JP2010026313A - Bayonet mount - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bayonet mount having a simple configuration. <P>SOLUTION: A first member 11 on one side of the bayonet mount 10 being attachable or detachable by rotating includes a first plastic supporting member 20 and a first ring member 30 like a metallic plate. A second member 12 on the other side includes a second plastic supporting member 40 and a second ring member 50 like a metallic plate. The first supporting member has such a shape that is constituted by a simple cylinder including a first cylindrical body-supporting face 21 and a first ring-supporting face 24 rising vertically as a basic form. The second supporting member 40 also has such a shape that is constituted by a simple cylinder including a second cylindrical body-supporting face 41 in contact with the first body-supporting face 21 as a basic form. Consequently, these supporting members 20 and 40 can be simply manufactured by molding by use of a mold, and the ring members 30 and 50 can be simply manufactured by pressing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bayonet mount used for attaching / detaching an interchangeable lens.

  Patent Document 1 describes providing a bayonet mount that does not require cutting of a metal material, is easy to manufacture, can be reduced in weight, has high strength, and is resistant to wear. The bayonet mount member of Patent Document 1 includes a mount body having a mount surface, an annular mounting ring extending in the center direction from the inner edge of the mount body, and a bayonet claw formed by rising from the tip of the mounting ring. The mount body and the mounting ring are configured by combining bayonet claws, a plastic material member, and a metal material member, and the metal material member is integrally configured throughout.

  Patent Document 2 describes that when the detachable mount for an interchangeable lens is integrally formed of plastic including a bayonet claw, the problem of strength reduction of the bayonet claw when applied to a telephoto lens or a large aperture lens is described. Yes. The optical apparatus described in Patent Document 2 is a first bayonet claw that is integrally formed by plastic injection molding having a mount reference surface, a first bayonet claw that is coupled to the camera, and a bayonet claw that is engaged with the bayonet claw of the fixed portion. A mount is obtained by comprising a metal bayonet ring having two bayonet claws and engaging and fixing the second bayonet claws to the bayonet claws of the fixing portion.

Patent Document 3 describes that in a bayonet mount made of plastic, the strength of the bayonet portion is improved particularly against a radial load without increasing the size of the mount. The bayonet mount of Patent Document 3 has bayonet engaging grooves formed by radially protruding bayonet claws on the outer periphery of the cylindrical wall of the mount, and the inner periphery of the cylindrical wall faces the bayonet engaging groove. And a thickened portion that protrudes radially inward and generally extends in the circumferential direction. A mounting screw hole is formed in the mounting flange while avoiding the vicinity of the notch formed in the thickened portion in order to avoid interference with the camera side signal pin and the like. Improves the strength of the entire mount, especially against radial loads.
Japanese Patent Laid-Open No. 2004-21170 JP-A-6-27520 JP-A-9-160109

  The bayonet mount described in Patent Document 1 is a composite of a plastic material member and a metal material member. Specifically, the metal material member is embedded when the plastic material member is molded. . The bayonet mount described in Patent Document 2 requires a metal bayonet ring having a three-dimensional complicated shape. All of the bayonet mounts described in Patent Document 3 are plastic bayonet mounts, and there is concern about durability, particularly durability and accuracy when the number of times of attachment / detachment is repeated.

  That is, the metal bayonet mount has good durability, particularly durability and accuracy when the number of attachments / detachments is repeated. Conventionally, the bayonet mount is made of a metal member. The bayonet mount with a complicated structure creates a claw and a reference surface at the same time by cutting a metal block material. In order to create the claw portion, not only lathe processing but also precise milling is required, and the machining process is complicated and the manufacturing cost increases. In addition, since many bayonet mounts use a claw portion as a fitting portion for aligning the central axis, the processing accuracy of the claw portion is required, which causes a cost increase. Therefore, a bayonet mount using a plastic material has been proposed, but there is a further demand for a bayonet mount that is excellent in durability and low in manufacturing cost.

  One embodiment of the present invention is a bayonet mount including a first member and a second member that can be attached and detached by rotating. The first member includes a plastic first support member. The first support member has a cylindrical first main body support surface and a first main body at the base end of the first main body support surface. And a first step shape that forms a first ring support surface rising perpendicular to the support surface. Further, the first member is a metal plate-like first plate attached to the first support member so as to be supported by the first step-shaped first ring support surface and the first main body support surface. The first ring member includes a plurality of first bayonet claws that rise vertically from the first body support surface.

  On the other hand, the second member includes a second support member made of plastic. The second support member has a second main body support surface that is cylindrical and is in contact with the first main body support surface, and a second main body. In order to form a groove bottom surface having a width wider than the thickness of the first bayonet claw at the tip of the support surface at a position where it falls with respect to the second body support surface, In order to form a ring receiving surface at the position of the groove bottom surface at the tip of the groove bottom surface, the second step shape forming the groove side surface falling vertically, and perpendicular to the groove bottom surface And a third step shape forming a second ring support surface that falls. Furthermore, the second member is a metal plate-like second ring member attached to the second support member so as to be supported by the second step-shaped second ring support surface and the ring receiving surface. The second ring member includes a plurality of second bayonet claws that rise vertically from the bottom surface of the groove. The width of the ring receiving surface of the plastic second support member is at least the same as the thickness of the second ring member. Further, the second member is a pressure that protrudes from the groove side surface in order to press the first bayonet claw in the receiving groove formed by the groove bottom surface, the groove side surface, and the second bayonet claw against the second bayonet claw. Means.

  The first member of the bayonet mount includes a combination of a first support member made of plastic based on a cylindrical surface and a step shape, and a first ring member made of metal and plate. The second member also includes a combination of a plastic second support member based on a cylindrical shape and a metal plate-like second ring member.

  The first support member and the second support member, which are based on a simple cylindrical surface and a stepped shape, can be very easily manufactured as plastic molded members. Then, the cylindrical first main body support surface of the first support member and the cylindrical second main body support surface of the second support member are in contact with each other, so that the first member and the second member are And the positions of the first and second members are determined. The first and second body support surfaces are cylindrical surfaces, for example, the first body support surface is a cylindrical outer surface, and the second body support surface is a cylindrical inner surface. Can be manufactured with high precision by mold molding, and further, since the contact area can be increased, it has excellent durability.

  The metal plate-like first and second ring members can be manufactured very simply and inexpensively by press sheet metal working. Further, in this bayonet mount, the first bayonet claw constituted by a metal ring member and the second bayonet claw come into contact with each other. Further, the first and second bayonet claws are portions that directly receive pressure from the pressurizing means. Therefore, this bayonet mount is excellent in durability with little deterioration in accuracy due to wear, particularly pressure wear, even if the number of attachments / detachments increases.

  The first member of the first form of the bayonet mount includes a cylindrical first support member having an outer peripheral surface serving as a first main body support surface. The first ring support surface rises radially outward (outer peripheral side) of the first main body support surface. The first bayonet claw of the first ring member protrudes outward in the radial direction (outer peripheral side).

  The 2nd member of the 1st form is provided with the 2nd support member which the inner peripheral surface turned into the 2nd main part support surface. The groove side surface falls outward in the radial direction of the second main body support surface, and the second ring support surface falls outward in the radial direction of the groove bottom surface. The second bayonet claw of the second ring member protrudes radially inward (inner peripheral side).

  The 1st member of the 2nd form of a bayonet mount is provided with the 1st support member which the inner peripheral surface turned into the 1st main part support surface. The first ring support surface rises radially inward (inner peripheral side) of the first main body support surface. The first bayonet claw of the first ring member protrudes radially inward (inner peripheral side).

  The second member of the second form includes a cylindrical second support member whose outer peripheral surface is the second main body support surface. The groove side surface falls inward in the radial direction of the second body support surface, and the second ring support surface falls inward in the radial direction of the groove bottom surface. The second bayonet claw of the second ring member protrudes radially outward (outer peripheral side).

  The pressurizing means preferably includes a ball member provided so as to be exposed from the groove side surface, and a spring member for pressurizing the ball member so as to be exposed from the groove side surface. When the first bayonet claw is rotated in the receiving groove, the ball member having a spherical surface has a low resistance. Further, by providing a locking groove into which the ball member fits in the first bayonet claw, it is possible to prevent the first bayonet claw from rotating carelessly.

  Another aspect of the present invention is an optical apparatus having a first optical component and a second optical component. The first optical component includes one of the first member and the second member of the bayonet mount, and a lens (lens system, at least one lens). The second optical component includes the other of the first member and the second member, a lens (lens system, at least one lens), an imaging device, and / or an image generation device.

  FIG. 1 is a cross-sectional view showing a schematic configuration of an optical apparatus using a bayonet mount according to the present invention. The optical device 1 is a projector, and includes an image generation device 2 and a projection lens unit (projector lens unit, hereinafter referred to as a lens unit) 3. The image generating apparatus 2 typically includes a light source and a modulation mechanism (light valve) such as a liquid crystal panel (LCD) or DMD. The projection light generated (modulated) by the image generating device 2 is projected onto a screen (not shown) by the lens system 4 housed in the lens unit 3. The lens unit 3 includes a lens system 4 that includes a plurality of lenses 9 and a lens holder 5 that houses the lens system 4.

  As shown in FIG. 2, the lens holder 5 includes a first holder (first optical component) 6 that houses a lens 9 of a part 4 a of the lens system 4 and a lens of another part 4 b of the lens system 4. 9 can be divided into a second holder (second optical component) 7 in which 9 is accommodated. These first holder 6 and second holder 7 are detachable by a bayonet mount 10. In this example, one end 6 a of the first holder 6 includes the first member 11 of the bayonet mount 10, and one end 7 a of the second holder 7 includes the second member 12 of the bayonet mount 10. Including.

  The first member 11 is a plastic first support member 20 constituting the end 6a of the first holder 6 and a metal (for example, stainless steel) attached to the first support member 20 in a plate shape. First ring member 30. The second member 12 is a plastic second support member 40 constituting the end portion 7a of the second holder 7, and a metal (for example, stainless steel) attached to the second support member 40 and has a plate shape. Second ring member 50. The bayonet mount 10 has a configuration corresponding to the first form.

  In FIG. 3, the 1st supporting member 20 which comprises the 1st member 11, and the 1st ring member 30 are shown in the expanded state. FIG. 4 shows a state where the first ring member 30 is attached to the first support member 20. The first support member 20 is a plastic cylindrical member that extends from the main body 6b of the plastic first holder 6 as a whole, and includes a cylindrical outer peripheral surface 21. This outer peripheral surface is the first outer peripheral surface 21. A main body support surface 21 is provided. The base end 22 where the first main body support surface 21 is connected to the main body 6 b has a first stepped shape 23, and the first ring support surface 24 rising perpendicular to the first main body support surface 21 is provided. Forming. That is, in the first member 11, the first ring support surface 24 rises radially outward (outer peripheral side) of the first main body support surface 21.

  The first ring member 30 of the first member 11 includes an inner peripheral surface 31 in contact with the first main body support surface 21. The inner diameter of the first ring member 30 is equal to the outer diameter of the portion of the first main body support surface 21 of the first support member 20 within a tolerance range, and the first ring member 30 has the first support member 20. A portion where the first main body support surface 21 of the tip 25 is formed can be inserted. Therefore, the first ring member 30 has a shape that is supported by the first ring support surface 24 and the first main body support surface 21 of the first step shape 23. Furthermore, the first ring member 30 includes a plurality of first bayonet claws 33 that rise vertically and intermittently from the first body support surface 21 when supported by the first stepped shape 23. In this example, the first bayonet claw 33 of the first ring member 30 protrudes radially outward (outer peripheral side) with respect to the first main body support surface 21.

  On the outer peripheral portion of the first bayonet claw 33, a groove 35 into which a locking ball described later is fitted is formed. The first ring member 30 is fixed to the first ring support surface 24 of the first support member 20 with a plurality of screws 39. When the first ring member 30 is attached to the ring support surface 24 of the first support member 20, as shown in FIG. 4, the first bayonet claws made of metal from the base end 22 of the first body support surface 21. The form which 33 stood up is comprised.

  FIG. 5 shows the second support member 40 and the second ring member 50 constituting the second member 12 in an unfolded state. FIG. 6 shows a state in which the second ring member 50 is attached to the second support member 40. The second support member 40 is a plastic cylindrical member that extends from the main body 7b of the second holder 7 made entirely of plastic, and includes a cylindrical inner peripheral surface 41. The inner peripheral surface is the first peripheral surface. 2 is a main body support surface 41. The tip 45 on the opposite side of the base end 42 where the second main body support surface 41 connects to the main body 7 b has a second stepped shape 43, and a groove that falls vertically with respect to the second main body support surface 41. A side surface 44 is formed. A groove bottom face 46 is formed at the tip 45 of the second main body support surface 41 through the groove side face 44 at a position where it falls with respect to the second main body support surface 41. In the second member 12, the groove side surface 44 falls to the radially outer side (outer peripheral side) of the second main body support surface 41, and the groove bottom surface at a position where the second main body support surface 41 falls in the outer peripheral direction. 46 is formed.

  The further tip 46 a of the groove bottom surface 46 further has a third stepped shape 47, and a second ring support surface 48 that falls perpendicularly to the groove bottom surface 46 is formed. A ring receiving surface 49 is formed on the tip end 46 a side of the groove bottom surface 46 via the second ring support surface 48 at a position where it falls with respect to the groove bottom surface 46. In the second member 12, the second ring support surface 48 falls radially outward (outer peripheral side) with respect to the groove bottom surface 46, and the ring receiving surface 49 is radially outward with respect to the groove bottom surface 46. It is formed at a position that falls on the (outer peripheral side). The groove bottom surface 46 is wider than the thickness t1 of the first bayonet claw 33, and the ring receiving surface 49 has at least the same width as the thickness t2 of the second ring member 50.

  The second ring member 50 of the second member 12 includes an outer peripheral surface 51 that contacts the ring receiving surface 49. The outer diameter of the second ring member 50 is equal to the inner diameter of the ring receiving surface 49 of the second support member 40 within a tolerance range, and the second ring member 50 is placed at the tip of the second support member 40. The ring receiving surface 49 can be attached. Therefore, the second ring member 50 has a shape supported by the second ring support surface 48 and the ring receiving surface 49 of the third stepped shape 47. Further, the second ring member 50 includes a plurality of second bayonet claws 53 that fall vertically and intermittently from the groove bottom surface 46 when supported by the third stepped shape 47. In this example, the second bayonet claw 53 of the second ring member 50 protrudes radially inward (inner peripheral side) with respect to the groove bottom surface 46.

  On the groove side surface 44 of the second member 12, a ball 61 for pressing and locking the first bayonet claw 33 fitted in the groove (claw receiving groove) 55 against the second bayonet claw 53 appears. The ball 61 is pressed by a spring from the main body side of the second member 12.

  The second ring member 50 is fixed to the second ring support surface 48 of the second support member 40 with a plurality of screws 59. When the second ring member 50 is attached to the ring support surface 48 of the second support member 40, as shown in FIG. 6, the second bayonet claw 53 and the groove bottom surface 46 are formed on the distal end side of the second member 12. And the groove | channel (receiving groove | channel) 55 for receiving the 1st bayonet nail | claw 33 is intermittently formed in the inner peripheral direction by the groove | channel side surface 44. FIG.

  For this reason, the first bayonet claw 33 of the first member 11 is placed on the distal end side of the second member 12 and the first member 11 and the second member 12 are rotated relatively to each other. The first member 11 and the second member 12 can be fixed by meshing the bayonet claws 33 and the second bayonet claws 53. That is, the first holder 6 provided with the first member 11 and the second holder 7 provided with the second member 12 can be fixed. Moreover, by rotating the 1st member 11 and the 2nd member 12 relatively, the meshing of the 1st bayonet claw 33 and the 2nd bayonet claw 53 is released, and the 1st member 11 and the 2nd The member 12 can be disassembled. That is, the first holder 6 including the first member 11 and the second holder 7 including the second member 12 can be disassembled.

  FIG. 7 shows a state in which the first member 11 in which the first ring member 30 is attached to the first support member 20 is viewed from the distal end side. FIG. 8 shows a state in which the second member 12 in which the second ring member 50 is attached to the second support member 40 is viewed from the distal end side. FIG. 9 shows a state in which the wall body 40a constituting the groove side surface 44 of the second support member 40 is viewed from the back surface 44r.

  In this example, the first ring member 30 includes three first bayonet claws 33 at a pitch of 120 degrees. The second ring member 50 is also provided with three second bayonet claws 53 at a pitch of 120 degrees. Accordingly, by rotating the front end of the first member 11 and the front end of the second member 12 by 60 degrees, the first bayonet mount 10 including the first member 11 and the second member 12 causes the first member 11 and the second member 12 to rotate. The holder 6 and the second holder 7 can be attached and detached.

  As shown in FIG. 9, a hole 62 through which a metal ball 61 passes is formed in the wall body 40a. A leaf spring 65 for pressing the ball 61 is attached to the back surface 44r, and the ball 61 is pressed in a direction protruding from the groove side surface 44. The pressure mechanisms 60 including the balls 61 and the leaf springs 65 are respectively disposed at positions corresponding to the three second bayonet claws 53 when the second ring member 50 is attached.

  In addition, a pressurizing mechanism 60 for locking is additionally arranged at a position corresponding to one second bayonet claw 53. The ball 61 of the locking pressurizing mechanism 60 is disposed so as to protrude from the groove side surface 44 at a position where the ball 61 fits into the groove 35 of the first bayonet claw 33. Therefore, when the first member 11 and the second member 12 are relatively rotated and the first bayonet claw 33 is placed in a predetermined position, the locking ball 61 is inserted into the groove 35 of the first bayonet claw 33. The first member 11 and the second member 12 are prevented from inadvertently rotating and coming off. On the other hand, since the ball 61 is a spherical surface, when a predetermined force is applied to relatively rotate the first member 11 and the second member 12, the ball 61 comes out of the groove 35 of the first bayonet claw 33. Therefore, the first member 11 and the second member 12 can be rotated and detached.

  FIGS. 10 to 12 show how the first member 11 and the second member 12 are attached and detached by the bayonet mount 10 including the first member 11 and the second member 12. The first member 11 is also called a male member (male side), and the second member 12 is also called a female member (female side). First, as shown in FIG. 10, the first member 11 and the second member 12 are combined so that the first bayonet claw 33 and the second bayonet claw 53 do not interfere with each other.

  In the first member 11 on the male side, the first ring member 30 is moved in two directions by the first step 23 of the first support member 20, that is, the first main body support surface 21 and the first ring support. And is supported by a surface 24. In particular, the first ring support surface 24 is a surface that extends along the plate-like first ring member 30, transmits a load applied to the first ring member 30 to the first support member 20, and One ring member 30 is reinforced (to ensure the strength or rigidity of the first ring member 30). Moreover, since the 1st main body support surface 21 is extended so that the 2nd main body support surface 41 may be fitted so that it may mention later, the width | variety is fully wider than the thickness t1 of the 1st ring member 30. FIG. Therefore, even if the first ring member 30 has a simple plate-like structure, the strength required as a part of the bayonet mount 10 can be maintained.

  In the second member 12 on the female side, the second ring member 50 is moved in two directions by the third step 47 of the second support member 40, that is, the ring receiving surface 49 and the second ring support surface 48. And is supported by. The second ring support surface 48 is a surface that extends along the plate-like second ring member 50, and transmits a load applied to the second ring member 50 to the second support member 40, thereby The ring member 50 is reinforced (to ensure the strength or rigidity of the second ring member 50). The ring receiving surface 49 is formed to have the same width as the thickness t2 of the second ring member 50 or a width wider than the thickness t2. Therefore, even if the second ring member 50 has a simple plate-like structure, the strength required as a part of the bayonet mount 10 can be maintained.

  As shown in FIG. 11, the bayonet mount 10 includes the first member 11 and the second member 12, the groove side surface 44 of the second support member 40, the groove bottom surface 46, and the second ring member 50. The first bayonet claws 33 of the first ring member 30 are combined in a groove (claw receiving groove) 55 formed by the two bayonet claws 53. At this time, the first body support surface 21 of the first support member 20 is in contact with the second body support surface 41 of the second support member 40, and the first support member 20, the second support member 40, Fit together. In this bayonet mount 10, the first main body support surface 21 is an outer surface of a cylinder, the second main body support surface 41 is an inner surface of a cylinder, and the load supported by the bayonet mount 10 is basically these main body support surfaces. 21 and 41. That is, the load of the second member 12 and further the second unit 7 connected to the second member 12 is transferred from the second support member 40 to the first support member 20 via the main body support surfaces 41 and 21. And to the first unit 6. It may be a case where a load is transmitted from the first unit 6 to the second unit 7.

  In the bayonet mount 10, when the first member 11 and the second member 12 are relatively rotated, the first bayonet claw 33 entering the groove 55 faces the second bayonet claw 53 as shown in FIG. The first bayonet claw 33 is pressed against the second bayonet claw 53 by the pressurized ball 61. Therefore, the first support member 20 of the first member 11 is not pulled out from the second support member 40 of the second member 12, and the bayonet mount 10 can be prevented from being released. In FIG. 12, the first bayonet claw 33 is pressurized by a leaf spring 65 and a coil spring 65 a.

  As described above, in the bayonet mount 10, the first support member 20 of the first member 11 and the second support member 40 of the second member 12 are fitted to each other, and the first main body support surface 21 and the second support member 40 are fitted. The two main body support surfaces 41 are in contact with each other so that the load applied to the bayonet mount 10 can be supported. For this reason, in this bayonet mount 10, the first ring member 30 and the second ring member 50 do not support a load but have a structure that mainly functions to prevent the support members 20 and 40 from coming off. Yes, a metal flat ring is sufficient in strength. Further, since the metal bayonet claws 33 and 53 are pressed against each other by the ball 61 which is a pressure member, the portion subjected to pressure friction when the bayonet mount 10 is attached / detached is metal, and wear due to pressure friction. Can be prevented. Such metal plate-like ring members 30 and 50 can be mass-produced at low cost by press sheet metal working.

  On the other hand, the first support member 20 and the second support member 40 that support the load of the main body are basically a cylinder or a column, and are provided with several step structures for mounting the ring members 30 and 50. Just a simple cylindrical shape. In addition, since the load is transmitted between the inner surface of the cylinder and the outer surface of the column, it is desirable that each of the support members 20 and 40 has a certain amount of volume and a high compressive strength. Therefore, the first support member 20 and the second support member 40 are suitable for manufacturing by plastic molding. Therefore, the first support member 20 and the second support member 40 can also be mass-produced at low cost by the resin molded by the mold. Then, the first ring member 30 is fixed to the first support member 20 with screws or the like, and the second ring member 50 is fixed to the second support member 40 with screws or the like, whereby the bayonet mount 10 is fixed. The 1st member 11 and the 2nd member 12 which comprise can be provided. For this reason, the bayonet mount 10 of this example can be provided at low cost, and the load (load) that can be supported is sufficiently large and the durability is sufficiently high.

  FIG. 13 and FIG. 14 show different examples of the bayonet mount. The bayonet mount 80 also includes a first member 11 and a second member 12. Unlike the bayonet mount 10 described above, the first main body support surface 21 of the first support member 20 of the first member 11 is a cylindrical inner surface, and the second support member 40 of the second member 12 The second main body support surface 41 is a cylindrical outer surface. That is, the first member 11 includes the first support member 20 whose inner peripheral surface is the first main body support surface 21. Accordingly, the first ring support surface 24 formed by the first step 23 rises radially inward of the first main body support surface 21. Further, the first ring member 30 has a shape that is mounted in a cylinder, and the first bayonet claw 33 protrudes inward in the radial direction.

  On the other hand, the second member 12 includes a cylindrical (columnar) second support member 40 whose outer peripheral surface is the second main body support surface 41. Therefore, the second step 43 is formed so that the groove side surface 44 of the second support member 40 falls inward in the radial direction of the second main body support surface 41, and the second ring support surface 48 corresponds to the groove bottom surface 46. A third step 47 is formed so as to fall inward in the radial direction. The second ring member 50 is shaped to be attached to a cylindrical member whose outer peripheral surface is a ring receiving surface 49, and the second bayonet claw 53 protrudes outward in the radial direction.

  This bayonet mount 80 is different from the bayonet mount 10 described above except for the difference in structure related to the first support member 20 being cylindrical and the second support member 40 being cylindrical. The functions and attachment / detachment methods of each surface are the same as those of the bayonet mount 10 described above. Therefore, also in this bayonet mount 80, the ring members 30 and 50 may be plate-shaped metal rings, and can be easily manufactured by press working. Further, the first support member 20 and the second support member 40 may be simple plastic members having a cylindrical shape, and can be easily manufactured by molding. Further, the bayonet mount 80 is also sufficiently durable because the metal rings 30 and 50 are subjected to pressure friction and the plastic support members 20 and 40 are not subject to pressure friction. ), There is little deterioration in the accuracy of fitting.

  In the above description, the projector is described as an example of the optical device using the bayonet mount 10 or 80. However, the optical device may be a camera including an imaging device. The bayonet mount may be used for a part for assembling the lens holder divided into two parts, or may be used for a part for attaching the lens holder to the camera body. Furthermore, the bayonet mounts 10 and 80 are not limited to optical devices, and can be applied to various devices as long as they include devices that rotate and detach components.

Sectional drawing which shows schematic structure of the optical apparatus using a bayonet mount. Sectional drawing which shows the state which decomposed | disassembled the lens holder. The figure which expand | deploys and shows the 1st support member and 1st ring member of the 1st member of a bayonet mount. The perspective view which shows the state which attached the 1st ring member to the 1st support member. The figure which expand | deploys and shows the 2nd support member and 2nd ring member of the 2nd member of a bayonet mount. The perspective view which shows the state which attached the 2nd ring member to the 2nd supporting member. The figure which looked at the 1st member from the tip. The figure which looked at the 2nd member from the tip. The figure which shows the structure of the back side of the groove | channel side surface of a 2nd supporting member. It is sectional drawing which shows the detailed structure of a bayonet mount, and is sectional drawing which shows the state before meshing bayonet nail | claws. Sectional drawing which shows the state which put the bayonet nail | claw in the groove | channel. Sectional drawing which shows the state which rotated the bayonet mount and meshed the bayonet claws. Sectional drawing which shows the state which mesh | engaged the bayonet nail | claw of a different bayonet mount. Sectional drawing which shows the state before meshing the bayonet claws of the bayonet mount shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical apparatus, 5 Lens holder 10, 80 Bayonet mount, 11 1st member, 12 2nd member 20 1st support member made from plastic, 21 1st main body support surface 30 1st metal ring member 33 First bayonet claw 40 Plastic second support member 41 Second body support surface 50 Metal second ring member 53 Second bayonet claw

Claims (5)

A bayonet mount having a first member and a second member that can be attached and detached by rotating,
The first member includes a first support member made of plastic,
The first support member includes a cylindrical first body support surface;
A first step shape forming a first ring support surface rising perpendicular to the first body support surface at a base end of the first body support surface;
Furthermore, the first member is made of metal attached to the first support member so as to be supported by the first ring support surface and the first main body support surface of the first step shape. A plate-shaped first ring member;
The first ring member includes a plurality of first bayonet claws vertically rising from the first main body support surface,
The second member includes a second support member made of plastic,
The second support member is cylindrical and has a second body support surface in contact with the first body support surface;
In order to form a groove bottom surface having a width wider than the thickness of the first bayonet claw at the tip of the second main body support surface at a position where the second main body support surface falls. A second step shape forming a groove side surface falling in the vertical direction with respect to the main body support surface of 2;
In order to form a ring receiving surface at the tip of the groove bottom surface at a position falling with respect to the groove bottom surface, a third ring support surface falling perpendicularly to the groove bottom surface is formed. Including a step shape,
Further, the second member is a metal plate-like plate attached to the second support member so as to be supported by the second ring support surface and the ring receiving surface of the third step shape. A second ring member;
The second ring member includes a plurality of second bayonet claws vertically rising from the groove bottom surface, and the width of the ring receiving surface is at least the same as the thickness of the second ring member;
Further, the second member is configured to press the first bayonet claw that has entered a receiving groove formed by the groove bottom surface, the groove side surface, and the second bayonet claw against the second bayonet claw. Bayonet mount with pressure means protruding from the side of the groove. In claim 1,
The first member includes the cylindrical first support member whose outer peripheral surface is the first main body support surface, and the first ring support surface is a radial direction of the first main body support surface. Rising to the outside, the first bayonet claws projecting radially outward,
The second member includes the second support member having an inner peripheral surface serving as the second main body support surface, and the groove side surface falls radially outward of the second main body support surface, The bayonet mount, wherein the second ring support surface falls radially outward from the groove bottom surface, and the second bayonet pawl protrudes radially inward. In claim 1,
The first member includes the first support member having an inner peripheral surface serving as the first main body support surface, and the first ring support surface is located radially inward of the first main body support surface. Standing up, the first bayonet claw protruding radially inward,
The second member includes the cylindrical second support member having an outer peripheral surface serving as the second main body support surface, and the groove side surface falls radially inward of the second main body support surface. The bayonet mount, wherein the second ring support surface rises radially inward of the groove bottom surface, and the second bayonet pawl protrudes radially outward. In any of claims 1 to 3,
The pressurizing means includes a bayonet mount including a ball member provided to be exposed from the groove side surface and a spring member for pressurizing the ball member to be exposed from the groove side surface. An optical apparatus having a first optical component and a second optical component,
The first optical component includes one of the first member and the second member according to any one of claims 1 to 4, and a lens.
The second optical component is an optical apparatus including the other of the first member and the second member, a lens, an imaging device, and / or an image generation device.

Images