteristics. Although the mount body 21 is reinforced by the reinforcing ring member 22, the mount body 21 is reinforced by the spring-loaded ring member 23 even if the reinforcing ring member 22 is not provided.

[0019]

[Effect of the device]

 As described above, according to the mounting device of the optical device of the present invention, it is possible to obtain the mounting device having a simple structure with a small number of parts without requiring a special insulating structure for the conduction pin member. The cost can be reduced.

[Brief description of drawings]

FIG. 1 is a front view showing a camera body to which the present invention is applied.

FIG. 2 is a sectional view taken along line II-II of FIG. 1, showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing an enlarged main part of FIG.

FIG. 4 is a perspective view showing a state in which a mount body and a ring member with a spring are removed from a photographing opening of a camera body.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a front view showing a unitary shape of a ring member with a spring.

FIG. 7 is a perspective view showing an example of an interchangeable lens mounted on a mount portion of a camera body.

FIG. 8 is a front view showing a conventional mount body made of a metal material.

FIG. 9 is a front view showing a pin holding member arranged on the back surface of a conventional mount body.

10 is a cross-sectional view taken along the line XX in FIG. 8 assuming that the pin holding member is located on the back surface of the mount body.

[Explanation of symbols]

 12 interchangeable lens (optical device) 14 lens mount part (mount part) 15 mount surface 17 claw part 19 contact pin 20 body mount part (mount part) 21 mount body 26 earth pin (conduction pin member) 27 contact pin (conduction pin member) 27a Tip part 27b Support part 27c Flange part 30 Camera body (optical device) 31 Compression spring 35a 35b 35c Insertion hole 40 Lens side control circuit 41 Body side control circuit 52 Flexible circuit board 56 Insertion holding hole 56a Small diameter part 56b Large diameter part 57 Fixed part

Claims (3)

[Scope of utility model registration request] 1. An optical device to be attached to and detached from each other has a mount portion as an attaching / detaching means, and each of these mount portions is provided with a conduction pin member which comes into contact with each other at the time of coupling to electrically connect the optical devices. In a mount device for an optical device, at least one of the mount parts is made of a synthetic resin material, and a mount body made of the synthetic resin material is provided with an insertion holding hole for inserting the conduction pin member. Characteristic optical device mounting device. 2. The mount device for an optical device according to claim 1, further comprising a flexible circuit board to be electrically connected to the conductive pin member, which is mounted on at least one of the mount bodies. 3. The optical system according to claim 2, wherein the conductive pin member is biased by a compression spring to protrude from at least one of the mount bodies by a predetermined amount, and is electrically connected to the flexible circuit board via the compression spring. Device mounting device.