JP2008064942A - Lens adjustment mechanism and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens adjustment mechanism capable of easy focus adjustment by rotating a member ensuring a sufficient length in its axial direction. <P>SOLUTION: The lens adjustment mechanism includes a lens frame that holds an imaging lens, has a male screw on its peripheral face and a projecting part which projects in the direction of the optical axis of the imaging lens and on the surface side of an image formed by the imaging lens; a holding member, that has a guide part for guiding the projecting part in the direction of the optical axis; and a lens barrel, that has on its internal circumferential face a female screw to be engaged with the male screw of the lens frame, wherein the position of the imaging lens is adjusted, by controlling in such a manner that while the image formation surface side end of the lens barrel is abutted against the holding member, the lens barrel is rotated and move the lens frame, straight in the direction of the optical axis via the female and male screws. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lens adjustment mechanism that adjusts the position of an imaging lens by moving the imaging lens straight in the optical axis direction.

  2. Description of the Related Art Conventionally, an imaging device that has been reduced in size is mounted on a portable terminal such as a mobile phone or a PDA (Personal Digital Assistant). When the imaging lens used in this imaging apparatus is a bright lens, the depth of focus becomes shallow. Therefore, it is necessary to adjust the focus by moving the imaging lens back and forth in the optical axis direction in the manufacturing process.

  As a technique for performing focus adjustment in this way, the lens frame (lens barrel) that holds the imaging lens, and a cylindrical holding member (holder) that holds the lens frame and the imaging device, etc., are provided on the side of the outer periphery of the lens frame. A lens adjustment mechanism for moving the lens frame in the optical axis direction of the imaging lens by rotating the lens frame by providing inclined end surfaces on the rear end surface of the flange portion protruding in the direction and the front end surface of the holding member. It is known (see Patent Document 1).

In addition, a lens frame (holding with a first aperture stop) that holds the imaging lens and a cylindrical holding member (holder) that holds the lens frame, and a projection that protrudes laterally from the outer periphery of the imaging lens. A lens adjustment mechanism is known in which the lens frame moves in the optical axis direction of the imaging lens by engaging with a cam groove provided on the inner peripheral surface of the lens and rotating the lens frame (see Patent Document 2).
JP 2004-94013 A JP 2002-82271 A

  In general, an image pickup apparatus as a unit including an image pickup lens, an image pickup element, and the like is subjected to focus adjustment before being incorporated into a mobile phone or a PDA. Regarding the focus adjustment, in Patent Documents 1 and 2 described above, the lens frame is rotated by holding the outer periphery of the lens frame with a finger. However, since both are short in the optical axis direction, it is difficult to rotate and the work efficiency is poor. . Also, when trying to automate focus adjustment, it is difficult to grip the outer periphery of the lens frame with a robot arm.

  In Patent Documents 1 and 2, both lens frames protrude toward the subject side from the holding member. Therefore, after performing the focus adjustment, some external force may be applied to the lens frame in a process such as transportation of the imaging apparatus, and the adjusted focus may be shifted. In addition, since the position of the tip of each lens frame differs depending on the focus adjustment, image pickup devices having different lengths in the optical axis direction are mass-produced, which causes a problem in dimensional management when incorporated in a small mobile phone or the like.

  In order to solve such a problem, a lens adjustment mechanism configured such that the front end portion of the lens frame does not protrude from the front end portion of the holding member is conceivable. An example of this is shown in the cross-sectional view of FIG.

  In FIG. 1, reference numeral 1 denotes an imaging lens. Reference numeral 2 denotes a lens frame that holds the imaging lens 1 and has an external thread 2a on the outer peripheral surface. Reference numeral 4 denotes a holding member having a female screw 4a screwed onto the inner peripheral surface of the male screw 2a. An image sensor 5 such as a CCD is mounted on the printed wiring board 6, and the printed wiring board 6 is attached to the holding member 4. Reference numeral 7 denotes a decorative board that covers unsightly parts.

  In such a lens adjustment mechanism, two concave portions 2b in which a part of the male screw 2a is notched are provided on the object side surface of the lens frame 2 at a point-symmetrical position with respect to the optical axis O. The lens frame 2 is rotated by engaging the eye spanner with the male screw 2a, and the lens frame 2 is advanced and retracted in the direction of the optical axis O through the male screw 2a screwed to the female screw 4a to adjust the position of the imaging lens 1. . Then, after the adjustment, the adhesive S is injected into the recess 2b, and the lens frame 2 and the holding member 4 are joined.

  However, in such a lens adjustment mechanism, the operation efficiency is not good because the engagement of the crab spanner is lacking, and it is difficult to automate the focus adjustment with the engagement of the crab spanner. In addition, since the position in the rotational direction of the recessed portion 2b after adjustment is individually different, it is difficult to automate the injection of the adhesive S. Further, since the crab spanner is engaged with the recess 2b, the recess 2b needs to have a certain size for reasons of strength, and it is difficult to reduce the overall outer diameter and reduce the size. .

  An example of the dimensions is shown in FIG. 1. In this case, the holding member 4 has a radius of 4.05 mm, which is still insufficient for miniaturization.

  The present invention has been made in view of such a problem, and can easily adjust the focus easily by gripping and rotating the outer peripheral portion of a member that can secure a sufficient length in the axial direction. It is another object of the present invention to propose a lens adjustment mechanism and an image pickup apparatus including the lens adjustment mechanism, in which the outer peripheral portion of the member can be gripped by a robot arm and the focus adjustment can be easily automated.

The object is achieved by the invention described below.
1. A lens frame that holds the imaging lens, has an external thread on the outer peripheral surface, and has a protruding portion that protrudes toward the imaging surface by the imaging lens in the optical axis direction of the imaging lens;
A holding member having a guide portion for guiding the protruding portion in the optical axis direction;
A lens barrel having a female screw threadedly engaged with a male screw of the lens frame on the inner peripheral surface;
With
The lens frame is moved straight in the optical axis direction via the female screw and the male screw by rotating the lens barrel while the end of the lens barrel on the imaging surface side is in contact with the holding member. And adjusting the position of the imaging lens.
2. Provide a concave portion in which a part of the male screw is cut out on the subject side surface of the lens frame;
After adjusting the imaging lens, an adhesive is injected into the recess to join the lens frame and the lens barrel, and the object side end of the lens barrel and the holding member are joined with the adhesive. 2. The lens adjustment mechanism according to 1, wherein
3. Holding the imaging lens, and having a protruding portion protruding from the first outer peripheral surface in a direction orthogonal to the optical axis of the imaging lens, and having an external thread on the arc-shaped second outer peripheral surface of the protruding portion A lens frame,
A holding member that has a guide portion that fits with the first outer peripheral surface on the inner peripheral surface, and that slides on the side wall in the optical axis direction of the protruding portion and engages with the protruding portion;
An adjustment jig having a female screw threadably engaged with the male screw;
With
By screwing the female screw of the adjustment jig into the male screw of the lens frame and rotating the adjustment jig at a fixed position, the lens frame is moved in the optical axis direction via the female screw and the male screw. A lens adjustment mechanism that adjusts the position of the imaging lens by linearly moving.
4). After the adjustment of the imaging lens, the end of the lens frame on the imaging plane side by the imaging lens is always located closer to the imaging plane than the end of the holding member on the imaging plane side. 4. The lens adjustment mechanism according to 3, wherein
5. A concave portion formed by cutting out a part of the first outer peripheral surface is provided on the subject side surface of the lens frame;
The lens adjustment mechanism according to 3 or 4, wherein after the adjustment of the imaging lens, an adhesive is injected into the concave portion to join the lens frame and the holding member.
6). 6. The lens adjustment mechanism according to 5, wherein a gap formed by an end portion on the imaging surface side of the projecting portion and the guide portion of the holding member is sealed with an adhesive.
7). The lens adjustment mechanism according to 5 or 6, wherein the adjustment jig is removed after the adhesive is solidified.
8). A lens frame that holds the imaging lens and has a protruding portion that protrudes from the outer peripheral surface in a direction orthogonal to the optical axis of the imaging lens, and a cam pin that protrudes from the protruding portion in a direction orthogonal to the optical axis;
A holding member that has a guide portion that fits with the outer peripheral surface of the lens frame at the inner peripheral surface and that slidably contacts the side wall in the optical axis direction of the protruding portion and engages with the protruding portion;
An adjustment jig having a cam groove that engages with the cam pin on the inner peripheral surface;
With
By engaging the cam groove of the adjustment jig with the cam pin of the lens frame and rotating the adjustment jig at a fixed position, the lens frame moves straight in the optical axis direction via the cam groove and the cam pin. And adjusting the position of the imaging lens.
9. After the adjustment of the imaging lens, the end of the lens frame on the imaging plane side by the imaging lens is always located closer to the imaging plane than the end of the holding member on the imaging plane side. 9. The lens adjustment mechanism according to 8, wherein
10. A concave portion obtained by notching a part of the outer peripheral surface is provided on the subject side surface of the lens frame,
The lens adjustment mechanism according to claim 8 or 9, wherein after the adjustment of the imaging lens, an adhesive is injected into the recess to join the lens frame and the holding member.
11. 11. The lens adjustment mechanism according to 10, wherein an air gap formed between an end portion on the imaging surface side of the projecting portion and a guide portion of the holding member is sealed with an adhesive.
12 The lens adjustment mechanism according to 10 or 11, wherein the adjustment jig is removed after the adhesive is solidified.
13. A lens frame that holds the imaging lens, has a cam groove on the outer peripheral surface, and has a protruding portion that protrudes toward the imaging surface side of the imaging lens in the optical axis direction of the imaging lens, and the protruding portion. A holding member having a guide for guiding in the optical axis direction;
An adjustment jig having a cam pin that engages with the cam groove on the inner peripheral surface;
With
By engaging the cam pin of the adjustment jig with the cam groove of the lens frame and rotating the adjustment jig while bringing the end of the adjustment jig on the imaging surface side into contact with the holding member, A lens adjustment mechanism for adjusting the position of the imaging lens by moving the lens frame linearly in the optical axis direction of the imaging lens via the cam pin and the cam groove.
14 An opening is provided by cutting out the outer peripheral surface of the adjustment jig,
14. The lens adjustment mechanism according to 13, wherein after the adjustment of the imaging lens, an adhesive is injected from the opening to join the lens frame and the holding member.
15. 15. The lens adjustment mechanism according to 14, wherein the adjustment jig is removed after the adhesive is solidified.
16. An image sensor that forms a subject image with the imaging lens;
The lens adjustment mechanism according to any one of 1 to 15,
An imaging apparatus comprising:

  According to the lens adjustment mechanism and the imaging apparatus of the present invention, it is very easy to rotate and can easily perform focus adjustment by gripping and rotating the outer periphery of a member that can secure a sufficient length in the axial direction. Furthermore, it is easy to automate focus adjustment by gripping the outer peripheral portion of the member with a robot arm.

[First Embodiment]
A first embodiment of the lens adjustment mechanism will be described with reference to FIGS. FIG. 2 is a cross-sectional view of the lens adjustment mechanism, and FIG. 3 is a perspective view of a main part of the lens adjustment mechanism.

  In the figure, 11 is an imaging lens. Reference numeral 12 denotes an image pickup lens 11, an external thread 12 a on the outer peripheral surface, and two protrusions 12 b that protrude in the direction of the optical axis O of the image pickup lens 11 and protrude toward the image formation surface of the image pickup lens 11. Is a lens frame. Reference numeral 13 denotes a lens barrel having a female screw 13a threadedly engaged with the male screw 12a on the inner peripheral surface. Reference numeral 14 denotes a holding member having two long grooves 14a as guide portions for guiding each protrusion 12b in the direction of the optical axis O. Reference numeral 15 denotes an image sensor such as a CCD that forms a subject image by the imaging lens 11, which is mounted on the printed wiring board 16, and the printed wiring board 16 is attached to the holding member 14. Reference numeral 17 denotes a decorative board that covers unsightly parts.

  In the lens adjustment mechanism configured as described above, the lens barrel 13 is rotated while the end of the lens barrel 13 on the image plane side is in contact with the holding member 14. At this time, since the two protruding portions 12b of the lens frame 12 are respectively inserted into the two long grooves 14a, the lens frame 12 cannot rotate with respect to the holding member 14, and can only move linearly. Therefore, the lens barrel 13 is rotated at a fixed position, and the lens frame 12 is moved straight in the direction of the optical axis O via the male screw 12a screwed with the female screw 13a, so that the imaging lens 11 is moved to the imaging element 15. Adjust the focus position.

  Here, the lens frame 12 is provided with two concave portions 12c in which a part of the male screw 12a is cut out on the surface on the subject side. Therefore, after the focus adjustment, the adhesive S is injected into the recess 12c, and the lens frame 12 and the lens barrel 13 are joined. Subsequently, the lens barrel 13 and the holding member 14 are also bonded with the adhesive S.

  With the configuration as described above, the outer periphery of the lens barrel 13 having a sufficient length in the axial direction can be gripped and rotated during focus adjustment. Therefore, the lens barrel 13 can be rotated with a robot arm. It is easy to automate gripping and rotating. In addition, since the position of the recess 12c is always constant, automation of the injection of the adhesive S is also easy. Further, since the concave portion 12c is not used for turning with a cramp wrench, it can be made smaller than the concave portion 2b of the lens adjusting mechanism as shown in FIG. 1. As a result, for example, as shown in FIG. The outer diameter can be made smaller than the lens adjustment mechanism as shown in FIG.

[Second Embodiment]
A second embodiment of the lens adjustment mechanism will be described with reference to FIGS. 4 is a cross-sectional view of the lens adjustment mechanism, and FIG. 5 is a perspective view of a main part of the lens adjustment mechanism.

  In the figure, 21 is an imaging lens. 22 holds the imaging lens 21, and has two protruding portions 22b protruding from the first outer peripheral surface 22a in a direction orthogonal to the optical axis O of the imaging lens 21, and a second arc-shaped second portion in the protruding portion 22b. It is a lens frame having an external thread 22c on the outer peripheral surface. Reference numeral 23 denotes a holding member which is fitted to the first outer peripheral surface 22a on the inner peripheral surface 23a. The holding member 23 has two large cutouts as guide portions, and the side wall 22d in the direction of the optical axis O of the protruding portion 22b of the lens frame 22 is opposite to the side wall 23b of the cutout in the direction of the optical axis O. The projection 22b is in sliding contact with the cutout. Reference numeral 24 denotes an adjusting jig having, on its inner peripheral surface, a female screw 24a that is screwed with a male screw 22c protruding from the long groove 23b. Reference numeral 25 denotes an image sensor such as a CCD that forms a subject image by the imaging lens 21, which is mounted on the printed wiring board 26, and the printed wiring board 26 is attached to the holding member 23. Reference numeral 27 denotes a decorative board that covers unsightly parts.

  In the lens adjustment mechanism configured as described above, the female screw 24 a of the adjustment jig 24 is screwed into the male screw 22 c of the lens frame 22, and the subject-side inner surface of the adjustment jig 24 is set to the subject-side end surface of the holding member 23. The adjusting jig 24 is kept in a fixed position and rotated. At this time, since the two protrusions 22b of the lens frame 22 are respectively fitted in the two notches of the holding member 23, the lens frame 22 cannot rotate with respect to the holding member 23 and moves straight. Is only possible. Accordingly, the adjustment jig 24 is rotated at a fixed position, and the lens frame 22 is linearly moved in the direction of the optical axis O via the male screw 22c screwed with the female screw 24a to the image pickup device 25 of the image pickup lens 21. Adjust the focus position.

  Here, the lens frame 22 is provided with two concave portions 22e formed by cutting out a part of the first outer peripheral surface 22a on the subject side surface. Therefore, after adjusting the focus, an adhesive is injected into the recess 22e to join the lens frame 22 and the holding member 23 together. Subsequently, an air gap is formed between the notch of the holding member 23 and the projection 22b on the imaging surface side, and foreign matter such as dust may enter from the air gap. Seal with. Then, after the adhesive is solidified, the adjustment jig 24 is removed.

  Note that the imaging frame side end 22f of the lens frame 22 is always located closer to the imaging plane side than the imaging plane side end of the notch of the holding member 23. Preventing the intrusion of

  By configuring as described above, the outer periphery of the adjustment jig 24 having a sufficient length in the axial direction can be gripped and rotated at the time of focus adjustment. Therefore, the adjustment jig 24 is very easy to rotate. It is easy to automate gripping and rotating with an arm. Further, since the position of the recess 22e is always constant, automation of the injection of the adhesive S is easy. Further, since the concave portion 22e is not used for turning with a cramp wrench, it can be made smaller than the concave portion 2b of the lens adjusting mechanism as shown in FIG. 1. As a result, for example, as shown in FIG. The outer diameter can be made smaller than the lens adjustment mechanism as shown in FIG.

[Third Embodiment]
A third embodiment of the lens adjustment mechanism will be described with reference to FIGS. FIG. 6 is a cross-sectional view of the lens adjustment mechanism, and FIG. 7 is a perspective view of a main part of the lens adjustment mechanism.

  In the figure, reference numeral 31 denotes an imaging lens. Reference numeral 32 denotes an image pickup lens 31, and has two protrusions 32 a protruding from the outer peripheral surface in a direction perpendicular to the optical axis O of the image pickup lens 31, and each protrusion 32 a in a direction orthogonal to the optical axis O. This is a lens frame having cam pins 32b that protrude more. Reference numeral 33 denotes a holding member having two long grooves 33a as guide portions that are fitted in sliding contact with the side wall in the direction of the optical axis O in the protruding portion 32a. Reference numeral 34 denotes an adjustment jig having a cam groove 34a that engages with the cam pin 32b on the inner peripheral surface. Reference numeral 35 denotes an image sensor such as a CCD that forms a subject image by the imaging lens 31, which is mounted on the printed wiring board 36, and the printed wiring board 36 is attached to the holding member 33. Reference numeral 37 denotes a decorative board that covers unsightly parts.

  In the lens adjustment mechanism configured as described above, the cam groove 34a of the adjustment jig 34 is engaged with the cam pin 32b of the lens frame 32, and the end of the adjustment jig 34 on the image plane side is brought into contact with the holding member 33. However, the adjustment jig 34 is rotated while being maintained at a fixed position. At this time, since the two projecting portions 32a of the lens frame 32 are respectively fitted with the two long grooves 33a, the lens frame 32 cannot rotate with respect to the holding member 33 and can only move linearly. . Accordingly, the adjustment jig 34 is rotated at a fixed position, and the lens frame 32 is linearly moved in the direction of the optical axis O via the cam pin 32b engaged with the cam groove 34a, so that the imaging lens 31 is moved to the imaging element 35. Adjust the focus position.

  Here, the lens frame 32 is provided with a concave portion 32c in which a part of the outer peripheral surface is cut out on the surface on the subject side. Therefore, after the focus adjustment, the adhesive S is injected into the recess 32c, and the lens frame 32 and the holding member 33 are joined. Then, after the adhesive is solidified, the adjustment jig 34 is removed. Subsequently, a gap is formed between the long groove 33a and the projection 32a on the image plane side, and foreign matter such as dust may enter from the gap, and the gap is sealed with an adhesive S or the like.

  The end 32d on the image forming surface side of the lens frame 32 is always located closer to the image forming surface than the end of the long groove 33a of the holding member 33 on the image forming surface side. Preventing the intrusion of

  With the configuration as described above, the outer periphery of the adjustment jig 34 having a sufficient length in the axial direction can be gripped and rotated during focus adjustment. Therefore, the adjustment jig 34 is very easy to rotate. It is easy to automate gripping and rotating with an arm. In addition, since the position of the recess 32c is always constant, automation of the injection of the adhesive S is easy. Further, since the concave portion 32c is not used for turning with a crab wrench, it can be made smaller than the concave portion 2b of the lens adjusting mechanism as shown in FIG. 1. As a result, for example, the radius becomes 3.3 mm as shown in FIG. The outer diameter can be made smaller than the lens adjustment mechanism as shown in FIG. However, only the cam pin 32b protrudes from this outer diameter.

[Fourth Embodiment]
A fourth embodiment of the lens adjustment mechanism will be described with reference to FIGS. FIG. 8 is a cross-sectional view of the lens adjustment mechanism, and FIG. 9 is a perspective view of a main part of the lens adjustment mechanism.

  In the figure, reference numeral 41 denotes an imaging lens. 42 holds the imaging lens 41, has a cam groove 42 a on the outer peripheral surface, and has two protrusions 42 b on the imaging surface side of the imaging lens 41 in the direction of the optical axis O of the imaging lens 41. It is a lens frame. Reference numeral 43 denotes a holding member having two long grooves 43a as guide portions that fit into the protruding portions 42b. Reference numeral 44 denotes an adjusting jig having a cam pin 44a that engages with the cam groove 42a on the inner peripheral surface, and an opening 44b that is greatly opened for adhesion, which will be described later. Reference numeral 45 denotes an image sensor such as a CCD that forms a subject image by the imaging lens 41, which is mounted on the printed wiring board 46, and the printed wiring board 46 is attached to the holding member 43. Reference numeral 47 is a decorative board that covers unsightly parts.

  In the lens adjustment mechanism configured as described above, the cam pin 44a of the adjustment jig 44 is engaged with the cam groove 42a of the lens frame 42, and the end of the adjustment jig 44 on the image plane side is brought into contact with the holding member 43. However, the adjustment jig 44 is rotated while being maintained at a fixed position. At this time, since the two projecting portions 42b of the lens frame 42 are fitted in the two long grooves 43a, the lens frame 42 cannot rotate with respect to the holding member 43, and can only move in a straight line. . Accordingly, the adjustment jig 44 is rotated at a fixed position, and the lens frame 42 is linearly moved in the direction of the optical axis O via the cam groove 42a engaged with the cam pin 44a, so that the imaging lens 41 is moved to the imaging element 45. Adjust the focus position.

  After the focus adjustment, the adhesive S is injected from the opening 44b of the adjustment jig 44, and the lens frame 42 and the holding member 43 are joined. Note that the lower surface of the opening 44b is formed on the inclined surface 44c so that the adhesive S can be easily injected, and in the case of a UV adhesive, light can be easily irradiated. Then, after the adhesive is solidified, the adjustment jig 44 is removed.

  Since the end 42c on the imaging surface side of the lens frame 42 is always located closer to the imaging surface than the end on the subject side of the holding member 43, foreign matter is introduced from the gap between the lens frame 42 and the holding member 43. There is no infiltration.

  With the configuration as described above, the outer periphery of the adjustment jig 44 having a sufficient length in the axial direction can be gripped and rotated during focus adjustment. Therefore, the adjustment jig 44 is very easy to rotate. It is easy to automate gripping and rotating with an arm. Further, since the bonding position can be made constant at all times, automation of the injection of the adhesive S is easy. Further, for example, the radius can be set to 3.7 mm as shown in FIG. 8, and the outer diameter can be made smaller than that of the lens adjusting mechanism as shown in FIG.

It is an example of a lens adjustment mechanism. It is sectional drawing of 1st Embodiment of a lens adjustment mechanism. It is a principal part perspective view of 1st Embodiment of a lens adjustment mechanism. It is sectional drawing of 2nd Embodiment of a lens adjustment mechanism. It is a principal part perspective view of 2nd Embodiment of a lens adjustment mechanism. It is sectional drawing of 3rd Embodiment of a lens adjustment mechanism. It is a principal part perspective view of 3rd Embodiment of a lens adjustment mechanism. It is sectional drawing of 4th Embodiment of a lens adjustment mechanism. It is a principal part perspective view of 4th Embodiment of a lens adjustment mechanism.

Explanation of symbols

1,11,21,31,41 Imaging lens 2,12,22,32,42 Lens frame 2a, 12a, 22c Male thread 4,14,23,33,43 Holding member 4a, 13a, 24a Female thread 5,15 , 25, 35, 45 Image sensor 13 Lens barrel 22b, 32a, 42b Protruding part 23b, 33a, 43a Long groove 24, 34, 44 Adjustment jig 32b, 44a Cam pin 34a, 42a Cam groove O Optical axis S Adhesive

Claims (16)

A lens frame that holds the imaging lens, has an external thread on the outer peripheral surface, and has a protruding portion that protrudes toward the imaging surface by the imaging lens in the optical axis direction of the imaging lens;
A holding member having a guide portion for guiding the protruding portion in the optical axis direction;
A lens barrel having a female screw threadedly engaged with a male screw of the lens frame on the inner peripheral surface;
With
The lens frame is moved straight in the optical axis direction via the female screw and the male screw by rotating the lens barrel while the end of the lens barrel on the imaging surface side is in contact with the holding member. And adjusting the position of the imaging lens. Provide a concave portion in which a part of the male screw is cut out on the subject side surface of the lens frame;
After adjusting the imaging lens, an adhesive is injected into the recess to join the lens frame and the lens barrel, and the object side end of the lens barrel and the holding member are joined with the adhesive. The lens adjustment mechanism according to claim 1. Holding the imaging lens, and having a protruding portion protruding from the first outer peripheral surface in a direction orthogonal to the optical axis of the imaging lens, and having an external thread on the arc-shaped second outer peripheral surface of the protruding portion A lens frame,
A holding member that has a guide portion that fits with the first outer peripheral surface on the inner peripheral surface, and that slides on the side wall in the optical axis direction of the protruding portion and engages with the protruding portion;
An adjustment jig having a female screw threadably engaged with the male screw;
With
By screwing the female screw of the adjustment jig into the male screw of the lens frame and rotating the adjustment jig at a fixed position, the lens frame is moved in the optical axis direction via the female screw and the male screw. A lens adjustment mechanism that adjusts the position of the imaging lens by linearly moving. After the adjustment of the imaging lens, the end of the lens frame on the imaging plane side by the imaging lens is always located closer to the imaging plane than the end of the holding member on the imaging plane side. The lens adjusting mechanism according to claim 3. A concave portion formed by cutting out a part of the first outer peripheral surface is provided on the subject side surface of the lens frame;
The lens adjustment mechanism according to claim 3 or 4, wherein after the adjustment of the imaging lens, an adhesive is injected into the concave portion to join the lens frame and the holding member. The lens adjustment mechanism according to claim 5, wherein a gap formed by an end portion on the imaging surface side of the projecting portion and the guide portion of the holding member is sealed with an adhesive. The lens adjustment mechanism according to claim 5 or 6, wherein the adjustment jig is removed after the adhesive is solidified. A lens frame that holds the imaging lens and has a protruding portion that protrudes from the outer peripheral surface in a direction orthogonal to the optical axis of the imaging lens, and a cam pin that protrudes from the protruding portion in a direction orthogonal to the optical axis;
A holding member that has a guide portion that fits with the outer peripheral surface of the lens frame at the inner peripheral surface and that slidably contacts the side wall in the optical axis direction of the protruding portion and engages with the protruding portion;
An adjustment jig having a cam groove that engages with the cam pin on the inner peripheral surface;
With
By engaging the cam groove of the adjustment jig with the cam pin of the lens frame and rotating the adjustment jig at a fixed position, the lens frame moves straight in the optical axis direction via the cam groove and the cam pin. And adjusting the position of the imaging lens. After the adjustment of the imaging lens, the end of the lens frame on the imaging plane side by the imaging lens is always located closer to the imaging plane than the end of the holding member on the imaging plane side. The lens adjusting mechanism according to claim 8. Provide a concave portion in which a part of the outer peripheral surface is cut out on the subject side surface of the lens frame;
10. The lens adjustment mechanism according to claim 8, wherein after the adjustment of the imaging lens, an adhesive is injected into the concave portion to join the lens frame and the holding member. The lens adjustment mechanism according to claim 10, wherein an air gap formed between an end portion on the imaging surface side of the projecting portion and the guide portion of the holding member is sealed with an adhesive. The lens adjustment mechanism according to claim 10 or 11, wherein the adjustment jig is removed after the adhesive is solidified. A lens frame that holds the imaging lens, has a cam groove on the outer peripheral surface, and has a protruding portion that protrudes toward the imaging surface side of the imaging lens in the optical axis direction of the imaging lens, and the protruding portion. A holding member having a guide for guiding in the optical axis direction;
An adjustment jig having a cam pin that engages with the cam groove on the inner peripheral surface;
With
By engaging the cam pin of the adjustment jig with the cam groove of the lens frame and rotating the adjustment jig while bringing the end of the adjustment jig on the imaging surface side into contact with the holding member, A lens adjustment mechanism for adjusting the position of the imaging lens by moving the lens frame linearly in the optical axis direction of the imaging lens via the cam pin and the cam groove. An opening is provided by cutting out the outer peripheral surface of the adjustment jig,
The lens adjustment mechanism according to claim 13, wherein after the adjustment of the imaging lens, an adhesive is injected from the opening to join the lens frame and the holding member. The lens adjustment mechanism according to claim 14, wherein the adjustment jig is removed after the adhesive is solidified. An image sensor that forms a subject image with the imaging lens;
The lens adjustment mechanism according to any one of claims 1 to 15,
An imaging apparatus comprising:

Images