JP2000066263A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel having compact structure and capable of easily tilting and/or swinging an optical system. SOLUTION: An optical system 2 is held by a frame member 3, and four pins 3a, 3b, 3c and 3d are provided on the outer periphery part of the member 3. The pins 3a, 3b, 3c and 3d pierce through the straight advance grooves 4a, 4b, 4c and Ad of a reference barrel 4, and are movably fit in a cam 6. The barrel 4 rotatably supports a cam barrel 5 with an optical axis I as the center, and the optical system 2 and the member 3 are supported to be tilted to the optical axis I. The cam 6 makes the tilt angle of either pair of pins 3a and 3c to the optical axis I different from that of the other pair of pins 3b and 3d to the optical axis I in the midst of the rotating operation of the cam barrel 5. As a result, the swing and tilt of the optical system 2 is realized because it is tilted and/or swung in accordance with the rotating position of the cam barrel 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lens barrel for tilting and / or swinging an optical system by a rotating member such as a cam barrel.

[0002]

2. Description of the Related Art A lens barrel having a tilting function that can shift the optical axis of a photographing optical system and the center of a film surface using a bellows attachment has been known. Such a lens barrel includes a first seat plate mounted on a mount portion on the camera body side, a second seat plate having a mount portion for mounting a photographic optical system, a first seat plate and a second seat plate.
And a support member for slidably supporting the first and second seat plates.

Japanese Utility Model Laid-Open Publication No. 57-139906 discloses a first unit for performing shift and tilt, a second unit for performing tilt and tilt, and a first unit for connecting the first and second units.
Disclosed is a lens barrel having a tilting function, which includes a coupling portion and a second coupling portion provided in the first unit and coupled to the camera body. This lens barrel is divided into three parts in the optical axis direction like a front second unit, an intermediate first coupling unit, and a rear first unit. This lens barrel is provided with an arc-shaped slide mechanism between the second unit and the first coupling part so that the lens barrel can be tilted in various directions.
A mutually rotatable revolving mechanism is provided between the first coupling unit and the first unit.

[0004]

However, a lens barrel using a bellows attachment has a problem that it is inconvenient to carry and difficult to handle. Further, the lens barrel disclosed in Japanese Utility Model Laid-Open No. 57-139906 has a problem that the mechanism is complicated, the number of components is large, and the operation is complicated.

[0005] An object of the present invention is to provide a lens barrel that can easily tilt and / or swing an optical system with a compact structure.

[0006]

The present invention solves the above-mentioned problems by the following means. In addition, in order to make it easy to understand, description is given with reference numerals corresponding to the embodiment of the present invention, but the present invention is not limited to this. That is, according to the first aspect of the present invention, the optical system (2), the holding frame (3) for holding the optical system, and the holding frame are engaged with each other, and the optical system is tilted and / or tilted according to the rotational position. Or, a lens barrel (1) characterized by including a cam barrel (5) to be swung.

According to a second aspect of the present invention, in the lens barrel according to the first aspect, the holding frame has a plurality of engaging portions (3a, 3b, 3c, 3d) directly or indirectly on an outer peripheral portion thereof. The cam cylinder is movably engaged with the engaging portion,
A cam (6) for tilting the optical system with respect to the optical axis (I)
The cam includes at least one engaging portion (3a, 3c) and another engaging portion (3) during rotation of the cam barrel.
b, 3d) are different from each other in the position in the optical axis direction or the inclination angle with respect to the optical axis.

According to a third aspect of the present invention, in the lens barrel according to the second aspect, the engaging portion is provided with four pins (3a, 3a, 3
b, 3c, 3d), and the cam includes a pair of pins (3a, 3c; 3b, 3d) facing each other around the optical axis.
The cam grooves (60, 60) that move in the optical axis direction or tilt with respect to the optical axis than the other pair of pins (3b, 3d; 3a, 3c).
61, 62, 63, 64, 65).

According to a fourth aspect of the present invention, in the lens barrel according to the second or third aspect, at least a part of the cam has an inclined surface (61) contacting the engaging portion.
d, 62d, 64d, 65d).

According to a fifth aspect of the present invention, in the lens barrel according to the second or third aspect, the engagement portion has a spherical contact portion with the cam. It is a tube.

According to a sixth aspect of the present invention, in the lens barrel according to any one of the first to fifth aspects,
A lens barrel comprising an encoder (11) for detecting a rotation angle of the cam barrel from a reference position as an absolute position.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, a first embodiment of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a development view of the lens barrel according to the first embodiment of the present invention. The lens barrel 1 according to the embodiment of the present invention includes an optical system 2, a frame member 3, a reference cylinder 4, a cam cylinder 5, and a cam 6.

The optical system 2 is a lens constituting at least a part of the photographing optical system. The frame member 3 is a cylindrical member that holds the optical system 2. The outer periphery of the optical system 2 is fitted into the inner periphery of the frame member 3. The four pins 3 are provided on the outer peripheral portion of the frame member 3 at intervals of 90 degrees around the optical axis I.
a, 3b, 3c, 3d are provided to protrude.

The reference cylinder 4 is a fixed cylinder that rotatably supports the cam cylinder 5 about the optical axis I. The reference tube 4 includes the optical system 2
And to allow inclined at a predetermined angle with respect to the frame member 3 is the optical axis I, an inner diameter phi ₂ is larger than the outer diameter phi ₁ of the frame member 3.
The reference cylinder 4 has straight grooves 4a, 4b, 4c, and 4d. A cam cylinder 5 is rotatably supported on the outer peripheral portion of the reference cylinder 4.

The rectilinear grooves 4a, 4b, 4c, 4d regulate the rotation of the optical system 2 and the frame member 3 about the optical axis I, and also reduce the inclination of the optical system 2 and the frame member 3 with respect to the optical axis I. This is a permissible through groove. Pins 3a, 3b, 3c, 3d are movably fitted in the rectilinear grooves 4a, 4b, 4c, 4d, respectively. The straight grooves 4a, 4b, 4c, 4d are:
A predetermined length is formed in parallel with the optical axis I at intervals of 90 degrees around the optical axis I.

The cam barrel 5 is a member for tilting and / or swinging the optical system 2 and the frame member 3 according to the rotational position. The cam cylinder 5 includes connecting portions 5a, 5b, 5c, 5
d and a cam 6. Connecting parts 5a, 5b, 5
Reference numerals c and 5d denote members that connect the cam cylinder 5 so that the cam cylinder 5 does not separate back and forth with the cam 6 as a boundary. Connecting parts 5a, 5b,
5c and 5d are fixed to the outer peripheral portion of the cam cylinder 5 at 90-degree intervals about the optical axis I.

The cam 6 is a member for movably fitting the distal ends of the pins 3a, 3b, 3c, 3d, and for inclining the optical system 2 and the frame member 3 with respect to the optical axis I. The cam 6 is a through groove that makes the inclination angle of the pair of pins 3a and 3c with respect to the optical axis I different from the inclination angle of the other pair of pins 3b and 3d with the optical axis I during the rotation operation of the cam barrel 5. is there. The cam 6
It is formed along the circumferential direction of the cam cylinder 5 within a range of 360 degrees around the optical axis I. The cam 6 has a cam groove 60,
61, 62, 63, 64 and 65.

FIG. 2 is a developed view of a cam barrel in the lens barrel according to the first embodiment of the present invention. Cam groove 60, 6
Reference numeral 3 denotes a groove for positioning the pins 3a, 3b, 3c, 3d in a plane perpendicular to the optical axis I (parallel to the image plane). The cam grooves 60 and 63 are linear grooves formed in the circumferential direction around the optical axis I, as shown in FIGS. The cam grooves 60 and 63 have the same shape as shown in FIG. The cam groove 60 has connection points 60a,
At 60b, they are connected to the linear grooves 65b and 61a, respectively. The cam groove 63 is connected to the straight grooves 62b and 64a at connection points 63a and 63b.

The cam grooves 61, 65 are provided with the pins 3a, 3b, 3
V-shaped grooves for inclining c and 3d toward the front side (subject side). The cam groove 61 includes a straight groove 61a extending forward from the connection point 60b, a straight groove 61b extending rearward (imaging plane side) from the straight groove 61a, and a bend where the straight groove 61a and the straight groove 61b intersect. A portion 61c. The cam groove 65 includes a linear groove 65a extending forward from the linear groove 64b, a linear groove 65b extending rearward from the linear groove 65a, and a linear groove 65a.
And a bent portion 65c where the straight groove 65b intersects. Each of the cam grooves 61 and 65 has the same shape as shown in FIG.

The cam grooves 62, 64 are provided with pins 3a, 3b, 3
This is an inverted V-shaped groove that tilts c and 3d backward. The cam groove 62 has a straight groove 62a extending rearward from the rectilinear groove 61b.
And a linear groove 62b extending forward from the linear groove 62a.
Bent portion 62 where the straight groove 62a and the straight groove 62b intersect
c. The cam groove 64 includes a linear groove 64a extending rearward from the cam groove 63, a linear groove 64b extending forward from the linear groove 64a, and a bent portion 64c where the linear groove 64a and the linear groove 64b intersect. Each of the cam grooves 62 and 64 has the same shape as shown in FIG.

The cam grooves 60, 61, 62, 63, 64, 6
5 are formed within a range of 60 degrees around the optical axis I. Straight grooves 61a, 61b, 62a, 62
Each of b, 64a, 64b, 65a, and 65b is formed within a range of 30 degrees around the optical axis I. The straight groove 61b and the straight groove 62a are connected at a connection point 66c and extend in the same direction. The straight groove 64b and the straight groove 65a are connected at a connection point 67c and extend in the same direction.

FIG. 3 is a sectional view showing a state cut along the line III-IIIA in FIG. FIG. 4 is a sectional view taken along the line IV-I of FIG.
It is sectional drawing which shows the state cut | disconnected by VA line. FIG. 5 is a cross-sectional view showing a state cut along the line V-VA in FIG. The line III-IIIB, the line IV-IVB and the line V in FIG.
The members cut along the line -VB are shown in parentheses in FIGS.

The contact surfaces 60d and 63d are connected to the pins 3a and 3
b, 3c, and 3d are surfaces that contact and guide them. The contact surfaces 60d and 63d are planes perpendicular to the optical axis I, as shown in FIG.
a, 3b, 3c, 3d.

Contact surfaces 61d, 62d, 64d, 65d
Is an inclined surface that guides the pins 3a, 3b, 3c, 3d while contacting them. Contact surfaces 61d, 62d, 6
4d and 65d guide the pins 3a, 3b, 3c and 3d so that they are inclined with respect to the optical axis I as shown in FIGS.

As shown in FIG. 4, the contact surfaces 61d and 65d are inclined forward by an angle θ from a plane perpendicular to the optical axis I. As shown in FIG. 2, the contact surface 61d has the maximum angle θ at the bent portion 61c, and the connection points 60b, 66
The angle θ is zero at c. The contact surface 61d has a bent portion 61
The angle θ gradually decreases from c toward the connection points 60b and 66c. On the other hand, the contact surface 65d has the maximum angle θ at the bent portion 65c, and has zero angle θ at the connection points 60a and 67c. The contact surface 65d extends from the bent portion 65c to the connection point 6
The angle θ gradually decreases toward 0a and 67c.

As shown in FIG. 5, the contact surfaces 62d and 64d are inclined by an angle θ rearward from a plane perpendicular to the optical axis I. As shown in FIG. 2, the contact surface 62d has a maximum angle θ at the bent portion 62c, and the angle θ gradually decreases from the bent portion 62c toward the connection points 66c and 63a. On the other hand, the contact surface 64d has an angle θ at the bent portion 64c.
Are maximum, and the connection points 63b, 6
7c gradually decreases toward 7c.

Next, the operation of the lens barrel according to the first embodiment of the present invention will be described. FIG. 6 is a diagram illustrating the operation of the lens barrel according to the first embodiment of the present invention. FIG.
(A) to (M) show the case where the pins 3a, 3b, and 3 are moved when the cam barrel 5 rotates by 30 degrees from the reference position around the optical axis I.
It is a figure which shows the state of c and 3d. In FIG. 6, "M"
Indicates that any one of the pins 3a, 3b, 3c, and 3d has the optical axis I
Shows a case where it is located in a plane perpendicular to. "L"
Indicates that any one of the pins 3a, 3b, 3c, and 3d has the optical axis I
FIG. 6 shows a case in which the camera is tilted forward from a plane perpendicular to.
"H" indicates that one of the pins 3a, 3b, 3c, 3d is
This shows a case where it is tilted backward from a plane perpendicular to the optical axis I.

As shown in FIG. 6A, when the cam barrel 5 is at the reference position, the pins 3a, 3b, 3c, 3d
Both are "M". For this reason, as shown in FIG. 3, the optical system 2 is in a neutral state (neutral), and the optical axis I is perpendicular to the imaging plane. As shown in FIG. 6B, when the cam cylinder 5 rotates 30 degrees from the reference position, the pin 3
a is "H", the pin 3b is "M", the pin 3c is "L", and the pin 3d is "M", and the state is as shown in FIG. As a result, as shown in FIG. 5, the optical system 2 includes the pins 3b and 3d.
With the (horizontal direction) as the rotation axis, the pin 3a (upper side) tilts rearward, and the pin 3c (lower side) tilts forward to tilt up. As shown in FIG. 6C, when the cam cylinder 5 rotates 60 degrees from the reference position, the pin 3a becomes “M” and the pin 3b
Is "L", the pin 3c is "M", and the pin 3d is "H", which is the state shown in parentheses in FIG. as a result,
As shown in FIG. 5, the optical system 2 swings left with the pin 3b (right side) inclined forward and the pin 3d (left side) inclined rearward with the pins 3a and 3c (vertical directions) as rotation axes. .

As shown in FIG. 6E, when the cam barrel 5 rotates 120 degrees from the reference position, the pin 3a is "M", the pin 3b is "H", the pin 3c is "M", and the pin 3d is "M". L ", and becomes the state shown in parentheses in FIG. As a result, as shown in FIG. 5, the optical system 2 includes the pins 3a and 3c.
With the (vertical direction) as the axis of rotation, the pin 3b (right side) tilts rearward, and the pin 3d (left side) tilts forward to swing light. As shown in FIG. 6H, when the cam cylinder 5 rotates 210 degrees from the reference position, the pin 3a becomes “L” and the pin 3
b becomes “M”, the pin 3c becomes “H”, and the pin 3d becomes “M”, and the state is as shown in FIG. As a result, as shown in FIG. 4, in the optical system 2, the pin 3a (upper side) is tilted forward and the pin 3c (lower side) is tilted rearward with the pins 3b and 3d (horizontal direction) as rotation axes. , Tilt down. Thus, by rotating the cam barrel 5 within a range of 360 degrees from the reference position, the optical axis I of the pins 3a, 3b, 3c, 3d is changed.
Can be changed. For this purpose, the optical system 2 can be tilted or swung to lift the optical system 2.

The lens barrel according to the first embodiment of the present invention has the following effects. (1) In the first embodiment of the present invention, the cam grooves 60, 61,
62, 63, 64, 65 and pins 3a, 3b, 3c, 3d
The position of the fitting is changed in accordance with the rotational position of the cam barrel 5, and the optical system 2 is tilted or swung.
As a result, there is no need to divide the lens barrel or use an arc-shaped slide mechanism that is difficult to process, so that the tilting mechanism is simplified and the lens barrel 1 can be made compact. . Further, since the optical system 2 can be reliably lifted only by rotating the cam barrel 5, the operation is simplified, and the control can be automatically performed by a drive source such as a motor.

(2) In the first embodiment of the present invention, the pins 3a, 3b, 3 are formed by the cam grooves 61, 62, 64, 65.
When guiding c and 3d, these pins 3a and 3d
b, 3c and 3d are inclined with respect to the optical axis I so that the contact surface 6
1d, 62d, 64d, and 65d are inclined surfaces. For this reason, when the pins 3a, 3b, 3c, 3d are inclined, the pins 3a, 3b, 3c, 3d are tilted by the cam grooves 61, 62, 64, 65.
a, 3b, 3c, 3d can be prevented from being restrained.

(3) In the first embodiment of the present invention, the pin 3
a, 3b, 3c, 3d, depending on the position of the contact surface 61d,
The angles θ of 62d, 64d, and 65d are changed. For this purpose, the angle θ of the contact surfaces 61d, 62d, 64d, 65d is set to an appropriate angle in accordance with the positions of the pins 3a, 3b, 3c, 3d, and the pins 3a, 3b, 3c, 3d are securely connected. Can guide.

(Second Embodiment) FIG. 7 is a sectional view of a lens barrel according to a second embodiment of the present invention. In the following, the same members as those shown in FIGS. 1 and 2 will be denoted by the same reference numerals, and detailed description thereof will be omitted. The second embodiment of the present invention differs from the first embodiment of the present invention in that the contact surfaces 61d, 62d, 64d, and 65d are planes perpendicular to the optical axis I and the link mechanism 7 is provided. FIG.

The link mechanism 7 includes a first link member 70
, A second link member 71, and a pin 72. The link mechanism 7 is provided between the pins 3a, 3b, 3c, 3d and the frame member 3. First link member 7
4 are fixed to the outer peripheral portion of the frame member 3 around the optical axis I at intervals of 90 degrees. Second link member 7
4 are arranged in parallel with the optical axis I. The second link member 71 has pins 3a, 3b, 3c, 3 at one end.
d is fixed, and the first link member 70 is connected to the other end. The pin 72 is a member that rotatably connects the first link member 70 and the second link member 71. The optical system 2 and the frame member 3 are indirectly connected to the pins 3a, 3b, 3c, 3d via the link mechanism 7.

Next, the operation of the lens barrel according to the second embodiment of the present invention will be described. When the cam barrel 5 rotates, the cam 6 makes the position of the pair of pins 3a and 3c in the direction of the optical axis I different from the position of the other pair of pins 3b and 3d in the direction of the optical axis I. As shown in FIG. 7, pins 3a, 3b and pins 3c,
When the position in the direction of the optical axis I with respect to 3d changes, the optical system 2 and the frame member 3 are inclined by an angle θ with respect to a plane orthogonal to the optical axis I. As a result, the optical system 2 can be tilted or swung to lift the optical system 2.

The lens barrel according to the second embodiment of the present invention has the following effects in addition to the effects of the first embodiment. The second embodiment of the present invention includes a contact surface 61
Since the step of forming inclined surfaces on d, 62d, 64d, and 65d can be omitted, the tilting mechanism can be further simplified, and the lens barrel 1 can be easily manufactured.

(Third Embodiment) FIG. 8 is a sectional view of a lens barrel according to a third embodiment of the present invention. Third of the present invention
The embodiment is different from the first embodiment in that the contact surfaces 61d, 6d
This is another embodiment in which 2d, 64d, and 65d are planes perpendicular to the optical axis I, and the tips of the pins 3a, 3b, 3c, and 3d are spherical. Pins 3a, 3b, 3
c and 3d are contact surfaces 61d and 62 as shown in FIG.
The portions that are in contact with d, 64d, and 65d are formed in a spherical shape. For this purpose, the contact surfaces 61d, 62d, 64d,
Even if the inclined surface is not provided on 65d, the pin 3
a, 3b, 3c, 3d can be inclined.

The lens barrel according to the third embodiment of the present invention has the following effects in addition to the effects of the second embodiment. In the third embodiment of the present invention, the pins 3a,
Since there is no need to provide the link mechanism section 7 between the frame members 3b, 3c, and 3d, the structure and processing of the tilt mechanism section are further simplified, and the lens barrel 1 is easily manufactured. Can be.

(Fourth Embodiment) FIG. 9 is a block diagram of a lens barrel according to a fourth embodiment of the present invention. The mode selection unit 8 illustrated in FIG. 9 is a changeover switch that selects a mode related to a tilt state such as a neutral state, a tilt, and a swing. The CPU 9 is a central processing unit that controls driving of the driving unit 10 based on the selected mode. CP
U9 controls the drive unit 10 based on the pulse signal output from the encoder 11 so that the cam cylinder 5 rotates forward or backward by a predetermined angle. The drive unit 10 is a drive source such as a motor that rotates the cam barrel 5. The drive unit 10 rotates the cam barrel 5 so as to switch to a tilted state according to the selected mode. The encoder 11 is a cam cylinder 5
The rotation angle from the reference position is detected as an absolute position. The encoder 11 detects an absolute position of the cam cylinder 5 in the angular direction about the optical axis I, and outputs a pulse signal corresponding to the absolute position to the CPU 9.

The lens barrel according to the fourth embodiment of the present invention has the following effects in addition to the effects of the first to third embodiments. In the fourth embodiment of the present invention, the posture of the optical system 2 can be quickly switched by automatically controlling the tilting state of the optical system 2 by the CPU 9 based on the mode selected by the photographer.

The present invention is not limited to the embodiments described above, and various modifications or changes can be made as described below, and these are also within the equivalent scope of the present invention. (1) In the embodiment of the present invention, the case of tilting and swinging the optical system 2 has been described as an example, but only one of the operations may be performed.

(2) In the embodiment of the present invention, the posture of the optical system 2 is changed by rotating the cam barrel 5 by 30 degrees from the reference position. The tilt state of the system 2 can be freely changed.

(3) In the embodiment of the present invention, the inclination angle of the pair of pins 3a, 3c with respect to the optical axis I or the position in the direction of the optical axis I, and the inclination angle of the other pair of pins 3b, 3d with respect to the optical axis I. Alternatively, the position is different from the position in the optical axis I direction, but the present invention is not limited to this. For example, the pins 3a, 3b, 3
The inclination angle or the position in the direction of the optical axis I with respect to the optical axis I of at least one of c and 3d may be different from the inclination angle or the position in the direction of the optical axis I with respect to the others.

(4) In the embodiment of the present invention, four pins 3a, 3b,
The case where 3c and 3d are arranged has been described as an example, but the number of pins is not limited to this.

(5) In the embodiment of the present invention, the cam groove 6
Pin 3 engaging with 0, 61, 62, 63, 64, 65
Although a, 3b, 3c, and 3d have been described as examples, other cams and followers (cam followers) may be used.

(6) The embodiment of the present invention has been described by taking as an example the case where the present invention is applied to a photographing device such as a lens-integrated still camera or a digital camera. The present invention may be applied to an intermediate adapter or the like. Further, the camera may be mounted as a tilting device on a part or all of a lens integrated camera, an interchangeable lens, or a lens barrel of an intermediate adapter. Furthermore, the present invention is not limited to a photographing device that tilts or swings the optical system 2 at the time of photographing. For example, the present invention can be applied to an optical axis alignment device for adjusting optical performance, a light beam projection device, and the like. it can.

[0047]

As described above in detail, according to the present invention, the holding frame for holding the optical system is engaged with the cam barrel, and the optical system is tilted and / or tilted according to the rotational position of the cam barrel. Alternatively, since the optical system is swung, the optical system can be easily tilted and / or swung with a compact structure.

[Brief description of the drawings]

FIG. 1 is a development view of a lens barrel according to a first embodiment of the present invention.

FIG. 2 is a development view of a cam barrel in the lens barrel according to the first embodiment of the present invention.

FIG. 3 is a sectional view showing a state cut along a line III-IIIA in FIG. 2;

FIG. 4 is a sectional view showing a state cut along a line IV-IVA in FIG. 2;

FIG. 5 is a sectional view showing a state cut along a line V-VA in FIG. 2;

FIG. 6 is a diagram illustrating an operation of the lens barrel according to the first embodiment of the present invention.

FIG. 7 is a sectional view of a lens barrel according to a second embodiment of the present invention.

FIG. 8 is a sectional view of a lens barrel according to a third embodiment of the present invention.

FIG. 9 is a block diagram of a lens barrel according to a fourth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 lens barrel 2 optical system 3 frame member 3a, 3b, 3c, 3d pin 4 reference cylinder 4a, 4b, 4c, 4d rectilinear groove 5 cam cylinder 6 cam 7 link mechanism 11 encoder 60, 61, 62, 63, 64, 64 65 Cam groove 61d, 62d, 64d, 65d Contact surface I Optical axis

Claims (6)

[Claims] 1. An optical system, comprising: a holding frame that holds the optical system; and a cam barrel that engages with the holding frame and tilts and / or swings the optical system according to a rotational position. Characteristic lens barrel. 2. The lens barrel according to claim 1, wherein the holding frame has a plurality of engaging portions directly or indirectly on an outer peripheral portion thereof, and the cam barrel is movable with the engaging portions. A cam that engages and tilts the optical system with respect to the optical axis, wherein the cam is positioned in the optical axis direction between at least one engagement portion and another engagement portion during rotation of the cam barrel. Or a lens having a different inclination angle with respect to the optical axis. 3. The lens barrel according to claim 2, wherein the engaging portion is four pins provided at intervals of about 90 degrees about an optical axis, and the cam is an optical axis. A pair of pins facing each other around
A cam groove that moves in the optical axis direction or tilts with respect to the optical axis than the other pair of pins. 4. The lens barrel according to claim 2, wherein the cam has an inclined surface on at least a part thereof, the cam being in contact with the engagement portion. . 5. The lens barrel according to claim 2, wherein the engaging portion has a spherical contact portion with the cam. 6. Any one of claims 1 to 5
3. The lens barrel according to claim 1, further comprising: an encoder that detects a rotation angle of the cam barrel from a reference position as an absolute position.