JPH0957771A - Method for manufacturing composite optical element - Google Patents

Abstract

(57) Abstract: A composite optical element having a small diameter is manufactured. An energy-curable resin is supplied to a molding surface of an optical element base material, and the mold and the optical element base material are relatively brought close to each other to spread the resin to spread the mold and the optical element base material. In the method of manufacturing a composite optical element, the resin layer is formed by curing a resin layer by irradiating energy after a desired resin layer is formed between A portion of 3 which is related to optical performance is formed in a non-axisymmetric shape with respect to the central axis of the optical element substrate 2,
A mold is formed by applying a load to a portion of the optical element substrate 2 which is irrelevant to the optical performance within a circle whose diameter is the maximum effective diameter of the resin layer 3 centered on a point on the central axis of the optical element substrate 2. And the cured resin layer 3 are peeled off, and the base material portion for applying a peeling load to the outside of the effective diameter is unnecessary.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a method for manufacturing a composite optical element in which a resin layer is mounted on an optical element substrate.

[0002]

2. Description of the Related Art As the prior art, Japanese Patent Laid-Open No. 4-1447
There is a publication No. 18. In this method, when the mold and the cured resin layer are peeled off, a load is applied to the part of the resin layer surface that is not related to the optical performance (the part outside the effective diameter), so that the mold and the resin layer can be easily separated. However, the shape of the portion related to the optical performance of the resin layer (the portion within the effective diameter) is symmetrical about the central axis.

[0003]

However, in the method of the prior art described above, when the mold and the cured resin layer are peeled off, a load is applied to a portion of the resin layer that is not related to the optical performance. It is necessary to make the diameter of the optical element larger than the effective diameter to some extent. If the part to which the load is applied is narrow, the stress will be concentrated in the radial direction, so the resin part within the effective diameter will be affected by the deformation of the resin part outside the effective diameter, and the resin layer surface will have the desired optical surface shape. There is a problem that it does not become. In addition, the problem that the optical element substrate is damaged may occur at the same time.

Therefore, if the width of the portion to which the load is applied is increased, the diameter of the composite optical element itself is inevitably increased.
As a matter of course, the product using the composite optical element manufactured here also becomes large.

However, in the field of cameras and the like, there is intense competition for product miniaturization, and it is not desirable to increase the number of parts that are not directly related to performance. In particular, in a product such as a compact camera, in which miniaturization itself is one of the merits, it is a fatal problem that attractiveness is significantly impaired.

The present invention has been made in view of the above problems of the prior art, and a load is applied to the outside of the effective diameter of the resin layer related to the optical performance when the mold and the cured resin layer are peeled off. It is an object of the present invention to provide a method for manufacturing a composite optical element, which can manufacture a composite optical element having a small diameter without the need to provide a portion for.

[0007]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. According to a first aspect of the present invention, an energy-curable resin is supplied to the molding surface of the optical element base material, and the mold and the optical element base material are relatively brought close to each other to spread the resin to spread the resin and the mold. After forming a desired resin layer between the substrate and the substrate, the resin layer is cured by irradiation with energy, and the resin is formed in the method for producing a composite optical element in which the cured resin layer and the mold are separated. The part of the layer that is related to optical performance is made non-axisymmetric with respect to the central axis of the optical element substrate molding surface, and the resin layer centered on a point on the central axis of the optical element substrate molding surface is effective It was decided to apply a load to a portion having no relation to the optical performance within a circle having the maximum value of the diameter as a diameter, and to separate the mold from the cured resin layer.

According to a second aspect of the present invention, in the structure of the first aspect, the portion unrelated to the optical performance is the resin layer.

According to a third aspect of the present invention, in the structure of the first aspect, the portion unrelated to the optical performance is the optical element substrate. .

The operation of claim 1 will be described. Currently used films are generally rectangular, so that the light rays that reach the film surface do not necessarily have to be axisymmetrical about the central axis of the optical element substrate. Therefore, the effective diameter itself, which is related to the optical performance of the composite optical element, does not necessarily have to be axisymmetric.

However, although glass is often used as the base material of the composite optical element, it is more costly to process glass into a non-axisymmetric shape than to process it into an axisymmetric shape. Further, in manufacturing a composite type optical element, a resin placed on a base material is pressed by a mold to form a resin layer. Therefore, when the base material has a non-axisymmetric shape, work such as positioning during manufacturing is performed. Is not preferable because the number of operations increases. On the other hand, the resin layer mounted on the base material can be formed to have a free shape to some extent. Since the mold for forming the resin layer can be used for a long time once manufactured, the cost can be almost ignored as compared with the case where the base material is processed into a non-axisymmetric shape.

Therefore, by placing a resin layer having a non-axisymmetric portion in relation to the optical performance on a substrate having a central axis symmetrical shape, the optical performance is improved when the mold and the cured resin layer are peeled off. By applying a load to an irrelevant portion, it becomes possible to easily separate the mold and the resin layer by the same means as in the conventional technique.

According to the second aspect of the invention, the resin layer itself is formed in an axially symmetric shape, and the portion of the resin layer that is related to the optical performance is formed in a non-axisymmetrical shape, whereby the curing of the resin layer is completed. Immediately after that, the mold and the resin layer are first peeled off at a portion unrelated to the optical performance of the resin layer, and then the mold and the composite optical element are peeled off by applying a load to the resin layer after peeling the mold. It

According to the third aspect of the present invention, the resin layer itself has a non-axisymmetric shape, and a load is applied to the portion of the base material on which the resin layer is not formed after the resin layer is completely cured. And the composite optical element is peeled off.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment of the Invention] FIG.
A description will be given based on FIG. As shown in FIG. 1, a glass optical element substrate (hereinafter, referred to as substrate) 2 having concave surfaces on both sides 2
The required amount of resin 5 has been discharged to. The radius of curvature of the molding surface (the surface on which the resin layer is placed) of the base material 2 is 100 mm, and the radius of curvature of the non-molding surface (the surface on which the resin layer is not mounted) is 80 mm and the outer diameter is 25 mm. Also, the required amount of the resin 5 is assumed to be obtained in advance.

On the other hand, the mold 1 used in this embodiment has an optical surface (a surface for pressing the resin layer) 1a for forming a desired resin layer surface on the base material 2 and has a central axis. It is held in the same manner as the central axis of the base material 2 so as to be vertically movable. The shape (outline) of the outer peripheral portion of the optical surface 1a of the mold 1 is a non-axisymmetric shape, and the point on the central axis of the optical surface 1a of the mold 1 is the origin and is on the xy plane perpendicular to the central axis. When each point on the outer peripheral portion of the optical surface 1a of the mold 1 is moved in parallel with the central axis, a range of 50 degrees up and down with respect to the x axis is 25 mm in diameter as shown in FIG.
The shape is a circular arc 1b, and the other portion is a straight line 1c having a constant y coordinate connecting the end points of the two circular arcs 1b.

Next, a process of forming the resin layer 3 having a desired thickness by spreading the resin 5 on the optical surface 1a by lowering the mold 1 and bringing it closer to the base material 2 will be described. The part related to the optical performance of the resin layer 3 formed on the base material 2 is an arc having a diameter of 24 mm in the range of 45 degrees up and down with respect to the x axis, and the other parts have a constant y coordinate connecting the two end points. The area surrounded by the straight line. When the mold 1 is lowered and the resin 5 is pressed, the resin 5 is shown in FIG. 3 (a cross-sectional view including the central axis viewed from the x-axis direction) until immediately before the resin 5 protrudes from the outer peripheral portion of the optical surface 1 a of the mold 1. As shown in FIG. 4 (cross-sectional view including the central axis when viewed from the y-axis direction), the resin 5 spreads concentrically on the base material 2. Then, when the mold 1 is further lowered, the resin 5 protrudes from the straight line 1c shaped portion of the optical surface 1a of the mold 1. When the resin 5 protrudes from the outer peripheral portion of the optical surface 1a of the mold 1 (the surface of the protruding portion is referred to as 5a), the speed at which the resin 5 spreads in the radial direction differs between the resin 5 which is still pressed and the other portions,
As shown in FIG. 5 (cross-sectional view including the central axis viewed from the x-axis direction) and FIG. 6 (cross-sectional view including the central axis viewed from the y-direction), the shape of the resin 5 on the base material 2 is concentric. Disappear.
That is, the portion 5a of the resin 5 protruding from the outer peripheral portion of the optical surface 1a of the mold 1 is not subjected to the pressure caused by the lowering of the mold 1, so that it does not spread in the radial direction but spreads in the vertical direction. . And the resin layer 3 on the central axis
The mold 1 is lowered to a desired thickness to form the desired resin layer 3. At this time, as shown in FIG. 7, it is necessary to previously adjust the amount of the resin 5 discharged onto the base material 2 so that the resin 5 is spread over the entire region related to the optical performance. Note that FIG. 7 is a plan view of the resin layer 3 as seen from the direction parallel to the central axis of the substrate 2.

Next, in this state, ultraviolet rays are irradiated from below the base material 2 by means not shown to cure the resin layer 3. Then, when the irradiation of energy is completed, a close contact body in which the mold 1, the base material 2 and the cured resin layer 3 are integrated is formed.

Next, as shown in FIG. 8, when the contact member is raised, the peeling member 4 previously provided above the portion of the base material 2 on which the resin layer 3 is not formed is removed. It comes into contact with the surface 2a of the second. Then, the load is first concentrated on the portion on the surface 2a of the base material 2 where the peeling member 4 is in contact, and then the load is dispersed over the entire base material 2. Then, if the contact body is continuously raised as it is, the resin layer 3 is separated from the mold 1 as shown in FIG. 9, and the composite optical element 6 in which the base material 2 and the resin layer 3 are integrated is obtained. FIG. 10 shows a view of the manufactured composite optical element 6 as seen from above.

According to the manufacturing method of the embodiment of the present invention,
By making the base material 2 slightly larger than the maximum effective diameter,
The mold 1 and the cured resin layer 3 can be easily peeled off.

[Second Embodiment of the Invention] A second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 11, resin 15 is applied to the glass substrate 12 having concave surfaces on both sides.
Is being discharged in the required amount. The radius of curvature of the molding surface (the surface on which the resin layer is placed) of the base material 12 is 100 mm, the radius of curvature of the non-molding surface (the surface on which the resin layer is not mounted) is 80 mm, and the outer diameter is 42.
mm. The required amount of the resin 15 is assumed to be obtained in advance.

On the other hand, the mold 11 used in this embodiment is
As shown in FIGS. 13 and 14, the A type 11a and the B type 11b, which are relatively movable in the axial direction, are combined, and the end faces of the A type 11a and the B type 11b are made to have no step and the resin 15 is formed. Formed on the optical surface of the mold that presses, with a diameter of 42 m
It has an axisymmetric shape of m. That is, when a point on the center axis of the mold optical surface of the mold 11 is the origin, the center axis is the z axis, and the x and y axes are set in the directions perpendicular to the center axis and mutually perpendicular, the result is shown in FIG. So the distance from the x-axis is 1
It is divided into two vertically movable parts, an A type 11a that presses at a position of 9 mm including a part related to optical performance and a B type 11b that presses only a part unrelated to optical performance. , B mold 11b both have an optical surface for forming a desired resin layer surface, and the central axis of the mold 11 is the same as the central axis of the base material 12.

Next, a method for manufacturing the composite optical element will be described. First, as shown in FIG. 13, in the state where there is no step at the boundary between the optical surface of the A type 11a and the optical surface of the B type 11b,
The resin 15 is spread on the base material 12 by lowering the mold 11 and bringing it closer to the base material 12 to form a resin layer 13 having a desired thickness.
The lowering of the mold 11 is stopped at the position where the mold is formed.

Next, in this state, ultraviolet rays are irradiated from below the base material 12 by means not shown to cure the resin layer 13. Then, when the irradiation of energy is completed, a contact body in which the mold 11, the base material 12, and the cured resin layer 13 are integrated is formed.

Next, as shown in FIG. 14, the B mold 11b is raised and the part of the B mold 11b irrelevant to the optical performance is peeled off from the contact body. At this time, the area of the optical surface where the B type 11b is in close contact with the resin layer 13 is the same as that of the A type 11a.
It is smaller than the area of the optical surface that is in close contact with
Since a and the resin layer 13 are fixed to each other, the B type 11
b can be easily peeled off from the surface 13a of the resin layer 13. Then, after peeling the B type 11b from the surface of the resin layer 13,
The peeling member 14, which is provided outside the effective diameter of the base material 12 in advance, is moved above the surface 13a of the resin layer 13 in the portion where the B mold 11b is peeled off.

Next, the A type 11a, the resin layer 13 and the substrate 12
When the adhered body of is lifted, the peeling member 14 becomes the resin layer 1
The surface 13a of the resin layer 13 is first contacted with the surface 13a of
The load is concentrated on the portion where the upper peeling member 14 is in contact,
After that, the load is dispersed from the resin layer 13 to the entire substrate 12. Then, if the above-mentioned close contact is continuously raised as it is, as shown in FIG. 15, from the A type 11a to the base material 12 and the resin layer 1.
The composite optical element 16 in which 3 is integrated is peeled off. On the surface 13a of the resin layer 13 of the manufactured composite optical element 16, there are traces of a boundary line between the optical surfaces of the A-type 11a and the B-type 11b forming the mold optical surface of the mold 11, and peeling. Although a trace of pressing by the member 14 remains, this portion has no relation to the optical performance, so there is no problem in terms of performance.

According to the manufacturing method of the embodiment of the present invention,
Only by making the base material 12 slightly larger than the maximum effective diameter, the mold 11 and the cured resin layer 13 can be easily peeled off.

[0028]

As described above, according to the method for manufacturing a composite optical element according to claims 1 to 3 of the present invention, the optical element substrate is made smaller than the maximum effective diameter related to the optical performance of the resin layer. By simply increasing the size, the mold and the cured resin layer can be easily peeled off, and a composite optical element that can meet the demand for downsizing of the product can be manufactured.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a step of a first embodiment of the present invention, showing a state where a resin is discharged onto a base material.

FIG. 2 is a plan view showing an optical surface of a mold used in the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a step of the first embodiment of the present invention, as seen from the direction of the x-axis in FIG.

FIG. 4 is a cross-sectional view showing a step of the first embodiment of the present invention, as seen from the direction of the y-axis in FIG.

5 is a cross-sectional view showing a step of the first embodiment of the present invention, as seen from the direction of the x-axis in FIG. 2. FIG.

FIG. 6 is a cross-sectional view showing a step of the first embodiment of the present invention, as seen from the direction of the y-axis in FIG.

FIG. 7 is a plan view showing a resin layer formed on a base material according to the first embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a step of the first embodiment of the present invention, showing a state where the resin layer and the mold are peeled off.

FIG. 9 is a cross-sectional view showing a step of the first embodiment of the present invention, showing a state where the mold and the composite optical element are separated.

FIG. 10 is a plan view showing a composite optical element manufactured according to the first embodiment of the present invention.

FIG. 11 is a cross-sectional view showing a step of the second embodiment of the present invention, showing a state where resin is discharged onto the base material.

FIG. 12 is a plan view showing an optical surface of a mold used in Embodiment 2 of the present invention.

FIG. 13 is a cross-sectional view showing a step of the second embodiment of the present invention, showing a state in which a resin layer has been formed.

FIG. 14 is a cross-sectional view showing a step of the second embodiment of the present invention, showing a state where one mold is separated from the resin.

FIG. 15 is a cross-sectional view showing a step of the second embodiment of the present invention, showing a state where the mold and the composite optical element are separated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1,11 Mold 2,12 Optical element base material 3,13 Resin layer 4,14 Separation member 5,15 Resin 6,16 Composite type optical element

Claims (3)

[Claims] 1. An energy-curable resin is supplied to a molding surface of an optical element base material, and the mold and the optical element base material are relatively brought close to each other to spread the resin to spread the mold and the optical element base material. After forming a desired resin layer between and, the resin layer is cured by irradiation with energy, and then the cured resin layer and the mold are separated, Of the effective diameter of the resin layer centered on a point on the central axis of the optical element substrate molding surface, the portion related to optical performance is made non-axisymmetric with respect to the central axis of the optical element substrate molding surface. A method for producing a composite-type optical element, characterized in that a load is applied to a portion having no relation to optical performance within a circle having a maximum value as a diameter to separate the mold from the cured resin layer. 2. The method for producing a composite optical element according to claim 1, wherein the portion unrelated to the optical performance is a resin layer. 3. The method for producing a composite optical element according to claim 1, wherein the portion unrelated to the optical performance is an optical element base material.