Lens module

Abstract

To achieve a technique for reducing a change in inclination of a lens barrel with a simple configuration in a screw-in type lens module.SOLUTION: The lens barrel has a screw portion on an outer peripheral surface thereof and holds a lens, the lens holder has a screw portion screwed with the screw portion of the lens barrel on an inner peripheral surface thereof and holds the lens barrel so as to be movable forward and backward in an optical axis direction of the lens, and a biasing member is disposed between the outer peripheral surface of the lens barrel and the inner peripheral surface of the lens holder.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a lens module and an imaging device including the lens module. [Background technology]

[0002] A screw-in lens module is known in which the lens barrel that holds the lens can be rotated to move the lens barrel forward or backward along the optical axis to adjust the focus. In a screw-in lens module, a threaded portion is formed on the lens barrel and the lens holder to which the lens barrel is attached. The lens holder and lens barrel are screwed together via the threaded portion, and rotating the lens barrel moves the lens barrel relative to the lens holder along the optical axis.

[0003] Furthermore, in screw-in lens modules, play occurs between the threads of the lens barrel and the threads of the lens holder due to tolerances and manufacturing errors. If this play causes the lens barrel to tilt relative to the lens holder, it may tilt relative to the image sensor. Particularly with screw-in lens modules, the lens barrel moves every time it is rotated to adjust the focus, causing the lens barrel's tilt to change. When the lens barrel's tilt changes, it is time-consuming to adjust the image sensor's tilt to match the lens barrel's tilt.

[0004] Patent document 1 discloses a technology in which a part of the lens barrel has an extension portion that elastically deforms, and when the lens barrel and lens holder are screwed together, the extension portion comes into contact with the lens holder and elastically deforms, generating a reaction force that suppresses play between the lens barrel and the lens holder. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2023-74047 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the technology of Patent Document 1, one end of the lens barrel is biased toward the optical axis by the reaction force of the elastic deformation of the lens barrel, and when the lens barrel is rotated, the position where the reaction force of the elastic deformation of the lens barrel occurs changes, so the change in the tilt of the lens barrel when rotated cannot be reduced.

[0007] The present invention provides a technique for reducing changes in the tilt of a lens barrel with a simple configuration in a screw-in type lens module. [Means for solving the problem]

[0008] According to the lens module of the present invention, the lens module comprises a lens barrel having a threaded portion on its outer peripheral surface and holding a lens, a lens holder having a threaded portion on its inner peripheral surface that screws into the threaded portion of the lens barrel and holding the lens barrel so that it can move back and forth in the optical axis direction of the lens, and a biasing member arranged between the outer peripheral surface of the lens barrel and the inner peripheral surface of the lens holder, wherein a convex portion is formed on a part of the inner peripheral surface of the lens holder, and the biasing member biases the lens barrel toward the lens holder by abutting against the convex portion. [Effects of the Invention]

[0009] According to the present invention, in a screw-in type lens module, it is possible to reduce the change in tilt of the lens barrel with a simple configuration. [Brief explanation of the drawings]

[0010] [Figure 1] Overall view of a camera module equipped with the lens module of embodiment 1. [Figure 2] FIG. 1 is an exploded perspective view of a camera module equipped with the lens module of the first embodiment. [Figure 3] 1 is a cross-sectional view of a lens module according to a first embodiment; [Figure 4]FIG. 1 is a front view of a lens holder according to a first embodiment; [Figure 5] 1 is a cross-sectional view of a plane where a biasing member of a lens module according to a first embodiment is disposed; [Figure 6] Partially enlarged view of the vicinity of the convex portion of the first embodiment. [Figure 7] FIG. 1 is a perspective view of a lens holder according to a first embodiment; [Figure 8] FIG. 10 is a front view of the lens holder according to the second embodiment; [Figure 9] FIG. 10 is a cross-sectional view of the lens module of the second embodiment, taken along a plane where a biasing member is disposed. [Figure 10] Partially enlarged view of the convex portion of the second embodiment [Figure 11] FIG. 10 is a front view of a lens holder and an imaging unit according to a second embodiment; [Figure 12] 10 is a cross-sectional view of a lens module according to a third embodiment. [Figure 13] 10 is a cross-sectional view of the lens module of the third embodiment taken along a plane where a biasing member is disposed. [Figure 14] Partially enlarged cross-sectional view of a convex portion of embodiment 3 [Figure 15] 1 is a cross-sectional view of a camera module according to a first embodiment; DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0012] <Embodiment 1> The lens module according to the first embodiment will be described below with reference to Fig. 1 to Fig. 7. Fig. 1 is an overall view of a camera module equipped with the lens module according to the first embodiment. Fig. 2 is an exploded perspective view of the camera module equipped with the lens module according to the first embodiment.

[0013] The camera module 1 is made up of a lens module 4 and an imaging unit 5 fixed to the lens module 4. The lens module 4 is made up of a lens barrel 10, a lens holder 20, and a biasing member 30. The lens barrel 10 holds a lens group 100 including at least one lens. The lens barrel 10 is detachable (replaceable) from the lens holder 20. Therefore, when it is desired to change the focal length, the lens barrel 10 is replaced. The lens holder 20 holds the lens barrel 10 so that it can move back and forth in the optical axis direction of the lens. The biasing member 30 is a member that biases the lens barrel 10. The biasing member 30 seals the gap between the lens holder 20 and the lens barrel 10.

[0014] The imaging unit 5 is composed of an imaging element 60 and an imaging board 70. The imaging element 60 is a CMOS sensor or a CCD sensor that photoelectrically converts an optical image (subject image) formed by the imaging optical system and outputs an analog electrical signal (imaging signal). The imaging element 60 is mounted on the imaging board 70. The imaging board 70 is fixed to the lens holder 20 with screws 80. Note that the imaging board 70 and the lens holder 20 may be fixed by other means, such as adhesive fixation. Alternatively, the imaging board 70 may be fixed to a plate member, and the imaging board 70 may be fixed to the lens holder 20 via the plate member. Furthermore, a sealing member may be disposed between the imaging board 70 and the lens holder 20 to prevent dust from adhering to the imaging element 60.

[0015] Next, the lens module 4 will be described in detail with reference to Fig. 3. Fig. 3 is a cross-sectional view of the lens module of the first embodiment.

[0016] Lens barrel 10 has a cylindrical portion 11 on its outer periphery, and a male thread portion 12 is formed in part of cylindrical portion 11. Lens barrel 10 is made of a metal such as aluminum or a resin such as polycarbonate.

[0017] The lens holder 20 has a cylindrical tube portion 21 on its inner peripheral surface. The tube portion 21 has a first tube portion 25 and a second tube portion 23 (inner peripheral abutment portion). A female thread portion 22 is formed in a part of the first tube portion 25. The second tube portion 23 is a portion where the urging member 30 is disposed and abuts against it. The second tube portion 23 is located closer to the object side than the first tube portion 25 in the direction of the optical axis O.

[0018] The inner diameter of the second cylindrical portion 23 is larger than the inner diameter of the first cylindrical portion 25. That is, the cylindrical portion 21 has a stepped shape. The first cylindrical portion 25 and the second cylindrical portion 23 may be flush with each other. The lens holder 20 is made of a metal such as aluminum or a resin such as polycarbonate. Hereinafter, the second cylindrical portion 23 will be referred to as the inner peripheral abutment portion.

[0019] The biasing member 30 is an annular packing made of an elastic material such as silicone. The biasing member 30 is sandwiched between the cylindrical portion 11 of the lens barrel 10 and the inner peripheral abutment portion 23 of the lens holder 20. By sandwiching the biasing member 30 between the lens barrel 10 and the lens holder 20, the biasing member 30 seals the gap between the lens barrel 10 and the lens holder 20. Furthermore, the biasing member 30 abuts against a convex portion 24 of the lens holder 20, which will be described later, thereby biasing the lens barrel 10 toward the lens holder 20. More specifically, the biasing member 30 biases the lens barrel 10 in substantially the same direction as the protruding direction of the convex portion 24.

[0020] As shown in FIG. 3, biasing member 30 is disposed closer to the object side in the direction of optical axis O than male thread portion 12 of lens barrel .

[0021] The lens barrel 10 is attached to the lens holder 20 by threading the male thread portion 12 of the lens barrel 10 into the female thread portion 22 of the lens holder 20. By rotating the lens barrel 10 relative to the lens holder 20, the lens barrel 10 moves forward and backward along the optical axis O relative to the lens holder 20. This allows for focus adjustment by changing the position of the lens barrel 10 along the optical axis O relative to the imaging unit 5 fixed to the lens holder 20. Note that play occurs between the male thread portion 12 of the lens barrel 10 and the female thread portion 22 of the lens holder 20 due to tolerances and manufacturing errors. In other words, there is a small gap between the male thread portion 12 of the lens barrel 10 and the female thread portion 22 of the lens holder 20. This can cause the lens barrel 10 to tilt relative to the imaging element 60. Therefore, after completing the position adjustment of the lens barrel 10, the tilt of the imaging element 60 is adjusted. Specifically, this adjustment is made while tilting the imaging board 70 on which the imaging element 60 is mounted.

[0022] Next, the inner peripheral contact portion 23 of the lens holder 20 will be described in detail with reference to Figs. 4 and 7. Fig. 4 is a front view of the lens holder of the first embodiment. Fig. 5 is a cross-sectional view of the plane where the biasing member of the lens module of the first embodiment is arranged. Fig. 6 is a partially enlarged view of the vicinity of the convex portion of the first embodiment. Fig. 7 is a perspective view of the lens holder of the first embodiment. Fig. 15 is a cross-sectional view of the camera module of the first embodiment.

[0023] A convex portion 24 is formed on the inner peripheral abutment portion 23 of the lens holder 20. As shown in FIG. 7, the convex portion 24 protrudes from the inner peripheral abutment portion 23 in the direction of the optical axis O. As shown in FIG. 6, the inner peripheral abutment portion 23 and the convex portion 24 are continuously connected without any steps, forming an inclined surface. The biasing member 30 biases the lens barrel 10 toward the lens holder 20 by abutting against the convex portion 24.

[0024] 3 and 7, a part of convex portion 24 has an inclined portion 24a that inclines inward (toward the optical axis) with respect to optical axis O as it approaches image sensor side 60. When lens barrel 10 and lens holder 20 are screwed together, the gap between convex portion 24 and cylindrical portion 11 of lens barrel 10 is smaller than the gap between inner circumferential abutment portion 23 and cylindrical portion 11 of lens barrel 10.

[0025] Therefore, the amount of pressure applied to the biasing member 30 by the convex portion 24 is greater at the location where the convex portion 24 is provided than at the location where the convex portion 24 is not provided. As a result, the biasing force that the lens barrel 10 receives from the biasing member 30 is greater than when the convex portion 24 is not provided. Therefore, the lens barrel 10 is always biased relative to the lens holder 20 in the direction of arrow A, which is a direction perpendicular to the optical axis O. Therefore, even when the lens barrel 10 is rotated for focus adjustment, the tilt of the lens barrel 10 can be reduced.

[0026] Because the change in tilt of the lens barrel 10 is reduced, the tilt of the imaging unit 5 can be easily adjusted to match the tilt tendency of the lens barrel 10. As described above, the lens barrel 10 is constantly biased relative to the lens holder 20 in the direction of arrow A, which is perpendicular to the optical axis O. Therefore, the lens barrel 10 tends to tilt counterclockwise around the orthogonal direction perpendicular to the optical axis. Therefore, as shown in FIG. 15 , the imaging board 70 of the imaging unit 5 is rotated counterclockwise (in the direction of arrow F) around the orthogonal direction perpendicular to the optical axis, and adjusted so that it tilts in the same direction as the lens barrel 10. The tilt adjustment and fixing method for the imaging unit 5 may be performed by sandwiching a washer or the like between the contact surfaces of the imaging board 70 and the lens holder 20 to adjust the tilt of the imaging unit 5 and then fixing it with a screw, or by other means.

[0027] Furthermore, even when the user rotates lens barrel 10 to adjust focus, the change in tilt of lens barrel 10 can be reduced, so there is no need to adjust the tilt of imaging unit 5 each time.

[0028] Note that, because the change in tilt of lens barrel 10 can be reduced, it is not necessary to adjust the tilt of imaging unit 5 and then fix it to lens holder 20. Alternatively, the height of the contact surface of lens holder 20 that comes into contact with imaging unit 5 may be corrected and shaped to match the tendency of tilt of lens barrel 10, so that the tilt of lens barrel 10 and the tilt of imaging unit 5 can be matched without adjustment.

[0029] As described above, in this embodiment, lens barrel 10 is constantly biased relative to lens holder 20 in a direction perpendicular to optical axis O, which reduces changes in tilt of lens barrel 10 compared to a configuration in which lens barrel 10 is not biased in a direction perpendicular to the optical axis O. This also makes it easier to adjust the tilt of imaging unit 5.

[0030] Furthermore, there is no need to open an opening in the lens holder 20 to provide a biasing member, pressing member, cover member, etc.; the change in tilt of the lens barrel 10 can be reduced with a simple configuration that simply sandwiches the biasing member 30 between the lens barrel 10 and the lens holder 20.

[0031] Furthermore, in this embodiment, the biasing member 30 is sandwiched between the lens barrel 10 and the lens holder 20, thereby sealing the gap between the lens barrel 10 and the lens holder 20. As a result, the biasing member 30 not only reduces changes in the tilt of the lens barrel 10, but also functions to prevent water, dust, and the like from entering the inside of the lens holder 20.

[0032] That is, in a configuration in which it is necessary to sandwich the biasing member 30 between the lens barrel 10 and the lens holder 20 to prevent water, dust, etc. from entering the inside of the lens barrel 20, there is no need to add a new part to reduce the change in tilt of the lens barrel 10. Therefore, it is possible to reduce the change in tilt of the lens barrel 10 with a simple configuration. Note that the biasing member 30 does not necessarily have to prevent the entry of water, dust, etc.

[0033] Furthermore, in this embodiment, the inner circumferential abutment portion 23 and the protrusion 24 are continuously connected without any steps. This allows the urging member 30 to easily follow and make contact even near the boundary between the inner circumferential abutment portion 23 and the protrusion 24, making it less likely that a gap will form, and the urging member 30 can prevent water and dust from entering the lens holder 20. Note that the inner circumferential abutment portion 23 and the protrusion 24 do not necessarily have to be continuously connected.

[0034] Furthermore, in this embodiment, biasing member 30 is disposed closer to the object in the direction of optical axis O than male thread portion 12 of lens barrel 10. This prevents dust and other particles from entering male thread portion 12 of lens barrel 10 and female thread portion 22 of lens holder 20, protecting male thread portion 12 and female thread portion 22 from dust and other particles that could impede the rotation of lens barrel 10. Furthermore, if lens barrel 10 or lens holder 20 is made of metal, this prevents water and other particles from reaching male thread portion 12 of lens barrel 10 or female thread portion 22 of lens holder 20, preventing rust on male thread portion 12 or female thread portion 22. Note that biasing member 30 does not necessarily have to be disposed closer to the object in the direction of optical axis O than male thread portion 12 of lens barrel 10.

[0035] 3 and 7, a portion of the convex portion 24 has an inclined portion 24a that is inclined with respect to the optical axis O. This makes it less likely that the urging member 30 will get caught on the convex portion 24 when the urging member 30 is clamped while the lens barrel 10 and the lens holder 20 are screwed together during assembly. This makes it easier to assemble the urging member 30 in the correct assembly position where it abuts against the inner circumferential abutment portion 23 and the convex portion 24. Note that the portion of the convex portion 24 does not necessarily have to have the inclined portion 24a.

[0036] As described above, according to this embodiment, in a screw-in type lens module, it is possible to reduce changes in the tilt of the lens barrel with a simple configuration.

[0037] <Embodiment 2> The lens module of the second embodiment will be described below with reference to Figs. 8 to 11. In this embodiment, components common to those of the first embodiment are given the same reference numerals as those of the first embodiment. Descriptions of configurations common to those of the first embodiment will be omitted. Fig. 8 is a front view of the lens holder of the second embodiment. Fig. 9 is a cross-sectional view of the plane where the biasing member of the lens module of the second embodiment is arranged. Fig. 10 is a partially enlarged view of the convex portion of the second embodiment. Fig. 11 is a front view of the lens holder and imaging unit of the second embodiment.

[0038] Two protrusions 24 are provided on inner peripheral abutment portion 23 of lens holder 20. When lens barrel 10 and lens holder 20 are screwed together, the gap between protrusions 24 of lens holder 20 and cylindrical portion 11 is smaller than the gap between inner peripheral abutment portion 23 and cylindrical portion 11. Therefore, the amount of pressure exerted by protrusions 24 on biasing member 30 is greater at the locations where protrusions 24 are provided than at locations where protrusions 24 are not provided. As a result, the biasing force that lens barrel 10 receives from biasing member 30 is greater. Therefore, lens barrel 10 is constantly biased relative to lens holder 20 in the direction of arrow D, which is perpendicular to optical axis O and is the resultant force of biasing forces B and C generated at the locations where protrusions 24 are provided.

[0039] 11, two convex portions 24 are provided so that the direction of arrow D in which lens barrel 10 is biased is parallel to a line S connecting diagonal corners of image sensor 60. Note that in the present invention, "parallel" does not only mean perfectly parallel, but also includes substantial parallelism within a certain margin of error.

[0040] 10, a connecting portion 24b having a fillet shape or the like is provided between the inner circumferential contact portion 23 and the convex portion 24, and the convex portion 24 and the inner circumferential contact portion 23 are continuously connected via the connecting portion 24b. By providing the connecting portion 24b, the biasing member 30 can more easily follow and contact the boundary between the inner circumferential contact portion 23 and the convex portion 24. This makes it less likely that a gap will occur, and the biasing member 30 can more easily prevent water and dust from entering the lens holder 20. Note that the connecting portion 24b as in the first embodiment may not be provided. Also, the inner circumferential contact portion 23 and the convex portion 24 do not necessarily have to be continuously connected.

[0041] As described above, in this embodiment, convex portions 24 are provided in two locations on inner peripheral abutment portion 23 of lens holder 20. As a result, even when lens barrel 10 is rotated for focus adjustment, lens barrel 10 is always biased relative to lens holder 20 in the direction of arrow D, which is perpendicular to optical axis O, and therefore, changes in the tilt of lens barrel 10 can be reduced.

[0042] Furthermore, there is no need to open an opening in the lens holder 20 to provide a biasing member, pressing member, cover member, etc.; the change in tilt of the lens barrel 10 can be reduced with a simple configuration that simply sandwiches the biasing member 30 between the lens barrel 10 and the lens holder 20.

[0043] Furthermore, in this embodiment, there are three locations where the lens barrel 10 is biased by the pressure of the biasing member 30 by the convex portion 24 and where the lens barrel 10 comes into contact with the lens holder 20 due to the biasing, making it easier to reduce changes in the inclination of the lens barrel 10.

[0044] The two protrusions 24 are preferably provided within a semicircular region of the inner circumferential abutment portion 23. In other words, the interval between the two protrusions 24 is preferably within 180 degrees on a circle centered on the optical axis.

[0045] This reduces the mutually cancelling force of the biasing forces B and C in the resultant force of the biasing forces B and C, making it easier to stably bias the lens barrel 10 in the direction of arrow D perpendicular to the optical axis O relative to the lens holder 20.

[0046] The number of protrusions 24 does not necessarily have to be two, but may be three or more, or may be one as in the first embodiment.

[0047] Furthermore, two convex portions 24 are provided so that the direction of arrow D, in which lens barrel 10 is biased, is parallel to a line S connecting the diagonal corners of image sensor 60. This makes it easier to reduce changes in tilt of lens barrel 10. On the other hand, the diagonal corner of image sensor 60 is the farthest from the optical axis and is therefore more susceptible to the effects of tilt.

[0048] Therefore, by making the direction of arrow D in which lens barrel 10 is biased parallel to line S connecting the diagonal corners of image sensor 60, it becomes easier to reduce the deterioration of peripheral resolution in the image. Note that the direction in which lens barrel 10 is biased does not necessarily have to be the diagonal direction of image sensor 60.

[0049] As described above, according to this embodiment, in a screw-in type lens module, it is possible to reduce changes in the tilt of the lens barrel with a simple configuration.

[0050] <Embodiment 3> The lens module according to the third embodiment will be described below with reference to Fig. 12 to Fig. 14. In this embodiment, components common to those in the first embodiment are denoted by the same reference numerals as those in the first embodiment. Also, descriptions of configurations common to those in the first embodiment will be omitted.

[0051] Fig. 12 is a cross-sectional view of the lens module of embodiment 3. Fig. 13 is a cross-sectional view of the lens module of embodiment 3 on a plane where a biasing member is arranged. Fig. 14 is a partially enlarged cross-sectional view of a convex portion of embodiment 3.

[0052] In the third embodiment, the biasing member 30 is disposed closer to the image sensor 60 in the direction of the optical axis O than the male thread portion 12 of the lens barrel 10. The biasing member 30 is sandwiched between the lens barrel 10 and the lens holder 20, thereby sealing the gap between the lens barrel 10 and the lens holder 20. This allows the biasing member 30 to function as a barrier to water, dust, and the like from entering the interior of the lens holder 20. Note that the biasing member 30 does not necessarily have to prevent the intrusion of water, dust, and the like.

[0053] 14, a side surface portion 24c is provided between the inner peripheral contact portion 23 and the protrusion 24. In order to realize the function of the biasing member 30 in preventing the intrusion of water, dust, and the like, it is preferable that the length of the side surface portion 24c is as short as possible so that the biasing member 30 can easily follow and come into contact even in the vicinity of the side surface portion 24c.

[0054] The side surface portion 24c may not be provided, and the inner circumferential contact portion 23 and the convex portion 24 may be continuously connected as in the first embodiment. Alternatively, the inner circumferential contact portion 23 and the convex portion 24 may be continuously connected via a connecting portion 24b as in the second embodiment. Also, a plurality of convex portions 24 may be formed as in the second embodiment. Also, a part of the convex portion 24 may have an inclined portion 24a inclined with respect to the optical axis as in the first embodiment.

[0055] When lens barrel 10 and lens holder 20 are screwed together, the gap between convex portion 24 and cylindrical portion 11 is smaller than the gap between inner circumferential abutment portion 23 and cylindrical portion 11. Therefore, where convex portion 24 is present, the amount of pressure applied to biasing member 30 increases, and the biasing force that lens barrel 10 receives from biasing member 30 increases. Therefore, lens barrel 10 is constantly biased relative to lens holder 20 in the direction of arrow E, which is perpendicular to optical axis O.

[0056] Furthermore, even when the lens barrel 10 is rotated to adjust the focus, the lens barrel 10 is always biased in the direction of the arrow E perpendicular to the optical axis O relative to the lens holder 20, thereby reducing changes in the inclination of the lens barrel 10.

[0057] Furthermore, there is no need to open an opening in the lens holder 20 to provide a biasing member, pressing member, cover member, etc.; the change in tilt of the lens barrel 10 can be reduced with a simple configuration that simply sandwiches the biasing member 30 between the lens barrel 10 and the lens holder 20.

[0058] As described above, according to this embodiment, in a screw-in type lens module, it is possible to reduce changes in the tilt of the lens barrel with a simple configuration.

[0059] <Modification> In addition, in the first to third embodiments, there may be a plurality of annular urging members 30. In the case of a configuration using a plurality of urging members 30, it is sufficient that the inner peripheral abutment portion 23 of the lens holder 20, which is in contact with at least one of the urging members 30, has a convex portion 24.

[0060] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments and various modifications and changes are possible within the scope of the gist of the present invention. Furthermore, the present invention is not limited to these embodiments as long as the configuration takes into consideration the design function. [Explanation of symbols]

[0061] 1 camera module 4 Lens Module 5 Imaging unit 10 Lens barrel 11 Cylinder part 12 Male thread 20 Lens holder 21 Cylinder part 22 Female thread 23 Inner circumferential contact portion (second cylindrical portion) 24 Convex part 24a Slope 24b Connection 24c Side part 25 First cylindrical part 30 biasing member 60 image sensor 70 Imaging board 80 bis 100 lens group

Claims

1. a lens barrel having a threaded portion on its outer circumferential surface and holding a lens; a lens holder having a threaded portion on an inner circumferential surface thereof that threadably engages with the threaded portion of the lens barrel, and holding the lens barrel so as to be capable of advancing and retreating in the optical axis direction of the lens; a biasing member disposed between the outer peripheral surface of the lens barrel and the inner peripheral surface of the lens holder, a convex portion is formed on a part of the inner circumferential surface of the lens holder; The lens module according to claim 1, wherein the biasing member biases the lens barrel toward the lens holder by contacting the convex portion.

2. 2. The lens module according to claim 1, wherein the biasing member biases the lens barrel in substantially the same direction as the direction in which the convex portion protrudes.

3. The lens module according to claim 1 , wherein the convex portion is an inclined surface that protrudes from the inner circumferential surface of the lens holder.

4. 2. The lens module according to claim 1, wherein the convex portion is provided closer to the object side in the optical axis direction of the lens than the threaded portion of the lens holder.

5. 2. The lens module according to claim 1, wherein the inner diameter of the portion of the inner circumferential surface of the lens holder where the convex portion is provided is larger than the inner diameter of the portion where the threaded portion is provided.

6. The lens module according to claim 1 , wherein the convex portion has an inclined portion that is inclined so as to approach the optical axis of the lens as it moves toward the image pickup element side in the optical axis direction.

7. The lens module according to claim 1 , wherein the lens holder is provided with a plurality of the convex portions.

8. The lens module according to claim 7 , wherein the plurality of convex portions are arranged within 180 degrees of a circle centered on the optical axis of the lens.

9. 2. The lens module according to claim 1, wherein the direction in which the lens barrel is urged by the urging member is a diagonal direction of an image pickup element attached to the lens holder.

10. 2. The lens module according to claim 1, wherein the biasing member seals a gap between the outer peripheral surface of the lens barrel and the inner peripheral surface of the lens holder.

11. An imaging device comprising: an imaging element; and the lens module according to claim 1 .

Images