JP2008015267A - Bayonet mount mechanism and camera system - Google Patents

Abstract

A bayonet mounting mechanism capable of regulating a rotational operation with a simple configuration and reliably positioning at a predetermined angular position is provided.
A lens-side mount portion includes a mount main body, a contact board, a pressing plate, a set screw, and a rotation restricting screw. The mount body 29 is fixed to the rear end portion of the lens barrel portion 66. The mount body 29 has a mount base 36 and bayonet claws 38a to 38c. The rotation restricting screw 35 is fixed at a position connecting the bayonet claw 38 a and the mount base 36 by screwing the screw portion 46 into the screw hole 41 and bringing the retaining portion 48 into contact with the mount base 36. . When the lens unit 12 is mounted on the camera body, when the lens side mount portion 14 is rotated, the rotation restricting screw 35 comes into contact with the bayonet claw of the body side mount portion and is positioned at a predetermined angular position.
[Selection] Figure 4

Description

  The present invention relates to a bayonet mounting mechanism and a camera system including the same.

  Conventionally, a bayonet mount mechanism is known as an attaching / detaching mechanism for interchangeable lens digital cameras and video cameras. In this bayonet mount mechanism, the lens unit and the mount provided on the camera body are in contact with each other. The bayonet claws are engaged with each other by rotating from the side and coupled. Further, in order to securely engage the bayonet claws at a predetermined position, when the mount portion is rotated, a member that regulates the angular position so that one bayonet claw is stopped at a predetermined angle is attached to the other mount portion. It is necessary that the rotation restricting member is in contact with one of the bayonet claws and positions the mount portion at a predetermined angle. Therefore, in the mount mechanism of an optical device described in Patent Document 1, a mount having a bayonet claw is molded from plastic, and a stopper that regulates the rotation angle of the bayonet claw is integrally formed with this component.

  Further, in the conventional bayonet mounting mechanism, as shown in FIG. 10, a screw 101 as a member for regulating the rotation angle is screwed along a radial direction perpendicular to the rotation axis of the mount unit 100. The screw 101 is disposed at a position close to one end of the bayonet claw 102 a and the mount base 103 among the plurality of bayonet claws 102 a to 102 c. When the mount portion is rotated, the bayonet claws on the other side come into contact with the screw 101 to restrict the rotation, so that the bayonet claws are securely engaged with each other at a predetermined angular position.

On the other hand, in recent years, as a new form of digital camera, an image sensor such as a CCD is incorporated in the lens unit, and image data formed from an image signal acquired by the image sensor incorporated in the lens unit is transferred to the camera body. A configuration for storing in a storage medium such as a memory card has been studied. When the bayonet mount mechanism is used to connect the lens unit and camera body having such a configuration, when the lens unit is mounted, the electrical signal contacts provided around the mounts are brought into contact with each other, and these contacts are met to meet the image. You must send and receive electrical signals such as data.
Japanese Examined Patent Publication No. 7-34095

  However, the bayonet mounting mechanism described in Patent Document 1 may be insufficient in strength because most of the mounting portion is molded from plastic. In particular, the digital camera as described above has a bayonet mounting mechanism. In this case, if the plastic molded bayonet claws and the like are worn due to deterioration over time, the positioning accuracy is also lowered, which may affect the contact of the electrical signal contacts.

  Further, as described above, when an inexpensive screw is used as the rotation restricting member, it is very difficult to fix an appropriately sized screw to the mount portion with the conventional bayonet mounting mechanism. That is, as shown in FIG. 10, the rotation restricting screw 101 is arranged between one end portion of the bayonet claw 102a and the mount base 103, and the periphery of the bayonet claw 102a and the mount base 103 is between parts. Clearance is narrow, and there is little space for placing the rotation restricting screw 101. The space between the bayonet claws 102a to 102c is a space through which the other bayonet claws pass, and the gap between the bayonet claws 102a to 102c and the mount base 103 is inserted when the other bayonet claws are rotated. Therefore, the space for disposing the rotation restricting screw 101 is limited to a space where there is only a small space between one end of the bayonet claw 102a and the mount base 103 and the screw diameter to be used is small. Moreover, since it is easy to interfere with a bayonet nail | claw and a mount base at the time of screwing, the assembly process took much time and effort.

  The present invention has been made in view of the above circumstances, and provides a bayonet mounting mechanism and a camera system that can regulate a rotational operation with a simple configuration and can be surely positioned at a predetermined angular position at a low cost. With the goal.

  In order to solve the above-described problem, in the bayonet mounting mechanism of the present invention, a base member, a first mount portion including a plurality of first bayonet claws formed integrally with the base member, and the base member are contacted. A mount base portion having a mount reference surface in contact with the second base portion, and a second mount portion having a plurality of second bayonet claws corresponding to the first bayonet claws, wherein the mount reference surface is brought into contact with the base member. A bayonet mounting mechanism that couples the mount parts by rotating the rotation of one of the first and second mount parts and engaging the first and second bayonet claws with each other. And arranged along an axial direction substantially parallel to a rotation axis when performing the rotation operation, and any one of the second bayonet claws, A rotation regulating screw that penetrates the und base and is screwed to at least one of the mount base and the second bayonet claw on the second mount, and when performing the rotation operation, The first bayonet pawl is in contact with the rotation restricting screw to restrict the rotation of the first and second mount portions.

  3. The bayonet mounting mechanism according to claim 2, wherein the mount includes a base member, a first mount portion having a plurality of first bayonet claws formed integrally with the base member, and a mount reference surface that comes into contact with the base member. A main body and a second mount portion having a plurality of second bayonet claws corresponding to the first bayonet claws, wherein the first reference and the base reference member are in contact with the mount reference surface. In the bayonet mounting mechanism that couples the mount parts by rotating one of the second mount parts and meshing the first and second bayonet claws with each other, the mount body includes: A metal made of metal, having the mount reference surface, and at least a part of the second bayonet claw formed integrally. And a resin molded member that is formed of a resin and is attached to the mount base along an axial direction substantially parallel to a rotation axis when performing the rotation operation, and the resin molded member extends in the axial direction. And a rotation restricting protrusion that protrudes toward the mount reference surface is integrally formed. When the rotation operation is performed, the first bayonet claw comes into contact with the rotation restricting protrusion and the first and second The rotation of the mounting portion is restricted.

  According to a third aspect of the present invention, there is provided a camera system comprising: a camera body having one of the first and second mount portions according to the first or second aspect; and a lens unit having the other. A camera system for connecting the lens unit and the camera body by coupling, wherein the second mount portion is provided with an electrical contact for transmitting and receiving an electrical signal to and from a contact portion provided on the first mount portion. The resin molded member is a substrate holding member that holds the circuit board, and the first bayonet claw abuts against the rotation restricting protrusion when performing the rotation operation. When the rotation is restricted, the electrical contact comes into contact with the contact portion, and the lens unit and the camera body are electrically connected.

  Furthermore, in the camera system according to claim 4, the camera system includes the camera body including the first mount portion according to claim 1 and the lens unit including the second mount portion, and the bayonet mount mechanism is coupled. The lens unit and the camera body are connected with each other, wherein the resin molding member is an optical system holding member that holds at least a part of a photographing optical system built in the lens unit. And

  According to the bayonet mounting mechanism and the camera system using the same according to the present invention, the mount portion is disposed along an axial direction substantially parallel to the rotation axis when the mount portion is rotated, and mounted on either of the second bayonet claws. The second mount portion is provided with a rotation restricting screw that passes through the base portion and is screwed to at least one of the mount base portion and the second bayonet claw. When the rotation operation is performed, the first bayonet is provided. Since the claw comes into contact with the rotation restricting screw and the rotation of the first and second mount parts is restricted, the rotation operation can be restricted with a simple configuration and the positioning can be surely performed at a predetermined angular position.

  A mount base formed of metal and having the mount reference surface and at least a part of the second bayonet claw formed integrally; and a rotation shaft formed of resin and performing the rotation operation; The mount body is composed of a resin molded member attached to the mount base along a substantially parallel axial direction, and the resin molded member is integrally formed with a rotation restricting projection protruding to the mount reference plane along the axial direction. When the rotation operation is performed, the first bayonet claw comes into contact with the rotation restricting protrusion and the rotation of the first and second mount portions is restricted. Since the rotation restricting protrusion is formed on the resin molded member constituting a part of the mount, an increase in cost can be suppressed.

  In FIG. 1, a digital camera 10 is a camera system that includes a camera body 11 and a lens unit 12, and the lens unit 12 is detachably attached to the camera body 11. The camera body 11 is provided with a body side mount portion 13 (first mount portion), and the lens unit 12 is provided with a lens side mount portion 14 (second mount portion). The bayonet mounting mechanism 15 of the present invention is constituted by these mounting portions 13 and 14.

  As shown in FIG. 2, the body side mount portion 13 includes a base member 21 formed in a ring shape, three bayonet claws 22 a to 22 c formed integrally with the base member 21, and an opening portion of the base member 21. , A contact board 24a to 24c for electrical connection with the lens unit 12, a coil spring 25 (see FIG. 5), and a lock pin 26. In FIG. 2, a state in which the barrier member 23 is retracted to the retracted position is illustrated in order to easily represent the configuration of the mount portion 13. The bayonet claws 22a to 22c are formed so as to protrude from the inner peripheral surface of the base member 21 toward the center. The barrier member 23 is urged by the coil spring 25 from the back side toward the base member 21 side. In the present embodiment, the mount portions 13 and 14 are provided with three bayonet claws. However, the present invention is not limited to this, and the number of bayonet claws may be two or four.

  Further, a lock pin 26 is attached to the base member 21, and when the lens unit 12 is attached to the camera body 11, the lock pin 26 is engaged with an engagement hole 43 ( 3), the rotation of the lens unit 12 is locked. This prevents the lens unit 12 from rotating and falling off the camera body 11.

  The contact substrates 24a to 24c are arranged behind the bayonet claws 22a to 22c, respectively. The contact substrates 24a to 24c have contact groups 27a to 27c, respectively. The contact groups 27a to 27c are composed of a plurality of contacts 28 (66 in each of the contact substrates 24a to 24c in this embodiment) mounted on the contact substrates 24a to 24c, respectively, and the lens unit 4 is attached to the camera body 3. They are arranged in parallel along the rotation direction. Note that the position and number of contacts are not limited to these, and may be changed as appropriate.

  As shown in detail in FIGS. 3 and 4, the lens side mount portion 14 includes a mount main body 29, a contact board 31, a pressing plate 32, a set screw 33, and a rotation regulating screw 35. The mount body 29 is fixed to the rear end portion of the lens barrel portion 66.

  As shown in detail in FIG. 4, the mount main body 29 includes a mount base 36, a cylindrical portion 37 positioned substantially at the center of the mount base 36, and bayonet claws 38 a to 38 c protruding from the outer periphery of the cylindrical portion 37. Is provided. The mount base 36 is formed in a substantially disk-like plate shape, and has a through hole 42 and an engagement hole 43 described later. The engagement hole engages with the lock pin 26 when the lens unit 4 is attached to the camera body 3. The rear end surface 36a of the mount base portion 36 is a mount reference surface for mounting on the camera body 11, and as shown in FIG. 5, the front end of the base member 21 of the body side mount portion 13 when mounted on the camera body 11. It abuts on the surface 21a.

  Furthermore, in this embodiment, the screw hole 41 is formed in one bayonet claw 38a among the bayonet claws 38a to 38c, and the through-hole 42 is formed in the mount base 36 that is in a position facing the screw hole 41. Yes. The screw hole 41 is formed along a rotation axis when performing a rotation operation when mounted on the camera body 11, that is, along a direction substantially parallel to the central axis CL of the mount base 36 and the cylindrical portion 37. A through hole 42 is formed coaxially with the screw hole 41. The through hole 42 penetrates from the rear end surface (mount reference surface) 36a of the mount base 36 described above to the front end surface 36b on the back side.

  The rotation restricting screw 35 has a screw portion 46 that is screwed into the screw hole 41 at its tip, and is further formed coaxially and continuously with the screw portion 46 and is fitted into the through hole 42. 47 and a retaining portion 48 formed at the end opposite to the screw portion 46. The screw hole 41 and the screw portion 46 have a smaller diameter than the through hole 42 and the fitting portion 47, and the retaining portion 48 has a diameter larger than that of the through hole 42. When attaching the rotation restricting screw 35 to the mount body 29, the screw portion 46 passes through the through hole 42 from the front end face 36 b side and is screwed into the screw hole 41, and the fitting portion 47 is fitted into the through hole 42. Mate. Then, the rotation restricting screw 35 is fixed to a position connecting the bayonet claw 38 a and the mount base 36 by screwing the stopper 48 to the position where it comes into contact with the front end surface 36 b of the mount base 36.

  Further, as shown in FIG. 4, the mount body 29 is formed with an opening 51 that is continuously cut out from the rear end surface of the cylindrical portion 37 to the bayonet claws 38 a to 38 c. The opening 51 has a shape in which three fan shapes corresponding to the bayonet claws 38 a to 38 c protrude from a circular peripheral edge that is slightly smaller than the outer shape of the cylindrical portion 37. In the present embodiment, the opening 51 and the screw hole 41 are formed so as to be displaced from each other, and the rotation restricting screw 35 attached to the mount main body 29 and the contact board 31 do not interfere with each other. In addition, three screw holes 51 a are formed in the opening 51.

  As shown in detail in FIG. 4, the contact board 31 has a shape that matches the opening 51 of the mount body 29, and is fitted into the opening 51 and fixed to the mount body 29. The contact board 31 includes a central disc portion 52 and projecting portions 53 a to 53 c projecting from the disc portion 52. The protrusions 53a to 53c are fitted inside the bayonet claws 38a to 38c, respectively. Contact groups 54a to 54c as electrical signal contacts are mounted on the protrusions 53a to 53c, respectively. The contact board 31 has a screw hole 31a. The contact groups 54a to 54c are formed in accordance with the positions of the contact groups 27a to 27c formed on the contact substrates 24a to 24c of the camera body 11, and the same number of contacts 56 as the contacts 28 constituting the contact groups 27a to 27c. Consists of.

  The holding plate 32 is formed in accordance with the disk portion 52 of the contact board 31 and has a screw hole 32a. The contact board 31 is sandwiched between the mount body 29 and the holding plate 32 and fixed by screwing a set screw 33 into the screw holes 51a, 31a, 32a and fastening them together. In this way, the lens side mount portion 14 is assembled by attaching the rotation restricting screw 35, the contact board 31, and the holding plate 32 to the mount body 29.

  The contacts 56 formed on the contact board 31 of the lens unit 12 are formed on the contact boards 24a to 24c of the camera body 11 when the lens unit 12 is stopped at a predetermined angular position when the camera unit 11 is mounted. Each contact is made with a contact 28. As a result, the camera body 11 and the lens unit 12 are electrically connected.

  As shown in FIG. 1, a lock release button 61 is provided in the vicinity of the mount portion 13 on the front surface of the camera body 11 to which the present embodiment is applied. When the lock release button 61 is pressed while the lens unit 12 is attached to the camera body 11, the lock pin 26 moves rearward in conjunction with this operation, and the lock pin 26 and the engagement hole 43. Is disengaged. The lens unit 12 can be detached from the camera body 11 by rotating the lens unit 12 in the direction opposite to the rotation direction A while pressing the lock release button 61. Furthermore, a strobe 62 is provided on the upper front of the camera body 11. Provided on the upper surface of the camera body 11 are a shutter button 63 that is pressed when shooting and a switching dial 64 that is rotated when switching between the shooting mode and the playback mode. Furthermore, a power switch and an LCD (not shown) are provided on the back of the camera body 11.

  Furthermore, the lens unit 12 includes the lens barrel 66 and the mount portion 14 described above. The photographing lens 67 is exposed on the front surface of the lens barrel 66, and the rear end portion is mounted by screwing or the like. The part 14 is fixed. The lens unit 12 is provided with a CCD image sensor (hereinafter simply referred to as a CCD) 68, which is a solid-state image pickup device for picking up a subject image formed by the photographing lens 67, a control circuit board, and the like. It has been.

  As the lens unit 12, various types such as those with different focal lengths of the photographing lens 13, those with different numbers of pixels of the CCD 16, those capable of monochrome photographing, and those capable of infrared photographing are prepared in an interchangeable manner. The

  The operation of the above configuration will be described. When attaching the lens unit 12 to the camera body 11, first, the bayonet claws 38a to 38c of the lens unit 12 are aligned between the bayonet claws 22a to 22c of the camera body 11 and inserted into the mount reference surface 36a. Is brought into contact with the front end surface 21 a of the base member 21. Then, while maintaining this contact state, the lens unit 11 is rotated along the rotation direction A with respect to the camera body. When the rotation operation is performed along the rotation direction A, the rotation regulating screw 35 comes into contact with the bayonet claw 22a (the state shown in FIG. 5). The lens unit 11 in which the rotation restricting screw 35 is in contact with the bayonet claw 22a is restricted from rotating in the rotation direction A, and is positioned at a predetermined angular position where the bayonet claws 22a to 22c and the bayonet claws 38a to 38c mesh with each other. Then, the lock pin 62 is engaged and locked in the engagement hole 43 of the mount portion 14, and the lens unit 11 is in the mounted state. Since the rotation of the lens unit 12 is regulated by the rotation regulating screw 35 in this way, the bayonet claws 22a to c and 38a to c are securely engaged with each other, and the camera body 11 and the lens unit 12 are coupled with high accuracy. be able to. Further, since the mount portions 13 and 14 are positioned at a predetermined angular position, the contacts 24a to 24c and the contacts 38a to 38c are electrically connected to each other, and an electric signal can be exchanged. Furthermore, since the rotation restricting screw 35 is attached along the direction substantially parallel to the rotation axis CL and fixed to the mount body 29, the degree of freedom in selecting the size of the rotation restricting screw 35 is high. The space efficiency around the bayonet claws 38a to 38c is improved. Therefore, the assembly process of the rotation restricting screw 35 is facilitated, and the cost can be reduced.

  In the first embodiment, the configuration for restricting the rotation operation by bringing the rotation regulating screw into contact with the bayonet claw is illustrated, but the present invention is not limited to this and will be described below. In the second embodiment of the present invention, a configuration is shown in which a rotation restricting protrusion is integrally formed on a resin molded member constituting a part of the mount, and the rotation operation of the mount is restricted by the rotation restricting protrusion. An example of a digital camera to which the second embodiment is applied is shown in FIGS. Note that in the digital camera shown in the present embodiment, the same components and members as those in the above embodiment are denoted by the same reference numerals and description thereof is omitted. In addition, the camera body and the body-side mount portion are the same as those in the above-described embodiment, and thus description thereof is omitted.

  The lens unit 70 includes a lens barrel portion 66 and a lens side mount portion 71. In the present embodiment, a bayonet mounting mechanism is constituted by the lens side mount portion (second mount portion) 71 and the body side mount portion (first mount portion) 11. As shown in detail in FIGS. 6 and 7, the lens side mount portion 71 includes a mount main body 72, a substrate holding member (resin molding member) 73, a contact substrate 31, a holding plate 32, a set screw 33, and the like. The mount body 72 is fixed to the lens barrel portion 66. The mount main body 72 is integrally formed with a mount base 76, a cylindrical portion 77 located substantially at the center of the mount base 76, a screwing boss 78, and bayonet claw main bodies 79a to 79c.

  The mount base 76 is formed in a substantially disk-like plate shape, and an engagement hole 80 is formed. The engagement hole 80 engages with the lock pin 26 when attached to the camera body 11. Further, the rear end surface 76a of the mount base 76 is a mount reference surface for mounting on the camera body 11, and as shown in FIG. 8, the rear end surface 76a contacts the front end surface 21a of the base member 21 when mounted on the camera body 11. Make contact. The bayonet claw bodies 79 a to 79 c are arranged so as to protrude from the outer peripheral surface of the cylindrical portion 77. The screwing boss 78 is located inside the cylindrical portion 77.

  As shown in FIG. 7, the substrate holding member 73 includes a disk part 81, protrusions 82 a to 82 c protruding from the outer periphery of the disk part 81, an opening 83, a fitting protrusion 84, and a rotation restricting protrusion. 85. In the present embodiment, the rotation restricting protrusion 85 is integrally formed with one of the protrusions 82a to 82c. The rotation restricting protrusion 85 is formed so as to extend along a rotation axis when the mount 71 is rotated when mounted on the body side mount, that is, along a direction substantially parallel to the central axis CL of the mount main body 72. Yes. The opening 83 is formed according to the outer shape of the contact board 31. The fitting convex portion 84 is one step convex from the periphery in accordance with the inner peripheral surface 77 a of the cylindrical portion 77. The substrate holding member 73 has a screw hole 73 a inside the opening 83.

  The protrusions 82 a to 82 c of the substrate holding member 73 are formed in substantially the same position and the same outer shape as the bayonet claw bodies 79 a to 79 c of the mount body 72, and the substrate holding member 73 is attached to the mount body 72. When these protrusions 82a to 82c and bayonet claw bodies 79a to 79c are integrated, they form bayonet claws 86a to 86c (see FIG. 6).

  When assembling the lens side mount portion 71, the fitting convex portion 84 of the substrate holding member 73 is moved along the rotation axis CL of the cylindrical portion 77 while the positions of the protruding portions 82a to 82c are aligned with the positions of the bayonet claw bodies 79a to 79c. The inner circumferential surface 77a is fitted. Further, the contact substrate 31 is fitted into the opening 83 of the substrate holding member 73. The contact-side substrate 31 is sandwiched between the holding plate 32 and the substrate holding member 73, and the fixing screw 33 is screwed into the screw holes 31a, 32a, 73a and the screwing boss 78 and fixed together to fix the lens side mount portion. 71 is assembled.

  The operation of this embodiment will be described below. When the lens unit 70 is attached to the camera body 11, the bayonet claws 86a to 86c of the lens unit 70 are aligned between the bayonet claws 22a to 22c of the camera body 11, and the mount reference surface 76a is inserted. The base member 21 is brought into contact with the front end surface 21a. Then, the lens unit 70 is rotated along the rotation direction A with respect to the camera body 11 while maintaining this contact state. When this rotation operation is performed, the rotation restricting protrusion 85 comes into contact with the bayonet claw 22a to restrict the rotation of the lens unit 70, and the bayonet claw 22a-c and the bayonet claw 86a-c are positioned at a predetermined angular position where they mesh with each other. Is done. Since the rotation is restricted by the rotation restricting protrusion 85 in this manner, the mount parts 13 and 71 can be coupled with high accuracy. Furthermore, since the rotation restricting protrusion 85 is formed integrally with the substrate holding member and the substrate holding member 73 is formed of plastic, the number of parts can be reduced and the cost increase can be suppressed. Further, since the mount body 72 is made of metal, the mount portion 71 can have sufficient strength.

  Note that, in the second embodiment, when it is desired to further secure the strength of the rotation restricting protrusion 85, as shown in FIG. 9, the structure includes a reinforcing screw 90 for screwing the rotation restricting protrusion 85 to the mount body 72. do it. The reinforcing screw 90 is preferably disposed along an axial direction substantially parallel to the central axis of the mount body 72. As a result, as in the first embodiment, the degree of freedom of screw selection is increased, which is advantageous in reducing costs.

  In the second embodiment, the rotation restricting protrusion is integrally formed on the substrate holding member that holds the circuit board. However, the present invention is not limited to this, and the component that constitutes a part of the mount portion is used. For example, a resin molded member integrally formed with a rotation restricting protrusion is used as an optical system holding member for holding any lens of the photographing optical system built in the lens unit. May be fixed to the metal mount body.

It is a perspective view which shows the structure of a digital camera. It is a top view which shows the structure of the mount part of a camera body. It is a perspective view which shows the structure of the mount part periphery of a lens unit. It is a disassembled perspective view which shows the structure of a lens side mount part. It is principal part sectional drawing of the bayonet mounting mechanism periphery with which the mount part couple | bonded together. It is a perspective view which shows the structure of the mount part periphery of the lens unit to which 2nd Embodiment is applied. It is a disassembled perspective view which shows the structure of the lens side mount part to which 2nd Embodiment is applied. It is principal part sectional drawing of the bayonet mount mechanism periphery with which the mount part to which 2nd Embodiment was applied couple | bonded together. It is principal part sectional drawing which shows the modification of 2nd Embodiment. It is an external appearance perspective view of the conventional mount part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Digital camera 11 Camera body 12 Lens unit 13 Body side mount part (1st mount part)
14, 71 Lens side mount (second mount)
15 Bayonet mounting mechanism 22a-c Bayonet claw (first bayonet claw)
38a-c, 86a-c Bayonet claw (second bayonet claw)
35 Rotation restricting screw 73 Substrate holding member (resin molding member)
85 Rotation restricting projection

Claims (4)

A base member, a first mount portion including a plurality of first bayonet claws formed integrally with the base member, a mount base portion having a mount reference surface in contact with the base member, and the first bayonet claws One of the first and second mount portions from a state in which the mount reference surface is in contact with the base member. In the bayonet mounting mechanism that couples the mount parts by engaging the first and second bayonet claws with each other by performing a rotating operation to rotate
Arranged along an axial direction substantially parallel to a rotation axis when performing the rotation operation, penetrates one of the second bayonet claws and the mount base, and the mount base and the second bayonet claw The second mount portion is provided with a rotation restricting screw that is screwed to at least one of the first bayonet pawl and the first bayonet claw abuts against the rotation restricting screw when the rotating operation is performed. A bayonet mounting mechanism characterized in that rotation of the first and second mounting portions is restricted. A first mount portion having a base member and a plurality of first bayonet claws formed integrally with the base member; a mount main body having a mount reference surface in contact with the base member; and the first bayonet claws. A second mount portion having a plurality of corresponding second bayonet claws, and from the state in which the mount reference surface is in contact with the base member, either one of the first and second mount portions is In the bayonet mounting mechanism that couples the mount parts by performing a rotating operation to rotate and meshing the first and second bayonet claws with each other,
The mount body is made of metal, has the mount reference surface, and is formed of a resin and a mount base formed integrally with at least a part of the second bayonet claw, and performs the rotation operation. A resin molding member attached to the mount base along an axial direction substantially parallel to the rotation axis of the lens, and the resin molding member integrally has a rotation restricting projection protruding to the mount reference surface along the axial direction. The bayonet is characterized in that when the rotation operation is performed, the first bayonet claw abuts against the rotation restricting protrusion and the rotation of the first and second mount parts is restricted. Mount mechanism. A camera body comprising one of the first and second mount portions according to claim 1 and a lens unit comprising the other, and connecting the lens unit and the camera body by coupling the bayonet mount mechanism. A camera system that performs
The second mount part includes a circuit board provided with an electrical contact for transmitting and receiving an electrical signal to and from a contact part provided in the first mount part, and the resin molded member includes the circuit board. When the first bayonet claw abuts against the rotation restricting projection and the rotation is restricted when the rotation operation is performed, the electrical contact comes into contact with the contact and A camera system, wherein a lens unit and the camera body are electrically connected. 3. A camera body comprising the first mount part according to claim 1 and a lens unit comprising a second mount part, wherein the lens unit and the camera body are connected by coupling of the bayonet mount mechanism. A camera system,
The camera system according to claim 1, wherein the resin molding member is an optical system holding member that holds at least a part of a photographing optical system built in the lens unit.

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