JP2016102915A - Lens barrel, electronic apparatus and lens holding member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel capable of appropriately holding a plastic lens even when the plastic lens has a burr.SOLUTION: A mirror frame 3 for holding a lens 1 comprises: a groove 33 provided at an equal interval in a circumferential direction around the optical axis of the lens 1 and having an injected adhesive; a projection provided in the same phase as the groove 33 and projected in the optical axis direction and having an upper surface contacted with the lens thrust receiving surface 121 of a peripheral edge portion of the lens 1; a mirror frame radial receiving surface 32 fit with the lens radial receiving surface 122 of the outer peripheral surface of the lens 1; and a standing wall part 34 provided in the groove 33 so as to face a projection outer peripheral surface 311 and the lens radial receiving surface 122. In the lens 1, a burr 13 formed in a boundary between the lens thrust receiving surface 121 and the lens radial receiving surface 122 is not contacted with the mirror frame 3 by positioning the projection outer peripheral surface 311 on the inner peripheral side rather than the outer peripheral surface of the lens thrust receiving surface 121.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a lens barrel, an electronic device, and a lens holding member, and particularly to a lens barrel in which a plastic lens is incorporated.

  Various methods for bonding plastic lenses have been proposed for lens barrels incorporating plastic lenses. For example, in order to prevent the adhesive agent that deteriorates the optical performance of the plastic lens from entering the optical surface, there has been proposed a lens mounting structure in which a concave portion is provided at an adhesion site (see Patent Document 1).

Japanese Patent No. 3313265

  However, the technique described in Patent Document 1 does not have a lens mounting structure in consideration of burrs peculiar to plastic lenses. For this reason, if the plastic lens has burrs, the plastic lens may be tilted by the burrs, and the optical performance of the lens barrel may be degraded.

  An object of the present invention is to provide a lens barrel capable of appropriately bonding and holding a plastic lens even when the plastic lens has burrs.

  The lens barrel according to the present invention is a lens barrel including a plastic lens and a lens frame that holds the plastic lens, and the plastic lens is a peripheral portion of the plastic lens so as to be orthogonal to the optical axis. A lens thrust receiving surface provided on the outer peripheral surface of the plastic lens, and a lens radial receiving surface provided on the outer peripheral surface of the plastic lens. Provided at at least three locations, and located at the outer periphery of the peripheral edge of the plastic lens, and provided in the circumferential direction in phase with the groove, longer in the circumferential direction than the groove and in the direction of the optical axis A lens barrel radius that fits the convex portion projecting into the lens and the lens radial receiving surface to position the plastic lens in a direction perpendicular to the optical axis. And a standing wall provided on the groove so as to face the outer peripheral surface of the convex portion and the lens radial receiving surface, and the upper surface of the convex portion is in contact with the lens thrust receiving surface. The plastic lens is in contact with and positioned in the direction of the optical axis, and the outer peripheral surface of the convex portion is located on the inner peripheral side of the outer peripheral surface of the lens thrust receiving surface, and the plastic lens is positioned in the lens frame in the groove portion. It is characterized in that it is bonded with an adhesive.

  According to the present invention, even if the plastic lens has burrs, the plastic lens can be appropriately held in the lens barrel, thereby suppressing a decrease in optical performance of the lens barrel.

It is sectional drawing which shows schematic structure of the metal mold | die used for the plastic lens integrated in the lens-barrel which concerns on embodiment of this invention, and plastic lens shaping | molding. FIG. 2 is an external perspective view and an exploded perspective view of a lens barrel according to an embodiment of the present invention. FIG. 2 is a front view of a lens barrel according to an embodiment of the present invention as viewed from the subject side, and a cross-sectional view taken along line BB in the front view.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The lens barrel according to the present invention constitutes an imaging optical system of an electronic device having an imaging function. The light that has passed through the imaging optical system forms an image on an imaging device provided in the electronic device, and the optical image formed on the imaging device is converted into an electrical image signal by photoelectric conversion by the imaging device. Note that examples of the electronic device having an imaging function include a digital still camera, a digital video camera, a portable communication terminal with an imaging function, a portable computer with an imaging function, a portable game machine with an imaging function, and the like.

  FIG. 1A schematically shows a disk-shaped plastic lens 1 (hereinafter referred to as “lens 1”) incorporated in a lens barrel according to an embodiment of the present invention and a mold 2 used for molding the lens 1. FIG. It is sectional drawing which shows a structure. FIG. 1B is an enlarged view of the region A shown in FIG.

  In general, a method of incorporating a separate piece into a mold is often employed in a part where a surface requiring high surface accuracy is formed in the mold in order to facilitate adjustment or the like. Therefore, the mold 2 is composed of a fixed mold 21 and a movable mold 22, the fixed mold 21 is composed of a fixed mold body 211 and a fixed piece 212, and the movable mold 22 is movable. It consists of a mold body 221 and a movable side piece 222.

  The lens 1 includes a lens portion 11 that forms a lens surface for obtaining an optical function, and a peripheral portion 12 that is formed integrally with the lens portion 11 on the outer periphery of the lens portion 11 and holds the lens 1 inside the lens barrel. It consists of. The lens unit 11 has an R1 surface 111 and an R2 surface 112 which are front and back lens surfaces. Since both the R1 surface 111 and the R2 surface 112 require high surface accuracy, the R1 surface 111 and the R2 surface 112 are formed by the fixed side piece 212 and the movable side piece 222, respectively.

  A lens radial receiving surface 122 is formed on the outer peripheral surface of the peripheral edge portion 12 (that is, the outer peripheral surface of the lens 1). A lens thrust receiving surface 121 that abuts a lens barrel thrust receiving surface 31 described later is formed on one surface of the peripheral edge portion 12. The lens thrust receiving surface 121 is formed by the movable side piece 222 because high surface accuracy is required in order to ensure the positional accuracy of the lens 1 with respect to the lens frame 3 described later.

  Generally, in a molded product molded by a mold, burrs are generated at the boundary between the piece and the main body of the mold and the boundary between the main bodies. In the case of this embodiment, in the lens 1, the boundary portion between the fixed side piece 212 and the fixed side mold body 211, the boundary portion between the fixed side mold body 211 and the movable side mold body 221, and the movable side piece 222. A burr is generated at each of the boundary portions between the movable mold body 221 and the movable side mold body 221. A problem that arises when the lens 1 is brought into contact with the lens barrel thrust receiving surface 31 is the burr 13 generated at the boundary between the movable piece 222 and the movable mold body 221.

  FIG. 2A is a perspective view of the lens barrel 100 according to the embodiment of the present invention as viewed from the subject side. FIG. 2B is an exploded perspective view of the lens barrel 100 viewed from the subject side. The lens 1 is held by a lens frame 3 that is a lens holding member. The lens frame 3 includes a lens frame thrust receiving surface 31, a lens frame radial receiving surface 32, and a groove portion 33 for injecting an adhesive in a circumferential direction centering on an optical axis (not shown) of the lens barrel 100. It is provided at three places at equal intervals. Further, a standing wall portion 34 is provided in the vicinity of the position where the lens 1 is disposed in the groove portion 33.

  The lens barrel thrust receiving surface 31 and the groove 33 are provided in the same phase in the circumferential direction centered on the optical axis. That is, the groove 33 is provided on the outer peripheral side of the lens frame thrust receiving surface 31 so as to be adjacent to the lens frame thrust receiving surface 31. The lens frame thrust receiving surface 31 is formed longer than the groove 33 in the circumferential direction centered on the optical axis. On the other hand, the lens frame radial receiving surface 32 is provided at a position adjacent to the groove 33 in the circumferential direction centered on the optical axis with a phase change.

  The lens frame thrust receiving surface 31 is not adjacent to the lens frame radial receiving surface 32 (clockwise in the drawing) from the side adjacent to the lens frame radial receiving surface 32 (clockwise in the drawing) with respect to the circumferential center of the groove 33. Side) has a long shape in the circumferential direction. The reason and effect of this structure will be described later with reference to FIG.

  The lens 1 is provided with a gate installation portion 14. The gate installation portion 14 is a portion where a gate is provided to inject a plastic material into the mold 2 when the lens 1 is molded using the mold 2. When the lens 1 is molded by the mold 2, a gate cannot be provided in the lens portion 11 having the lens surfaces (R1 surface 111, R2 surface 112). Therefore, when a gate is provided in a necessary size with respect to the peripheral portion 12 of the lens 1, a gate installation portion 14 protruding from the outer peripheral surface of the peripheral portion 12 is formed.

  The lens frame 3 is provided with a gate relief portion 36 for accommodating the gate installation portion 14 formed on the lens 1. When the lens 1 is incorporated in the lens frame 3, in order to reduce the burden of angle alignment with the optical axis as the center, the width of the gate relief portion 36 in the circumferential direction with the optical axis as the center is better. This is because if the width of the gate relief portion 36 is narrow, the lens 1 cannot be incorporated into the lens frame 3 unless the angle around the optical axis of the lens 1 is adjusted.

  As described above, by providing the lens frame radial receiving surface 32 and the groove portion 33 at positions that are substantially adjacent to each other in the circumferential direction centered on the optical axis, the circumferential direction centering on the optical axis of the gate relief portion 36 is provided. It becomes easy to form with a large width. This is because when the lens frame radial receiving surface 32 and the groove portion 33 are provided apart from each other in the circumferential direction around the optical axis, the width of the gate relief portion 36 must be reduced by that distance. This is because it becomes impossible.

  The lens frame thrust receiving surface 31 is an upper surface of a convex portion slightly protruding from the periphery thereof, and is a flat surface orthogonal to the optical axis. The lens frame radial receiving surface 32 is an arcuate curved surface that slightly protrudes from the inner peripheral wall 35 of the lens frame 3. The protrusion height of the lens frame radial receiving surface 32 is as small as possible as long as it can be molded and can maintain the protrusion even after deformation after the lens 1 is incorporated into the lens frame 3. Is desirable.

  The lens 1 is positioned in the thrust direction (direction along the optical axis) by the lens thrust receiving surface 121 coming into contact with the three lens frame thrust receiving surfaces 31. Further, the lens 1 has a radial direction (a direction perpendicular to the optical axis) by fitting a lens radial receiving surface 122 formed on the outer peripheral side surface to a position surrounded by the three lens frame radial receiving surfaces 32. Positioned with. In a state where the lens 1 is positioned with respect to the lens frame 3 in this manner, an ultraviolet curable adhesive is poured into the groove portion 33, and the lens 1 is bonded to the lens frame 3 by irradiating ultraviolet rays.

  FIG. 3A is a front view of the lens barrel 100 as viewed from the subject side. FIG.3 (b) is sectional drawing of arrow BB shown to Fig.3 (a). FIG.3 (c) is an enlarged view of the area | region C in FIG.3 (b).

  In the lens frame 3, an outer peripheral surface (hereinafter referred to as “convex outer surface”) 311 that forms the lens frame thrust receiving surface 31 is provided on the inner peripheral side in the radial direction with respect to the burr 13. If the outer peripheral surface 311 of the convex portion is located on the outer peripheral side in the radial direction with respect to the burr 13, the lens frame thrust receiving surface 31 and the burr 13 will be in contact with each other, and the projection amount of the burr 13 will be the same. The lens 1 is fixed with an unintended inclination. Therefore, by providing the convex outer peripheral surface 311 on the inner peripheral side in the radial direction from the burr 13, the lens 1 is arranged at a predetermined position of the lens frame 3 without the burr 13 abutting against any part of the lens frame 3. It is possible to prevent the lens 1 from being inclined unintentionally.

  A standing wall portion 34 is provided on the outer peripheral side of the convex portion outer peripheral surface 311 in the radial direction, and the standing wall radial surface 341 that is the inner peripheral surface of the standing wall portion 34 faces the convex portion outer peripheral surface 311. . The convex outer peripheral surface 311 and the standing wall radial surface 341 are connected by a burr flank 37. That is, the convex outer peripheral surface 311 stands on the inner peripheral side of the burr flank 37, and the standing wall radial surface 341 stands on the outer peripheral side of the burr flank 37.

  The standing wall portion 34 has a predetermined height in the thrust direction so that the lens radial receiving surface 122 and the standing wall radial surface 341 face each other in the radial direction. The adhesive cannot enter the lens frame thrust receiving surface 31 unless it passes through the gap formed between the lens radial receiving surface 122 and the standing wall radial surface 341. In general, since the adhesive has a certain viscosity and becomes difficult to enter as the gap becomes narrower, the adhesive enters the lens frame 3 from the groove 33 toward the lens frame thrust receiving surface 31. It is a difficult structure.

  Thus, the structure in which the adhesive does not easily enter the lens frame thrust receiving surface 31 contributes to maintaining the optical performance of the lens barrel 100. That is, in the structure in which the adhesive easily enters the lens frame thrust receiving surface 31, the adhesive enters between the lens thrust receiving surface 121 and the lens frame thrust receiving surface 31, and the lens 1 has an unintended inclination. The possibility that it will end up increases. However, such a problem can be avoided by using a structure in which the adhesive does not easily enter the lens frame thrust receiving surface 31.

  On the other hand, if the height in the thrust direction of the standing wall 34 is too high, the amount of adhesive that can reliably adhere to the lens radial receiving surface 122 is reduced. Therefore, it is preferable that the height of the standing wall 34 in the thrust direction is up to half of the height in the thrust direction of the lens radial receiving surface 122 (that is, lower than the center position of the lens radial receiving surface 122). In the present embodiment, in order to increase as much as possible the amount of adhesive that can reliably adhere to the lens radial receiving surface 122, the height of the standing wall 34 in the thrust direction is set slightly higher than the lens radial receiving surface 122. Is set.

  The inner diameter of the standing wall radial surface 341 of the standing wall portion 34 facing the lens radial receiving surface 122 is set to be the same as the inner diameter of the inner peripheral wall 35. The inner diameter of the standing wall radial surface 341 refers to the radius (or diameter) of a circle centered on the optical axis, and the inner diameter of the inner peripheral wall 35 is also the radius (or diameter) of the circle centered on the optical axis. May be). Therefore, the width of the gap between the lens radial receiving surface 122 and the standing wall radial surface 341 is equal to the protruding height of the lens frame radial receiving surface 32 with respect to the inner peripheral wall 35, and is as small as described above.

  The advantage of setting the inner diameter of the standing wall radial surface 341 to be the same as the inner diameter of the inner peripheral wall 35 will be described below. If the inner diameter of the standing wall radial surface 341 is set to be the same as the inner diameter of the lens frame radial receiving surface 32, the standing wall radial surface 341 also contributes to the positioning of the lens 1 in the radial direction. It corresponds to a part of 32. In this case, the area of the lens frame radial receiving surface 32 is substantially increased, and it is difficult to ensure dimensional accuracy. On the other hand, in order to prevent the area contributing to the positioning of the lens 1 in the radial direction from increasing, the lens 1 is positioned in the radial direction by the standing wall radial surface 341 without providing the lens frame radial receiving surface 32. Think about the structure. In this case, however, the height of the standing wall 34 in the thrust direction is limited as described above, and the fitting length with the lens 1 is shortened, making it difficult to ensure positioning accuracy. Therefore, it is not desirable to set the inner diameter of the standing wall radial surface 341 to be the same as the inner diameter of the lens frame radial receiving surface 32.

  On the other hand, if the inner diameter of the standing wall radial surface 341 is set to be longer than the inner diameter of the inner peripheral wall 35, a gap formed between the lens radial receiving surface 122 and the standing wall radial surface 341 becomes wide. . Then, the adhesive easily enters between the lens thrust receiving surface 121 and the lens barrel thrust receiving surface 31 from this gap, and the possibility that the lens 1 is bonded with an unintended inclination increases. Therefore, it is not desirable to increase the inner diameter of the standing wall radial surface 341 more than necessary. Therefore, it is preferable that the inner diameter of the standing wall radial surface 341 is the same as the inner diameter of the inner peripheral wall 35 which is longer than the inner diameter of the lens frame radial receiving surface 32 and is the smallest settable inner diameter.

  Next, with reference to FIG.2 and FIG.3, the flow method of an adhesive agent is demonstrated. Most of the adhesive poured into the groove 33 remains inside the groove 33 and adheres to the lens radial receiving surface 122 to bond the lens 1 and the lens frame 3 together. A part of the adhesive enters the burr flank 37 through a gap formed between the lens radial receiving surface 122 and the standing wall radial surface 341. However, since the standing wall portion 34 is provided, the adhesive does not enter the gap between the lens radial receiving surface 122 and the standing wall radial surface 341 and enters the burr flank 37. I can't. In this way, entry of the adhesive toward the burr flank 37 is suppressed.

  The adhesive that has entered the burr escaping surface 37 from the gap formed between the lens radial receiving surface 122 and the standing wall radial surface 341 becomes the lens 1, the convex outer peripheral surface 311, the burr escaping surface 37, and the standing wall radial. The adhesive reservoir which is a space formed by the surface 341 is filled. If the convex outer peripheral surface 311 is provided on the outer peripheral side in the radial direction with respect to the burr 13, the volume of the adhesive reservoir becomes small, and the adhesive is immediately filled. In that case, the adhesive filled in the adhesive reservoir may enter between the lens thrust receiving surface 121 and the lens barrel thrust receiving surface 31 to cause a problem such as unintentional tilting of the lens 1. . On the other hand, in this embodiment, the convex outer peripheral surface 311 is provided on the inner peripheral side in the radial direction from the burr 13. Therefore, it is possible to increase the volume of the adhesive reservoir, and thereby it is possible to suppress the adhesive from entering between the lens thrust receiving surface 121 and the lens frame thrust receiving surface 31. That is, by providing the convex outer peripheral surface 311 on the inner peripheral side in the radial direction with respect to the burr 13, the lens 1 is inclined and fixed by the adhesive and the problem that the lens 1 is inclined by the burr 13. Can be solved at the same time.

  The adhesive filled in the adhesive reservoir spreads in the circumferential direction around the optical axis. At this time, in the phase (region) where the lens frame thrust receiving surface 31 is formed, the adhesive reaches the phase where the lens frame thrust receiving surface 31 is not formed. Then, it further flows toward the lens portion 11 of the lens 1. If the adhesive reaches the lens unit 11, the optical performance of the lens unit 11 is deteriorated.

  In order to avoid this problem, the lens frame thrust receiving surface 31 is formed larger than the groove 33 in the circumferential direction centered on the optical axis. That is, if the lens frame thrust receiving surface 31 is not formed larger in the circumferential direction centered on the optical axis than the groove 33, the adhesive injected into the groove 33 is blocked by the convex outer peripheral surface 311. Therefore, the possibility of reaching the lens unit 11 directly increases. On the other hand, in the present embodiment, the lens frame thrust receiving surface 31 is formed larger in the circumferential direction around the optical axis than the groove portion 33, thereby suppressing the flow of the adhesive into the lens portion 11, The optical performance of the lens barrel 100 is maintained. If the lens frame thrust receiving surface 31 is too large, it is difficult to ensure dimensional accuracy. Therefore, it is preferable to make the lens frame thrust receiving surface 31 as small as possible.

  The ease of spreading of the adhesive in the circumferential direction around the optical axis from the groove 33 is greater in the direction not adjacent to the lens frame radial receiving surface 32 than in the direction adjacent to the lens frame radial receiving surface 32. The direction adjacent to the lens frame radial receiving surface 32 is a counterclockwise direction from the groove 33 toward the lens frame radial receiving surface 32 with reference to the groove 33 in FIG. The direction not adjacent to the lens frame radial receiving surface 32 is a clockwise direction from the groove 33 toward the opposite side of the lens frame radial receiving surface 32 with reference to the groove 33 in FIG.

  In the direction from the groove portion 33 toward the lens frame radial receiving surface 32, the gap between the lens frame radial receiving surface 32 and the lens radial receiving surface 122 is small, so that the adhesive hardly enters due to viscosity. Thus, in the direction in which the adhesive does not easily enter, a region where the lens frame thrust receiving surface 31 needs to be provided in order to dam the adhesive is narrowed. On the contrary, in the direction in which the adhesive easily enters, a region where it is necessary to provide the lens frame thrust receiving surface 31 in order to dam the adhesive becomes wide. Therefore, in the present embodiment, the lens frame thrust receiving surface 31 is formed to be large in the circumferential direction not adjacent to the lens frame radial receiving surface 32 from the groove 33 with the optical axis as the center.

  As described above, according to the present invention, the convex outer peripheral surface 311 of the convex portion that forms the lens barrel thrust receiving surface 31 that comes into contact with the lens thrust receiving surface 121 of the lens 1 is more than the burr 13 that the lens 1 has. It is provided on the inner peripheral side in the radial direction. Accordingly, since the burr 13 does not contact any part of the lens frame 3, the lens 1 can be disposed at a predetermined position of the lens frame 3, and an unintended inclination with respect to the lens frame 3 occurs. This can be prevented. Further, when the lens 1 is bonded and fixed to the lens frame 3 with an adhesive, entry of the adhesive between the lens thrust receiving surface 121 and the lens frame thrust receiving surface 31 is prevented. It is possible to prevent the lens 1 from being tilted.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. The lens frame thrust receiving surface 31, the lens frame radial receiving surface 32, and the groove portion 33 are provided at three locations, respectively, but the present invention is not limited to this and may be provided at four or more locations.

DESCRIPTION OF SYMBOLS 1 Plastic lens 3 Mirror frame 11 Lens part 12 Peripheral part 31 Mirror frame thrust receiving surface 32 Mirror frame radial receiving surface 33 Groove part 34 Standing wall part 100 Lens barrel 121 Lens thrust receiving surface 122 Lens radial receiving surface 311 Outer peripheral surface 341 Standing wall Radial surface

Claims (7)

A lens barrel comprising a plastic lens and a lens frame holding the plastic lens,
The plastic lens is
A lens thrust receiving surface provided at the peripheral edge of the plastic lens so as to be orthogonal to the optical axis;
A lens radial receiving surface provided on the outer peripheral surface of the plastic lens,
The lens frame is
A groove portion provided at at least three locations at equal intervals in the circumferential direction around the optical axis of the plastic lens, and located on the outer periphery of the peripheral edge portion of the plastic lens;
A convex portion that is provided in the circumferential direction in phase with the groove portion, is longer than the groove portion in the circumferential direction, and protrudes in the direction of the optical axis;
A lens frame radial receiving surface that fits with the lens radial receiving surface and positions the plastic lens in a direction orthogonal to the optical axis;
A standing wall portion provided in the groove portion so as to face the outer peripheral surface of the convex portion and the lens radial receiving surface;
The upper surface of the convex portion is in contact with the lens thrust receiving surface to position the plastic lens in the direction of the optical axis,
The outer peripheral surface of the convex portion is located on the inner peripheral side with respect to the outer peripheral surface of the lens thrust receiving surface,
The lens barrel, wherein the plastic lens is bonded to the lens frame with an adhesive in the groove.   The lens barrel according to claim 1, wherein a height of the standing wall portion in the direction of the optical axis is lower than a center position of the lens radial receiving surface in the direction of the optical axis.   The radius of the surface facing the outer peripheral surface of the convex portion in the standing wall portion around the optical axis is the same as the inner peripheral wall provided to surround the outer peripheral surface of the plastic lens in the lens frame. The lens barrel according to claim 1 or 2, wherein The groove portion is adjacent to the lens frame radial receiving surface in a circumferential direction around the optical axis,
The convex portion has a shape that is longer in a side not adjacent to the lens frame radial receiving surface than in a side where the groove portion is adjacent to the lens frame radial receiving surface in the circumferential direction. The lens barrel according to any one of 1 to 3.   The lens barrel according to any one of claims 1 to 4, wherein the plastic lens has a burr at a boundary between the lens thrust receiving surface and the lens radial receiving surface. The lens barrel according to any one of claims 1 to 5,
An electronic device comprising: an imaging device that photoelectrically converts an optical image of light that has passed through the lens barrel. A lens holding member for holding a lens,
A receiving surface that fits with the outer peripheral surface of the lens;
Groove portions provided at at least three locations at equal intervals in the circumferential direction around the optical axis of the lens so as to be positioned on the outer periphery of the lens in a state where the lens is fitted to the receiving surface;
A convex portion provided in the circumferential direction around the optical axis in the same phase as the groove, longer in the circumferential direction than the groove, and protruding in the direction of the optical axis;
A standing wall portion provided in the groove portion so as to face the outer peripheral surface of the convex portion and the outer peripheral surface of the convex portion in a state where the lens is fitted to the receiving surface,
In a state where the lens is fitted to the receiving surface, the upper surface of the convex portion is in contact with the peripheral portion of the lens, and the outer peripheral surface of the convex portion is located on the inner peripheral side of the outer peripheral surface of the lens. A lens holding member.

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