JP2018185474A - Lens barrel and interchangeable lens camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel and lens interchangeable type camera that can encapsulate opening of a lens barrel in a state with additional components largely reduced.SOLUTION: A lens barrel 10 comprises: a barrel body part 20; a barrel side mount part 50 that has a small diameter barrel part 53 smaller in a diameter than the barrel body part 20, in which an opening barrel side opening part 54 exists on an end part side of the small diameter barrel part 53; a rearward lens body 40 that has a rear side lens element 32 and a rearward lens frame 42, and closes an interior side of the barrel side mount part 50 so that an interior of the barrel body part 20 does not communicate with an exterior when not used; and an actuation mechanism 60 that moves the rearward lens 40 along an optical axis L direction. An inner diameter of the small diameter barrel part 53 is provided to be smaller than an outer diameter of the rearward lens body 40, and around the small diameter barrel part 53 of the barrel side mount part 50, an inside step surface 51 is provided on which the rearward lens body 40 directly or indirectly abuts.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lens barrel and a lens interchangeable camera.

  In a lens-interchangeable camera (lens-interchangeable camera) that captures a subject, a plurality of types of different lens barrels are exchanged from the camera body, thereby enabling photographing that meets various photographing conditions. The lens barrel described above incorporates an optical system including a plurality of lenses. However, when the lens barrel is removed from the camera body, dust may enter the lens barrel. This is shown in FIG.

  As shown in FIG. 12, the cylindrical body portion 2 of the lens barrel 1 is provided with a step-shaped mount portion 3 on the side attached to the camera body, and the mount portion 3 transmits a photographing light beam. There is an opening 4 for this purpose. Further, a focus lens 6 supported by the lens frame 5 is provided inside the cylindrical body portion 2 so as to be movable in the optical axis direction. Therefore, dust can easily enter the cylindrical body 2 through the opening 4 as indicated by the arrow P.

  As a configuration for preventing dust from entering the lens barrel as described above, for example, there are those shown in Patent Document 1 and Patent Document 2. Patent Document 1 discloses a configuration in which a cap for preventing dust from entering the mount portion is covered. Patent Document 2 discloses a configuration in which a shutter mechanism for sealing an opening of a lens barrel is provided.

JP2013-83720A JP 2011-17808 A

  However, in the configurations disclosed in Patent Document 1 and Patent Document 2, separate members such as a cap and a shutter mechanism are required to seal the opening. Therefore, the number of parts increases as much as these additional members are required, and the cost increases accordingly. In the configuration disclosed in Patent Document 2, it is necessary to attach a separate shutter mechanism. Therefore, a space for mounting the shutter mechanism is required, and the lens barrel is increased in size accordingly.

  The present invention is based on the above circumstances, and provides a lens barrel and a lens interchangeable camera capable of sealing the opening of the lens barrel in a state where the number of additional parts is greatly reduced. With the goal.

  In order to solve the above problems, according to a first aspect of the present invention, there is provided a lens barrel that includes a photographing optical system composed of a plurality of lens elements and is detachably attached to a camera body, A cylindrical body portion in which an imaging optical system is provided and a cylindrical body portion that is provided integrally with the cylindrical body portion and has a smaller diameter cylindrical portion than the cylindrical body portion, and on the camera body side on the end side of the small diameter cylindrical portion A lens barrel side mount portion having an opened lens barrel side opening, a rear lens element that is closest to the camera body side among the plurality of lens elements, and a rear lens frame that holds the rear lens element, A rear lens body that is provided inside the cylindrical body portion and closes the inner side of the lens barrel side mounting portion so that the inside of the cylindrical body portion does not communicate with the outside when not in use, and the rear lens body in the optical axis direction A drive mechanism that moves along The inner diameter of the small-diameter cylindrical part is smaller than the outer diameter of the rear lens body, and the rear lens body directly or indirectly abuts around the small-diameter cylindrical part in the lens barrel side mounting part. There is provided a lens barrel characterized in that a step surface is provided.

  Further, according to another aspect of the present invention, in the above-described invention, when the camera is not in use, the rear surface of the camera body side of the rear lens frame comes into contact with the internal step surface to close the inner side of the lens barrel side mount portion. Is preferable.

  Further, according to another aspect of the present invention, in the above-described invention, it is preferable that the rear lens element is in contact with the internal step surface when not in use, thereby closing the inner side of the lens barrel side mount portion.

  Further, according to another aspect of the present invention, in the above-described invention, the internal step surface is provided with a sealing convex portion that protrudes in a direction away from the camera body side. Of these, it is preferable that the rear side of the frame on the camera body side is in contact with the convex end surface that is the end surface on the protruding side of the sealing convex portion, thereby closing the inner side of the lens barrel side mounting portion.

  Further, according to another aspect of the present invention, in the above-described invention, the inner stepped surface is provided with a sealing recess that is recessed toward the camera body side, and the rear lens frame is directed toward the camera body side. It is preferable that a protruding portion that protrudes is provided, and that the protruding portion enters the sealing recess when not in use, thereby closing the inner side of the lens barrel side mounting portion.

  According to another aspect of the present invention, in the above-described invention, the internal step surface is provided with a fitting recess that is recessed toward the camera body side, and the fitting recess is formed of an elastic member. It is preferable that the sealing member is fitted and, when not in use, the rear side of the camera body side of the rear lens frame abuts the sealing member to close the inside of the lens barrel side mount portion.

  Further, according to another aspect of the present invention, in the above-described invention, an inward protruding portion that protrudes toward the camera body side from the rear surface of the frame is provided on the inner diameter side of the rear lens frame. It is preferable that the rear surface of the camera body side of the lens frame is in contact with the inner stepped surface, and the inward protruding portion enters the small-diameter cylindrical portion, thereby closing the inner side of the lens barrel side mounting portion.

  In order to solve the above problems, according to a second aspect of the present invention, there is provided a lens barrel that includes a photographing optical system composed of a plurality of lens elements and is detachably attached to the camera body. A cylindrical body portion in which a photographing optical system is provided, and a cylindrical body portion that is provided integrally with the cylindrical body portion and has a smaller diameter than the cylindrical body portion, and a camera body on the end side of the small diameter cylindrical portion A lens barrel side mount that has a lens barrel side opening, a rear lens element that is closest to the camera body among a plurality of lens elements, and a rear lens frame that holds the rear lens element. And a rear lens body provided inside the cylindrical body portion, a driving mechanism for moving the rear lens body along the optical axis direction, and a control means for controlling the driving of the driving mechanism, and the inner diameter of the small-diameter cylindrical portion. Is smaller than the outer diameter of the rear lens body An internal step surface is provided around the small-diameter cylindrical portion of the lens barrel-side mount portion so that the rear lens body directly or indirectly abuts, and the control means has reached the closing timing. If it is determined, the drive mechanism is driven so that the rear lens body directly or indirectly contacts the internal step surface, so that the inside of the cylindrical portion does not communicate with the outside. A lens barrel is provided that closes the inner side of the mount portion.

  Further, according to another aspect of the present invention, in the above-described invention, when it is determined that the drive mechanism is driven in a focus moving range that is a range in which the rear lens body is moved for focusing, and that the closing timing has arrived. Moves the rear lens body closer to the camera body than the focal point movement range by driving the drive mechanism, causing the rear lens body to directly or indirectly contact the internal step surface, and the inside of the cylindrical body portion to the outside It is preferable to close the inner side of the lens barrel side mount so as not to communicate with each other.

  Furthermore, in another aspect of the present invention, in the above-described invention, it is preferable that the control unit determines that the closing timing has arrived at the power-off timing of the camera body.

  According to another aspect of the present invention, in the above-described invention, the control means determines that the closing timing has arrived at a timing when the electrical connection between the camera body and the lens barrel is detected. Is preferable.

  Furthermore, in another aspect of the present invention, in the above-described invention, it is preferable that the control unit determines that the closing timing has arrived when the release button for removing the lens barrel from the camera body is pressed.

  Furthermore, another aspect of the present invention is an interchangeable lens system comprising: the lens barrel according to each of the above-described inventions; and a camera body including a body-side mount portion to which the lens barrel is detachably attached. A camera is provided.

  According to the present invention, it is possible to provide a lens barrel and a lens interchangeable camera that can seal the opening of the lens barrel in a state where the number of additional parts is greatly reduced.

It is a schematic diagram which shows the structure of the lens barrel and lens interchangeable camera which concern on one embodiment of this invention. The figure which shows the focus moving range which is a range which moves a back lens frame and a rear side lens element for focusing, and the image of the control constitution of a lens interchangeable camera concerning one embodiment of this invention. It is. It is a schematic enlarged view which shows the structure of the dustproof mechanism which concerns on a 1st structural example. It is a schematic enlarged view which shows the structure of the dustproof mechanism which concerns on a 2nd structural example. It is a schematic enlarged view which shows the structure of the dustproof mechanism which concerns on a 3rd structural example. It is a schematic enlarged view which shows the structure of the dustproof mechanism which concerns on a 4th structural example. It is a schematic enlarged view which shows the structure of the dustproof mechanism which concerns on a 5th structural example. It is a schematic enlarged view which shows the structure of the dustproof mechanism which concerns on a 6th structural example. It is a perspective view which shows the structure of the lens barrel which concerns on the modification of this invention. It is a schematic enlarged view which shows the structure of the dustproof mechanism which concerns on the modification of a 1st structural example. It is a schematic enlarged view which shows the structure of the dustproof mechanism which concerns on the modification of a 6th structural example. It is a figure which shows the image which dust penetrate | invades in the inside of the lens barrel of a conventional structure.

  Hereinafter, a lens barrel 10 and an interchangeable lens camera 11 according to an embodiment of the present invention will be described with reference to the drawings. In the following description, in the extending direction (X direction) of the optical axis L of the imaging optical system 30 of the lens barrel 10, the subject side is the front side (X1 side), and the camera body 100 side is the rear side (X2 side). To do. In the direction orthogonal to the optical axis L (Y direction), the direction approaching the optical axis L is defined as the inside, and the direction away from the optical axis L is defined as the outside. Further, the circumferential direction around the optical axis L is defined as the circumferential direction.

<Basic Configuration of Lens Barrel 10 and Interchangeable Lens Camera 11>
Hereinafter, basic configurations of the lens barrel 10 and the interchangeable lens camera 11 according to an embodiment of the present invention will be described below. FIG. 1 is a schematic diagram showing the configuration of a lens barrel 10 and an interchangeable lens camera 11 according to an embodiment of the present invention.

  The lens barrel 10 of the present embodiment constitutes an interchangeable lens camera 11 by being attached to a camera body 100 (corresponding to the body). An image sensor 110 is provided inside the camera body 100. Subject light is imaged on the image sensor 110 via the imaging optical system of the lens barrel 10, and the subject light is converted into an electric signal by performing photoelectric conversion on the image sensor 110.

  The camera body 100 is provided with a body-side mount portion 120 to which the lens barrel 10 is attached. The body-side mount portion 120 has a body-side opening 130 formed therein. The main body side opening 130 is an opening for allowing subject light from the lens barrel 10 to enter the image sensor 110. In addition, the camera main body 100 also includes a main body control unit 140 (see FIG. 2). The main body control unit 140 is a part that controls the overall operation of the interchangeable lens camera 11. The main body control unit 140 can be configured by a microcomputer including an external memory such as a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and a nonvolatile memory.

  The lens barrel 10 includes a cylindrical body 20 and an imaging optical system 30. The cylindrical portion 20 is a cylindrical cylindrical portion that supports the imaging optical system 30 and protects it from the outside. This cylinder part 20 may be comprised from the some cylinder member. In the case where the cylindrical body portion 20 is composed of a plurality of cylindrical members, cam grooves, cam followers, and the like are provided between the cylindrical members, and the cylindrical members are optically engaged by engagement between the cam grooves and the cam followers. Advances and retracts in the direction of the axis L. Thereby, the distance between the lens elements between the imaging optical systems 30 varies.

  In addition, when the cylinder part 20 is comprised from a some cylinder member, it is good also as a structure provided with the zoom function which can change a focal distance in a fixed range, but it is good also as a structure which is not provided with a zoom function.

  Further, the imaging optical system 30 includes a plurality of lens elements, and makes it possible to form an image of subject light that has passed through the plurality of lens elements on the imaging element 110 at a predetermined magnification. Here, at least one lens element of the imaging optical system 30 is located on the most front side (X1 side), and the cylindrical body portion 20 can be sealed from the front side (X1 side). In the following description, the lens element located on the most front side (X1 side) is referred to as a front lens element 31. The front lens element 31 is held by a front lens frame 41, and the front lens frame 41 is fixedly attached to an inner wall surface on the front side (X1 side) of the cylindrical body portion 20.

  On the other hand, at least one lens element of the imaging optical system 30 is movable along the optical axis L in order to focus the subject light by focusing it on the imaging element 110. For example, in FIG. 1, the lens element on the rearmost side (X2 side) is movable along the optical axis L. However, other lens elements of the image sensor 110 may be movable. In the following description, the rear lens element that moves along the optical axis L is referred to as a rear lens element 32.

  The rear lens element 32 does not use all of the area for photographing. That is, the rear lens element 32 is provided with a use area 321 where subject light is incident upon shooting and is emitted toward the image sensor 110. In addition, on the outer diameter side of the use area 321 in the rear lens element 32, there is a non-use area 322 where no subject light is incident or no subject light is emitted toward the image sensor 110 even when the subject light is incident. Is provided.

  Note that the non-use area 322 side of the rear lens element 32 is attached to the rear lens frame 42. The rear lens frame 42 moves along the optical axis L by driving a motor 60 described later.

  FIG. 2 is a diagram showing a focus moving range M that is a range in which the rear lens frame 42 and the rear lens element 32 are moved for focusing, and an image of a control configuration of the interchangeable lens camera 11. . As shown in FIG. 2, the rear lens element 32 and the rear lens frame 42 can focus the subject image on the image sensor 110 within a predetermined focus movement range M. ing. In the following description, since the rear lens element 32 and the rear lens frame 42 move integrally, they are collectively referred to as a rear lens body 40.

  On the other hand, the rear lens body 40 can be moved rearward (X2 side) beyond the focus movement range M described above. In a state where the rear lens body 40 is located on the most rear side (X2 side), a sealed state for dust prevention can be realized.

  The lens barrel 10 is provided with a barrel-side mount portion 50 that is attached to the camera body 100. As shown in FIG. 1, the lens barrel side mount portion 50 has a cylindrical portion (small diameter cylindrical portion 53) having a smaller diameter than the cylindrical body portion 20. Due to the difference in inner diameter between the cylindrical body portion 20 and the small diameter cylindrical portion 53, the lens barrel side mount portion 50 has an internal step surface 51 that faces the rear lens frame 42 inside the cylindrical body portion 20. The lens barrel side mount 50 also has an external step 52 that faces the camera body 100. The small-diameter cylindrical portion 53 protrudes toward the rear side (X2 side) from the internal step surface 51 and the external step portion 52, and the small-diameter cylindrical portion 53 is inserted into the main body side opening 130 by the protrusion. It has become a part.

  In addition, the rear side (X2 side) of the small-diameter cylindrical portion 53 is not closed with respect to the camera body 100 and is open so as to communicate with the inside of the camera body 100. In the following description, this opening portion is referred to as a lens barrel side opening 54.

  In addition, from the outer peripheral side of the small diameter cylinder part 53, the engaging part 55 protrudes to the outer diameter side. The engaging portion 55 prevents the lens barrel side mount portion 50 from being detached from the main body side mount portion 120 when the lens barrel side mount portion 50 is attached to the main body side mount portion 120. The engaging portion 55 is, for example, a bayonet type. However, in addition to the bayonet type, a screw type in which a male screw part is formed on one of the main body side mount part 120 and the lens barrel side mount part 50 and a female screw part is formed on the other side may be used. A method may be adopted.

  An image in which the rear lens body 40 moves is shown in FIG. As shown in FIG. 2, the rear lens frame 42 is connected to a drive transmission member 61 such as a lead screw in a state where the drive force can be transmitted (for example, a state in which the drive force is engaged). The drive transmission member 61 is rotated by driving of the motor 60, and the rear lens body 40 moves along the optical axis L by the rotation.

  In addition, the drive transmission member 61 is not restricted to a structure like a lead screw. For example, a cam groove having a direction component in the optical axis L direction is formed in the cylindrical member of the cylindrical body portion 20, and the cam groove and the rear lens frame 42 are engaged. Then, the rear lens frame 42 may be moved in the optical axis L direction by the inclined surface of the cam groove by rotating the cylindrical member having the cam groove by the motor 60 or manually.

  As the motor 60, for example, various motors such as a stepping motor, an ultrasonic motor, and a DC motor can be used. In addition, a piezo actuator using a piezoelectric element may be included in the concept of the motor 60. The motor 60 corresponds to a drive mechanism. The rotation of the motor 60 is controlled based on the control by the lens control unit 70. The lens control unit 70 can be configured by a microcomputer including an external memory such as a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and a nonvolatile memory. The lens control unit 70 corresponds to control means.

  The lens control unit 70 exists in the lens barrel 10 and can transmit and receive electrical signals to and from the main body control unit 140 on the camera main body 100 side. The lens control unit 70 can control the driving of the motor 60 based on the reception of an electrical signal from the main body control unit 140. The lens control unit 70 may control the motor 60 without being based on reception of an electrical signal from the main body control unit 140. In addition, although this lens control part 70 exists in the lens-barrel 10, you may employ | adopt the structure which exists in the camera main body 100 side.

  As shown in FIG. 2, the lens control unit 70 is electrically connected to a power button 71 and a release button 72. When the power button 71 is pressed to turn the power off or on, an electrical signal related to the power off or power on is supplied to the lens control unit 70. Further, when the lens barrel 10 is detached from the camera body 100 by pressing the release button 72, an electrical signal to that effect is supplied to the lens controller 70.

  The lens barrel 10 is provided with a dustproof mechanism 80. The dustproof mechanism 80 is a mechanism for preventing dust from entering the lens barrel 10 from the lens barrel side opening 54. The dust-proof mechanism 80 is composed mainly of the rear lens element 32, the rear lens frame 42, the lens barrel-side mount 50, the drive transmission member 61, and the motor 60. The other components constitute the dust-proof mechanism 80. Of course, it may be. In the following description, each structural example of the dustproof mechanism 80 will be described.

<First configuration example of dust-proof mechanism>
Hereinafter, the 1st structural example of the dustproof mechanism 80 in this Embodiment is demonstrated below. In addition, about the dustproof mechanism 80 which concerns on a 1st structural example, suppose that the alphabet "A" is attached | subjected to the code | symbol which shows each member.

  FIG. 3 is a schematic enlarged view showing the configuration of the dustproof mechanism 80A according to the first configuration example of the present embodiment. In the dustproof mechanism 80A according to the first configuration example, the rear lens element 32A does not come into contact with the internal step surface 51A, and the frame rear surface 42A1 of the rear lens frame 42A is entirely circumferential with respect to the internal step surface 51A. It is the structure which contacts (per degree) over. The frame rear surface 42A1 refers to the rear (X2 side) surface of the rear lens frame 42A.

  The lens barrel side opening 54 is closed from the inner side (X1 side) by the abutment of the frame rear surface 42A1 to the inner stepped surface 51A, and the lens barrel 10A has the rear lens body 40A (the rear lens frame 42A and the rear lens frame 42A). The rear lens element 32A) is sealed from the outside. Therefore, even when the lens barrel 10A is detached from the interchangeable lens camera 11, dust can be prevented from entering the lens barrel 10A.

  Here, the contact between the frame rear surface 42A1 and the inner stepped surface 51A may be any contact mode as long as dust can be prevented from entering the lens barrel 10A. For example, the frame rear surface 42A1 and the inner stepped surface 51A may be in contact with each other with high surface accuracy (for example, high enough to perform a waterproof function), and to the extent that dust can be prevented from entering. You may contact | abut in a low state.

  In order to realize the contact (per degree) of the frame rear surface 42A1 to the internal step surface 51A, the lens control unit 70 drives the motor 60 when it is determined that the closing timing has come, and FIG. The rear lens element 32A and the rear lens frame 42A are moved until the frame rear surface 42A1 of the rear lens frame 42A is in contact with the internal step surface 51A beyond the focus movement range M as shown.

  The closing timing may be, for example, when the power switch 71 is pressed to turn off the interchangeable lens camera 11 or when the lens barrel 10A is removed from the camera body 100 in the interchangeable lens camera 11. It may be when the release button 72 is pressed. Even when the interchangeable lens camera 11 is not turned off, the closing timing may be set when the energy saving mode (energy saving mode) for suppressing power consumption is reached after a predetermined time has elapsed. Further, although the motor 60 can be driven, the closing timing may be when the supply of an electrical signal from the camera body 100 side to the lens barrel 10A is interrupted. Furthermore, the timing at which the lens control unit 70 detects that the electrical connection between the camera body 100 and the lens barrel 10A is disconnected may be used as the closing timing.

  In such a first configuration example, it is possible to prevent dust from entering the lens barrel 10 </ b> A from the outside by the frame rear surface 42 </ b> A <b> 1 abutting (per unit) on the inner step surface 51 </ b> A.

<Second configuration example of dust-proof mechanism>
Hereinafter, a second configuration example of the dustproof mechanism 80 according to the present embodiment will be described. In addition, about the dustproof mechanism 80 which concerns on a 2nd structural example, suppose that an alphabet "B" is attached | subjected to the code | symbol which shows each member.

  FIG. 4 is a schematic enlarged view showing the configuration of the dustproof mechanism 80B according to the second configuration example of the present embodiment. In the dustproof mechanism 80B according to the second configuration example, the frame rear surface 42B1 of the rear lens frame 42B does not contact the internal step surface 51B, and the unused region 322 of the rear lens element 32B is in contrast to the internal step surface 51B. , It is configured to abut (per degree) over the entire circumference in the circumferential direction. However, a configuration in which the frame rear surface 42B1 contacts the internal step surface 51B when the rear lens element 32B contacts the internal step surface 51B may be employed. The rear lens element 32B comes into contact with the edge of the internal step surface 51B, so that the inside of the lens barrel 10B is sealed from the outside. Therefore, even when the lens barrel 10B is detached from the interchangeable lens camera 11, dust can be prevented from entering the lens barrel 10B.

  As in the case of the first configuration example described above, any form of contact between the rear lens element 32B and the internal step surface 51B may be used.

  Further, the control of the motor 60 in the lens control unit 70 for realizing the contact of the rear lens element 32B with the inner stepped surface 51B is the same as that described in the first configuration example. can do.

  Also in such a second configuration example, the rear lens element 32B abuts (per degree) on the internal step surface 51B, thereby preventing dust from entering the lens barrel 10B from the outside. .

<Third configuration example of dust-proof mechanism>
Hereinafter, the 3rd structural example of the dustproof mechanism 80 in this Embodiment is demonstrated below. In addition, about the dustproof mechanism 80 which concerns on a 3rd structural example, suppose that an alphabet "C" is attached | subjected to the code | symbol which shows each member.

  FIG. 5 is a schematic enlarged view showing the configuration of a dustproof mechanism 80C according to the third configuration example of the present embodiment. In the dustproof mechanism 80C according to the third configuration example, a sealing convex portion 56C is provided on the internal step surface 51C. The sealing convex portion 56C protrudes to the front side (X1 side) from the other portion of the internal step surface 51C. The frame rear surface 42C1 of the rear lens frame 42C abuts over the entire circumference in the circumferential direction with respect to the projecting side surface (X1 side surface; convex end surface 56C1) of the sealing convex portion 56C. It is a structure to hit.

  Here, the contact between the frame rear surface 42C1 and the convex end surface 56C1 may be in any form as long as dust can be prevented from entering the lens barrel 10C. In the third configuration example, for example, the surface accuracy is increased by increasing the surface accuracy so that the convex end surface 56C1 of the sealing convex portion 56C is smooth without increasing the surface accuracy of the entire internal step surface 51C. The processing time and cost for making it high can be reduced.

  In the dustproof mechanism 80C of the third configuration example, when the convex end surface 56C1 is formed smoothly, the adhesion between the frame rear surface 42C1 and the convex end surface 56C1 can be improved. Thereby, it is possible to more reliably prevent dust from entering the lens barrel 10C. Further, by providing the sealing convex portion 56C, a gap can be provided between the rear lens element 32C and the internal step surface 51C. Therefore, it is possible to prevent the rear lens element 32C from coming into contact with the internal step surface 51C. Accordingly, it is possible to prevent the rear lens element 32C from being damaged, and it is possible to prevent deterioration of the optical performance of the rear lens element 32C. Furthermore, by providing the sealing convex portion 56C, the moving distance to the rear side (X2 side) of the rear lens element 32C and the rear lens frame 42C can be reduced.

<Fourth configuration example of dust-proof mechanism>
Hereinafter, a fourth configuration example of the dustproof mechanism 80 in the present embodiment will be described below. In addition, about the dustproof mechanism 80 which concerns on a 4th structural example, suppose that an alphabet "D" is attached | subjected to the code | symbol which shows each member.

  FIG. 6 is a schematic enlarged view showing the configuration of a dustproof mechanism 80D according to a fourth configuration example of the present embodiment. In the dustproof mechanism 80D according to the fourth configuration example, a sealing recess 57D is provided on the inner step surface 51D so as to cover the entire circumference in the circumferential direction. The sealing recess 57D is a portion that is recessed more concavely than other portions of the internal step surface 51D.

  Further, the rear lens frame 42D is provided with a protruding portion 42D1 so as to extend over the entire circumference in the circumferential direction. The protruding portion 42D1 is a portion that protrudes from the rear lens frame 42D to the camera body 100 side (X2 side), and is a portion that enters the sealing recess 57D. Due to the protrusion 42D1 entering the sealing recess 57D, dust can be prevented from entering the lens barrel 10D.

  Here, the protrusion 42D1 enters the sealing recess 57D with a slight gap in a direction (Y direction) orthogonal to the extending direction (X direction) of the optical axis L. That is, in the portion where the rear lens frame 42D is slid, slight backlash and dimensional error occur due to backlash with the drive transmission member 61, other assembly errors, manufacturing tolerances, and the like. It is normal. Therefore, if the protrusion 42D1 enters the sealing recess 57D with almost no gap, the protrusion 42D1 does not enter the sealing recess 57D due to the slight displacement described above, and the sealing recess 57D. May collide with the inner stepped surface 51D around. Therefore, even when the protrusion 42D1 enters the sealing recess 57D, there is a slight gap between them.

  In the dustproof mechanism 80D of the fourth configuration example, the bottom surface 57D1 of the sealing recess 57D can be provided smoothly, and the protruding end surface 42D2 (rear surface; X2 surface) of the protruding portion 42D1 is also smooth. Can be provided. In the case where the bottom surface 57D1 of the sealing recess 57D and the protruding end surface 42D2 are smooth, the adhesion between them can be improved. Thereby, it is possible to more reliably prevent dust from entering the lens barrel 10D. Further, when the protrusion 42D1 enters the sealing recess 57D, a path for the dust to enter the lens barrel 10D becomes longer, and accordingly, the dust becomes more difficult to enter the lens barrel 10D.

  Further, the protruding length of the protruding portion 42D1 can be made longer than the depth of the sealing recess 57D. When the protrusion length of the protrusion 42D1 is made longer than the depth of the sealing recess 57D, it is possible to prevent a portion other than the protrusion 42D1 of the rear lens frame 42D from colliding with the internal step surface 51D. Therefore, it is possible to prevent the rear lens element 32D from being damaged, and it is possible to prevent deterioration of the optical performance of the rear lens element 32D.

<Fifth configuration example of dust-proof mechanism>
Hereinafter, a fifth configuration example of the dustproof mechanism 80 in the present embodiment will be described below. In addition, about the dustproof mechanism 80 which concerns on a 5th structural example, suppose that an alphabet "E" is attached | subjected to the code | symbol which shows each member.

  FIG. 7 is a schematic enlarged view showing the configuration of a dustproof mechanism 80E according to the fifth configuration example of the present embodiment. In the dustproof mechanism 80E according to the fifth configuration example, the inner stepped surface 51E is provided with a fitting recess 58E so as to cover the entire circumference in the circumferential direction. A ring-shaped sealing member 90E is fitted into the fitting recess 58E. Sealing member 90E is formed of an elastic member such as an O-ring, for example. The sealing member 90E comes into contact with the rear surface 42E1 of the rear lens frame 42E in a state where an urging force is applied from the front side (X1 side) to the rear side (X2 side). Then, the sealing member 90E is slightly elastically deformed, thereby improving the adhesion between the frame rear surface 42E1 and the sealing member 90E.

  Thus, in the dustproof mechanism 80E of the fifth configuration example, it is possible to prevent dust from entering the lens barrel 10E due to the close contact between the frame rear surface 42E1 and the sealing member 90E. Further, since the sealing member 90E is made of an elastic member, even if the rear lens frame 42E collides with the sealing member 90E, the impact can be reduced.

<Sixth configuration example of dust-proof mechanism>
Hereinafter, a sixth configuration example of the dustproof mechanism 80 in the present embodiment will be described below. In addition, about the dustproof mechanism 80 which concerns on a 6th structural example, suppose that the alphabet "F" is attached | subjected to the code | symbol which shows each member.

  FIG. 8 is a schematic enlarged view showing a configuration of a dustproof mechanism 80F according to a sixth configuration example of the present embodiment. In the dust-proof mechanism 80F according to the sixth configuration example, as in the dust-proof mechanism 80A according to the first configuration example, the dust-proof mechanism 80F contacts (per degree) the internal step surface 51F of the rear lens frame 42F. However, the shape of the rear lens frame 42F is different from the shape of the rear lens frame 42A according to the first configuration example. Specifically, on the inner diameter side of the rear lens frame 42F, an inward protruding portion 42F3 that protrudes toward the rear side (X2 side) from the frame rear surface 42F1 is provided. The inward protruding portion 42F3 is provided so as to extend over the entire circumference in the circumferential direction of the rear lens frame 42F.

  Here, the frame rear surface 42F1 of the rear lens frame 42F is in contact with the internal step surface 51F. On the other hand, the inward protruding portion 42F3 enters the lens barrel side opening portion 54F so as to be located on the rear side (X2 side) from the internal stepped surface 51F. In this entry, the inward protrusion 42F3 enters the inner peripheral wall 54F1 of the lens barrel side opening 54F with a slight gap, in the same manner as the protrusion 42D1 enters the sealing recess 57D. As a result, at the part where the rear lens frame 42F is slid, there is a slight backlash between the drive transmission member 61 and the rear lens frame 42F, or other effects due to assembly errors, manufacturing tolerances, etc. Dimensional errors can be absorbed.

  As described above, in the dust prevention mechanism 80F of the sixth configuration example, it is possible to more reliably prevent dust from entering the lens barrel 10F due to the inward protrusion 42F3 entering the small diameter cylinder portion 53F. Even if the thickness (dimension in the X direction) of the rear lens frame 42F is reduced, the strength of the rear lens frame 42F can be ensured by the presence of the inward protruding portion 42F3 in the rear lens frame 42F. . Therefore, the rear lens frame 42F can be reduced in thickness, thereby increasing the range in which the rear lens element 32F can move. Thus, by increasing the movement range of the rear lens element 32F, the degree of freedom in optical design can be improved.

<About effect>
The lens barrel 10 of the first to sixth configuration examples of the present embodiment as described above includes the imaging optical system 30 including a plurality of lens elements and is detachable from the camera body 100. The lens barrel 10 to be attached includes a cylindrical body portion 20 in which the imaging optical system 30 is provided, and a small-diameter cylindrical portion 53 that is provided integrally with the cylindrical body portion 20 and has a smaller diameter than the cylindrical body portion 20. At the same time, the lens barrel side mount portion 50 having the lens barrel side opening 54 opened to the camera body 100 side on the end side of the small diameter cylinder portion 53 and the rear of the plurality of lens elements closest to the camera body 100 side. It has a side lens element 32 and a rear lens frame 42 that holds the rear lens element 32, and is provided inside the cylindrical body portion 20 so that the inside of the cylindrical body portion 20 does not communicate with the outside when not in use. To the lens barrel side A rear lens body 40 that closes the inner side of the rear portion 50, and a drive mechanism (motor 60) that moves the rear lens body 40 along the optical axis L direction. The inner diameter of the small-diameter cylindrical portion 53 is the rear lens body. An inner step surface 51 is provided around the small-diameter cylindrical portion 53 of the lens barrel-side mount portion 50 so that the rear lens body 40 abuts directly or indirectly. Yes.

  As described above, the inner diameter of the small-diameter cylindrical portion 53 is smaller than the outer diameter of the rear lens body 40, and the rear lens body 40 is disposed around the small-diameter cylindrical portion 53 in the lens barrel-side mount portion 50. An internal step surface 51 that abuts directly or indirectly is provided. Therefore, when the lens barrel 10 is not used, the rear lens body 40 can close the end side (X1 side) of the small-diameter cylindrical portion 53 by moving the rear lens body 40 by the drive mechanism (motor 60) (mirror). The inner side (X1 side) of the cylinder side mount part 50 can be closed). Accordingly, it is possible to seal the lens barrel 10 with the additional parts greatly reduced. Accordingly, it is possible to prevent dust from entering the lens barrel 10.

  Further, in the first configuration example of the present embodiment, the frame rear surface 42A1 on the camera body 100 side of the rear lens body 40A abuts the internal step surface 51A when not in use, so that the inner side of the lens barrel side mount 50A Can be occluded.

  In this configuration, the frame rear surface 42A1 contacts the internal step surface 51A, so that the rear lens element 32A does not need to contact the internal step surface 51A. Thereby, it becomes possible to prevent the rear lens element 32A from being damaged, and it is possible to prevent deterioration of the optical performance of the rear lens element 32A.

  Furthermore, in the second configuration example of the present embodiment, the inner side of the lens barrel side mount portion 50B can be closed by the rear lens element 32B contacting the inner step surface 51B when not in use.

  In the case of this configuration, the rear lens element 32B contacts (per degree) the internal step surface 51B, thereby preventing dust from entering the lens barrel 10B from the outside. Therefore, it is not necessary to change the inner diameter of the rear lens element 32B even in the small-diameter cylindrical portion 53B having a small inner diameter. Further, by setting the portion of the rear lens element 32B that is in contact (per contact) with the internal stepped surface 51B as the non-use area 322, the lens surface of the rear lens element 32B directly contacts another member. Even if the contact is made, it is possible to prevent the optical performance from being affected so as to affect the photographing.

  Further, in the third configuration example of the present embodiment, the inner stepped surface 51C is provided with a sealing convex portion 56C that protrudes in a direction away from the camera body 100 side, and the rear lens frame when not in use. The frame rear surface 42C1 on the camera body 100 side in 42C abuts on the convex end surface 56C1, which is the end surface on the protruding side of the sealing convex portion 56C, so that the inner side of the lens barrel side mount portion 50C can be closed.

  In the case of this configuration, by forming the convex end surface 56C1 smoothly, the adhesion between the frame rear surface 42C1 and the convex end surface 56C1 can be enhanced. Thereby, it is possible to more reliably prevent dust from entering the lens barrel 10C. Further, by providing the sealing convex portion 56C, a gap can be provided between the rear lens element 32C and the internal step surface 51C. Therefore, it is possible to prevent the rear lens element 32C from coming into contact with the internal step surface 51C. Accordingly, it is possible to prevent the rear lens element 32C from being damaged, and it is possible to prevent deterioration of the optical performance of the rear lens element 32C. Furthermore, by providing the sealing convex portion 56C, the moving distance to the rear side (X2 side) of the rear lens element 32C and the rear lens frame 42C can be reduced.

  Furthermore, in the fourth configuration example of the present embodiment, the inner stepped surface 51D is provided with a sealing recess 57D that is recessed toward the camera body 100 side, and the rear lens frame 42D has the camera body 100 side. The projecting portion 42D1 projecting toward the front is provided, and the projecting portion 42D1 enters the sealing recess 57D when not in use, thereby closing the inner side of the lens barrel side mount portion 50D.

  In the case of this configuration, the bottom surface 57D1 of the sealing recess 57D can be provided smoothly, and the protruding end surface 42D2 (rear surface; X2 surface) of the protruding portion 42D1 can also be provided smoothly. In that case, both adhesiveness can be improved. Thereby, it is possible to more reliably prevent dust from entering the lens barrel 10D. Further, when the protrusion 42D1 enters the sealing recess 57D, a path for the dust to enter the lens barrel 10D becomes longer, and accordingly, the dust becomes more difficult to enter the lens barrel 10D.

  In the fifth configuration example of the present embodiment, the internal stepped surface 51E is provided with a fitting recess 58E that is recessed toward the camera body 100, and the fitting recess 58E is formed of an elastic member. When the sealing member 90E is fitted and the frame rear surface 42E1 on the camera body 100 side of the rear lens frame 42E is in contact with the sealing member 90E when not in use, the inner side of the lens barrel side mount portion 50E is closed. be able to.

  In the case of this configuration, it is possible to prevent dust from entering the lens barrel 10E due to the close contact between the frame rear surface 42E1 and the sealing member 90E. Further, since the sealing member 90E is made of an elastic member, even if the rear lens frame 42E collides with the sealing member 90E, the impact can be reduced.

  Furthermore, in the sixth configuration example of the present embodiment, an inner projecting portion 42F3 that projects toward the camera body 100 side from the frame rear surface 42F1 is provided on the inner diameter side of the rear lens frame 42F. Sometimes, the rear surface 42F1 on the camera body 100 side of the rear lens frame 42F is in contact with the inner stepped surface 51F, and the inwardly projecting portion 42F3 enters the small diameter cylindrical portion 53F, so that the inner side of the lens barrel side mounting portion 50F is disposed. Can be occluded.

  In the case of this configuration, the intrusion of the inward protruding portion 42F3 into the small diameter cylindrical portion 53F can more reliably prevent dust from entering the lens barrel 10F. Even if the thickness (dimension in the X direction) of the rear lens frame 42F is reduced, the strength of the rear lens frame 42F can be ensured by the presence of the inward protruding portion 42F3 in the rear lens frame 42F. . Therefore, the rear lens frame 42F can be reduced in thickness, thereby increasing the range in which the rear lens element 32F can move. Thus, by increasing the movement range of the rear lens element 32F, the degree of freedom in optical design can be improved.

  The lens barrel 10 of the first to sixth configuration examples of the present embodiment includes an imaging optical system 30 including a plurality of lens elements and is detachably attached to the camera body 100. The lens barrel 10 includes a cylindrical body portion 20 in which an imaging optical system 30 is provided, a cylindrical body portion 20 provided integrally with the cylindrical body portion 20, and a small diameter cylindrical portion 53 having a smaller diameter than the cylindrical body portion 20. A lens barrel side mount portion 50 having a lens barrel side opening 54 opened to the camera body 100 side on the end side of the small diameter cylinder portion 53, and a rear lens closest to the camera body 100 side among the plurality of lens elements. The rear lens frame 40 that has the element 32 and the rear lens element 32 that holds the rear lens element 32, and that moves the rear lens body 40 along the optical axis L direction. Mechanism (motor 0) and control means (lens control unit 70) for controlling the driving of the drive mechanism (motor 60), and the inner diameter of the small-diameter cylindrical portion 53 is provided smaller than the outer diameter of the rear lens body 40, An inner step surface 51 with which the rear lens body 40 abuts directly or indirectly is provided around the small-diameter tube portion 53 in the lens barrel side mount portion 50, and the control means (lens control portion 70) When it is determined that the closing timing has arrived, the drive mechanism (motor 60) is driven so that the rear lens body 40 directly or indirectly abuts against the internal step surface 51, whereby the inside of the cylindrical body portion 20 The inner side of the lens barrel side mount portion 50 is closed so as not to communicate with the outside.

  As described above, when it is determined that the closing timing has arrived, the control unit (lens control unit 70) drives the drive mechanism (motor 60) so that the rear lens body 40 is directly or indirectly connected to the internal step surface. 51. Thereby, the inner side of the lens barrel side mount part 50 is closed so that the inside of the cylindrical body part 20 does not communicate with the outside. Further, the inner diameter of the small-diameter cylindrical portion 53 is set smaller than the outer diameter of the rear lens body 40. Therefore, when the control means (the lens control unit 70) determines that the closing timing has arrived, the end side (X1 side) of the small-diameter cylindrical portion 53 can be closed by the rear lens body 40. Therefore, it is possible to seal the lens barrel with the additional parts greatly reduced. Accordingly, it is possible to prevent dust from entering the lens barrel 10.

  Furthermore, the lens barrel 10 of the first to sixth configuration examples of the present embodiment has a drive mechanism (motor 60) in a focus movement range M that is a range in which the rear lens body 40 is moved for focusing. When it is determined that the closing timing has been reached, the rear lens body 40 is directly moved by moving the rear lens body 40 to the camera body 100 side of the focus movement range M by driving the drive mechanism (motor 60). The inner side of the lens barrel side mount part 50 can be closed so as to contact the inner stepped surface 51 intentionally or indirectly so that the inside of the cylindrical body part 20 does not communicate with the outside.

  As described above, when it is determined that the closing timing has arrived, the rear lens body 40 is moved by moving the rear lens body 40 toward the camera main body 100 from the focal point movement range M by driving the drive mechanism (motor 60). Are directly or indirectly brought into contact with the inner stepped surface 51. Therefore, it is possible to close the inner side of the lens barrel side mount portion 50 so that the inside of the cylindrical body portion 20 does not communicate with the outside, thereby preventing dust from entering the lens barrel 10. It becomes.

  Further, in the lens barrel 10 of the first to sixth configuration examples of the present embodiment, the control means (lens control unit 70) determines that the closing timing has arrived at the power-off timing of the camera body 100. can do.

  In this way, the control means (the lens control unit 70) determines that the closing timing has arrived at the power-off timing of the camera body 100, so that when the power is turned off, the interior of the lens barrel 10 is located behind the rear lens body. It can be set as the state obstructed by 40. Therefore, even if the lens barrel 10 is removed from the camera body 100 after the power is turned off, it is possible to prevent dust from entering the lens barrel 10.

  Further, in the lens barrel 10 of the first to sixth configuration examples of the present embodiment, the control means (lens control unit 70) is electrically connected between the camera body 100 and the lens barrel 10. The timing at which the disconnection is detected can be determined as the closing timing has arrived.

  As described above, the control means (lens control unit 70) determines that the closing timing has arrived at the timing at which the electrical connection between the camera body 100 and the lens barrel 10 is disconnected. When the lens barrel 10 is removed from the main body 100 for some reason (for example, dropping or forcibly removing the interchangeable lens 11), the inside of the lens barrel 10 is blocked by the rear lens body 40. It is possible to prevent dust from entering the lens barrel 10.

  Further, in the lens barrel 10 of the first to sixth configuration examples of the present embodiment, the control means (lens control unit 70) has a release button 72 for removing the lens barrel 10 from the camera body 100. It can be determined that the closing timing has arrived at the pressed timing.

  Thus, even when the lens barrel 10 is detached from the camera body 100, the control means (lens control unit 70) determines that the closing timing has arrived when the release button 72 is pressed. It is possible to reliably prevent dust from entering the inside.

  Furthermore, the interchangeable lens camera 11 of the present embodiment includes a lens barrel 10 and a camera body 100 including a body-side mount portion 120 to which the lens barrel 10 is detachably attached. Accordingly, it is possible to seal the lens barrel 10 with the additional parts greatly reduced. Accordingly, it is possible to prevent dust from entering the lens barrel 10.

<Modification>
Although one embodiment of the present invention has been described above, the present invention can be variously modified in addition to this. This will be described below.

  In the above-described embodiment, the rear lens body 40 is moved by driving the motor 60. However, the rear lens body 40 may be moved without being driven by the motor 60. FIG. 9 shows an example of such a configuration. FIG. 9 is a perspective view showing a configuration of a lens barrel 10G according to a modification of the present invention. In the configuration shown in FIG. 9, an elongated slit 21G is formed in the cylindrical portion 20G, and a sliding knob 22G is inserted through the slit 21G. One end side of the sliding knob 22G is exposed to the outside from the slit 21G, and can slide along the long hole-shaped slit 21G as the user's finger slides.

  On the other hand, the other end side of the sliding knob 22G is directly or indirectly connected to the rear lens body 40 (not shown) via another member. When the sliding knob 22G is positioned on the rear side (X2 side) of the long hole-shaped slit 21G, the rear lens body 40 moves beyond the focal point movement range M to the rear side (X2 side). Accordingly, a sealed state for dust prevention can be realized, and the opening of the lens barrel 10 can be sealed. For this reason, it becomes possible to prevent dust from entering the lens barrel 10G.

  The rear lens body 40 and the sliding knob 22G are preferably connected only when necessary so as not to hinder the focusing of the rear lens element 32 by driving the motor 60. For example, when the sliding knob 22G is pressed once, it is pressed deeply into the cylindrical portion 20G, but when pressed again, the deeply pressed state into the cylindrical portion 20G can be released.

  In this case, when the sliding knob 22G is pressed and deeply pushed into the cylindrical body portion 20G, the rear side (X2 side) of the other end side of the sliding knob 22G is the rear lens of the rear lens body 40. The other end side of the sliding knob 22G and the rear lens can be engaged with the front side (X1 side) surface of the frame 42, or the sliding knob 22G is fitted into any part of the rear lens frame 42. The connected state of the body 40 may be realized.

  In addition, a magnet is arranged on the other end side of the sliding knob 22G, and a magnet is also arranged on the rear lens frame 42, and the other end side of the sliding knob 22G and the rear lens body 40 are separated by magnetic attraction therebetween. It is good also as what is connected. In this case, the rear lens body 40 can be configured to be separated from the magnet on the other end side of the sliding knob 22G by receiving a force exceeding the magnetic attraction force from the motor 60.

  Moreover, it is good also as a structure which equips the back lens frame 42 of the back lens body 40, or the internal level | step difference surface 51 with a taper surface. An example of such a configuration is shown in FIG. FIG. 10 is a schematic enlarged view showing a configuration of a dustproof mechanism 80H according to a modification of the first configuration example. In the dustproof mechanism 80H shown in FIG. 10, the internal step surface 51H is provided in a tapered shape. Further, the rear lens frame 42H has a frame taper surface 42H4. Therefore, when the rear lens body 40H moves to the rear side (X2 side), the frame taper surface 42H4 is applied to the inner step surface 51H while receiving a force in the direction in which the diameter of the rear lens frame 42H contracts from the tapered inner step surface 51H. Abut. For this reason, the adhesiveness of the frame taper surface 42H4 and the taper-shaped internal level | step difference surface 51H can be improved.

  In the configuration shown in FIG. 10, a configuration may be adopted in which the tapered inner stepped surface 51H is provided while the rear lens frame 42H is not provided with the frame tapered surface 42H4. For example, the rear lens frame 42H may have the same shape as the rear lens frame 42A shown in FIG. That is, a configuration in which a tapered surface is provided only in any part of the internal step surface 51H may be employed.

  Moreover, the part which contacts the taper-shaped internal level | step difference surface 51H among the cross sections of the back lens frame 42H may be formed in the curved surface shape containing a circular arc. Even in this case, the 42D1 frame tapered surface 42H4 abuts against the internal step surface 51H while receiving a force in the direction in which the diameter of the rear lens frame 42H is contracted from the tapered internal step surface 51H. For this reason, the adhesiveness of the frame taper surface 42H4 and the taper-shaped internal level | step difference surface 51H can be improved.

  Further, the rear lens frame 42 and the inner step surface 51 of the rear lens body 40 may have a tapered surface, for example, as shown in FIG. FIG. 11 is a schematic enlarged view showing a configuration of a dustproof mechanism 80I according to a modification of the sixth configuration example. In FIG. 11, an internal tapered surface 51I1 is provided at a corner on the inner diameter side of the internal step surface 51I. A frame taper surface 42I4 is provided between the frame rear surface 42I1 and the inward protruding portion 42I3. When the rear lens body 40I moves to the rear side (X2 side), the frame rear surface 42I1 comes into contact with the internal tapered surface 51I1. At this time, the frame rear surface 42I1 and the internal step surface 51 may contact or may not contact each other.

  11 can improve the adhesion between the frame tapered surface 42I4 and the internal tapered surface 51I1 as in the configuration shown in FIG. 10 described above. Here, in the configuration shown in FIG. 11, a configuration may be adopted in which the inner tapered surface 51I1 is provided but the rear lens frame 42I is not provided with the frame tapered surface 42I4. For example, the rear lens frame 42I may have the same shape as the rear lens frame 42F shown in FIG. That is, a configuration in which a tapered surface is provided only at the inner peripheral end of the internal step surface 51I may be employed.

  In addition to the first configuration example and the sixth configuration example, the lens barrels 10B to 10E according to the other second to fifth configuration examples also have a tapered surface at least in any part of the internal step surfaces 51B to 51E. Of course, it is possible to adopt a structure in which

  In the above-described embodiment, a lens barrel that can be attached to a camera body such as a single-lens reflex camera (including a mirrorless single-lens camera) has been described. However, any configuration can be used as long as the lens barrel can be attached to a body other than the camera body. For example, the lens barrel of the present invention can be used in various devices such as a microscope, a telescope, a video camera, a projector, and a medical device.

DESCRIPTION OF SYMBOLS 10,10A-10I ... Lens barrel, 11 ... Interchangeable lens camera, 20A-20I ... Cylindrical body part, 21G ... Slit, 22G ... Sliding knob, 30 ... Imaging optical system, 31 ... Front lens element, 32, 32A 32F, 32H, 32I ... rear lens element, 40, 40A-40F, 40H, 40I ... rear lens body, 41 ... front lens frame, 42, 42A-42F, 42H, 42I ... rear lens frame, 42A1-42F1, 42H, 42I ... frame rear surface, 42D1 ... projecting portion, 42D2 ... projecting end surface, 42F3 ... inward projecting portion, 42H4, 42I4 ... frame tapered surface, 50 ... lens barrel side mount portion, 51, 51A to 51F, 51H, 51I ... Inner step surface, 51I1 ... inner taper surface, 52 ... outer step portion, 53 ... small diameter tube portion, 54, 54A to 54F, 54H, 54I ... lens barrel side opening portion, 55 ... Joint part, 56C ... sealing convex part, 56C1 ... convex end surface, 57D ... sealing concave part, 60 ... motor (drive mechanism), 61 ... drive transmission member, 70 ... lens control part (corresponding to control means), 80, 80A 80F, 80H, 80I ... dustproof mechanism, 90E ... sealing member, 100 ... camera body (main body), 110 ... image sensor, 120 ... body side mount, 130 ... body side opening, 140 ... body controller, 321 ... Use region, 322 ... Non-use region, L ... Optical axis, M ... Focus movement range

Claims (13)

A lens barrel that includes a photographing optical system composed of a plurality of lens elements and is detachably attached to the main body,
A cylindrical portion in which the photographing optical system is provided;
A lens barrel that is provided integrally with the cylindrical body portion, has a small-diameter cylindrical portion that is smaller in diameter than the cylindrical body portion, and has an opening on the main body side on the end side of the small-diameter cylindrical portion. Side mount,
Among the plurality of lens elements, a rear lens element that is closest to the body side and a rear lens frame that holds the rear lens element are provided inside the cylindrical body portion, and when not in use, the cylinder A rear lens body that closes the inner side of the lens barrel side mount part so that the inside of the body part does not communicate with the outside;
A drive mechanism for moving the rear lens body along the optical axis direction;
With
The inner diameter of the small diameter cylindrical portion is provided smaller than the outer diameter of the rear lens body,
An inner step surface on which the rear lens body abuts directly or indirectly is provided around the small-diameter tube portion of the lens barrel side mount portion.
A lens barrel characterized by that. The lens barrel according to claim 1,
When not in use, the frame rear surface on the main body side of the rear lens frame is in contact with the internal step surface, thereby closing the inner side of the lens barrel side mount part.
A lens barrel characterized by that. The lens barrel according to claim 1,
When not in use, the rear lens element is in contact with the inner stepped surface to close the inner side of the lens barrel side mount part,
A lens barrel characterized by that. The lens barrel according to claim 1,
The internal step surface is provided with a sealing projection that protrudes in a direction away from the main body side,
When not in use, the frame rear surface on the main body side of the rear lens frame is in contact with the convex end surface which is the end surface on the protruding side of the sealing convex portion, thereby closing the inner side of the lens barrel side mount portion.
A lens barrel characterized by that. The lens barrel according to claim 1,
The inner stepped surface is provided with a sealing recess recessed toward the main body side,
The rear lens frame is provided with a protruding portion that protrudes toward the main body side,
When the projection is not in use, the protrusion enters the sealing recess, thereby closing the inner side of the lens barrel side mount.
A lens barrel characterized by that. The lens barrel according to claim 1,
The internal step surface is provided with a fitting recess that is recessed toward the main body side,
A sealing member formed from an elastic member is fitted into the fitting recess,
When not in use, the frame rear surface on the main body side of the rear lens frame is in contact with the sealing member, thereby closing the inner side of the lens barrel side mount part.
A lens barrel characterized by that. The lens barrel according to claim 2,
On the inner diameter side of the rear lens frame, an inward protruding portion that protrudes toward the main body side than the rear surface of the frame is provided,
When not in use, the frame rear surface on the main body side of the rear lens frame comes into contact with the internal step surface, and further, the inward protruding portion enters the small diameter cylindrical portion, so that the inner side of the lens barrel side mounting portion is Occluded,
A lens barrel characterized by that. A lens barrel that includes a photographing optical system composed of a plurality of lens elements and is detachably attached to the main body,
A cylindrical portion in which the photographing optical system is provided;
A lens barrel that is provided integrally with the cylindrical body portion, has a small-diameter cylindrical portion that is smaller in diameter than the cylindrical body portion, and has an opening on the main body side on the end side of the small-diameter cylindrical portion. Side mount,
A rear lens element that is closest to the main body side among the plurality of lens elements and a rear lens frame that holds the rear lens element; and a rear lens body provided inside the cylindrical body part;
A drive mechanism for moving the rear lens body along the optical axis direction;
Control means for controlling the drive of the drive mechanism;
With
The inner diameter of the small diameter cylindrical portion is provided smaller than the outer diameter of the rear lens body,
An inner step surface on which the rear lens body abuts directly or indirectly is provided around the small-diameter tube portion of the lens barrel side mount portion,
When it is determined that the closing timing has arrived, the control means drives the driving mechanism so that the rear lens body directly or indirectly contacts the internal step surface, thereby the cylindrical body portion. The inside of the lens barrel side mount is closed so that the inside of the lens does not communicate with the outside.
A lens barrel characterized by that. The lens barrel according to claim 8, wherein
The control means includes
Driving the drive mechanism in a focus movement range that is a range in which the rear lens body is moved for focusing;
When it is determined that the closing timing has arrived, the rear lens body is moved directly or indirectly to the inner side by moving the rear lens body to the main body side with respect to the focus movement range by driving the driving mechanism. Abutting the stepped surface, closing the inner side of the lens barrel side mounting portion so that the inside of the cylindrical body portion does not communicate with the outside,
A lens barrel characterized by that. The lens barrel according to claim 8 or 9, wherein
The control means determines that the closing timing has arrived at the power-off timing of the main body;
A lens barrel characterized by that. The lens barrel according to any one of claims 8 to 10,
The control means determines that the closing timing has arrived at a timing at which the electrical connection between the main body and the lens barrel is detected.
A lens barrel characterized by that. The lens barrel according to any one of claims 8 to 11,
The control means determines that the closing timing has arrived when the release button for removing the lens barrel from the main body is pressed,
A lens barrel characterized by that. The lens barrel according to any one of claims 1 to 12,
A camera body having a body-side mount portion to which the lens barrel is detachably attached;
An interchangeable lens camera comprising:

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