JPH0899367A - Manufacture of compound optical element - Google Patents

Abstract

PURPOSE: To enable a compound optical element to be manufactured without the need of shifting the mold and the central axis of the material by putting the mold and a base material in parallel in a close relation during the curing period of resin in the art where energy curing type resin is applied and then the resin layer is cured after molding by a mold. CONSTITUTION: In the case of a compound optical element being manufactured, UV ray curing type resin is discharged on the molding surface of a base material 2. Next, the mold 1 being in the same place as the central axis of the base material 2 in its central axis is lowered so as to spread resin 5 and mold a resin layer 3 with a predetermined thickness. The entire surface of the resin layer is irradiated with UV rays from the lower side of the base material 2 to start the curing of the resin layer 3, and in this instance, the mold is put close to the direction of the base material so that the rate of resin curing contraction is compensated during the period of an irradiation of energy. As a result, in the resin outer peripheral part, the base material and mold come in a close relation each other without generating any friction between the base material side surface and the centering member, thereby avoiding the shift of the central axis between the base material and the mold. Following this, the resin layer and mold are separated each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a composite type optical element in which a resin layer is placed on an optical element base material.

[0002]

2. Description of the Related Art Conventionally, as a technique of this kind, Japanese Patent Laid-Open No.
No. 184813 is known. This is a method of holding and positioning the outer peripheral portion of the base material when aligning the central axes of the mold and the base material. According to this, the central axes of the die and the base material can be accurately matched regardless of the radius of curvature of the base material. The publication also discloses a method of keeping the pressure of the mold pressed by the mold during irradiation of energy so that the mold follows the curing shrinkage of the resin.

[0003]

However, the above-mentioned conventional technique has the following problems.

Since the resin layer of the composite optical element has a different thickness depending on the distance from the central axis, it is general that the curing shrinkage amount of the resin also varies depending on the distance from the central axis. Further, the base material is more likely to be deformed when an external force is applied to a portion far from the central axis of the base material than an external force is applied to a portion close to the central axis of the base material. Further, the meniscus lens is more likely to be deformed than the biconcave or biconvex lens. In other words, the amount of deformation of the base material depends on the distance from the central axis, the amount of shrinkage of the resin (physical property value) and the easiness of deformation of the base material. However, the base material is partially deformed. In the case of an aspherical optical element, the thickness of the resin layer in the vicinity of the outermost periphery is often the maximum, so that the position where the deformation of the base material is maximized is also often in the vicinity of the outermost periphery of the resin layer.

Therefore, in the method described in Japanese Patent Laid-Open No. 3-184813, the base material is pulled in the direction of the mold and the central axes of the base material and the mold are deviated even though the side surface of the base material is held. The problem occurs. If the three base material holding members and the base material have exactly the same friction coefficient, the base material is pulled in the direction of the mold parallel to the central axis, so that the central axis of the base material and the central axis of the mold deviate from each other. This is because it is impossible to match the friction coefficients at the three locations in reality, but as a result, the central axis shifts. Further, the base material holding member may be deformed.

To solve this problem, a method of strengthening the holding force can be considered, but in this case, a new problem arises that the base material is deformed by the force of the holding force itself.
This phenomenon remarkably appears when the rigidity of the base material is low.

An object of the present invention is to prevent the base material from being deformed by the force itself for holding the base material and to prevent the center axes of the mold and the base material from deviating due to curing shrinkage of the resin layer. Is to provide a method for manufacturing the same.

[0008]

In order to achieve the above object, in the method for producing a composite optical element of the present invention, an energy curable resin is supplied to the surface of an optical element substrate to form a desired resin layer surface. The resin having the optical surface for pressing is pressed against the resin by making the base material relatively close to each other to form a desired resin layer between the metal mold and the base material, and then the resin is irradiated with energy. In the method for manufacturing a composite optical element in which a layer is cured and then the cured resin layer and the mold are separated, the deformation of the substrate at the position where the amount of deformation of the substrate due to curing shrinkage of the resin during energy irradiation is the largest It is characterized in that the mold and the base material are brought relatively close to each other in a direction parallel to the optical axis so as to cancel out.

[0009]

The above structure will be described in detail with reference to the accompanying drawings.

The diameter is 22 mm and the thickness is 2 as shown in FIG.
When the thickness t (0) on the central axis is 0.1 mm on the cylindrical base material 52 of mm and the distance from the central axis is x (mm), the thickness t (in the direction parallel to the central axis is x) is t (x) = 0.1
A case where the resin layer 53 of + 0.03x (0 ≦ x ≦ 10) is placed and the resin layer surface 53a is in close contact with the optical surface (the surface pressing the resin layer) 51a of the mold 51 will be described. .

The center axis of the base material is adjusted in advance by the centering member 54 so as to coincide with the center axis of the mold.
As shown in, the centering members are provided at three locations on the outer peripheral portion of the base material at equal intervals. When the resin layer is irradiated with energy in this state, the resin layer begins to harden, and at the same time the resin layer contracts. Then, a force is generated inside the resin layer in the direction of making the distance between the mold and the base material relatively close to each other, but since the mold is usually fixed so that it cannot be easily deformed, the resin shrinks due to curing shrinkage of the resin layer. The material will be pulled in the direction approaching the mold.

Here, since the amount of shrinkage of the resin is the largest outside the outermost peripheral portion of the base material, the largest product of the distance from the central axis and the amount of shrinkage is near the outermost peripheral portion of the resin layer. The greatest stress is applied to the material near the outer periphery of the base material. Therefore, the base material is most deformed near the outermost peripheral portion of the resin layer. At this time, when the mold is brought close to the base material so that the pressure with which the mold presses the resin becomes constant by using the method shown in the prior art, the deformation near the outer peripheral portion of the base material is suppressed to some extent. can do. However, the amount of deformation of the base material is the most near the outer periphery of the base material, so the base material is pulled in the direction of the mold at the position where the base material is held, and the central axes of the mold and the base material are misaligned. The problem occurs.

Therefore, in order to always cancel the maximum deformation,
Move the mold towards the substrate. Then, the base material is not pulled in the direction of the mold, and the problem that the central axes of the base material and the mold are displaced can be solved. At this time, except for the portion where the base material is deformed to the maximum, compressive stress is applied to the resin layer by bringing the mold close to the base material, but the base material and the resin layer are elastically deformed, and therefore the energy of If the mold and the resin layer are peeled off after the irradiation is completed, the compressive stress applied to the base material and the resin layer is released, so that there is no problem.

The amount of shrinkage of the resin layer at an arbitrary position is calculated by calculating the thickness of the resin layer before irradiation with energy (calculated because the optical surface of the mold and the molding surface of the substrate are known) and energy. The thickness can be easily calculated by comparing the thicknesses of the resin layers of the composite optical element separated from the mold after completion of irradiation (determined by measuring the shape of the resin layer surface).

[0015]

Embodiments of the method of manufacturing a composite optical element according to the present invention will be described below with reference to the accompanying drawings.

(Embodiment 1) First, as shown in FIG. 1, a required amount of ultraviolet curable resin 5 is discharged onto a molding surface (optical functional surface on which a resin layer is placed) of a glass substrate 2 having concave surfaces on both sides. To do.
Here, the base material 2 has a molding surface with a radius of curvature of 18 mm, and a non-molding surface (optical functional surface on which the resin layer is not mounted) has a curvature radius of 10 mm.
The outer diameter of the molding surface of the base material 2 is 0 mm, the outer diameter is 25 mm, and the width in the radial direction perpendicular to the central axis is 1.5 m.
The end face 2a of m is provided so as to have an axially symmetrical shape with respect to the central axis of the base material. Further, the base material is shown in FIG. 16 and FIG.
It is held by the method shown in FIG.

Next, as shown in FIG. 2, it has an optical surface (surface for pressing resin) 1a for forming a desired resin layer surface, the diameter of the optical surface 1a is 20 mm, and the central axis is The resin 5 is spread by lowering the mold 1 that is held in the same vertical axis as the central axis of the base material 2 and is held close to the base material 2,
The mold 1 is placed at a position where the resin 5 forms the resin layer 3 having a desired thickness.
Stop descending. Here, the thickness of the resin layer 3 on the central axis is 0.1 mm and the effective diameter D is 19 mm.
The outermost peripheral part of the above reaches the outside of the effective diameter D, and does not reach the outside of the end surface 2a of the base material 2 and the optical surface 1a of the mold 1. Also, the distance from the center axis is x
Then, the thickness t (x) of the resin layer in the direction parallel to the central axis
Is approximately 0.1 + 0.03x.

Next, ultraviolet rays are applied to the entire surface of the resin layer from below the base material 2 by means not shown to start curing of the resin layer 3. Here, assuming that the irradiation time of ultraviolet rays is 60 seconds,
The largest amount of resin shrinkage is 9m from the central axis
At the position m, the curing shrinkage amount (integrated value) of the resin in the direction parallel to the central axis at that position is 10 as shown in FIG.
10 μm in sec, 12 μm in 20 sec, 14 in 40 sec
It was experimentally determined that the thickness becomes 15 μm in 60 μsec.

Therefore, during the irradiation of energy, the mold is moved toward the substrate so as to always cancel out the curing shrinkage amount of the resin shown in FIG. Then, since the base material and the mold are relatively close to each other without causing friction between the side surface of the base material and the centering member in the outer peripheral portion of the resin layer, the center axes of the base material and the mold are not displaced. However, at this time point, the force for compressing the resin layer is generated in the portion where the shrinkage amount of the resin layer is small. Then, when the energy irradiation is completed, a contact body in which the mold 1, the base material 2 and the resin layer 3 are integrated is formed.

Next, as shown in FIG. 4, when the contact member is raised, the peeling member 4 previously provided above a part of the end surface 2a of the base material 2 and the end surface 2a of the base material 2 are brought into contact with each other. Contact.
Here, the lower surface of the peeling member 4 is formed with a flat surface 4a parallel to the end surface 2a of the base material 2. Then, the load is first concentrated on a portion of the end face 2a of the base material 2 where the flat surface 4a of the peeling member is in contact, and thereafter, the load is dispersed over the entire base material.

If the contact member is continuously raised, as shown in FIG. 5, the composite optical element 6 in which the base material 2 and the resin layer 3 are integrated from the mold 1 easily and instantly is obtained. It is peeled off. At this time, the compressive stress accumulated inside the resin layer until now is released. Here, since the completed composite optical element has no deviation between the central axes of the base material and the mold, the eccentricity accuracy is extremely good.

According to the manufacturing method of this embodiment, a composite optical element having extremely high decentering accuracy can be obtained by using the method of holding the outer peripheral portion of the base material and aligning the central axes of the base material and the mold. You can

(Embodiment 2) First, as shown in FIG. 6, a required amount of ultraviolet curable resin 5 is discharged onto the molding surface of a glass base material 12 having convex surfaces on both sides. Here, the base material 2 has a molding surface having a radius of curvature of 50 mm, a non-molding surface having a curvature radius of 30 mm, and an outer diameter of 20 mm, and the base material 2 has a side surface with a width of 2 mm and a depth of 1 mm.
The mm-shaped v-shaped groove 12a is provided so as to have an axially symmetrical shape with respect to the central axis. Further, the base material is shown in FIG. 16 and FIG.
It is held by the method shown in FIG.

Next, as shown in FIG. 7, it has an optical surface 11a for forming a desired resin layer surface, the diameter of the optical surface 11a is 18 mm, and the central axis is the central axis of the substrate 12. The same mold 11 that is held vertically movable is lowered to approach the base material 12 to spread the resin 5, and the mold 11 is stopped at the position where the resin 5 forms a resin layer 13 having a desired thickness. To do. Here, the thickness of the resin layer 13 on the central axis is 0.
12 mm, the effective diameter D is 17 mm, the outermost peripheral portion of the resin layer 13 reaches the outside of the effective diameter D, and
It has not reached the outside of the optical surface 11a of the mold 11. When the distance from the central axis is x, the thickness t (x) of the resin layer in the direction parallel to the central axis is approximately 0.12 + 0.0.
2x.

Next, ultraviolet rays are applied to the entire surface of the resin layer from below the base material 2 by means not shown to start curing of the resin layer 13. Here, when the irradiation time of ultraviolet rays is 40 seconds, the largest shrinkage amount of the resin is 8.5 m from the central axis.
At the position m, the curing shrinkage amount (integrated value) of the resin in the direction parallel to the central axis at that position is 10 as shown in FIG.
7.5 μm in sec, 9 μm in 20 sec, and 9 in 30 sec.
It was experimentally determined that the thickness becomes 7 μm and 10 μm in 40 seconds.

Therefore, during the irradiation of energy, the mold is moved toward the substrate so as to always cancel out the curing shrinkage amount of the resin shown in FIG. Then, since the base material and the mold are relatively close to each other without causing friction between the side surface of the base material and the centering member in the outer peripheral portion of the resin layer, the center axes of the base material and the mold are not displaced. However, at this time point, the force for compressing the resin layer is generated in the portion where the shrinkage amount of the resin layer is small. Then, when the energy irradiation is completed, a contact body in which the mold 11, the base material 12, and the resin layer 13 are integrated is formed.

Next, as shown in FIG. 9, the peeling member 14 is provided in advance on the outer periphery of the side surface of the base material 12, and the tip portion 14a has a shape in which the v-shaped groove 12a on the side surface of the base material is inverted. The tip end 14a of the peeling member
Is contacted with the v-shaped groove 12a on the side surface of the base material. Here, the position of the peeling member 14 is adjusted so that the tip portion 14a of the peeling member can be inserted into the v-shaped groove 12a on the side surface of the base material. Next, when the contact body is raised, the load is first concentrated on the portion of the side surface of the base material 12 where the peeling member 14 of the v-shaped groove 12a contacts, and then the load is dispersed over the entire base material.

Here, if the contact member is kept raised, as shown in FIG. 10, the composite type optical element 16 in which the base material 12 and the resin layer 13 are integrated is easily separated from the mold 11 instantly. It At this time, the compressive stress accumulated inside the resin layer until now is released. Here, since the completed composite optical element has no deviation between the central axes of the base material and the mold, the eccentricity accuracy is extremely good.

According to the manufacturing method of this embodiment, a composite optical element having extremely high decentering accuracy is obtained by using the method of holding the outer peripheral portion of the base material so that the central axes of the base material and the mold coincide with each other. You can

(Embodiment 3) First, as shown in FIG. 11, a required amount of the ultraviolet curable resin 5 is discharged onto the molding surface of a glass substrate 22 having a concave molding surface and a convex non-molding surface. here,
The base material 22 has a forming surface having a radius of curvature of 90 mm, a non-forming surface having a radius of curvature of 25 mm, and an outer diameter of 20 mm. The outermost peripheral portion of the forming surface of the base material 22 is perpendicular to the central axis in the radial direction. The end surface 22a having a width of 1 mm is provided so as to have an axially symmetrical shape with respect to the central axis of the base material. In addition, the base material is shown in FIG.
And held by the method shown in FIG.

Next, as shown in FIG. 12, an optical surface 21a for forming a desired resin layer surface is provided.
Has a diameter of 18 mm, and the central axis is the same as the central axis of the base material 22 and is vertically held so that the mold 21 is lowered and brought close to the base material 22 to spread the resin 5, and the resin 5 is desired. The lowering of the mold 21 is stopped at a position where the resin layer 23 having a thickness is formed. Here, the thickness of the resin layer 23 on the central axis is 0.05 mm and the effective diameter D is 17 mm.
The outermost peripheral portion of 3 reaches the outside of the effective diameter D, and is on the end surface 22a of the base material 22 and the optical surface 2 of the mold 21.
It has not reached the outside of 1a. Further, when the distance from the central axis is x, the thickness t of the resin layer in the direction parallel to the central axis is
(X) is approximately 0.05 + 0.025x.

Next, ultraviolet rays are applied to the entire surface of the resin layer from below the base material 22 by means not shown to start curing of the resin layer 23. Here, assuming that the irradiation time of ultraviolet rays is 50 seconds, the largest shrinkage rate of the resin is at the position where the distance from the central axis is 8.5 mm, and the curing shrinkage amount of the resin in the direction parallel to the central axis at that position. As shown in FIG. 13, the (integrated value) is 10 μm for 10 seconds, 12.5 μm for 20 seconds,
14sec in 30sec, 14.6μm in 40sec, 50se
It was experimentally determined that c was 15 μm.

Therefore, during the irradiation of energy, the mold is moved toward the substrate so as to always cancel out the curing shrinkage amount of the resin shown in FIG. Then, since the base material and the mold are relatively close to each other without causing friction between the side surface of the base material and the centering member in the outer peripheral portion of the resin layer, the center axes of the base material and the mold are not displaced. However, at this time point, the force for compressing the resin layer is generated in the portion where the shrinkage amount of the resin layer is small. Then, when the energy irradiation is completed, a contact body in which the mold 21, the base material 22, and the resin layer 23 are integrated is formed.

Next, as shown in FIG. 14, when the contact member is raised, the peeling member 24 previously provided above a part of the end surface 22a of the base material 22 and the end surface 22a of the base material 22 are brought into contact with each other. Contact. Here, the lower portion of the peeling member 24 is the base material 2
A flat surface 24a parallel to the second end surface 22a is formed.
Then, the load is first concentrated on a portion of the end surface 22a of the base material 22 where the flat surface 24a of the peeling member is in contact, and thereafter, the load is dispersed over the entire base material.

Here, if the contact body is continuously raised, FIG.
As shown in FIG.
The composite optical element 26 in which 2 and the resin layer 23 are integrated is peeled off. At this time, the compressive stress accumulated inside the resin layer until now is released. Here, since the completed composite optical element has no deviation between the central axes of the base material and the mold, the eccentricity accuracy is extremely good.

According to the manufacturing method of this embodiment, a composite optical element having extremely high decentering accuracy can be obtained by using the method of holding the outer peripheral portion of the base material so that the central axes of the base material and the mold coincide with each other. You can

[0037]

According to the manufacturing method of the present invention, even if the resin layer undergoes curing shrinkage, a composite type optical element having a high eccentricity accuracy does not occur in the center axes of the mold and the base material. It can be manufactured.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a method of manufacturing a composite optical element according to Example 1 of the present invention in the order of steps.

2A and 2B are views for explaining the method of manufacturing the composite optical element according to the first embodiment of the present invention in the order of steps.

FIG. 3 is a graph showing a relationship between an ultraviolet irradiation time and a curing shrinkage amount of a resin in Example 1.

4A to 4D are views for explaining the method of manufacturing the composite optical element according to Example 1 of the present invention in the order of steps.

5A and 5B are views for explaining the method of manufacturing the composite optical element according to the first embodiment of the present invention in the order of steps.

FIG. 6 is a diagram for explaining a manufacturing method of the composite optical element according to Example 2 of the present invention in the order of steps.

FIG. 7 is a drawing for explaining the manufacturing method of the composite optical element according to Example 2 of the present invention in the order of steps.

FIG. 8 is a graph showing a relationship between an ultraviolet irradiation time and a curing shrinkage amount of a resin in Example 2.

FIG. 9 is a drawing for explaining the manufacturing method of the composite optical element according to Example 2 of the present invention in the order of steps.

FIG. 10 is a drawing for explaining the manufacturing method of the composite optical element according to Embodiment 2 of the present invention in the order of steps.

FIG. 11 is a diagram for explaining a manufacturing method of the composite optical element according to Example 3 of the present invention in the order of steps.

FIG. 12 is a drawing for explaining the manufacturing method of the composite optical element according to Embodiment 3 of the present invention in the order of steps.

FIG. 13 is a graph showing the relationship between the ultraviolet irradiation time and the curing shrinkage amount of resin in Example 3.

FIG. 14 is a drawing for explaining the manufacturing method of the composite optical element according to Embodiment 3 of the present invention in the order of steps.

FIG. 15 is a diagram for explaining a manufacturing method of the composite optical element according to Example 3 of the present invention in the order of steps.

FIG. 16 is a front view for explaining the principle of the present invention.

FIG. 17 is a plan view for explaining the principle of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold 1a Optical surface 2 Base material 2a End surface 3 Resin layer 4 Separation member 4a Plane 5 UV curable resin 6 Composite optical element 11 Mold 11a Optical surface 12 Base material 12a V-shaped groove 13 Resin layer 14 For peeling Member 14a tip part 16 composite type optical element 21 mold 21a optical surface 22 base material 22a end face 23 resin layer 24 member for peeling 24a flat surface 26 composite type optical element 51 mold 51a optical surface 52 base material 53 resin layer 53a resin Layer surface 54 Centering member D Effective diameter

Claims (1)

[Claims] 1. A resin is provided by supplying an energy-curable resin to the surface of an optical element substrate and bringing a mold having an optical surface for forming a desired resin layer surface and the substrate relatively close to each other. Manufacture of a composite optical element in which a desired resin layer is formed between a mold and a base material by pressing and expanding, and then the resin layer is cured by irradiation of energy, and then the cured resin layer and the mold are separated. In the method, the mold and the base material are relatively brought close to each other in a direction parallel to the optical axis so as to cancel the base material deformation at the position where the base material deformation amount due to curing shrinkage of the resin during energy irradiation is the largest. And a method for manufacturing a composite optical element.