JP2010026163A - Lens barrel, and optical equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a downsized lens barrel and optical equipment. <P>SOLUTION: The lens barrel (1) is equipped with: a lens (L2) held in a holding frame (82) journaled by a shaft part (83) parallel with an optical axis (A), and moving between a first position and a second position in a plane orthogonal to the optical axis by the rotation of holding frame around the shaft part; a projection (85) provided in the holding frame and formed to project in a direction orthogonal to the optical axis; and a moving member (70) including a holding surface part (70a) holding the lens at the first position in a state where it abuts on the projection, and a recessed part (72) formed at a part of the holding surface part and capable of moving relative to the holding frame. The projection shifts between the state where it abuts on the holding surface part, and the state where it is housed in the recessed part with movement of the moving member, and the lens is held in the second position in the state where the projection is housed in the recessed part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens barrel and an optical apparatus.

Conventionally, as a collapsible lens barrel whose overall length changes between shooting and non-shooting, some lenses are retracted from the optical path in conjunction with the retracting operation to shorten the total length when accommodated. (For example, refer to Patent Document 1).
JP 2003-149723 A

The lens barrel described in the above publication has a configuration in which the lens is retracted using a motor, and the lens barrel may be increased in size.
An object of the present invention is to provide a lens barrel and an optical apparatus that are miniaturized.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.
The invention of claim 1 is held by a holding frame (82) pivotally supported by a shaft portion (83) parallel to the optical axis (A), and the holding frame rotates about the shaft portion to thereby rotate the light. A lens (L2) that moves between a first position and a second position in a plane orthogonal to the axis, and a protrusion (provided to protrude in a direction orthogonal to the optical axis) provided on the holding frame. 85) and a holding surface portion (70a) for holding the lens in the first position in contact with the protrusion, and a recess (72) formed in a part of the holding surface portion, the holding frame A lens barrel having a movable member (70) movable relative to the lens barrel, wherein the protrusion is in contact with the holding surface portion and accommodated in the recess as the moving member moves. The lens is in a state where the projection is received in the recess. Serial is a lens barrel (1), characterized in that it is held in the second position.

According to a second aspect of the present invention, in the lens barrel according to the first aspect, the holding frame (82) is attached in a direction in which the protrusion (85) presses the holding surface portion (70a) of the moving member (70). The lens barrel (1) is provided with a biasing portion (84) for biasing.
According to a third aspect of the present invention, in the lens barrel according to the first or second aspect, the protrusion (85) is configured such that the moving surface (70) moves in the first direction so that the holding surface portion ( 70a) after being slid into the recess (72), and the recess accommodates the protrusion even when the moving member further moves in the first direction in a state where the protrusion is accommodated. It is a lens barrel (1) characterized by including the accommodation maintenance area | region (73) which maintains the state which carried out.
According to a fourth aspect of the present invention, in the lens barrel according to the third aspect, the moving member (70) moves in the first direction in a state where the protrusion (85) is accommodated in the concave portion (72). And a cam groove (71) for moving the holding frame (82) in the optical axis direction, and the holding and maintaining area is a parallel groove portion (73) formed in parallel with the cam groove, When the lens is moved in the optical axis direction, the projection is the lens barrel (1), which moves in the parallel groove portion.
According to a fifth aspect of the present invention, in the lens barrel according to any one of the first to fourth aspects, the holding frame (82) is interlocked with a rotation operation around the shaft portion (83). The moving member (70) moves in the optical axis direction, and the concave portion provided in the moving member includes a linear groove portion (72) provided in parallel with the optical axis (A), The projection (85) is a lens barrel (1) that moves in the linear groove when the holding frame moves in the optical axis direction.
According to a sixth aspect of the present invention, in the lens barrel according to any one of the first to fifth aspects, the holding frame (82) is a bearing portion that is pivotally supported by the shaft portion (83). 82c), a holding portion (82a) for holding the lens (L2), and a connecting portion (82b) for connecting the bearing portion and the holding portion, and the protrusion (85) is formed by the bearing portion (82c). A lens barrel (1).
A seventh aspect of the present invention is the lens barrel according to any one of the first to sixth aspects, wherein the moving member is a cylindrical body (70) that houses the holding frame (82) on the inner diameter side. The holding surface portion (70a) and the concave portion (72) are respectively formed on the inner peripheral surface of the moving member, and the protrusion (85) is held by the rotating member rotating around its center. The lens barrel (1) is characterized in that it shifts between a state in contact with a surface part and a state in which it is accommodated in the concave part.
The invention according to claim 8 is an optical apparatus (100) including the lens barrel (1) according to any one of claims 1 to 7.
Note that the configuration described with reference numerals may be improved as appropriate, or at least a part thereof may be replaced with another component.

  According to the present invention, a miniaturized lens barrel and optical apparatus can be provided.

A camera including an embodiment of a lens barrel to which the present invention is applied will be described below with reference to the drawings and the like.
FIG. 1 is a cross-sectional view of the lens barrel of the embodiment, showing a shooting state.
FIG. 2 shows a retracted state of the lens barrel shown in FIG.
Hereinafter, in each drawing including FIG. 1, a description will be given by setting a three-dimensional coordinate system including an X axis, a Y axis, and a Z axis.
The lens barrel 1 of the embodiment is, for example, a collapsible lens barrel whose total length in the optical axis direction changes between shooting and non-shooting. A part of the lens barrel 1 protrudes from the camera body 100 at the time of shooting, and substantially the entire lens barrel 1 is accommodated in the camera body 100 at the time of non-shooting.

The lens barrel 1 includes a first lens group L1, a second lens group L2, a third lens group L3, a CCD 10, a fixed cylinder 20, a rotating cylinder 30, a rectilinear cam cylinder 40, a rectilinear cylinder 50, and a first lens group holding cylinder 60. The rotary cam cylinder 70, the second group support portion 80, the shutter unit 90, and the like.
The first lens group L1, the second lens group L2, and the third lens group L3 form a zoom lens having a three-group configuration, and a subject in the direction of the optical axis (denoted with reference numeral A in FIG. 1). They are arranged in this order from the side toward the photographer. The incident surface of the second lens unit L2 is a convex lens projecting toward the subject side in the optical axis direction.

  The CCD 10 is a photoelectric conversion element that converts subject light that has passed through the lens groups L1 to L3 into an electrical signal. The CCD 10 is disposed on the emission side of the third lens unit L3. The CCD 10 is fixed to a substantially disk-shaped member called a CCD base 11.

The fixed cylinder 20 is a cylinder whose end on the optical axis direction photographer side is fixed to the CCD table 11.
The rotating cylinder 30 is a cylinder housed on the inner diameter side of the fixed cylinder 20. When the output of an actuator (not shown) is transmitted, the rotating cylinder 30 rotates around the central axis in response to this, and is guided by a helicoid screw (not shown) provided on the fixed cylinder 20 and the rotating cylinder 30 to be guided in the optical axis direction. Move forward and backward.
The rectilinear cam barrel 40 is a barrel that moves integrally with the rotary barrel 30 in the optical axis direction, and is accommodated on the inner diameter side of the rotary barrel 30. The rectilinear cam barrel 40 includes protrusions (not shown) that are inserted into rectilinear grooves formed on the inner peripheral surface of the fixed barrel 20, and is not accompanied by a rotating operation when moving in the optical axis direction. Move straight ahead.

  The rectilinear cylinder 50 is a cylinder accommodated on the inner diameter side of the rectilinear cam cylinder 40. The rectilinear cylinder 50 includes a cam follower 51 that passes through a rectilinear groove formed in the rectilinear cam cylinder 40. The tip of the cam follower 51 is inserted into a cam groove formed in the rotating cylinder 30, and the rectilinear cylinder 50 moves straight in the optical axis direction in conjunction with the rotating operation of the rotating cylinder 30.

The first lens group holding cylinder 60 is a cylinder housed on the inner diameter side of the rectilinear cylinder 50, and a first group holding frame 61 that holds the first lens group L1 is fixed to an end on the subject side in the optical axis direction. Yes.
The first lens group holding cylinder 60 can be linearly moved in the optical axis direction with respect to the linear cylinder 50 by a cam mechanism (not shown). A lens barrier unit 62 that protects the incident surface of the first lens unit L1 during non-photographing is connected to the first lens unit holding cylinder 60 at the end on the subject side in the optical axis direction.

The rotating cam cylinder 70 is a cylinder housed on the inner diameter side of the first lens group holding cylinder 60. A cam groove is formed on the outer peripheral surface of the rotating cam cylinder 70, and a cam follower 63 provided in the first lens group holding cylinder 60 is inserted.
The rotating cam cylinder 70 is used when the lens barrel 1 shifts from the retracted state shown in FIG. 2 to the photographing state shown in FIG. 1 and when the zoom lens moves between the tele position and the wide position in the photographing state. Rotate around the central axis. The telephoto position of the zoom lens refers to the position where the focal length of the zoom lens is the longest (shooting angle of view is minimum), and the wide position is the position where the focal length is the shortest (shooting angle of view is maximum). Shall be referred to.

The second group support portion 80 is a portion that supports the second lens group L2. The second group support portion 80 includes a cam follower 80a inserted into a cam groove 71 formed on the inner peripheral surface of the rotating cam cylinder 70, and moves linearly in the optical axis direction in conjunction with the rotation operation of the rotating cam cylinder 70. To do.
The configuration of the second group support unit 80 will be described in detail later.

  The shutter unit 90 is a known lens shutter device disposed on the incident surface side of the second lens group L 2, and is fixed to the second group support unit 80. The shutter unit 90 includes a shutter blade 91 that is movable between a shielding position that shields the optical path of subject light that passes through the first to third lens groups L1 to L3 and a retreat position that retracts from the optical path.

  Here, when the lens barrel 1 shifts from the photographing state shown in FIG. 1 to the retracted state shown in FIG. 2, the second lens unit L2 moves (slides) in a plane orthogonal to the optical axis A and others. The lens groups L1 and L3 are retracted from the optical path. In the retracted state of the lens barrel 1, the third lens group L3 is accommodated in the space formed by retracting the second lens group L2, as shown in FIG. Thus, the lens barrel 1 can be shortened in the total length in the retracted state.

The second lens group L2 is retracted to the retracted position shown in FIG. 2 when the power of the camera is off, and when the power is turned on, the imaging position (the optical axis of the second lens group L2 and other axes) It moves to a position where the optical axes of the lens groups L1 and L3 substantially coincide.
Hereinafter, the moving mechanism of the second lens unit L2 will be described.

FIG. 3 is a plan view of the rotating cam cylinder and the second group support portion provided in the lens barrel shown in FIG. 1 as seen from the optical axis direction. FIG. 3 shows a retracted state (see FIG. 2) in which the second lens unit L2 is disposed at the retracted position.
The second group support portion 80 includes a main body portion 81 formed in a cylindrical shape and a second group holding frame 82 that is a frame body that holds the second lens group L2.
A cam follower 80 a that is inserted into the cam groove 71 of the rotary cam cylinder 70 described above is provided on the outer peripheral surface of the main body 81. For example, three cam followers 80a are provided at substantially equal intervals. The aforementioned shutter unit 90 is fixed to the main body 81 as shown in FIG.

The second group holding frame 82 includes a holding portion 82a that is an annular portion that accommodates the second lens group L2 on the inner diameter side, and an arm portion 82b that protrudes from the outer peripheral surface of the holding portion 82a. . A cylindrical bearing portion 82c is provided at the tip of the arm portion 82b. The main body 81 is provided with a rotation shaft 83 extending substantially parallel to the optical axis A. The second group holding frame 82 is rotatably supported on the rotary shaft 83 via a bearing portion 82c.
The second group holding frame 82 is biased to the photographing position by a torsion spring 84 provided on the main body 81, and retracts to the retracted position against the biasing force of the torsion spring 84 at the retracted position shown in FIG. ing. The torsion spring 84 also has a function as a compression coil spring, and urges the second group holding frame 82 in a direction approaching the shutter unit 90 fixed to the main body portion 81.

  On the outer peripheral surface of the bearing portion 82c in the second group holding frame 82, a protrusion 85 is formed so as to protrude from the region opposite to the arm portion 82b to the outer diameter side of the bearing portion 82c. The second group holding frame 82 is retracted to the retracted position against the urging force of the torsion spring 84 by the protrusion 85 contacting the inner peripheral surface of the rotating cam cylinder 70.

When the power switch of the camera is turned on from the retracted state where the second lens unit L2 shown in FIG. 3 is retracted, the lens barrel 1 shifts to the photographing state shown in FIG. The zoom lens at this time is set to the wide position.
When the lens barrel 1 shifts from the retracted state to the photographing state, the rotating cam barrel 70 rotates to move the second group support unit 80 toward the subject in the optical axis direction.

FIG. 4 is a development view showing the inner peripheral surface of the rotating cam cylinder provided in the lens barrel shown in FIG.
The rotating cam cylinder 70 is formed with a cam groove 71 into which a cam follower 80a provided in the second group support portion is inserted. Three cam grooves 71 are provided at substantially equal intervals around the central axis of the rotating cam cylinder 70. In FIG. 4, a plurality of cam followers 80a are shown to show the movement of the cam follower 80a, but only one cam follower 80a is inserted into one cam groove 71.

The cam groove 71 has a region 71a for driving the second group support unit 80 when the lens barrel 1 is moved from the retracted state to the photographing state, and 2 when the zoom lens moves between the wide position and the tele position. The gradient of the cam groove is reversed between the region 71b for driving the group support portion 80 in the optical axis direction, and it is formed in a substantially V shape in plan view.
When the lens barrel 1 shifts from the retracted state to the photographing state, the cam follower 80a moves within the region 71a of the cam groove 71 according to the rotation of the rotating cam barrel 70, and changes the focal length of the zoom lens in the photographing state. When making it move, it moves in the area 71 b of the cam groove 71.

  Here, in the lens barrel 1, as described above, in the retracted state (the retracted state of the second lens group L 2) shown in FIG. It abuts on the surface 70a. In the developed view of the inner peripheral surface of the rotating cam cylinder 70 shown in FIG. 4, the contact position between the protrusion 85 and the inner peripheral surface 70 a of the rotating cam cylinder 70 will be described with reference character B.

When the rotary cam cylinder 70 rotates in the retracted state shown in FIG. 3, the second group support portion 80 performs a straight movement operation in the optical axis direction integrally with the second group holding frame 82.
FIG. 5 is a plan view of the rotating cam cylinder and the second group support portion provided in the lens barrel shown in FIG. 1 as viewed from the optical axis direction, and the second lens group L2 is disposed between the retracted position and the photographing position. It shows the state that was done.

  As shown in FIG. 4, in addition to the cam groove 71 that drives the second group support portion 80 in the optical axis direction, the second group holding frame 82 is placed between the retracted position and the photographing position on the inner peripheral surface of the rotating cam cylinder 70. A drive groove 72 is formed for driving between the two. The drive groove 72 is formed substantially parallel to the optical axis A. In FIG. 4, a plurality of protrusions 85 are shown to show the movement state of the protrusions 85, but only one protrusion 85 is inserted into one drive groove 72.

The projection 85 formed on the second group holding frame 82 is photographed in the optical axis direction while sliding on the inner peripheral surface of the rotating cam cylinder 70 in conjunction with the movement of the second group support unit 80 toward the photographer side. Move to the person side. Since the projection 85 is urged by the torsion spring 84 in the direction of pressing the inner peripheral surface 70 a of the rotating cam cylinder 70, the protrusion 85 is accommodated in the driving groove 72 in accordance with the rotation of the rotating cam cylinder 70 thereafter. .
FIG. 5 shows a state in which a part (about half) of the protrusion 85 is inserted into the drive groove 72. In FIG. 4, the movement trajectory of the protrusion 85 at this time will be described with reference C.

FIG. 6 is a plan view of the rotating cam cylinder and the second group support portion provided in the lens barrel shown in FIG. 1 as seen from the optical axis direction, and the lens mirror in a state where the second lens group L2 is disposed at the photographing position. A cylinder 1 is shown.
As shown in FIG. 6, when the projection 85 is inserted into the drive groove 72, the optical position of the second lens group L2 is at the photographing position substantially coincident with the optical axes of the other lens groups L1 and L3. At this photographing position, a positioning protrusion 82 d that protrudes from the holding portion 82 a of the second group holding frame 82 is inserted into a positioning notch 81 a that is formed on the inner peripheral surface of the main body portion 81.
In the second group support portion 80, the tip end portion of the positioning protrusion 82d presses the inner surface of the positioning cutout portion 81a by the urging force of the torsion spring 84, and the second lens group L2 has the zoom lens in the wide position and the tele position. When moving between the two, it is held at the shooting position.

  Here, when the second group holding frame 82 rotates about the rotation shaft 83 and moves from the retracted position to the photographing position, the subject side in the optical axis direction with respect to the main body 81 (direction approaching the shutter unit 90). To move to.

FIG. 7 is a view showing the bearing structure of the second group holding frame provided in the lens barrel shown in FIG.
7A shows the second group holding frame 82 in a state where the second lens group L2 is in the retracted position (see FIG. 2). Further, (c) shows the second group holding frame 82 in a state where the second lens group L2 is at the photographing position (see FIG. 1). (B) has shown the state in the middle of the 2nd group holding frame 82 shifting to the state shown to (c) from the state shown to (a).
Moreover, in each figure of Fig.7 (a)-(c), the top view which shows the mode of rotation of the 2 group holding frame 82, and the expanded view of the bearing part 82c are shown.

The bearing portion 82c of the second group holding frame 82 is formed in a cylindrical shape. The bearing portion 82 c is provided with a concave portion 86 formed by denting an end surface facing the main body portion 81 in the axial direction of the rotary shaft 83. The recess 86 is formed at two locations with the rotation shaft 83 interposed therebetween. The end surface of the rotation shaft 83 facing the main body 81 and the bottom surface 86a of the recess 86 are continuous surfaces via a cam surface 87 provided to be inclined with respect to a plane orthogonal to the optical axis A.
On the other hand, the main body 81 is formed with a convex portion 88 corresponding to the concave portion 86 provided in the bearing portion 82c. The surface portion of the main body portion 81 that faces the bearing portion 82 c and the front end surface 88 a of the convex portion 88 are continuous surfaces via the cam surface 89.

In the state where the second lens group L2 is in the retracted position (see FIGS. 2 and 3), as shown in FIG. 7A, the end surface 88a of the convex portion 88 faces the main body portion 81 in the bearing portion 82c. These surface portions define the position of the second lens unit L2 in the optical axis direction.
Then, in order to move to the photographing position, the second group holding frame 82 rotates around the rotation shaft 83, and the cam surface 87 of the bearing portion 82c and the cam surface 89 of the main body portion 81 as shown in FIG. When in the overlapping position, the bearing portion 82c moves in a direction approaching the main body portion 81 by the urging force of the torsion spring 84 in the optical axis direction. At this time, the cam surface 87 and the cam surface 89 slide.

In a state where the second lens group L2 is disposed at the photographing position (see FIGS. 1 and 6), the convex portion 88 is accommodated in the concave portion 86 as shown in FIG. 7C, and FIG. Compared to the state in which the second lens group L2 shown in FIG. The second lens unit L2 is closer to the shutter unit 90 at the photographing position than when it is at the retracted position (see FIGS. 1 and 2).
In the state shown in FIG. 7C, the cam surface 87 and the cam surface 89, the bottom surface 86a of the concave portion 86, and the tip end surface 88a of the convex portion 88 are not in contact with each other, and the optical axis direction of the second lens unit L2 This position is defined by the positioning surface portion 83e provided in the region on the inner diameter side of the concave portion 86 of the bearing portion 83c coming into contact with the main body portion 81 (see FIG. 1).

As described above, the second lens unit L2 performs a movement operation (straight forward operation) in the optical axis direction together with a movement operation (rotation operation) from the retracted position to the photographing position. Then, the lens barrel 1 is moved in the optical axis direction of the second lens group L2, and the position of the incident-side lens apex in the second lens group L2 in the optical axis direction (denoted with reference sign D in FIG. 1). Is overlapped with the position of the shutter unit 90 in the optical axis direction (indicated by E in FIG. 1).
When the second group holding frame 82 shifts from the photographing state shown in FIG. 1 to the retracted state shown in FIG. 2, the second group holding frame 82 moves in the reverse direction to the above-described FIGS. When the second group holding frame 82 rotates in the direction opposite to that described above, the cam surfaces 87 and 89 convert the rotational force acting on the second group holding frame 82 into the force in the optical axis direction, and the second group The holding frame 82 is moved in a direction away from the shutter unit 90 (photographer side). The second group holding frame 82 rotates around the rotation axis 83, but the cam surfaces 87 and 89 separate the second group holding frame 82 from the shutter unit 90 immediately after the second group holding frame 82 starts rotating. Since the second group holding frame 82 and the shutter unit 90 do not interfere with each other, they are moved in the direction.

  Here, when compared with a lens barrel (not shown) in which the second group holding frame 82 does not move in the optical axis direction in conjunction with the rotation operation, the lens barrel 1 of the present embodiment is in the second lens group L2 in the photographing state. Therefore, the size of the lens barrel 1 in the optical axis direction can be shortened by the amount of movement of the second group holding frame 82 in the optical axis direction.

As described above, since the second group holding frame 82 moves in the optical axis direction along with the rotation operation, the projection 85 also moves in the optical axis direction in conjunction with this.
On the other hand, since the drive groove 72 described above is formed in parallel to the optical axis A, when the second group holding frame 82 moves in the optical axis direction along with the rotation operation, the protrusion 85 is formed in the drive groove 72. To move.

In the state shown in FIG. 6, the lens barrel 1 has the second lens unit L2 disposed at the photographing position, but the entire photographing optical system is not completely at the wide position, and further rotates from the state shown in FIG. The cam cylinder 70 rotates.
When the rotating cam cylinder 70 rotates, the cam follower 80a is guided to the cam groove 71, the second group support unit 80 moves to the subject side in the optical axis direction, and the zoom lens becomes the wide position.
On the other hand, since the second lens group L2 is already at the photographing position and the positioning projection 82d is in contact with the positioning notch 81a, if the second group holding frame 82 is rotated beyond the state shown in FIG. There is a possibility that a load is applied.

On the other hand, the rotary cam cylinder 70 of the present embodiment is provided with a clearance groove 73 formed continuously with the drive groove 72. The escape groove 73 is formed in parallel with the cam groove 71.
Since the second group holding frame 82 at the photographing position moves in the optical axis direction integrally with the main body 81, the protrusion 85 moves along the same locus as the cam follower 80a. Since the escape groove 73 is formed in parallel with the cam groove 71, even if the second group support portion 80 moves in the optical axis direction with the second lens group L2 disposed at the photographing position, the protrusion 85 is Since it moves in the escape groove 73, the second group holding frame 82 does not rotate around the rotation shaft 83.
When the zoom lens is moved between the wide position and the tele position, the protrusion 85 moves in the escape groove 73, and the second lens unit L2 is held at the photographing position.

According to the lens barrel 1 of the embodiment described above, the following effects can be obtained.
(1) As a mechanism for driving the second lens group L2, which is a retracting optical system, between the retracted position and the photographing position, a mechanism for driving the second group holding frame 82 that holds the second lens group L2 by an electric motor or the like. However, in this case, the lens barrel 1 may be enlarged.
Further, a projection having a cam surface formed at the tip is provided on the CCD table 11, and when the second group support unit 80 approaches the CCD table 11 during the retracting operation, the projection drives the second group holding frame 82 to the retracted position. A mechanism is considered. However, in this case, since the reaction force from the second group holding frame 82 acts on the CCD table 11 in the optical axis direction, it is necessary to stiffen the CCD table 11.
On the other hand, in the lens barrel 1 of the present embodiment, the second group holding frame 82 is driven by the drive groove 72 formed on the inner peripheral surface of the rotating cam cylinder 70 and the projection 85 formed on the second group holding frame 82. Therefore, the lens barrel 1 can be reduced in size. Further, it is not necessary to stiffen the CCD table 11.
(2) Since the torsion spring 84 that biases the second lens group L2 to the photographing position is provided, the position of the second lens group L2 during photographing is stabilized. Further, since the torsion spring 84 has a function of a biasing spring that biases the second group holding frame 82 to the main body 81 of the second group support unit 80 at the photographing position, the space efficiency is good.
(3) In the photographing state shown in FIG. 1, the positioning surface portion 83e abuts on the main body portion 81 to define the position of the second lens group, so that it is possible to prevent the convex portion 88 from being loaded.
(4) Since the protrusion 85 is provided on the bearing portion 82c, the second lens unit L2 can be moved greatly with a small amount of rotation of the bearing portion 82c.
(5) Compared to the lens barrel in which the position of the second lens unit L2 and the shutter unit 90 in the optical axis direction does not overlap in the photographing state, the lens barrel 1 of the present embodiment includes the second lens unit L2 and the shutter unit. 90 can be made closer to each other, so that the dimension in the optical axis direction can be shortened. Further, since the first lens unit L1 and the second lens unit L2 are close to each other, it is advantageous in securing the optical performance of the entire optical system.
(6) Since the drive groove 72 is provided parallel to the optical axis, the protrusion 85 is formed on the inner peripheral surface 70a of the rotating cam cylinder 70 even if the second group holding frame 82 moves in the optical axis direction in conjunction with the rotation operation. I won't get on.
(7) Since the escape groove 73 is provided in parallel with the cam groove 71, when the second group support portion 80 is driven in the optical axis direction, the second group holding frame 82 does not rotate and the second lens group L2 is positioned at the photographing position. Can be retained.
(8) Since the cam surfaces 87 and 89 for driving the second group holding frame 82 in the optical axis direction are provided around the rotation shaft 83, the second group holding frame 82 can be stably driven in the optical axis direction. .

[Deformation]
The present invention is not limited to the embodiment described above, and various modifications and changes as shown below are possible, and these are also included in the technical scope of the present invention.
(1) In the lens barrel of the embodiment, a driving cam for driving the second lens group between the retracted position and the photographing position on the rotating cam cylinder that drives the second lens group as a retracting optical system in the optical axis direction ( However, the drive groove is not limited to this, and may be formed on another member (for example, a dedicated moving member).
(2) In the embodiment, the escape groove is provided in parallel to the cam groove. However, the embodiment is not limited to this as long as the protrusion does not run on the inner peripheral surface of the rotating cam cylinder. May be recessed in a wide range.
(3) Although the protrusion of the embodiment is provided on the opposite side of the arm portion across the rotation shaft in the bearing portion, the protrusion is not limited thereto, and may be provided in another portion of the bearing portion.
(4) Although the lens barrel of the embodiment is provided in the camera, the present invention is not limited thereto, and may be provided in other optical devices such as a telescope and binoculars.

It is sectional drawing of the lens-barrel of embodiment, and has shown the imaging | photography state. The retracted state of the lens barrel shown in FIG. 1 is shown. FIG. 2 is a plan view (retracted position) of the rotating cam cylinder and the second group support portion provided in the lens barrel shown in FIG. 1 as viewed from the optical axis direction. FIG. 2 is a development view showing an inner peripheral surface of a rotary cam cylinder provided in the lens barrel shown in FIG. 1. FIG. 2 is a plan view (in the middle of movement) of the rotating cam cylinder and the second group support portion provided in the lens barrel shown in FIG. 1 as viewed from the optical axis direction. FIG. 2 is a plan view (photographing position) of a rotating cam cylinder and a second group support portion provided in the lens barrel shown in FIG. It is a figure which shows the bearing structure of the 2 group holding frame with which the lens barrel shown in FIG. 1 was equipped. FIG. 2 is a plan view (wide position) of the rotating cam cylinder and the second group support portion provided in the lens barrel shown in FIG. 1 as viewed from the optical axis direction.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Lens barrel: 70 Rotating cam cylinder: 70 Inner peripheral surface part: 72 Drive groove: 82 2nd group holding frame: 83 Rotating shaft: 85 Protrusion: L2 2nd lens group

Claims (8)

A first position and a second position in a plane orthogonal to the optical axis are held by a holding frame pivotally supported by a shaft portion parallel to the optical axis, and the holding frame rotates around the shaft portion. A lens that moves between and
A protrusion provided on the holding frame and protruding in a direction perpendicular to the optical axis;
A holding surface portion that holds the lens in the first position in contact with the protrusion, and a concave portion formed in a part of the holding surface portion, and a movable member that is movable with respect to the holding frame. A lens barrel,
The protrusion transitions between a state in contact with the holding surface portion and a state accommodated in the recess as the moving member moves,
The lens barrel, wherein the lens is held at the second position in a state where the protrusion is accommodated in the recess. The lens barrel according to claim 1,
A lens barrel comprising: a biasing portion that biases the holding frame in a direction in which the protrusion presses the holding surface portion of the moving member. In the lens barrel according to claim 1 or 2,
The protrusion is accommodated in the recess after sliding on the holding surface portion by moving the moving member in the first direction,
The concave portion includes an accommodation maintaining region for maintaining the state in which the protrusion is accommodated even when the moving member further moves in the first direction in a state in which the projection is accommodated. Tube. In the lens barrel according to claim 3,
The moving member includes a cam groove that moves the holding frame in the optical axis direction by moving in the first direction in a state in which the protrusion is accommodated in the recess,
The accommodation maintaining area is a parallel groove formed in parallel with the cam groove,
When the holding frame moves in the optical axis direction, the protrusion moves in the parallel groove portion. In the lens barrel according to any one of claims 1 to 4,
The holding frame moves in the optical axis direction with respect to the moving member in conjunction with a rotation operation around the shaft portion,
The recess provided in the moving member includes a linear groove provided in parallel with the optical axis,
The projection moves in the linear groove when the holding frame moves in the optical axis direction. In the lens barrel according to any one of claims 1 to 5,
The holding frame includes a bearing portion that is pivotally supported by the shaft portion, a holding portion that holds the lens, and a connection portion that connects the bearing portion and the holding portion,
The lens barrel according to claim 1, wherein the protrusion is formed on the bearing portion. In the lens barrel according to any one of claims 1 to 6,
The moving member is a cylinder that houses the holding frame on the inner diameter side,
The holding surface portion and the recess are each formed on an inner peripheral surface of the moving member,
The lens barrel according to claim 1, wherein the protrusion shifts between a state in which the moving member is in contact with the holding surface portion and a state in which the moving member is accommodated in the concave portion by rotating around the center thereof. An optical apparatus comprising the lens barrel according to any one of claims 1 to 7.

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