JP2021051181A - Lens barrel and method of aligning the same - Google Patents

Abstract

To provide a lens barrel that offers good optical performance and a method of aligning the same.SOLUTION: A lens barrel (2) of the present invention comprises a lens holding frame (402, etc.) holding a lens (L4), a first frame (401, etc) different from the lens holding frame (402, etc.), and a drive unit (403, 404, 405, etc.) provided either in the first frame (401, etc.) or the lens holding frame (402, etc.) and configured to change inclination of the lens holding frame (402, etc.) with respect to the first frame (401, etc.).SELECTED DRAWING: Figure 15

Description

The present invention relates to a lens barrel and a method for aligning the lens barrel.

Alignment is performed using a specific lens in the lens barrel (see, for example, patent literature). Such alignment is performed when assembling the lens barrel.

Utility Model No. 2575116

The lens barrel of the first aspect is provided in either the lens holding frame for holding the lens, the first frame different from the lens holding frame, the first frame or the lens holding frame, and the first. A drive unit for changing the inclination of the lens holding frame with respect to the frame is provided.

The lens barrel of the second aspect is provided in either the lens holding frame for holding the lens, the first frame different from the lens holding frame, the first frame or the lens holding frame, and holds the lens. The configuration includes a drive unit that drives a part of the frame in a direction away from the first frame.

It is a schematic sectional view at the wide-angle end of the interchangeable lens barrel which can be attached and detached to a camera body. It is a schematic cross-sectional view which looked at the lens barrel at a wide-angle end from the angle different from FIG. It is a schematic cross-sectional view at the telephoto end of the lens barrel at the angle of FIG. It is a figure which looked at the alignment lens holding part in 1st Embodiment from the mount side in the optical axis OA direction. It is a schematic cross-sectional view of X1-X1 of the centering lens holding part shown in FIG. 4 in 1st Embodiment. It is an enlarged view of the part surrounded by the dotted line of the lens barrel in the case of the wide-angle end shown in FIG. It is an enlarged view of the part surrounded by the dotted line of the lens barrel in the case of the telephoto end shown in FIG. FIG. 5 is a perspective view of a drive unit mounting frame for mounting the drive unit and the drive unit to the facing frame in the first embodiment. It is a block diagram of the part related to the alignment control of a lens barrel. It is a flowchart which shows the operation of the control part of a lens barrel. It is a figure explaining the movement amount of the center of the centering lens when the 1st centering pin is displaced in the tangential direction of the circle about the optical axis in 1st Embodiment. In the first embodiment, (a) is a diagram for explaining the center of rotation of the centering lens, and (b) is a diagram showing the moving direction and the amount of movement of the center of the centering lens. In the second embodiment, it is a figure explaining the locus of the center of the centering lens when the centering pin is moved, (a) is a figure explaining the center of rotation of a centering lens, and (b) is a figure explaining the center of rotation of a centering lens. It is a figure which shows the moving direction and the moving amount of the center of a lens. In the third embodiment, (a) is a diagram for explaining the center of rotation of the centering lens, and (b) is a diagram showing the moving direction and the amount of movement of the center of the centering lens. It is the schematic sectional drawing of the centering lens holding part of 4th Embodiment. FIG. 15 is a cross-sectional view taken along the line X2-X2 of FIG. 15 of the fourth embodiment. It is the schematic sectional drawing of the centering lens holding part of 5th Embodiment. 5 is a cross-sectional view taken along the line X3-X3 of FIG. 17 of the fifth embodiment. It is the schematic sectional drawing of the centering lens holding part of 6th Embodiment. 6 is a cross-sectional view taken along the line X4-X4 of FIG. 19 of the sixth embodiment. It is the schematic sectional drawing of the centering lens holding part of 7th Embodiment. FIG. 21 is a cross-sectional view taken along the line DD of FIG. 21 according to the seventh embodiment. It is an enlarged sectional view of the shift adjustment nut of 7th Embodiment. FIG. 22 (c) is a partially enlarged cross-sectional view of FIG. 22 (c) of the seventh embodiment. FIG. 5 is a partially enlarged cross-sectional view of an engaging portion between the lead screw and the shift adjusting nut according to the seventh embodiment. It is a figure which shows the shape of the shift adjustment nut of 8th Embodiment, (a) is a top view, (b) is a sectional view. FIG. 5 is a partially enlarged cross-sectional view in which a shift adjusting nut is screwed into the lead screw of the drive unit of the eighth embodiment. It is the schematic sectional drawing of the centering lens holding part of 9th Embodiment. 9 is a cross-sectional view taken along the line EE of FIG. 28 of the ninth embodiment. It is an enlarged sectional view of the shift adjustment nut of 9th Embodiment. 9 is an enlarged cross-sectional view of FIG. 29 (c) of the ninth embodiment. It is the schematic sectional drawing of the centering lens holding part of the tenth embodiment. FIG. 3 is a sectional view taken along the line FF of FIG. 32 of the tenth embodiment. This is a modified example of the tenth embodiment, and is an example in which a spherical portion is provided on the rear end surface of the centering lens moving cylinder. It is the schematic sectional drawing of the centering lens holding part of 11th Embodiment. FIG. 5 is a cross-sectional view taken along the line GG of FIG. 35 of the eleventh embodiment. This is a modified example of the eleventh embodiment. It is the schematic sectional drawing of the centering lens holding part of the twelfth embodiment. FIG. 8 is a sectional view taken along the line HH of FIG. 38 of the twelfth embodiment. It is a front view of the annular leaf spring of the twelfth embodiment.

Hereinafter, the lens barrel 2 of the embodiment will be described with reference to the drawings and the like. FIG. 1 is a schematic cross-sectional view of the interchangeable lens barrel 2 that can be attached to and detached from the camera body 1 at the wide-angle end. FIG. 2 is a schematic cross-sectional view of the lens barrel 2 at the wide-angle end as viewed from an angle different from that of FIG. FIG. 3 is a schematic cross-sectional view of the lens barrel 2 at the telephoto end at the angle of FIG.

The lens barrel 2 is a so-called zoom lens in which the focal length can be variably adjusted by changing the relative position of the photographing optical system (lenses L1 to L4). The lens barrel 2 includes a photographing optical system having a 4-group lens configuration having a 1-group lens L1, a 2-group lens L2, a 3-group lens L3, and a 4-group lens (alignment lens L4) from the subject side in the optical axis OA direction. .. The 1st group lens L1 is a focus lens, and the 2nd group lens L2 is a blur correction lens. The lens configuration is not limited to the above, and for example, the centering lens may be another lens (L1 to L3). Further, there may be a plurality of alignment lenses.

The centering lens L4 is a lens that prevents the occurrence of image plane asymmetry (one-sided blur) and aberration by adjusting the position in the shift direction or the tilt direction with respect to the optical axis OA. One-sided blur is a phenomenon in which when the image plane is tilted with respect to a plane orthogonal to (intersecting) the optical axis, one is in focus at the top, bottom, left, and right of the screen, and the other is blurred. One-sided blur is also called image plane asymmetry or asymmetry.

Further, the lens barrel 2 includes a fixed cylinder 3, a cam cylinder 5, a straight-ahead group 9, and an electromagnetically driven diaphragm 110. The fixed cylinder 3 is arranged on the body side of the lens barrel 2 in the optical axis OA direction. At the end of the fixed cylinder 3 on the camera body 1 side, a lens-side mount portion 4 that is coupled to the camera-side mount portion is provided. When the lens barrel 2 is attached to the camera body 1 by combining the camera-side mount portion and the lens-side mount portion 4, the fixed cylinder 3 is attached to the camera body 1. Further, the fixing cylinder 3 includes an outer fixing cylinder 31 and an inner fixing cylinder 32 arranged inside the inner diameter of the outer fixing cylinder 31.

The cam cylinder 5 is arranged on the inner diameter side of the outer fixed cylinder 31 and extends toward the subject in the optical axis OA direction. A zoom ring 6 is attached to the outer diameter side of the cam cylinder 5, and the cam cylinder 5 can be rotated with respect to the fixed cylinder 3 by rotating the zoom ring 6. The inner surface of the cam cylinder 5 is provided with three group 1 cam grooves 51, three group cam grooves 53, and three group 4 cam grooves 54, respectively.

A straight group 9 is arranged between the cam cylinder 5 and the inner fixed cylinder 32. The straight group 9 includes a group 1 moving cylinder (first straight cylinder) 11, a focus ring (rotary cylinder) 12, and a focus moving cylinder (second straight cylinder) 13.

The group 1 moving cylinder 11 is arranged on the innermost inner diameter side of the straight group 9. A straight groove 112 is provided on the outer circumference of the tip on the subject side. The group 1 moving cylinder 11 is also engaged with a straight groove (not shown) provided in the inner fixed cylinder 32.

The focus ring 12 is arranged on the outer diameter side of the 1st group moving cylinder 11, is rotatable with respect to the 1st group moving cylinder 11, and travels straight together with the 1st group moving cylinder 11. That is, the focus ring 12 does not move relative to the group 1 moving cylinder 11 in the optical axis OA direction, but rotates. A helicoid groove 121 is provided on the inner surface of the focus ring 12.

The focus moving cylinder 13 is arranged between the group 1 moving cylinder 11 and the focus ring 12, and a helicoid screw 131 is provided on the outer surface. Further, on the inner diameter side, a protrusion 132 that moves straight along the straight groove 112 of the group 1 moving cylinder 11 is provided.
By rotating the focus ring 12, the helicoid screw 131 moves along the helicoid groove 121, and the focus moving cylinder 13 advances straight with respect to the focus ring 12 and the group 1 moving cylinder 11.

The lens barrel 2 is provided with a focus encoder 17. The focus encoder 17 includes an FPC (flexible printed circuit board) 14 and a brush 15.
The FPC 14 is attached to the outer diameter side of the group 1 moving cylinder 11, and an encoder pattern (not shown) is formed. The FPC 14 is connected to a control unit 120a provided on the lens substrate 120 attached to the inner fixing cylinder 32 (connection path is not shown).

The brush 15 is attached to the focus ring 12. When the focus ring 12 rotates with respect to the group 1 moving cylinder 11, the brush 15 moves on the FPC 14. The FPC 14 generates an electrical signal corresponding to the position on the encoder pattern of the brush 15 and transmits it to the control unit 120a, and the control unit 120a detects the amount of rotation of the focus ring 12. Then, the control unit 120a obtains the amount of the focus moving cylinder 13 moving straight based on the amount of rotation of the focus ring 12. Thereby, the position of the 1st group lens L1 can be detected.

A third cam follower 83 attached to the third group lens holding portion 73 that holds the third group lens L3 is engaged with the third group cam groove 53.
The third cam follower 83 also engages with the straight groove 33 provided in the inner fixed cylinder 32, and the third group lens L3 moves straight along the optical axis OA by the rotation of the cam cylinder 5.
The second group lens L2 is held by the second group lens holding portion 72. The second group lens holding portion 72 is attached to the centering lens holding portion 74. Therefore, the second group lens L2 and the centering lens L4 move in a straight line as one.

An electromagnetically driven diaphragm 110 is provided on the subject side of the third group lens holding portion 73 in the optical axis OA direction. An FPC 111 for supplying a drive signal and drive power to the electromagnetic drive diaphragm 110 from the lens substrate 120 attached to the fixed cylinder 3 (32) is connected to the third group lens holding portion 73 (see FIGS. 2 and 3). ).

The fourth cam follower 84 attached to the alignment lens holding portion 74 that holds the alignment lens L4 engages with the fourth group cam groove 54 (see FIG. 1). The centering lens holding portion 74 will be described later.
The fourth cam follower 84 also engages with the straight groove 33 provided in the inner fixed cylinder 32, and the second group lens L2 and the centering lens L4 move straight along the optical axis OA by the rotation of the cam cylinder 5. ..

When the photographer rotates the zoom ring 6 (cam cylinder 5), the cam followers 83 and 84 move along the third group cam groove 53 and the fourth group cam groove 54 provided on the inner surface of the cam cylinder 5.
At this time, since the cam followers 83 and 84 slide along the straight groove 33, the second group lens L2 and the third group lens L3 and the centering lens L4 of the photographing optical system move in the optical axis OA direction.
Further, the cam follower 82 also moves along the cam groove 51 of the first group, and the straight group 9 also moves along the optical axis OA.

Then, the focal length of the entire photographing optical system continuously changes (zooming). The positional relationship of the photographing optical system (lenses L1 to L4) changes between the telephoto end shown in FIG. 1 or 2 and the wide-angle end shown in FIG.

The zoom encoder 90 (shown in FIG. 9 described later) is arranged between the cam cylinder 5 and the fixed cylinder 3, for example, and the rotation of the zoom ring 6 with respect to the fixed cylinder 3, that is, the amount of rotation of the cam cylinder 5 with respect to the fixed cylinder 3. Is detected.

When the photographer turns the zoom ring 6, the control unit 120a obtains the current focal length of the lens barrel 2 based on the amount of rotation of the zoom ring 6 detected by the zoom encoder 90.

(First Embodiment)
(Alignment lens holding unit 74)
Next, the lens barrel 2 of the first embodiment will be described. The lens barrel 2 of the second and third embodiments described from the first embodiment is a form in which the alignment lens L4 is mainly shifted driven.
FIG. 4 is a view of the centering lens holding portion 74 according to the first embodiment as viewed from the mount side in the optical axis OA direction. FIG. 5 is a schematic cross-sectional view of the centering lens holding portion 74 in the first embodiment, the upper part is a schematic cross-sectional view along a straight line X1A extending from the optical axis OA shown in FIG. 4 in the direction of the centering pin 161b, and the lower part is a schematic cross-sectional view. It is a schematic cross-sectional view along the straight line X1B extending in the direction of the ball 163 in the lower left from the optical axis OA shown in FIG.

The centering lens holding portion 74 includes a centering lens moving cylinder 101 and a centering lens holding frame 102. The centering lens holding frame 102 holds a centering lens L4 that can be moved in a direction intersecting the optical axis OA direction (for example, a vertical direction). Further, the centering lens moving cylinder 101 and the centering lens holding frame 102 are arranged so as to face each other, and move integrally in the optical axis OA direction.

(Alignment lens holding frame 102)
The centering lens holding frame 102 is an annular member having a constant width in the radial direction that holds the outer circumference of the centering lens L4.

(Engage slot 115)
The centering lens holding frame 102 is provided with three engaging elongated holes 115 (first engaging elongated hole 115a, second engaging elongated hole 115b, and third engaging elongated hole 115c). The sizes of the three engaging slot 115s are substantially the same as each other. The major axis of the first engaging slot 115a extends along a straight line m1 extending in the radial direction from the center O of the centering lens L4. In other words, the major axis of the first engaging slot 115a extends in a direction orthogonal to (intersecting) the moving direction of the first alignment pin 161a, which will be described later. The major axis of the second engaging slot 115b extends along a straight line m2 extending in the radial direction from the center O of the centering lens L4. In other words, the major axis of the second engaging slot 115b extends in a direction orthogonal to (intersects) the moving direction of the second alignment pin 161b, which will be described later. The major axis of the third engaging slot 115c extends along a straight line m3 extending in the radial direction from the center O of the centering lens L4.

The angle between the straight line m1 and the straight line m2 is approximately 90 degrees. The straight line m3 divides the obtuse angle between the straight lines m1 and m2 into approximately two equal parts, and extends in a direction of approximately 135 degrees with respect to each. It should be noted that the above-mentioned angles do not necessarily have to be perfect, and may be deviated by several degrees. The radial distances of the three engaging elongated holes 115 (first engaging elongated hole 115a, second engaging elongated hole 115b, third engaging elongated hole 115c) from the center O of the centering lens L4 are substantially equal. They are arranged on the same circumference.
The diameter of the centering pin 161 described later is shorter than the major axis of the engaging slot 115 and is substantially the same as the minor axis.

(Alignment lens moving cylinder 101)
The centering lens moving cylinder 101 is a cylindrical member having an opening in the center, and is provided on the centering lens holding frame 102 side (mount side in the optical axis OA direction) and the facing frame 101a, and from the facing frame 101a to the subject side in the optical axis OA direction. It is provided with a cam follower connecting cylinder 101b that extends to and is connected to the second group lens holding portion 72 as shown in FIG.

(Coil spring 108)
Between the facing frame 101a and the centering lens holding frame 102, a coil spring 108 that urges the facing frame 101a and the centering lens holding frame 102 in a direction approaching each other has a predetermined diameter centered on the optical axis OA. It is installed in three places that are almost even along the circumference.

(Washer 162, ball 163)
On the surface of the facing frame 101a on the side of the centering lens holding frame 102, recesses 164 are provided at three locations that are substantially equal along the circumference of a predetermined diameter centered on the optical axis OA. A washer 162 is arranged in each recess 164, a ball 163 is arranged on the centering lens holding frame 102 side of the washer 162, and the ball 163 is in contact with the centering lens holding frame 102.

According to the present embodiment, the facing frame 101a and the centering lens holding frame 102 are formed by adjusting the number of washers 162 in the recesses 164 provided at three locations that are substantially equal in the circumferential direction of the optical axis OA. It is possible to finely adjust the distance between them in the optical axis OA direction. By adjusting the position of the centering lens L4 in the optical axis OA direction in this way, aberrations (for example, spherical aberration, curvature of field, etc.) can be adjusted.

By making the number of washers 162 in the recesses 164 at the three locations different, the tilt of the centering lens L4 can also be corrected.

Further, the facing frame 101a and the centering lens holding frame 102 sandwich the ball 163 and are urged by the coil spring 108 in a direction approaching each other. Therefore, the facing frame 101a and the centering lens holding frame 102 can move relatively and smoothly with respect to each other in the direction orthogonal to (intersecting) with respect to the optical axis OA.

(Movement restriction pin 165)
The centering lens holding frame 102 and the facing frame 101a are provided with two movement limiting pins 165 that penetrate each other and hold the lens so as not to open more than a certain distance.
The centering lens holding frame 102 and the facing frame 101a are urged in a direction approaching each other by the coil spring 108 under normal conditions, and the distance between them is defined by the washer 162 and the ball 163.
Therefore, the movement limiting pin 165 does not constrain the distance between the centering lens holding frame 102 and the facing frame 101a in a normal state.
However, it is conceivable that an impact is applied due to, for example, dropping, and an inertial force is applied to the centering lens holding frame 102 with respect to the facing frame 101a against the force of the coil spring 108 in a direction in which the distance increases. In this case, the movement limiting pin 165 prevents the distance between the centering lens holding frame 102 and the facing frame 101a from being separated by a predetermined distance or more.

(Position detector 150)
Hall elements 107 are attached to two positions on the side of the centering lens holding frame 102 of the facing frame 101a. On the other hand, the magnet 109 is attached to the centering lens holding frame 102 on the facing frame 101a side at a position facing the Hall element 107. The Hall element 107 and the magnet 109 form a position detection unit 150.
In the present embodiment, the angle between the lines extending from the optical axis OA (center O of the centering lens L4) to each of the two position detection units 150 is 90 degrees.

(FPC112)
As shown in FIGS. 2 and 3, the FPC 106 for supplying power to the drive unit 103 (described later) attached to the facing frame 101a and exchanging signals from the Hall element 107 as shown in FIG. 4 is provided with the facing frame 101a. It is connected to the FPC 112 on the side surface 101c of the subject in the optical axis OA direction.
The FPC 112 is attached to the third group lens holding portion 73 and is connected to the FPC 111 that sends power and a signal to the electromagnetically driven diaphragm 110. As described above, the FPC 111 is connected to the lens substrate 120 attached to the fixed cylinder 3 (32).

As a result, the lens substrate 120, the drive unit 103, and the Hall element 107 are electrically connected. That is, the drive power can be supplied from the lens substrate 120 to the drive unit 103. Further, since the signal can be transmitted from the position detection unit 150 to the lens substrate 120, the position can be detected in the direction orthogonal to the optical axis OA with respect to the centering lens holding frame 102, that is, the centering lens L4 facing frame 101a. It will be possible.

FIG. 6 is an enlarged view of a portion P surrounded by a dotted line of the lens barrel 2 in the case of the wide-angle end shown in FIG. FIG. 7 is an enlarged view of a portion P surrounded by a dotted line of the lens barrel 2 in the case of the telephoto end shown in FIG.
As shown in FIG. 7, when the focal length of the lens barrel 2 is at the telephoto end, the distance between the centering lens moving cylinder 101 and the 3rd group lens holding portion 73 is larger than that at the wide-angle end shown in FIG. It becomes narrower and the bending angle of the FPC 112 becomes smaller.
Since the bending angle of the FPC 112 only changes, the FPC 112 is less likely to get entangled, the durability is improved, and the wiring space can be reduced.

If the FPC 106 of the centering lens holding portion 74 is directly wired to the lens substrate 120, a long FPC such as the FPC 111 is required.
However, in the case of the present embodiment, the FPC 112 is extended from the centering lens holding portion 74 to the third group lens holding portion 73 having a small relative movement amount in the optical axis OA direction with respect to the centering lens holding portion 74. Then, the FPC 111 extending from the third group lens holding portion 73 to the lens substrate 120 is shared.

According to this embodiment, a long FPC that directly connects the FPC 106 to the lens substrate 120 is not required, and cost reduction and miniaturization of the lens barrel can be achieved. Further, since the lenses with less relative movement are connected, the FPC wiring is not complicated.

(Drive 103)
Returning to FIG. 4, two drive units 103 (103a, 103b) are attached to the centering lens holding frame 102 side of the facing frame 101a. The angle between the lines extending from the optical axis OA to the two drive units 103a and 103b is approximately 90 degrees.

FIG. 8 is a perspective view of the drive unit mounting frame 105 for mounting the drive unit 103a and the drive unit 103b to the facing frame 101a in the first embodiment. In the present embodiment, the drive unit 103 is a stepping motor, and a lead screw 104 that is rotated by the drive of the drive unit 103 extends from the drive unit 103. The drive unit 103, the reed screw 104, and the moving piece 160, which will be described later, may be considered as the drive unit.

(Drive unit mounting frame 105)
The drive unit mounting frame 105 has a frame base end plate 105a and a frame tip plate 105b that penetrate and hold the base end side and the tip end side of the lead screw 104, and a frame side end plate 105c that connects them.
The frame side end plate 105c extends parallel to the lead screw 104, and a frame fixing plate 105d bent from the side surface to the side opposite to the lead screw 104 is provided. As shown in FIG. 5, the frame fixing plate 105d is fixed to the facing frame 101a with screws 105e.

(Moving frame 160)
A moving piece 160 is screwed into the lead screw 104. The moving piece 160 is a U-shaped member, and is provided with a groove screwed into the lead screw 104 inside. The lead screw 104 is sandwiched between the portions where the grooves are formed, and both ends of the U-shape extending in the lateral direction are screwed to each other.

(Alignment pin 161)
The alignment pin 161 extends from the outer surface of the moving frame 160 to the alignment lens holding frame 102 side. The alignment pins 161 (161a, 161b) of the two drive units 103 (103a, 103b) are provided in the first engagement slot 115a and the second engagement slot 115b provided in the alignment lens holding frame 102, respectively. It has been inserted.

(Fixing pin 161c)
Further, a fixing pin 161c extends toward the centering lens holding frame 102 side at a position corresponding to the third engaging slot 115c in the facing frame 101a, and is inserted into the third engaging slot 115c.

Next, the alignment control of the lens barrel 2 will be described. FIG. 9 is a block diagram of a portion related to alignment control of the lens barrel 2. FIG. 10 is a flowchart showing the operation of the control unit 120a of the lens barrel 2.

In addition to the above configuration, the lens barrel 2 further includes a zoom encoder 90 that detects the rotation of the zoom ring 6, a control unit 120a provided on the lens substrate 120, a centering amount storage unit 120b, and a centering unit. The drive unit 103, which is the stepping motor described above, and the position detection unit 150 described above, and the centering lens L4 described above are provided.

Optimal position information of the centering lens L4 (shift position information in the first embodiment) at each focal length from the wide-angle end to the telephoto end is stored in advance in the centering amount storage unit 120b at the time of manufacture. There is.

When the photographer turns the zoom ring 6, the control unit 120a obtains the current focal length of the lens barrel 2 based on the amount of rotation of the zoom ring 6 detected by the zoom encoder 90 (step S1).

The control unit 120a provides the centering position information (shift position information) of the centering lens L4 that improves the optical performance of the lens barrel 2 (reduces aberration and reduces one-sided blur) at the focal length. Read from the storage unit 120b (step S2).

The control unit 120a detects the current position of the alignment lens holding frame 102 (alignment lens L4) with respect to the facing frame 101a by the position detection unit 150.
Then, the detection position of the alignment lens holding frame 102 (alignment lens L4) detected by the position detection unit 150 is compared with the alignment position of the alignment lens L4 stored in the alignment amount storage unit 120b. (Step S3).

When the position difference between the detection position of the alignment lens L4 detected by the position detection unit 150 and the alignment position stored in the alignment amount storage unit 120b of the control unit 120a is equal to or less than the threshold value (step S4, YES). , End the alignment control of the lens barrel 2 When the position difference is larger than the threshold value (step S4, NO), the drive amount of the alignment lens L4 is calculated (step S5).

The control unit 120a drives the drive unit 103 and rotates the reed screw 104 based on the calculated drive amount (step S6). Then, the moving piece 160, that is, the centering pin 161 moves back and forth along the lead screw 104. That is, the centering pin 161 moves in the tangential direction of the circumference about the optical axis OA. By moving the centering pin 161, the engaging slot 115 portion of the centering lens holding frame 102 also moves. Further, when the moving piece 160 moves, the position where the engaging slot 115 and the moving piece 160 are engaged changes. That is, the position where the moving piece 160 is engaged with the engaging slot 115 changes.

FIG. 11 is a diagram illustrating the amount of movement of the center O of the centering lens L4 when the first centering pin 161a is driven by δa in the tangential direction of a circle centered on the optical axis OA in the first embodiment. Is.
here,
Position of 1st alignment pin 161a: A
Position of 2nd alignment pin 161b: B
Position of fixing pin 161c: C
Distance from the center O of the first alignment pin 161a, the second alignment pin 161b, and the fixing pin 161c: R
Drive amount of first alignment pin 161a: δa
Tangent line of a circle centered on O at position A (line orthogonal to the major axis of the first engaging slot 115a): n1
Tangent line of a circle centered on O at position B (line orthogonal to the major axis of the second engaging slot 115b): n2
-Tangent line of a circle centered on O at position C (line orthogonal to the major axis of the third engaging slot 115c): n0
Intersection of tangent n1 and tangent n2: P
And.

..
When the first alignment pin 161a at the position A is driven by δa in the tangential direction of the circle centered on the optical axis OA, the alignment lens L4 rotates around the point D shown in the drawing. The point D is the intersection of the tangent line n0 and the tangent line n2.

The rotation angle Δθ around the point D of the centering lens L4 is
Δθ = δa / DP
Is.

here,
∠BDE = 45 °
Because it is
OE = √2R
Will be.
Therefore,
BE = R + √2R = (1 + √2) R
Will be.

Since the triangle BDE is an isosceles triangle, BD = BE
BP = R
Therefore,
DP = BD + BP
= (1 + √2) R + R
= (2 + √2) R
Therefore, Δθ = δa / ((2 + √2) R) = δa / (√2 (1 + √2) R)

When the centering lens L4 makes a slight rotation around the point D, the amount of movement of the center O of the centering lens L4 in the x direction is equal to the amount of movement of the center O in the x direction. Further, the amount of movement of the center O of the centering lens L4 in the y direction is equal to the amount of movement of the Q point in the y direction. Therefore

x = BD × Δθ = (1 + √2) R × δa / (√2 (1 + √2) R)
= Δa / √2

y = DQ × Δθ = R × δa / (√2 (1 + √2) R)
= Δa / (√2 (1 + √2))
Will be.

The same applies to the drive unit 103b at the point B. Therefore, assuming that the correction amount of the alignment lens L4 is (δx, δy), the drive amounts (δa, δb) of the drive units 103a and 103b (first alignment pin 161a and second alignment pin 161b) are as follows. It can be calculated by the formula.

FIG. 12 is a diagram illustrating a locus of the center O of the centering lens L4 when the centering pin 161 is moved in the tangential direction of a circle centered on the optical axis OA in the first embodiment.
(A) is a diagram for explaining the rotation centers D1 and D2 of the center O of the centering lens L4.
FIG. (B) is a diagram showing a moving direction and a moving amount of the center O of the centering lens L4 when the centering pin 161 is moved by ± 1 mm.

The line δ1 is a locus of the center O of the centering lens L4 when the first centering pin 161a (A) is driven, that is, when the center of rotation of the centering lens L4 is the point D1.
The line δ2 is a locus of the center O of the centering lens L4 when the second centering pin 161b (B) is driven, that is, when the center of rotation of the centering lens L4 is the point D2.

In this way, the first alignment pin 161a and / or the second alignment pin 161b is driven to drive the alignment lens L4 in a direction orthogonal to (intersect) the optical axis OA (step S6).

As shown in FIG. 12B, when the first alignment pin 161a (A) is driven by δa = ± 1 mm, the amount of movement δ1 of the center O of the alignment lens L4 is δ1 ≈ ± 0.8 mm. When the second alignment pin 161b is driven by ± 1 mm, the amount of movement δ2 of the center O of the alignment lens L4 is δ2≈± 0.84 mm.
That is, when the first alignment pin 161a or the second alignment pin 161b is driven, the amount of movement of the center O of the alignment lens L4 is larger than the amount of movement of the first alignment pin 161a or the second alignment pin 161b. It becomes smaller.
Therefore, since the center O of the centering lens L4 can be moved with a resolution smaller than the resolution of the drive unit 103, the center O of the centering lens L4 can be moved more minutely.

In this way, the center O of the centering lens L4 is moved in the direction orthogonal to the optical axis OA so that the aberration is reduced, and then the process returns to step 3.
The above-mentioned example is that the alignment lens L4 is driven based on the focal length, but the present invention is not limited to this. For example, the alignment lens L4 may be driven based on the shooting distance (subject distance). Specifically, the alignment amount storage unit 120b stores in advance the optimum position information of the alignment lens L4 at each shooting distance (subject distance). In step S1, the control unit 120a determines the current shooting distance (subject distance) of the lens barrel 2 based on the amount of rotation of the focus ring 12 detected by the focus encoder 17 when the photographer turns the focus ring 12. Ask for. In step S2, the optimum position information of the centering lens L4 at the shooting distance (subject distance) is read from the centering amount storage unit 120b. Steps S3 to S6 are the same.
Further, the alignment lens L4 may be driven based on the position of the alignment lens L4 in the optical axis direction. In that case, a detection unit for detecting the position of the centering lens L4 in the optical axis direction is provided. The alignment amount storage unit 120b may store the optimum position information (alignment amount) of the alignment lens L4 at each position in the optical axis direction of the alignment lens L4. Further, a lens other than the centering lens L4 may be used. The drive unit may drive the alignment lens L4 based on any one of the focal length, the shooting distance, and the position of the lens in the optical axis direction, or may be driven by any combination.

Although the drive unit 103 has been described with the example of being attached to the facing frame 101a, it may be attached to the centering lens holding frame 102. In this case, the first engaging slot 115a, the second engaging slot 115b, and the third engaging slot 115c may be provided in the facing frame 101a.

(Effect of embodiment)
As described above, according to the present embodiment, the shift position of the centering lens L4 is changed (adjusted) so as to improve the optical performance according to the state (focal length and shooting distance) of the lens barrel 2 at the time of actual shooting. Can be done. That is, when the user is using it, the center can be adjusted according to the focal length, the shooting distance, and the like.
Therefore, at each focal length from the wide-angle end to the telephoto end and each shooting distance from the infinity end to the nearest end, it is possible to satisfactorily correct aberrations, one-sided blur, etc., and achieve good optical performance. it can.

Depending on the positional relationship between the first alignment pin 161a, the second alignment pin 161b, and the fixing pin 161c, the center O of the alignment lens L4 can be moved with a resolution smaller than the resolution of the drive unit 103. Therefore, the center O of the centering lens L4 can be moved more minutely.

Further, by adjusting the number of washers 162 in the recesses 164 provided at three locations that are substantially equal in the circumferential direction of the optical axis OA, the optical axis between the facing frame 101a and the centering lens holding frame 102 The distance in the OA direction is adjustable. As a result, the position of the centering lens L4 in the optical axis OA direction can be adjusted, and aberrations (for example, spherical aberration, curvature of field, etc.) can be adjusted.
By making the number of washers 162 in the recesses 164 at the three locations different, the tilt of the centering lens L4 can also be corrected.

Further, the facing frame 101a and the centering lens holding frame 102 sandwich the ball 163 and are urged by the coil spring 108 in a direction approaching each other. Therefore, the facing frame 101a and the centering lens holding frame 102 can move relatively and smoothly with respect to each other in the direction orthogonal to the optical axis OA.

Further, by providing the FPC 112, when the focal length of the lens barrel 2 changes between the wide-angle end and the telephoto end, the bending angle of the FPC 112 only changes, so that the FPC 112 is less likely to get entangled and the durability is improved. Not only is it improved, but less wiring space is required.

There is no need for a long FPC that directly connects the FPC 106 to the lens substrate 120, which makes it possible to reduce costs and reduce the size of the lens barrel. Further, since the lenses with less relative movement are connected, the FPC wiring is not complicated.

(Second Embodiment)
FIG. 13 is a diagram illustrating a locus of the center O of the centering lens L4 when the centering pin 161 is moved in the tangential direction of a circle centered on the optical axis OA in the second embodiment. a) is a diagram for explaining the rotation center D2 of the center O, and (b) is a diagram showing the moving direction and the amount of movement of the center O when the centering pin 161 is moved by ± 1 mm.
The difference between the second embodiment and the first embodiment is the positions of the fixing pin 161c and the third engaging slot 115c. Since other configurations are the same as those in the first embodiment, the description thereof will be omitted. Further, the same reference numerals are used in the second embodiment and the first embodiment.

In the second embodiment, the fixing pin 161c (third engaging slot 115c) is located at a position approximately 90 degrees with respect to the first alignment pin 161a (first engaging slot 115a) and the optical axis OA, and is second. It is arranged at a position symmetrical with respect to the centering pin 161b (second engaging slot 115b) with respect to the optical axis OA (position of approximately 180 °).

In the second embodiment, the relationship between the drive amount δa of the first alignment pin 161a (A) and the movement amount δ1 of the center O of the alignment lens L4 is
δa: δ1 = 1: 1
Is. That is, when the first alignment pin 161a (A) is driven by δa = ± 1 mm, the amount of movement δ1 of the center O of the alignment lens L4 is δ1 = ± 1 mm.

In the second embodiment, the relationship between the drive amount δb of the second alignment pin 161b (B) and the movement amount δ2 of the center O of the alignment lens L4 is
δb: δ2 = 1: 1 / √2
Is. That is, when the second alignment pin 161b (B) is driven by ± 1 mm, the amount of movement δ2 of the center O of the alignment lens L4 is δ2≈± 0.71 mm.

As described above, in the second embodiment, when the first alignment pin 161a is driven, the movement amount of the center O of the alignment lens L4 and the movement amount of the first alignment pin 161a can be made the same. Therefore, it is easy to control. Further, when the second alignment pin 161b is driven, the amount of movement of the center O of the alignment lens L4 can be made smaller than the amount of movement of the second alignment pin 161b. Therefore, the alignment lens L4 can be finely controlled. The other effects in the second embodiment are the same as those in the first embodiment.

(Third Embodiment)
FIG. 14 is a diagram illustrating a locus of the center O of the centering lens L4 when the centering pin 161 is moved in the tangential direction of a circle centered on the optical axis OA in the third embodiment (a). ) Is a diagram illustrating the rotation centers D1 and D2 of the center O of the centering lens L4, and (b) is the moving direction and movement of the center O of the centering lens L4 when the centering pin 161 is moved by ± 1 mm. It is a figure which shows the quantity.
The third embodiment differs from the first embodiment in the positions of the first alignment pin 161a (first engaging slot 115a) and the fixing pin 161c (third engaging slot 115c). Since other configurations are the same as those in the first embodiment, the description thereof will be omitted. Further, the same reference numerals are used in the third embodiment and the first embodiment.

In the third embodiment, the first alignment pin 161a (first engagement slot 115a) is symmetrical with respect to the second alignment pin 161b (second engagement slot 115b) about the optical axis OA (180). It is located at (° position).
The fixing pin 161c (third engaging slot 115c) is provided between the first alignment pin 161a and the second alignment pin 161b, that is, with respect to the first alignment pin 161a and the second alignment pin 161b. It is arranged at a position of 90 degrees with respect to the optical axis OA.

In the third embodiment, the relationship between the drive amount δa of the first alignment pin 161a (A) and the movement amount δ1 of the center O of the alignment lens L4 is
δa: δ1 = 1: 1 / √2
Is. That is, when the first alignment pin 161a (A) is driven by δa = ± 1 mm, the amount of movement δ1 of the center O of the alignment lens L4 is δ1≈± 0.71 mm.

In the third embodiment, the relationship between the driving amount δa of the second centering pin 161b (B) and the moving amount δ2 of the center O of the centering lens L4 is
δb: δ2 = 1: 1 / √2
Is. That is, when the second alignment pin 161b (B) is driven by ± 1 mm, the amount of movement δ2 of the center O of the alignment lens L4 is δ2≈± 0.71 mm.

As described above, in the third embodiment, when the first alignment pin 161a or the second alignment pin 161b is driven, the amount of movement of the center O of the alignment lens L4 is the first alignment pin 161a or the second alignment pin 161a. It can be made smaller than the movement amount of the pin 161b. Further, as shown in FIG. 14B, since the trajectories of δ1 and δ2 are substantially orthogonal to each other, the calculation of control is simplified and the control is easy. The other effects in the third embodiment are the same as those in the first embodiment.

As described above, as shown in the first embodiment, the second embodiment, and the third embodiment, the first alignment pin 161a (first engagement slot 115a) and the second alignment pin 161b (second engagement length). By changing the positional relationship between the hole 115b) and the third alignment pin 161c (third engaging slot 115c), the stroke and resolution of the movement of the center O of the alignment lens L4 can be changed, depending on the application. Can be used properly.

(Fourth Embodiment)
Next, the lens barrel of the fourth embodiment will be described. FIG. 15 is a schematic cross-sectional view of the centering lens holding portion 474. FIG. 16 is a cross-sectional view taken along the line X2-X2 of FIG.

The difference between the lens barrel of the fourth embodiment and the lens barrel of the first embodiment is that the drive unit 403 tilts the centering lens holding frame 402 with respect to the optical axis OA. That is, the drive unit 403 changes the inclination of the centering lens L4 with respect to the optical axis OA. Hereinafter, the differences will be described, and the description of similar parts will be omitted.

The facing frame 401a and the centering lens holding frame 402 are fitted with a gap necessary for tilting.
On the surface 401c of the facing frame 401a on the opposite side of the centering lens holding frame 402 (the subject side in the optical axis OA direction), there are three substantially even locations in the circumferential direction extending in the direction of the centering lens holding frame 402. A bottom drive portion holding recess 401d is provided. A through hole 401e that penetrates to the centering lens holding frame 402 side is provided on the bottom surface of the drive unit holding recess 401d.
As shown in FIG. 16, the cross section of the tip of the through hole 401e in the orthogonal direction with the optical axis OA is substantially rectangular, but the two sides 401e1 extending substantially radially from the optical axis OA are parallel to each other and with respect to the optical axis OA. A pair of opposing sides 401e2, which are inward and outward in the radial direction, are curved outward in a convex shape.

(Position detector)
On the outer diameter side of the through hole 401e on the surface 401g of the facing frame 401a on the alignment lens holding frame 402 side (mount side in the optical axis OA direction), a protruding portion 401f protruding toward the alignment lens holding frame 402 is provided. Has been done.
Further, the centering lens holding frame 402 is provided with a protruding portion 402a that protrudes toward the facing frame 401a. The protrusion 401f is located on the inner diameter side of the protrusion 402a.

The FPC (flexible printed circuit board) 106 is arranged so as to surround the outer periphery of the centering lens moving cylinder 401 on the optical axis OA direction mount side. A Hall element 407 is attached to the outer diameter side of the FPC 106 extending from the outer diameter side of the protrusion 401f.
On the other hand, a magnet 409 is attached to the inner diameter side of the protrusion 402a. The Hall element 407 and the magnet 409 form a position detection unit 450. The position detection unit 450 detects the positional relationship between the facing frame 401a and the centering lens holding frame 402.

Similar to the first embodiment, the FPC 106 is connected to the FPC 112 on the side surface 401c of the subject in the optical axis OA direction of the facing frame 401a.
The FPC 112 is attached to the third group lens holding portion 73 and connected to the FPC 111 which sends power and a signal to the electromagnetic drive diaphragm 110, and the FPC 111 is connected to the lens substrate 120 attached to the fixed cylinder 3 (32).

(Drive unit 403)
A drive unit 403 is arranged and fixed inside each of the three drive unit holding recesses 401d of the facing frame 401a. The three drive units 403 (that is, the drive unit holding recesses 401d) are arranged substantially evenly in the circumferential direction about the optical axis OA so that the angles between them are about 120 °.

In the present embodiment, the drive unit 403 is a stepping motor, and a lead screw 404 extends from the drive unit 403 to the centering lens holding frame 402 side through the through hole 401e. The lead screw 404 is rotated by driving the drive unit 403. The drive unit 403, the reed screw 404, and the tilt adjusting nut 405, which will be described later, may be considered as the drive unit.

(Tilt adjustment nut 405)
A tilt adjusting nut 405 is screwed into each reed screw 404. The tilt adjusting nut 405 is arranged between the drive unit 403 and the centering lens holding frame 402. The inner surface of the tilt adjusting nut 405 is threaded and screwed so as to be rotatable relative to the lead screw 404. A rounded contact portion 405a is provided on the tip end side of the tilt adjusting nut 405.
The side surface of the tilt adjusting nut 405 has a shape substantially similar to the cross-sectional shape of the tip of the through hole 401e, and has a substantially rectangular shape, and two sides extending in the substantially radial direction from the optical axis OA are parallel to each other and face each other in the radial direction. A set of sides is curved outward in a convex shape.
A rotation stop structure is formed by two parallel sides 401e1 extending substantially in the radial direction from the optical axis OA of the through hole 401e and two parallel sides of the side surface of the tilt adjusting nut 405.

When the lead screw 404 rotates, the tilt adjusting nut 405 is guided straight forward by this rotation stop structure and moves forward and backward in the optical axis OA direction without rotating.

The inclination of the alignment lens holding frame 402 (alignment lens L4) with respect to the optical axis OA can be adjusted by the positions of the contact portions 405a provided at the tips of the three tilt adjustment nuts 405 in the optical axis OA direction. .. That is, when the tilt adjusting nut 405 moves in the optical axis direction, the contact portion 405a pushes a part of the alignment lens holding frame 402, so that the alignment lens holding frame 402 (alignment lens L4) is tilted with respect to the optical axis OA. Can be adjusted. The tilt adjusting nut 405 drives the centering lens holding frame 402 with respect to the facing frame 401a to change the tilt of the centering lens holding frame 402 (centering lens L4) with respect to the optical axis OA.

At this time, the position detection unit 450, the Hall elements 407 attached to the facing frame 401a at three locations in the circumferential direction, and the magnets 409 attached to the centering lens holding frame 402 at three locations in the circumferential direction The position and inclination of the centering lens holding frame 402 with respect to the facing frame 401a can be detected.

(Coil spring 408)
As shown in FIG. 15, between the facing frame 401a and the centering lens holding frame 402, a coil spring 408 that urges the facing frame 401a and the centering lens holding frame 402 in a direction approaching each other is provided on the optical axis OA. It is attached to three places that are substantially even along the circumference of a predetermined diameter centered on. As a result, the backlash between the facing frame 401a and the centering lens holding frame 402 can be reduced. Further, since the coil spring 408 urges the facing frame 401a and the centering lens holding frame 402 in the direction of approaching each other, the centering lens holding frame 402 is brought into contact with the contact portion 405a of the tilt adjusting nut 405. Can be done.

In the fourth embodiment, the alignment amount storage unit 120b shown in FIG. 9 is provided with the optimum alignment position information (tilt position information) of the alignment lens L4 at each focal length from the wide-angle end to the telephoto end. It is stored in advance at the time of manufacture.
Then, according to the same flow as in FIG. 10 of the first embodiment, the alignment control in the tilt direction of the lens barrel is performed.

That is, when the photographer turns the zoom ring 6, the control unit 120a obtains the current focal length of the lens barrel 2 based on the amount of rotation of the zoom ring 6 detected by the zoom encoder 90. (Step S1)

The control unit 120a provides the centering position information (tilt position information) of the centering lens L4 that improves the optical performance of the lens barrel 2 (reduces aberration and reduces one-sided blur) at the focal length. Read from the storage unit 120b. (Step S2)

The control unit 120a detects the current position of the alignment lens holding frame 402 (alignment lens L4) with respect to the facing frame 401a by the position detection unit 450.
Then, the detection position of the alignment lens holding frame 402 (alignment lens L4) detected by the position detection unit 450 is compared with the alignment position of the alignment lens L4 stored in the alignment amount storage unit 120b. .. (Step S3)

When the position difference between the detection position of the alignment lens L4 detected by the position detection unit 450 and the alignment position stored in the alignment amount storage unit 120b of the control unit 120a is equal to or less than the threshold value (step S4, YES). , End the alignment control of the lens barrel 2 When the position difference is larger than the threshold value (step S4, NO), the drive amount of the alignment lens L4 is calculated. (Step S5)

The control unit 120a drives at least one of the three drive units 403 based on the calculated drive amount to rotate the reed screw 404 (step S6). Then, the tilt adjusting nut 405 moves back and forth along the lead screw 404. You may drive three drive units 403.
As a result, alignment control in the tilt direction of the lens barrel is performed. In this way, after changing the inclination of the alignment lens holding frame 402 (alignment lens L4), the process returns to step S3.

Although the example of changing the inclination of the alignment lens holding frame 402 (alignment lens L4) based on the focal length has been described as an example, the present invention is not limited to this. For example, the inclination of the alignment lens holding frame 402 (alignment lens L4) may be changed based on the shooting distance (subject distance). Specifically, the alignment amount storage unit 120b stores in advance the optimum tilt position information of the holding frame 402 (alignment lens L4) at each shooting distance (subject distance). In step S1, the control unit 120a determines the current shooting distance (subject distance) of the lens barrel 2 based on the amount of rotation of the focus ring 12 detected by the focus encoder 17 when the photographer turns the focus ring 12. Ask for. In step S2, the optimum tilt position information of the centering lens L4 at the shooting distance (subject distance) is read from the centering amount storage unit 120b. Steps S3 to S6 are the same.
Further, the inclination of the alignment lens holding frame 402 (alignment lens L4) may be changed based on the position of the alignment lens holding frame 402 (alignment lens L4) in the optical axis direction. In that case, a detection unit for detecting the position of the centering lens L4 in the optical axis direction is provided. The alignment amount storage unit 120b may store the optimum tilt position information (alignment amount) of the alignment lens L4 at each position in the optical axis direction of the alignment lens L4. Further, a lens other than the centering lens L4 may be used. The drive unit may drive the alignment lens L4 based on any one of the focal length, the shooting distance, and the position of the lens in the optical axis direction, or may be driven by any combination.

Although the drive unit 403 has been described in the example of being attached to the facing frame 401a, it may be attached to the centering lens holding frame 402. In this case, the contact portion 405a can push the facing frame 401a to adjust the inclination of the centering lens holding frame 402 with respect to the optical axis OA.

As described above, according to the present embodiment, the tilt position (tilt) of the centering lens L4 with respect to the optical axis OA is changed so as to improve the optical performance according to the focal length and the shooting distance of the lens barrel at the time of actual shooting. Can be done. In other words, the alignment lens L4 is tilted with respect to the optical axis OA according to the position of the alignment lens L4 and the positional relationship between the alignment lens L4 and another lens, and the alignment is adjusted so that the optical performance is improved. be able to.
Therefore, it is possible to satisfactorily correct aberrations, one-sided blur, etc. at each shooting distance from the infinity end to the nearest end and each focal length from the wide-angle end to the telephoto end, and to achieve good optical performance. ..

In the fourth embodiment, the drive units 403 are provided at three locations centered on the optical axis OA. By driving the drive unit 403 and moving the contact portions 405a of the three tilt adjustment nuts 405 by the same amount, the position of the centering lens L4 in the optical axis OA direction can be adjusted. The alignment operation may be performed by adjusting the position in the optical axis OA direction so that the optical performance is improved.
Further, if only tilt adjustment is performed, the drive unit 403 is set to two places, and the drive unit is abolished and a fixed spherical protrusion is provided at the remaining one place so as to receive the centering lens holding frame 402. May be good. This makes it possible to reduce costs.

(Fifth Embodiment)
Next, the lens barrel of the fifth embodiment will be described. FIG. 17 is a schematic cross-sectional view of the centering lens holding portion 574. FIG. 18 is a cross-sectional view taken along the line X3-X3 of FIG.

The difference between the lens barrel of the fifth embodiment and the lens barrel of the fourth embodiment is that the drive unit 503 is not a stepping motor but a linear motor (linear actuator). Hereinafter, the differences will be described, and the description of similar parts will be omitted.

(Drive 503)
The drive unit 503 includes a piezoelectric element 503b, which is an electromechanical conversion element that expands and contracts in the axial direction, and a fixed unit 503a attached to the subject side in the optical axis OA direction.
The fixing portion 503a is fixed to the facing frame 501a. Therefore, the displacement due to the expansion and contraction of the piezoelectric element 503b occurs on the drive shaft 504 extending toward the mount side in the optical axis OA direction of the piezoelectric element 503b. The piezoelectric element 503b, the fixed portion 503a, the drive shaft 504, and the tilt adjusting cylinder 505, which will be described later, may be considered as a drive portion.

(Tilt adjustment cylinder 505)
A tilt adjusting cylinder 505 is fitted to the drive shaft 504.
The tilt adjusting cylinder 505 includes a cylindrical portion and a hemispherical contact portion 505a provided at the tip of the cylindrical portion. The cylindrical portion is fitted to the drive shaft 504 and engaged by frictional force.

When the drive unit 503 is energized and the piezoelectric element 503b vibrates in the axial direction, the drive shaft 504 reciprocates in the optical axis OA direction due to this vibration.
At this time, when the vibration speed of the drive shaft 504 is low, the tilt adjusting cylinder 505 frictionally engaged with the drive shaft 504 also moves following the vibration.
Further, when the vibration speed of the drive shaft 504 becomes high, the tilt adjusting cylinder 505 does not follow the drive shaft 504 and does not move in the optical axis OA direction.
By repeatedly vibrating the drive shaft 504 in the optical axis OA direction at different speeds of low speed and high speed, the tilt adjusting cylinder 505 can be moved in the optical axis OA direction of the drive shaft 504. When the energization of the drive shaft 504 is stopped, the tilt adjusting cylinder 505 comes to rest at that position. As a result, the tilt adjusting cylinder 505 can push a part of the centering lens holding frame 502 to change the tilt of the centering lens L4.

Since the drive shaft 504 and the tilt adjusting cylinder 505 do not rotate in the fifth embodiment, it is not necessary to provide a rotation stop structure as in the fourth embodiment to guide the vehicle in a straight line. Therefore, the cross-sectional shapes of the through hole 501e and the tilt adjusting cylinder 505 can be circular.
A slight gap is provided between the inner diameter of the through hole 501e and the outer diameter of the tilt adjusting cylinder 505. Therefore, the movement of the tilt adjusting cylinder 505 in the optical axis OA direction is not hindered by friction with the tilt adjusting cylinder 505.

In the fifth embodiment as well, as in the fourth embodiment, the centering amount storage unit 120b shown in FIG. 9 has each focal length, each subject distance (shooting distance), or centering from the wide-angle end to the telephoto end. Optimal alignment position information (tilt position information) of the alignment lens L4 at the position of the lens L4 in the optical axis direction is stored in advance at the time of manufacture.
Then, as in the first to fourth embodiments, the alignment control in the tilt direction of the lens barrel is performed according to the same flow as in FIG. Although the example in which the drive unit 503 is provided on the facing frame 501a has been described, the drive unit 503 may be provided on the centering lens holding frame 502. In this case, the tilt adjusting cylinder 505 can change the tilt of the centering lens L4 by pushing a part of the facing frame 501a.

As described above, according to the present embodiment, the tilt position (tilt) of the centering lens L4 is changed so as to improve the optical performance according to the focal length and the shooting distance (subject distance) of the lens barrel 2 at the time of actual shooting. can do.
Therefore, it is possible to satisfactorily correct aberrations, one-sided blur, etc. at each shooting distance from the infinity end to the nearest end and each focal length from the wide-angle end to the telephoto end, and to achieve good optical performance. ..

Further, also in the present embodiment, the position of the alignment lens L4 in the optical axis OA direction can be adjusted by adjusting the tilt adjustment cylinder 505 by the same amount at three locations. Since the group spacing with the third group lens L3 can be adjusted, it is possible to adjust various aberrations such as spherical aberration and curvature of field.
If only tilt adjustment is to be performed, the drive unit 503 is set to two places, and the drive unit is abolished and a fixed spherical protrusion is provided at the remaining one place so as to receive the centering lens holding frame 502. May be good. This makes it possible to reduce costs.

(Sixth Embodiment)
Next, the lens barrel of the sixth embodiment will be described. FIG. 19 is a schematic cross-sectional view of the centering lens holding portion 674. FIG. 20 is a cross-sectional view taken along the line X4-X4 of FIG.

The sixth embodiment is obtained by adding the drive unit 653 (653a, 653b) for the shift drive of the first embodiment to the drive unit 603 for tilt adjustment provided in the fourth embodiment.

That is, as in the fourth embodiment, the surface 601c of the facing frame 601a of the centering lens holding portion 674 on the opposite side of the centering lens holding frame 602 (the subject side in the optical axis OA direction) is substantially equal in the circumferential direction. Bottomed drive unit holding recesses 601d extending in the direction of the centering lens holding frame 602 are provided at three locations. A through hole 601e that penetrates to the alignment lens holding frame 602 side is provided on the bottom surface of the drive unit holding recess 601d.
As shown in FIG. 20, the cross section of the tip of the through hole 601e in the direction orthogonal to the optical axis OA is substantially rectangular, but the two sides 601e1 extending in the substantially radial direction from the optical axis OA are parallel to each other and with respect to the optical axis OA. A pair of opposing sides 601e2 that are radially inward and outward are curved outward in a convex shape.

(Drive unit 603)
A drive unit 603 is arranged and fixed inside each of the three drive unit holding recesses 601d of the facing frame 601a.

In the present embodiment, the drive unit 603 is a stepping motor, and a lead screw 604 extends from the drive unit 603 through the through hole 601e to the alignment lens holding frame 602 side. The lead screw 604 is rotated by driving the drive unit 603.

(Tilt adjustment nut 605)
A tilt adjusting nut 605 is screwed into each reed screw 604.
However, unlike the fourth embodiment, the tip portion 605a of the tilt adjusting nut 605 arranged in the alignment lens holding portion 674 is flat and does not directly contact the alignment lens holding frame 602.
A ball 608 is arranged between the centering lens holding frame 602 and the tip end portion 605a of the tilt adjusting nut 605. The tip portion 605a of the tilt adjusting nut 605 presses the centering lens holding frame 602 in the optical axis OA direction via the ball 608.
The side surface of the tilt adjusting nut 605 has a shape substantially similar to the cross-sectional shape of the tip of the through hole 601e, and is substantially rectangular and has two sides extending substantially radially from the optical axis OA, which are parallel to each other and are opposed to each other in the radial direction. A set of sides is curved outward in a convex shape.
A rotation stop structure is formed by two parallel sides 601e1 extending substantially in the radial direction from the optical axis OA of the through hole 601e and two parallel sides of the side surface of the tilt adjusting nut 605.

The tilt adjusting nut 605 moves back and forth in the optical axis OA direction when the lead screw 604 rotates. Then, the balls 608 arranged at the tips of the three tilt adjusting nuts 605 also move forward and backward in the optical axis OA direction. The inclination of the centering lens holding frame 602 with respect to the optical axis OA can be adjusted by the position of the ball 608 in the optical axis OA direction.

Further, as in the first embodiment, the centering lens holding frame 602 has three engaging elongated holes (first engaging elongated hole 615a, second engaging elongated hole 615b, and third engaging elongated hole 615c). Is provided.

(Position detector 150)
Hall elements 607 are attached to two positions on the side of the centering lens holding frame 602 of the facing frame 601a. On the other hand, a magnet 659 is attached at a position facing the Hall element 607 on the facing frame 601a side of the centering lens holding frame 602.

(Drive unit 603)
Two drive units 653 (653a, 653b) are attached to the centering lens holding frame 602 side of the facing frame 601a.

The drive unit 653 is a stepping motor, and lead screws 654 (654a, 654b) that are rotated by the drive of the drive unit 653 extend from the drive unit 653.

(Moving frame 660)
A moving piece 660 (660a, 660b) is attached to the lead screw 654. Alignment pins 661 (661a, 661b) extend from the outer surface of the moving frame 660 to the alignment lens holding frame 602 side. The alignment pins 661a and 661b are inserted into the first engaging slot 615a and the second engaging slot 615b described above, respectively.

(Fixing pin 661c)
Further, a fixing pin 661c extends to the alignment lens holding frame 602 side at a position corresponding to the above-mentioned third engaging slot 615c in the facing frame 601a, and is inserted into the third engaging slot 615c.

In the sixth embodiment, the alignment amount storage unit 120b shown in FIG. 9 is manufactured with the optimum shift position information and tilt position information of the alignment lens L4 at each focal length from the wide-angle end to the telephoto end. It is stored in advance at times.
Then, according to the same flow as in FIG. 10 of the first embodiment, the alignment control in the shift direction and the tilt direction of the lens barrel is performed.

As described above, also in the sixth embodiment, as in the first embodiment and the like, the shift position of the centering lens L4 is adjusted so that the optical performance is improved according to the focal length and the shooting distance of the lens barrel 2 at the time of actual shooting. Can be changed.
Further, as in the fourth embodiment and the like, the shift and tilt positions of the centering lens L4 can be changed so as to improve the optical performance according to the focal length and the shooting distance of the lens barrel 2 at the time of actual shooting. it can.
Therefore, aberration and one-sided blur can be satisfactorily corrected at each shooting distance from the infinity end to the nearest end and at each focal length from the wide-angle end to the telephoto end, and good optical performance can be achieved.

Further, also in the present embodiment, the position of the centering lens L4 in the optical axis OA direction can be adjusted by adjusting the tilt adjustment nut 605 by moving the same amount at three points. As a result, the group spacing from the third group lens L3 can be adjusted, so that aberrations such as spherical aberration and curvature of field can be adjusted.
If only tilt adjustment is to be performed, the drive unit 603 may be set to two places, and the drive unit may be abolished and a fixed ball receiving part may be provided at the remaining one place to receive the centering lens holding frame 602. Well, this makes it possible to reduce costs.

In the present embodiment, the centering lens holding frame 602 is in contact with the facing frame 601a via the ball 608 in a state of being urged by the coil spring 609, so that the shift and tilt adjustments can be smoothly performed without rattling. Can be done.

(Transformed form)
In the above-described embodiment, the centering amount storage unit stores the optimum position information of the centering lens L4 at each focal length, but the present invention is not limited to this. In addition to or instead of the optimum position information at each focal length, the optimum position information of the centering lens L4 at each shooting distance from the infinity end to the nearest end is stored. You may.

In the above-described embodiment, the lens closest to the camera body in the optical axis OA direction is a centering lens, but the lens is not limited to this and may be a lens at any position.

In the fourth, fifth, and sixth embodiments, the drive units are provided at three places, but the present invention is not limited to this, and the drive units may be provided at two places. Further, in the first, second, and third embodiments, the drive units are provided at two locations, but the present invention is not limited to this, and the drive units may be arranged at the fixed point C to be at three locations.

In the above-described embodiment, the drive unit is provided on the alignment lens moving cylinder side, but the present invention is not limited to this, and the drive unit may be provided on the alignment lens holding frame side.
Further, the Hall element is provided on the centering lens moving cylinder side and the magnet is provided on the centering lens holding frame side, but the present invention is not limited to this, and the Hall element is provided on the centering lens holding frame side and the magnet is provided on the centering lens moving frame side. It may be provided in.

In the first to third embodiments and the sixth embodiment, the stepping motor is used as the drive unit, but the present invention is not limited to this, and an ultrasonic motor or a linear motor may be used. When a stepping motor is used, the position of the reed screw 104 can be maintained even when the power is not supplied. If the shaft portion of the drive unit does not rotate, the rotation stop structure can be omitted.

In the above-described embodiment, the form in which the camera body and the lens barrel are detachable will be described, but the present invention is not limited to this, and the camera body and the lens barrel may be integrated.

In the above embodiment, the FPC connected to the drive unit is connected to the third group lens holding unit to which the electromagnetic drive diaphragm is connected. However, depending on the lens configuration, it may be connected to a lens holding portion to which another member such as a blur-aligned lens is attached.

It is also possible to use a camera shake correction lens as the centering lens. However, in general, a camera shake correction lens often has a small effect on aberrations, so it is conceivable to use a lens other than the camera shake correction lens that has a relatively large effect on aberrations for alignment.

The angles mentioned above do not necessarily have to be perfect. For example, even if it is described as 90 degrees, it may include some errors.

(7th Embodiment)
Next, the lens barrel of the seventh embodiment will be described. FIG. 21 is a schematic cross-sectional view of the centering lens holding portion 774 of the seventh embodiment. FIG. 22 is a cross-sectional view taken along the line DD of FIG.
Note that FIG. 21 is a schematic cross-sectional view of FIG. 22 starting from a1 and passing through the coil spring 712, the long V-groove 710 and the magnet 715, the optical axis OA, the conical hole 708 and the magnet 715 so that the relationship to a2 can be understood. Is.
22 (b) is a schematic cross-sectional view starting from b1 of (a), passing through the Hall element 714 and the coil spring 712 to b2, and (c) is drawn along line c of (a). It is a schematic cross-sectional view along.
FIG. 23 is an enlarged cross-sectional view of the shift adjusting nut 705. FIG. 24 is a partially enlarged cross-sectional view of FIG. 22 (c). FIG. 25 is a partially enlarged cross-sectional view of FIG. 24 showing an engaging portion between the lead screw 704 and the shift adjusting nut 705. In the following description, the subject side in the optical axis OA direction will be described as the front, and the camera body side in the optical axis OA direction will be described as the rear.

For example, a drive unit 703, which is a stepping motor, is fixed at two places on the rear end surface of the centering lens moving cylinder 701.

As shown in FIG. 22, the lead screw 704 extends from the drive unit 703 in the tangential direction of the circle centered on the optical axis OA. As shown in FIG. 25, a shift adjusting nut 705 partially provided with a screw portion 706 is screwed into the lead screw 704 of the drive portion 703.

As shown in FIG. 22, the drive unit mounting frame 703a includes a frame base end plate 703aa that penetrates and holds the base end side of the lead screw 704, and a frame tip plate 703ab that penetrates and holds the tip end side. It has a frame side end plate 703ac that is connected and extends in parallel with the lead screw 704.

As shown in FIG. 23, the shift adjusting nut 705 is provided with an opening 707, and the bottom portion (upper part in FIG. 23) of the opening 707 is partially provided with a threaded portion 706 as shown in FIG. There is.
The shift adjusting nut 705 is attached to the reed screw 704 from the rear side, and the threaded portion 706 is screwed with the threaded portion of the reed screw 704.

A conical hole 708 is provided in the rear end surface (upper surface in FIG. 23) of the shift adjusting nut 705 on the side opposite to the side where the opening 707 is provided. As shown in FIG. 21, the ball 709 arranged in the conical hole 708 is in contact with the inner surface of the conical hole 708 and the inner surface of the long V-groove 710 provided on the front end surface of the centering lens holding frame 702.

As shown by the alternate long and short dash line in FIG. 22, the long V-grooves 710 are provided at three locations on the front end surface of the centering lens holding frame 702. The balls 709 are also arranged in three places in the same manner. Two of the balls 709 (bottom and right in the figure) were fitted into the conical holes 708 of the shift adjustment nut 705, and the other one (upper left in the figure) was provided on the rear end surface of the centering lens moving cylinder 701. It is fitted in the conical hole 711.

Coil springs 712 are attached at three points in the circumferential direction between the rear end surface of the centering lens moving cylinder 701 and the front end surface of the centering lens holding frame 702. The coil spring 712 urges the centering lens holding frame 702 with respect to the centering lens moving cylinder 701 only via the ball 709, the shift adjusting nut 705 and the lead screw 704, or the ball 709 in front of the optical axis OA direction. ing.

As shown in FIGS. 22 (a) and 22 (b), the FPC 713 extends to the rear end of the centering lens moving cylinder 701, and Hall elements 714 are attached to the upper and left sides of the FPC 713 in the drawing. Has been done.

A magnet 715 is attached to a portion of the centering lens moving cylinder 701 facing the Hall element 714 at two locations on the front end surface of the centering lens holding frame 702 to hold the centering lens with respect to the centering lens moving cylinder 701. The amount of shift movement in two directions intersecting each other on the plane orthogonal to the optical axis OA of the frame 702 is detected.

FIG. 24 is an enlarged view of FIG. 22 (c), in which a ball 709 fitted in a conical hole 708 of a shift adjustment nut 705 that is partially screwed with a lead screw 704 and a long V-groove of a centering lens holding frame 702. The engaging portion with 710 is shown.

As shown in FIG. 25, the threaded portion 706 of the shift adjusting nut 705 is not provided over the entire length direction of the lead screw 704. A region (gap S) in which the screw portion 706 is not formed is sandwiched between the two, and the screw portion 706 is formed on one side and the other side in the length direction. The pitch in one threaded portion 706a, the pitch in the other threaded portion 706b, and the pitch of the lead screw 704 are P, respectively.
However, the length of the gap S between one threaded portion 706a and the other threaded portion 706b is not an integral multiple of P. The gap S is between the apex of the last mountain on one threaded side and the apex of the last mountain on the other threaded side.

As shown in the figure, the gap S contains four reed screw ridges, and the length of the four reed screw ridges is 4P. However, the length of the gap S is 2 × ΔP longer than 4P.

Therefore, according to the present embodiment, when the shift adjusting nut 705 is urged against the lead screw 704 by the coil spring 712 in the direction of the arrow in FIG. 25, the right side surface of the threaded portion 706a of the shift adjusting nut 705 in the drawing. Is in contact with the left side surface of the threaded portion of the lead screw 704 in the drawing. The left side surface of the threaded portion 706b of the shift adjusting nut 705 is in contact with the right side surface of the threaded portion of the lead screw 704 in the drawing.
That is, since no play occurs, no idling occurs when the lead screw 704 rotates to move the shift adjustment nut 705 to the right side or to the left side.

As described above, according to the present embodiment, when the alignment lens holding frame 702 is shift-adjusted with respect to the alignment lens moving cylinder 701, there is no play in each engaging portion between the constituent members, so that the shift adjustment is highly accurate. Is possible, and the optical performance can be improved.

Further, similarly to the above-described degree of embodiment, the shift of the centering lens holding frame 702, that is, the centering lens L4 with respect to the centering lens moving cylinder 701 can be adjusted by each shift movement of the shift adjusting nut 705. It is possible to improve optical performance defects such as.

Further, when the shift is adjusted, the ball 709 rolls with respect to the long V-groove 710, so that the frictional resistance is reduced, the drive load of the drive unit 703 is reduced, and the power consumption is reduced.

(8th Embodiment)
Next, the eighth embodiment will be described. The eighth embodiment is different from the seventh embodiment in the shape of the shift adjusting nut. Since the other configurations are the same, the description of the same parts will be omitted. 26 is a view showing the shape of the shift adjusting nut 816 according to the eighth embodiment, where FIG. 26A is a top view and FIG. 26B is a cross-sectional view. FIG. 27 is a partially enlarged cross-sectional view in which a shift adjusting nut 816 is screwed into a lead screw 804 of a drive unit (not shown).

A shift adjusting nut 816 provided with a threaded portion 817 is screwed to the lead screw 804. The shift adjusting nut 816 is provided with an opening 818.

Further, a conical hole 819 and a slit 820 are provided on the rear end surface (upper surface in FIG. 26) of the shift adjusting nut 816 on the side opposite to the side where the opening 818 is provided. The material of the shift adjusting nut 816 is preferably POM or the like, which has appropriate elasticity, a small friction coefficient, and is easy to mold.

As shown in FIG. 26A, the slit 820 extends in a direction orthogonal to the optical axis OA. That is, as shown in FIG. 26B, the portion of the shift adjusting nut 816 provided with the slit 820 has a thickness t of which the shift adjusting nut 816 is thinner than the other portions.
Therefore, the shift adjusting nut 816 is easily deformed so that the upper part of the slit 820 is spaced apart as shown by the arrow in FIG. 26B and both ends below the shift adjusting nut 816 move downward.

As shown in FIG. 27, the ball 809 arranged in the conical hole 819 is in contact with the inner surface of the conical hole 819 and the inner surface of the long V-groove 810 provided on the front end surface of the centering lens holding frame 802.

Here, when the shift adjustment nut 816 is screwed into the lead screw 804, due to the accumulation of machining accuracy errors of the components, the frame side end plate 803ac of the drive unit mounting frame of the drive unit as shown in the left cross section of FIG. 27. A gap d may occur between the upper surface and the lower surface of the shift adjustment nut 816.

When the drive unit is driven and the lead screw 804 rotates, if there is no gap d between the upper surface of the frame side end plate 803ac of the drive unit mounting frame of the drive unit and the lower surface of the shift adjustment nut 816, the shift adjustment nut 816 is simultaneously provided. Moves in the axial direction at the same time as the rotation of the lead screw 804.

However, when the gap d is generated, the shift adjusting nut 816 rotates by the amount of the gap d. Then, after a part of the lower surface of the shift adjusting nut 816 comes into contact with the upper surface of the frame side end plate 803ac and stops rotating, the shift adjusting nut 816 starts moving in the axial direction.

Therefore, a delay occurs between the start of rotation of the lead screw 804 and the start of axial movement of the shift adjustment nut 816. Therefore, it becomes an adjustment error when the alignment lens holding frame 802 is driven by the drive of the drive unit, that is, the shift adjustment of the alignment lens L4 is performed.

In the present embodiment, when the ball 809 is urged in the direction of arrow A1 as shown in the right cross section of FIG. 27 by the urging force of the coil spring against the centering lens holding frame 802, the conical hole 819 of the shift adjusting nut 816 The inner surface is pressed.

Then, since the thickness of the slit 820 portion of the shift adjustment nut 816 is a thin thickness t, the shift adjustment nut 816 has a gap at the upper part of the slit 820, and both ends under the shift adjustment nut 816 move downward. It is easy to deform as it does.
Therefore, as shown by A2 in the drawing, the shift adjusting nut 816 is elastically deformed to open the space above the slit 820, and both ends of the lower portion of the shift adjusting nut 816 are deformed so as to move downward.
Then, the lower corner portion P of the centering lens holding frame 802 comes into contact with the frame side end plate 803ac of the drive portion, and the gap d disappears.

Therefore, when the drive unit is driven and the lead screw 804 is rotated, there is no gap d between the upper surface of the frame side end plate 803ac of the drive unit mounting frame of the drive unit and the lower surface of the shift adjustment nut 816. At the same time as the rotation of the 804, the shift adjusting nut 816 moves in the axial direction at the same time as the rotation of the lead screw 804.

Therefore, according to the present embodiment, when the alignment lens holding frame 802, that is, the alignment lens L4 is adjusted by driving the drive unit, the shift adjustment can be performed with high accuracy, and the optical performance is improved.

(9th Embodiment)
Next, the lens barrel of the ninth embodiment will be described.
FIG. 28 is a schematic cross-sectional view of the centering lens holding portion 974 of the ninth embodiment.
FIG. 29 is a cross-sectional view taken along the line EE of FIG. 28 of the ninth embodiment.
It should be noted that FIG. 28 is a schematic cross section described in FIG. 29 starting from a1 and passing through the coil spring 912, the left long V-groove 910, the sphere portion 908, the optical axis OA, and the sphere portion 909 so that the positional relationship to a2 can be understood. It is a figure.
(B) of FIG. 29 is a schematic cross-sectional view starting from b1 of (a), passing through the Hall element 914 and the coil spring 912 to b2 so that the positional relationship can be understood, and (c) is drawn along line c of (a). It is a cross-sectional view along.
FIG. 30 is an enlarged cross-sectional view of the shift adjusting nut 905. FIG. 31 is an enlarged cross-sectional view of the portion shown in FIG. 29 (c).

For example, a drive unit 903, which is a stepping motor, is fixed at two places on the rear end surface of the centering lens moving cylinder 901.

A lead screw 904 extends from the drive unit 903 in the tangential direction of a circle centered on the optical axis OA. The tip of the lead screw 904 is attached to the drive unit mounting frame 903a of the drive unit 903. Further, a shift adjusting nut 905 provided with a threaded portion 906 is screwed to the lead screw 904 of the drive portion 903.

The shift adjusting nut 905 is provided with an opening 907, and the bottom portion (upper portion in FIG. 30) of the opening 907 is partially provided with a threaded portion 906.
The shift adjusting nut 905 is attached to the reed screw 904 from the rear, and the screw portion 906 is screwed with the screw of the reed screw 904.

A spherical portion 909 is provided on the rear end surface (upper side in FIG. 30) of the shift adjusting nut 905 on the side opposite to the side where the opening 907 is provided. The spherical portion 909 is in contact with two of the three elongated V-grooves 910 (bottom and right in FIG. 29) provided on the front end surface of the centering lens holding frame 902.

On the other hand, the other one of the long V-grooves 910 (upper left in FIG. 29) is in contact with the spherical portion 908 provided on the rear end surface of the centering lens moving cylinder 901.

Coil springs 912 are attached at three locations in the circumferential direction between the rear end surface of the centering lens moving cylinder 901 and the front end surface of the centering lens holding frame 902. By the coil spring 912, the centering lens holding frame 902 is driven forward of the centering lens moving cylinder 901 in the optical axis OA direction by the spherical part 908 at one place and the spherical part 909 of the shift adjustment nut 905 and the other two places. It is urged through part 903.

As shown in FIGS. 29 (a) and 29 (b), the FPC 913 extends to the rear end of the centering lens moving cylinder 901, and Hall elements 914 are attached to the upper and left sides of the FPC 913 in the figure. Has been done.

A magnet 915 is attached to a portion of the centering lens moving cylinder 901 facing the Hall element 914 at two locations on the front end surface of the centering lens holding frame 902 to hold the centering lens with respect to the centering lens moving cylinder 901. The amount of shift movement in two directions intersecting each other on the plane orthogonal to the optical axis OA of the frame 902 is detected.

FIG. 31 is an enlarged view of FIG. 29 (c), and is an engagement portion between the spherical portion 909 of the shift adjustment nut 905 that is partially screwed with the lead screw 904 and the long V groove 910 of the centering lens holding frame 902. Is shown.

According to the present embodiment, since the shift adjusting nut 905 is integrated with the spherical portion 909, the number of parts can be reduced and the assembly man-hours can be reduced, so that the cost can be reduced.

Further, also in the present embodiment, as in FIG. 25 of the seventh embodiment, the threaded portion 906 of the shift adjusting nut 905 is provided on one side and the other side in the length direction with a region in which no screw is formed. It is formed. The gap between one screw and the other screw is not an integral multiple of P, and one screw and the other screw are set so as to deviate from the lead screw 904 by ΔP. ing.

Therefore, as in the seventh embodiment, when the shift adjusting nut 905 is urged against the lead screw 904 by the coil spring 912 in the direction of the arrow in FIG. 25 (in the direction of the optical axis OA), no play occurs. It has the effect that idling does not occur when the lead screw 904 rotates to move the shift adjustment nut 905.

Further, as in the above-described embodiment, the shift of the alignment lens holding frame 902, that is, the alignment lens L4 with respect to the alignment lens moving cylinder 901 can be adjusted by each shift movement of the shift adjustment nut 905, so that the image plane can be adjusted. It is possible to improve optical performance defects such as asymmetry (one-sided blur).

Further, when the alignment lens holding frame 902 is shifted and adjusted with respect to the alignment lens moving cylinder 901, all the backlash of each engaging portion between the constituent members is canceled, so that highly accurate shift adjustment becomes possible. , Optical performance can be improved.

(10th Embodiment)
Next, the lens barrel of the tenth embodiment will be described. FIG. 32 is a schematic cross-sectional view of the centering lens holding portion 1074 of the tenth embodiment. FIG. 33 is a cross-sectional view taken along the line FF of FIG. 32 of the tenth embodiment. Note that FIG. 32 is a cross-sectional view of FIG. 33 in the a1-a2 direction. (B) of FIG. 33 is a cross-sectional view taken along the line b of (a). (C) of FIG. 33 is a cross-sectional view taken along the line c of (a).
It should be noted that FIG. 32 shows the relationship starting from a1 in FIG. 33, passing through the magnet 1015 in the upper part of FIG. 33, the Hall element 1014, the sphere portion 1008, the optical axis OA, the sphere portion 1008 in the lower left, and the coil spring 1012 to a2. It is a schematic cross-sectional view described as described above.

In the centering lens moving cylinder 1001, fixed portions 1004 of the drive unit 1003, which is a linear motor (linear actuator), are fixed at three locations at equal intervals along the circumference.

A piezoelectric element 1005 is attached to the fixed portion 1004, a drive shaft 1006 extends rearward from the piezoelectric element 1005, and a tilt adjusting cylinder 1007 is fitted to the drive shaft 1006.

The tilt adjusting cylinder 1007 moves in the optical axis OA direction (front and back) due to the vibration of the drive shaft 1006. A spherical portion 1008 is provided on the rear end surface of the tilt adjusting cylinder 1007.

Conical holes 1009 (top of FIG. 33), long V-grooves 1010 (bottom left of FIG. 33), and cylindrical holes 1011 (FIG. 33) are located at three locations on the front end surface of the centering lens holding frame 1002 facing the spherical portion 1008. (Lower right) are provided respectively.
Here, as shown in FIG. 33, the long V-groove 1010 is formed so that a straight line extending in the length direction of the long V-groove 1010 passes through the center of the conical hole 1009. Further, the diameter of the cylindrical hole 1011 is larger than the maximum diameter of the conical hole 1009.

Coil springs 1012 are attached at three locations in the circumferential direction between the rear end surface of the centering lens moving cylinder 1001 and the front end surface of the centering lens holding frame 1002. The centering lens holding frame 1002 is urged by the coil spring 1012 with respect to the centering lens moving cylinder 1001 in the direction of the optical axis OA via the spherical portion 1008 of the tilt adjusting cylinder 1007, the drive portion 1003, and the like.
As a result, the position of the centering lens holding frame 1002 in the shift direction on the plane orthogonal to the optical axis OA is determined.

The FPC 1013 extends from the outer periphery of the rear portion of the centering lens moving cylinder 1001, and the Hall elements 1014 are arranged at three places in the FPC 1013 at the same angle as the drive unit 1003.

Magnets 1015 are attached to the inside of the outer circumference of the centering lens holding frame 1002 at three places facing the hole element 1014 of the centering lens moving cylinder 1001, and the centering lens holding frame 1002 with respect to the centering lens moving cylinder 1001. The amount of movement in the optical axis OA direction is detected. As a result, the tilt amount of the centering lens holding frame 1002, that is, the centering lens L4 is calculated.

Since it is configured as described above, the tilt of the alignment lens holding frame 1002, that is, the alignment lens L4 with respect to the alignment lens moving cylinder 1001 is adjusted by moving the tilt adjustment cylinder 1007 back and forth in the optical axis OA direction. Can be done. This makes it possible to improve optical performance defects such as image plane asymmetry (one-sided blur).

Further, when the alignment lens holding frame 1002 is tilt-adjusted with respect to the alignment lens moving cylinder 1001, all the backlash of each engaging portion between the constituent members is canceled by the spring urging, so that shift and tilt can be performed. Highly accurate tilt adjustment is possible without rattling, and optical performance can be improved.

Further, if the three drive units 1003 are driven by the same amount, the position of the centering lens L4 in the optical axis OA direction can be adjusted, and the group spacing with the third lens group L3 can be adjusted, so that the spherical surface can be adjusted. Aberration, curvature of field, etc. can be adjusted.

When the purpose is only to adjust the tilt, one of the three drive units 1003 and the tilt adjustment cylinder 1007 is provided with a spherical portion 1016 on the rear end surface of the centering lens moving cylinder 1001 as shown in FIG. 34. It may be changed to be provided. In this case, it can be achieved by fixing the position of the centering lens holding frame 1002 in the optical axis OA direction and adjusting the other two positions.

Further, in FIG. 33, when the alignment lens holding frame 1002 is tilted and tilted by different driving amounts by the three driving units 1003, the positions of the contacts between the spherical portion 1008 and the alignment lens holding frame 1002 are Change.

At this time, the contact position of the spherical portion 1008 in the upper part of the drawing is fixed because the contact portion is the conical hole 1009. Since the contact portion of the lower left spherical portion 1008 is the long V-groove 1010 and extends toward the conical hole 1009, the contact position can be moved along the long V-groove 1010. Since the contact portion of the lower right spherical portion 1008 is the cylindrical hole 1011, the contact position can be moved within the cylindrical hole 1011.
Therefore, when the alignment lens holding frame 1002 is tilted and tilted by making the driving amounts of the three driving units 1003 different, the alignment lens holding frame 1002 is not excessively restrained by the spherical portion 1008.

When the centering lens holding frame 1002 is tilted, the magnet 1015 is also slightly tilted with respect to the Hall element 1014. The change in the interval of the magnet 1015 with respect to the Hall element 1014 due to this inclination affects the measurement of the movement amount of the magnet 1015, that is, the centering lens holding frame 1002 by the Hall element 1014. Therefore, it is preferable that the initial setting position of the Hall element 1014 with respect to the spherical portion 1008 coincides with the spherical center of the spherical portion 1008 in the optical axis OA direction.

Further, when the centering lens holding frame 1002 is tilted, the centering lens L4 is also tilted and the optical axis is slightly tilted, so that a shift occurs at the same time as the tilt. Therefore, when it is desired to make the shift of the centering lens L4 as small as possible, the initial setting position of the midpoint of the centering lens L4 or the point at which the shift is desired to be suppressed in the optical design also coincides with the sphere center of the spherical portion 1008 in the optical axis OA direction. It is preferable to leave it.

(11th Embodiment)
Next, the lens barrel of the eleventh embodiment will be described. FIG. 35 is a schematic cross-sectional view of the centering lens holding portion 1174 of the eleventh embodiment. FIG. 36 is a cross-sectional view taken along the line GG of FIG. 35 of the eleventh embodiment. It should be noted that FIG. 35 is a cross-sectional view of FIG. 36 in the a1-a2 direction. (B) of FIG. 36 is a cross-sectional view taken along the line b of (a).
It should be noted that FIG. 35 shows the relationship from a1 in FIG. 36 to a2 through the magnet 1115 in the upper part of FIG. 33, the Hall element 1114, the sphere portion 1108, the optical axis OA, the sphere portion 1108 in the lower left, and the coil spring 1110. It is a schematic cross-sectional view described as described above.

Drive units 1103, which are linear motors (linear actuators), are fixed to the centering lens moving cylinder 1101 at three locations at equal intervals along the circumference.

A piezoelectric element 1105 is attached to the fixed portion 1104 of the drive unit 1103, a drive shaft 1106 extends rearward from the piezoelectric element 1105, and a tilt adjusting cylinder 1107 is fitted to the drive shaft 1106.

The tilt adjusting cylinder 1107 moves in the optical axis OA direction (front and back) due to the vibration of the drive shaft 1106. A spherical portion 1108 is provided on the rear end surface of the tilt adjusting cylinder 1107. Long V-grooves 1109 are provided at three locations in the circumferential direction on the front end surface of the centering lens holding frame 1102.

The long V-groove 1109 extends in the direction toward the optical axis OA. Coil springs 1110 are provided at three locations in the circumferential direction between the rear end surface of the centering lens moving cylinder 1101 and the front end surface of the centering lens holding frame 1102. By the coil spring 1110, the centering lens holding frame 1102 is attached to the centering lens moving cylinder 1101 via a long V groove 1109, a spherical portion 1108 of the tilt adjusting cylinder 1107, a drive portion 1103, etc. in front of the optical axis OA direction. It is being pushed.
As a result, the shift direction position of the centering lens holding frame 1102 on the plane orthogonal to the optical axis OA is determined.

The FPC 1111 extends from the outer periphery of the rear portion of the centering lens moving cylinder 1101, and the Hall elements 1114 are arranged at three positions in the FPC 1111 at the same angle as the drive unit 1103.

On the inside of the outer circumference of the centering lens holding frame 1102, magnets 1115 are provided at three places facing the Hall element 1114 of the centering lens moving cylinder 1101, and the centering lens holding frame 1102 with respect to the centering lens moving cylinder 1101 is provided. The amount of movement in the optical axis OA direction is detected. As a result, the tilt amount of the centering lens holding frame 1102, that is, the centering lens L4 is calculated.

Also in the present embodiment, the tilt of the alignment lens holding frame 1102, that is, the alignment lens L4 with respect to the alignment lens moving cylinder 1101 can be adjusted by moving the tilt adjustment cylinder 1107 back and forth in the optical axis OA direction. This makes it possible to improve optical performance defects such as image plane asymmetry (one-sided blur).

Further, when the alignment lens holding frame 1102 is tilt-adjusted with respect to the alignment lens moving cylinder 1101, all the backlash of each engaging portion between the constituent members is canceled by the spring urging, so that the shift or tilt can be performed. Highly accurate tilt adjustment is possible without rattling, and optical performance can be improved.

Further, by adjusting the movement of the three points by the same amount, the position of the centering lens L4 in the optical axis OA direction can be adjusted, and the group spacing with the third lens group L3 can be adjusted, so that spherical aberration and image plane can be adjusted. It is possible to adjust the curvature and the like.

FIG. 37 is a modified example of the eleventh embodiment. When the purpose is only to adjust the tilt, one of the three drive units 1103 and the tilt adjustment cylinder 1107 is abolished, and as shown in FIG. 37, the spherical portion 1108'is attached to the rear end surface of the centering lens moving cylinder 1101. This can be achieved by fixing the position of the centering lens holding frame 1102 in the optical axis OA direction and adjusting the other two locations.

According to the present embodiment, the tilt adjusting cylinder 1107 of the drive unit 1103 provided in the centering lens moving cylinder 1101 and the angular position in the circumferential direction of the long V groove 1109 provided in the centering lens holding frame 1102 are respectively. If it is divided into 120 ° equal parts, the alignment of the centering lens holding frame 1102 with respect to the centering lens moving cylinder 1101 in the angular direction can be freely set every 120 °. This eliminates the need for angular alignment during assembly and prevents assembly errors.

Further, the positions of the three drive units 1103 provided on the centering lens moving cylinder 1101 and the positions in the angular direction and the radial direction of the three long V-grooves 1109 provided on the centering lens holding frame 1102 are set. It may vary depending on the processing accuracy.
As a result, the shift accuracy of the surface orthogonal to the optical axis OA of the centering lens holding frame 1102, that is, the centering lens L4, with respect to the centering lens moving cylinder 1101 varies.
However, as a result, it is possible to assemble at the combination position with the best shift accuracy from the three options of combination, or at the combination position where the best optical performance can be obtained by looking at the optical balance with the first to third lens groups on the front side. It can be assembled.
Further, since the shape of the front end surface of the centering lens holding frame 1102 is only three places in the long V groove, it is possible to reduce the man-hours for processing parts.

In FIG. 37, when the drive unit 1103 directly above is driven and the tilt adjusting cylinder 1107 moves in the optical axis direction, the centering lens holding frame 1102 tilts. At this time, the centering lens holding frame 1102 is placed on the lower side 2. It rotates around the sphere center of the sphere portion 1108 of the tilt adjustment cylinder 1107 at the location.

When the centering lens holding frame 1102 rotates, the magnet 1115 directly above rotates with respect to the Hall element 1114, so that the magnet 1115 tilts slightly with respect to the Hall element 1114.
The change in the interval of the magnet 1115 with respect to the Hall element 1114 due to this inclination affects the measurement of the movement amount of the magnet 1115, that is, the centering lens holding frame 1102 by the Hall element 1114, and therefore the initial stage of the Hall element 1114 with respect to the spherical portion 1108. It is preferable that the set position coincides with the sphere center of the sphere portion 1108 in the direction of the optical axis OA.

At the same time, the optical axis of the centering lens L4 is slightly tilted due to rotation, so that a shift occurs at the same time as the tilt.
Therefore, when it is desired to minimize the shift of the centering lens L4, the initial setting position of the midpoint of the centering lens L4 or the point at which the shift is desired to be suppressed in the optical design also coincides with the sphere center of the spherical portion 1108 in the optical axis OA direction. It is preferable to let it.

(12th Embodiment)
Next, the lens barrel of the twelfth embodiment will be described. FIG. 38 is a schematic cross-sectional view of the centering lens holding portion 1274 of the twelfth embodiment. FIG. 39 is a sectional view taken along the line HH of FIG. 38 of the twelfth embodiment. FIG. 40 is a front view of the annular leaf spring 1208.

In the centering lens moving cylinder 1201, for example, fixed portions 1204 of the drive unit 1203, which is a linear actuator, are fixed at three locations at equal intervals along the circumference. A piezoelectric element 1205 is attached to the fixed portion 1204, and a drive shaft 1206 extends from the piezoelectric element 1205 toward the body in the optical axis OA direction.

Circular leaf springs 1208 are attached to the front end surface of the centering lens holding frame 1202 by tilt adjusting cylinders 1207 at three locations in the circumferential direction.
This assembly is attached to the centering lens moving cylinder 1201 from the right side of FIG. 38. At this time, the tilt adjusting cylinder 1207 is fitted to the drive shaft 1206 of the drive unit 1203 at three points at the same time, and then the screw portion 1215. Fix with.

As a result, the shift direction position of the alignment lens holding frame 1202, that is, the alignment lens L4 on the plane orthogonal to the optical axis OA is determined with respect to the alignment lens moving cylinder 1201.
Further, when the tilt adjusting cylinder 1207 moves in the direction of the optical axis OA due to the vibration of the drive shaft 1206, the annular leaf spring 1208 bends, and the centering lens holding frame 1202, that is, the centering lens L4 tilts with respect to the optical axis OA.

The FPC 1209 is arranged on the outer periphery of the rear portion of the centering lens moving cylinder 1201, and the Hall elements 1210 are arranged at three places in the FPC 1209 at the same angle as the drive unit 1203.

On the inside of the outer circumference of the centering lens holding frame 1202, magnets 1211 are attached at three places facing the Hall element 1210 of the centering lens moving cylinder 1201, and the centering lens holding frame 1202 with respect to the centering lens moving cylinder 1201 is attached. The amount of movement in the optical axis OA direction is detected. As a result, the tilt amount of the centering lens holding frame 1202, that is, the centering lens L4 is calculated.

Since it is configured as described above, the tilt of the alignment lens holding frame 1202, that is, the alignment lens L4 with respect to the alignment lens moving cylinder 1201 is adjusted by moving the tilt adjustment cylinder 1207 back and forth in the optical axis OA direction. Can be done. This makes it possible to improve optical performance defects such as image plane asymmetry (one-sided blur).

Further, when the alignment lens holding frame 1202 is tilt-adjusted with respect to the alignment lens moving cylinder 1201, the alignment lens holding frame 1202 is not shifted in the direction orthogonal to the optical axis OA, and the engagement portions between the constituent members are rattled. Since there is no such thing, it is possible to perform highly accurate tilt adjustment without causing backlash in shift or tilt, and it is possible to improve optical performance.

In the present embodiment, the centering lens moving cylinder 1201 is provided with the fixing portion 1204 of the drive unit 1203, the piezoelectric element 1205 and the drive shaft 1206, and the centering lens holding frame 1202 is provided with the tilt adjusting cylinder 1207 to form a ring plate spring 1208. It was configured to attach the assembly to which was attached.
However, not limited to this, the drive unit 1203 also has the drive shaft 1206 inserted into the tilt adjustment cylinder 1207 on the component side, and is attached to the centering lens moving cylinder 1201 with the screw portion in the assembled state, and then adjusted. The drive unit 1203 may be fixed to the core lens moving cylinder 1201 by an appropriate method.

In FIG. 39, when the upper drive unit 1203 is driven to move the tilt adjusting cylinder 1207 in the optical axis direction and the centering lens holding frame 1202 is tilted, the magnet 1211 is slightly tilted with respect to the Hall element 1210. The change in the interval of the magnet 1211 with respect to the Hall element 1210 due to this inclination affects the measurement of the amount of movement of the magnet 1211, that is, the centering lens holding frame 1202 by the Hall element 1210. Therefore, it is preferable that the initial setting position of the Hall element 1210 with respect to the thickness center of the annular leaf spring 1208 in the optical axis OA direction coincides with the thickness center of the annular leaf spring 1208 in the optical axis OA direction.

At the same time, it is preferable that the midpoint of the centering lens L4 or the initial setting position of the point desired to be the rotation center of the tilt in the optical design also coincides with the thickness center of the annular leaf spring 1208 in the optical axis OA direction.

The annular leaf spring 1208 does not necessarily have to have an annular shape, and as in the annular leaf spring 1208'in FIG. 40, from the attachment portion of the alignment lens moving cylinder 1201 to the attachment portion to the alignment lens holding frame 1202. The width may be gradually changed toward.

In this way, when the tilt adjusting cylinder 1207 moves in the optical axis OA direction due to the vibration of the drive shaft 1206 and bends the annular leaf spring 1208', the drive load of the drive unit 1203 can be reduced and the current consumption can be reduced. Can be reduced.

In addition, the present invention is not limited to the above-described embodiment or modification, and may be configured in any combination.

L4: Alignment lens 2: Lens lens barrel, 101: Alignment lens moving cylinder, 101a: Opposing frame, 101b: Camfollow connecting cylinder, 101c: Subject side surface, 102: Aligning lens holding frame, 103, 103a, 103b: Drive unit, 104: lead screw, 105: drive unit mounting frame, 106, 111, 112: FPC, 107: hole element, 108: coil spring, 109: magnet, 110: electromagnetic drive diaphragm, 115: engaging slot ( Engagement unit), 120: Lens substrate, 120a: Control unit, 120b: Alignment amount storage unit, 132: Protrusion unit, 150: Position detection unit, 160: Moving frame, 161: Alignment pin (alignment member), 161c: Fixed pin, 162: Washer, 163: Ball, 164: Recess, 165: Movement restriction pin,

401: Alignment lens moving cylinder, 401a: Opposing frame, 401d: Drive unit holding recess, 401e: Through hole, 402: Alignment lens holding frame, 402a: Projection, 403: Drive unit, 404: Lead screw, 405 : Tilt adjustment nut (alignment member), 405a: contact portion, 407: Hall element, 409: magnet, 450: position detection unit, 474: alignment lens holding portion,

501e: Through hole, 503: Drive part, 503a: Fixed part, 503b: Piezoelectric element, 504: Drive shaft, 505: Tilt adjustment cylinder (alignment member), 574: Alignment lens holding part, 601a: Facing frame, 601d : Drive unit holding recess,

601a: Facing frame, 601e: Through hole, 602: Alignment lens holding frame, 603: Drive unit, 604: Lead screw, 605: Tilt adjustment nut (alignment member), 605a: Tip part, 607: Hall element, 608 : Ball (alignment member), 609: Coil spring, 615: Engagement slot, 653: Drive unit, 654: Lead screw, 659: Magnet, 660: Moving piece, 661a, 661b: Alignment pin, 661c: Fixed Pin, 674: Alignment lens holder,

701: Alignment lens moving cylinder, 702: Alignment lens holding frame, 703: Drive unit, 703a: Drive unit mounting frame, 704: Lead screw, 705: Shift adjustment nut, 706: Thread part, 707: Opening, 708 : Conical hole, 709: Ball, 710: Long V-groove, 711: Conical hole, 774: Centering lens holder,

802: Alignment lens holding frame, 803ac: Frame side end plate, 804: Reed screw, 809: Ball, 810: Long V groove, 816: Shift adjustment nut, 817: Threaded part, 818: Opening, 819: Conical hole , 820: Slit,

901: Alignment lens moving cylinder, 902: Alignment lens holding frame, 903: Drive unit, 903a: Drive unit mounting frame, 904: Lead screw, 905: Shift adjustment nut, 906: Thread part, 907: Opening, 908 , 909: Sphere, 910: Groove, 912: Coil spring, 914: Hall element, 915: Magnet, 974: Alignment lens holder,

1001: Alignment lens moving cylinder, 1002: Alignment lens holding frame, 1003: Drive unit, 1004: Fixed part, 1005: Piezoelectric element, 1006: Drive shaft, 1007: Tilt adjustment cylinder, 1108: Sphere part, 1009: Conical Hole, 1010: Groove, 1011: Cylindrical hole, 1012: Coil spring, 1014: Hall element, 1015: Magnet, 1016: Sphere part, 1074: Alignment lens holding part,

1101: Alignment lens moving cylinder 1102: Alignment lens holding frame 1103: Drive unit, 1104: Fixed unit, 1105: Piezoelectric element, 1106: Drive shaft, 1107: Tilt adjustment cylinder, 1108: Sphere unit, 1109: Length V-groove, 1110: Coil spring, 1115: Hall element, 1115: Magnet, 1174: Alignment lens holder,

1201: Alignment lens moving cylinder 1202: Alignment lens holding frame 1203: Drive unit 1204: Fixed unit 1205: Piezoelectric element, 1206: Drive shaft, 1207: Tilt adjustment cylinder, 1208: Ring leaf spring, 1210 : Hall element, 1211: Magnet, 1274: Centering lens holder

Claims (12)

A lens holding frame that holds the lens and
A first frame different from the lens holding frame and
A drive unit provided in either the first frame or the lens holding frame and changing the inclination of the lens holding frame with respect to the first frame.
Lens barrel with. A lens holding frame that holds the lens and
A first frame different from the lens holding frame and
A drive unit provided in either the first frame or the lens holding frame and driving a part of the lens holding frame in a direction away from the first frame.
Lens barrel with. The lens barrel according to claim 1 or 2, wherein the first frame is arranged so as to face the lens holding frame in the optical axis direction. The drive unit includes a power unit and a moving unit, and includes a power unit and a moving unit.
The lens barrel according to any one of claims 1 to 3, wherein the moving unit is moved in the optical axis direction by the power unit. The lens barrel according to claim 4, wherein the moving portion pushes the lens holding frame in the optical axis direction. The drive unit is provided in the first frame.
The lens barrel according to claim 4 or 5, wherein the moving portion is arranged between the power unit and the lens holding frame. The lens barrel according to any one of claims 1 to 6, further comprising an elastic member arranged between the lens holding frame and the first frame. The lens barrel according to claim 7, wherein the elastic member generates a force in a direction in which the lens holding frame and the first frame approach each other. The lens barrel according to any one of claims 1 to 8, further comprising a detection unit for detecting the positional relationship between the lens holding frame and the first frame. The lens barrel according to any one of claims 1 to 9, wherein the drive unit is provided with at least two. The lens barrel according to any one of claims 1 to 10, wherein the driving unit is driven based on at least one of a position, a focal length, and a shooting distance of the lens in the optical axis direction. The lens barrel according to claim 11, further comprising a storage unit that stores information on the position, focal length, or shooting distance of the lens in the optical axis direction and information on the driving amount of the driving unit in association with each other.

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