JP2008224949A - Lens barrel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate backlash in an optical axis direction and to prevent leakage of light in a lens barrel in which a plurality of barrel members are incorporated. <P>SOLUTION: In the lens barrel including an inside barrel member 30 and an outside barrel member 20 fit in a nested state so as to relatively move in the optical axis direction L, the outside barrel member 20 has a backward-turned face part 25 turned backward in the optical axis direction, and the inside barrel member 30 has a forward-turned face part 32 turned forward in the optical axis direction, and a sheet type elastic member 100 compressed in the optical axis direction so as to generate energizing force is provided between the backward-turned face part 25 and the forward-turned face part 32. Thus, backlash removal (backlash elimination) of the outside barrel member and the inside barrel member in the optical axis direction is performed, and external light is prevented from entering. Since the elastic member is the sheet type one which can be compressed and deformed, structure is simplified, the cost thereof is reduced and installation space is reduced, and the lens barrel is miniaturized. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lens barrel mounted on a digital camera, a silver salt film camera, or the like, and in particular, a lens barrel that relatively moves a plurality of cylindrical members that are nested on the same axis in the optical axis direction. About.

A conventional lens barrel includes a first lens group, a second lens group, a third lens group, and a cam mechanism and cam that move the lens group in the optical axis direction, which are arranged to move relatively in the optical axis direction. There is a known one provided with a biasing spring or the like that is arranged in a compressed state between the second lens group and the third lens group so as to absorb the play of the mechanism and that exerts an urging force in the optical axis direction (for example, a patent) Reference 1).
However, in this lens barrel, the backlash in the optical axis direction is only absorbed by the biasing force of the biasing spring, and the optical axes of the lens groups are matched so as not to tilt by the biasing force of the biasing spring. It is necessary to arrange a plurality of one-sided springs at equal intervals in the circumferential direction so that the urging force acts uniformly, and since the one-sided springs are coil springs, an installation space must be secured. This leads to an increase in the size of the lens barrel. Further, with the one-sided spring, it is not possible to prevent the entry of external light from between the cylindrical members arranged in a nested manner on the same axis, that is, light leakage.

Further, the other lens barrel includes a cylindrical cam barrel, three concave portions formed at equal intervals in the circumferential direction on the end surface of the cam barrel, and plate springs respectively disposed in the concave portions. It is known that the cam cylinder is loosened in the direction of the optical axis by generating an urging force by elastically deforming the leaf spring so as to bend while suppressing an increase in the total length of (for example, Patent Document 2).
However, in this lens barrel, since the elastic member is a leaf spring, it is necessary to set a relatively large arrangement space (for example, a recess) in consideration of the amount of bending, and the cam barrel and its It is not possible to prevent the entry of external light from the space between the cylindrical members arranged coaxially around the periphery, that is, light leakage.

Furthermore, other lens barrels include a lens frame, a rectilinear cylinder arranged outside the lens frame to support the lens frame so as to be movable in the optical axis direction, and a cam groove into which the follower pin of the lens frame is inserted. Friction when the lens frame moves, including a cam cylinder coaxially arranged outside the cylinder, a synthetic fiber (elastic member) arranged to increase sliding resistance between the lens frame and the straight cylinder It is known that the follower pin is shifted to one side of the cam groove (side opposite to the moving direction) by force to prevent the follower pin and the cam groove from rattling (for example, see Patent Document 3).
However, in this lens barrel, when the moving direction of the lens frame is switched, the follower pin comes into contact with the opposite side surface of the cam groove, and the follower pin can be easily moved from one side surface of the cam groove by an impact or the like. There is a possibility of moving so as to come into contact with the other side surface, and play in the optical axis direction cannot be completely prevented.

JP 2004-287142 A JP 2000-180689 A JP-A-11-52212

  The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to simplify the structure and reduce the diameter of a lens barrel in which a plurality of cylindrical members are nested. In particular, it is possible to perform backlash in the optical axis direction of the lens tube with respect to the imaging plane while reducing the size, reducing the thickness in the optical axis direction, and preventing the entry of external light (light leakage). It is to provide a lens barrel that can be used.

The lens barrel of the present invention is a lens barrel including an inner cylinder member and an outer cylinder member that are fitted in a nested manner so as to be relatively movable in the optical axis direction, and the outer cylinder member is rearward in the optical axis direction. The inner cylindrical member has a front-facing surface portion facing forward in the optical axis direction, and between the rear-facing surface portion and the front-facing surface portion is compressed in the optical axis direction to generate a biasing force. The elastic member is provided.
According to this configuration, since the thin plate-like elastic member is interposed in the optical axis direction between the rear surface portion of the outer cylindrical member and the front surface portion of the inner cylindrical member, the outer cylindrical member in the optical axis direction and The inner cylinder member can be loosened (raised). Further, since the elastic member is a thin plate that can be compressed and deformed, the structure can be simplified, the cost can be reduced, the installation space can be narrowed, and the lens barrel can be downsized.

In the above configuration, the forward-facing surface portion may adopt a configuration in which the elastic member is compressed and deformed by moving the inner cylindrical member forward in the optical axis direction from a state that is not in contact with the elastic member. it can.
According to this configuration, since the inner cylindrical member moves forward and the forward facing surface portion compresses and deforms the elastic member, an urging force (backlash force) in the optical axis direction can be obtained for the first time. In the operation area, the load can be reduced and the operation can be performed smoothly, and in the area where the backlash is required (for example, a photographing area such as a digital camera), the backlash can be reliably performed.

The said structure WHEREIN: The elastic member can employ | adopt the structure currently formed cyclically | annularly.
According to this configuration, since the elastic member is formed in an annular shape, it is possible to generate an urging force with a good balance in the circumferential direction, and uniform backlashing can be performed.

The said structure WHEREIN: The structure currently formed so that an elastic member may bulge toward the outer peripheral surface of an inner cylinder member can be employ | adopted by compressing in an optical axis direction.
According to this configuration, since the elastic member is formed in an annular shape and bulges inward in the radial direction by compressive deformation, the annular gap between the outer cylindrical member and the inner cylindrical member is closed over the entire circumference. And entry of external light (light leakage) can be prevented.

In the above-described configuration, the elastic member is swelled toward the outer peripheral surface of the second inner cylinder member by being compressed in the optical axis direction, including the second inner cylinder member that is nested inside the inner cylinder member. It is possible to adopt a configuration that is formed as described above.
According to this configuration, since the elastic member is formed in an annular shape and bulges inward in the radial direction by compressive deformation, an annular gap between the outer cylindrical member (inner cylindrical member) and the second inner cylindrical member is formed. The entire circumference can be blocked, and the entry of external light (light leakage) can be prevented.

In the above configuration, the elastic member may be formed of a synthetic fiber.
According to this configuration, the elastic member can be easily formed into a thin plate shape, and can be easily molded into a desired shape (for example, an annular shape).

In the above configuration, the elastic member may be formed of a nonwoven fabric.
According to this configuration, the elastic member can be easily molded into a desired shape (for example, a thin plate shape, an annular shape, etc.), and various types of fibers can be used as the fabric. Since it can be applied and has high productivity, the cost can be reduced.

  According to the lens barrel of the present invention having the above-described configuration, the backlash in the optical axis direction of the lens cylinder with respect to the image plane is particularly achieved while achieving simplification of the structure, small diameter, miniaturization, thinning in the optical axis direction and the like. It is possible to provide a lens barrel capable of taking out light and preventing external light from entering (light leakage).

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.
FIGS. 1 to 11 show an embodiment of a lens barrel according to the present invention. FIGS. 1 to 3 are sectional views of the lens barrel, and FIG. 4 is a fixed cylinder forming a part of the lens barrel. FIG. 5 is a development view of a rotating cylinder forming a part of the lens barrel, FIG. 6 is a development view of a cam key cylinder forming a part of the lens barrel, and FIG. 7 is a cam forming a part of the lens barrel. FIG. 8 is a development view of a key cylinder forming a part of a lens barrel, FIGS. 9 and 10 are partial development views and operation explanatory views showing the relationship between a fixed cylinder and a rotary cylinder, and FIG. 11 is a rotary cylinder. It is a partial expanded view which shows the relationship between a cam key cylinder.

  As shown in FIGS. 1 to 3, the lens barrel rotates and rotates inside the base 10, the base 10 to which the imaging element PE such as the filter plate FP and CCD is attached, the fixed cylinder 20 fixed to the base 10, and the fixed cylinder 20. Rotating cylinder 30 fitted in a nesting manner so as to be movable in the optical axis direction L, and a cam key nestingly fitted so as to be non-rotatable inside the rotating cylinder 30 and movable together with the rotating cylinder 30 in the optical axis direction L The cylinder 40, a cam cylinder 50 fitted in a nested manner so as to be rotatable and movable in the optical axis direction L inside the cam key cylinder 40, cannot be rotated inside the cam cylinder 50, and together with the cam cylinder 50 in the optical axis direction L And a first lens barrel 70 fitted into the key barrel 60, the key barrel 60, and the cam barrel 50 so as to be movable and telescopically movable in the optical axis direction L. Two lens cylinders 80, a lens holding cylinder 90 supported so as to be movable in the optical axis direction L inside the first lens cylinder 70, and the first lens cylinder 70 provided to drive the lens holding cylinder 90 in the optical axis direction L. A driving mechanism (not shown), a driving mechanism (not shown) provided on the base 10 for rotationally driving the rotating cylinder 30, an elastic member 100 interposed between the fixed cylinder 20 and the rotating cylinder 30, the rotating cylinder 30, An elastic member 110 that is interposed between the cam key cylinder 40 and faces the outer peripheral surface of the cam cylinder 50, an elastic member 120 that is interposed between the cam cylinder 50 and the key cylinder 60 and faces the outer peripheral surface of the first lens cylinder 70, and the like. ing.

  The base 10 is molded using a resin material, and as shown in FIGS. 1 to 3, an opening 11 through which light passes, and a recess formed behind the opening 11 to which the filter plate FP and the image sensor PE are attached. 12 etc. are formed. Further, the base 10 is provided with a drive mechanism (not shown) including a gear train for rotationally driving the rotary cylinder 30 in a region outside the fixed cylinder 20.

As shown in FIGS. 1 and 4, the fixed cylinder 20 is formed in a cylindrical shape having an axial center on the optical axis L using a resin material, and is fixed to the base 10, and a rotating cylinder 30 (which will be described later). Three cam grooves 21 formed on the inner peripheral surface to exert a cam action on the follower pin 31), three guide grooves 22 for guiding the cam key cylinder 40 (projection 41 described later) only in the optical axis direction L, in the circumferential direction An arc-shaped protrusion 23 protruding in a long length, a front end annular portion 24 having a diameter smaller than the inner peripheral surface, an annular rear surface portion 25 formed so as to face rearward in the optical axis direction L in the front end annular portion 24, and the like. It is formed as follows.
The fixed cylinder 20 functions as an outer cylinder member with respect to the rotary cylinder 30, and an elastic member 100 to be described later is fitted so as to contact the facing surface portion 25 thereafter.

  As shown in FIGS. 1 and 5, the rotating cylinder 30 is formed in a cylindrical shape having an axis on the optical axis L using a resin material, and is fitted inside the fixed cylinder 20. Three follower pins 31 provided at equal intervals to be inserted into the cam groove 21 of the fixed cylinder 20 on the side R, and three formed so as to protrude in the circumferential direction and to face the front in the optical axis direction L The front surface 32, a tooth row (not shown) formed on the rear end side to mesh with the drive mechanism (gear) on the base 10, and a follower pin 51 (of the cam barrel 50) to be described later are slid on the inner peripheral surface thereof. Three guide grooves 33 that are guided in the optical axis direction L so as to be movable, three linear grooves 34 that are passed through when fitting hooks 44 (of the cam key cylinder 40) to be described later, and hooking protrusions 44 are inserted on the front side F And slidable in the circumferential direction perpendicular to the optical axis L. An annular groove 35, a front end annular portion 36 having a diameter smaller than that of the inner peripheral surface, an annular rear surface portion 37 formed so as to face rearward in the optical axis direction L in the front end annular portion 36, and the like. Yes.

The rotating cylinder 30 functions as an inner cylinder member with respect to the fixed cylinder 20, functions as an outer cylinder member with respect to the cam key cylinder 40, and an elastic member 110 described later is fitted so as to contact the facing surface portion 37 thereafter. It has become.
The forward-facing surface portion 32 is formed to compress the elastic member 100 when the rotary cylinder 30 moves to a predetermined position in front of the optical axis direction L with respect to the fixed cylinder 20.

As shown in FIGS. 1 and 6, the cam key cylinder 40 is formed in a cylindrical shape having a shaft center on the optical axis L using a resin material, and is fitted inside the rotary cylinder 30. The three projections 41 inserted into the 20 guide grooves 22 and the three follower pins 51 of the cam cylinder 50 to be described later receive three cam holes 42 that exert a cam action in the optical axis direction L, and the inner peripheral surface thereof will be described later. In the three guide grooves 43 that receive the protrusion 62 of the key cylinder 60 and guide it in the optical axis direction L, the three engaging protrusions 44 inserted into the annular groove 35 of the rotating cylinder 30 on the outer peripheral surface of the front end, It is formed so as to include a forward-facing surface portion 45 and the like formed so as to face the front in the optical axis direction L.
The cam key cylinder 40 functions as an inner cylinder member with respect to the rotary cylinder 30, and its forward facing portion 45 compresses the elastic member 110 to a predetermined compression allowance in a state where the cam key cylinder 40 is incorporated in the rotary cylinder 30. Is formed.

In the cam key cylinder 40, the latching protrusion 44 is inserted into the annular groove 35 of the rotating cylinder 30, and the protrusion 41 is inserted into the guide groove 22 of the fixed cylinder 20, so that the rotation of the rotating cylinder 30 is allowed. In this way, it is held by the fixed cylinder 20 and moves in the optical axis direction L together with the rotating cylinder 30.
Further, a follower pin 51 of the cam cylinder 50 described later is inserted into the through-cam hole 42 of the cam key cylinder 40 so as to exert a cam action on the cam cylinder 50 in the optical axis direction L.

  As shown in FIGS. 1 and 7, the cam cylinder 50 is formed in a cylindrical shape having a shaft center on the optical axis L by using a resin material, and is fitted inside the rotary cylinder 30 and the cam key cylinder 40. Three follower pins 51 projecting radially outward from the surface and formed at equal intervals in the circumferential direction, and three cam grooves 52 formed on the inner peripheral surface and exerting a cam action on the follower pin 71 of the first lens barrel 70, Three cam grooves 53 which are formed on the inner peripheral surface and have a cam action on the follower pin 81 of the second lens cylinder 80, an annular groove 54 formed in the vicinity of the front end, and a front end annular portion 55 which is smaller in diameter than the inner peripheral surface. The front end annular portion 55 is formed with an annular rear surface portion 56 formed so as to face the rear in the optical axis direction L.

The cam cylinder 50 functions as a second inner cylinder member with respect to the cam key cylinder 40, and an elastic member 120 described later is fitted into the front region of the annular groove 54 so as to contact the facing surface portion 56.
As the cam cylinder 50 rotates, the cam groove 52 exerts a cam action in the optical axis direction L on the first lens cylinder 70 (the follower pin 71), and the cam groove 53 acts on the second lens cylinder 80 (the follower pin thereof). 81) with respect to the optical axis direction L.

As shown in FIGS. 1 and 8, the key cylinder 60 is formed in a cylindrical shape having a shaft center on the optical axis L using a resin material, and is fitted inside the cam cylinder 50. The three projections 61 inserted into the guide grooves 43 of the 40, the three follower pins 71 of the first lens cylinder 70 described later, and the three guide grooves 62 for guiding in the optical axis direction L, and the second lens cylinder 80 described later. Three guide grooves 63 for receiving three follower pins 81 and guiding them in the optical axis direction L, three latching protrusions 64 inserted into the annular groove 54 of the cam barrel 50, and the front end including the latching protrusions 64 in the optical axis direction It is formed to include a forward-facing surface portion 65 and the like formed so as to face the front of L.
The key cylinder 60 functions as an inner cylinder member with respect to the cam cylinder 50, and the forward facing surface portion 65 is formed so as to compress the elastic member 120 to a predetermined compression allowance in a state of being incorporated in the cam cylinder 50. Yes.

As shown in FIG. 1, the first lens cylinder 70 is formed in a cylindrical shape having an axis on the optical axis L using a resin material, and is fitted inside the cam cylinder 50 and the key cylinder 60. Projecting outward in the radial direction and three follow pins 71 formed at equal intervals in the circumferential direction, a cylindrical portion 72 for supporting the lens holding cylinder 90 holding the lens G1 movably in the optical axis direction L, a predetermined aperture And a driving mechanism (not shown) for driving the lens holding cylinder 90 in the optical axis direction L is held therein.
The first lens cylinder 70 functions as a second inner cylinder member with respect to the key cylinder 60, and is subjected to a cam action by the cam cylinder 50 (the cam groove 52) while being restricted by the key cylinder 60. It moves in the optical axis direction L. Further, the lens holding cylinder 90 is driven by a drive mechanism and moves in the optical axis direction L relative to the first lens cylinder 70.

As shown in FIG. 1, the second lens cylinder 80 is formed in a cylindrical shape having an axis on the optical axis L using a resin material so as to hold the lens G <b> 2. Three follower pins 81 that are fitted inside, protrude radially outward from the outer peripheral surface and are formed at equal intervals in the circumferential direction, a shutter mechanism S that opens and closes the light path behind the lens G2, and the like are provided. Is formed.
The second lens barrel 80 is moved in the optical axis direction L by being cammed by the cam barrel 50 (the cam groove 53 thereof) while the rotation is regulated by the key barrel 60.

1, 4, 9, and 10, the elastic member 100 is formed in an annular thin plate shape using synthetic fibers, and the rear surface portion 25 and the rotating cylinder 30 of the fixed cylinder 20 (outer cylinder member). It arrange | positions between the front surface parts 32 of (inner side cylinder member). Further, the elastic member 100 may be formed of a woven fabric. In this case, various fibers can be applied to form the woven fabric, and can be molded into a desired shape, resulting in high productivity and reduced cost.
The elastic member 100 is not in contact with the forward facing surface portion 32 as shown in FIGS. 1 and 10A when the rotary cylinder 30 is retracted rearward in the optical axis direction L with respect to the fixed cylinder 20. When there is a state and the rotary cylinder 30 moves (feeds) a predetermined amount forward in the optical axis direction L, as shown in FIGS. 9 and 10 (b), the front surface portion 32 comes into contact and is compressed to a predetermined compression allowance. And bulges inward in the radial direction so as to be close to or close to the outer peripheral surface of the rotary cylinder 30.

As described above, the thin plate-like elastic member 100 is compressed in the optical axis direction L and interposed between the rearward surface portion 25 of the fixed cylinder 20 and the forward surface portion 32 of the rotary cylinder 30, whereby both cylinders in the optical axis direction L are provided. The members can be loosened (raised). In addition, since the elastic member 100 is a thin plate that can be compressed and deformed, the structure can be simplified, the cost can be reduced, the installation space can be narrowed, and the lens barrel can be downsized.
Further, the forward facing surface portion 32 is formed so as to compress and deform the elastic member 100 by moving the rotating cylinder 30 forward in the optical axis direction L from a state in which the elastic member 100 is not in contact with the elastic member 100. In an unnecessary operation area, the load can be reduced and the operation can be performed smoothly. In an area where a backlash is required (for example, a shooting area such as a digital camera), the backlash can be reliably performed.

As shown in FIGS. 1, 5, and 11, the elastic member 110 is formed in a thin plate shape made of a synthetic fiber, and has a rear surface 37 and a cam key cylinder 40 (inner cylinder). Between the forward facing surface portions 45 of the member). Further, the elastic member 110 may be formed of a woven fabric. In this case, various fibers can be applied to form the woven fabric, and can be molded into a desired shape, resulting in high productivity and reduced cost.
The elastic member 110 is inserted into the rotary cylinder 30 with the cam key cylinder 40 assembled therein, and is sandwiched between the rearward surface portion 37 and the frontward surface portion 45 and is compressed to a predetermined compression margin, and bulges inward in the radial direction. The cylinder 50 (second inner cylinder member) is in close contact with or close to the outer peripheral surface.

  As described above, the thin plate-like elastic member 110 is compressed in the optical axis direction L and interposed between the rear surface portion 37 of the rotary cylinder 30 and the front surface portion 45 of the cam key cylinder 40, so that both cylinders in the optical axis direction L are provided. The members can be loosened (raised). Further, since the elastic member 110 is a thin plate that can be compressed and deformed, the structure can be simplified, the cost can be reduced, the installation space can be narrowed, and the lens barrel can be downsized.

As shown in FIGS. 1 and 7, the elastic member 120 is formed in a thin plate shape made of a synthetic fiber and has a rear surface portion 56 of the cam cylinder 50 (outer cylinder member) and a key cylinder 60 (inner cylinder member). Arranged between the forward facing portions 65. Further, the elastic member 120 may be formed of a woven fabric. In this case, various fibers can be applied to form the woven fabric, and can be molded into a desired shape, resulting in high productivity and reduced cost.
Then, the elastic member 120 is sandwiched between the rearward face portion 56 and the forward face portion 65 in a state where the key cylinder 60 is incorporated in the cam cylinder 50, and is compressed to a predetermined compression margin and bulges inward in the radial direction. The lens barrel 70 (second inner cylinder member) is in close contact with or close to the outer peripheral surface.

  In this manner, the thin plate-like elastic member 120 is compressed in the optical axis direction L and interposed between the rearward surface portion 56 of the cam tube 50 and the forward surface portion 65 of the key tube 60, whereby both tubes in the optical axis direction L are disposed. The members can be loosened (raised). In addition, since the elastic member 120 is a thin plate that can be compressed and deformed, the structure can be simplified, the cost can be reduced, the installation space can be narrowed, and the lens barrel can be downsized.

The operation of the lens barrel will be described with reference to FIGS.
First, when in the retracted position shown in FIG. 1, the forward facing surface portion 32 of the rotating cylinder 30 is not in contact with the elastic member 100.
When the rotating cylinder 30 is rotated by the drive mechanism, the rotating cylinder 30 moves forward in the optical axis direction L due to the cam action of the fixed cylinder 20, and the cam key cylinder 40 is also controlled with the rotating cylinder 30 while the rotation is restricted. The cam barrel 50 is moved forward in the optical axis direction L while being rotated by the cam action of the cam key barrel 40, and the first lens barrel 70 and the second lens barrel 80 are moved to the cam barrel 50. 2 moves relative to the optical axis direction L by the cam action and moves to the wide-angle end shown in FIG.

At the wide angle end, the elastic member 100 is compressed to a predetermined compression allowance by the forward facing surface portion 32. After that, even if it is further driven and moved to the telephoto end shown in FIG.
As described above, since the elastic member 100 is not compressed in the operation region where the backlash from the retracted position to the wide-angle end is unnecessary, the load during operation can be reduced, and the elastic member 100 can be smoothly operated. In the imaging area, the backlash is surely performed and at the same time the entry of external light is prevented.
In addition, the elastic member 110 and the elastic member 120 always perform backlash in the optical axis direction L between the cylindrical members and prevent the entry of external light.

In the above embodiment, the case where the elastic members 100, 110, 120 are formed of synthetic fibers or non-woven fabrics has been shown. However, the present invention is not limited to this. As long as an elastic force (biasing force) can be obtained, a rubber material or other elastic material may be used.
In the above-described embodiment, the case where the present invention is adopted in the configuration including the two lens cylinders 70 and 80 is shown. However, the present invention is not limited to this, and the configuration including the three or more lens cylinders is not limited thereto. The invention may be applied.

  As described above, the lens barrel of the present invention achieves a structure that is simplified, reduced in diameter, downsized, thinned in the optical axis direction, etc. In addition, it can be applied as a lens barrel of a digital camera equipped with an image sensor, because it can prevent the entry of external light (light leakage). It is also useful for cameras and other photographing devices.

It is sectional drawing which shows one Embodiment of the lens barrel which concerns on this invention. It is sectional drawing which shows one Embodiment of the lens barrel which concerns on this invention. It is sectional drawing which shows one Embodiment of the lens barrel which concerns on this invention. It is an expanded view which shows the internal peripheral surface of the fixed cylinder which makes a part of lens barrel. It is an expanded view which shows the internal peripheral surface of the rotation cylinder which makes a part of lens barrel. It is an expanded view which shows the internal peripheral surface of the cam key cylinder which makes a part of lens barrel. It is an expanded view which shows the internal peripheral surface of the cam cylinder which makes a part of lens barrel. It is an expanded view which shows the internal peripheral surface of the key cylinder which makes a part of lens barrel. It is a partial expanded view which shows the relationship between a fixed cylinder and a rotation cylinder. (A), (b) is an operation | movement figure which shows the relationship between a fixed cylinder and a rotation cylinder. FIG. 5 is a partial development view showing a relationship between a rotary cylinder and a cam key cylinder.

Explanation of symbols

L Optical axis direction G1, G2 Lens 10 Base 11 Opening 12 Recess 20 Fixed cylinder 21 Cam groove 22 Guide groove 25 Backward face part 30 Rotating cylinder 31 Follower pin 32 Forward face part 35 Annular groove 37 Backward face part 40 Cam key cylinder 41 Projection 42 Cam groove 45 Front face 50 Cam cylinder 51 Follower pins 52, 53 Cam groove 54 Annular groove 56 Backward face 60 Key cylinder 61 Projection 65 Forward face 70 First lens cylinder 71 Follower pin 80 Second lens cylinder 81 Follower pin 90 Lens holding cylinder 100, 110, 120 Elasticity Element

Claims (7)

A lens barrel including an inner cylinder member and an outer cylinder member that are fitted in a nested manner so as to be relatively movable in the optical axis direction,
The outer cylindrical member has a rearward surface portion facing rearward in the optical axis direction,
The inner cylindrical member has a forward-facing surface portion facing forward in the optical axis direction,
Between the rear surface portion and the front surface portion, a thin plate-like elastic member that is compressed in the optical axis direction to generate an urging force is provided.
A lens barrel characterized by that. The forward-facing surface portion is formed so as to compress and deform the elastic member by moving the inner cylindrical member forward in the optical axis direction from a state of non-contact with the elastic member.
The lens barrel according to claim 1. The elastic member is formed in an annular shape,
The lens barrel according to claim 1, wherein the lens barrel is provided. The elastic member is formed to bulge toward the outer peripheral surface of the inner cylindrical member by being compressed in the optical axis direction.
The lens barrel according to claim 3. Including a second inner cylinder member that is nested inside the inner cylinder member,
The elastic member is formed so as to bulge toward the outer peripheral surface of the second inner cylindrical member by being compressed in the optical axis direction.
The lens barrel according to claim 3. The elastic member is made of synthetic fiber,
The lens barrel according to claim 1, wherein the lens barrel is provided. The elastic member is formed of a nonwoven fabric,
The lens barrel according to any one of claims 1 to 6, wherein:

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