JP2011017808A - Interchangeable lens and camera with interchangeable lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera with interchangeable lenses that achieves protection of an interchangeable lens from dust by providing the interchangeable lens which includes a dust-proofing mechanism on a mount side, and a camera body to which the interchangeable lens is attached.SOLUTION: The camera with interchangeable lenses includes the camera body, and the interchangeable lens including the dust-proofing mechanism 10. The dust-proofing mechanism 10 includes a movable ring 61, a fixed ring 63, two dust-proofing doors 65 pivotally attached to the movable ring 61 and including an opening/closing control projection 65b projecting to the fixed ring 63 side, an elastic body for closing 71 energizing the dust-proofing door 65 in a closing direction, and a ring coupling elastic body 73. The dust-proofing mechanism 10 is constituted such that, when the movable ring 61 turns in a lens barrel, the opening/closing control projection 65b of the dust-proofing door 65 slides in a dust-proofing door locking rail 63b of the fixed ring 63, but stops its sliding by locking with one end face in the dust-proofing door locking rail 63b, and a rotary shaft of the dust-proofing door 65 still turns together with the movable ring 61, so that the dust-proofing door 65 is opened.

Description

  The present invention relates to an interchangeable lens having a dustproof mechanism and an interchangeable lens camera having the interchangeable lens.

  In a lens interchangeable single-lens reflex camera or the like, dust or the like may enter the camera body from the mount portion when the lens is replaced, or dust or the like may adhere to the mount mounting side of the interchangeable lens. These dusts sometimes appear as noise in the captured image, causing a problem that the quality of the captured image is lowered.

  Many recent interchangeable lens cameras are sold with a dustproof function, and a proposal for a dustproof function has also been made. For example, in Japanese Patent Laid-Open No. 2006-293097 (Patent Document 1), dust is detected by a dust-proof optical element, dust detection means (dust presence / absence determination means) for detecting dust on the optical path, and dust detection means. In some cases, a proposal has been made for a camera provided with a vibrating means for vibrating an optical element.

  In the proposal of Patent Document 1, even when dust or the like is mixed in the camera body when the lens is replaced and dust is attached to the lens or the image pickup device, the dust can be detected and removed. Generation of noise due to dust in the captured image can be prevented.

JP 2006-293097 A

  As described above, many cameras in recent years have a dustproof function. However, on the mount side of the interchangeable lens, after the interchangeable lens is detached from the camera body, a mounting lens cap (rear cap) or the like is attached to prevent dust and the like from attaching. In such an interchangeable lens, there is a time lag between the time when the interchangeable lens is removed from the camera body and the time when the lens cap is attached. During this time, the lens on the mount side is exposed to the outside, so dust is deposited on this lens. There is a risk of adhesion. Further, even if the dustproof function in the camera body is excellent, dust attached to the interchangeable lens side may enter the camera body.

  In addition, when replacing the lens, it takes time and effort to attach the cap to the removed interchangeable lens and to remove the cap of the interchangeable lens to be attached. Sometimes occurred.

  The present invention has been made in view of such problems of the prior art, and includes an interchangeable lens having a dustproof mechanism on the mount side, and a lens that has the interchangeable lens and the camera body to realize dustproof of the interchangeable lens. And an interchangeable camera.

  The present invention provides an interchangeable lens comprising a lens barrel provided with an optical system, and a lens-side mount member that is fixed to an end of the lens barrel that is mounted on the camera body and has an opening in the center. In the lens barrel, in the vicinity of the lens-side mount member, a movable member that always covers the opening and retracts from the opening when attached to the camera body through the lens-side mount member. A dust-proof mechanism is arranged.

  In the interchangeable lens of the present invention, the dust-proof mechanism opens and closes as the movable member in conjunction with the rotation of the lens barrel when the interchangeable lens is attached to or detached from the camera body. It is provided with a dustproof door.

  Furthermore, in the interchangeable lens according to the present invention, the dust-proof mechanism is disposed so as to be rotatable with the lens barrel in the lens barrel, and a movable ring that is rotatably disposed inside the lens barrel. The fixed ring, the two dustproof doors provided with opening and closing control projections that are pivotally attached to the movable ring and project toward the fixed ring, the closing elastic body that urges the dustproof door in the closing direction, and the movable It is comprised from the elastic body for a ring connection which connects a ring and the said fixed ring, It is characterized by the above-mentioned.

  In the interchangeable lens according to the aspect of the invention, the lens-side mount member includes an opening that is an arcuate slide rail on an annular surface, and the movable ring penetrates the slide rail of the lens-side mount member on a rear end surface. It is provided with the rotation support protrusion inserted.

  Furthermore, in the interchangeable lens of the present invention, the movable ring includes two rotation shafts on which the dustproof door is pivotally mounted at a position that is substantially symmetrical from the center of the front end surface, and in the vicinity of the two rotation shafts. Each position is provided with a dustproof door projection, and further provided with a connection projection connected to the fixed ring via an elastic body for ring connection, and the fixed ring is between the connection projection of the movable ring on the rear end surface. The ring-connecting elastic member for fixing the ring is provided with a movable ring pulling protrusion, and two openings as a dust-proof door locking rail on which the opening / closing control protrusion of the dust-proof door slides are formed on the annular surface. The elastic body has one end fixed to the dustproof door projection of the movable ring and the other end fixed to the opening / closing control projection of the dustproof door to urge the dustproof door in the closing direction. The body has one end fixed to the connecting projection of the movable ring, And an end is fixed to the movable ring towing protrusion of the stationary ring.

  The interchangeable lens camera of the present invention includes a camera body including a camera side mount member, and an interchangeable lens as described above, and the camera side mount member is disposed within the slide rail of the lens side mount member. When the interchangeable lens is rotated in a state where the lens side mount member is inserted into the camera side mount member, the camera side mount member is provided. The locking projections of the movable ring and the rotation support projections of the movable ring are locked so that the rotation support projection slides in the slide rail, and the movable ring also rotates in the lens barrel. It is characterized by.

  ADVANTAGE OF THE INVENTION According to this invention, the interchangeable lens provided with the dust-proof mechanism in the mount side, and the interchangeable lens camera which provided this interchangeable lens and the camera main body, and implement | achieved dustproof of the interchangeable lens can be provided.

1 is an external perspective view of an interchangeable lens camera according to an embodiment of the present invention. It is the perspective view which permeate | transmitted a part of interchangeable lens which concerns on the Example of this invention. It is a disassembled perspective view of the dustproof mechanism which concerns on the Example of this invention. It is a perspective view of the dustproof mechanism concerning the example of the present invention. It is a front schematic diagram explaining the use condition of the dustproof mechanism which concerns on the Example of this invention.

  Hereinafter, modes for carrying out the present invention will be described. The interchangeable lens camera 1 of the present invention includes a camera body 2 that includes an image sensor, an imaging signal processing circuit, and the like and includes a camera-side mount member 21, and an interchangeable lens 5 that includes a dustproof mechanism 10.

  The interchangeable lens 5 includes a lens barrel 51 having an optical system, and a lens-side mount member 55 that is fixed to an end of the lens barrel 51 that is mounted on the camera body 2 and has an opening in the center. In the lens barrel 51, in the vicinity of the lens side mount member 55, a movable member that always covers the opening and retracts from the opening when attached to the camera body 2 via the lens side mount member 55. A dustproof mechanism 10 having the following is arranged.

  Further, the dust-proof mechanism 10 includes a movable ring 61 that is rotatably arranged inside the lens barrel 51, a fixed ring 63 that is arranged to rotate together with the lens barrel 51 in the lens barrel 51, and is movable. And two dustproof doors 65 each having an opening / closing control protrusion 65b that is pivotally attached to the ring 61 and protrudes toward the fixed ring 63. Furthermore, the dustproof mechanism 10 includes a closing elastic body 71 that biases the dustproof door 65 in the closing direction, and a ring connecting elastic body 73 that connects the movable ring 61 and the fixed ring 63.

  Further, the lens side mount member 55 has an opening formed as an arcuate slide rail 55c on an annular surface. The slide rail 55c is formed with a rotation angle slightly larger than a rotation angle that is rotated when the interchangeable lens 5 is attached to the camera body 2 as a central angle.

  The movable ring 61 includes a rotation support protrusion 61a that is inserted into the slide rail 55c of the lens-side mount member 55 on the rear end surface. Further, the movable ring 61 includes two rotating shafts 61b on which the dustproof door 65 is pivotally mounted at a position that is substantially symmetrical from the center of the front end surface. Further, the movable ring 61 includes a connection protrusion 61d connected to the fixed ring 63 via the ring connection elastic body 73, and includes a dustproof door protrusion 61c in the vicinity of the two rotation shafts 61b.

  The fixed ring 63 includes a movable ring pulling protrusion 63a to which a ring connecting elastic body 73 is fixed between the rear end surface and the connection protrusion 61d of the movable ring 61. The fixed ring 63 has two openings as a dustproof door locking rail 63b on which the opening / closing control projection 65b of the dustproof door 65 slides on the annular surface.

  The closing elastic body 71 has one end fixed to the dustproof door projection 61c of the movable ring 61 and the other end fixed to the opening / closing control projection 65b of the dustproof door 65 to urge the dustproof door 65 in the closing direction. Yes. Further, one end of the ring connecting elastic body 73 is fixed to the connecting protrusion 61d of the movable ring 61, and the other end is fixed to the movable ring pulling protrusion 63a of the fixed ring 63.

  The camera-side mount member 21 includes a locking protrusion 26 that locks with the rotation support protrusion 61a of the movable ring 61 in the slide rail 55c of the lens-side mount member 55, so that the interchangeable lens 5 can be attached to the camera body 2. When the lens side mount member 55 is inserted into the camera side mount member 21 and is rotated, the locking projection 26 of the camera side mount member 21 and the rotation support projection 61a of the movable ring 61 are locked. The rotation support protrusion 61a slides in the slide rail 55c, and the movable ring 61 also rotates in the lens barrel 51.

  When the movable ring 61 rotates relative to the lens barrel 51 in the lens barrel 51, the opening / closing control protrusion 65b of the dustproof door 65 causes the dustproof door locking rail of the fixed ring 63 to move to the dustproof mechanism 10. Although it slides in 63b, it is locked with one end surface of the dustproof door locking rail 63b and stops sliding, and the rotating shaft of the dustproof door 65 rotates together with the movable ring 61, so the dustproof door 65 opens. It is a mechanism.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external perspective view of an interchangeable lens camera 1 according to an embodiment of the present invention. The interchangeable lens camera 1 of the present embodiment is characterized in that a dustproof mechanism 10 described later is provided on the mount side of the interchangeable lens 5. In this embodiment, the front refers to the mount side of the camera body 2, that is, the side where the interchangeable lens 5 is mounted, and the rear refers to the side facing the mount side of the camera body 2. In the interchangeable lens 5, the rear indicates the mount side, and the front indicates the end surface side facing the mount side. Furthermore, the rotation direction in the present embodiment refers to a state in which the camera body is viewed from the front to the rear, that is, a direction in a front view.

  As shown in FIG. 1, the interchangeable lens camera 1 includes a camera body 2 and an interchangeable lens 5 that can be attached to and detached from the camera body 2. The camera body 2 has an opening for mounting the interchangeable lens 5 on the front end surface, and the camera side mount member 21 is fixed to the opening. The camera-side mount member 21 is an annular body, and is formed such that a plurality of engagement receiving portions 25 that engage the interchangeable lens 5 on the inner peripheral surface protrude inward. Further, on the front end surface of the camera side mount member 21, a locking projection 26 for operating a dustproof mechanism 10 of the interchangeable lens 5 described later is formed. Further, an index mark 28 serving as an index when the interchangeable lens 5 is attached is written at a predetermined position of the camera side mount member 21. Although not shown, the camera body 2 incorporates an image sensor, an image signal processing circuit, and the like.

  FIG. 2 is a perspective view in which a part of the interchangeable lens 5 according to the present embodiment is transmitted. As shown in FIG. 2, the interchangeable lens 5 includes a lens barrel 51, an imaging optical system (not shown) composed of a movable lens group and a fixed lens group arranged in the lens barrel 51, and a lens barrel 51. A lens-side mount member 55 attached to the rear end of the lens barrel 51, and a dust-proof mechanism 10 disposed in the vicinity of the lens-side mount member 55 inside the lens barrel 51.

  The lens barrel 51 is a cylindrical body, and as described above, a plurality of lens groups, a drive board, a lens motor, and the like are accommodated therein, and a lens side mount member 55 is fixed to the mount side, that is, the rear end. . In addition, an index mark 52 serving as an index when the interchangeable lens 5 is attached to the camera body 2 is attached to a predetermined position of the lens barrel 51. The interchangeable lens 5 is inserted into the camera body 2 with the mount portion of the interchangeable lens 5 in a state where the position of the index mark 52 of the lens barrel 51 is aligned with the index mark 28 of the camera body 2. Then, the interchangeable lens 5 is attached to the camera body 2 by rotating it to the right.

  The lens side mount member 55 is an annular body having an opening in the center, and an insertion portion 55a is formed to be inserted into the camera side mount member 21 of the camera body 2 so as to protrude rearward. Further, in the vicinity of the rear end of the insertion portion 55a, the same number of engagement portions 55b as the engagement receiving portions 25 of the camera side mount member 21 are formed so as to protrude outward. This engaging portion 55b is inserted into the opening of the camera side mount member 21 and the engagement receiving portion of the camera side mount member 21 when the interchangeable lens 5 is rotated rightward by a predetermined angle. Engage with 25. Therefore, the interchangeable lens 5 is firmly fixed to the camera body 2 when the engaging portion 55b and the engagement receiving portion 25 are engaged.

  Further, the annular surface of the lens side mount member 55 is formed with an opening as a slide rail 55c on which the locking projection 26 of the camera side mount member 21 slides when the interchangeable lens 5 is attached to the camera body 2. ing. The slide rail 55c is formed in an arc shape centering on the center of the lens side mount member 55. The length of the arc of the slide rail 55c is set when the interchangeable lens 5 is attached to the camera body 2. The length is formed by a central angle that is slightly larger than the rotation angle at which the interchangeable lens 5 is rotated.

  FIG. 3 is an exploded perspective view of the dustproof mechanism 10 of the present embodiment. As shown in FIG. 3, the dust-proof mechanism 10 includes a movable ring 61 rotatably disposed inside the lens barrel 51, and a fixed ring 63 positioned in front of the movable ring 61 and fixed to the lens barrel 51. And two rotatable dustproof doors 65 positioned between the movable ring 61 and the fixed ring 63 and pivotally attached to the movable ring 61, and a closing elastic body 71 connecting the movable ring 61 and the dustproof door 65. And two tension springs, and a tension spring as a ring connecting elastic body 73 that connects the movable ring 61 and the fixed ring 63.

  The movable ring 61 is an annular body having an annular plane with a predetermined width between the outer peripheral edge and the inner peripheral edge, and is arranged inside the lens barrel 51 so that the center is located on the central axis of the lens barrel 51. It is arranged to be movable. On the rear end surface of the movable ring 61, a rotation support protrusion 61a that slides in the slide rail 55c of the lens side mount member 55 is formed. Further, on the front end surface of the movable ring 61, two rotating shafts 61b on which the dustproof door 65 is pivotally attached are formed. In the vicinity of the rotating shaft 61b, the dustproof door 65 and the closing elastic body 71 are interposed. Two dustproof door projections 61c that are connected together are formed. Further, on the front end surface of the movable ring 61, a connection projection 61d connected to the fixed ring 63 via the ring connection elastic body 73 is formed.

  Further, the two rotation shafts 61 b of the movable ring 61 are respectively formed at positions that are substantially symmetrical with respect to the center of the movable ring 61, that is, on a straight line of a radial line that passes through the center of the movable ring 61. Further, the two dustproof door protrusions 61c are formed at positions that are substantially symmetrical with respect to the center of the movable ring 61 at positions near the left side in the circumferential direction from the position where the rotation shaft 61b is formed. Yes. The connection protrusion 61d is formed in the vicinity of the position where the rotation support protrusion 61a is formed on the front end surface.

  The dustproof door 65 has a substantially trapezoidal shape with rounded corners, and a shaft attachment portion 65a is formed so as to extend the lower bottom portion, and an opening / closing control projection 65b projects forward in the vicinity of the shaft attachment portion 65a. It is formed to do. The dustproof door 65 is pivotally attached to the rotating shaft 61b of the movable ring 61 by a pivoting portion 65a. The dustproof door 65 is connected to the dustproof door projection 61c of the movable ring 61 via the closing elastic body 71 by the opening / closing control projection 65b. Therefore, the dustproof door 65 is urged by the closing elastic body 71 in the closing direction, that is, in the clockwise direction. In addition, the two dustproof doors 65 seal the opening of the lens side mount member 55, that is, the optical system on the mount side of the interchangeable lens 5 by contacting the lower bottom portion facing each other when closed. This prevents dust and the like from adhering to the optical system of the lens 5. That is, the dustproof door 65 functions as a movable member that closes the opening of the lens side mount member 55.

  The fixed ring 63 is an annular body having an outer diameter smaller than the movable ring 61 and an inner diameter larger than the movable ring 61, and is fixed to the lens barrel 51 so that the center is located on the central axis of the lens barrel 51. Has been. The fixed ring 63 includes a movable ring pulling protrusion 63a formed so as to protrude rearward from a predetermined position on the outer peripheral edge to a position protruding outward. The movable ring pulling protrusion 63a of the fixed ring 63 is positioned substantially concentrically with the connection protrusion 61d of the movable ring 61, and the ring connection is made between the movable ring pulling protrusion 63a and the connection protrusion 61d of the movable ring 61. An elastic body 73 is inserted. Further, the fixed ring 63 is fixed to the lens barrel 51 so that the movable ring pulling protrusion 63a comes to the right position in the circumferential direction of the connection protrusion 61d of the movable ring 61. That is, the movable ring 61 is urged in the clockwise direction by the ring connecting elastic body 73.

  Furthermore, the fixed ring 63 includes openings as two dustproof door locking rails 63b through which the opening / closing control protrusions 65b of the dustproof door 65 are inserted. The dustproof door locking rail 63b is an arc-shaped opening centered on the center of the fixed ring 63, and the two dustproof door locking rails 63b are respectively located at positions that are substantially symmetrical with respect to the center of the fixed ring 63. Is formed. The length of the arc of the dustproof door locking rail 63b is a length formed by a central angle smaller than the central angle of the sliding rail 55c described above.

  Next, the combined state of each member in the dustproof mechanism 10 formed of the above members will be described. FIG. 4 is a perspective view of the dustproof mechanism 10 of the present embodiment. As shown in FIG. 4, the movable ring 61 is disposed in the vicinity of the lens side mount member 55 in a state where the rotation support protrusion 61 a is inserted into the slide rail 55 c of the lens side mount member 55. That is, when the interchangeable lens 5 is viewed from the rear to the front, the rotation support protrusion 61a protrudes into the slide rail 55c of the lens side mount member 55. When the interchangeable lens 5 is detached from the camera body 2, a gap is formed between the rotation support protrusion 61a and the right end surface of the slide rail 55c of the lens side mount member 55. When the interchangeable lens 5 is attached to the camera body 2, this gap is more specifically the state of the interchangeable lens 5 with the position of the index mark 52 of the lens barrel 51 aligned with the index mark 28 of the camera body 2. This is a gap through which the locking projection 26 of the camera body 2 penetrates when the mount part is inserted into the mount part of the camera body 2.

  Two dustproof doors 65 are pivotally attached to the front end surface of the movable ring 61 in a state where the dustproof doors 65 are urged in the closing direction by the closing elastic body 71. Further, in front of the dustproof door 65, a fixed ring 63 is fixed to the lens barrel 51 with the opening / closing control projection 65b of the dustproof door 65 inserted into the dustproof door locking rail 63b. Further, a ring connecting elastic body 73 is attached to the movable ring pulling protrusion 63a of the fixed ring 63 and the connection protrusion 61d of the movable ring 61, and urges the movable ring 61 in the clockwise direction.

  Next, the operation of the dustproof mechanism 10 will be described. FIG. 5 is a schematic front view illustrating a usage state of the dustproof mechanism 10 of the present embodiment. When the dustproof door 65 is closed, that is, when the interchangeable lens 5 is detached from the camera body 2, as shown in FIG. 5A, the rotation support protrusion 61a of the movable ring 61 is mounted on the lens side mount. The member 55 is located in the vicinity of the right end surface in the circumferential direction in the slide rail 55c of the member 55, and between the right end surface of the slide rail 55c and the rotation support protrusion 61a, as described above, the locking protrusion 26 of the camera body 2. A gap is formed through which is inserted.

  When the dustproof door 65 is in the closed state, the closing elastic body 71 and the ring connecting elastic body 73 are in a contracted state, and the opening / closing control projection 65b of the dustproof door 65 is in the circumferential direction in the dustproof door locking rail 63b. In the vicinity of the right end face.

  When the interchangeable lens 5 is attached to the camera body 2, that is, with the position of the index mark 52 of the lens barrel 51 aligned with the index mark 28 of the camera body 2, the mount portion of the interchangeable lens 5 is mounted on the camera body 2. When the camera-side mount member 21 of the camera body 2 and the lens-side mount member 55 of the interchangeable lens 5 are engaged with each other by inserting into the mount and rotating the interchangeable lens 5 in the right direction, FIG. As shown in FIG. 3, the rotation support protrusion 61a of the movable ring 61 is locked to the locking protrusion 26 of the camera body 2, and the movable ring 61 is fixed to the camera body by the locking state of the locking protrusion 26 and the rotation support protrusion 61a. The lens side mount member 55 and the fixed ring 63 rotate relative to the camera body 2 together with the lens barrel 51.

  That is, since the lens-side mount member 55 and the fixed ring 63 are fixed to the lens barrel 51, the lens barrel 51 rotates and rotates, but the movable ring 61 is movable within the lens barrel 51. Therefore, the lens barrel 51 is rotated leftward.

  When the lens barrel 51 is rotated with respect to the camera body 2 as described above, the rotation support protrusion 61a of the movable ring 61 is on the right side in the circumferential direction in the slide rail 55c of the lens side mount member 55. Slide from the vicinity of the end face to the vicinity of the left end face. At this time, the fixed ring 63 rotates with respect to the camera body 2 together with the lens barrel 51, and the opening / closing control projection 65b of the dustproof door 65 is the right end surface in the circumferential direction within the dustproof door locking rail 63b of the fixed ring 63. When the stationary ring 63 further moves from the vicinity to the vicinity of the left end face and further rotates, the left end face in the circumferential direction of the dustproof door locking rail 63b is locked and urged to the right. Accordingly, the dustproof door 65 rotates about the axis, and the door is in an open state and is in a state of being off the optical path of the interchangeable lens 5. At this time, the closing elastic body 71 and the ring connecting elastic body 73 are in an extended state, and the movable ring 61 is urged in the clockwise direction.

  The dust-proof door locking rail 63b of the fixed ring 63 is formed in an arc shape so that the opening and closing operation of the dust-proof door 65 has a play with respect to the movement of the rotation support protrusion 61a. The dustproof door 65 is prevented from opening when the support protrusion 61a is slightly operated.

  When the interchangeable lens 5 is detached from the camera body 2, the movable ring 61 rotates within the lens barrel 51 and returns to the original position by the elastic force of the closing elastic body 71 and the ring connecting elastic body 73. The dustproof door 65 also rotates in the closing direction, the dustproof door 65 is closed, and the opening of the lens side mount member 55 is closed.

  According to the interchangeable lens 5 of the present example, the dust-proof mechanism 10 that seals the opening of the lens-side mount member 55 from the inside is disposed, so that the mount-side end portion of the interchangeable lens 5 can be installed without attaching a rear cap or the like. It is possible to prevent dust and the like from adhering to the optical system located at the position.

  In addition, the dustproof mechanism 65 is opened and closed in accordance with the rotation of the lens barrel 51, that is, in conjunction with the rotation of the lens barrel 51, when the dustproof mechanism 10 is attached to or detached from the camera body 2. Since the lens located at the mount side end of the interchangeable lens 5 does not come into contact with the outside air even when the interchangeable lens 5 is attached to or detached from the camera body 2, dust etc. It is possible to reliably prevent the lens from adhering to the lens.

  The dust-proof mechanism 10 includes the movable ring 61, the fixed ring 63, and the dust-proof door 65, so that the movable ring 61 rotates relative to the lens barrel 51 in the lens barrel 51. When moved, the dustproof mechanism 10 that opens the dustproof door 65 can be provided.

  Furthermore, the slide rail 55c is formed on the lens-side mount member 55, and the movable ring 61 is provided with a rotation support protrusion 61a that is inserted through the slide rail 55c. It is possible to realize a mechanism that automatically opens the dustproof door 65 when the is attached.

  In addition, the fixed ring 63 is provided with a dustproof door locking rail 63b, and the opening / closing control projection 65b of the dustproof door 65 is slidable in the dustproof door locking rail 63b. Since play can be provided, the dust-proof mechanism 10 that does not open and close when the rotation support protrusion 61a is operated slightly and does not open and close can be provided.

  By using the interchangeable lens 5 having such a dustproof mechanism 10, the interchangeable lens 5 can be attached to the camera body 2 simply by forming one protrusion (26) on the camera-side mount member 21 of the camera body 2. In this case, the dust-proof door 65 that has blocked the opening of the lens-side mount member 55 is automatically opened, and when it is detached, the dust-proof door 65 that closes the opening of the lens-side mount member 55 is automatically closed. The interchangeable lens 5 and the interchangeable lens camera 1 that can use the interchangeable lens 5 can be provided.

In addition, this invention is not limited to the above Example, A change and improvement are freely possible in the range which does not deviate from the summary of invention.
For example, in the above-described embodiment, the opening of the lens side mount member 55 is closed by the two dustproof doors 65. However, the opening may be closed by a plurality of blades such as a diaphragm of a camera. Further, if the opening of the lens side mount member 55 is small, it can be closed by one movable member, that is, one door or blade.

  In the above embodiment, the dustproof door 65 of the dustproof mechanism 10 is linked to the rotation operation of the lens barrel 51 when the interchangeable lens 5 is attached to the camera body 2 or when the interchangeable lens 5 is attached to or detached from the camera body 2. However, the opening and closing of the dustproof door 65 is not limited to the rotation operation of the lens barrel 51 as long as it is interlocked with the attaching / detaching operation of the interchangeable lens 5 with respect to the camera body 2.

1 Interchangeable lens camera
2 Camera body 5 Interchangeable lens
10 Dust-proof mechanism 21 Camera-side mounting member
25 Engagement receiving part 26 Locking projection
28 Index mark 51 Lens barrel
52 Index mark 55 Lens-side mount member
55a Insertion part 55b Engagement part
55c Slide rail 61 Movable ring
61a Rotating support protrusion 61b Rotating shaft
61c Dustproof projection 61d Connecting projection
63 Fixed ring 63a Movable ring pulling projection
63b Dust-proof door locking rail 65 Dust-proof door
65a Axle 65b Open / close control protrusion
71 Elastic body for closure 73 Elastic body for ring connection

Claims (6)

A lens barrel with an optical system;
In the interchangeable lens comprising: a lens-side mount member that is fixed to an end of the lens barrel that is mounted on the camera body and has an opening in the center.
In the lens barrel, in the vicinity of the lens-side mount member, a movable member that always covers the opening and retracts from the opening when attached to the camera body through the lens-side mount member. An interchangeable lens, wherein a dustproof mechanism is provided.   The dust-proof mechanism includes, as the movable member, a dust-proof door that opens and closes in conjunction with rotation of the lens barrel when the interchangeable lens is attached to or detached from the camera body. The interchangeable lens according to claim 1. The dustproof mechanism is
A movable ring rotatably disposed inside the lens barrel;
A stationary ring arranged to rotate with the lens barrel in the lens barrel;
Two dustproof doors provided with opening and closing control protrusions that are pivotally attached to the movable ring and protrude toward the fixed ring;
A closing elastic body for urging the dustproof door in the closing direction;
The interchangeable lens according to claim 2, comprising an elastic body for connecting the movable ring and the fixed ring. The lens-side mount member includes an opening that is an arcuate slide rail on an annular surface,
4. The interchangeable lens according to claim 3, wherein the movable ring includes a rotation support protrusion that is inserted into a slide rail of the lens-side mount member on a rear end surface. The movable ring includes two rotating shafts on which the dustproof door is pivotally mounted at a position that is substantially symmetrical from the center of the front end surface, and includes a dustproof door protrusion at a position near the two rotating shafts. And a connection projection connected to the fixed ring via an elastic body for ring connection,
The fixed ring includes a movable ring pulling protrusion to which the elastic body for connecting the ring is fixed to a rear end surface of the movable ring, and an opening / closing control protrusion of the dustproof door slides on the annular surface. Two openings as dustproof door locking rails are formed,
The closing elastic body has one end fixed to the dustproof door protrusion of the movable ring and the other end fixed to the opening / closing control protrusion of the dustproof door to urge the dustproof door in the closing direction,
5. The ring connecting elastic body according to claim 3, wherein one end of the ring connecting elastic body is fixed to the connecting protrusion of the movable ring and the other end is fixed to the movable ring pulling protrusion of the fixed ring. The interchangeable lens described in 1. A camera body including a camera-side mount member; and the interchangeable lens according to any one of claims 1 to 5,
The camera-side mount member includes a locking protrusion that locks with the rotation support protrusion of the movable ring within the slide rail of the lens-side mount member,
When the interchangeable lens is rotated in a state where the lens side mount member is inserted into the camera side mount member, the locking protrusion of the camera side mount member and the rotation support protrusion of the movable ring are locked. Then, the rotation support projection slides in the slide rail, and both the movable rings rotate in the lens barrel.

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