JP2013218150A - Lens mount and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens mount that can prevent occurence of an electric communication failure between an imaging device main body and an interchangeable lens.SOLUTION: A lens mount provided in an imaging device main body 200 allows a movable mount part 240 to be rotated centering around an optical axis, allows the movable mount part 240 to be moved in an optical axis direction as a female screw part 223 of a stationary mount part 220 is being screwed to a male screw part 243 of the movable mount part 240, and allows bayonet pawl parts 112a to 112c of an interchangeable lens 100 and pawl parts 241a to 241c of the movable mount part 240 to be engaged with each other. A rotary detection part 370 detects whether or not the movable lens mount 240 is at a position capable of executing an electric communication between a lens-side contact part 180 of the interchangeable lens 100 and a main body-side contact part 380 of the imaging device main body 200, and a control part 400 controls ON/OFF of the electric communication on the basis of a detection result of the rotary detection part 370.

Description

  The present invention relates to a lens mount of an imaging apparatus capable of exchanging lenses, and more particularly to a technique for reliably performing electrical communication between an interchangeable lens and an imaging apparatus main body.

  As an image pickup device incorporating an image pickup device, a single focus lens, zoom lens, wide-angle lens, telephoto lens, macro lens, etc. so that shooting can be performed by changing the angle of view, depth of focus, F value, etc. according to the situation. 2. Description of the Related Art An imaging device capable of exchanging (hereinafter referred to as “interchangeable lens”) is known. As a lens mount for making the interchangeable lens detachable from the image pickup apparatus main body, a screw-type lens cloak and a bayonet-type lens mount are known.

  Here, some interchangeable lenses have a function of outputting lens focal length, zoom position, and aperture information as metadata to the imaging apparatus main body. In addition to such a function, there is an interchangeable lens that receives a power source for driving the lens from the main body of the imaging apparatus and controls driving of the lens. As an imaging device using such an interchangeable lens, a plurality of detection means for detecting the mounting state of the interchangeable lens are arranged in the imaging device body, and power supply to the interchangeable lens is started when the interchangeable lens is detected to be mounted Is known (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-271366

  However, not all of the electrical contacts are in reliable contact with each other when attachment of the interchangeable lens is detected. When electrical contacts that are in contact and non-contact are in contact when the interchangeable lens is receiving power, signal communication for drive control of the interchangeable lens becomes unstable, leading to poor communication. This may cause a problem in driving the interchangeable lens. Therefore, when the interchangeable lens is attached to the image pickup apparatus main body, it is necessary to securely contact the electric contact on the interchangeable lens side and the electric contact on the image pickup apparatus main body side.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a lens mount that can prevent the occurrence of poor electrical communication between an imaging apparatus main body and an interchangeable lens.

  A lens mount according to the present invention is a lens mount provided in the imaging apparatus main body for attaching / detaching an interchangeable lens to / from the imaging apparatus main body, the main body side mounting surface being in contact with the lens side mounting surface of the interchangeable lens; A fixed mount portion having a first screw portion, a claw portion engaging with a bayonet claw portion of the interchangeable lens, and a second screw portion screwed with the first screw portion. A movable mount part, a main body side telecommunications contact part electrically connected to the lens side telecommunications contact part of the interchangeable lens, and the fixed mount part are fixed, and the movable mount part is rotated about the optical axis. As a result, when the movable mount portion moves along the optical axis direction in accordance with the screwing of the first screw portion and the second screw portion, the movable mount portion is connected to the lens side telecommunication connection. Detecting means for detecting whether or not electrical communication between the main body side electrical communication contact part and the main body side electrical communication contact part is possible, and a position where the movable mount part can execute electrical communication by the detection means Control means for executing electrical communication between the lens side electrical communication contact part and the main body side electrical communication contact part.

  According to the present invention, the power supply from the imaging device body to the interchangeable lens is performed when all of the plurality of electrical contacts are reliably in contact between the imaging device body and the interchangeable lens. It is possible to prevent the occurrence of defects.

It is a front perspective view which shows the state which mounted | wore the interchangeable lens with the imaging device main body provided with the lens mount which concerns on embodiment of this invention. It is a disassembled perspective view which shows the component of the lens mount which concerns on embodiment of this invention seeing from the front side of an imaging device main body. It is a disassembled perspective view which shows the component of the lens mount which concerns on embodiment of this invention seeing from the back side of an imaging device main body. It is a perspective view which shows the detailed structure of the rotation detection part shown to Fig.2 (a). It is an exploded perspective view showing the structure of an interchangeable lens that can be attached to and detached from the lens mount according to the embodiment of the present invention. It is the perspective view which expanded a part of mount part of an interchangeable lens and was seen from the back side of the interchangeable lens. It is a front view which shows a motion of the component of a lens mount when attaching an interchangeable lens to an imaging device main body with time. It is the enlarged view of the A section in Fig.7 (a), and the enlarged view of the B section in FIG.7 (b). FIG. 8B is a cross-sectional view taken along the line CC in FIG. 7B and a cross-sectional view taken along the line DD in FIG. It is sectional drawing perpendicular | vertical with respect to the optical axis direction of E part in Fig.7 (a), and F part in FIG.7 (c). It is a block diagram which shows the control system in connection with the rotation detection part with which an imaging device main body is provided. It is a flowchart of the rotation detection process of the movable mount part with which an imaging device main body is provided at the time of attachment / detachment operation of an interchangeable lens.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Lens mount structure>
FIG. 1 is a front perspective view showing a state in which an interchangeable lens 100 is mounted on an imaging apparatus main body 200 including a lens mount according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing components of the lens mount according to the embodiment of the present invention as seen from the front side of the imaging apparatus main body 200. FIG. 3 is an exploded perspective view showing components of the lens mount according to the embodiment of the present invention as seen from the back side of the imaging apparatus main body 200.

  FIG. 4 is a perspective view showing a detailed structure of the rotation detection unit 370 shown in FIG. FIG. 5 is an exploded perspective view showing the structure of the interchangeable lens 100, FIG. 5 (a) is an exploded perspective view showing the interchangeable lens 100 as viewed from the front side, and FIG. It is a disassembled perspective view which shows seeing from the back side. FIG. 6 is a perspective view in which a part of the mount part 110 of the interchangeable lens 100 is enlarged and viewed from the back side of the interchangeable lens 100.

  The interchangeable lens 100 generally includes a mount portion 110, a lens barrel portion 170, and a lens side telecommunication contact portion 180 (hereinafter referred to as “lens side contact portion 180”). The lens mount of the imaging apparatus main body 200 is roughly composed of a fixed portion 210, a fixed mount portion 220, a movable mount portion 240, arm portions 260a and 260b, a main body side telecommunications contact portion 380 (hereinafter referred to as “main body side contact portion 380”). A ring portion 320 and a rotation detector 370.

  Although not shown, the lens barrel 170 of the interchangeable lens 100 includes a plurality of lens groups, a power source for driving the plurality of lens groups, and a control system for controlling the drive. As shown, it has fastening portions 171a, 171b, 171c, 171d. The lens side contact part 180 has a fastening part (not shown). The lens-side contact unit 180 includes a contact unit that inputs and outputs a signal using the focal length, zoom position, and aperture information of the lens as metadata, and a contact unit that receives power for driving the lens.

  As shown in FIG. 5, the mount portion 110 of the interchangeable lens 100 includes a lens-side mount surface 111, bayonet claw portions 112a, 112b, and 112c, a first through hole portion (not shown), and a second through hole. Sections 115a, 115b, 115c, and 115d. As shown in FIG. 6, the bayonet claw portions 112a to 112c have bayonet claw contact surfaces 113a, 113b, and 113c.

  The screw is inserted into the first through hole portion (not shown) of the mount portion 110 and fastened to the fastening portion (not shown) of the lens side contact portion 180. Thereby, the lens side contact part 180 is fixed to the mount part 110. Further, another screw is inserted into the second through hole portions 115 a to 115 d of the mount portion 110 and fastened to the fastening portions 171 a to 171 d of the lens barrel portion 170. Thereby, the mount part 110 is fixed to the lens barrel part 170.

  The fixing unit 210 constituting the lens mount provided in the imaging apparatus main body 200 is fixed to a frame (not shown) of the imaging apparatus main body 200. As shown in FIG. 2, the fixing portion 210 has first fastening portions 211a, 211b, 211c, and 211d, and second fastening portions 213a and 213b, and these fastening portions are tapped. Yes.

  As shown in FIGS. 2 and 3, the fixed mount portion 220 includes a body-side mount surface 221, an opening 222, a female screw portion 223, through-hole portions 224 a, 224 b, 224 c, 224 d, a cylindrical portion 225, an annular recess 226, The first contact surface 231 and the second contact surface 232 are provided. The body-side mount surface 221 contacts the lens-side mount surface 111 of the interchangeable lens 100 when the interchangeable lens 100 is attached to the imaging apparatus body 200. The bayonet claw portions 112a to 112c of the interchangeable lens 100 are inserted through the opening 222. The female screw portion 223 is formed around the optical axis. Screws are inserted into the through-hole portions 224a to 224d and fastened to the fastening portions 211a to 211d. Thereby, the fixed mount part 220 is fixed to the fixed part 210.

  As shown in FIG. 2, the movable mount part 240 has claw parts 241a, 241b, and 241c. Moreover, the movable mount part 240 has the external thread part 243 and fastening part 244a, 244b, 244c, 244d, as shown in FIG. The claw portions 241a to 241c have claw contact surfaces 242a, 242b, and 242c that come into contact with the bayonet claw contact surfaces 113a to 113c of the bayonet claw portions 112a to 112c of the interchangeable lens 100. The male screw portion 243 is screwed with the female screw portion 223, and the fastening portions 244a to 244d are tapped.

  The arms 260a and 260b have an equivalent structure. As shown in FIGS. 2 and 3, the arm portions 260a and 206b have arm portion contact surfaces 265 and 266, respectively. The arm portion 260a has through-hole portions 264a and 264b, and the arm portion 260b has through-hole portions 264c and 264d. The arm portions 260 a and 260 b protrude from the movable mount portion 240 in a region sandwiched between the first fixed portion 210 and the fixed mount portion 220. The screws inserted into the through-hole portions 264a to 264d are fastened to the fastening portions 244a to 244d, whereby the arm portions 260a and 260b are fixed to the movable mount portion 240.

  The main body side contact portion 380 has a contact portion that is electrically connected to the lens side contact portion 180 by mechanically contacting the lens side contact portion 180 of the interchangeable lens 100. The imaging apparatus main body 200 and the interchangeable lens 100 perform signal communication using the focal length, zoom position, aperture information, and the like as metadata through the lens side contact portion 180 and the main body side contact portion 380. In addition, the imaging apparatus main body 200 supplies power to the interchangeable lens 100 to drive the lens.

  In the present embodiment, the main body side contact portion 380 is a spring connector, and is slidable in the optical axis direction within the range of the amount of expansion and contraction of the spring (stroke amount). As shown in FIG. 2, the main body side contact portion 380 has through holes 381a and 381b. Screws are inserted through the through-hole portions 381a and 381b and fastened to the second fastening portions 213a and 213b of the fixing portion 210. Thereby, the main body side contact portion 380 is fixed to the fixing portion 210.

  The ring part 320 has an opening 321, through holes 326 a, 326 b, 326 c, 326 d and an operation part 330 as shown in FIG. 2, and also has an annular notch 323 as shown in FIG. 3. . The opening portion 321 is slidably engaged with the cylindrical portion 225 of the fixed mount portion 220, whereby the ring portion 320 is rotatably arranged with respect to the fixed mount portion 220. The annular notch 323 is provided at a position facing the annular recess 226 provided in the entire outer periphery of the fixed mount 220.

  The operation unit 330 has through-hole portions 332a and 332b. Screws are inserted through the through-hole portions 332a and 332b and the through-hole portions 326a and 326b, and fastened to the fastening portions 261a and 261b where the arm portions 260a are tapped. Further, screws are inserted into the through-hole portions 326c and 326d and fastened to the fastening portions 261c and 261d where the taps of the arm portion 260b are cut. Thereby, the ring portion 320 is fixed to the arm portions 260 a and 260 b and the operation portion 330 is fixed to the ring portion 320. It is also possible to dispose the operation unit 330 with respect to the through-hole portions 326c and 326d of the ring portion 320.

  As shown in FIG. 4, the rotation detection unit 370 includes a mechanical switch 371 including a switch tip 372 (hereinafter referred to as “mechanical switch 371”) and a substrate 373 on which the mechanical switch 371 is mounted. The mechanical switch 371 switches on / off (ON / OFF) electrical communication between the lens side contact portion 180 and the main body side contact portion 380 by an annular notch 323 of the ring portion 320 fastened to the movable mount portion 240. Take a role. The screw is inserted into the through hole portion 374 formed in the substrate 373 and fastened to the fastening portion 233 of the fixed mount portion 220. Thereby, the rotation detection unit 370 is fixed to the fixed mount unit 220.

  In the lens mount having the above-described structure, if there is a contactless contact when performing electrical communication including power feeding, a communication failure occurs between the interchangeable lens 100 and the imaging apparatus main body 200, and the interchangeable lens 100 malfunctions. May be caused. Therefore, after the movable mount part 240 rotates to a position where all the contacts of the lens side contact part 180 and the main body side contact part 380 are in reliable contact (position where electric communication can be performed), the lens side contact part 180 and the main body side contact It is necessary to turn on the electrical communication with the unit 380. Therefore, hereinafter, a method of attaching / detaching the interchangeable lens 100 to / from the imaging device main body 200 will be described, and a contact form of the contact between the lens side contact portion 180 and the main body side contact portion 380 during attachment / detachment will be described.

<Attaching / detaching method of the interchangeable lens 100 to / from the imaging apparatus main body 200>
FIG. 7 is a front view showing the movement of the components of the lens mount when the interchangeable lens 100 is attached to the imaging apparatus main body 200 over time. In FIG. 7, a part of the mount unit 110 illustrated in FIG. 6 is illustrated as the mount unit 110 of the interchangeable lens 100. FIG. 8A is an enlarged view of portion A in FIG. 7A, and FIG. 8B is an enlarged view of portion B in FIG. 7B. 9A is a cross-sectional view taken along the line CC in FIG. 7B, and FIG. 9B is a cross-sectional view taken along the line DD in FIG. 7D. 10A is a cross-sectional view perpendicular to the optical axis direction of the E portion in FIG. 7A, and FIG. 10B is the optical axis direction of the F portion in FIG. 7C. FIG.

  FIG. 7A illustrates that the bayonet claw portions 112a to 112c of the interchangeable lens 100 and the claw portions 241a to 241c of the movable mount portion 240 do not overlap each other on the optical axis projection, and the interchangeable lens 100 is located with respect to the imaging apparatus main body 200. And shows a detachable state. At this time, the first contact surface 231 of the fixed mount 220 is in contact with the arm contact surfaces 265 of the arm portions 260a and 260b.

  FIG. 8A shows the positional relationship between the bayonet claw 112a and the claw 241a in the optical axis direction in the state of FIG. 7A. In this state, the bayonet claw portions 112 a to 112 c can be inserted into the opening 222 in the optical axis direction, so that the interchangeable lens 100 can be attached to and detached from the imaging apparatus main body 200. 10A, in the state of FIG. 7A, the switch tip 372 of the mechanical switch 371 is pressed by the notch convex portion 325 of the annular notch portion 323 of the ring portion 320. FIG. It is shown that. The mechanical switch 371 includes an N / C circuit. At this time, the mechanical switch 371 is in an OFF state. Therefore, no electrical communication is performed between the interchangeable lens 100 and the imaging apparatus main body 200.

  When the interchangeable lens 100 is in the detachable position of FIG. 7A, the movable mount portion 240 is not rotated with respect to the fixed mount portion 220. Therefore, the movable mount portion 240 in the state of FIG. The rotation angle θa is 0 °. In the present embodiment, the movable mount unit 240 rotates by rotating the operation unit 330, and the interchangeable lens 100 is fastened and fixed to the imaging apparatus main body 200 by the rotation of the movable mount unit 240.

  FIG. 7B shows a state in which the bayonet claw contact surfaces 113a to 113c and the claw contact surfaces 242a to 242c begin to overlap on the optical axis projection by rotating the operation unit 330 by the rotation angle θb. Yes. FIG. 8B shows the positional relationship in the optical axis direction between the bayonet claw 112a and the claw 241a in the state of FIG. 7B. In this state, the bayonet claw part 112a and the claw part 241a overlap each other, so that the interchangeable lens 100 does not fall off from the imaging apparatus main body 200.

  As shown in the cross-sectional view taken along the line CC in FIG. 9A, the distance from the lens side mount surface 111 of the interchangeable lens 100 to the bayonet claw contact surface 113a is defined as “distance α”. Further, the distance between the main body side mounting surface 221 of the fixed mounting part 220 and the claw contact surface 242a of the movable mounting part 240 is defined as “distance β”. In the state of FIG. 9A (that is, the state of FIG. 7B), “distance α> distance β” is satisfied, and the interchangeable lens 100 is wobbled in the optical axis direction. The lens 100 does not fall off.

  When the stroke amount of the spring connector of the main body side contact portion 380 is larger than the amount of rattling (= β−α) of the interchangeable lens 100, the lens side contact portion 180 and the main body side are at a rotation angle larger than the rotation angle θb. It can be determined that the contact portion 380 is in reliable contact. In the lens mount according to this embodiment, it is assumed that the stroke amount of the spring connector of the main body side contact portion 380 is larger than the amount of rattling of the interchangeable lens 100 (= β−α).

  Since the female screw portion 223 and the male screw portion 243 are screwed into the claw portions 241 a to 241 c of the movable mount portion 240, the claw portions 241 a to 241 c are directed toward the first fixed portion 210 along the optical axis direction according to the rotation of the movable mount portion 240. Move. FIG. 7C shows a state where the lens side contact portion 180 and the main body side contact portion 380 are reliably in contact with each other with the operation unit 330 further rotated from the state of FIG. ing.

  As shown in FIG. 10B, in this state, the switch tip 372 of the mechanical switch 371 is in a state of dropping into the notch recess 324 of the annular notch 323 of the ring part 320. Thus, the pressed state is released when the position of the switch tip 372 of the mechanical switch 371 is switched from the notch protrusion 325 of the annular notch 323 of the ring part 320 to the notch recess 324. As a result, the mechanical switch 371 is turned on, and electrical communication between the interchangeable lens 100 and the imaging apparatus main body 200 is started.

  7D, the operation unit 330 is further rotated from the state of FIG. 7C to obtain a rotation angle θd, and the bayonet claw contact surfaces 113a to 113c and the claw contact surfaces 242a to 242c have the most rotation angles. The state which is contacting in the small state is shown. As for the rotation angle θd, when the distance α is minimum due to individual differences of the mount portions 110 and the distance β between the fixed mount portion 220 and the movable mount portion 240 at an arbitrary position is minimum, these contact surfaces are It is the rotation angle that comes into contact. At this time, as shown in FIG. 9B, the mount part 110 of the interchangeable lens 100 becomes “distance α = distance β”, and is fixed by the fixed mount part 220 and the movable mount part 240 in the optical axis direction. The interchangeable lens 100 is free from rattling.

  FIG. 7E shows a state in which the operation unit 330 is further rotated to obtain a rotation angle θe, and the bayonet claw contact surfaces 113a to 113c and the claw contact surfaces 242a to 242c are in contact with each other with the largest rotation angle. Is shown. In contrast to the state of FIG. 7D, the rotation angle θe has the maximum distance α due to the individual difference of the mount portions 110, and the maximum distance β between the fixed mount portion 220 and the movable mount portion 240 at an arbitrary position. Is the rotation angle at which both contact surfaces come into contact.

  FIG. 7F shows a state in which the operation unit 330 is further rotated to a rotation angle θf, and the movable mount unit 240 is rotated to the maximum rotation angle with respect to the fixed mount unit 220. At this time, the second abutment surface 232 of the fixed mount portion 220 abuts on the arm portion abutment surface 266 of the arm portions 260a and 260b. The rotation angle θf needs to be equal to or greater than the rotation angle θe (θf ≧ θe) so that the second contact surface 232 and the arm contact surface 266 come into contact after the interchangeable lens 100 is securely fastened. .

  In the state of FIG. 7F, any one of the mount part 110 of the interchangeable lens 100, the fixed mount part 220 of the imaging apparatus main body 200, and the movable mount part 240 is deformed. Therefore, by preventing the movable mount portion 240 from moving relative to the fixed mount portion 220 so that these portions do not exceed the elastic deformation region, plastic deformation of the respective portions due to deformation can be prevented.

<Rotation detection of movable mount 240>
[Rotation detection system block]
FIG. 11 is a block diagram illustrating a control system related to the rotation detection unit 370. The rotation detection unit 370 is switched on / off by the operation of the operation unit 300. The control unit 400 detects on / off of the rotation detection unit 370 and switches on / off of electrical communication between the interchangeable lens 100 and the imaging apparatus main body 200. The display unit 410 is provided in the imaging apparatus main body 200 and displays information related to the imaging apparatus main body 200 to the user.

[Rotation detection flow]
FIG. 12 is a flowchart of the rotation detection process of the movable mount unit 240 at the time of attaching / detaching the interchangeable lens 100, and shows a process flow when the movable mount part 240 is rotated from the attachable / detachable position of the interchangeable lens 100.

  When a power button (not shown) provided on the imaging apparatus body 200 is pressed, the imaging apparatus body 200 is turned on (step S100). At this time, the movable mount unit 240 is in a position where the interchangeable lens 100 can be attached and detached (rotation angle θa = 0 °), and the mechanical switch 371 of the rotation detection unit 370 is in an OFF state (step S101).

  The control unit 400 determines whether the bayonet claw portions 112a to 112c of the interchangeable lens 100 are dropped into the opening 222 of the imaging device main body 200 (step S102). Specifically, this determination is performed by determining whether or not communication is possible between the imaging apparatus main body 200 and the interchangeable lens 100. In the state of FIG. 7B, that is, when the bayonet pawl portions 112 a to 112 c of the interchangeable lens 100 are dropped into the opening 222 of the fixed mount portion 220, the lens side contact portion 180 and the main body side contact portion 380. Are in contact with each other, and communication between them becomes possible. Therefore, when communication is impossible (NO in S102), it is determined that the interchangeable lens 100 is not attached (step S112), and the process returns to step S102. If communication is possible (YES in S102), the on / off of the telecommunication can be selected by turning on / off the mechanical switch.

  Next, if the mounting of the interchangeable lens 100 is started by the rotation operation of the operation unit 330, the mechanical switch 371 is turned on when the rotation angle of the movable mount unit 240 becomes θc (see FIG. 7C). Turn on. Therefore, the control unit 400 determines whether or not the mechanical switch 371 has been switched from OFF to ON (step S111). When the mechanical switch 371 remains off (NO in S111), the imaging apparatus main body 200 cannot communicate with the interchangeable lens 100 (step S124), and the process returns to step S111. On the other hand, when the mechanical switch 371 is turned on (YES in S111), the control unit 400 determines that the rotation operation of the operation unit 300 is finished and the interchangeable lens 100 is fixed to the imaging apparatus main body 200 (step S121). ). Therefore, the control unit 400 starts electrical communication between the interchangeable lens 100 and the imaging apparatus main body 200 (step S122).

  After the interchangeable lens 100 is fixed, the control unit 400 continues to determine whether or not the mechanical switch 371 is on (step S123). If the mechanical switch 371 is in the ON state (YES in S123), the electric communication is continued and the imaging device is held in a shootable state (step S131). On the other hand, when the mechanical switch 371 is turned off during the execution of the electrical communication (when the mechanical switch 371 is in the on state at the rotation angles θd to θe) (NO in S123), the electrical communication with the interchangeable lens 100 is terminated. (Step S132). Then, on the display unit (not shown) of the imaging apparatus main body 200, the fact that the movable mount unit 240 is rotated toward the detachable position side of the interchangeable lens 100 and the interchangeable lens 100 is loosely fixed is displayed to the user. To call attention (step S133). As a result, careless removal of the interchangeable lens 100 is prevented, and the user again performs the turning operation of the operation unit 330. Therefore, the control unit 400 returns the process to step S111. Note that the alerting in step S133 may be a combination of display and sound, or a configuration using only sound.

  Note that in order to reliably perform mounting of the interchangeable lens 100 and electrical communication between the interchangeable lens 100 and the imaging apparatus main body 200, the rotation angle θc of the movable mount 240 at the time of step S121 is set to the rotation angle θb. As described above, it must be smaller than the rotation angle θd. In addition, the rotation angle of the movable mount 240 in step S132 is preferably an angle that can be notified immediately when the interchangeable lens 100 is loosened. Therefore, the rotation angle θd is greater than the rotation angle θb. A close angle is desirable.

  As described above, according to the present embodiment, since power is supplied in a state where all the contact points of the lens side contact part 180 and the main body side contact part 380 are in reliable contact with each other, it is possible to prevent a telecommunication failure from occurring. Can be prevented.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included.

DESCRIPTION OF SYMBOLS 100 Interchangeable lens 110 Mount part 111 Lens side mount surface 112a-112c Bayonet nail | claw part 180 Lens side electrical communication contact part 200 Imaging device main body 210 Fixed part 220 Fixed mount part 221 Main body side mount surface 223 Female thread part (1st thread part)
240 Movable mount part 241a-241c Claw part 243 Male thread part (2nd thread part)
320 Ring unit 330 Operation unit 370 Rotation detection unit 371 Mechanical switch (mechanical switch)
380 Main body side telecommunications contact section 400 Control section 410 Display section

Claims (5)

A lens mount provided in the imaging device body for attaching and detaching the interchangeable lens to the imaging device body,
A fixed mount portion having a main body-side mount surface that comes into contact with the lens-side mount surface of the interchangeable lens, and a first screw portion;
A movable mount portion having a claw portion that engages with the bayonet claw portion of the interchangeable lens, and a second screw portion that is screwed with the first screw portion;
A main body side telecommunication contact portion electrically connected to a lens side telecommunication contact portion of the interchangeable lens;
The movable mount portion is fixed to the fixed mount portion, and the movable mount portion is rotated in the optical axis direction according to screwing of the first screw portion and the second screw portion by rotating the movable mount portion about the optical axis. Detecting means for detecting whether or not the movable mount portion is in a position where electrical communication between the lens side electrical communication contact portion and the main body side electrical communication contact portion can be performed when moving along ,
When it is detected by the detection means that the movable mount portion is in a position where the electric communication can be performed, electric communication between the lens side electric communication contact portion and the main body side electric communication contact portion is executed. And a lens mount. A ring portion that is disposed rotatably with respect to the fixed mount portion and is fixed to the movable mount portion, and has an annular notch portion including a notch convex portion and a notch concave portion;
The detection means is switched on / off by switching between a state in contact with the notch protrusion and a state in contact with the notch recess when the ring portion rotates according to the rotation of the movable mount portion. The lens mount according to claim 1, wherein the lens mount detects whether or not the movable mount portion is in a position where the electrical communication can be performed. Either one of the lens side telecommunication contact part and the main body side telecommunication contact part is a spring connector that is slidable in the optical axis direction,
The stroke amount of the spring connector is such that the bayonet claw portion and the claw portion are engaged from the state where the bayonet claw portion and the claw portion start to overlap on the optical axis projection by rotating the movable mount portion. The lens mount according to claim 1, wherein the movable mount portion is longer than a distance moved in the optical axis direction. A display unit provided in the imaging apparatus body;
The control means terminates the electric communication when the detecting means detects that the movable mount portion is not in a position where the electric communication can be performed during the electric communication, and replaces the display unit with the replacement unit. The lens mount according to any one of claims 1 to 3, wherein the fact that the lens is loose is displayed.   An image pickup apparatus comprising an image pickup apparatus body including the lens mount according to claim 1.

Images