JPH08201672A - Fixing structure of optical member - Google Patents

Abstract

PURPOSE: To actualize the fixing structure of an optical member where the optical member is set with excellent positional accuracy and whose structure is simple and which is easily manufactured in the fixing structure of the optical member used in the case that a lens is attached to a lens barrel. CONSTITUTION: An optical lens 6 is housed at the inside of the lens housing part 2a of the lens barrel 2, and is held between a fixing frame part 21 formed at the inside of the lens barrel 2 and a press ring 3 screwed in the lens barrel 2. An engaging recessed part 64 is formed at the optical lens 6, and the engaging recessed part 64 is fitted in the optical axis direction of the optical lens 6 in an engaging projecting part 22 formed on the side surface of the fixing frame part 21. The engaging recessed part 64 is formed on a resin layer 62 coat-formed by injection molding that the core lens body 61 of the optical member 6 is inserted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical member fixing structure, and more particularly to an improvement of a fixing structure suitable for attaching an optical lens to a lens barrel.

[0002]

2. Description of the Related Art Conventional optical lenses are usually fixed in a lens barrel with high accuracy before use. In this fixing structure, for example, as shown in FIG. 10, the optical lens 1 is introduced into the lens accommodating portion 2a formed in the lens barrel 2, and the collar portion 11 of the optical lens 1 is provided in the inner portion of the lens accommodating portion 2a. While contacting the formed fixed frame portion 21, the outer peripheral portion of the collar portion 11 is in contact with the inner peripheral portion of the lens housing portion 2a, and the holding ring 3 is screwed into the lens barrel 2 from the introduction side. The collar portion 11 is pressed down.

Here, the optical lens 1 has an optical surface portion 10 formed in the center, a collar portion 11 formed around the optical surface portion 10, and a D-cut portion 12 formed on the upper portion of the collar portion 11. A gate cut portion 13 is formed at the center of the D cut portion 12. When the optical lens 1 is formed by injection molding of synthetic resin, the gate cut portion 13 is used for the optical lens 1
Is formed when the is cut from the runner. In order to fix the optical lens 1, it is desirable that the gate cut portion 13 be cut so as not to project at the arc-shaped edge portion along the flange portion 11, but it is difficult to improve the precision of the cutting position in the process. In addition, since there is a risk that cracks may occur at the lens outer edge portion when the arc-shaped edge portion is cut, a D-cut portion 12 formed in a linear shape is provided, and the D-cut portion 12 is slightly projected. The gate cut portion 13 is formed by cutting as described above.

FIG. 11 shows another fixing structure of the conventional optical lens. Above the flange portion 41 of the optical lens 4, the flange portion 41 is divided into approximately two in the thickness direction and one of them is formed. D
The cut portion 42 is formed, and the gate cut portion 43 is formed to slightly project from the D cut portion 42. In this structure, the entire outer periphery of the collar portion 41 abuts on the inner peripheral surface of the lens housing portion 2a with a slight gap, and the optical lens 4 is fitted in the lens housing portion 2a.

FIG. 12 shows still another fixing structure of a conventional optical lens, in which the optical lens 5 is not provided with a collar portion, and the fixing frame portion 21 and the pressing ring 3 are directly provided on the curved surface thereof. Are in contact. D is on the outer edge of the optical lens 5.
The cut portion 52 is directly formed, and the gate cut portion 53 is formed to slightly project from the D cut portion 52.

[0006]

In the above-mentioned conventional optical lens fixing structure, especially in the case shown in FIGS. 10 and 12, the D-cut portion formed on the outer peripheral portion of the optical lens is separated from the inner surface of the lens barrel. Therefore, the optical lens may be tilted in the lens housing portion of the lens barrel and the optical axis may be tilted.
0 and FIG. 12, as well as the case shown in FIG. 11, a slight gap is required between the outer peripheral surface of the optical lens and the inner peripheral surface of the lens housing portion. There is a problem that a shift occurs. Furthermore, when the rotational symmetry of the lens surface of the optical lens with respect to the optical axis is low, positioning in the rotational direction is also necessary. However, such positioning is difficult with the above structure, and its positioning adjustment takes time.

Further, in the case shown in FIG. 11, the tilt of the optical axis can be reduced, but the D cut portion 4 as described above is used.
In order to form 2 and to provide a gate in this D-cut portion 42, it is necessary to provide a slide mechanism in the mold so that the cavity opens left and right from the one-dot chain line A shown in FIG. There is a problem that the mold becomes complicated and expensive, and maintenance becomes complicated.

Further, when the optical lens is formed by resin molding, generally, the molded optical lens is ejected from a mold by a push pin in order to release it. However, in the case of an optical lens, since the refraction surface requires optical precision, it is necessary to make the position where the thrust pin abuts outside the effective diameter of the lens. It may be deformed. Therefore, there is a problem that a complicated mechanism must be provided such that the movable side cavity is protruded for releasing the mold and is taken out by a gripping part such as a robot.

Therefore, the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an optical member which can be easily set in the lens barrel with high positional accuracy and which has a simple structure and is easy to manufacture. It is to realize a fixed structure.

[0010]

Means for Solving the Problems The means taken by the present invention for solving the above-mentioned problems is an optical member for fixing an optical member having at least a part formed of a synthetic resin to a support frame. In the fixing structure of No. 3, the portion formed of the synthetic resin and the portion of the support frame that abuts on the portion are provided with concave and convex portions that are fitted to each other in a direction substantially parallel to the optical axis of the optical member. It is characterized by

Here, the optical member is provided with a core member and a resin layer made of the synthetic resin coated on at least a part of the surface of the core member including a region where the concave and convex portions are to be formed, It is preferable that the resin layer forms an optical surface and the uneven portion is formed on the resin layer.

In this case, it is preferable that the uneven portion of the optical member is formed by moving a support member for supporting the core member when molding the resin layer.

In addition, the uneven portions may be pressed into each other.

Further, the uneven portions may be adhered to each other with an adhesive.

In this case, between the uneven portions,
It is desirable to provide a gap for accumulating the adhesive.

[0016]

According to the first aspect of the present invention, by providing the concave and convex portions which are fitted to the optical member and the support frame body, the optical member and the support frame body can be easily positioned, and the diameter of the optical member can be increased. The mounting accuracy in the direction of rotation and the accuracy of rotation can be improved, and the concave and convex portions are configured to be fitted to each other in a direction substantially parallel to the optical axis of the optical member. Is easy to install and fix, and
By providing the concavo-convex portion on the portion of the optical member formed of the synthetic resin, the concavo-convex portion can be formed by resin molding extremely easily and highly accurately. When the uneven portion is formed by resin molding, the uneven portion is configured so as to be fitted substantially parallel to the optical axis, and therefore, it is not necessary to complicate the mold structure, and the manufacturing can be performed at low cost.

According to the second aspect, after the core lens body is formed, the resin layer is coated on the core lens body to form an optical surface, that is, a refraction surface, a reflection surface, or the like.
Since sink marks, warpage, etc. can be reduced, the optical surface can be molded with high precision, and the uneven portion is molded at the same time as the resin layer, so that it can be efficiently manufactured without increasing the manufacturing cost. it can. In particular, as in claim 3,
The uneven portion may be formed by the movement of the support member for supporting the core member to be the insert.

According to the fourth and fifth aspects, since the uneven portion is fixed by press fitting or adhesion, it is not necessary to attach a separate component such as a retaining ring for fixing the optical member. The number can be reduced and the optical member can be attached and fixed easily and quickly.

According to the sixth aspect, since the gap is provided between the concave and convex portions, the adhesive collects in the gap when the optical member is bonded, so that the labor for adjusting the amount of the adhesive is reduced. The fixing work of the optical member is facilitated, and reliable fixing is possible.

[0020]

Embodiments of the fixing structure for an optical member according to the present invention will now be described with reference to the drawings.

[Embodiment 1] FIG. 1 shows Embodiment 1 of the fixing structure for an optical member according to the present invention. Optical lens 6
Is housed in the lens housing 2a formed in the lens barrel 2,
It is pressed and fixed by a holding ring 3 screwed into the lens barrel 2 in a state of being in contact with a fixed frame portion 21 formed in the inner portion of the lens housing portion 2a.

The optical lens 6 is composed of a core lens body 61 and a resin layer 62 covering the surface of the core lens body 61. The core lens body 61 has a flange portion 61a on the outer peripheral side of the lens effective diameter, and a thick flange portion 62a is formed by a resin layer 62 formed on the surface of the flange portion 61a. The collar portion 62a is sandwiched between the fixed frame portion 21 and the pressing ring 3. Engagement recesses 64 are formed on the back surface side of the flange portion 62a at three locations outside the effective lens diameter. The engagement recesses 64 are formed so as to project from the corresponding positions on the side surface of the fixed frame portion 21 of the lens barrel 2. It engages with the engaged protrusion 22.

The relationship between the engaging concave portion 64 and the engaging convex portion 22 is as follows.
The engagement protrusions 22 may be formed to be relatively tightly fitted to each other, or alternatively, the engagement protrusions 22 may be press-fitted into the engagement recesses 64. Further, the engagement between the engagement concave portion 64 and the engagement convex portion 22 may be formed so as to have some play, and in this case, both can be reliably adhered by an adhesive.

This embodiment is manufactured as follows. The lens barrel 2 is fixed to the lens housing portion 2a and the fixed frame portion 2 by injection molding.
1 and the engaging convex portion 22. The optical lens 6 has a core lens body 61 formed by injection molding as an insert, and is further subjected to a second injection molding with the same material to form a resin layer 62 on almost the entire surface of the core lens body 6. At this time, the core lens body 61 is formed in a shape substantially similar to the finally formed optical lens. In the two-time injection molding, since it is not necessary to form the molding resin thick, it is possible to prevent distortion, sink marks, warpage, inner bubbles, etc., which occur when the resin is solidified, and the core lens body 61 is formed. A highly accurate refracting surface required for the optical lens 6 can be formed on the surface of the. Further, a flat circular engagement recess 64 having a predetermined position and a predetermined size is simultaneously formed in the collar portion 62a.

An example of the mold structure at the time of insert molding will be described later in detail. To form the resin layer 62 around the core lens body 61 by one injection molding, the core lens body 61 is formed in the mold. It is necessary to support it by a predetermined support member so that it will be in a floating state. At this time, the supporting member is a supporting pin having the same cross section as the engaging recess 64, and the resin is injected while the core pin 61 is supported by the supporting pin, whereby the engaging recess 64 can be formed at the same time. .

The support pin is configured to be retractable into and out of the cavity as described later, but the engaging recess can be formed without operating the support pin during the molding process. Normally, the support pin is slightly retracted after the resin is injected into the cavity, and the engaging recess is adjusted to a predetermined depth for molding. On the contrary, when the engaging convex portion (boss) is formed on the optical lens 6, the support pin is excessively pulled into the core from the inside of the cavity, and the height of the engaging convex portion is adjusted by the amount of the pulling.

In this embodiment, after the optical lens 6 is introduced into the lens accommodating portion 2a of the lens barrel 2, the engaging convex portion 22 projecting from the inner surface of the lens barrel 2 is engaged with the engaging concave portion 64. Combine and position. At this time, conversely, the optical lens 6
It is the same even if the engaging convex portion is provided on the side of and the engaging concave portion is provided on the side of the lens barrel. The engagement protrusion 22 and the engagement recess 64 can be fixed to each other by press fitting or adhesion with an adhesive.
When the optical lens is fixed by the pressing ring 3 as in the present embodiment, the dimensional relationship between the engaging convex portion 22 and the engaging concave portion 64 is configured to be a gap fit of about h6 and H7. Preferably.

In this embodiment, the outer peripheral portion of the optical lens is separated from the inner peripheral surface of the lens housing portion 2a, and the optical lens 6 and the lens barrel 2 are positioned by the unevenness of the optical lens 6 in the optical axis direction. Therefore, the mounting is easy, and since the concavo-convex is formed in the optical axis direction which is the normal releasing direction, the optical lens 6 can be easily molded, and the concavo-convex shape can be formed with high accuracy, so that the mounting accuracy is also high. improves. Actual optical lens 6
Although the details of the molding will be described later, the mold structure does not need to have a complicated structure for forming the uneven portion,
It can be formed easily and with high precision. In this embodiment, the outer peripheral portion of the optical lens is formed so as to be separated from the inner peripheral surface of the lens accommodating portion 2a, so that any protrusion length can be obtained as long as it does not contact the inner peripheral surface of the lens accommodating portion 2a. Since the gate cut portion 63 may be formed as described above, the precision at the time of cutting the runner becomes unnecessary and the allowable range of the cutting position is wide.

Although the same number of engaging convex portions and engaging concave portions are provided in the above-mentioned embodiment, since the optical lens of this embodiment is optically rotationally symmetric, the engaging convex portions are formed at different pitches. By additionally forming the engaging concave portion, the mounting workability is further improved.

Example 2 FIG. 2 shows Example 2 of the optical lens fixing structure according to the present invention. In this embodiment, the optical lens 7 has a collarless shape, and the completed optical lens 7
A flange-less core lens body 71 having a shape substantially similar to the above, and a resin layer 72 obtained by molding and coating the surface of the core lens body 71 with a resin of the same material.
Consists of Also in this embodiment, the optical lens 7 is sandwiched between the fixed frame portion 21 and the holding ring 3, and the outer peripheral surface thereof is separated from the inner peripheral surface of the lens housing portion 2a. Engagement recesses 74 formed in the resin layer 72 are formed at three positions on the outer edge of the optical lens 7, and the fixing frame portions 2 are formed in the engagement recesses 74.
Engagement convex portions 22 formed at three positions of 1 are fitted.
Note that the gate cut portion 73 may be formed by appropriately cutting the runner connection portion as long as it is within a range that does not interfere with the inner surface of the lens housing portion 2a, as in the first embodiment.

As shown in FIG. 2B, the optical lens 7 of this embodiment is a rotationally asymmetric aspherical lens, and the refracting surfaces 7a and 7b are formed on different curved surfaces. Therefore, when the optical lens 7 is attached to the lens barrel 2, the rotation angle of the optical lens 7 must also be positioned. In this embodiment, the rotation angle of the optical lens 7 is engaged with the engaging convex portion. Since it is determined by the fitting with the recess, the angle adjustment is unnecessary. In this case, it is possible to form the engaging convex portion and the engaging concave portion at equal angular intervals and set the optical lens 7 at a regular angle with the gate cut portion 73 as a mark, but the engaging convex portion is preferable. Also, it is preferable that the engaging recesses have unequal angular intervals so that they are not accidentally set at different angles.

Example 3 FIG. 3 shows Example 3 of the optical lens fixing structure according to the present invention. In this embodiment, an annular engaging concave portion 84 is formed on the surface of the flange portion 82a of the optical lens 8 including the core lens body 81 and the resin layer 82.
Is formed in the engaging recess 84.
An annular engaging convex portion 23, which is similarly formed, is fitted to the side surface of the.

The engaging convex portion 23 and the engaging concave portion 84 can be press-fitted or can be adhered to each other with an adhesive as in the above embodiment. Here, as shown in FIG.
The inner diameter of the engaging convex portion 23 and the inner diameter of the engaging concave portion 84 are formed to have substantially the same size, and a predetermined gap is provided between the outer diameter of the engaging convex portion 23 and the outer diameter of the engaging concave portion 84. By forming it so as to have, both are positioned by the inner diameter, and the positional accuracy of the optical axis of the optical lens 8 can be improved.

[Embodiment 4] FIG. 4 shows Embodiment 4 of the fixing structure for an optical lens according to the present invention. In this embodiment, the optical lens 9 is a rotationally asymmetric aspherical lens similar to that of the second embodiment, and the refracting surfaces 9a and 9b are formed on different curved surfaces. The optical lens 9 is formed by coating a resin layer 92 of the same material on the surface of a core lens body 91, and an engaging convex portion 94 is formed on the resin layer 92 at three positions on the outer edge portion of the optical lens 9. Has been formed.

On the other hand, the fixed frame portion 21 formed so as to face the lens accommodating portion 2a of the lens barrel 2 has a through hole 24 formed from the side surface thereof in the optical axis direction of the optical lens 9.
The engaging protrusion 94 is fitted in the through hole 24. Since the optical lens 9 is an asymmetric lens, it is fixed in a predetermined posture by fitting the engaging convex portion 94 and the through hole 24. In this embodiment, the optical lens 9 is positioned in the radial direction by bringing the outer peripheral surface of the optical lens 9 into contact with the inner peripheral surface of the lens accommodating portion 2a, and the optical lens 9 is positioned in the rotation direction by the engaging convex portion. This is done by fitting the 94 and the through hole 24 together. Of course, positioning in both directions may be performed only by the engaging portion. Here, the positioning of the optical lens 9 in the radial direction may be performed by both abutting the outer peripheral surface of the optical lens and the inner peripheral surface of the lens housing portion and fitting the engaging convex portion and the through hole. By doing so, it is particularly effective when the engaging projection 94 cannot be formed to have a sufficient strength in terms of design.

[Embodiment 5] FIG. 5 shows Embodiment 5 of the optical lens fixing structure according to the present invention. In this embodiment, as shown in FIGS. 5A and 5B, the lenticular lens 10 is attached and fixed in the lens barrel 2. The lenticular lens 10 is composed of a rectangular plate-shaped core lens body 15 and a resin layer 16 formed by coating the surface of the core lens body 15 with a resin of the same material. The core lens body 15 is formed in a shape substantially similar to that of the lenticular lens 10, and has a corrugated surface 15a in which a plurality of arc-shaped cross-section portions are arranged side by side. The resin layer 16 is also substantially the core lens body 15.
It has a similar surface shape, and a refraction surface 16a of the same shape is formed on the surface of the corrugated surface 15a.

Refractive surface 16a of the lenticular lens 10
A pair of engaging projections 17 are formed on the upper and lower sides of the engaging projections 17, and the engaging projections 17 are press-fitted into the through holes 25 formed in the fixed frame portion 21 of the lens barrel 2. In this embodiment, unlike the above-described embodiments, the lenticular lens 10 is fixed without using a holding ring, so that the number of parts can be reduced and the assembly is easy.

FIG. 5C shows a modification of the fifth embodiment. Like the lenticular lens 10, the lenticular lens 30 includes a core lens body 35 having a corrugated surface 35a and a resin layer 36 having a refracting surface 36a, and a pair of engaging recesses 37 above and below the refracting surface 36a. It is molded. The engagement concave portion 37 is the fixed frame portion 21 of the lens barrel 2.
It is fitted to the engaging convex portion 26 formed on the side surface of the. The engaging concave portion 37 is filled with an adhesive, and the engaging convex portion 26 is adhered while being introduced.

The height of the engaging convex portion 26 is formed to be slightly lower than the depth of the engaging concave portion 37 so that a slight gap is formed inside the engaging concave portion 37 when the both are fitted. Has become. This gap serves as an adhesive reservoir, and the work can be performed without precisely adjusting the amount of the adhesive applied at the time of adhesion. This embodiment is shown in FIG.
The lenticular lens can be more firmly fixed to the lens barrel 2 than that shown in FIG.

FIG. 6 shows the essential parts of another fixing structure applicable to each of the above embodiments. 6 (a) to 6 (e)
Shows the shapes of the engaging projections and the engaging recesses respectively formed on the optical member such as the optical lens and the supporting frame such as the lens barrel. In this way, the uneven shape is cylindrical, conical,
It may be configured in various shapes such as a truncated cone shape. In the illustrated concavo-convex shape, either the optical member or the lens barrel may be provided with a convex portion or a concave portion, or both are provided with a convex portion and a concave portion so that both convex portions fit into corresponding concave portions on the other side. You may form in. Further, the engaging convex portion may be a protrusion and the engaging concave portion may be a groove. Further, the optical member may be provided with the engaging portion on either the lens surface or the flange surface, or may be provided on both of them.

FIG. 6F shows a cross section of the optical lens 40 having an engaging convex portion (boss) 45 for positioning at the outer edge portion. Such an optical lens 40 can be positioned by the engaging convex portion 45 as described in each of the above-described embodiments, and the engaging convex portion 45 is formed so as to protrude beyond the refracting surface 40a, so that the tray for transporting is provided. When placed on a table or assembly table, its refracting surface 40a does not contact the mounting surface,
It has an effect that scratches and dirt do not adhere to the refracting surface 40a.

Although each of the above embodiments has been described with respect to a plastic lens molded in two steps, the present invention can be applied to a lens molded once or in three or more steps.
It can also be applied to other optical members such as plastic reflecting mirrors, diffraction gratings, prisms, etc., and at least part of the surface is made of synthetic resin, such as a compound lens in which the surface of optical glass is coated with synthetic resin. It also includes the following. Further, in an optical member molded in a plurality of steps, it is possible to form a compound optical member such as a compound lens by using different materials in each step, so that desired optical characteristics can be realized.

Finally, an example of the mold structure for forming the optical members such as the optical lenses and lenticular lenses of the above embodiments by injection molding will be described with reference to FIGS. 7 to 9. As shown in FIG. 7, a fixed die plate 102 is attached to a fixed die plate 101 of the injection molding machine, and a fixed core 103 is fixed in the fixed die plate 102. A mounting plate 104 and a drive plate 105 are provided in the fixed core 103.
Is accommodated slidably in the mold opening direction, and the mounting plate 104 and the drive plate 105 are fixed to each other with a plurality of support pins 107 and pressure receiving pins 108 sandwiched therebetween. An elastic spring 106 is held in a compressed state between the drive plate 105 and the fixed die plate 101.

A movable side mold plate 202 is attached to the movable side die plate 201, and a movable side core 203 is fixed inside the movable side mold plate 202. Movable core 203
A mounting plate 204 and a drive plate 205 are slidably housed inside the mold, and a plurality of support pins 207 and pressure receiving pins 208 are provided between the mounting plate 204 and the drive plate 205.
Are clamped to each other and fixed to each other. Drive plate 20
5 between the movable die plate 201 and the movable die plate 20.
6 is held in a compressed state. Movable die plate 2
A projecting rod 209 is formed so as to be retractable through a through hole provided at 01, and the tip of the projecting rod 209 is arranged so as to be able to press the drive plate 205.

The resin supplied from the injection nozzle (not shown) is introduced from the gate 303 through the introduction holes 301 and 302,
It is injected into the cavity 304 formed by the contact surfaces of the fixed core 103 and the movable core 203. Introduction hole 30
The pressure receiving surface formed at the tip of the pressure receiving pins 108 and 208 faces 1. Usually, the elastic springs 106, 20
By the elastic force of 6, the support pin 10 is inserted in the cavity 304.
When the core lens body C, which is an insert, is introduced into a state in which it is supported by the support pins 107 and mold closing is performed, as shown in FIG. The position of the support pin 107 is held by the elastic coefficient, and the elastic spring 206 having an elastic coefficient smaller than that of the elastic spring 106 is slightly compressed and the support pin 207 is retracted to some extent. In this way, the core lens body C is sandwiched by the support pins 107 and 207 by the elastic force.

When the resin is introduced from the introduction hole 301 in this state, as shown in FIG. 8, the resin is injected from the gate 303 into the cavity 304 to fill the periphery of the core lens body C, and The pressure receiving surface facing the introduction hole 301 is pressed by the injection pressure, so that the pressure receiving pin 1
The support pins 107 and 207 retreat from the inside of the cavity 304 because the drive plates 105 and 205 retreat against the elasticity of the elastic springs 106 and 206 by retracting the drive plates 08 and 208. In this way, the resin is cured in the cavity 304 with the core lens body C floating in the center, and the optical lens or the lenticular lens of each of the above-described embodiments is formed.

Generally, the resin injection pressure is the cavity 304.
Since the temperature rises as the resin is injected into the inside, the pressure receiving areas of the pressure receiving pins 108 and 208 and the maximum pressure of the resin are set so that the support pins retract when almost all of the periphery of the core lens body C is filled with the resin. The elastic springs 106 and 206 are designed in consideration of the elastic coefficients of each other.

Finally, when the resin in the cavity 304 is cured, the fixed side mold plate 102 and the movable side mold plate 202 are opened, and the projecting rod 209 projects the drive plate 205, so that the support pin and the pressure receiving pin are molded. Stick out.
Here, the protrusion of the molded product may be performed by a drive plate and a protrusion pin which are separately provided.

As described above, since the support pin is automatically retracted by the resin pressure, the entire periphery of the insert can be covered without leaving the tip shape of the support pin in the molded product. At this time, the engaging protrusions or engaging recesses of the above-described embodiments are formed by the recesses or protrusions provided on the inner surface of the cavity 304. However, since the support pin is normally arranged so as to abut on the flange portion of the core lens body, the support pin may be molded in a protruding state without protruding and retracting.
In this case, since the recess is formed on the surface of the molded product by the protrusion of the support pin, this recess may be used as the engaging recess.

When the support pin is brought into contact with a flat plate-like portion such as the above-mentioned collar portion, the tip end surface of the support pin may be a flat surface, but when brought into contact with the curved surface of the lens, the support pin is supported. It is desirable to form the tip end surface of the pin into a curved surface. In particular,
By providing the support pin with a tip end surface that matches the outer surface of the molded product, the tip end surface of the retracted support pin is changed to the cavity 30.
Since it can be configured so as to be continuous with the inner surface of 4, the molding can be performed without leaving traces of the support pins on the surface of the molded product even if the core lens body is not provided with the flange portion.

FIG. 9 shows a method of forming the engaging concave portion or the engaging convex portion described in each of the above embodiments by controlling the movement amount of the support pin 207. FIG. 9A shows a case where an engaging concave portion is formed on the surface of the flange portion of the optical lens. Support pin 207 supporting core lens body C
However, after the resin has been injected, the resin is drawn in from the cavity 304 and stopped at the position shown in the drawing, whereby the engaging recess D is formed on the flange surface of the optical lens. Further, FIG. 9 (b) similarly shows a case where the engaging convex portion is formed on the surface of the collar portion. In this case, the tip end surface of the support pin 207 is drawn in more than the inner surface of the cavity 304, and the engaging protrusion E having a height equal to the amount of the extra drawing is formed.

[0052]

As described above, the present invention has the following effects. According to the first aspect, by providing the concave and convex portions that are fitted to the optical member and the support frame body, the positioning of the optical member and the support frame body can be easily performed, and the radial direction and rotation of the optical member can be performed. The mounting accuracy of the optical member can be increased, and the concave and convex portions are configured to be fitted to each other in a direction substantially parallel to the optical axis of the optical member, so that It is easy to fix, and by providing the uneven portion on the portion of the optical member formed of the synthetic resin, the uneven portion can be formed extremely easily and highly accurately by resin molding. When the uneven portion is formed by resin molding, the uneven portion is configured so as to be fitted substantially parallel to the optical axis, and therefore, it is not necessary to complicate the mold structure, and the manufacturing can be performed at low cost.

According to the second and third aspects, after the core lens body is formed, the resin layer is coated on the core lens body to form an optical surface, that is, a refraction surface, a reflection surface, or the like. Since distortion, sink marks, warpage, etc. can be reduced, the optical surface can be molded with high precision, and
Since the concavo-convex portion is molded at the same time as the resin layer, it is possible to efficiently perform the production without increasing the manufacturing cost.

According to the fourth and fifth aspects, by fixing the concave and convex portion by press fitting or adhesion, it is not necessary to attach a separate component such as a retaining ring for fixing the optical member. Therefore, the number of components can be reduced. The number can be reduced and the optical member can be attached and fixed easily and quickly.

According to the sixth aspect, since the gap is provided between the concavo-convex portions, the adhesive collects in the gap when the optical member is bonded, so that the labor for adjusting the amount of the adhesive is reduced, The fixing work of the optical member is facilitated, and reliable fixing is possible.

[Brief description of drawings]

FIG. 1 is a sectional view (a) showing a first embodiment of an optical member fixing structure according to the present invention and a front view (b) showing a shape of an optical lens of the first embodiment.

FIG. 2 is a sectional view (a) showing a second embodiment of the optical member fixing structure according to the present invention and a rear view (b) showing the shape of the optical lens of the second embodiment.

FIG. 3 is a sectional view (a) showing a third embodiment of the optical member fixing structure according to the present invention, a front view (b) showing the shape of the optical lens of the third embodiment, and a concavo-convex portion of the third embodiment. It is an expanded sectional view (c) which shows a structure.

FIG. 4 is a sectional view (a) showing a fourth embodiment of the optical member fixing structure according to the present invention and a rear view (b) showing the shape of the optical lens of the fourth embodiment.

FIG. 5 is a sectional view (a) showing an optical member fixing structure according to a fifth embodiment of the present invention, a rear view (b) showing the shape of a lenticular lens of the same embodiment, and a structure of a modified example of the fifth embodiment. It is sectional drawing (c) which shows.

FIG. 6 is enlarged sectional views (a) to (e) showing the concavo-convex shape applicable to each embodiment of the fixing structure of the optical member according to the present invention, and the structure of the optical lens applicable to each embodiment. It is sectional drawing (f).

FIG. 7 is a schematic cross-sectional view showing the structure of an injection molding die applicable to the manufacture of the optical member of each embodiment of the optical member fixing structure according to the present invention.

8 is a schematic cross-sectional view showing a state of the injection molding die shown in FIG. 7 during resin injection.

9A and 9B are explanatory views (a) and (b) for explaining a case where a concavo-convex shape is molded by the injection molding die shown in FIG. 7.

FIG. 10 is a sectional view (a) showing an example of a conventional optical member fixing structure and a front view (b) showing the shape of an optical lens of the same example.

FIG. 11 is a sectional view (a) showing another example of a conventional optical member fixing structure and a front view (b) showing the shape of the optical lens of the same example.

FIG. 12 is a cross-sectional view (a) showing another example of a conventional optical member fixing structure and a rear view (b) showing the shape of the optical lens of the same example.

[Explanation of symbols]

 2 Lens barrel 2a Lens accommodation part 3 Holding ring 6 Optical lens 21 Fixed frame part 22 Engagement convex part 61 Core lens body 62 Resin layer 62a Collar part 63 Gate cut part 64 Engagement concave part

Claims (6)

[Claims] 1. An optical member fixing structure for fixing an optical member, at least a portion of which is made of synthetic resin, to a support frame, wherein the portion made of synthetic resin and the portion are in contact with each other. A fixing structure for an optical member, characterized in that an uneven portion which is fitted to each other in the direction substantially parallel to the optical axis of the optical member is provided on the support frame portion. 2. The optical member according to claim 1, further comprising: a core member; and a resin layer made of the synthetic resin and coated on a surface of the core member including a region where the concave and convex portions are to be formed. A fixing structure for an optical member, characterized in that an optical surface is formed by the resin layer and the uneven portion is formed on the resin layer. 3. The fixing of an optical member according to claim 2, wherein the uneven portion of the optical member is formed by moving a supporting member for supporting the core member when molding the resin layer. Construction. 4. The fixing structure for an optical member according to claim 1, wherein the concavo-convex portions are press-fitted to each other. 5. The fixing structure for an optical member according to claim 1, wherein the concavo-convex portion is adhered to each other with an adhesive. 6. The method according to claim 5, wherein between the uneven portions,
A fixing structure for an optical member, characterized in that a gap for accumulating the adhesive is provided.