JP2007079206A - Lens barrel and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel advantageous in terms of miniaturization, and an imaging apparatus. <P>SOLUTION: A female screw member 48 is coupled with a movable lens frame 34 so as not to move in an optical axis direction and so as to rotate around a virtual axis parallel with the optical axis, and has a female screw part 4802 in which a male screw member 40 is screwed. The center of rotation where the female screw member 48 is rotatably coupled with the movable lens frame 34 is positioned within the contour of the cross section of a main guide shaft 36 as seen from the optical axis direction. Therefore, the occupancy space of the female screw member 48 in a direction orthogonal to the optical axis is reduced while securing the center of rotation of the female screw member 48 inside the lens barrel 16. Thus, the dimension of the lens barrel 16 in the direction orthogonal to the optical axis can be reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lens barrel and an imaging device.

An imaging apparatus such as a digital still camera or a digital video camera is provided with a lens barrel.
As a lens barrel, a lens barrel, an image sensor provided inside the lens barrel, a movable lens provided inside the lens barrel, a movable lens frame holding the movable lens, and an optical axis of the movable lens A guide shaft is provided that extends in the direction of movement and engages with the movable lens frame to guide the movable lens frame so that the movable lens frame can move in the optical axis direction, and driving means for moving the movable lens frame. .
In this type of driving means, a male screw member that extends in parallel with the optical axis and is driven to rotate inside the lens barrel, and a movable lens frame that is immovably coupled in the optical axis direction and is screwed to the male screw member. An internal thread member having an internal thread is used.
Then, the female screw member can be rotated around the virtual axis parallel to the optical axis to the movable lens frame so that the movable lens frame can be moved smoothly even if a rotational moment acts on the female screw member by the rotation of the male screw member. There has been proposed a combination with the above (see Patent Document 1).
JP 2001-183565 A

By the way, in recent years, in order to reduce the size of an imaging apparatus having such a lens barrel, it has been required to reduce the size of the lens barrel, particularly to reduce the dimension in the direction perpendicular to the optical axis of the lens barrel. Yes.
However, as described above, in the case where the female screw member is coupled to the movable lens frame so as to be rotatable around a virtual axis parallel to the optical axis, the guide shaft and the female screw member are rotatably coupled to the movable lens frame. It is necessary to secure the distance from the location and the location between the location where the female screw member is rotatably coupled to the movable lens frame and the male screw member inside the lens barrel, reducing the occupied space in the direction perpendicular to the optical axis. There is a disadvantage in reducing the size of the lens barrel.
Therefore, how to reduce the space occupied by the female screw member in the direction orthogonal to the optical axis has become important.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a lens barrel and an imaging apparatus that are advantageous in reducing the size.

In order to achieve the above-described object, the present invention provides a lens barrel, an imaging device provided inside the lens barrel, a movable lens provided inside the lens barrel, and a movable lens that holds the movable lens. A guide shaft that extends in a direction parallel to the optical axis of the movable lens inside the barrel and engages the movable lens frame so as to move the movable lens frame in the optical axis direction. A male screw member extending in parallel with the guide shaft at an interval in a direction orthogonal to the extending direction of the guide shaft inside the lens barrel, a drive source for rotationally driving the male screw member, A lens barrel comprising: a movable lens frame; a female screw member having a female screw portion that is coupled to the movable lens frame so as not to move in the optical axis direction and to be rotatable around a virtual axis parallel to the optical axis and to which the male screw member is screwed. The female screw member is movable Rotatably coupled center of rotation's frame, as viewed from the optical axis direction, and being located in a section of the contour of the guide shaft.
In addition, the present invention provides a lens barrel, an imaging device provided inside the lens barrel, a movable lens provided inside the lens barrel, a movable lens frame that holds the movable lens, and the lens barrel A guide shaft that extends in a direction parallel to the optical axis of the movable lens and engages the movable lens frame to guide the movable lens frame so as to be movable in the optical axis direction. A male screw member extending in parallel with the guide shaft at an interval in a direction orthogonal to the extending direction of the guide shaft, a drive source for rotationally driving the male screw member, and the light on the movable lens frame An imaging apparatus having a lens barrel including a female screw member having a female screw portion that is coupled to be rotatable about a virtual axis that is immovable in an axial direction and parallel to the optical axis, and has a female screw portion that is screwed to the male screw member. The internal thread member is the movable lens Rotatably coupled center of rotation, viewed from the optical axis direction, and being located in a section of the contour of the guide shaft.

  According to the present invention, since the rotation center in which the female screw member is rotatably coupled to the movable lens frame is located within the outline of the cross section of the guide shaft when viewed from the optical axis direction, the rotation center of the female screw member is determined. The space occupied by the female screw member in the direction orthogonal to the optical axis can be reduced while securing the inside of the lens barrel. Therefore, the dimension of the lens barrel in the direction orthogonal to the optical axis can be reduced, which is advantageous in reducing the size of the lens barrel and the imaging device.

(First embodiment)
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of the imaging apparatus 10 according to the present embodiment as viewed from the front, and FIG.
As shown in FIG. 1, in the present embodiment, the imaging device 10 is a video camera, and has a case 12 that constitutes an exterior. The case 12 has a width in the left-right direction and front and rear dimensions larger than this width. It has a length in the direction and a height in the vertical direction that is larger than this length.
In the present specification, left and right refer to the state in which the imaging device 10 is viewed from the front, the subject side is referred to as the front, and the opposite side is referred to as the rear.
A lens barrel 14 according to the present invention is incorporated in the upper part of the front surface 12A of the case 12.
As shown in FIG. 2, the lens barrel 14 includes a lens barrel 16, an objective lens 18 incorporated at the front end of the lens barrel 16, an imaging device 20 provided at the rear end of the lens barrel 16, and the lens barrel 16. A plurality of lenses including a movable lens 22 that is disposed behind the objective lens 18 and guides an object image captured by the objective lens 18 to the imaging device 20 are included. The objective lens 18, the movable lens 22, and the plurality of lenses are arranged. A photographing optical system 24 is configured by the lens.
As will be described later, the movable lens 22 functions as a focusing lens that performs a focusing operation in cooperation with other lenses by moving in the optical axis direction, or a zooming lens that performs a zooming operation. is there.

As shown in FIG. 1, the lens barrel 14 is incorporated in the case 12 so that the objective lens 18 is positioned inside a decorative ring 1202 on the upper surface 12 </ b> A of the case 12.
As shown in FIG. 1, on the left side 12C side in the case 12, a still image and moving image data of a subject image captured by the image sensor 20 is recorded on a recording medium (for example, magnetic tape, optical disk, magneto-optical disk, etc.). A recording / reproducing unit 26 for recording / reproducing is provided.
On the right side surface 12D of the case 12, a display device 28 for displaying a subject image captured by the image sensor 20 is provided so as to be openable and closable.
The rear surface 12B and the left side surface 12C of the case 12 are provided with an operation switch 30A (see FIG. 2) such as a shooting start / stop switch and a plurality of setting switches 30B (see FIG. 2) for performing various settings.
A viewfinder device 32 for visually recognizing a subject image picked up by the image pickup device 20 is incorporated in the upper part of the rear surface 12B of the case 12.

As shown in FIG. 2, the image pickup device 20 is configured by a CCD, a CMOS sensor, or the like that picks up a subject image formed by the photographing optical system 24.
The image picked up by the image pickup device 20 is output as an image pickup signal to the image processing unit 1002, and the image processing unit 1002 generates still image data or moving image image data based on the image pickup signal, and the recording / reproducing unit 26 uses the storage medium In addition, the image data is reproduced from the recording medium by the recording / reproducing unit 26.
The image data is displayed on the display 28 and the viewfinder device 32 by the display processing unit 1004.
Furthermore, the imaging apparatus 10 includes a control unit 11006 including a CPU that controls the image processing unit 1002, the display processing unit 1004, and the like according to the operation of the operation switch 30A and the setting switch 30B.

3 and 4 are perspective views of the lens barrel 14, and FIGS. 5 and 6 are explanatory diagrams showing the internal configuration of the lens barrel 14.
As shown in FIG. 3, the lens barrel 16 has four side walls 1602 having a substantially rectangular frame shape in a cross section perpendicular to the axis thereof, and a front end 1604 of the lens barrel 16 via a cylindrical holding frame. Then, the objective lens 18 (FIG. 1) is assembled, and the image sensor 20 is assembled to the rear end 1606 of the lens barrel 16.
A substantially rectangular opening 1608 extending in the front-rear direction is formed in one of the four side walls 1602.

As shown in FIGS. 5 and 6, the lens barrel 16 includes a movable lens 22, a movable lens frame 34 that holds the movable lens 22, a main guide shaft 36 and a sub guide shaft 38, and a male screw member 40. A drive source 44, a holder 46, and a female screw member 48 are provided.
The main guide shaft 36 and the sub guide shaft 38 are disposed so as to be spaced in the direction orthogonal to the optical axis of the movable lens 22 and to extend in a direction parallel to the optical axis of the movable lens 22. It is attached to the wall 1602 and the rear wall 1604.
The movable lens frame 34 has a plate-shaped main body 3402, and the movable lens 22 is incorporated and held in an opening formed in the center of the main body 3402.
In the movable lens frame 34, a bearing portion 3404 provided on one side of the main body 3402 is slidably coupled to the main guide shaft 36, and an engaging portion 3406 provided on the other side of the main body 3402 has a sub guide shaft. By being slidably coupled to 38, the movable lens 22 is guided so as to be movable in the optical axis direction and in a state in which the rotation around the main guide shaft 36 is prevented.

7A is a cross-sectional view taken along line AA in FIG. 6, and FIG. 7B is a cross-sectional view taken along line BB in FIG.
More specifically, as shown in FIG. 7A, the bearing portion 3404 is formed to extend from the main body 3402 in a cylindrical shape rearward.
Bearing holes 3412 and 3414 are provided on the same axis parallel to the optical axis of the movable lens 22 in the front wall 3408 and the rear wall 3410 provided at the front end and the rear end of the bearing portion 3404, respectively. The main guide shaft 36 is inserted into the main guide shaft 36 so that the bearing portion 3404 is slidably coupled to the main guide shaft 36.
An intermediate wall 3416 is provided at an intermediate position between the front wall 3408 and the rear wall 3410 of the bearing portion 3404.
An inner peripheral surface 3420 is formed at a location where the front wall 3408 faces the intermediate wall 3416 and is coaxial with the bearing hole 3412 and has an inner diameter larger than that of the bearing hole 3412.
An inner peripheral surface 3422 is formed on the intermediate wall 3416 with an inner diameter that is coaxial with the bearing hole 3412 and larger than that of the bearing hole 3412.
In addition, a notch 3424 for inserting a part of the female screw member 48 is provided at a bearing portion 3404 located between the front wall 3408 and the intermediate wall 3416.

FIG. 9 is a perspective view of the movable lens frame 34 and the holder 46.
As shown in FIG. 9, the holder 46 is a member for disposing the male screw member 40 and the drive source 44.
The holder 46 has a main body plate portion 4602 formed in a strip shape, and a front bent piece 4604 and a rear bent piece 4606 which are bent from both ends in the longitudinal direction of the main body plate portion 4602.
Both ends of the male screw member 40 are rotatably supported by the front bent piece 4604 and the rear bent piece 4606 of the holder 46.
The drive source 44 is constituted by a motor, and the output shaft is attached to the rear bent piece 4606 of the holder 46 in a state where the output shaft is coupled to the male screw member 40, so that the male screw member 40 is rotationally driven. The drive signal is supplied to the drive source 44 by a driver circuit (not shown) connected to the control unit 1006.
As shown in FIG. 4, the holder 46 closes the opening 1608 with the main body 4602 in a state where the male screw member 40 and the drive source 44 are assembled and the longitudinal direction thereof is parallel to the optical axis of the movable lens 22. It is attached to the lens barrel 16.
Thereby, the male screw member 40 extends in parallel with the main guide shaft 36 at an interval in the direction perpendicular to the extending direction of the main guide shaft 36 inside the lens barrel 16.

As shown in FIG. 9, the female screw member 48 is coupled to the movable lens frame 34 so as not to move in the optical axis direction and to be rotatable around a virtual axis parallel to the optical axis, and the male screw member 40 is screwed together. An internal thread portion 4802 is provided.
8A and 8B are perspective views of the female screw member 48. FIG.
More specifically, as shown in FIGS. 8A and 8B, the female screw member 48 has two cylindrical portions 4804 spaced apart in the optical axis direction.
Each cylindrical portion 4804 is formed with an inner peripheral surface 4806 formed with an inner diameter that is larger than the outer peripheral surface of the main guide shaft 36, and with a size that is coaxial with the inner peripheral surface 4806 and larger than the inner peripheral surface 4806. And an outer peripheral surface 4808.
As shown in FIG. 7, each cylindrical portion 4804 of the female screw member 48 is inserted into the bearing portion 3404 from the notch 3424, and the outer peripheral surface 4808 of each cylindrical portion 4804 and each inner peripheral surface 3420 of the movable lens frame 34. , 3422 are coupled to each other so that the female screw member 48 is rotatably coupled to the movable lens frame 34.
Accordingly, the female screw member 48 is coupled to the movable lens frame 34 so as to be rotatable about the axis of the inner peripheral surfaces 3420 and 3422, that is, the axis of the main guide shaft 36 as the rotation center O1.
Further, as shown in FIG. 7, in the state where the female screw member 48 is rotatably coupled to the movable lens frame 34, the main guide shaft 36 has the bearing holes 3412 and 3414 of the bearing portion 3404 and the inner peripheral surfaces of the female screw member 48. 4806 is inserted.
In this state, the outer peripheral surface of the main guide shaft 36 and the bearing holes 3412 and 3414 are in sliding contact with each other, but the inner peripheral surface 4806 is formed with an inner diameter having a larger dimension than the outer peripheral surface of the main guide shaft 36. An annular gap is formed between the outer peripheral surface of the guide shaft 36 and each inner peripheral surface 4806 so as not to contact each other.

The rotation center at which the female screw member 48 is rotatably coupled to the movable lens frame 34 is located within the contour of the cross section of the main guide shaft 36 when viewed from the optical axis direction. In the present embodiment, the female screw member 48 is provided. The rotation center O1 rotatably coupled to the movable lens frame 34 and the axis of the main guide shaft 36 coincide with each other.
Further, the female screw member 48 has leg portions 4810 that sandwich the male screw member 40 in the radial direction at locations away from the axial center of each cylindrical portion 4804. These leg portions 4810 project from the longitudinal direction of the male screw member 40 with a phase shifted, and the female screw portion 4802 is formed of a ridge 4812 that is formed inside each leg portion 4810 and engages with the outer periphery of the male screw member 40. Has been.
A spring portion 4814 is provided so as to face one of the female screw portions 4802. By pressing the spring portion 4814 against the male screw member 40, the male screw member 40 is urged to mesh with the one female screw portion 4802. ing.
The female screw member 48 is made of synthetic resin, and the leg portion 4810 and the spring portion 4814 are elastically deformable.

When the holder 46 in which the male screw member 40 and the drive source 44 are assembled is assembled into the opening 1608 of the lens barrel 16, the two legs 4810 face outward through the opening 1608, as shown in FIG. The female screw member 48 is rotated around a virtual axis parallel to the optical axis.
In this state, as shown in FIG. 4, the male screw member 40 is pushed and spread between the two leg portions 4810 so that the male screw member 40 is located between the two leg portions 4810. insert.
When the two leg portions 4810 of the female screw member 48 are in a state of sandwiching the male screw member 40, the holder 46 is pushed in so that the male screw member 40 is located inward of the lens barrel 16, whereby the female screw member 48 is The rotation is performed around a virtual axis parallel to the optical axis, and the two legs 4810 are moved to a position rotated 90 degrees from the position facing the opening 1608.
FIG. 10 is a view of this state when the lens barrel 14 is viewed from the optical axis direction.
Thereby, as shown in FIG. 10, the two legs 4810 of the female screw member 48 are accommodated inside the side wall 1602 of the lens barrel 16, and the extending directions of the two legs 4810 are parallel to each other.
In this state, by attaching the main body 4602 of the holder 46 to the opening 1608 with a screw or the like, the assembly of the holder 46 in which the male screw member 40 and the drive source 44 are assembled to the lens barrel 16 is completed.

Next, the operation will be described.
When the drive signal is supplied to the drive source 44 by the control of the control unit 1006 and the drive source 44 operates to rotate the male screw member 40 in the forward and reverse directions, the female screw member 48 is moved to the main guide shaft 36 and the sub guide shaft 38. Accordingly, the movable lens frame 34 moves integrally with the female screw member 48 in the optical axis direction.
At this time, even if a rotational moment acts on the female screw member 48 because the male screw member 40 swings in a direction orthogonal to the longitudinal direction as the male screw member 40 rotates, the female screw member 48 follows the movement of the male screw member 40. Thus, it swings around an imaginary axis parallel to the optical axis (in this embodiment, it swings around the axis of the main guide shaft 36).
Therefore, the movable lens frame 34 can smoothly move along the optical axis without an excessive force acting on the movable lens frame 34 in a direction orthogonal to the optical axis from the female screw member 48.

According to the present embodiment, the rotation center O1 in which the female screw member 48 is rotatably coupled to the movable lens frame 34 is located within the contour of the cross section of the main guide shaft 36 when viewed from the optical axis direction.
Therefore, the space occupied by the female screw member 48 in the direction orthogonal to the optical axis can be reduced while securing the rotation center O1 of the female screw member 48 inside the lens barrel 16.
A detailed description will be given with reference to a comparative example. In a comparative example in which the present invention is not adopted, as shown in FIG. 11, a main guide shaft 36 and a female screw member 48 can rotate around the movable lens frame 34 inside the lens barrel 16. It is necessary to secure the distance L1 of the portion 4820 to be coupled to the movable lens frame 34 and the distance L2 between the portion 4820 to which the female screw member 48 is rotatably coupled to the movable lens frame 34 and the male screw member 40.
On the other hand, in the present embodiment, as shown in FIG. 10, the distance L1 between the main guide shaft 36 and the portion 4820 (rotation center O1) where the female screw member 48 is rotatably coupled to the movable lens frame 34 is set as the main. It is possible to reduce the radius to be less than or equal to the radius of the guide shaft 36, and it is possible to greatly reduce the sum of the distance L1 and the distance L2.
Further, as in the embodiment, when the female screw member 48 matches the rotation center O1 rotatably coupled to the movable lens frame 34 and the axis of the main guide shaft 36, the distance L1 is set to zero. This is advantageous in reducing the total sum of the distance L1 and the distance L2.
Therefore, the dimension of the lens barrel 14 in the direction orthogonal to the optical axis can be reduced, which is advantageous in reducing the size of the lens barrel 14 and the imaging device 10.
For example, the dimension in the direction orthogonal to the optical axis of the lens barrel 14 can be reduced by the space shown by hatching in FIG.

In the present embodiment, the case where the rotation center of the female screw member 48 rotatably coupled to the movable lens frame 34 is matched with the axis of the main guide shaft 36 has been described. However, the female screw member 48 is movable lens. When the center of the inner peripheral surface 3420, 3422 is shifted from the center of the bearing hole 3412, 3414 with respect to the center of rotation rotatably coupled to the frame 34, the main guide shaft 36 The distance L1 between the main guide shaft 36 and the portion 4820 where the female screw member 48 is rotatably coupled to the movable lens frame 34 is reduced to be equal to or less than the radius of the main guide shaft 36. The total sum of the distance L1 and the distance L2 can be greatly shortened, and the female screw in the direction perpendicular to the optical axis is secured while the rotation center of the female screw member 48 is secured inside the lens barrel 16. Which is advantageous in reducing the space occupied by the member 48.
In the present embodiment, the case where the inner peripheral surface 4806 of each cylindrical portion 4804 of the female screw portion 48 is not in contact with the outer peripheral surface of the main guide shaft 36 has been described. The inner peripheral surface 4806 may be rotatably coupled, and the female screw member 48 and the movable lens frame 34 may be coupled so as not to move in the optical axis direction. However, the configuration as in the embodiment is advantageous for smoothly moving the movable lens frame 34 along the optical axis.

Further, in the embodiment, the case where the lens barrel 16 is incorporated in the case 12 of the imaging device 10 has been described. However, the lens barrel 16 is incorporated in the exterior (front) of the case 12 so as to be able to appear and retract. In addition, it is a so-called collapsible lens barrel and the present invention can of course be applied.
Moreover, the structure of the female screw member 48 screwed into the male screw member 40 may be a screw hole, and various conventionally known structures can be applied to the female screw member 48.
In the embodiments, the case where the imaging device is a digital video camera has been described. However, the present invention is not limited to various imaging devices such as a digital still camera, a mobile phone with a camera, or a PDA (Personal Digital with a camera). Assistants), notebook personal computers with cameras, and the like.

It is the perspective view which looked at the imaging device 10 of this Embodiment from the front. 3 is a block diagram illustrating a configuration of a control system of the imaging apparatus 10. FIG. 2 is a perspective view of a lens barrel 14. FIG. 2 is a perspective view of a lens barrel 14. FIG. 3 is an explanatory diagram showing an internal configuration of a lens barrel 14. FIG. 3 is an explanatory diagram showing an internal configuration of a lens barrel 14. FIG. (A) is the sectional view on the AA line of FIG. 6, (B) is the sectional view on the BB line of (A). (A), (B) is a perspective view of the internal thread member 48. FIG. 3 is a perspective view of a movable lens frame 34 and a holder 46. FIG. It is the figure which looked at the lens barrel 14 from the optical axis direction. It is the figure which looked at the lens barrel 14 of the comparative example from the optical axis direction.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Imaging device, 14 ... Lens barrel, 16 ... Lens barrel, 20 ... Imaging element, 22 ... Movable lens, 34 ... Movable lens frame, 36 ... Main guide shaft, 40 ... Male screw member , 44... Drive source, 48... Female screw member, 4802.

Claims (5)

A lens barrel,
An image sensor provided inside the lens barrel;
A movable lens provided inside the lens barrel;
A movable lens frame for holding the movable lens;
A guide shaft that extends in a direction parallel to the optical axis of the movable lens inside the barrel and engages the movable lens frame to guide the movable lens frame so as to be movable in the optical axis direction;
A male screw member extending in parallel with the guide shaft at an interval in a direction orthogonal to the extending direction of the guide shaft inside the barrel;
A drive source for rotationally driving the male screw member;
A lens barrel comprising a female screw member having a female screw portion that is coupled to the movable lens frame so as not to move in the optical axis direction and is rotatable about a virtual axis parallel to the optical axis and to which the male screw member is screwed. Because
A rotation center in which the female screw member is rotatably coupled to the movable lens frame is located within a contour of a cross section of the guide shaft as viewed from the optical axis direction.
A lens barrel characterized by that.   2. The lens barrel according to claim 1, wherein a rotation center of the female screw member rotatably coupled to the movable lens frame coincides with an axis of the guide shaft. The female screw member has a cylindrical portion,
The cylindrical portion includes an inner peripheral surface formed with an inner diameter larger than the outer peripheral surface of the guide shaft, and an outer peripheral surface formed coaxially with the inner peripheral surface and larger than the inner peripheral surface. Have
The movable lens frame has an inner peripheral surface that is rotatably coupled to the outer peripheral surface,
2. The female screw member is rotatably coupled to the movable lens frame by coupling the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the movable lens frame. Lens barrel. The female screw member has a plurality of cylindrical portions spaced in the optical axis direction,
Each cylindrical portion includes an inner peripheral surface formed with an inner diameter larger than the outer peripheral surface of the guide shaft, and an outer peripheral surface formed with a dimension larger than the inner peripheral surface on the same axis as the inner peripheral surface. And
The movable lens frame is formed with a plurality of inner peripheral surfaces that are rotatably coupled to the outer peripheral surfaces.
2. The female screw member is rotatably coupled to the movable lens frame by coupling the outer peripheral surface of each cylindrical portion and the inner peripheral surface of the movable lens frame. The lens barrel described. A lens barrel,
An image sensor provided inside the lens barrel;
A movable lens provided inside the lens barrel;
A movable lens frame for holding the movable lens;
A guide shaft that extends in a direction parallel to the optical axis of the movable lens inside the barrel and engages the movable lens frame to guide the movable lens frame so as to be movable in the optical axis direction;
A male screw member extending in parallel with the guide shaft at an interval in a direction orthogonal to the extending direction of the guide shaft inside the barrel;
A drive source for rotationally driving the male screw member;
A lens mirror comprising a female screw member having a female screw portion that is coupled to the movable lens frame so as to be immovable in the optical axis direction and is rotatable about a virtual axis parallel to the optical axis and to which the male screw member is screwed. An imaging device having a cylinder,
A rotation center in which the female screw member is rotatably coupled to the movable lens frame is located within a contour of a cross section of the guide shaft as viewed from the optical axis direction.
An imaging apparatus characterized by that.

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