JP2007101878A - Lens structure body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens structure body for sure holding of lenses. <P>SOLUTION: In the lens structure body 10 in which the lenses 20 are held on the internal wall 31 of a lens barrel 30 made of a resin, a plurality of elastic projections 40 extending in the axial direction are formed along the circumference of the internal wall 31, and the lenses 20 are held by the projections 40. Since the lenses are elastically pressed by the projections, the lenses are held surely. In addition, since the projections will not be crushed by press-fitting of the plurality of lenses into the lens barrel 30, the lenses can be held surely. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lens structure having a structure for securely holding a lens.

  A lens system such as a camera or a video camera includes a plurality of lens units in order to exhibit a focus adjustment function and a zoom function. The lens portion (lens structure) is configured by holding the lens inside the lens barrel.

  The lens includes the optical axis and the central axis of the lens barrel (hereinafter, the central axis of the lens barrel refers to the center of the inner diameter of the lens barrel or, if there is a convex part, the center of a circle connecting the tops of the convex parts) Since it is necessary to match and hold accurately, the lens barrel is constituted by a metal frame that can be processed with high accuracy. However, in recent years, the use of a lens barrel as a resin has been proposed due to demands for improvement in productivity and weight reduction (refer to Patent Document 1; hereinafter, Conventional Example 1).

FIG. 10 is an explanatory view showing a method of holding the lens shown in the first conventional example. In Conventional Example 1, the lens barrel 130 is formed of resin, and the protruding streaks 140 are formed of resin on the inner wall 131. The protruding streaks 140 are formed substantially parallel to the central axis of the lens barrel 130, and a plurality of protrusions 140 are formed in the circumferential direction. Further, the distance between the top of the protruding stripe 140 and the central axis is smaller than the radius of the lens 120. The lens 120 is held in the lens barrel 130 by press-fitting while crushing the top of the protruding streaks 140. Since the lens 120 is pressed by a plurality of protruding streaks 140, the optical axis of the lens 120 coincides with the central axis of the lens barrel 130.
JP-A-61-84615

  However, the conventional example 1 has a configuration in which the lens is held by collapsing the protruding streaks. Therefore, there is a problem that when the position is adjusted after the lens is press-fitted, the pressing force is weakened and the lens is easily detached.

  There is also a problem that another lens cannot be press-fitted. Therefore, it is difficult to hold a plurality of lenses. In particular, when a lens having a small outer shape needs to be combined later, there is a problem that a lens to be press-fitted later is not held. For example, an aspherical lens manufactured by glass molding and a spherical lens manufactured by polishing are likely to have a difference in lens outer shape. Therefore, a problem particularly occurs when a lens structure is configured by combining these lenses. It was.

  In addition, there is a problem that the lens is loosely held when there is a temperature change in the surrounding environment. This is because the lens barrel made of resin has a larger expansion coefficient than the lens, so that the contact between the lens and the protruding streaks is separated when the periphery becomes high temperature.

  In addition, there is a problem that the lens barrel itself is deformed by the press-fitting of the lens. This is because the force concentrates on the protruding streaks when the lens is press-fitted, and distortion is likely to occur in the portions where the protruding streaks are formed.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a lens structure that can adjust the position of a lens and can reliably hold a plurality of lenses.

  The lens structure according to the present invention is a lens structure in which a lens is held on the inner wall of a lens barrel made of resin, and the inner wall has an elastic convex portion extending in the axial direction on the circumference of the inner wall. A plurality of the lenses are formed along the convex portions.

  With this configuration, since the lens is elastically pressed and held by the convex portion, the lens is securely held. Further, since the convex portion extends in the axial direction, it can be held at an arbitrary location inside the lens barrel. In addition, the lens is press-fitted while being in contact with the convex part, but even in that case, the convex part is returned to the original without being crushed. The lens can be securely held.

  In the lens structure according to the present invention, a plurality of the lenses are provided. With this configuration, a lens structure having optical characteristics as a combination lens can be obtained.

  In the lens structure according to the present invention, the lenses have different peripheral sizes. With this configuration, it is not necessary to make the peripheral size of each lens the same, so that the cost of processing the lens can be reduced. In addition, since lenses having different finished dimensions can be combined, the range of lens combinations is widened. For example, glass mold lenses and glass polished lenses have the same dimensions in design, but the manufacturing method is different, so the average value of the finished dimensions will be different. Even in such a case, these lens groups must be combined. Can do.

  In the lens structure according to the present invention, the lens has a circular outer periphery. With this configuration, the pressing force by each convex portion is directed toward the center of the lens, so that the optical axis of the lens and the central axis of the lens barrel can be matched more completely.

  In the lens structure according to the present invention, the convex portions are formed at equal intervals. With this configuration, each convex portion abuts uniformly on the periphery of the lens and the same degree of deformation occurs, so that the periphery of the lens is pressed into contact at equal intervals by an equal force. As a result, the optical axis of the lens and the central axis of the lens barrel substantially coincide. In addition, since both sides of the convex part are valleys, the convex part is deformed so as to expand to the valley side, and stress is not transmitted to the periphery, so the outer shape of the lens barrel can be deformed even if a lens is pressed in. There is no.

  In the lens structure according to the present invention, the convex portion is formed of a wide curved surface. With this configuration, since the convex portion is wide, the convex portion is deformed approximately symmetrically by the press-fitting of the lens, and the pressing force is directed toward the center of the lens. In addition, the pressing force for holding the lens does not cause an imbalance, and the periphery of the lens is pressed evenly with force. Therefore, the optical axis of the lens coincides with the central axis of the lens barrel, and the deviation of the optical axis is suppressed.

  Further, since the portion that comes into contact with the lens when it is press-fitted becomes a surface, the pressure does not concentrate on the top, and the top does not plastically deform and become crushed. That is, when the top has a sharp shape, the pressure may be concentrated and it may be crushed, but such a situation does not occur by making the top a curved surface.

  Further, in the lens structure according to the present invention, when the convex portion has a radius of the lens as R, a height of the convex portion as h, and a radius of a circle formed by the tops of the convex portions as r. , R−r <0.1h. With this configuration, it is possible to moderately suppress the deformation of the convex portion due to the press-fitting of the lens and to elastically hold the lens within a range in which the elasticity of the convex portion is moderately generated without plastic deformation of the convex portion. In addition, since the plurality of lenses are held under the same conditions, the optical axis of each lens and the central axis of the barrel are more completely matched.

  In the lens structure according to the present invention, the lens is formed of a glass mold lens or a glass polishing lens. With this configuration, since either a glass mold lens or a glass polished lens may be used, the combination width of the lenses is expanded, and the production efficiency is improved.

  In the lens structure according to the present invention, the lens barrel is formed of a reinforced resin containing a filler. With this configuration, the rigidity of the lens barrel is enhanced and the lens barrel is difficult to be deformed, so that the optical axis of each lens and the central axis of the lens barrel are less likely to be shifted. In addition, the dimensional accuracy of the lens barrel is improved.

  In the lens structure according to the present invention, the convex portion has a lower filler content than the outer edge portion of the lens barrel. This configuration increases the rigidity of the outer edge portion of the lens barrel while maintaining the elasticity of the convex portion. Therefore, it is effective that the deformation generated in the convex portion reaches the outer edge portion of the lens barrel while elastically holding the lens. Therefore, the deformation of the lens barrel itself can be eliminated. Therefore, the optical axis of each lens and the central axis of the lens barrel do not shift.

  In the lens structure according to the present invention, the lens barrel has a smaller linear expansion coefficient in the circumferential direction than in the radial direction. With this configuration, when the ambient temperature changes, the lens barrel thermally expands in the thickness direction with little change in the circumferential direction, so that the difference between the lens barrel diameter and the lens diameter hardly changes. The amount of deformation of the convex portion that comes into contact with the lens changes, so that the lens does not come off.

  According to the lens structure according to the present invention, since the lens is held by elastic deformation of the convex portion, the lens can be reliably held.

  Moreover, according to the lens structure according to the present invention, a lens structure having optical characteristics as a combined lens can be obtained by combining lenses.

  In addition, according to the lens structure according to the present invention, it is possible to combine lenses having different peripheral sizes, so that the manufacturing cost can be reduced.

  Further, according to the lens structure according to the present invention, since the outer shape of the lens is circular, the optical axis of the lens and the central axis of the lens barrel can be matched more.

  Further, according to the lens structure according to the present invention, since the convex portions are formed at equal intervals, the peripheral edge of the lens is pressed evenly, so that the optical axis of the lens and the central axis of the lens barrel are more coincident with each other. Can be made.

  In addition, according to the lens structure according to the present invention, since the convex portion is formed as a wide curved surface, the convex portion is deformed symmetrically and does not cause an imbalance in the pressing force for holding the lens. It is possible to make the optical axis and the central axis of the lens barrel more coincident with each other. In addition, the lens can be easily press-fitted.

  In addition, according to the lens structure according to the present invention, the degree of deformation of the convex portion can be suppressed by keeping the relationship between the lens diameter and the height of the convex portion under a certain condition, so that the lens is securely held elastically. Can be made.

  Further, according to the lens structure according to the present invention, since the lens can be either a glass mold lens or a glass polished lens, the combination width is widened and the production efficiency is improved.

  Moreover, according to the lens structure according to the present invention, the lens barrel is formed of a reinforced resin containing a filler, so that there is almost no deformation of the outer shape.

  Further, according to the lens structure according to the present invention, the filler content is high at the outer edge of the lens barrel, and the filler content is low at the convex portion, so that the lens is held elastically, There is almost no deformation of the lens barrel itself.

  Further, according to the lens structure according to the present invention, since the expansion coefficient in the circumferential direction is small, the outer diameter of the lens barrel hardly deforms even when the ambient temperature changes, and the lens does not come off.

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

<Embodiment 1>
FIG. 1 is a perspective view of a lens structure according to Embodiment 1 of the present invention. FIG. 2 is a schematic cross-sectional view seen from the direction of arrows AA in FIG. FIG. 3 is a schematic cross-sectional view as seen from the direction of arrows BB in FIG.

  The lens structure 10 according to the present embodiment is composed mainly of lenses 20a and 20b and a lens barrel 30 that holds the lenses 20a and 20b inside. The lens structure 10 may be composed of two or more lenses 20a, 20b,. Moreover, you may comprise by the single lens 20a.

  The lenses 20a and 20b have a substantially circular outer shape and are manufactured by glass polishing. Or it produces by the glass mold method. The lenses 20a and 20b do not need to be manufactured by the same manufacturing method. Further, the optical axes JR of the lenses 20 a and 20 b are arranged so as to coincide with the central axis JK of the lens barrel 30.

  The lens barrel 30 has a substantially cylindrical shape, is formed of resin, and a convex portion 40 is formed on the inner wall 31. The convex portions 40 are formed in parallel to the central axis (hereinafter referred to as Z direction) JK of the lens barrel, and a plurality of the convex portions 40 are provided at equal intervals in the circumferential direction. At least three convex portions 40 are formed. Since it is preferable to press and hold the peripheral edges of the lenses 20a and 20b from all directions by the convex portion 40, it is preferable that a large number of convex portions are formed. In the present embodiment, 16 convex portions 40 are formed.

  The convex portion 40 is configured by a symmetrical curved surface (wide curved surface) that bulges from the top portion 41 to the bottom portion 43, and comes into contact with the peripheral edges and surfaces of the lenses 20a and 20b. In addition, the symmetrical curved surface has shown that the cross-sectional shape of the convex part 40 is symmetrical with respect to the radial direction.

  A circle C1 constituted by the top portions 41 of the respective convex portions 40 is smaller than the outer peripheral circle of any of the lenses 20a and 20b. That is, the radius r of the circle C1 constituted by the top portions 41 of the respective convex portions 40 is smaller than the radius R (Ra, Rb) of the outer circumference circle of the lenses 20a, 20b. Further, a circle C2 formed by the bottom 43 of each convex portion 40 is larger than the outer peripheral circle of the lenses 20a and 20b.

  The resin forming the lens barrel 30 is selected in consideration of rigidity or toughness and elasticity. That is, the resin is required to have rigidity in order not to impair the function of holding the lenses 20a and 20b, and to be elastic in order to have a function of holding the lenses 20a and 20b elastically. For example, PC (polycarbonate) resin, ABS resin, PBT (polybutyl terephthalate) resin, PPS (polyphenylene sulfide) resin, or the like is used. In selecting the resin, the moldability of the lens barrel 30 and the convex portion 40 is also taken into consideration.

  Next, the holding of the lenses 20a and 20b will be described in detail with reference to FIGS. 4 is a partially enlarged view of a cross section viewed from the direction of arrows CC in FIG.

  The lens structure 10 is assembled by press-fitting the lenses 20 a and 20 b into the lens barrel 30. Further, after applying heat to the lens barrel 30 to inflate the lens barrel 30, the lenses 20a and 20b are press-fitted. Since the convex portion 40 is a curved surface, the lenses 20a and 20b are smoothly press-fitted.

  A convex portion 40 is formed on the inner wall 31 of the lens barrel 30 along the central axis JK. Since the circle C1 formed by the top 41 of the convex portion 40 is slightly smaller than the lenses 20a and 20b, the convex portion 40 is elastic. The lenses 20a and 20b are press-fitted while being deformed. The peripheral edges of the lenses 20 a and 20 b are held by a pressing force generated by elastic deformation of the convex portion 40. That is, since the lenses 20a and 20b are pressed and held as a whole by the dents of the convex portions 40 generated at the contact portions, the lenses 20a and 20b do not move with a little force. Accordingly, the lenses 20a and 20b are held without applying an adhesive at the contact portion with the convex portion 40.

  Since the convex part 40 has elasticity, parts other than the contact point of the lenses 20a and 20b return to the original shape. Therefore, after one lens 20a (or 20b) is press-fitted, another lens 20b (or 20a) can be press-fitted.

  Further, the convex portions 40 are formed at equal intervals on the inner wall 31 of the lens barrel 30, and the cross-sectional shapes thereof are the same, so that the lenses 20a and 20b are press-fitted into a substantially identical state. Will be transformed. Further, since the cross section of the convex portion 40 is symmetrical with respect to the radial direction, the convex portion 40 is deformed into a substantially symmetrical trapezoidal shape, and the pressing force generated by the deformation is directed toward the centers of the lenses 20a and 20b. .

  Accordingly, the pressing force generated in each convex portion 40 is substantially equal toward the center of each of the lenses 20a and 20b. As a result, the peripheral edges of the lenses 20a and 20b are pressed toward the center by a substantially uniform pressing force by the convex portion 40, so that the optical axis JR of the lenses 20a and 20b is aligned with the central axis JK of the lens barrel 30. To match.

  On the contrary, since the stress generated by the deformation of each convex portion 40 is equal, the stress generated in the lens barrel 30 is balanced, and the lens barrel 30 is not deformed. Further, both sides of the convex portion 40 are valleys, and the convex portion 40 is deformed so as to expand toward the valley side, so that it is difficult to transmit stress to the outer edge of the lens barrel 30. Therefore, the outer shape of the lens barrel 30 is not deformed or enlarged by press-fitting the lenses 20a and 20b. Thereby, even if one lens 20a (or 20b) is press-fitted, since the outer shape of the lens barrel 30 is not deformed, the other lens 20b (or 20a) can be press-fitted. In addition, since the outer shape of the lens barrel 30 is not enlarged regardless of the press-fitting of the lenses 20a and 20b, the plurality of lenses 20a and 20b can be reliably held.

  In addition, since the convex portion 40 is a wide curved surface, the first contact portion when the lenses 20a and 20b are press-fitted becomes a surface, so that the pressure does not concentrate on the top portion 41, and the top portion 41 is plastically deformed. It won't be crushed. That is, when the top portion 41 has a sharp shape, the pressure may be crushed due to concentration, but this is not caused by making the top portion 41 a curved surface.

  Next, the dimension of the convex part 40 is demonstrated in detail.

  5 is a partially enlarged view of a cross section viewed from the direction of arrows CC in FIG. 3 in a state where there is no lens in the lens structure according to Embodiment 1 of the present invention. In the figure, approximately one quarter of the cross section is shown.

  In the state without the lenses 20a and 20b, the convex portion 40 is not deformed and has a height h. Further, the radius r of the circle C1 constituted by the top portions 41 of the respective convex portions 40 is smaller than the radius R (Ra, Rb) of the lenses 20a, 20b, and has a relationship of R> r. The height h of the convex portion 40 is the distance from the bottom portion 43 to the top portion 41 of the convex portion 40.

  6 is a partially enlarged view of a cross section viewed from the direction of arrows CC in FIG. 3 in a state where the lens is held in the lens structure according to Embodiment 1 of the present invention. In the figure, approximately one quarter of the cross section is shown.

  In a state where the lenses 20a and 20b are present, the convex portion 40 expands and deforms on both sides, and the height h is lowered by R−r. Here, the convex part 40 does not need to be plastically deformed, but needs to absorb Rr by elastic deformation.

  The dimension (Rr) to be absorbed by the convex portion 40 is required to be approximately 10 μm. Specifically, since the diameter accuracy of the lenses 20a and 20b is about ± 10 μm and the processing accuracy of the lens barrel 30 by resin molding is ± 10 μm, the dimension (R−r) that the convex portion 40 should absorb. ) Is required to be approximately 10 μm.

  Here, if the convex portion 40 is large, the proportion of deformation with respect to the entire convex portion 40 is reduced, and the dimension (R−r) can be reliably absorbed. However, if the convex portion 40 is excessively large, This is not preferable because the outer shape of the lens barrel 30 becomes large. Moreover, when the convex part 40 is enlarged, the dimension of the convex part 40 will vary, and the shape of the circle C1 constituted by the top part 41 of the convex part 40 will be distorted. Furthermore, if the convex portion 40 is enlarged, the number of convex portions 40 that can be formed on the inner wall 31 of the lens barrel 30 is limited, and the direction in which the lenses 20a and 20b are pressed is limited. Therefore, the convex part 40 cannot be enlarged too much.

  Therefore, the size of the convex portion 40 is a size that can elastically absorb the dimension of ± 10 μm, and since it is necessary to make it easy to form the convex portion 40, the height h of the convex portion 40 is 100 μm is reasonable.

Thereby, it is preferable that the dimension (R−r) to be absorbed by the convex portion 40 is smaller than one tenth of the height h of the convex portion 40. That is,
R−r <0.1h (1)
It is preferable to satisfy the relationship.

<Embodiment 2>
FIG. 7 is a front view of a lens structure according to Embodiment 2 of the present invention. In the present embodiment, a lens structure 10 in which the periphery of lenses 20c and 20d (not shown) is an octagon will be described. Since the structure of the lens structure 10 is the same as that of the first embodiment, the description thereof is omitted. Here, holding of the octagonal lenses 20c and 20d will be described.

  In the present embodiment, the lenses 20c and 20d whose peripheral edges are octagonal are pressed and held by the plurality of convex portions 40. Each convex portion 40 asymmetrically deforms because it abuts on the side surface of the peripheral edge which is an octagon, and is pressed in a direction slightly deviated from the centers of the lenses 20c and 20d. However, since the peripheral edges of the lenses 20c and 20d are pressed by a large number of convex portions 40, each pressing force is equalized in the pressing direction and the amount of pressing force, and moves toward the center of the lenses 20c and 20d. Therefore, even if the peripheral edges are the octagonal lenses 20c and 20d, the optical axis JR of the lenses 20c and 20d and the central axis JK of the lens barrel 30 are held in alignment.

  Further, since the convex portion 40 is elastically deformed, the other lens 20d (or 20c) can be held while holding the octagonal lens 20c (or 20d).

  In the present embodiment, the lens structure 10 of the octagonal lenses 20c and 20d has been described. However, the same effect can be obtained for other polygonal lenses.

<Embodiment 3>
FIG. 8 is a cross-sectional view of the lens structure according to Embodiment 3 of the present invention. The lens structure 10 according to the present embodiment includes a plurality of lenses 20e and 20f and a lens barrel 30 that holds the lenses 20e and 20f inside. Since the main configuration is the same as that of the first embodiment, description thereof is omitted. In the present embodiment, lenses 20e and 20f having different diameters are held by the lens barrel 30, and this will be described.

  The one lens 20e is an aspheric lens and is formed of a glass mold. The other lens 20f is a spherical lens and is formed by glass polishing. Each lens 20e, 20f has a different diameter. This dimensional difference arises from the difference in the manufacturing method of both lenses. That is, even if the glass mold lens and the glass polished lens have the same dimensions in design, the manufacturing method is different, so that a dimensional difference occurs in the average value of the finished dimensions.

  The lens structure 10 is assembled by press-fitting the lenses 20e and 20f. Either the lens 20e or the lens 20f may be press-fitted into the lens barrel 30 first. That is, even if any lens 20e (or 20f) is press-fitted first, the convex portion 40 returns to its original shape without being plastically deformed, so that the other lens 20f (or 20e) can be held. . Each lens 20e, 20f is held by the lens barrel 30 by the deformation of the convex portion 40 as in the first embodiment, and the outer periphery is pressed almost uniformly toward the center by the convex portion 40, so each lens 20e. , 20f becomes coincident with the central axis JK of the lens barrel 30.

  In addition, it is preferable that the radius Re of the lens 20e and the radius Rf of the lens 20f satisfy the relationship described in Embodiment 1, Expression (1). By satisfying this relationship, the plurality of lenses 20e and 20f are more reliably held.

<Embodiment 4>
FIG. 9 is an enlarged cross-sectional view of the lens structure according to Embodiment 4 of the present invention. The lens structure 10 according to the present embodiment includes a plurality of lenses 20 (20g, 20h,...) And a lens barrel 30 that holds the lenses 20 (20g, 20h,...) Inside. Has been. Since the structure of the lens structure 10 is the same as that of the first embodiment, the description thereof is omitted. In the present embodiment, since the materials constituting the lens barrel 30 are different, this point will be described.

  In the lens structure 10 according to the present embodiment, the lens barrel 30 is formed of a resin containing a fiber filler. For example, a PC resin reinforced with glass fiber or carbon fiber is used. When the lens barrel 30 is molded, the resin flows along the circumference of the lens barrel 30. Since the convex portion 40 is provided so as to extend in a direction substantially perpendicular to the resin flow direction, the filler hardly enters the convex portion 40. Further, filler fibers (fibers) are aligned in the circumferential direction (flow direction) Dc.

  Thereby, the convex part 40 becomes low in the filler content, and retains the elastic characteristics of the resin-based material. Specifically, the convex part 40 will have elastic characteristics, such as PC resin which is not strengthened with the filler. Therefore, the lens 20 to be held is elastically held by the convex portion 40.

  Since the outer edge portion 32 of the lens barrel 30 is reinforced by the filler and the rigidity of the outer edge portion 32 is increased, the lens barrel 30 is hardly deformed even when the lens 20 is press-fitted. Therefore, the optical axis JR of the lens 20 is not shifted.

  Further, since the lens barrel 30 has the filler fibers aligned in the circumferential direction (flow direction) Dc, the linear expansion coefficient in the circumferential direction Dc is smaller than that in the radial direction Dr. Therefore, the outer diameter of the lens barrel 30 hardly changes with little change in the circumferential direction Dc with respect to the surrounding temperature change.

  On the other hand, the linear expansion coefficient in the radial direction Dr is larger than that in the circumferential direction Dc. However, since the resin thickness in this direction is small and the amount of change is small, it is absorbed as a change in the convex portion 40. That is, even if the thickness of the lens barrel 30 expands and contracts due to the ambient temperature, only the degree of deformation of the convex portion 40 changes.

  Therefore, when the ambient temperature change occurs, the lens barrel 30 hardly expands in the circumferential direction and thermally expands in the thickness direction, so that the difference between the diameter of the lens barrel 30 and the diameter of the lens 20 hardly changes. Thus, the deformation amount of the convex portion 40 that mainly contacts the lens 20 changes. That is, the lens 20 does not come off due to a change in ambient temperature.

  The configuration according to the fourth embodiment can also be applied to the lens structure 10 according to the first to third embodiments. As a result, the lenses 20a, 20b, 20c, 20d, 20e, and 20f of the lens structure 10 according to each embodiment are not detached due to a change in ambient temperature.

1 is a perspective view of a lens structure according to Embodiment 1 of the present invention. It is a schematic sectional drawing seen from the arrow AA direction in FIG. It is sectional drawing seen from the arrow BB direction in FIG. It is the elements on larger scale of the cross section seen from the arrow CC direction in FIG. It is the elements on larger scale of the cross section seen from the arrow CC direction of FIG. 3 in the state without a lens in the lens structure which concerns on Embodiment 1 of this invention. It is the elements on larger scale of the cross section seen from the arrow CC direction of FIG. 3 in the state with which the lens was hold | maintained in the lens structure which concerns on Embodiment 1 of this invention. It is a front view of the lens structure which concerns on Embodiment 2 of this invention. It is sectional drawing of the lens structure which concerns on Embodiment 3 of this invention. It is an expanded sectional view in the lens structure concerning Embodiment 4 of the present invention. It is explanatory drawing which showed the method to hold | maintain the lens shown by the prior art example 1. FIG.

Explanation of symbols

10 Lens structure 20, 20a, 20b, 20c, 20d,
20e, 20f, 20g, 20h Lens 30 Lens barrel 31 Inner wall 32 Outer edge portion 40 Convex portion 41 Top portion 42 Bottom portion 43 Bottom portion C1 Circle constituted by the top portions of the respective convex portions C2 Circle constituted by the bottom portions of the respective convex portions h Convex shape Height of the part r Radius of the circle formed by the top of each convex part R, Ra, Rb, Re, Rf Radius of the lens JR Optical axis of the lens JK Center axis of the lens barrel Dc Circumferential direction Dr Radial direction

Claims (11)

In a lens structure in which a lens is held on the inner wall of a lens barrel formed of resin,
A plurality of convex portions extending in the axial direction and having elasticity in the inner wall are formed along a circumference of the inner wall, and the lens is held by the convex portion.   The lens structure according to claim 1, wherein a plurality of the lenses are provided.   The lens structure according to claim 2, wherein the lenses have different peripheral sizes.   The lens structure according to claim 1, wherein the lens has a circular outer periphery.   The lens structure according to claim 1, wherein the convex portions are formed at equal intervals.   The lens structure according to claim 1, wherein the convex portion is formed of a wide curved surface.   The convex portion has a relationship of R−r <0.1h, where R is a radius of the lens, h is a height of the convex portion, and r is a radius of a circle formed by the tops of the convex portions. The lens structure according to claim 1, wherein the lens structure is formed so as to satisfy.   The lens structure according to claim 1, wherein the lens is configured by a glass mold lens or a glass polishing lens.   The lens structure according to claim 1, wherein the lens barrel is formed of a reinforced resin containing a filler.   The lens structure according to claim 9, wherein the convex portion has a filler content lower than that of an outer edge portion of the lens barrel.   The lens structure according to claim 1, wherein the lens barrel has a smaller linear expansion coefficient in the circumferential direction than in the radial direction.

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