JP6234089B2 - Lens barrel and imaging device - Google Patents

Description

  The present invention relates to a lens barrel including an optical element such as a lens and a photoelectric conversion element such as an imaging element, and an imaging apparatus such as a video camera and a digital still camera equipped with the lens barrel.

  Lens barrels mounted on cameras and interchangeable lenses include so-called pan focus lenses that do not have a focus drive function. The pan focus lens has a focus adjustment mechanism that relatively moves the lens and the image sensor in the optical axis direction in order to focus the lens on the image sensor surface. In addition, there is a lens unit in which an aperture unit for adjusting the amount of light is mounted on the pan focus lens.

  The lens barrel described in Patent Document 1 includes a focus ring whose thickness in the optical axis direction changes in the circumferential direction. The focus ring is provided in contact with the subject side of the lens frame unit and is rotatable around the optical axis. The lens frame unit is biased against the focus ring by a compression coil spring supported by the shutter base. That is, the lens frame unit is configured to be held in the optical axis direction by the main frame and the shutter base. When the focus ring is rotated, the lens frame unit moves in the optical axis direction with respect to the film surface, and focus adjustment is possible.

JP 2002-303776 A

However, in the configuration disclosed in Patent Document 1, since the support member for enabling the lens frame unit to move in the optical axis direction is two parts, the shutter base and the main frame, the number of parts is large, and the lens unit Cause an increase in size.
An object of the present invention is to reduce the number of parts and realize downsizing in a lens barrel equipped with a light amount adjusting unit.

In order to solve the above problems, an apparatus according to the present invention includes a lens holding member that holds an optical system including a lens, an imaging element, and guides the lens holding member along the optical axis direction of the optical system. Changing the relative positions of the sensor holding member and the lens holding member in the optical axis direction of the optical system, A focus adjusting ring disposed on the optical axis side of the optical system with respect to the actuator . The sensor holding member has an extending portion extending in a direction parallel to the optical axis of the optical system, and when a predetermined direction orthogonal to the optical axis of the optical system is a first direction, At least a part of the actuator and at least a part of the focus adjustment ring overlap each other, and the optical axis of the optical system passes through the predetermined cross section in a predetermined cross section orthogonal to the optical axis of the optical system. When the predetermined direction among the directions away from the second direction is the second direction and the direction opposite to the second direction is the third direction, at least a part of the extending portion is provided in the second direction, Although the extension portion is not provided in the third direction, at least a part of the actuator is provided.

  According to the present invention, it is possible to reduce the number of parts and achieve downsizing in a lens barrel equipped with a light amount adjusting unit.

1 is a perspective view of an imaging apparatus according to an embodiment of the present invention. It is a block diagram explaining the system configuration | structure of the imaging device of FIG. It is sectional drawing of the lens-barrel which concerns on embodiment of this invention. FIG. 4 is an exploded perspective view of the lens barrel in FIG. 3. FIG. 4 is a front view of the lens barrel in FIG. 3. It is sectional drawing (A) at the time of cut | disconnecting along an AA line in FIG. 5, and sectional drawing (B) at the time of cut | disconnecting along a BB line. It is a figure which shows a sensor holding member and a focus adjustment ring. It is a figure at the time of seeing a lens barrel from the upper surface side. It is sectional drawing (A) at the time of cut | disconnecting along an AA line in FIG. 8, and sectional drawing (B) at the time of cut | disconnecting along a BB line. It is a figure which shows the shape of a focus adjustment ring.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view of the imaging apparatus according to the present embodiment. The lens barrel L is incorporated in the camera body B. The lens barrel L is not limited to a video camera, and can be mounted on an imaging apparatus such as a digital still camera or a portable electronic device.
FIG. 2 is a diagram showing an outline of the configuration of the camera system. The optical system L1 includes a lens group and forms an image of light from the subject. The light amount adjustment unit is an optical device that adjusts the amount of incident light. In this embodiment, the diaphragm unit 3 is exemplified. The image sensor 20 receives light imaged by the optical system L1 and photoelectrically converts it. The output signal of the image sensor 20 is output to the camera signal processing unit 201, subjected to various signal processing, and converted into a video signal. The video signal is displayed as an image on a display (not shown) through a control unit 202 having a CPU (Central Processing Unit), and recorded on a recording medium (not shown) (semiconductor memory, optical disk, hard disk, magnetic tape, etc.). .
The control unit 202 controls the aperture unit driving unit 203 based on the luminance signal component included in the video signal. The aperture unit driving unit 203 changes the aperture diameter of the aperture constituting the aperture unit 3 to a size corresponding to the appropriate light amount.

Next, the structure of the lens barrel L will be described in detail with reference to FIGS. FIG. 3 is a cross-sectional view of the lens barrel L. 4 is an exploded perspective view of the lens barrel L. FIG. FIG. 5 is a front view when the lens barrel L is viewed from the subject side. FIG. 6 is a cross-sectional view of the lens barrel L cut along a predetermined plane. FIG. 7 is a front view when the holding member 4 and the focus adjustment ring 2 of the image sensor 20 are viewed from the subject side. Hereinafter, in the lens barrel L, the subject side is defined as the front side in the optical axis direction, and the imaging surface side is defined as the rear side in the optical axis direction.
The optical system L1 includes a plurality of lens groups. In the present embodiment, the first lens unit L1a on the front side in the optical axis direction and the second lens unit L1b on the rear side in the optical axis direction are provided. The lens holding frame 1 is a lens holding member that holds a lens group. The focus adjustment ring 2 is a rotating member whose center is located on the optical axis of the lens group, and is disposed near the rear end of the lens holding frame 1. The focus adjustment ring 2 is a member for changing the relative positions of the lens holding frame 1 and the sensor holding member 4 in the optical axis direction of the optical system L1.

The sensor holding member 4 holds the image sensor 20. The image sensor 20 is bonded and fixed to the mounting sheet metal 6. The attachment sheet metal 6 and the image sensor 20 after being bonded are fastened and fixed to the sensor holding member 4 with three screws 7. The low-pass filter 5 is an optical member disposed between the image sensor 20 and the second lens group L1b.
A male screw-shaped portion 1 f is formed on the outer peripheral portion near the rear end of the lens holding frame 1. A female thread shape portion 2 a corresponding to the male thread shape portion 1 f is formed on the inner diameter portion of the focus adjustment ring 2. The focus adjustment ring 2 is attached to the lens holding frame 1 in a state where the male screw shape portion 1f and the female screw shape portion 2a are screwed together.

  The tension springs 8 a and 8 b are urging members, one end of which is attached to the spring hook of the lens holding frame 1, and the other end is attached to the spring hook of the sensor holding member 4. As a result, an urging force is applied between the lens holding frame 1 and the sensor holding member 4 in a direction in which both members are brought closer to each other. Specifically, the tension spring 8 a is used in a state where each end is hooked on the spring hooking portion 1 d (see FIG. 4) of the lens holding frame 1 and the spring hooking portion 4 d of the sensor holding member 4. The tension spring 8b is used in a state in which each end is hooked on the spring hooking portion 1e (see FIG. 6) of the lens holding frame 1 and the spring hooking portion 4e of the sensor holding member 4. When the focus adjustment ring 2 is rotated by using the tension springs 8a and 8b, the lens holding frame 1 and the sensor holding member 4 can move relatively without play in the optical axis direction.

The first engaging portions 1a and 1b (see FIG. 6A) of the lens holding frame 1 are engaging portions with the sensor holding member 4, and are cylindrical pin-shaped portions. The first engaging portion 1 a is fitted into a hole portion 4 a formed in the sensor holding member 4. The first engaging portion 1 b is fitted with a long hole portion 4 b formed in the sensor holding member 4. That is, the engaged portions provided in the sensor holding member 4 are the hole 4a and the long hole 4b. The roles of the first engaging portion and the engaged portion are as follows.
The lens group is positioned at a predetermined position in a plane perpendicular to the optical axis with respect to the image sensor 20.
The lens holding frame 1 and the sensor holding member 4 are relatively guided in the optical axis direction.
The first engaging portions 1 a and 1 b are located between the two diaphragm blades 3 d constituting the diaphragm unit 3 and the image sensor 20 in the optical axis direction.
As shown in FIG. 4, the aperture unit 3 is attached to the lens holding frame 1 from the side surface direction orthogonal to the optical axis of the optical system. The aperture unit 3 includes an aperture that can move the two aperture blades 3d in a direction perpendicular to the optical axis. The aperture unit 3 is fastened and fixed to the lens holding frame 1 by screws 3b.

  The second engaging portion 1c (see FIG. 4) of the lens holding frame 1 is an engaging portion with the sensor holding member 4, and has a hole shape. The second engaging portion 1 c is fitted with a cylindrical pin-shaped portion 4 c formed on the sensor holding member 4. The role of the second engaging portion 1c and the pin-shaped portion 4c is to prevent the lens group L1 from tilting with respect to the image pickup device 20, and the lens holding frame 1 and the sensor holding member 4 together with the first engaging portion. It is to guide relatively smoothly in the optical axis direction. Therefore, the 2nd engaging part 1c is arrange | positioned in the position spaced apart with the predetermined distance in the optical axis direction with respect to the 1st engaging parts 1a and 1b. In the present embodiment, the second engagement portion 1c is located on the opposite side (front side in the optical axis direction) from the first engagement portions 1a and 1b with the diaphragm blade 3d interposed therebetween in the optical axis direction.

Next, the positional relationship between the extending portion 4f extending in the optical axis direction in the sensor holding member 4 and the diaphragm driving actuator 3e will be described in detail with reference to FIGS. FIG. 8 is a view when the lens barrel L is viewed from the upper surface side. FIG. 9A is a cross-sectional view when the diaphragm unit 3 is cut along a plane along the line AA in FIG. FIG. 9B is a cross-sectional view taken along the line BB in FIG. 8 at a position passing through the through hole 4j.
The diaphragm drive actuator 3e moves the two diaphragm blades 3d. The aperture drive lever 3f has a cylindrical aperture drive magnet (not shown) integrated by insert molding. A diaphragm driving coil (not shown) is fixedly disposed outside the diaphragm driving magnet at a position facing the magnet. Further, a yoke material (not shown) for closing the magnetic flux of the magnet is disposed on the outside thereof. When the diaphragm driving coil is energized, the diaphragm driving magnet rotates and the diaphragm driving lever 3f rotates.

The plurality of rectilinear guide pins 3h restrict the diaphragm blade 3d so that it can linearly move only in the direction indicated by the arrow 3j in FIG. 9A (the direction orthogonal to the optical axis). A plurality of pin portions 3f1 formed at the distal end portion of the aperture driving lever 3f are engaged with the long hole portions of the respective aperture blades 3d. When the aperture driving lever 3f rotates, the aperture blade 3d connected to the pin portion 3f1 of the aperture driving lever 3f is driven in the direction of the arrow 3j. Thereby, the opening / closing operation | movement of the aperture blade 3d is performed with respect to the aperture opening part 3i, and the light quantity which injects into a lens part is adjusted.
The diaphragm drive actuator is a general term for a cylindrical portion including a drive magnet, a drive coil, a yoke material, and, in some cases, a resin housing portion covering the outside thereof.

  The sensor holding member 4 includes a base portion that is a flat portion perpendicular to the optical axis of the optical system L1, and an extending portion 4f that extends from the base portion in a direction parallel to the optical axis. The extending portion 4f is formed as a plurality of peripheral wall portions, and is composed of portions perpendicular to the directions of arrows 4g, 4h, and 4i when the optical axis center L1c (see FIG. 9B) is used as a reference. The extending portion 4f has a through-hole portion 4j penetrating in the thickness direction at least at a part thereof. In the present embodiment, the focus adjustment ring 2 is rotated so that the image pickup surface of the image pickup device 20 and the position (focus surface) for focusing the optical system L1 coincide with each other, and the lens is held at the optimum focus position. Frame 1 is moved. In this state, the lens holding frame 1 and the sensor holding member 4 are integrally bonded and fixed by filling the plurality of through holes 4j with the adhesive 4k. That is, it is possible to fix the individual lenses at the optimum focus position by preventing the relative positional relationship between the lens holding frame 1 and the sensor holding member 4 from shifting in the optical axis direction.

  As shown in FIG. 9B, the through-hole portion 4j is parallel to the optical axis at two locations on the upper surface side of the lens barrel L and at two locations on the bottom surface side facing the upper surface across the optical axis. It is provided as a long hole along the direction. By forming the through-hole portion 4j in the extending portion 4f, it is possible to secure a bonding space in a limited space and prevent the focus surface from shifting after bonding. The reason why the plurality of through-hole portions 4j are provided at positions facing each other across the optical axis of the optical system L1 is to minimize the optical axis shift. For example, when the lens barrel L is pulled due to the stress of the adhesive 4k, the lens holding frame 1 may be displaced in the optical axis direction with respect to the imaging element 20. Therefore, by providing a plurality of through-hole portions 4j at positions facing each other in the extending portion 4f, it is possible to cancel the force pulled by the stress of the adhesive 4k and prevent the optical axis shift.

  As shown in FIG. 8, the through hole 4j formed in the extending portion 4f of the sensor holding member 4 has a long hole shape in the optical axis direction. The reason is that the relative positional relationship between the lens holding frame 1 and the sensor holding member 4 in the optical axis direction is not shifted due to a change in temperature environment after the bonding, a drop impact, or the like. That is, the through hole 4j can be made as long as possible in the optical axis direction to secure a bonding space, and the adhesive strength in the optical axis direction can be increased.

  In this embodiment, as shown in FIG. 9B, an aperture driving actuator 3e is arranged in the direction of the arrow 3g from the optical axis center L1c in a plane perpendicular to the optical axis of the optical system L1. On the other hand, the extending portion 4f of the sensor holding member 4 includes three peripheral wall portions. Each component is a portion perpendicular to the three directions indicated by arrows 4g, 4h, and 4i. That is, the first portion 4fu perpendicular to the direction of the arrow 4g is a peripheral wall portion on the upper surface side of the lens barrel L, and extends along the optical axis direction. A second portion 4fs perpendicular to the direction of the arrow 4h is a side wall portion facing the diaphragm driving actuator 3e with the optical axis center L1c interposed therebetween, and extends along the optical axis direction. A third portion 4fd perpendicular to the direction of the arrow 4i is a peripheral wall portion on the bottom surface side of the lens barrel L, and extends along the optical axis direction.

Further, as shown in FIG. 9B, the tension spring 8a is located in the same range as the first portion 4fu of the extending portion 4f, and is disposed within the outer shape of the extending portion 4f in the direction of the arrow 4g. Has been. Further, the tension spring 8b is located within the same range as the third portion 4fd of the extending portion 4f, and is disposed within the outer shape of the extending portion 4f in the direction of the arrow 4i.
Thus, when the optical axis center L1c is used as a reference, the direction (arrow 3g) in which the diaphragm driving actuator 3e is arranged is different from the direction (arrows 4g, 4h, 4i) in which the extending portion 4f is arranged. By forming a plurality of through-hole portions 4j in the extending portion 4f, an adhering space is secured, and when securing the space for disposing the tension springs 8a and 8b, these can be seen from the optical axis direction. This spring does not protrude outside the extending portion 4f. Therefore, it is possible to take measures to prevent the focus surface from shifting without increasing the diameter of the lens barrel L. In addition, the focus adjustment ring 2 can be urged without increasing the number of parts.

  The focus adjustment ring 2 has a gear portion 2d (FIG. 10) on the outer peripheral portion, and is rotated by a tool (not shown). The gear connected to the stepping motor of the tool is engaged with the gear portion 2d of the focus adjustment ring 2, and the focus adjustment ring 2 is rotated around the optical axis by the rotation of the stepping motor, and the focus adjustment is performed. Specifically, the sensor holding member 4 is clamped by the tool from the top surface side (the direction of arrow 4U in FIG. 9A) and the bottom surface side (the direction of arrow 4D in FIG. 9A). The last step portion of the gear connected to the stepping motor is inserted from a gear insertion through hole 4m (see FIG. 8) formed in the sensor holding member 4 and connected to the gear portion 2d of the focus adjustment ring 2. Details of the shape of the focus adjustment ring 2 will be described later.

Next, the positional relationship among the aperture driving actuator 3e, the optical system L1, and the focus adjustment ring 2 will be described in detail with reference to FIG. FIG. 6B is a cross-sectional view taken along line BB in FIG.
The optical system L1 includes a first lens unit L1a on the front side in the optical axis direction and a second lens unit L1b on the rear side with the diaphragm blade 3d interposed therebetween. In FIG. 6B, a portion where the diameter of the glass of the first lens unit L1a is maximum is indicated by a dimension A. A portion where the glass diameter of the second lens unit L1b is maximum is indicated by a dimension B. The relationship is “A> B”.

The diaphragm driving actuator 3e is located behind the diaphragm blade 3d in the optical axis direction, that is, on the second lens group L1b side. The aperture driving actuator 3e is disposed as close as possible to the second lens unit L1b, and enters the optical axis side of the maximum diameter portion of the first lens unit L1a. The amount of penetration is indicated by dimension G.
When the lens barrel L is viewed from a direction perpendicular to the optical axis, the aperture driving actuator 3e is disposed so as to overlap the focus adjustment ring 2. The overlapping range is indicated by a dimension H. The focus adjustment ring 2 is disposed on the optical axis side relative to the aperture driving actuator 3e.

The focus adjustment ring 2 is fitted with the sensor holding member 4. Specifically, the outer portion 2 b of the focus adjustment ring 2 is in a fitting relationship with the inner diameter portion 4 f of the sensor holding member 4. The fitting backlash between the focus adjustment ring 2 and the sensor holding member 4 is smaller than the screw backlash between the focus adjustment ring 2 and the lens holding frame 1 (screw backlash between the male screw shape portion 1f and the female screw shape portion 2a). The purpose of fitting the focus adjustment ring 2 and the sensor holding member 4 is the deviation in the optical axis direction of the lens holding frame 1 that occurs when the lens holding frame 1 and the focus adjustment ring 2 are displaced by a screw play in the radial direction. Is to improve the focus adjustment accuracy.
In addition, in order to suppress the shift in the optical axis direction of the lens holding frame 1 due to the backlash between the male screw shape portion 1f and the female screw shape portion 2a, the focus adjustment ring 2 and the lens holding frame 1 are in a fitting relationship. Can be considered. On the other hand, in the present embodiment, the diaphragm adjusting actuator 3e is devised so that it can be arranged on the optical axis side as much as possible by fitting the focus adjustment ring 2 and the sensor holding member 4 together. In FIG. 6B, in order to form the inner diameter portion 4f of the sensor holding member 4, a cylindrical rib portion 4g is necessary. The rib portion 4g is in a positional relationship overlapping with the diaphragm driving actuator 3e in the radial direction. The overlap amount is indicated by dimension E. If the rib portion 4g is formed on the lens holding frame 1, the rib portion 4g and the aperture driving actuator 3e interfere with each other in the fitting relationship with the focus adjustment ring 2. As a result, the aperture driving actuator 3e must be disposed outside in the radial direction. By forming the cylindrical rib portion 4g on the sensor holding member 4 as in the present embodiment, it is possible to realize a configuration in which the diaphragm driving actuator 3e is arranged on the inner side (optical axis side) as much as possible.

  Next, the shape of the focus adjustment ring 2 will be described in detail with reference to FIG. Only the portion 2 c is fitted to the inner diameter portion 4 f of the sensor holding member 4 in the outer shape portion 2 b of the focus adjustment ring 2. The focus adjustment ring 2 has a gear portion 2d and a portion 2c (a fitted portion where no gear is formed) on the outer peripheral surface portion. In the present embodiment, the outer diameter of the gear portion 2d and the outer diameter of the portion 2c are the same. The reason is to reduce the outer diameter of the focus adjustment ring 2 while securing the strength of the gear by connecting the gear portion 2d and the portion 2c. By fitting the focus adjustment ring 2 with the sensor holding member 4 with the same fitting diameter as the outer diameter of the gear portion 2d, the outer diameter of the focus adjustment ring 2 can be designed to the minimum. In addition, not only this embodiment but the gear part 2d and the part 2c are connected, and when the intensity | strength of a gear is securable, the outer diameter of the part 2c (to-be-fitted part) shall be below the outer diameter of the gear part 2d. It may be set. The maximum diameter of the focus adjustment ring 2 is smaller than the outer diameter dimension A of the first lens unit L1 shown in FIG.

In the present embodiment, among the lens groups arranged on both sides in the optical axis direction with the diaphragm blade 3d interposed therebetween, a space outside the second lens group L1b having a small outer diameter (in the radial direction away from the optical axis) is effectively used. Can be used. That is, the aperture driving actuator 3e, the fitted portion of the focus adjusting ring 2, and the fitted portion of the sensor holding member 4 can be arranged in the space. Therefore, the size of the lens barrel L including the aperture unit 3 in the radial direction can be minimized.
According to the present embodiment, in the lens barrel having the focus adjustment mechanism, the configuration in which the lens barrel and the image sensor can be moved relative to each other in the optical axis direction can be compactly integrated, and the radial direction orthogonal to the optical axis can be combined. Effective for downsizing. In addition, it is possible to reduce the number of parts and reduce the size while mounting the aperture unit on the lens barrel. Therefore, it is possible to reduce the size of an optical apparatus or an imaging apparatus equipped with this lens barrel.
In the present embodiment, the arrangement directions of the constituent parts of the extending part 4f along the optical axis direction are the three directions indicated by arrows 4g, 4h, and 4i shown in FIG. 9B. Not only this but the structure which arrange | positions only the extension part orthogonal to 4i direction, and does not provide an extension part in 4g and 4h direction may be sufficient. The diaphragm unit 3 is fastened and fixed to the lens holding frame 1 by screws 3b. However, the diaphragm unit 3 may be fastened and fixed to the sensor holding member 4.

DESCRIPTION OF SYMBOLS 1 Lens holding frame 2 Focus adjustment ring 3 Aperture unit 3e Aperture drive actuator 4 Sensor holding member 4f Extension part 8a, 8b Tension spring

Claims (12)

A lens holding member for holding an optical system including a lens;
A sensor holding member that holds an image sensor and guides the lens holding member along an optical axis direction of the optical system;
An actuator for moving a member for adjusting the amount of light;
A relative adjustment position of the sensor holding member and the lens holding member in the optical axis direction of the optical system, and a focus adjustment ring disposed on the optical axis side of the optical system with respect to the actuator; Prepared,
The sensor holding member has an extending portion extending in a direction parallel to the optical axis of the optical system,
When a predetermined direction orthogonal to the optical axis of the optical system is a first direction, at least a part of the actuator and at least a part of the focus adjustment ring overlap each other in the first direction,
In a predetermined cross section orthogonal to the optical axis of the optical system, the predetermined direction is a second direction out of directions in which the optical axis of the optical system is away from a point passing through the predetermined cross section, and the direction opposite to the second direction. Is the third direction, at least a part of the extending part is provided in the second direction, and at least a part of the actuator is not provided with the extending part in the third direction. A lens barrel characterized by that . The extending part of the sensor holding member has a through-hole part,
The lens barrel according to claim 1, wherein the lens holding member and the sensor holding member are fixed by an adhesive filled in the through-hole portion. The lens barrel according to claim 2, wherein the through-hole portion is formed along a direction parallel to the optical axis of the optical system . In a predetermined cross section parallel to the optical axis of the optical system, at least a part of the actuator is closer to the optical axis side of the optical system than the outer peripheral surface of the lens having the largest outer diameter among the lenses included in the optical system. The lens barrel according to any one of claims 1 to 3, wherein the lens barrel is positioned. 5. The lens barrel according to claim 1, further comprising an urging unit that urges the sensor holding member and the lens holding member toward each other . The extending portion has a plurality of peripheral wall portions extending in a direction parallel to the optical axis from a portion perpendicular to the optical axis of the optical system,
6. The lens barrel according to claim 5 , wherein the urging means is a tension spring, and is disposed within the outer shape of the extending portion when viewed from the optical axis direction of the optical system. The extending portion includes a plurality of peripheral wall portions positioned to face each other with an optical axis of the optical system interposed therebetween, and a peripheral wall portion facing the actuator in a plane perpendicular to the optical axis of the optical system. The lens barrel according to any one of claims 1 to 6 . The focus adjustment ring includes a gear portion on an outer peripheral surface portion thereof and a fitted portion that has a diameter equal to or smaller than the outer diameter of the gear portion and fits with the inner diameter portion of the sensor holding member. The lens barrel according to any one of claims 1 to 7 . The outer diameter of the focus adjustment ring lens as claimed in any one of claims 1 to 8, characterized in that the smaller than the outer diameter of the outermost diameter larger lens out of the lens in the optical system Tube. A lens holding member for holding an optical system including a lens;
A sensor holding member that holds an image sensor and guides the lens holding member along an optical axis direction of the optical system;
An actuator for moving a member for adjusting the amount of light,
The sensor holding member has an extending portion extending in a direction parallel to the optical axis of the optical system,
In a predetermined cross section orthogonal to the optical axis of the optical system, a predetermined direction is a first direction out of directions in which the optical axis of the optical system is away from a point passing through the predetermined cross section, and a direction opposite to the first direction. Is the second direction, at least a part of the extending part is provided in the first direction, and the extending part is not provided in the second direction, but at least a part of the actuator. Is provided,
In the predetermined cross section, when a direction orthogonal to the first direction is a third direction and a direction opposite to the third direction is a fourth direction, at least a part of the extending portion is in the third direction. , And at least a part of the extending portion is provided in the fourth direction. A relative position between the sensor holding member and the lens holding member is changed in the optical axis direction of the optical system, and a focus adjustment ring is further disposed on the optical axis side of the optical system than the actuator. ,
When a predetermined direction orthogonal to the optical axis of the optical system is a fifth direction, at least a part of the actuator and at least a part of the focus adjustment ring overlap each other in the fifth direction. The lens barrel according to claim 10. An imaging apparatus comprising the lens barrel according to any one of claims 1 to 11 .

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