JP2024073990A - Lens barrel - Google Patents

Abstract

A lens barrel that can be stably fixed after optical adjustment is provided.
[Solution] A lens barrel comprising: a lens unit having a first lens and a second lens; a holding frame that holds the first lens; an adjustment frame held in the holding frame and that holds the second lens; and a sheet member clamped by the holding frame and the adjustment frame in the optical axis direction of the lens unit, wherein when held by the holding frame, the adjustment frame has a predetermined distance between it and the holding frame in a direction perpendicular to the optical axis, and the sheet member has a protruding portion that protrudes in the direction perpendicular to the optical axis and is fixed to the adjustment frame and holding frame by an adhesive member, and at least a part of the protruding portion is not clamped between the holding frame and the adjustment frame even when the adjustment frame moves in the direction perpendicular to the optical axis within the range of the predetermined distance.
[Selected Figure] Figure 1

Description

The present invention relates to a lens barrel.

Lens barrels are provided with optical adjustment mechanisms for adjusting eccentricity and lens spacing to correct misalignment such as lens tilt and decentering that occurs during the manufacturing process. Eccentricity adjustment is an adjustment in which the lens to be adjusted is moved in a direction perpendicular to the optical axis relative to a reference lens. For example, Patent Document 1 discloses a lens barrel in which a stepped abutment surface is provided inside the barrel, the position of which changes in the optical axis direction in stages, and the position of the lens in the optical axis direction is adjusted by sandwiching the protruding portion of a washer between the abutment surface and the lens frame.

JP 2004-271972 A

In recent years, with the trend towards higher image quality and higher pixel counts, stricter positional accuracy is required for lens misalignment that occurs during the manufacturing process of the lens barrel, and multiple different optical adjustments may be performed on a single lens. However, in the conventional technology disclosed in the above-mentioned Patent Document 1, the position of the lens in the optical axis direction is adjusted by clamping the protruding portion of a washer between a contact surface on the barrel, whose position in the optical axis direction changes stepwise, and the lens frame. The circumferential phase in which the protruding portion of the washer is positioned varies depending on the amount of adjustment required.

Therefore, when further decentering adjustment is performed on the same lens and the lens frame is glued after the decentering adjustment, it is difficult to provide a shape for gluing on the lens barrel side because the phase of the protruding part of the washer is different, and it is difficult to glue and fix the washer itself. Therefore, the washer may move even after the lens frame is glued and fixed, which may affect the lens position deviation.

Therefore, the present invention aims to provide a lens barrel that can be stably fixed after optical adjustment.

In order to achieve the above object, a lens barrel according to one aspect of the present invention comprises a lens unit having a first lens and a second lens, a holding frame that holds the first lens, an adjustment frame that is held in the holding frame and holds the second lens, and a sheet member that is sandwiched between the holding frame and the adjustment frame in the optical axis direction of the lens unit, and when the adjustment frame is held in the holding frame, the adjustment frame has a predetermined distance between it and the holding frame in a direction perpendicular to the optical axis, the sheet member has a protruding portion that protrudes in a direction perpendicular to the optical axis and is fixed to the adjustment frame and the holding frame by an adhesive member, and at least a part of the protruding portion is not sandwiched between the holding frame and the adjustment frame even when the adjustment frame moves in the direction perpendicular to the optical axis within the range of the predetermined distance.

The present invention provides a lens barrel that allows stable optical adjustment.

FIG. 2 is an exploded perspective view of the lens barrel according to the first embodiment. FIG. 2 is an exploded perspective view of the lens barrel according to the first embodiment. FIG. 2 is an exploded perspective view of an optical adjustment group in the first embodiment. FIG. 4 is a front view of an optical adjustment group in the first embodiment. FIG. 4 is a partial enlarged view of an optical adjustment group in the first embodiment. 13 shows a state after decentering adjustment in the optical adjustment group in Example 1. FIG. 4 is a partial cross-sectional view of an optical adjustment group in the first embodiment. FIG. 11 is a front view of an optical adjustment group in the second embodiment. FIG. 11 is a partial enlarged view of an optical adjustment group in the second embodiment. 13 shows a state after decentering adjustment in the optical adjustment group in Example 2. FIG. 11 is a partial cross-sectional view of an optical adjustment group in the second embodiment.

Below, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, the embodiments of the present invention are not limited to the following embodiments. The same or equivalent components, parts, and processes shown in each drawing will be given the same reference numerals, and duplicated explanations will be omitted as appropriate. In addition, some parts that are not important for the explanation will be omitted in each drawing.

Example 1
1 and 2 are exploded perspective views of the lens barrel 1 of the first embodiment. The lens barrel 1 of the first embodiment is composed of two fixed lens groups and three movable lens groups. The lens barrel 1 of the first embodiment will be described below. Although not shown in the figures, the lens barrel 1 is configured to be attachable (detachable) to an imaging device (camera body) not shown. That is, the lens barrel 1 of the first embodiment functions as a lens unit that can be replaceably attached to the imaging device. When attaching the lens barrel 1 to the imaging device, for example, the lens barrel 1 can be attached to the imaging device via a camera mount provided on the imaging device. In addition, the imaging device may be any camera, such as a single-lens reflex camera, a digital video camera, or a network camera, as long as the lens barrel 1 can be attached to it.

In FIG. 1, 10 is the first group that is fixed in the direction of optical axis A (the direction along optical axis A). 20 is the second group that moves in the direction of optical axis A to perform a magnification change operation. 30 is the third group that moves in the direction of optical axis A to perform a magnification change operation. 40 is the fourth group that moves in the direction of optical axis A to perform a focusing operation. 50 is the fifth group that is fixed in the optical axis direction.

The first lens group 11 is held by a first lens holding frame 12. The first lens holding frame 12 is fixed to a front housing member 60. The front housing member 60 is fixed to a rear housing member 70.

Figure 3 is an exploded perspective view of the optical adjustment group (second group 20) in Example 1. The second lens group 21 is a zoom lens group including multiple lenses. The first lens 211 included in the second lens group 21 is held by the second lens holding frame 22. The second lens 212 included in the second lens group 21 is held by the adjustment frame 23. That is, the second lens group 21 has multiple lenses and also functions as a lens unit that holds these lenses. The sheet member 24, which is configured in a circumferential shape, is disposed and held between the second lens holding frame 22 and the adjustment frame 23. That is, the sheet member 24 is held so as to be sandwiched (clamped) between the second lens holding frame 22 and the adjustment frame 23.

The second lens holding frame 22 is engaged with the second group guide member 27 and is supported so that it can move forward and backward along the optical axis A. The second lens holding frame 22 is also engaged with the second group rotation restriction member 28 and is supported so that the center of the second lens group 21 is located on the optical axis A.

The second lens holding frame 22 rotatably holds the second group rack 26. The second group rack 26 engages with the threaded portion of the second group driving member 29, and the second lens holding frame 22 moves forward and backward along the optical axis A together with the second group rack 26 when the second group driving member 29 is driven.

The aperture unit 25 is fixed to the second lens holding frame 22 by a fastening member 252, and adjusts the amount of light incident on the image sensor unit 100. The aperture unit 25 changes the aperture diameter by driving the aperture unit driving section 253, and can adjust the amount of light taken in from the subject. The aperture unit 25 is connected to a bent FPC 251 for transmitting input from the outside, and the bent FPC 251 is pulled out from the rear housing member 70 to the outside and electrically connected to the FPC 71. Note that FPC is an acronym for flexible printed circuits, and is a flexible printed circuit board that is thin, light, and flexibly configured. A detailed configuration regarding optical adjustment using the second lens holding frame 22, the adjustment frame 23, and the sheet member 24 will be described later.

The third lens group 31 is a zoom lens and is held in a third lens holding frame 32. The third lens holding frame 32 is engaged with a third group guide member 34 and is supported so that it can move forward and backward along the optical axis A. The third lens holding frame 32 also engages with a third group rotation restricting member 35 and is supported so that the center of the third lens group 31 is located on the optical axis A.

The third lens holding frame 32 rotatably holds the third group rack 33. The third group rack 33 engages with a threaded portion of the third group driving member 36. The third lens holding frame 32 moves forward and backward in the direction of the optical axis A together with the third group rack 33 by being driven by the third group driving member 36.

The fourth lens group 41 is a focus lens and is held by a fourth lens holding frame 42. The fourth lens holding frame 42 engages with the third group guide member 34 and is supported so that it can advance and retreat in the direction of the optical axis A. The fourth lens holding frame 42 also engages with the third group rotation restriction member 35 and is supported so that the center of the fourth lens group 41 is located on the optical axis A. The fourth lens holding frame 42 rotatably holds a fourth group rack 43. The fourth group rack 43 engages with a threaded portion of a fourth group driving member 44. The fourth lens holding frame 42 advances and retreats in the direction of the optical axis A together with the fourth group rack 43 by being driven by the fourth group driving member 44.

The fifth lens group 51 is held in a fifth lens holding frame 52. The fifth lens holding frame 52 is fixed to the rear housing member 70. The filter switching unit 80 can selectively move optical filters such as an infrared cut filter 81 and a glass cut filter 82 into or out of the optical path (in the optical path) by driving a filter driving member 87, etc.

The filter holding frame 83 holds an infrared cut filter 81 and a glass cut filter 82. The filter holding frame 83 is supported by a filter guide member 85 so as to be movable in the radial direction, i.e., in a direction perpendicular to the optical axis (direction perpendicular to the optical axis A direction). The filter holding frame 83 also engages with a rotation restriction member 86, so that rotation around the film guide member 85 is restricted. The filter guide member 85 and the rotation restriction member 86 are disposed and fixed between the rear housing member 70 and the image sensor holding member 90. That is, the filter guide member 85 and the rotation restriction member 86 are sandwiched and fixed between the rear housing member 70 and the image sensor holding member 90. The filter holding frame 83 rotatably holds a filter rack 84. The filter rack 84 engages with a screw portion of a filter drive member 87, and the filter holding frame 83 moves together with the filter rack 84 in the direction perpendicular to the optical axis when the filter drive member 87 is driven.

By driving the filter driving member 87 to move the filter holding frame 83 in a direction perpendicular to the optical axis and removing the infrared cut filter 81 from the optical path, a shooting mode called night mode is established in which light of a specific wavelength is not cut. The night mode is a mode that allows good shooting of subjects even at night by focusing infrared light as well. On the other hand, a shooting mode in which the filter driving member 87 is driven to move the filter holding frame 83 in a direction perpendicular to the optical axis and the infrared cut filter 81 is inserted into the optical path is called a day mode in which visible light is focused, and allows shooting of subjects during the day.

The image sensor holding member 90 holds the image sensor unit 100 and is fixed to the rear housing member 70. The image sensor unit 100 receives light guided by each of the first group 10, second group 20, third group 30, fourth group 40, and fifth group 50, and converts it into image information.

Next, the detailed configuration of the second group 20 that performs optical adjustment will be described with reference to Figs. 3 to 5. Fig. 4 is a front view of the optical adjustment group (second group 20) in Example 1. Fig. 5 is a partially enlarged view of the optical adjustment group (second group 20) in Example 1. Note that Figs. 4 and 5 omit configuration that is not necessary for the description.

As described above, the sheet member 24 is sandwiched and held between the second lens holding frame 22 and the adjustment frame 23. The sheet member 24 is fixed in its circumferential position by engaging with an engaging portion 224 provided on the peripheral wall portion 221 of the second lens holding frame 22.

At this time, by changing the thickness of the sheet member 24, the distance in the direction of the optical axis A between the first lens 211 held in the second lens holding frame 22 and the second lens 212 held in the adjustment frame 23 can be adjusted.

When the adjustment frame 23 is held by the second lens holding frame 22, it is housed inside the peripheral wall portion 221 so as to have an adjustment space 225 in the direction perpendicular to the optical axis. The adjustment space 225 is a gap formed between the adjustment frame 23 and the second lens holding frame 22 at a predetermined interval in the direction perpendicular to the optical axis. In other words, when the adjustment frame 23 is held by the second lens holding frame 22, it has a predetermined interval from the second lens holding frame 22 in the direction perpendicular to the optical axis A. At this time, the adjustment frame 23 holding the second lens 212 can be translated in the direction perpendicular to the optical axis within the range of the adjustment space 225 to adjust the eccentric positions of the first lens 211 held by the second lens holding frame 22 and the second lens 212 held by the adjustment frame 23.

In addition, the peripheral wall portion 221 has grooves 222 formed at three locations at intervals of about 120 degrees in the circumferential direction so as to surround the outer periphery of the adjustment frame 23. On the other hand, the outer periphery of the sheet member 24 sandwiched between the second lens holding frame 22 and the adjustment frame 23 has protrusions (exposed portions) 241 formed at three locations at intervals of about 120 degrees in the circumferential direction. Specifically, the grooves 222 are formed at positions facing the protrusions 241 in the optical axis orthogonal direction when the second lens holding frame 22 holds the adjustment frame 23 when viewed on a plane perpendicular to the optical axis, and are formed so as to be recessed in the optical axis orthogonal direction with respect to the protruding direction of the protrusions 241. In addition, in Example 1, the protrusions 241 are provided at three locations at intervals of about 120 degrees in the circumferential direction, but this is not limited to this, and the intervals in the circumferential direction may be arbitrary, and it is sufficient that one or more locations are provided. In this case, the grooves 222 are also formed at locations corresponding to the protrusions 241. Also, the number of grooves 222 may be greater than the number of protrusions 241.

At this time, the groove 222 of the second lens holding frame 22 and the protrusion 241 of the sheet member 24 are arranged in approximately the same phase, and the protrusion 241 is accommodated inside the groove 222 on a plane perpendicular to the optical axis. Then, by applying the adhesive member 201 to the groove 222, the groove 222 of the second lens holding frame 22, the protrusion 241 accommodated in the groove 222, and the side surface of the adjustment frame 23 facing the groove 222 are simultaneously adhered.

In addition, at this time, after adhesive fixing with the adhesive member 201, the adjustment frame 23 and the second lens holding frame 22 may be fastened with screws 202 to ensure further holding strength. Figure 6 shows the state after decentering adjustment in the optical adjustment group (second group 20) in Example 1.

When the adjustment frame 23 in the first embodiment is moved in the direction perpendicular to the optical axis by eccentric adjustment, for example, the position can be adjusted within the range of the adjustment space 225 provided between the peripheral wall portion 221 of the second lens holding frame 22. When this position adjustment is performed, the protruding portion 241 of the sheet member 24 sandwiched between the second lens holding frame 22 and the adjustment frame 23 is accommodated inside the groove portion 222. Therefore, no matter where the adjustment frame 23 is located within the range of the adjustment space 225, at least a part of the protruding portion 241 is always exposed to the outside without being sandwiched between the second lens holding frame 22 and the adjustment frame 23. In other words, when stored inside the groove portion, it is not in contact with the second lens holding frame 22 and the adjustment frame 23. As a result, the three parts of the sheet member 24 including the second lens holding frame 22, the adjustment frame 23, and the protruding portion 241 can always be simultaneously adhesively fixed after the eccentric adjustment.

In addition, the protrusion 241 overlaps part of the space formed by the groove 222 on a plane perpendicular to the optical axis when the adjustment frame 23 is held by the second lens holding frame 22. As a result, when viewed from the optical axis A direction, part of the bottom surface of the groove 222 is exposed and not covered by the protrusion 241 of the sheet member 24. Therefore, when the adhesive member 201 is applied to the groove 222, the adhesive member 201 can also be applied to the bottom surface of the groove 222, and the contact area between the groove 222 and the adhesive member 201 can be made larger. This ensures an increase in adhesive strength.

Figure 7 is a partial cross-sectional view of the optical adjustment group (second group 20) in Example 1. The partial cross-sectional view in Figure 7 shows the groove portion 222 of the second lens holding frame 22, the adjustment frame 23, and the protrusion portion 241 of the sheet member 24 cut out in a cross section parallel to the optical axis.

As shown in FIG. 7, the groove portion 222 has a side wall portion (first extension portion) 223 that extends in the optical axis A direction. The side wall portion 223 is formed so that the extension amount in the optical axis A direction is greater than the thickness of the sheet member 24. The adjustment frame 23 also has an extension portion (second extension portion) 231 that extends in the optical axis A direction. Like the side wall portion 223, the extension portion 231 is also formed so that the extension amount in the optical axis A direction is greater than the thickness of the sheet member 24.

As a result, the side wall portion 223 of the groove portion 222 and the extension portion 231 of the adjustment frame 23 form a space capable of accommodating the applied adhesive material 201 while applying the adhesive material 201 in the direction of the optical axis A even when the protrusion portion 241 of the sheet member 24 is disposed in the groove portion 222. The adhesive material 201 applied to the groove portion 222 comes into contact with the side wall portion 223 and the extension portion 231, thereby allowing a large contact area with the second lens holding frame 22 and the adjustment frame 23. This ensures adhesive strength.

In addition, in FIG. 7, the adhesive material 201 is shown applied only to a portion of the space formed by the groove portion 222 and the adjustment frame 23, but the adhesive material 201 may be applied so as to fill the space, and any amount of adhesive material 201 can be applied.

The above configuration makes it possible to simultaneously fix the positions of the three components, the second lens holding frame 22, the adjustment frame 23, and the sheet member 24, by gluing after the eccentricity adjustment. This allows the relative positions of the lenses to be stably fixed (accurately held) after high-precision optical adjustment has been performed.

Example 2
The lens barrel 1 and the optical adjustment group (second group 20) in the second embodiment will be described below with reference to Fig. 8 and Fig. 9. Descriptions of parts common to the first embodiment will be omitted as appropriate. Fig. 8 is a front view of the optical adjustment group (second group 20) in the second embodiment. Fig. 9 is a partial enlarged view of the optical adjustment group (second group 20) in the second embodiment.

As in Example 1, when the adjustment frame 23 is held by the second lens holding frame 22, it is housed inside the peripheral wall portion 221 of the second lens holding frame 22 so as to have an adjustment space 225 in the direction perpendicular to the optical axis (radial direction). At this time, by translating the adjustment frame 23 holding the second lens 212 within the range of the adjustment space 225 in the direction perpendicular to the optical axis, the eccentric positions of the first lens 211 held by the second lens holding frame 22 and the second lens 212 held by the adjustment frame 23 can be adjusted.

Three grooves 222 are formed in the peripheral wall 221 at intervals of approximately 120 degrees in the circumferential direction so as to surround the outer periphery of the adjustment frame 23. Meanwhile, three recesses 232 are formed in the adjustment frame 23 at positions facing the grooves 222 in the direction perpendicular to the optical axis at intervals of approximately 120 degrees in the circumferential direction.

The sheet member 24 has an exposed portion 242. The exposed portion 242 is a portion of the sheet member 24 that is always exposed at the location of the recess 232 of the adjustment frame 23, of the sheet member 24 that is sandwiched between the second lens holding frame 22 and the adjustment frame 23 on the plane perpendicular to the optical axis.

At this time, the adhesive member 201 is applied to the space formed by the groove portion 222 and the recessed portion 232 arranged at a position facing the groove portion 222 in the direction perpendicular to the optical axis. This simultaneously bonds the groove portion 222 of the second lens holding frame 22, the recessed portion 232 of the adjustment frame 23, and the exposed portion 242 of the sheet member 24 exposed by the recessed portion 232.

In addition, at this time, after adhesive fixing with the adhesive member 201, the adjustment frame 23 and the second lens holding frame 22 may be fastened with screws 202 to ensure further holding strength. Figure 10 is a diagram showing the state after decentering adjustment in the optical adjustment group (second group 20) in Example 2.

When the adjustment frame 23 in the second embodiment is moved in the direction perpendicular to the optical axis by the eccentric adjustment, for example, the position can be adjusted within the range of the adjustment space 225 provided between the peripheral wall portion 221 of the second lens holding frame 22. When this position adjustment is performed, the exposed portion 242 of the sheet member 24 sandwiched between the second lens holding frame 22 and the adjustment frame 23 is determined by the recessed portion 232 of the adjustment frame 23. Here, the size (length) of the recessed portion 232 in the direction perpendicular to the optical axis from the outer periphery of the adjustment frame 23 is larger than the adjustment space 225. That is, the recessed amount of the recessed portion 232 is larger than the interval in the direction perpendicular to the optical axis of the adjustment space 225. As a result, no matter where the adjustment frame 23 is located within the range of the adjustment space 225, a part of the sheet member 24 (exposed portion 242) is kept exposed by the recessed portion 232. As a result, the three parts of the second lens holding frame 22, the adjustment frame 23, and the sheet member 24 can always be simultaneously adhesively fixed after the eccentric adjustment.

As shown in FIG. 10, by applying the adhesive member 201 so as to straddle the groove portion 222 and the sheet member 24, the adhesive member 201 also comes into contact with the bottom surface of the groove portion 222. By increasing the contact area between the groove portion 222 and the adhesive member 201, the adhesive strength can be ensured.

Figure 11 is a partial cross-sectional view of the optical adjustment group (second group 20) in Example 2. The groove portion 222 of the second lens holding frame 22, the recessed portion 232 of the adjustment frame 23, and the exposed portion 242 of the sheet member 24 are cut out in a cross section parallel to the optical axis.

As shown in FIG. 11, the groove portion 222 has a side wall portion (first extension portion) 223 that extends in the optical axis A direction. The side wall portion 223 extends by a larger amount in the optical axis A direction than the thickness of the sheet member 24. The adjustment frame 23 also has an extension portion (second extension portion) 231 that extends in the optical axis A direction. The extension portion 231 is also formed so as to extend by a larger amount in the optical axis A direction than the thickness of the sheet member 24, similar to the side wall portion 223.

As a result, the side wall portion 223 of the groove portion 222 and the extension portion 231 of the adjustment frame 23 form a space capable of accommodating the adhesive member 201 in the direction of the optical axis A even when the exposed portion 242 of the sheet member 24 is disposed in the groove portion 222. By contacting the side wall portion 223 and the extension portion 231, the adhesive member 201 can have a large contact area with the second lens holding frame 22 and the adjustment frame 23, and the adhesive strength can be ensured.

In FIG. 11, the adhesive material 201 is applied only to a portion of the space formed by the groove portion 222 and the adjustment frame 23, but it may be applied so as to fill the space, and any amount of adhesive material 201 can be applied.

The above configuration makes it possible to simultaneously fix the positions of the three components, the second lens holding frame 22, the adjustment frame 23, and the sheet member 24, by gluing after the eccentricity adjustment. This allows the relative positions of the lenses to be stably fixed (accurately held) after high-precision optical adjustment has been performed, similar to Example 1.

Here, in the first and second embodiments, the adhesive member 201 may be an ultraviolet-curable adhesive, a thermosetting adhesive, a two-part mixture adhesive, or any other adhesive member with different properties depending on the desired properties.

In addition, in the first and second embodiments, the infrared cut filter 81 and the glass cut filter 82 may be filters with different characteristics depending on the desired captured image. Also, a configuration may be used in which no filters are provided and light passes through directly.

In addition, in Examples 1 and 2, the sheet member 24 may be made of any material, such as a film material, a metal material such as stainless steel, or a resin material.

The disclosure of this embodiment includes the following configuration:

(Configuration 1)
a lens unit having a first lens and a second lens;
a holding frame that holds a first lens;
an adjustment frame that is held by the holding frame and holds a second lens;
a sheet member that is sandwiched between the holding frame and the adjustment frame in the optical axis direction of the lens unit,
the adjustment frame has a predetermined distance from the holding frame in a direction perpendicular to the optical axis when the adjustment frame is held by the holding frame;
the sheet member has a protruding portion that protrudes in a direction perpendicular to the optical axis and is fixed to the adjustment frame and the holding frame by an adhesive member;
At least a part of the protrusion is not clamped between the holding frame and the adjustment frame even when the adjustment frame moves in a direction perpendicular to the optical axis within a range of a predetermined interval.
A lens barrel characterized by:

(Configuration 2)
2. The lens barrel according to claim 1, wherein the sheet member is circumferential, and one or more protrusions are formed on the outer periphery of the sheet member.

(Configuration 3)
The holding frame has grooves whose number corresponds to the number of the protrusions,
The lens barrel described in configuration 2, wherein the groove portion is arranged at a position facing the protrusion in a direction perpendicular to the optical axis when the holding frame holds the adjustment frame, and is formed so as to be recessed in the protruding direction of the protrusion.

(Configuration 4)
4. The lens barrel according to configuration 3, wherein, in a plane perpendicular to the optical axis, the protrusion overlaps a portion of the space formed by the groove.

(Configuration 5)
5. The lens barrel according to configuration 3 or 4, wherein the holding frame, the adjustment frame, and the sheet member are each fixed by an adhesive material applied to the grooves.

(Configuration 6)
The groove portion has a first extension portion formed by extending in the optical axis direction,
the adjustment frame has a second extension portion formed by extending in the optical axis direction,
6. The lens barrel according to any one of configurations 3 to 5, wherein the first extension and the second extension are formed to be higher than a thickness of the sheet member.

(Configuration 7)
7. The lens barrel according to any one of configurations 1 to 6, wherein the sheet member engages with the holding frame in a circumferential direction.

(Configuration 8)
6. The lens barrel according to any one of configurations 1 to 5, wherein the adjustment frame has a recess formed so as to be recessed inward from the outer periphery of the adjustment frame in a direction perpendicular to the optical axis.

(Configuration 9)
The sheet member has one or more exposed portions;
The lens barrel according to configuration 8, wherein the exposed portion is a portion that is exposed by a recess when the sheet member is clamped by the holding frame and the adjustment frame.

(Configuration 10)
The holding frame has grooves whose number corresponds to the number of the exposed portions,
10. The lens barrel according to configuration 9, wherein the recess is disposed at a position facing the groove in a direction perpendicular to the optical axis.

(Configuration 11)
11. The lens barrel according to any one of configurations 8 to 10, wherein the recess has a recess amount greater than a predetermined interval in a direction perpendicular to the optical axis.

(Configuration 12)
The groove portion has a first extension portion formed by extending in the optical axis direction,
the recess has a second extension portion formed by extending in the optical axis direction,
11. The lens barrel according to configuration 10, wherein the first extension and the second extension are formed to be higher than a thickness of the sheet member.

The above describes preferred embodiments of the present invention, but the present invention is not limited to these embodiments, and various modifications and variations are possible within the scope of the gist of the invention.

REFERENCE SIGNS LIST 1 Lens barrel 20 Second group 201 Adhesive member 21 Second group lens 211 First lens 212 Second lens 22 Second lens holding frame 225 Adjustment space 23 Adjustment frame 24 Sheet member 241 Protruding portion 242 Exposed portion

Claims (12)

a lens unit having a first lens and a second lens;
a holding frame that holds the first lens;
an adjustment frame that is held by the holding frame and holds the second lens;
a sheet member that is sandwiched between the holding frame and the adjustment frame in the optical axis direction of the lens unit,
when the adjustment frame is held by the holding frame, a predetermined distance is provided between the adjustment frame and the holding frame in a direction perpendicular to the optical axis,
the sheet member has a protrusion that protrudes in a direction perpendicular to the optical axis and is fixed to the adjustment frame and the holding frame by an adhesive member;
at least a part of the protrusion is not clamped between the holding frame and the adjustment frame even when the adjustment frame moves in a direction perpendicular to the optical axis within the range of the predetermined interval.
A lens barrel characterized by: The lens barrel according to claim 1, characterized in that the sheet member is circumferential, and one or more of the protrusions are formed on the outer periphery of the sheet member. the holding frame has grooves the number of which corresponds to the number of the protrusions,
The lens barrel according to claim 2, characterized in that the groove portion is arranged at a position facing the protrusion in a direction perpendicular to the optical axis when the holding frame holds the adjustment frame, and is formed so as to be recessed in the protruding direction of the protrusion. The lens barrel according to claim 3, characterized in that, in a plane perpendicular to the optical axis, the protrusion overlaps a portion of the space formed by the groove. The lens barrel according to claim 3, characterized in that the holding frame, the adjustment frame, and the sheet member are each fixed by the adhesive material applied to the groove portion. the groove portion has a first extension portion formed by extending in the optical axis direction,
the adjustment frame has a second extension portion formed by extending in the optical axis direction,
The lens barrel according to claim 3 , wherein the first extension and the second extension are formed to be higher than a thickness of the sheet member. The lens barrel according to claim 1, characterized in that the sheet member engages with the holding frame in the circumferential direction. The lens barrel according to claim 1, characterized in that the adjustment frame has a recess formed so as to be recessed inward from the outer periphery of the adjustment frame in a direction perpendicular to the optical axis. the sheet member has one or more exposed portions;
The lens barrel according to claim 8 , wherein the exposed portion is a portion that is exposed by the recess when the sheet member is clamped between the holding frame and the adjustment frame. the holding frame has grooves the number of which corresponds to the number of the exposed portions,
The lens barrel according to claim 9 , wherein the recess is disposed at a position facing the groove in a direction perpendicular to the optical axis. The lens barrel according to claim 8, characterized in that the recess has a recess amount greater than the predetermined interval in a direction perpendicular to the optical axis. the groove portion has a first extension portion formed by extending in the optical axis direction,
the recess has a second extension portion formed by extending in the optical axis direction,
The lens barrel according to claim 10 , wherein the first extension and the second extension are formed to be higher than a thickness of the sheet member.

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