JP2019184653A - Imaging device - Google Patents

Abstract

To provide an imaging device with which, even when a metal thread-forming member for adjusting the inclination of the imaging plane of an imaging element relative to the optical axis of a lens is fixed to a plastic lens barrel for holding the lens, it is possible to prevent the lens barrel from cracking when the thread-forming member is fixed to the lens barrel.SOLUTION: This imaging device comprises a plastic lens barrel 3, an element holder 5 for holding an imaging element, and a plurality of adjustment mechanisms 7 for adjusting the inclination of the imaging plane of the imaging element relative to the optical axis of a lens. The adjustment mechanisms 7 include a metal thread-forming member 8 in which a female thread 8a is formed and which is fixed to the lens barrel 3, a screw 9 for adjustment that is inserted through the element holder 5 in the optical axis direction and screwed into the female thread 8a, and an urging member 11 for urging the element holder 5 to one side of the lens barrel 3 in the optical axis direction. An insertion hole 3d into which the thread-forming member 8 is inserted is formed in the lens barrel 3, and the thread-forming member 8 is fixed to the lens barrel 3 by a screw 10 for fixation.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an imaging apparatus including a lens and an imaging element.

  2. Description of the Related Art Conventionally, an imaging apparatus including a lens unit having a lens and a sensor assembly having an imaging element is known (see, for example, Patent Document 1). The imaging device described in Patent Literature 1 includes an adjustment screw member for adjusting the inclination of the imaging surface of the image sensor with respect to the optical axis of the lens, and a fixing screw for fixing the sensor assembly to the adjustment screw member. . The sensor assembly includes a sensor plate to which the image sensor is fixed, and a sensor substrate on which the image sensor fixed to the sensor plate is mounted. The sensor plate has a mounting hole through which the shaft of the fixing screw is inserted.

  In the imaging apparatus described in Patent Document 1, the adjustment screw member is formed in a stepped columnar shape, and includes a large-diameter portion and a small-diameter portion whose outer diameter is smaller than the large-diameter portion. The adjusting screw member is made of metal. On the small diameter part side, a female screw into which a fixing screw is screwed is formed. A male screw is formed on the outer peripheral surface of the large-diameter portion. The lens unit is formed with a mounting hole into which the large diameter portion of the adjusting screw member is screwed. The part of the lens unit where the assembly hole is formed is made of resin. The outer diameter of the large diameter portion of the adjustment screw member is slightly larger than the inner diameter of the mounting hole.

  In the imaging device described in Patent Literature 1, when the large diameter portion of the adjustment screw member is incorporated into the assembly hole, a female screw is formed on the inner peripheral surface of the assembly hole. That is, a female thread is formed on the inner peripheral surface of the mounting hole by self-tapping. In the imaging apparatus described in Patent Document 1, the inclination of the imaging surface of the imaging element with respect to the optical axis of the lens is adjusted by turning the adjustment screw member with the fixing screw loosened.

JP 2017-44936 A

  In the imaging device described in Patent Document 1, the adjustment screw member is made of metal, and the portion of the lens unit in which the assembly hole is formed is made of resin. In this imaging apparatus, the outer diameter of the large diameter portion of the adjustment screw member incorporated in the assembly hole of the lens unit is larger than the inner diameter of the assembly hole. Therefore, in the imaging device described in Patent Document 1, when the large-diameter portion of the adjustment screw member is incorporated into the assembly hole, an external force spreading outward in the radial direction of the assembly hole acts on the inner peripheral surface of the assembly hole. As a result, the portion of the lens unit in which the assembly hole is formed may break.

  Then, even if the metal screw forming member for adjusting the inclination of the imaging surface of the imaging device with respect to the optical axis of the lens is fixed to the resin lens barrel that holds the lens, An object of the present invention is to provide an imaging device capable of preventing the lens barrel from cracking when the screw forming member is fixed to the lens barrel.

  In order to solve the above problems, an imaging apparatus according to the present invention includes a resin lens barrel that holds a lens, and an element holder that holds the imaging element and is attached to one end of the lens barrel in the optical axis direction of the lens. And a plurality of adjustment mechanisms for adjusting the inclination of the imaging surface of the imaging device with respect to the optical axis of the lens, and the adjustment mechanism is formed of a metal screw forming member in which a female screw is formed and fixed to the lens barrel And an adjustment screw that is inserted through the element holder in the optical axis direction and screwed into the female screw, and a biasing member that biases the element holder toward one side in the optical axis direction with respect to the lens barrel. An insertion hole into which a screw forming member is inserted is formed in the lens barrel, and the screw forming member is fixed to the lens barrel with a fixing screw or an adhesive.

  In the image pickup apparatus of the present invention, the adjustment mechanism for adjusting the inclination of the image pickup surface of the image pickup element with respect to the optical axis of the lens includes a metal screw forming member fixed to the lens barrel, and is made of a resin lens. The lens barrel is formed with an insertion hole into which a screw forming member is inserted. In the present invention, the screw forming member is fixed to the lens barrel with a fixing screw or an adhesive. Therefore, in the present invention, even if the inner diameter of the insertion hole is equal to the outer diameter of the screw forming member, or the inner diameter of the insertion hole is larger than the outer diameter of the screw forming member, the screw is attached to the lens barrel. It becomes possible to fix the forming member. Therefore, in the present invention, the screw forming member can be inserted into the insertion hole and fixed to the lens barrel so that the external force spreading outward in the radial direction of the insertion hole does not act on the inner peripheral surface of the insertion hole. . As a result, in the present invention, even when the metal screw forming member is fixed to the resin lens barrel, it is possible to prevent the lens barrel from cracking when the screw forming member is fixed to the lens barrel. become.

  Since the amount of adjustment of the tilt of the imaging surface when adjusting the tilt of the imaging surface of the image sensor is not large, the pitch of the female screw of the screw forming member and the male screw of the adjusting screw for adjusting the tilt of the imaging surface is inevitably Become smaller. Screws with a small pitch are vulnerable to wear. In particular, if a male screw formed on a metal part is screwed into a female screw formed on a resin part and the screw is tightened, the thread of the female screw may be crushed by friction with the male screw. There is. However, in the present invention, since the screw forming member on which the female screw is formed is made of metal, the screw forming member can be adjusted by repeatedly adjusting the inclination of the imaging surface by loosening the screw forming member and the adjusting screw. It is possible to prevent the screw thread of the female screw from being crushed.

  In the present invention, a gap is preferably formed between the inner peripheral surface of the insertion hole and the outer peripheral surface of the screw forming member. If comprised in this way, when inserting a screw formation member in an insertion hole, the external force which spreads on the outer side of the radial direction of an insertion hole does not act on the internal peripheral surface of an insertion hole. Therefore, it is possible to reliably prevent the lens barrel from cracking when the screw forming member is fixed to the lens barrel.

  In the present invention, the screw forming member is fixed to the lens barrel by a fixing screw, and the shaft portion of the fixing screw is inserted into the lens barrel in the optical axis direction and the inner diameter is smaller than the inner diameter of the insertion hole. In addition, a small-diameter hole connected to the insertion hole in the optical axis direction is formed, an adjustment screw is screwed to one end side of the screw forming member in the optical axis direction, and a fixing screw is screwed to the other end side of the screw forming member in the optical axis direction It is preferable that they are screwed together. If comprised in this way, compared with the case where the screw formation member is being fixed to the lens barrel with the adhesive agent, the fixation operation | work of the screw formation member to a lens barrel will become easy. In addition, since the insertion hole and the small-diameter hole are connected in the optical axis direction when configured in this way, compared to the case where the small-diameter hole is connected to the insertion hole in the direction orthogonal to the optical axis direction, It becomes possible to simplify the structure of the metal mold | die for manufacturing a lens-barrel.

  In the present invention, a planar boundary surface orthogonal to the optical axis direction is formed at the boundary between the insertion hole and the small diameter hole, and one end surface of the screw forming member in the optical axis direction is in contact with the boundary surface Is preferred. If comprised in this way, it will become possible to position a screw formation member in an optical axis direction with a boundary surface. Also, with this configuration, since the boundary surface is orthogonal to the optical axis direction, when one end surface of the screw forming member comes into contact with the boundary surface, an external force spreading outward in the radial direction of the insertion hole is Does not act on the inner peripheral surface of the. Therefore, it is possible to effectively prevent the lens barrel from cracking when the screw forming member is fixed to the lens barrel.

  When the boundary surface is not orthogonal to the optical axis direction and is a tapered surface inclined with respect to the direction orthogonal to the optical axis direction, the screw forming member is tightened by tightening the fixing screw. When one end surface comes into contact with the boundary surface with a predetermined contact pressure, an external force spreading outward in the radial direction of the insertion hole acts on the inner peripheral surface of the insertion hole. Therefore, in this case, as the fixing screw is tightened, a large external force spreading outward in the radial direction of the insertion hole acts on the inner peripheral surface of the insertion hole, and the lens barrel may be cracked. Further, one end surface of the screw forming member that contacts the boundary surface may be formed so that an external force spreading outward in the radial direction of the insertion hole does not act on the inner peripheral surface of the insertion hole. It is preferable to form in the shape of an orthogonal plane.

  In the present invention, the tightening torque of the fixing screw with respect to the screw forming member is preferably larger than the rotational torque of the adjusting screw with respect to the screw forming member. With this configuration, it is possible to prevent loosening of the fixing screw when the adjustment screw is rotated.

  In the present invention, the lens barrel is formed with, for example, a flat surface perpendicular to the optical axis direction and a screw contact surface with which the head of the fixing screw contacts. In this case, since the screw contact surface, which is the surface with which the fixing screw head contacts, is a plane perpendicular to the optical axis direction, the fixing screw head contacts the screw contact surface with a predetermined contact pressure. However, the external force spreading outward in the radial direction of the insertion hole does not act on the inner peripheral surface of the insertion hole. Therefore, it is possible to effectively prevent the lens barrel from cracking when the screw forming member is fixed to the lens barrel.

  When the screw contact surface is not orthogonal to the optical axis direction but is a tapered surface inclined with respect to the direction orthogonal to the optical axis direction, the fixing screw is tightened by tightening the fixing screw. When the head portion of the screw contacts the screw contact surface with a predetermined contact pressure, an external force spreading outward in the radial direction of the insertion hole acts on the inner peripheral surface of the insertion hole. Therefore, in this case, as the fixing screw is tightened, a large external force spreading outward in the radial direction of the insertion hole acts on the inner peripheral surface of the insertion hole, and the lens barrel may be cracked. In addition, the seating surface of the fixing screw (the surface of the fixing screw head that faces the screw contact surface) is formed so that the external force spreading outward in the radial direction of the insertion hole does not act on the inner peripheral surface of the insertion hole. For example, it is preferably formed in a planar shape orthogonal to the optical axis direction.

  In the present invention, it is preferable that the screw forming member includes a rotation preventing portion for preventing the screw forming member from rotating with the optical axis direction as the rotation axis direction. With this configuration, it is possible to prevent the screw forming member from rotating together when the adjusting screw is rotated.

  In the present invention, the rotation preventing portion is, for example, a polygonal flat plate-shaped flange portion extending in a direction orthogonal to the optical axis direction.

  In this invention, it is preferable that the whole screw formation member is arrange | positioned in the insertion hole. If comprised in this way, it will become possible to suppress the fall of the screw formation member with respect to an optical axis direction.

  As described above, in the imaging apparatus of the present invention, the metal screw forming member for adjusting the inclination of the imaging surface of the imaging element with respect to the optical axis of the lens is fixed to the resin lens barrel that holds the lens. Even in this case, it is possible to prevent the lens barrel from cracking when the screw forming member is fixed to the lens barrel.

It is a perspective view of the imaging device concerning an embodiment of the invention. FIG. 2 is a perspective view of a state where an imaging element, an element holder, and the like are removed from the imaging apparatus illustrated in FIG. It is a perspective view of the screw formation member shown in FIG. It is sectional drawing of the EE cross section of FIG. 1 (A).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Schematic configuration of imaging device)
FIG. 1 is a perspective view of an imaging apparatus 1 according to an embodiment of the present invention. FIG. 2 is a perspective view of the imaging device 1 shown in FIG. 1B with the imaging element 4 and the element holder 5 removed.

  The imaging device 1 of this embodiment includes a lens 2, a lens barrel 3 that holds the lens 2, an imaging device 4 such as a C-MOS image sensor, and an element holder 5 that holds the imaging device 4. If one side of the optical axis direction (optical axis direction) of the lens 2 is the subject side and the other side of the optical axis direction is the anti-subject side (imaging side), the lens barrel 3 is disposed on the subject side. The element holder 5 is disposed on the side opposite to the subject. In the following description, the subject side (Z1 direction side in FIG. 1 and the like) is referred to as the “front” side, and the opposite subject side (Z2 direction side in FIG. 1 and the like) is referred to as the “rear” side.

  In addition, the imaging apparatus 1 includes a plurality of adjustment mechanisms 7 for adjusting the inclination of the imaging surface of the imaging element 4 with respect to the optical axis of the lens 2. The imaging apparatus 1 of this embodiment includes three adjustment mechanisms 7. The three adjustment mechanisms 7 are arranged at substantially the same angular interval with respect to the circumferential direction around the optical axis of the lens 2 when viewed from the front-rear direction. The three adjustment mechanisms 7 are arranged on the outer peripheral side of the image sensor 4 so as to surround the image sensor 4 when viewed from the front-rear direction.

  The adjusting mechanism 7 includes a screw forming member 8 formed with a female screw 8a and fixed to the lens barrel 3, an adjusting screw 9 screwed into the female screw 8a of the screw forming member 8, and the screw forming member 8 as a lens mirror. A fixing screw 10 for fixing to the tube 3 and an urging member for urging the element holder 5 to the other side (anti-subject side / rear side) of the lens barrel 3 in the optical axis direction (front-rear direction). The compression coil spring 11 is provided. A specific configuration of the adjustment mechanism 7 will be described later.

  The lens barrel 3 is made of resin. The lens barrel 3 is formed in a cylindrical shape, and the lens 2 is disposed on the inner peripheral side of the lens barrel 3. The lens barrel 3 includes a holding portion 3 a that holds the screw forming member 8. The holding portion 3 a protrudes outward in the radial direction from the side surface portion in the vicinity of the rear end portion of the lens barrel 3. In addition, the holding portions 3a are formed at three locations, and when viewed from the front-rear direction, the three holding portions 3a have substantially the same angle with respect to the circumferential direction around the optical axis of the lens 2. They are arranged at intervals. Further, the three holding portions 3 a are arranged on the outer peripheral side of the image sensor 4 so as to surround the image sensor 4 when viewed from the front-rear direction. A specific configuration of the holding unit 3a will be described later.

  The element holder 5 is made of resin. The element holder 5 is formed in a rectangular flat plate shape, and is arranged so that the thickness direction of the element holder 5 matches the front-rear direction. In the center of the element holder 5, a rectangular through hole 5 a in which the imaging element 4 is disposed is formed. The element holder 5 is attached to the rear end portion of the lens barrel 3. That is, the element holder 5 is attached to the other side (on the opposite subject side / rear side) of the lens barrel 3 in the optical axis direction.

  The element holder 5 is formed with a through hole 5b (see FIG. 4) through which the adjustment screw 9 is inserted. The through hole 5b is a round hole that penetrates the element holder 5 in the front-rear direction. The through holes 5b are formed in three places. When viewed from the front-rear direction, the three through holes 5 b are arranged at positions corresponding to the holding portions 3 a of the lens barrel 3. Specifically, the three through holes 5 b are arranged at substantially the same angular interval with respect to the circumferential direction centering on the optical axis of the lens 2. Further, the three through holes 5b are arranged on the outer peripheral side of the image pickup element 4 so as to surround the image pickup element 4 when viewed from the front-rear direction. The inner diameter of the through hole 5b is larger than the outer diameter of the shaft portion 9a (see FIG. 4) of the adjusting screw 9. Further, the inner diameter of the through hole 5b is smaller than the outer diameter of the head 9b of the adjusting screw 9. The shaft portion 9a of the adjusting screw 9 is inserted into the through hole 5b from the rear side.

(Configuration of adjustment mechanism and holding part)
FIG. 3 is a perspective view of the screw forming member 8 shown in FIG. FIG. 4 is a cross-sectional view taken along the line EE of FIG.

  The front surface and the rear surface of the holding portion 3a of the lens barrel 3 are flat surfaces orthogonal to the front-rear direction (optical axis direction). The holding portion 3a is formed with a through hole 3b that penetrates the holding portion 3a in the front-rear direction. The rear half of the holding portion 3a is a cylindrical portion 3c formed in a substantially cylindrical shape. The cylindrical part 3c is arranged so that the axial direction of the cylindrical part 3c and the front-rear direction coincide. The cylindrical portion 3 c is disposed on the inner peripheral side of the compression coil spring 11.

  The through hole 3b includes an insertion hole 3d into which the screw forming member 8 is inserted, and a small diameter hole 3e having an inner diameter smaller than the inner diameter of the insertion hole 3d. That is, the lens barrel 3 is formed with an insertion hole 3d into which the screw forming member 8 is inserted. The insertion hole 3d and the small diameter hole 3e are connected in the front-rear direction (optical axis direction). The length of the insertion hole 3d in the front-rear direction is longer than the length of the small-diameter hole 3e in the front-rear direction. For example, the length of the insertion hole 3d in the front-rear direction is about five times the length of the small-diameter hole 3e in the front-rear direction. By making the length of the insertion hole 3d sufficiently longer than the length of the small diameter hole 3e, it is possible to secure a sufficient length of the screw forming member 8 inserted into the insertion hole 3d. Further, by securing a sufficient length of the screw forming member 8 to be inserted into the insertion hole 3d, it is possible to secure the screwing amount of the adjusting screw 9, the fixing screw 10 and the screw forming member 8. become.

  The small-diameter hole 3e is a round hole having a circular inner peripheral surface when viewed from the front-rear direction. The inner diameter of the small diameter hole 3 e is larger than the outer diameter of the shaft portion 10 a of the fixing screw 10. Further, the inner diameter of the small-diameter hole 3e is smaller than the outer diameter of the head 10b of the fixing screw 10. The insertion hole 3d includes a first insertion hole 3f having a circular inner peripheral surface when viewed from the front-rear direction and a second insertion hole 3g having a square inner peripheral surface when viewed from the front-rear direction. It consists of and. The first insertion hole 3f and the second insertion hole 3g are connected in the front-rear direction (optical axis direction). The length of the first insertion hole 3f in the front-rear direction is longer than the length of the second insertion hole 3g in the front-rear direction. For example, the length of the first insertion hole 3f in the front-rear direction is about four times the length of the second insertion hole 3g in the front-rear direction.

  As will be described later, the inner dimension (one side dimension) of the second insertion hole 3g is formed larger than the inner diameter of the first insertion hole 3f. Therefore, by making the length of the first insertion hole 3f in the front-rear direction sufficiently longer than the length of the second insertion hole 3g in the front-rear direction, the ratio of the second insertion hole 3g to the first insertion hole 3f is reduced. As a result, it is possible to secure the thickness in the radial direction of the holding portion 3a and suppress the decrease in the strength of the holding portion 3a.

  The first insertion hole 3f is disposed on the front side of the second insertion hole 3g, and the small diameter hole 3e is disposed on the front side of the first insertion hole 3f. When viewed from the front-rear direction, the center of the small diameter hole 3e, the center of the first insertion hole 3f, and the center of the second insertion hole 3g coincide. At the boundary between the first insertion hole 3f and the small diameter hole 3e (that is, the boundary between the insertion hole 3d and the small diameter hole 3e), a planar boundary surface 3h orthogonal to the front-rear direction (optical axis direction) is formed. . The boundary surface 3h is formed in an annular shape. Further, when viewed from the front-rear direction, the length of one side of the second insertion hole 3g having a square shape is larger than the diameter of the first insertion hole 3f. That is, the inner dimension of the second insertion hole 3g is larger than the inner diameter of the first insertion hole 3f.

  The screw forming member 8 is made of metal. The screw forming member 8 is formed in a cylindrical shape with a flange having a cylindrical cylindrical portion 8b and a flange portion 8c connected to one end of the cylindrical portion 8b. The screw forming member 8 is disposed so that the axial direction of the cylindrical portion 8b coincides with the front-rear direction. The above-described female screw 8 a is formed on the inner peripheral surface of the screw forming member 8. In this embodiment, female threads 8a are formed on the entire inner peripheral surface of the screw forming member 8 in the front-rear direction. The outer diameter of the cylindrical portion 8b is larger than the inner diameter of the small diameter hole 3e. Further, the outer diameter of the cylindrical portion 8b is slightly smaller than the inner diameter of the first insertion hole 3f and larger than the inner diameter of the small diameter portion 3e. The inner diameter of the screw forming member 8 on which the female screw 8a is formed is smaller than the inner diameter of the small diameter hole 3e.

  The flange portion 8c is connected to the rear end of the cylindrical portion 8b. The flange portion 8c is formed in a polygonal flat plate shape extending from the rear end of the cylindrical portion 8b in the radial direction of the cylindrical portion 8b (that is, the direction orthogonal to the optical axis direction). Specifically, the flange portion 8c is formed in a substantially square flat plate shape. The length of one side of the flange portion 8c formed in a substantially square is slightly shorter than the length of one side of the second insertion hole 3g in which the shape of the inner peripheral surface when viewed from the front-rear direction is a square shape. .

  The screw forming member 8 is fixed to the holding portion 3 a by a fixing screw 10. That is, the screw forming member 8 is fixed to the lens barrel 3 by the fixing screw 10. The shaft portion 10a of the fixing screw 10 is inserted through the small diameter hole 3e from the front side. That is, the shaft portion 10a of the fixing screw 10 is inserted through the small diameter hole 3e in the front-rear direction (optical axis direction). The male screw formed on the outer peripheral surface of the shaft portion 10 a of the fixing screw 10 is screwed into the female screw 8 a formed on the inner peripheral surface of the screw forming member 8. Specifically, the male screw of the shaft portion 10 a is screwed into the female screw 8 a of the front end side portion of the screw forming member 8.

  A screw lock, which is an adhesive for preventing loosening, is applied between the male screw of the shaft portion 10a and the female screw 8a. Since the fixing screw 10 is fixed to the screw forming member 8 by the screw lock, in this embodiment, the tightening torque of the fixing screw 10 is larger than the rotational torque of the adjusting screw 9. Further, since the tightening torque of the fixing screw 10 is larger than the rotational torque of the adjusting screw 9, even if the screwing amount of the adjusting screw 9 is adjusted when adjusting the tilt of the image sensor 4, the fixing screw 10. There is no possibility that the screwing of the screw forming member 8 will be loosened.

  The rear surface of the head portion 10b of the fixing screw 10 is in contact with the front surface of the holding portion 3a that is a plane orthogonal to the front-rear direction, and the front end portion of the shaft portion 10a is disposed in the small diameter hole 3e. The front surface of the holding portion 3a of this embodiment is a screw contact surface 3j that is formed in a planar shape orthogonal to the front-rear direction (optical axis direction) and contacts the head 10b of the fixing screw 10.

  The front end surface of the screw forming member 8 fixed to the holding portion 3a is in contact with the boundary surface 3h. That is, one end surface of the screw forming member 8 in the front-rear direction (optical axis direction) is in contact with the boundary surface 3h. The entire screw forming member 8 fixed to the holding portion 3a is disposed in the insertion hole 3d. In this embodiment, the rear end of the screw forming member 8 is disposed slightly in front of the rear end of the insertion hole 3d. The flange portion 8c of the screw forming member 8 is disposed in the second insertion hole 3g. Most of the cylindrical portion 8b excluding the rear end portion of the cylindrical portion 8b is disposed in the first insertion hole 3f. In this embodiment, the screw forming member 8 is inserted into the insertion hole 3d from the rear side of the insertion hole 3d. As described above, since the inner diameter of the second insertion hole 3g is larger than the inner diameter of the first insertion hole 3f, in this embodiment, the screw forming member 8 is inserted into the insertion hole 3d from the rear side of the insertion hole 3d. It has become easier.

  With the above configuration, when the screw forming member 8 is fixed to the lens barrel 3 with the fixing screw 10, the lens barrel 3 is in contact with the front end surface of the screw forming member 8 and the boundary surface 3 h. The inclination of the screw forming member 8 with respect to is regulated. When the front end surface of the screw forming member 8 and the boundary surface 3h are in contact with each other, the upper surface of the flange portion 8c and the surface facing the lower side of the second insertion hole 3g facing the upper surface of the flange portion 8c. A gap is formed between the two. Therefore, the front end surface of the screw forming member 8 and the boundary surface 3h can be reliably brought into contact with each other.

  In addition, since the screw forming member 8 is disposed in the insertion hole 3d, the screw forming member 8 is roughly positioned with respect to the lens barrel 3. Further, by supporting the screw forming member 8 with the inner peripheral surface of the insertion hole 3d, the tilting and tilting of the screw forming member 8 are suppressed such that the fixing with the fixing screw 10 becomes difficult. Therefore, when the screw forming member 8 is fixed to the lens barrel 3 by the fixing screw 10, the screw forming member 8 and the holding portion 3a can be smoothly fixed by the fixing screw 10. Yes.

  As described above, the outer diameter of the cylindrical portion 8b is slightly smaller than the inner diameter of the first insertion hole 3f, so that the gap between the outer peripheral surface of the cylindrical portion 8b and the inner peripheral surface of the first insertion hole 3f is small. A slight gap is formed. In this embodiment, a dimensional tolerance gap is formed between the outer peripheral surface of the cylindrical portion 8b and the inner peripheral surface of the first insertion hole 3f. Specifically, the cylindrical portion 8b is formed with the upper limit of the tolerance set in the outer diameter size of the cylindrical portion 8b of the screw forming member 8, and is set to the inner diameter size of the inner peripheral surface of the first insertion hole 3f. The outer diameter of the cylindrical portion 8b and the inner diameter of the first insertion hole 3f are prevented so that the screw forming member 8 is not press-fitted into the first insertion hole 3f even if the first insertion hole 3f is formed with the lower limit of the tolerance. Is set.

  Further, as described above, since the length of one side of the flange portion 8c is slightly shorter than the length of one side of the second insertion hole 3g, the cylindrical portion 8b disposed in the second insertion hole 3g. A gap is formed between the outer peripheral surface of the rear end portion and the outer peripheral surface of the flange portion 8c and the inner peripheral surface of the second insertion hole 3g. That is, in this embodiment, a gap is formed between the inner peripheral surface of the insertion hole 3 d and the outer peripheral surface of the screw forming member 8.

  With the above configuration, it is not necessary to press-fit the screw forming member 8 into the insertion hole 3d, and it is possible to suppress damage to the holding portion 3a. Incidentally, since the first insertion hole 3f is also used for rough positioning of the cylindrical portion 8b in the direction orthogonal to the optical axis direction, the gap between the cylindrical portion 8d and the first insertion hole 3f is a dimension. In the range in which the tolerance gap can be formed, it is preferable that the gap is as small as possible. On the other hand, since the 2nd insertion hole 3g is used as rotation control of the collar part 8c, the inner dimension (one side dimension) of the 2nd insertion hole 3g should just be smaller than the largest dimension of the collar part 8c.

  The clearance between the outer diameter of the male screw 10a of the fixing screw 10 and the inner diameter of the small-diameter portion 3e is such that the male screw 10a and the small-diameter portion 3e are adjusted when the screwing amount between the fixing screw 10 and the screw forming member 8 is adjusted. It is formed large enough not to touch. Therefore, in the three gaps, the gap between the cylindrical portion 8b and the first insertion hole 3f is formed smaller than the other two gaps. By forming a small gap between the cylindrical portion 8b and the first insertion hole 3f, the screw forming member 8 before being fixed by the fixing screw 10 can be tilted or misaligned inside the first insertion hole 3f. Can be suppressed. The length of the first insertion hole 3f in the optical axis direction is longer than the length of the small diameter portion 3e in the optical axis direction and the length of the second insertion hole 3g in the optical axis direction. By forming the gap between the cylindrical portion 8b and the first insertion hole 3f to be smaller than the two gaps, it is possible to further suppress the inclination during positioning.

  The flange portion 8c disposed in the second insertion hole 3g functions to prevent the screw forming member 8 from rotating, with the front-rear direction being the axial direction of rotation. The flange portion 8c of the present embodiment is a rotation preventing portion for preventing the screw forming member 8 from rotating with the front-rear direction (optical axis direction) as the axis direction of rotation.

  As described above, the shaft portion 9 a of the adjustment screw 9 is inserted into the through hole 5 b of the element holder 5 from the rear side. That is, the adjustment screw 9 is inserted through the element holder 5 in the front-rear direction (optical axis direction). The front surface of the head portion 9b of the adjusting screw 9 is in contact with the rear surface of the element holder 5, and the rear end portion of the shaft portion 9a is disposed in the through hole 5b. The male screw formed on the outer peripheral surface of the shaft portion 9 a of the adjusting screw 9 is screwed into the female screw 8 a formed on the inner peripheral surface of the screw forming member 8. Specifically, the male screw of the shaft portion 9 a is screwed into the female screw 8 a on the rear end side portion of the screw forming member 8.

  As described above, the male screw 8a of the shaft portion 9a is screwed into the female screw 8a at the rear end side portion of the screw forming member 8, and as described above, the female screw 8a at the front end side portion of the screw forming member 8 is fixed to the female screw 8a. The male screw of the shaft portion 10a of the screw 10 is screwed. That is, in this embodiment, the adjustment screw 9 is screwed to one end side of the screw forming member 8 in the front-rear direction (optical axis direction), and is fixed to the other end side of the screw forming member 8 in the front-rear direction (optical axis direction). The screw 10 is screwed.

  As described above, the cylindrical portion 3 c is disposed on the inner peripheral side of the compression coil spring 11. The rear end of the compression coil spring 11 is in contact with the front surface of the element holder 5, and the front end of the compression coil spring 11 is in contact with an annular step surface 3k formed in the cylindrical portion 3c. The step surface 3k is a substantially annular plane orthogonal to the front-rear direction. The compression coil spring 11 urges the element holder 5 backward with respect to the lens barrel 3. That is, the compression coil spring 11 urges the lens barrel 3 forward with respect to the element holder 5.

  In the imaging apparatus 1, the inclination of the imaging surface of the imaging element 4 with respect to the optical axis of the lens 2 is adjusted by adjusting the screwing amount of the adjustment screw 9 with respect to the screw forming member 8 by the three adjustment mechanisms 7. In this embodiment, as described above, the tightening torque of the fixing screw 10 with respect to the screw forming member 8 is larger than the rotational torque of the adjusting screw 9 with respect to the screw forming member 8.

(Main effects of this form)
As described above, the imaging apparatus 1 of the present embodiment includes the resin lens barrel 3 that holds the lens 2 and the one end side of the lens barrel 3 that holds the imaging element 4 and is in the optical axis direction of the lens 2. An element holder 5 to be attached and a plurality of adjustment mechanisms 7 for adjusting the inclination of the image pickup surface of the image pickup element 4 with respect to the optical axis of the lens 2 are provided. The adjusting mechanism 7 includes a metal screw forming member 8 in which a female screw 8a is formed and fixed to the lens barrel 3, and an adjusting screw that is inserted into the element holder 5 in the optical axis direction and screwed into the female screw 8a. 9 and a compression coil spring 11 that urges the element holder 5 toward one side in the optical axis direction with respect to the lens barrel 3. The lens barrel 3 is formed with an insertion hole 3 d into which the screw forming member 8 is inserted. The screw forming member 8 is fixed to the lens barrel 3 by a fixing screw 10.

  As described above, in this embodiment, the adjustment mechanism 7 for adjusting the inclination of the imaging surface of the imaging device 4 with respect to the optical axis of the lens 2 includes the metal screw forming member 8 fixed to the lens barrel 3. The resin lens barrel 3 is formed with an insertion hole 3d into which the screw forming member 8 is inserted. In this embodiment, the screw forming member 8 is fixed to the lens barrel 3 by the fixing screw 10. Therefore, in this embodiment, even if the inner diameter of the insertion hole 3d is larger than the outer diameter of the screw forming member 8, the screw forming member 8 can be fixed to the lens barrel 3. Therefore, in this embodiment, the screw forming member 8 is inserted into the insertion hole 3d and fixed to the lens barrel 3 so that the external force spreading outward in the radial direction of the insertion hole 3d does not act on the inner peripheral surface of the insertion hole 3d. It becomes possible. As a result, in this embodiment, even if the metal screw forming member 8 is fixed to the resin lens barrel 3, the lens barrel 3 is not cracked when the screw forming member 8 is fixed to the lens barrel 3. It becomes possible to prevent.

  It is preferable that a gap is formed between the inner peripheral surface of the insertion hole 3d and the outer peripheral surface of the screw forming member 8 as in this embodiment. In this way, when the screw forming member 8 is inserted into the insertion hole 3d, the external force spreading outward in the radial direction of the insertion hole 3d does not act on the inner peripheral surface of the insertion hole 3d. Therefore, it is possible to reliably prevent the lens barrel 3 from cracking when the screw forming member 8 is fixed to the lens barrel 3.

  As in the present embodiment, the screw forming member 8 is fixed to the lens barrel 3 by the fixing screw 10, and the shaft portion 10 a of the fixing screw 10 is inserted into the lens barrel 3 in the optical axis direction. A small-diameter hole 3e having an inner diameter smaller than the inner diameter of the hole 3d and connected to the insertion hole 3d in the optical axis direction is formed, and an adjustment screw 9 is screwed to one end side of the screw forming member 8 in the optical axis direction. It is preferable that the fixing screw 10 is screwed to the other end side of the screw forming member 8 in FIG. In this way, the screw forming member 8 can be fixed to the lens barrel 3 more easily than when the screw forming member 8 is fixed to the lens barrel 3 with an adhesive. Further, in this case, since the insertion hole 3d and the small diameter hole 3e are connected in the optical axis direction, compared to the case where the small diameter hole 3e is connected to the insertion hole 3d in a direction orthogonal to the optical axis direction, It is possible to simplify the configuration of the mold for manufacturing the resin lens barrel 3.

  As in this embodiment, a planar boundary surface 3h orthogonal to the optical axis direction is formed at the boundary between the insertion hole 3d and the small diameter hole 3e, and one end surface of the screw forming member 8 in the optical axis direction is the boundary surface 3h. It is preferable that it contacts. If it does in this way, it will become possible to position the screw formation member 8 in an optical axis direction with the boundary surface 3h. In this case, since the boundary surface 3h is orthogonal to the optical axis direction, an external force that spreads outward in the radial direction of the insertion hole 3d when one end surface of the screw forming member 8 contacts the boundary surface 3h. Does not act on the inner peripheral surface of the insertion hole 3d. Therefore, it is possible to effectively prevent the lens barrel 3 from cracking when the screw forming member 8 is fixed to the lens barrel 3.

  As in this embodiment, the tightening torque of the fixing screw 10 with respect to the screw forming member 8 is preferably larger than the rotational torque of the adjusting screw 9 with respect to the screw forming member 8. In this way, it is possible to prevent loosening of the fixing screw 10 when the adjusting screw 9 is rotated.

  As in this embodiment, it is preferable that the lens barrel 3 is formed with a screw contact surface 3j that is formed in a planar shape perpendicular to the optical axis direction and that contacts the head 10b of the fixing screw 10. In this way, when the head portion 10b of the fixing screw 10 comes into contact with the screw contact surface 3j, the external force spreading outward in the radial direction of the insertion hole 3d does not act on the inner peripheral surface of the insertion hole 3d. Therefore, it is possible to effectively prevent the lens barrel 3 from cracking when the screw forming member 8 is fixed to the lens barrel 3.

  As in the present embodiment, the screw forming member 8 preferably includes a flange portion 8c for preventing the screw forming member 8 from turning with the optical axis direction as the turning axial direction. In this way, it is possible to prevent the screw forming member 8 from rotating together when the adjusting screw 9 is rotated.

  As in this embodiment, it is preferable that the entire screw forming member 8 is disposed in the insertion hole 3d. If it does in this way, it will become possible to suppress the fall of the screw formation member 8 with respect to an optical axis direction.

(Other embodiments)
In the embodiment described above, the flange portion 8 c may not be formed on the screw forming member 8. In this case, since there is no distinction between the front and rear of the screw forming member 8, it is easy to insert the screw forming member 8 into the insertion hole 3d. In addition, when the flange portion 8c is not formed on the screw forming member 8, the entire screw forming member 8 may be formed in a polygonal column shape such as a substantially quadrangular column shape. In this case, the shape of the inner peripheral surface of the insertion hole 3 d when viewed from the front-rear direction is a polygonal shape corresponding to the shape of the screw forming member 8. Further, in this case, the entire screw forming member 8 serves as a rotation preventing portion for preventing the screw forming member 8 from rotating with the optical axis direction as the rotation axis direction.

  In the embodiment described above, the female screw 8a may not be formed on the entire inner peripheral surface of the screw forming member 8 in the front-rear direction. In this case, a female screw to which the fixing screw 10 is screwed is formed on the front end side of the inner peripheral surface of the screw forming member 8, and an adjustment screw is formed on the rear end side of the inner peripheral surface of the screw forming member 8. A female screw to which 9 is screwed is formed. In this case, even if the pitch of the female screw formed on the front end side of the inner peripheral surface of the screw forming member 8 is different from the pitch of the female screw formed on the rear end side of the inner peripheral surface of the screw forming member 8. good. The inner diameter on the front end side of the screw forming member 8 and the inner diameter on the rear end side of the screw forming member 8 may be different.

  In the embodiment described above, the small diameter hole 3e through which the shaft portion 10a of the fixing screw 10 is inserted may be connected to the insertion hole 3d in a direction orthogonal to the optical axis direction. That is, the fixing screw 10 may be arranged so that the direction orthogonal to the optical axis direction matches the axial direction of the shaft portion 10a. In this case, for example, a through hole penetrating the cylindrical portion 8b is formed in the radial direction of the cylindrical portion 8b of the screw forming member 8, and the male screw formed in the shaft portion 10a is formed on the inner peripheral surface of the through hole. Is formed.

  In the embodiment described above, the rear end of the screw forming member 8 is disposed behind the rear end of the insertion hole 3d, and a part of the rear end side of the screw forming member 8 is disposed in the insertion hole 3d. It is not necessary. In the embodiment described above, the outer diameter of the cylindrical portion 8b may be equal to the inner diameter of the first insertion hole 3f. Furthermore, in the embodiment described above, the biasing member that biases the element holder 5 backward with respect to the lens barrel 3 may be a spring member such as a tension coil spring or a leaf spring. In the embodiment described above, the screw forming member 8 may be fixed to the lens barrel 3 with an adhesive. That is, the screw forming member 8 inserted into the insertion hole 3d may be fixed to the lens barrel 3 with an adhesive.

  In the above-described embodiment, a plate spring for biasing the screw forming member 8 is disposed in the insertion hole 3d inside the radial direction of the insertion hole 3d, and the screw forming member 8 is moved to the lens by the biasing force of the plate spring. It is also possible to fix to the lens barrel 3. In the embodiment described above, the screw forming member 8 can be fixed to the outer peripheral surface of the lens barrel 3 with a fixing screw or an adhesive. Furthermore, in the embodiment described above, an insertion hole into which the screw forming member 8 is inserted is formed in the element holder 5, and the screw forming member 8 can be fixed to the element holder 5 by a fixing screw or an adhesive. . In this case, the adjustment screw 9 is inserted into the through hole formed in the holding portion 3 a from the front side, and the male screw of the adjustment screw 9 is screwed into the female screw 8 a of the screw forming member 8.

DESCRIPTION OF SYMBOLS 1 Image pick-up device 2 Lens 3 Lens barrel 3d Insertion hole 3e Small diameter hole 3h Boundary surface 3j Screw contact surface 4 Imaging element 5 Element holder 7 Adjustment mechanism 8 Screw formation member 8a Female screw 8c A collar (rotation prevention part)
9 Adjustment screw 10 Fixing screw 10a Shaft 11 Compression coil spring (biasing member)

Claims (9)

A resin lens barrel that holds the lens, an element holder that holds the imaging element and is attached to one end of the lens barrel in the optical axis direction of the lens, and imaging of the imaging element with respect to the optical axis of the lens A plurality of adjustment mechanisms for adjusting the inclination of the surface,
The adjustment mechanism includes a metal screw forming member that is formed with a female screw and is fixed to the lens barrel, and an adjustment screw that is inserted into the element holder in the optical axis direction and is screwed into the female screw. An urging member that urges the element holder toward the one side in the optical axis direction with respect to the lens barrel,
The lens barrel is formed with an insertion hole into which the screw forming member is inserted,
The imaging apparatus, wherein the screw forming member is fixed to the lens barrel by a fixing screw or an adhesive.   The imaging apparatus according to claim 1, wherein a gap is formed between an inner peripheral surface of the insertion hole and an outer peripheral surface of the screw forming member. The screw forming member is fixed to the lens barrel by the fixing screw,
The lens barrel is formed with a small-diameter hole through which the shaft portion of the fixing screw is inserted in the optical axis direction and having an inner diameter smaller than the inner diameter of the insertion hole and connected to the insertion hole in the optical axis direction. ,
The adjusting screw is screwed to one end side of the screw forming member in the optical axis direction, and the fixing screw is screwed to the other end side of the screw forming member in the optical axis direction. The imaging device according to claim 1 or 2. At the boundary between the insertion hole and the small diameter hole, a planar boundary surface perpendicular to the optical axis direction is formed,
The imaging apparatus according to claim 3, wherein one end surface of the screw forming member in the optical axis direction is in contact with the boundary surface.   The imaging apparatus according to claim 3 or 4, wherein a tightening torque of the fixing screw with respect to the screw forming member is larger than a rotational torque of the adjusting screw with respect to the screw forming member.   6. The lens barrel according to claim 3, further comprising: a screw contact surface that is formed in a planar shape perpendicular to the optical axis direction and that contacts a head of the fixing screw. The imaging device according to any one of the above.   The said screw formation member is provided with the rotation prevention part for preventing rotation of the said screw formation member which makes the said optical axis direction the axial direction of rotation. The imaging device described.   The imaging apparatus according to claim 7, wherein the rotation prevention unit is a polygonal flat plate-shaped eaves portion extending in a direction orthogonal to the optical axis direction.   The imaging device according to claim 1, wherein the entire screw forming member is disposed in the insertion hole.

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