JPH0645482B2 - Manufacturing method of composite optical component - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a composite optical component made of glass and resin.

(Prior Art) Conventionally, for aspherical lenses, a method of directly machining glass has been mainly used while evaluating its optical effect.
It lacked stability in processing accuracy and mass productivity, and was limited to use in lenses in special fields.

Therefore, a lens material is molded as an optical resin by using a mold for mass production, but a lens formed only of the optical resin has a refractive index and a radius of curvature of a surface which change due to temperature change. There was a drawback that the focal length and the back focus went out of order.

Therefore, a so-called hybrid structure in which an optical resin material (optical plastic material) is integrally molded based on a glass base material and the glass base material and the optical resin material are joined to form a predetermined lens is considered. Being manufactured. However, there is a problem in that the glass and the resin are separated from the bonding interface due to polymerization shrinkage during the formation of the resin layer and the difference in the coefficient of thermal expansion between the glass and the resin due to the temperature change, and the glass and the optical resin are damaged.

In order to solve this problem, after applying a primer to improve the adhesiveness on the resin layer forming surface of the glass substrate, the resin layer is formed using a soft optical resin that has good followability to the difference in the coefficient of thermal expansion. And a method of forming a protective layer of a hard optical resin on the soft optical resin to form a multilayer composite lens.

(Problems of the prior art) However, in the above conventional configuration, the former method,
The stability of the resin layer is poor and it is difficult to maintain the optical performance.Because it is easily scratched, it requires careful handling.The latter method also complicates the manufacturing process, resulting in poor productivity and increased manufacturing costs. There was a problem to do.

(Object of the Invention) In view of the above circumstances, the present invention provides a method for manufacturing a composite optical component that can simplify the manufacturing process and that does not cause peeling or damage from the bonding interface even when the temperature changes. The purpose is to do.

(Means for Solving Problems) Therefore, in the method for manufacturing a composite optical component according to the present invention, a curable resin is interposed between a mold and a glass substrate having a peripheral portion that does not affect optically, A method for producing a composite optical component, comprising forming a resin layer on the surface of the glass substrate, and then releasing the mold from the mold to form a composite optical component composed of the glass substrate and the resin layer. A resin is formed by forming a pick-up surface portion on the peripheral portion of the resin layer-forming side surface of the base material, molding the resin layer in contact with the pick-up surface portion, and biting and bonding a part of the resin layer to the pick-up surface. The adhesive strength between the layer and the glass substrate is improved and the resin layer is stabilized when the temperature changes.

(Example) FIGS. 1 to 3 are explanatory views of a method for manufacturing a composite optical component according to the present invention, in which an aspherical lens in which an aspherical resin layer is formed on a glass substrate is molded.

Hereinafter, description will be given with reference to the drawings.

Reference numeral 1 is a lens substrate formed of an optical glass material, 2 is a resin layer formed of an optical resin, and 10 is a mold for an aspherical lens.

The lens base material 1 has a ring-shaped slit surface 11A in which a peripheral edge portion of the resin layer forming side surface 11 which has no optical influence is processed into a predetermined roughness by a file (first portion).
Figure).

The mold 10 has a mold surface 10A formed by molding the aspherical surface of the lens to be molded.

Then, after applying a mold release agent to the mold surface 10A of the lens mold 10, the resin layer forming side surface 11 is opposed to the mold surface 10A, and the glass substrate 1 is fixed for a predetermined distance to fix the lens mold 10. A monomer is injected into the gap with the glass substrate 1 to form a monomer layer 2A (Fig. 2). The monomer layer 2A
Is the pick-up surface portion 11 of the resin layer forming side surface 11 of the lens substrate 1.
It is set in advance so as to be a filling range in which A and A are polymerized in a predetermined range.

After forming the monomer layer 2A, the whole is heated at a predetermined temperature for a predetermined time to polymerize and cure the monomer.

When the monomer is completely polymerized and cured and then released, the aspherical lens 20 (FIG. 3), which is a composite optical component in which the aspherical resin layer 2 is formed on the glass substrate, is molded.

As the resin material, a resin having a high light transmittance and a low curing shrinkage property is desirable, and an epoxy resin, a polyester,
Styrene acrylonitrile is a good choice.

In the aspherical lens 20 formed in this manner, the resin adheres to and bites into the pick-up surface portion 11A of the resin layer forming side surface 11 of the glass substrate 1, and the entire resin layer 2 is firmly bonded to the glass substrate 1. It is a thing.

FIG. 5 shows the results of a thermal cycle test of the aspherical lens 20 molded by the above method, and comparison with a lens molded under the same conditions by the conventional method.

A in the figure is molded by the method for manufacturing a composite optical component according to the present invention, and the resin monomer is an epoxy resin (STYCAS manufactured by Emerson and Cumming Co., Ltd.).
T 1269A), and the resin layer 2A is formed on the peripheral surface of the resin layer-forming side surface 11 of the glass base material 1 around the entire periphery thereof.
It was made to contact all over A and heated at 80 ° C. for 10 hours to polymerize and cure.

B is a comparative example by the conventional manufacturing method, in which the surface portion 11A of the glass substrate 1 is not formed on the peripheral edge portion of the resin layer forming side surface 11, the resin monomer and the heating conditions are the same as those of A. is there.

The same release agent was used for both.

In the heat cycle test I, the test conditions were: + 5 ° C. (low temperature) for 30 minutes, + 23 ° C. ± 2 ° C. (room temperature) for 10 minutes, and + 60 ° C. (high temperature) for 30 minutes.

In the heat cycle test II, -40 ° C (low temperature) for 30 minutes, + 23 ° C ± 2 ° C (room temperature)
5 cycles without rest for 10 minutes at + 60 ° C for 30 minutes. Is.

As a result, in the thermal cycle test II, peeling and cracking of the joint surface occurred in Comparative Example B, but no defects such as peeling and cracking were observed in A by the manufacturing method according to the present invention. It was

At a general practical level, it is a necessary condition that no defects occur under the conditions equivalent to the heat cycle test II, and it is difficult to put into practical use in Comparative Example B by the conventional molding method, but it is molded by the method of the present invention. It was concluded that A was sufficiently durable for practical use.

In addition, in the above-mentioned embodiment, the work surface forming of the pick-up surface portion 11A is performed by a file, but it is needless to say that the work forming may be carried out by any other method such as sandblasting.

(Effect of the Invention) According to the method for producing a composite optical component of the present invention, since the resin layer is contacted with the pick-up surface portion formed on the side surface of the glass substrate on which the resin layer is formed, the pick-up surface portion is formed. The resin invades and is firmly bonded to the composite optical component without causing defects such as peeling and cracking due to temperature change.

Further, since the resin layer is a single layer, the manufacturing process can be simplified and the manufacturing cost can be reduced.

Furthermore, the resin material forming the resin layer is not limited to a soft material, and a material excellent in stability, weather resistance, scratch resistance, etc. can be appropriately used, which is extremely effective in terms of processability. Without that, the range of lens design is widened.

[Brief description of drawings]

FIG. 1 is a perspective view of a glass substrate in a method for manufacturing a composite optical component according to the present invention, FIG. 2 is an explanatory view of the manufacturing method, FIG. 3 is a sectional view of the composite optical component, and FIG. It is a table which shows the result of a cycle test. DESCRIPTION OF SYMBOLS 1 ... Glass base material, 2 ... Resin layer 10 ... Mold 11 ... Resin layer formation side surface 11A ... Scratch surface part 20 ... Aspherical lens (composite optical component)

Claims (1)

[Claims] 1. A curable resin is interposed between a glass substrate having a peripheral portion which does not affect optically and a mold to form a resin layer on the surface of the glass substrate, and then the mold is separated. In a method of manufacturing a composite optical component that molds a composite optical component composed of a glass substrate and a resin layer by molding, forming a pick-up surface portion on the peripheral portion of the resin layer forming side surface of the glass substrate, A method for manufacturing a composite optical component, comprising molding the resin layer by bringing the resin layer into contact with the picked surface portion.