JP2015114418A - Imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device that includes a lens mount, in which a mounting securement is hard to come off even when external force is unexpectedly applied.SOLUTION: A lens mount of this imaging device is a lens mount provided in an imaging device 200, and the lens mount comprises: a stationary part 210; a securement mount part 220 that is secured to the stationary part 210; an arm part 13 that fits into a fitting part 342 provided in the imaging device 200; pawl parts 242 to 244 that fit into bayonet pawl parts 112 to 114; and a movable mount part 240 that is rotatable centering around an optical axis of a lens barrel 100. When the arm part 13 is present at a first position, the lens barrel 100 is unmountable/mountable, and when the arm part 13 is present at a second position, the bayonet pawl parts 112 to 114 and the pawl parts 242 to 244 fit into each other, and the arm part 13 and the fitting part 342 fit into each other, thereby the lens barrel 100 is secured to the imaging device 200.

Description

  The present invention relates to an imaging apparatus, and more particularly, to a lens mount structure of an imaging apparatus capable of exchanging lenses.

  Conventionally, imaging with a built-in image sensor that changes the lens so that it can shoot wide / narrow field of view, deep / shallow depth of field, macro, etc. depending on the situation A device has been proposed. Examples of a lens mount system in which a lens can be attached to and detached from the imaging apparatus main body include a screw type lens mount and a bayonet type lens mount.

  In the screw-type lens mount, the claw shape and the mount surface on the interchangeable lens side provided in a part thereof are brought into contact with the mount surface on the image pickup apparatus side where the distance to the image pickup element is adjusted. Then, the arm portion provided in the image pickup apparatus main body is rotated, and this claw shape of the interchangeable lens is pressed against the mount surface by another component on the image pickup apparatus side, thereby fixing the interchangeable lens.

  On the other hand, in the bayonet type lens mount, the mount surface of the mount portion of the interchangeable lens having the claw shape at the tip is brought into contact with the mount surface having the claw shape whose distance to the image sensor is adjusted, and the interchangeable lens is rotated. When the mutual nail shapes are fitted, the interchangeable lens is moved to the image sensor side by a spring member that urges the nail shape of the interchangeable lens incorporated in the image sensor to the image sensor side inside the image sensor. This is a method of holding the interchangeable lens.

  In Patent Literature 1, in a screw-type lens mount, there is a method in which an interchangeable lens is fixed by contacting the mount surface of the interchangeable lens and the mount surface on the imaging device side, the claw shape of the interchangeable lens and the claw shape on the imaging device side. It is disclosed. As shown in FIG. 12, the imaging device main body includes a stopper member 60 supported so as to be movable up and down in the radial direction of the mount, and is screwed and connected to a screw hole 16 formed in the shaft portion of the stopper member 60. After the lens is connected to the mount on the lens barrel receiving seat 14 via the screw portion 15, the stopper member 60 is lowered along the screw hole 16. Then, the claw 74 is sandwiched between the end surface of the lens barrel receiving seat 14 and the inner end surface of the screw hole 16, and the end surface of the stopper member comes into contact with the contact surface 76 provided in the lens portion. Thereby, even when an external force is applied unexpectedly, it is possible to prevent the mount fixing from being released due to the frictional force of the stopper member 60.

Japanese Patent No. 0335790

  However, in the conventional screw-type lens mount, the arm part protrudes outward from the imaging device main body so that the operator can easily operate it, and the arm part comes into contact with an obstacle or is fixed by malfunction. May loosen. For this reason, in the conventional screw-type lens mount, fixation by an arm part becomes loose and there exists a possibility that an interchangeable lens may fall off easily.

  Moreover, when fixing by screwing like patent document 1, the adjustment which unites the lens barrel receiving seat 14 provided in the lens part is needed, and the man-hour of mounting | wearing of a lens increases. Furthermore, when an interchangeable lens other than a lens that supports screwing is used, the original function may not be exhibited or the lens may be damaged.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide an imaging apparatus in which the mount is not easily detached even when an external force is applied unexpectedly.

  In order to solve the above-described problem, the lens mount of the present invention is a lens mount provided in the imaging apparatus for attaching and detaching a lens barrel having a bayonet claw part to the imaging apparatus, the fixing unit; A fixed mount portion that is fixed to the fixed portion and has a mount surface that contacts the mount portion of the lens barrel, an arm portion that engages with an engagement portion provided in the imaging device, and an engagement with the bayonet claw portion A movable mount portion that is rotatable about the optical axis of the lens barrel, wherein the movable mount portion is rotated and the arm portion is in the first position. When the lens barrel is detachable and the arm portion is in the second position, the bayonet claw portion and the claw portion are engaged, and the arm portion and the engagement portion are engaged. The lens barrel is Characterized in that it is fixed to the apparatus.

  According to the present invention, it is possible to provide an imaging apparatus in which mounting of a mount is difficult to be released when an external force is unexpectedly applied, and the reliability of mounting is improved.

It is a perspective view which shows the state which mounted | wore the interchangeable lens with the imaging device. It is the perspective view (A) which looked at the interchangeable lens from back, and the perspective view (B) which looked at the bayonet claw part of the interchangeable lens from the lens front. They are the front exploded perspective view (A) which showed the principal part of the lens mount, the back exploded perspective view (B) which showed the principal part of the lens mount, and the perspective view (C) which showed the movable mount of the lens mount. It is the front view which showed the operation | movement of the element of the lens mount sequentially. It is sectional drawing of the cross section AA, BB, CC shown in FIG. It is a figure which shows the detail of D, E, and F shown in FIG. It is a disassembled perspective view which shows the whole lens mount. It is a disassembled perspective view of an operation part. It is a figure which shows the operation | movement which attaches / detaches an interchangeable lens. It is a front view which shows sequentially the operation | movement of the whole lens mount. It is a side view which shows the state which the finger engaging part and the engaging part of the main body engaged. It is a figure which shows the conventional lens mount structure.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view illustrating a state in which an interchangeable lens (lens barrel) 100 is mounted on an imaging apparatus 200 including a lens mount according to the present embodiment. As shown in FIG. 1, when the interchangeable lens 100 is attached to the imaging apparatus 200 including the lens mount according to the present embodiment, the engagement structure of the operation unit (arm unit) 13 and the engagement unit 342 are engaged. It is configured to be able to combine.

  2A is a perspective view of the interchangeable lens 100 alone, and FIG. 2B is a perspective view of the bayonet claw portions 112 to 114 of the interchangeable lens 100. FIG. FIG. 3A is an exploded perspective view showing the main part of the lens mount according to the present embodiment as viewed from the front side of the imaging apparatus. FIG. 3B is an exploded perspective view showing the main part of the lens mount according to the present embodiment as viewed from the back side of the imaging apparatus. FIG. 3C is a perspective view in which only the movable mount 240 of the lens mount according to the present embodiment is taken out. 3A and 3B, the interchangeable lens 100 shows only the mount part 110 for the sake of simplicity.

  In FIG. 2, the interchangeable lens 100 according to the present embodiment includes a cylindrical column whose diameter changes in the longitudinal direction as a whole and an optical system accommodated in the barrel. In FIG. 2A, the optical axis of the optical system is indicated by a one-dot chain line. The interchangeable lens 100 according to the present embodiment includes a fixed barrel 101, a focus ring 102, and a slide switch 103.

  The fixed barrel 101 has an optical system disposed therein and does not rotate. In order to change the focal length of the interchangeable lens 100, the focus ring 102 is rotated. By sliding the slide switch 103, the focus function of the interchangeable lens 100 can be switched between automatic and manual.

  In this embodiment, the interchangeable lens 100 is provided with only one slide switch 103. However, the present invention is not limited to this configuration. For example, a plurality of slide switches having functions other than automatic and manual switching are provided. It may be a configuration. An insertion index 104 is provided near the rear end of the peripheral surface of the interchangeable lens 100. When the interchangeable lens 100 is attached to the imaging apparatus 200, the insertion index 104 is provided so that it can be easily aligned with an index (not shown) provided on the imaging apparatus 200 side.

  In the interchangeable lens 100, a mount surface 111, bayonet claws 112 to 114, and a communication contact 105 are disposed on the end surface on the imaging device 200 side. A plurality of communication contacts 105 protrude from the mount surface 111 of the interchangeable lens 100 toward the imaging device 200 and are arranged so as to match the respective contacts of the arc-shaped electrical communication contact portion 380 provided in the imaging device 200. The mount surface 111 is an annular surface that is orthogonal to the optical axis of the optical system of the interchangeable lens 100 and has the optical axis as the center. By bringing the mount surface 111 into contact with the mount surface 221 of the imaging apparatus 200, the optical system of the interchangeable lens 100 is accurately positioned on the imaging apparatus 200.

  A plurality of bayonet claws 112 to 114 are arranged at substantially the rear end where the interchangeable lens 100 has the smallest diameter. The bayonet claw portions 112 to 114 each have an arc shape and are fixed to the fixed barrel 101. Bayonet claw contact surfaces 112 a to 114 a are provided on the back side of the bayonet claw portions 112 to 114 of the interchangeable lens 100. The bayonet claw contact surfaces 112a to 114a are arranged as contact surfaces for making contact with the contact surfaces 242a to 244a of the movable mount portion 240 of the imaging apparatus 200 when the interchangeable lens 100 is fixed.

  The fixing part 210 is, for example, a metal die-cast member, and has fastening parts 211 a to 211 d for fixing the fixing mount part 220. The fixed mount part 220 includes a mount surface 221, an opening 222, a female screw part 223, holes 224 a to 224 d, a first contact surface 231, and a second contact surface 232.

  The mount surface 221 contacts the mount surface 111 of the interchangeable lens 100. The opening 222 is inserted through the bayonet claws 112 to 114 of the interchangeable lens 100. The female screw portion 223 is disposed on the inner wall of the opening 222 around the optical axis. The screws inserted through the hole portions 224a to 224d are fastened to the fastening portions 211a to 211d, and the fixed mount portion 220 is fixed to the fixed portion 210.

  The movable mount part 240 has a male screw part 241, claw parts 242 to 244, and fastening parts 245 to 248. The claw portions 242 to 244 have claw contact surfaces 242 a to 244 a that come into contact with the bayonet claw contact surfaces 112 a to 114 a of the interchangeable lens 100. The male screw portion 241 is disposed on the outer periphery of the movable mount portion 240 and is engaged with the female screw portion 223. The first arm portion 260a has a first contact surface 265, a second contact surface 266, and first and second hole portions 264a, b.

  The second arm portion 260b has a third contact surface 267, a fourth contact surface 268, and third and fourth holes 264c, d. The first and second arm portions 260a and 260b are brought into contact with the movable mount portion 240 in a region sandwiched between the fixed portion 210 and the fixed mount portion 220. The screws inserted through the first to fourth holes 264a to 264d are fastened to the fastening parts 245 to 248, and the first and second arm parts 260a and 260b are fixed to the movable mount part 240.

  A method of fixing the interchangeable lens 100 to the imaging device 200 using the above configuration will be described. FIG. 4 is a front view sequentially illustrating the operation of the elements of the lens mount when the interchangeable lens 100 according to the present embodiment is fastened to the imaging device 200.

  FIG. 4A shows an interchangeable lens detachable position where the bayonet claw portions 112 to 114 of the interchangeable lens 100 and the claw portions 242 to 244 of the movable mount do not overlap in the optical axis projection. FIG. 4B shows that the movable mount 240 is rotated counterclockwise with respect to the fixed mount 220 around the optical axis as viewed from the front of the imaging device 200. -114 and the nail | claw parts 242-244 show the state on which the optical axis projection overlapped. 4C shows that the interchangeable lens 100 is fastened to the imaging device 200 by rotating the movable mount 240 until the nail contact surfaces 242a to 244a and the bayonet nail contact surfaces 112a to 114a come into contact with each other. Indicates the state.

  With reference to FIG. 5 and FIG. 6, the detail of the cross section AA of FIG. 4, BB, CC, D, E, and F is demonstrated. In the present embodiment, the distance from the mount surface 111 of the interchangeable lens 100 to the bayonet claw contact surface 112a is a distance 150. The distance between the mount surface 221 of the fixed mount 220 and the claw contact surface 242a of the movable mount 240 is a distance 250.

  5A shows that the bayonet claw portions 112 to 114 of the interchangeable lens 100 are inserted into the opening 222 of the fixed mount portion 220 so that the mount surface 111 of the interchangeable lens 100 and the mount surface 221 of the imaging device 200 are in contact with each other. It is a figure which shows the state made to contact. FIG. 6A is a detailed front view of the state. This shows a state where the interchangeable lens 100 is dropped into the imaging device 200. At this time, the electrical communication contact part 105 of the interchangeable lens 100 and the electrical communication contact part 380 of the main body of the imaging device 200 are in contact with each other.

  Since the female screw part 223 and the male screw part 241 are screwed together, the claw parts 242 to 244 move to the fixing part 210 side along the optical axis direction simultaneously with the rotation. When the movable mount portion 240 rotates with respect to the fixed portion 210 from the state of FIG. 5A, as shown in FIG. 5B, the bayonet claws 112 to 114 of the interchangeable lens 100 are movable. The claw parts 242 to 244 of the mount 240 approach. FIG. 6B is a detailed front view of the state. Eventually, as shown in FIG. 5C, the distance 150 and the distance 250 are equal. FIG. 6C is a detailed front view of the state. In this state, the bayonet claw contact surface 112a of the bayonet claw 112 of the interchangeable lens 100 and the claw contact surface 242a of the movable portion 240 are in contact with each other, and the mount is fixed.

  Note that the male screw portion 241 and the female screw portion 223 in the present embodiment are left-handed screws, screws with a screw feed amount of 2 mm, and screw pitches of 1 mm. The male screw portion 241 and the female screw portion 223 are a left-hand screw if the mounting rotation direction of the interchangeable lens 100 of the existing bayonet-type lens mount is clockwise with respect to the imaging device 200, and a right-hand screw if it is counterclockwise. Become. Further, the larger the screw feed amount, the larger the movement distance in the optical axis direction can be obtained with a smaller amount of rotation operation. That is, as the screw feed amount is increased, the movement amount of the distance 250 with respect to the rotation operation amount is increased. For example, even if the distance 150 varies due to individual differences in the mount portion 110, the distance exceeding this variation can be moved with a small amount of rotational operation, so that the interchangeable lens 100 can be securely fastened. Conversely, the smaller the screw feed amount, the higher the tightening axial force. That is, when the fastening force is increased, the screw feed amount must be reduced, and therefore the screw feed amount must be appropriately selected.

  Further, as the number of screw threads to be screwed is increased, the stress concentration on the male screw portion 241 and the female screw portion 223 is dispersed. For this reason, in order to increase the number of screw threads to be screwed in a narrow space and to satisfy the screw feed amount satisfying the reliable fastening and the large tightening axial force, the screw pitch is small and the screw feed amount is small. Large multi-threaded screws are desirable. Sliding grease is applied between the male screw portion 241 and the female screw portion 223 in the present embodiment. Thereby, it becomes possible to suppress the roughness at the time of rotation which a thread part rubs, and to improve durability performance and a sliding feeling.

  Hereinafter, the entire lens mount in which a functional unit is added to the main part of the lens mount according to the present embodiment will be described. FIG. 7A is an exploded perspective view showing the entire lens mount according to the present embodiment as viewed from the front side of the imaging apparatus. FIG. 7B is an exploded perspective view showing the main part of the lens mount according to the present embodiment as seen from the back side of the imaging apparatus.

  The lens mount includes a mount portion 110, a fixed portion 210, a fixed mount portion 220, a movable mount portion 240, arm portions 260a and b, an image sensor unit 310, a ring portion 320, and a second fixed portion 340. And the operation unit 13. Further, the interchangeable lens 100 includes an electrical communication contact unit 105, an electrical communication contact unit 380 of the imaging device 200, and a rotation detection unit 370.

  The image sensor unit 310 includes an image sensor 311, a substrate 312 on which the image sensor 311 is mounted, a plate member 313 that holds the substrate 312, and holes 314 a to 314 c. The image sensor 311 converts light that has entered from the interchangeable lens 100 into a video signal. The image sensor 311 is mounted on the substrate 312. The plate material 313 holds the substrate 312. The screws inserted through the hole portions 314a to 314c are fastened to the fastening portions 212a to 212c to fix the image sensor unit 310 to the fixing portion 210. At the time of fastening, a not-shown washer having an arbitrary thickness is sandwiched between the plate material 313 and the fixed portion 210, so that the distance between the imaging element 311 and the mount surface 221 of the fixed mount portion 220 (flange back). Adjust the amount.

  The ring part 320 includes an opening 321, an annular convex part 322, a notched annular convex part 323, and holes 326 a to 326 d. The opening portion 321 is slidably engaged with the cylindrical portion 225 of the fixed mount portion 220 with a clearance fit, and is arranged to be rotatable with respect to the fixed mount portion 220. Since the clearance is related to the size of the fit, the gap between the ring part 320 and the fixed mount part 220 is small, so it has a drip-proof / dust-proof / light-blocking function to prevent water, dust and light from entering from here. . Further, by applying a sliding grease (not shown) to the gap of the sliding engagement, the slidability is improved and the gap is filled with the grease, so that the drip-proof / dust-proof function can be enhanced.

  The annular convex portion 322 is disposed on the outer periphery of the fixed mount portion 220. The notched annular convex portion 323 is disposed at a position facing the annular concave portion 226 provided in the entire outer periphery of the fixed mount portion 220. The holes 326a to 326d are fastened to the fastening portions 261a to 261d provided in the arm portions 260a and 260b and tapped by screws.

  Next, the operation unit 13 will be described with reference to FIG. The operation unit 13 includes a hinge mechanism 81 that rotates the operation unit 13, a first cover member 82 that covers the hinge mechanism 81, a second cover member 83, and a third cover member 84. The first cover member 82 has holes 82 a and 82 b and is positioned with respect to the hinge mechanism 81.

  The hole portions 82a and 82b of the first cover member 82 are present at positions corresponding to the hole portions 811a and 811b existing in the base portion 811 of the hinge mechanism 81, respectively. The second cover member 83 has a screw seat (not shown). In addition, it has an engaging portion 831 engaged with the engaging portion 342 of the imaging device 200 main body.

  The third cover member 84 has a tap hole (not shown). In addition, it has an engaging portion 841 engaged with the engaging portion 342 of the imaging device 200 main body. The engaging portions 831 and 841 have the same shape, and function as one engaging portion when integrated as the operation portion 13. The second cover member 83 and the third cover member 84 are positioned with respect to the rotating portion 814 of the hinge mechanism 81. Then, it fixes to the rotation part 814 by screwing so that the hole 814a provided in the rotation part 814 may be penetrated.

  After positioning the first cover member 82 on the hinge mechanism 81, screws are inserted into the holes 82a and 811a and the holes 82b and 811b, and are fastened to the fastening parts 261a and b of the arm parts 260a and b. Thus, the operation unit 13 is fixed to the arm portions 260a and 260b. The hinge mechanism 81 is a rotation mechanism, and rotates in a direction shown in the drawing with a rotation shaft 85 as a rotation center with respect to a base portion 811 made of sheet metal such as SUS, a shaft member 812 for fixing components, and the base portion 811. And a pivotable portion 814 that can move. Further, the hinge mechanism 81 includes a leaf spring portion 813 that generates a resistance force in the rotational direction between the base portion 811 and the rotating portion 814, and a fixing member 815. The rotating portion 814 is fixed by a fixing member 815 in a state where the leaf spring portion 813 is compressed so that the leaf spring portion 813 generates a predetermined resistance force, and the direction of the rotation shaft 85 is fixed by caulking or the like. .

  The rotational torque generated by the leaf spring portion 813 is large with respect to the force required for the rotational operation of the movable mount 240. After the movable mount 240 is tightened, the rotational torque is rotated about the rotation shaft 85 with a predetermined force or more. As a result, the operating portion 13 engages with the engaging portion 342. Since the rotational torque of the operation unit 13 is large with respect to the force required for the rotation operation of the movable mount 240, by placing a finger on the operation unit 13 and applying the force in the rotation direction of the rotation mount unit 240, The movable mount 240 can be turned.

  Further, after fixing the movable mount 240, by applying a rotational force exceeding the resistance force of the leaf spring portion 813, the rotating portion 814 covered with the second cover members 83 and 84 with respect to the rotating shaft 85. Can be rotated. In this embodiment, each part of the hinge mechanism 81 is made of a metal member such as SUS and iron, the first cover member 82, the second cover member 83, and the third cover member 84 are, for example, a resin member such as a PC. Is adopted. However, the present invention is not limited to these, and other materials may be adopted as long as the functions of the present embodiment are satisfied.

  The second fixing portion 340 includes an annular recess 226, a second cover member 83, an engagement portion 342 engaged with the engagement portions 831 and 841 of the third cover portion 84, a finger placement portion 343, Holes 344a to 344d that can be inserted. The engaging portion 342 is mounted when the interchangeable lens 100 is attached to the imaging apparatus 200 according to the present embodiment, the mount portion is operated to fix the lens, and the operating portion 13 is rotated about the rotation shaft 85. The engaging portions 831 and 841 are positioned so as to engage with each other.

  The annular concave portion 226 engages with the annular convex portion 322 of the ring portion 320. Engaging with the concavo-convex shape increases the area to be engaged, and the shape of the gap to be engaged bends, so that water droplets, dust, and light are emitted from the gap between the ring part 320 and the second fixing part 340. Drip-proof, dust-proof and light-blocking functions are provided to prevent intrusion. The engaging portion 342 and the finger placement portion 343 are disposed at positions that do not interfere with the rotation locus of the operation portion 13.

  FIG. 9 shows a state where the interchangeable lens 100 is attached to and detached from the imaging apparatus 200 by the operation of the operation unit 13 according to the present embodiment. FIG. 9A shows the time of attachment, and FIG. 9B shows the time of removal. FIG. 9A shows a state in which one finger is put on the operation unit 13 and the other finger is placed on the engaging unit 342 and the interchangeable lens 100 is fastened to the imaging device 200.

  For example, when the rotation operation is performed by gripping only the operation unit 13 and the interchangeable lens 100 is fastened, the rotation operation force is also applied to the imaging device 200, and thus it is necessary to perform the rotation operation while suppressing the imaging device 200. There is. However, as shown in FIG. 9A, the thumb is put on the side surface of the engaging portion 342, and the operation portion 13 is inserted with an insertion finger and fastened. As a result, the engaging portion 342 of the second fixing portion 340 is subjected to a force opposite to the force acting on the operating portion 13 during the turning operation, so that it is not necessary to operate while suppressing the imaging device 200.

  Further, since the turning operation of the operation unit 13 is performed using the gripping force, the operability is improved as compared with the case where only the operation unit 13 is held and the rotation operation is performed. FIG. 9B shows a state in which a finger is placed on the operation unit 13 and another finger is placed on the second finger placement unit 343 to release the fastening of the interchangeable lens 100 with respect to the imaging device 200. At the time of releasing the fastening, similarly to the fastening, it is not necessary to operate while suppressing the imaging device 200. The holes 344a to 344d are fastened by screws and the first fastening portions 227a to 227d that are disposed in the fixed mount portion 220 and are tapped, and fix the second fixing portion 340 to the fixed mount portion 220.

  FIG. 10 is a front view sequentially illustrating the entire operation of the lens mount when the interchangeable lens 100 according to the present embodiment is fastened to the imaging apparatus 200. In addition, the rotation angle of the movable mount with respect to the fixed mount in each state is denoted by θ. FIG. 10A shows an interchangeable lens detachable position where the bayonet claw portions 112 to 114 of the interchangeable lens 100 and the claw portions 242 to 244 of the movable mount portion 240 do not overlap in the optical axis projection. In this state, the interchangeable lens 100 can be attached to and detached from the imaging apparatus 200. The rotation angle θa at the position where the interchangeable lens can be detached is set to 0 °. This state corresponds to the state shown in FIG.

  FIG. 10B shows a state where the operation unit 13 is rotated and the bayonet claw contact surfaces 112a to 114a and the claw contact surfaces 242a to 244a start to overlap on the optical axis projection (rotation angle θb). In this state, since the nail shapes overlap each other, the interchangeable lens 100 does not fall off the imaging device 200. This state corresponds to the state shown in FIG.

  FIG. 10C illustrates a state in which the bayonet claw contact surfaces 112a to 114a and the claw contact surfaces 242a to 244a are in contact with each other with the smallest rotation angle by rotating the operation unit 13 (rotation). Angle θc). This is the rotation angle at which both contact surfaces come into contact when the distance 150 is minimum and the distance 250 between the fixed mount portion 220 and the movable mount portion 240 at an arbitrary position is minimum due to component variations. That is, it is an angle at which the engagement amount between the contact surfaces is fastened with the minimum amount.

  FIG. 10D shows a state in which the operation unit 13 is rotated and the bayonet claw contact surfaces 112a to 114a and the claw contact surfaces 242a to 244a are in contact with each other with the largest rotation angle (rotation). Angle θd). Contrary to FIG. 10C, when the distance 150 is the maximum and the distance 250 between the fixed mount portion 220 and the movable mount portion 240 at the arbitrary position is the maximum due to component variations, both contact surfaces come into contact with each other. The rotation angle. That is, it is an angle at which the amount of engagement between the contact surfaces is fastened.

  FIG. 10E illustrates a state in which the operation unit 13 is rotated and the predetermined contact surface 232 of the fixed mount unit 220 and the contact surface 266 of the arm portion 260a are in contact with each other (rotation angle θe). This state is a state further rotated from the state shown in FIG. 6C, and the mounting portion 110 of the interchangeable lens 100, the fixed mounting portion 220 of the imaging device 200, and the movable mounting portion 240 are elastically deformed so that a fastening force is obtained. Is generated. In order to ensure that the interchangeable lens 100 can be fastened, the rotation angle θe needs to be equal to or greater than the rotation angle θd. As described above, according to the present embodiment, the interchangeable lens 100 of the bayonet type lens mount that has been conventionally used can be attached to the imaging apparatus 200 while suppressing the rattling of the lens.

  Further, when a counterclockwise rotational force is applied to the operation unit 13 in the state of FIG. 10E, the operation unit 13 rotates about the rotation shaft 85 toward the engagement unit 342. Accordingly, the engaging portion 342 provided on the second fixing portion 340, the engaging portion 831 provided on the second cover member 83, and the engaging portion 841 provided on the third cover member 84, Engage each other. In addition, although there is no problem even if there is one engagement shape with each other, as shown in FIG.

  As shown in FIG. 11, the engaging portion 342, the engaging portion 831, and the engaging portion 841 are engaged with each other, so that even when a force is unexpectedly applied in the direction in which the mount is unlocked, the engaging portion The reaction force is generated at, and the mount cannot be easily unlocked. As described above, according to the present embodiment, it is possible to improve the reliability of mount fixing.

  On the other hand, when the operator unlocks the mount, the operation unit 13 is rotated counterclockwise around the rotation shaft 85 from the state shown in FIG. What is necessary is just to rotate clockwise.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

DESCRIPTION OF SYMBOLS 13 Operation part 100 Interchangeable lens 110 Mount part 112 Bayonet claw part 113 Bayonet claw part 114 Bayonet claw part 200 Imaging device 210 Fixed part 220 Fixed mount part 221 Mount surface 240 Movable mount part 242 Claw part 243 Claw part 244 Claw part 342 Engagement Part

Claims (7)

A lens mount provided in the imaging device for attaching and detaching a lens barrel having a bayonet claw to the imaging device,
A fixed part;
A fixed mount portion fixed to the fixed portion and having a mount surface that comes into contact with the mount portion of the lens barrel;
A movable mount portion that has an arm portion that engages with an engagement portion provided in the imaging device, and a claw portion that engages with the bayonet claw portion, and is rotatable about the optical axis of the lens barrel When,
With
When the movable mount portion is rotated and the arm portion is in the first position, the lens barrel is detachable, and when the arm portion is in the second position, the bayonet claw portion and the claw A lens mount, wherein the lens barrel is fixed to the imaging device by engaging the arm part and the engaging part.
The arm portion includes an engagement structure that engages with the engagement portion, and a rotation mechanism that rotates the arm portion to engage the engagement structure with the engagement portion. The lens mount according to claim 1.
The lens mount according to claim 2, wherein the rotation mechanism includes a leaf spring so as to rotate by applying a predetermined force.
The lens mount according to claim 3, wherein the predetermined force is larger than a force necessary for a rotating operation of the movable mount portion.
The fixed mount portion has a first screw portion, and the movable mount portion has a second screw portion that is screwed with the first screw portion,
2. The lens mount according to claim 1, wherein the movable mount portion is rotated by screwing the first screw portion and the second screw portion.
The first screw portion is a female screw disposed on an inner wall of an opening provided in the fixed mount, and the second screw portion is a male screw disposed on an outer periphery of the rotating mount. The lens mount according to claim 5, which is characterized by:
An imaging device provided with the lens mount of any one of Claims 1-6.