JP6752909B2 - A lens barrel having a generatrix circumferential angle adjuster for a cylindrical lens and a generatrix circumferential angle adjuster for a cylindrical lens. - Google Patents

Description

The present invention relates to a lens barrel having a generatrix circumferential angle adjusting device for a cylindrical lens and a generatrix circumferential angle adjusting device for a cylindrical lens.

For example, in cinemascope-type shooting / playback (projection) using movie film, the size in the left-right direction is compressed / reduced to about half of the movie screen (wide screen) at the time of shooting and playback. In, the compressed and captured image is restored to its original size, enlarged, and projected as a wide-screen image. The compression of the image at the time of photographing and the restoration of the image at the time of reproduction are performed, for example, by using a photographing lens and a projection lens provided with a cylindrical lens as shown in Patent Document 1.

Japanese Unexamined Patent Publication No. 3-25407

However, when a plurality of cylindrical lenses are provided, it is necessary to match the generatrix of each cylindrical lens with each other. Therefore, an object of the present invention is to provide a generatrix circumferential angle adjusting device for a cylindrical lens capable of matching the generatrix of a plurality of cylindrical lenses with each other.

In order to solve the above problems, the lens circumferential angle adjusting device for the cylindrical lens is provided on the lens holding cylinder for holding the cylindrical lens, the outer peripheral cylinder for arranging the lens holding cylinder on the inner peripheral side, and the outer peripheral side of the lens holding cylinder. A cam member having a cam surface eccentric with respect to an axis intersecting the optical axis of the lens holding cylinder, and a cam member engaging portion formed on the outer peripheral cylinder and engaging with the cam member in the circumferential direction of the optical axis. It is assumed that the lens holding cylinder is supported in at least three directions at equal intervals in the circumferential direction of the optical axis with respect to the outer peripheral cylinder.

Further, in addition to the above invention, the above-mentioned generatrix circumferential angle adjusting device for a cylindrical lens includes an adjusting ring for arranging an outer peripheral cylinder on the inner peripheral side and a lens holding cylinder by rotating the optical axis of the adjusting ring in the circumferential direction. Is provided with a lens holding cylinder moving mechanism for moving the lens along the optical axis.

Further, in addition to the above invention, in the lens holding cylinder moving mechanism of the bus line circumferential angle adjusting device of the cylindrical lens described above, the lens holding cylinder and the adjusting ring are engaged with each other in the direction along the optical axis, and the adjusting ring Engagement means that allows the optical axis to rotate in the circumferential direction, the outer peripheral surface of the outer cylinder and the inner peripheral surface of the adjustment ring, and the adjustment ring as the optical axis by the rotation of the optical axis in the circumferential direction. It has a threaded portion to be moved along the lens, and the engaging means is formed on the outer periphery of the lens holding cylinder with a protruding portion protruding toward the adjusting ring and on the inner peripheral surface of the adjusting ring along the circumferential direction of the optical axis. The outer peripheral cylinder has a protruding portion insertion hole through which the protruding portion is inserted, and the protruding portion and the protruding portion inserted through the protruding portion insertion hole are formed in the outer peripheral cylinder. There is a space between the hole and the optical axis in the circumferential direction and in the direction parallel to the optical axis.

Further, in addition to the above invention, in the above-mentioned generatrix circumferential angle adjusting device for the cylindrical lens, the cam member engaging portion is formed in the protrusion insertion hole.

In order to solve the above problems, the lens barrel is provided with the above-mentioned generatrix circumferential angle adjusting device for the cylindrical lens.

Further, in addition to the above invention, in the above-mentioned lens barrel, the lens barrel circumferential angle adjusting device for the cylindrical lens is a cylindrical lens arranged behind the front group among a plurality of lenses provided in the lens barrel. It will be prepared for it.

It is a perspective view of the appearance of the lens barrel for photography to which the generatrix circumferential angle adjustment device of the cylindrical lens which concerns on embodiment of this invention is attached. It is an exploded perspective view of the adjustment device. It is a figure which shows the structure of the cross section in the surface including the optical axis of the adjustment device. It is an enlarged view which shows the part where the cam member and the cam follower of the adjustment device are attached.

FIG. 1 shows, as an example of a lens barrel, a cylindrical lens bus circumferential angle adjusting device (hereinafter, simply referred to as “adjusting device”) 1 (see FIG. 2) according to the embodiment of the present invention. It is a perspective view of the appearance of the lens barrel 200 for photography. The lens barrel 200 for photographing is provided with two or more cylindrical lenses. 2 and 3 are diagrams showing the configuration of the adjusting device 1. FIG. 2 is an exploded perspective view of the adjusting device 1. FIG. 3 is a diagram showing a cross-sectional configuration of the adjustment device 1 on the surface including the optical axis X. In the following description, the arrow X1 direction and the arrow X2 direction shown in each drawing will be described as forward and backward. In the photographing lens barrel 200 and the adjusting device 1, the photographing light travels from the direction of arrow X1 to the direction of arrow X2.

(Adjusting device 1)
The adjusting device 1 has a lens holding cylinder 2, an outer peripheral cylinder 3, a cam member 4, an adjusting ring 5, and an elongated hole 6. The cylindrical lens 7 is held in the lens holding cylinder 2. The cylindrical lens 7 is a lens to be adjusted by the adjusting device 1. That is, the adjusting device 1 adjusts the angle (hereinafter, referred to as “circumferential angle” in the unit) of the optical axis X with respect to the optical axis X of the bus of the cylindrical lens 7 in the circumferential direction (hereinafter, this adjustment is referred to as “circumferential direction”). It can be described as "angle adjustment"). Further, the adjusting device 1 can perform position adjustment (hereinafter, this adjustment is referred to as "thrust position adjustment") of the cylindrical lens 7 in the thrust direction (direction parallel to the optical axis X, that is, the front-rear direction).

In FIGS. 2 and 3, the cylindrical lens 201 arranged behind the adjusting device 1 is held by the lens holding cylinder 202. By including the adjusting device 1, the photographing lens barrel 200 can adjust the circumferential angle of the cylindrical lens 7 and adjust the thrust position with respect to the cylindrical lens 201. Therefore, the generatrix of the cylindrical lens 7 can be made to match the generatrix of the cylindrical lens 201 by adjusting the circumferential angle. Further, by adjusting the thrust position, the lens distance between the cylindrical lens 7 and the cylindrical lens 201 can be adjusted.

(Lens holding cylinder 2, outer circumference cylinder 3)
The lens holding cylinder 2 is inserted into the inner circumference of the outer peripheral cylinder 3. That is, the lens holding cylinder 2 is arranged on the inner peripheral side of the outer peripheral cylinder 3. Rim portions 2A and 2A are formed on the front and back of the outer peripheral surface of the lens holding cylinder 2 so as to project outward over the entire circumference and abut on the inner peripheral surface 3A (see FIG. 3) of the outer peripheral cylinder 3. That is, the lens holding cylinder 2 is supported by the rim portions 2A and 2A with respect to the outer peripheral cylinder 3 over the entire circumference of the optical axis X in the circumferential direction. The diameter 2L of the rim portions 2A and 2A of the lens holding cylinder 2 and the diameter 3L of the inner circumference of the outer peripheral cylinder 3 (see FIG. 3) are states in which the lens holding cylinder 2 is inserted into the inner circumference of the outer peripheral cylinder 3. Therefore, the lens holding cylinder 2 can move smoothly in the thrust direction without having play in the radial direction (direction orthogonal to the optical axis X) with respect to the outer peripheral cylinder 3, and also smoothly in the circumferential direction of the optical axis X. It is set so that it can rotate.

A flange portion 3B is provided on the outer periphery of the outer peripheral cylinder 3 on the front side. The flange portion 3B is an attachment portion of the adjusting device 1 to the photographing lens barrel 200. That is, the adjusting device 1 is attached to a mounting portion (not shown) on the photographing lens barrel 200 side via the flange portion 3B with a screw or the like, and is fixed to the photographing lens barrel 200.

(Cam member 4)
The cam member 4 has a large diameter portion 4A and a small diameter portion 4B. Both the large diameter portion 4A and the small diameter portion 4B have a cylindrical shape, and the side surface of the large diameter portion 4A is configured as a cam surface 4C. As shown in FIG. 4, the central shaft 4AA of the large diameter portion 4A is eccentric with respect to the central shaft 4BB of the small diameter portion 4B. FIG. 4 is an enlarged view showing a portion to which the cam member 4 of the adjusting device 1 and the cam follower 9 described later are attached.

The lens holding cylinder 2 is formed with a hole 2B into which the small diameter portion 4B can be fitted. The cam member 4 has a small diameter portion 4B fitted into a hole portion 2B and is attached to a lens holding cylinder 2 by a mounting pin 8. The mounting pin 8 penetrates the cam member 4 and is press-fitted or screwed to the lens holding cylinder 2. The central axis 8A of the mounting pin 8 coincides with the central axis 4BB (see FIG. 4) of the small diameter portion 4B, and each axis is arranged orthogonal to the optical axis X. The large diameter portion 4A can rotate eccentrically with the central shaft 4BB and the central shaft 8A as rotation axes. That is, the cam surface 4C is a cam surface eccentric with respect to an axis orthogonal to the optical axis X.

(Cam follower 9)
A cam follower 9 as a protruding portion protruding from the outer periphery of the lens holding cylinder 2 is attached to the lens holding cylinder 2. The cam followers 9 are provided at two locations with the optical axis X in between.

The cam follower 9 has a collar portion 9A, a support portion 9B that rotatably supports the collar portion 9A, and a mounting pin 9C. The lens holding cylinder 2 is formed with a hole 2C into which the support 9B can be fitted. The cam follower 9 has a support portion 9B fitted in the hole portion 2C and is attached to the lens holding cylinder 2 by a mounting pin 9C. The mounting pin 9C penetrates the collar portion 9A and the support portion 9B and is press-fitted or screwed to the lens holding cylinder 2. The collar portion 9A is rotatable around the support portion 9B in a state of being sandwiched between the flange portion 9D at the rear end of the mounting pin 9C and the step portion 9E of the support portion 9B.

(Adjustment ring 5)
The rear end of the outer peripheral cylinder 3 is inserted into the inner circumference of the adjusting ring 5. A male screw portion 3C is formed on the outer peripheral surface of the outer peripheral cylinder 3, and a female screw portion 5A is formed on the inner peripheral surface of the adjusting ring 5. The male threaded portion 3C and the female threaded portion 5A are screwed together when the outer peripheral cylinder 3 is inserted into the inner circumference of the adjusting ring 5. Therefore, when the adjusting ring 5 is rotated in the circumferential direction of the optical axis X while the male threaded portion 3C and the female threaded portion 5A are screwed together, the adjusting ring 5 has an outer peripheral cylinder according to the leads of the male threaded portion 3C and the female threaded portion 5A. It moves back and forth in the thrust direction with respect to 3.

A groove 5B is formed on the inner peripheral surface of the adjusting ring 5 as a protrusion engaging recess. The groove portion 5B is formed along the entire circumference of the inner peripheral surface of the adjusting ring 5 along a plane orthogonal to the optical axis X. The width 5W in the front-rear direction of the groove portion 5B allows the collar portion 9A of the cam follower 9 to fit without backlash in the front-rear direction, and the groove portion 5B can be smoothly moved in the circumferential direction of the optical axis X with respect to the collar portion 9A. Is set to. That is, the cam follower 9 and the groove 5B are engaged with each other in the thrust direction, and the groove 5B can move in the circumferential direction of the optical axis X with respect to the cam follower 9. A hole 5C is formed in the adjusting ring 5. The hole portion 5C is a hole portion that penetrates the groove portion 5B into the inner peripheral side and the outer peripheral side of the adjusting ring 5. The holes 5C are provided at two locations sandwiching the optical axis X.

(Long hole 6)
The outer peripheral cylinder 3 is formed with a long hole 6 as a protrusion insertion hole that is long in the front-rear direction in parallel with the optical axis X. The elongated holes 6 are provided at two locations sandwiching the optical axis X. With the lens holding cylinder 2 inserted on the inner peripheral side of the outer peripheral cylinder 3, the cam member 4 holds the lens through one of the long holes 6 provided at two locations sandwiching the optical axis X. It is attached to the cylinder 2. Further, the outer peripheral cylinder 3 in which the lens holding cylinder 2 is inserted is inserted into the inner peripheral side of the adjusting ring 5, and the male screw portion 3C and the female screw portion 5A are screwed together. Then, the rotational position of the adjustment ring 5 in the circumferential direction of the optical axis X is adjusted so that the hole 5C overlaps the elongated hole 6, and the hole 5C and the length of the adjusting ring 5 are overlapped with the elongated hole 6. The cam follower 9 is attached to the lens holding cylinder 2 through the hole 6.

As shown in FIG. 4, the diameter 4L of the large diameter portion 4A of the cam member 4 and the width 6W of the optical axis X of the elongated hole 6 in the circumferential direction are the same as the cam surface 4C and the inner peripheral surface 6A of the elongated hole 6. It is set so that the cam member 4 can move in the thrust direction with respect to the outer peripheral cylinder 3 without having a backlash in the circumferential direction of the optical axis X between them. The inner peripheral surface 6A of the elongated hole 6 engages with the cam surface 4C of the large diameter portion 4A in the circumferential direction of the optical axis X. That is, of the two elongated holes 6, the elongated hole 6 on the side through which the cam member 4 is passed functions as a cam member engaging portion.

The diameter 9L of the collar portion 9A of the cam follower 9 is set smaller than the width 6W of the elongated hole 6. Therefore, a gap is formed between the collar portion 9A and the inner peripheral surface 6A of the elongated hole 6. Specifically, the difference between the diameter 9L and the width 6W is set to be more than twice the eccentricity of the cam member 4.

(Adjustment operation of adjustment device 1)
The operation of the circumferential angle adjustment and the thrust position adjustment of the cylindrical lens 7 by the adjusting device 1 configured as described above will be described. The circumferential angle adjustment is performed by using the cam member 4. The cam surface 4C of the large diameter portion 4A is eccentric with respect to the central axis 8A. Further, the elongated hole 6 and the large diameter portion 4A are in contact with each other in the circumferential direction of the optical axis X. Therefore, when the large diameter portion 4A of the cam member 4 is rotated around the central axis 8A, the lens holding cylinder 2 rotates in the circumferential direction of the optical axis X according to the amount of rotation. When the lens holding cylinder 2 rotates in the circumferential direction of the optical axis X, the cylindrical lens 7 held in the lens holding cylinder 2 also rotates. That is, by rotating the large diameter portion 4A of the cam member 4 around the central axis 8A, the circumferential angle of the generatrix of the cylindrical lens 7 can be adjusted.

When the lens holding cylinder 2 rotates in the circumferential direction of the optical axis X, the cam follower 9 attached to the lens holding cylinder 2 also rotates. The diameter 9L of the collar portion 9A of the cam follower 9 is set to be smaller than the width 6W of the elongated hole 6, and there is a gap between the collar portion 9A and the elongated hole 6 in the circumferential direction of the optical axis X. Therefore, when the lens holding cylinder 2 rotates in the circumferential direction of the optical axis X, the cam follower 9 is allowed to move in the circumferential direction of the optical axis X.

A groove 4D into which a flat-blade screwdriver can be fitted is formed on the end surface of the large diameter portion 4A. By fitting a flat-blade screwdriver into the groove 4D from the outside of the elongated hole 6, the large diameter portion 4A can be easily rotated.

When the adjusting ring 5 is rotated in the circumferential direction of the outer peripheral cylinder 3, the adjusting ring 5 moves back and forth with respect to the outer peripheral cylinder 3 by the action of the female screw portion 5A and the male screw portion 3C. The groove 5B and the cam follower 9 are engaged with each other in the front-rear direction. As a result, the adjustment ring 5 moves back and forth, so that the cam follower 9 moves back and forth, which causes the lens holding cylinder 2 to move back and forth. That is, by rotating the adjusting ring 5 and moving it back and forth with respect to the outer peripheral cylinder 3, the cylindrical lens 7 held by the lens holding cylinder 2 is moved back and forth, and the distance between the lenses and the cylindrical lens 201 is adjusted. be able to.

When the lens holding cylinder 2 moves in the thrust direction, the cam member 4 and the cam follower 9 attached to the lens holding cylinder 2 also move together. The length of the elongated hole 6 in the front-rear direction is set to be longer than the length in the front-rear direction in which the cam member 4 and the cam follower 9 are arranged. Therefore, when the lens holding cylinder 2 moves in the front-rear direction, the cam member 4 and the cam follower 9 are allowed to move in the front-rear direction.

After the circumferential angle adjustment and the thrust position adjustment of the cylindrical lens 7 are completed, the cam member 4 can be stopped from rotating by filling an adhesive between the cam member 4 and the elongated hole 6. Further, by screwing the fixing screw 10 from the adjusting ring 5 toward the outer peripheral cylinder 3, the adjusting ring 5 can be stopped from rotating with respect to the outer peripheral cylinder 3.

(Main effects of embodiments of the present invention)
The adjusting device 1 is provided on the outer peripheral side of the lens holding cylinder 2, the lens holding cylinder 2 for holding the cylindrical lens 7, the outer peripheral cylinder 3 for arranging the lens holding cylinder 2 on the inner peripheral side, and the lens holding cylinder 2 on the outer peripheral side. A cam member 4 having a cam surface 4C eccentric with respect to a central axis 8A (central axis 4BB) which is an axis intersecting the optical axis X, and an outer peripheral cylinder 3 formed in the circumferential direction of the cam member 4 and the optical axis X. It has an elongated hole 6 as a cam member engaging portion to be engaged with. Then, rim portions 2A, 2A are formed on the front and back of the outer peripheral surface of the lens holding cylinder 2 so as to project outward over the entire circumference and abut on the inner peripheral surface 3A of the outer peripheral cylinder 3, and the rim portions 2A, The lens holding cylinder 2 is supported by the outer peripheral cylinder 3 via the 2A over the entire circumference of the optical axis X in the circumferential direction.

In the adjusting device 1 having the above configuration, the lens holding cylinder 2 is supported in the outer peripheral cylinder 3 over the entire circumference. Therefore, the lens holding cylinder 2 can rotate about the optical axis X in the outer peripheral cylinder 3. The adjusting device 1 has a cam member 4 provided in the lens holding cylinder 2 and an elongated hole 6 formed in the outer peripheral cylinder 3 and capable of engaging with the cam member 4. The cam member 4 is rotatable around the central axis 8A (central axis 4BB), which is an axis intersecting the optical axis X, and the lens holding cylinder 2 is rotatable about the optical axis X. Therefore, by rotating the cam member 4, the lens holding cylinder 2 can be rotated in the circumferential direction of the optical axis X, and the circumferential angle of the generatrix of the cylindrical lens 7 held in the lens holding cylinder 2 can be adjusted. can do.

In the above-mentioned adjusting device 1, the lens holding cylinder 2 is supported by the outer peripheral cylinder 3 over the entire circumference of the optical axis X in the circumferential direction. However, the lens holding cylinder 2 may be supported in at least three directions at equal intervals in the circumferential direction of the optical axis X. The lens holding cylinder 2 can rotate about the optical axis X by being supported in three directions at equal intervals in the circumferential direction of the optical axis X. For example, the rim portions 2A and 2A may be divided into three at equal intervals in the circumferential direction of the optical axis X without being provided on the entire circumference of the lens holding cylinder 2.

The above-mentioned adjusting device 1 has an adjusting ring 5 for arranging the outer peripheral cylinder 3 on the inner peripheral side, and the outer peripheral cylinder 3 and the adjusting ring 5 have a male screw portion 3C and a female screw portion 5A which are screwed to each other as screw portions. .. The lens holding cylinder 2 has a cam follower 9 as a protruding portion, the adjusting ring 5 has a groove portion 5B as a protruding portion engaging recess, and the cam follower 9 is inserted through the outer peripheral cylinder 3. An elongated hole 6 is formed as a protrusion insertion hole. A gap is formed between the cam follower 9 and the elongated hole 6 in the circumferential direction and the thrust direction of the optical axis X.

By providing the above-mentioned configuration, the adjusting device 1 can move the adjusting ring 5 back and forth in the thrust direction by rotating the adjusting ring 5 in the circumferential direction of the optical axis X. By moving the adjusting ring 5 in the thrust direction, the lens holding cylinder 2 can be moved in the thrust direction via the groove portion 5B and the cam follower 9, whereby the thrust position of the cylindrical lens 7 can be adjusted.

In the adjusting device 1, the lens holding cylinder 2 and the adjusting ring 5 are engaged with each other in the direction along the optical axis X, and as an engaging means that allows the optical axis X of the adjusting ring 5 to rotate in the circumferential direction. A cam follower 9 and a groove 5B are provided. Further, as a lens holding cylinder moving mechanism for moving the lens holding cylinder 2 in the thrust direction by rotating the optical axis X of the adjusting ring 5 in the circumferential direction, an engaging means including a cam follower 9 and a groove 5B and a male screw portion 3C And a female screw portion 5A are provided. However, the lens holding cylinder moving mechanism is not limited to the above configuration, and for example, the groove portion 5B may be configured as a cam groove having a cam angle inclined in the front-rear direction. In this configuration, the lens holding cylinder 2 is simply rotated in the circumferential direction of the optical axis X without moving the adjusting ring 5 back and forth due to the action of the male screw portion 3C and the female screw portion 5A. Can be moved back and forth. Further, the protruding portion that engages with the groove portion 5B is not limited to the cam follower 9, and may engage with the groove portion 5B so that the optical axis X of the adjusting ring 5 can rotate in the circumferential direction. Therefore, the protrusion that engages with the groove 5B may be, for example, a cylindrical protrusion instead of the cam follower 9. However, when the cam follower 9 is used, the collar portion 9A rotates, so that the adjustment ring 5 can be smoothly rotated.

In the adjusting device 1, the elongated hole 6 as the protrusion insertion hole also serves as the cam member engaging portion, but the cam member engaging hole into which the cam member 4 is inserted and the cam follower 9 It may be configured to separately provide a hole for inserting a protruding portion through which the is inserted. However, the configuration of the outer peripheral cylinder 3 can be simplified by combining the hole for inserting the protruding portion with the hole for engaging the cam member.

The photographing lens barrel 200 is provided with a plurality of cylindrical lenses, and an adjusting device 1 is provided for at least one cylindrical lens. By using the adjusting device 1, it is possible to adjust the circumferential angle and thrust position of the generatrix of the cylindrical lens provided with the adjusting device 1, and adjust the circumferential angle of the bus between the cylindrical lenses and the distance between the lenses. can do.

The cylindrical lens to be adjusted by the adjusting device 1 can be used as the front lens of the lens barrel 200 for photographing, that is, as the frontmost lens with respect to the subject, but it is preferably arranged behind the front lens. .. By arranging it behind the front lens, it is possible to reduce the size of the cylindrical lens. Similarly, when the adjusting device 1 is used for projecting an image or a projection (projection) lens barrel for projection, it is more likely than a cylindrical lens to be investigated at the front position with respect to the projection (projection) surface. It is preferable to arrange the lens at the rear from the viewpoint of miniaturization of the cylindrical lens and the viewpoint that the cylindrical lens can be responsible for aberration correction.

The above-mentioned adjusting device 1 shows an example in which the circumferential angle of the cylindrical lens 7 and the thrust position are adjusted with respect to the cylindrical lens 201. However, when a plurality of cylindrical lenses to be adjusted are provided, the adjusting device 1 is to be adjusted. It is preferable that each lens is provided with the adjusting device 1, but it may be provided only for the cylindrical lens having a large influence on the imaging state.

1 ... Adjustment device (Cyrindrical lens bus circumference angle adjustment device)
2 ... Lens holding cylinder 3 ... Outer cylinder 3C ... Male threaded part (threaded part)
4 ... Cam member 4C ... Cam surface 5 ... Adjusting ring 5A ... Female threaded part (threaded part)
5B ... Groove (protruding engagement recess)
6 ... Long hole (cam member engaging part, protruding part insertion hole)
7 ... Cylindrical lens 8A ... Axis 9 ... Cam follower (protruding part.)
X ... Optical axis 200 ... Lens barrel for photography (lens barrel)

Claims (5)

A lens holding cylinder that holds the cylindrical lens,
An outer peripheral cylinder that arranges the lens holding cylinder on the inner peripheral side, and
A cam member provided on the outer peripheral side of the lens holding cylinder and having a cam surface eccentric with respect to an axis intersecting the optical axis of the lens holding cylinder.
A cam member engaging portion formed on the outer peripheral cylinder and engaging with the cam member in the circumferential direction of the optical axis.
An adjustment ring that arranges the outer peripheral cylinder on the inner peripheral side,
A lens holding cylinder moving mechanism that moves the lens holding cylinder along the optical axis by rotating the adjusting ring in the circumferential direction of the optical axis.
Have,
The lens holding cylinder is supported by the outer peripheral cylinder in at least three directions at equal intervals in the circumferential direction of the optical axis.
The lens holding cylinder moving mechanism is
An engaging means in which the lens holding cylinder and the adjusting ring are allowed to engage with each other in a direction along the optical axis and the adjusting ring is allowed to rotate in the circumferential direction of the optical axis.
A screw portion that moves the adjusting ring along the optical axis by rotating the adjusting ring in the circumferential direction on the outer peripheral surface of the outer peripheral cylinder and the inner peripheral surface of the adjusting ring.
Have,
The engaging means is
A protruding portion protruding toward the adjusting ring on the outer circumference of the lens holding cylinder,
A protruding portion engaging recess formed on the inner peripheral surface of the adjusting ring along the circumferential direction of the optical axis and engaging with the protruding portion,
Have,
The outer peripheral cylinder is formed with a protrusion insertion hole through which the protrusion is inserted.
There is a gap between the protruding portion inserted into the protruding portion insertion hole and the protruding portion insertion hole in the circumferential direction of the optical axis and in the direction parallel to the optical axis.
The difference between the diameter of the protruding portion and the width of the protruding portion insertion hole is provided to be at least twice the amount of eccentricity of the cam surface in the cam member.
A device for adjusting the angle of the generatrix of a cylindrical lens, which is characterized by this. In the generatrix circumferential angle adjusting device for a cylindrical lens according to claim 1.
The adjusting ring is formed with a hole that penetrates the protrusion engaging recess on the outer peripheral side and the inner peripheral side, and the protruding portion enters the hole without interfering with the adjusting ring .
A device for adjusting the angle of the generatrix of a cylindrical lens, which is characterized by this. In the generatrix circumferential angle adjusting device for a cylindrical lens according to claim 1 or 2.
The cam member engaging portion is formed in the protruding portion insertion hole.
A device for adjusting the angle of the generatrix of a cylindrical lens, which is characterized by this. A lens barrel comprising the generatrix circumferential angle adjusting device for a cylindrical lens according to any one of claims 1 to 3. In the lens barrel according to claim 4,
The lens barrel, wherein the generatrix circumferential angle adjusting device for the cylindrical lens is provided for a cylindrical lens arranged on the rear side of the front group among a plurality of lenses provided on the lens barrel.

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