JPH03133611A - Manufacture of optical parts - Google Patents

Abstract

PURPOSE:To manufacture easily a highly efficient nonspherical lens or a prism or thick optical parts, by a method wherein an arbitrary nonspherical optical layer with synthetic resin injected on an optical surface of spherical glass parts is formed on the optical surface of the spherical glass parts. CONSTITUTION:Prior to injection molding of optical resin 3, spherical optical glass parts to be put on a lens cavity 10, for example, a spherical convex lens 14 is produced. The spherical convex lens 14 is put on the lens cavity 10 formed in a mold 7. In this instance, an air gap is formed between a aspherical mold 13 and the surface of the lens cavity 10, in the spherical convex lens 14. When preparation of the spherical convex lens 14 is completed, molten optical resin 3 is pushed into the mold 7 from an injection molding machine 1. The molten optical resin 3 pushed into through a nozzle 5 of an end of an injection cylinder 4 is filled into the air gap formed between the nonspherical mold 13 and the surface of the lens cavity 10 from a gate 9 by passing through a sprue 8. A aspherical resin layer 15 becoming a nonspherical optical layer is formed on the spherical convex lens 14 and a nonspherical convex lens is molded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing optical components, and particularly to a method for manufacturing thick aspherical lenses, prisms, and the like.

(Prior Art) In recent years, in the field of optical components, plastic optical components have become widely used instead of optical glass components. This is because it is lighter than conventional spherical glass lenses, it is possible to mold aspherical surfaces, making it easy to make high-performance lenses, it has excellent productivity, and it is possible to supply inexpensive lenses. This is because.

(Problem to be solved by the invention) However, plastic lenses have the disadvantage that they have high thermal expansion and hygroscopicity, and are easily scratched.Furthermore, when they become thick (10 mm+), the resin shrinks greatly, making it difficult to mold. Accuracy becomes difficult to obtain.

On the other hand, optical glass is mainly processed by spherical processing using a lapping machine, and spherical processing using this lapping machine takes a very long time. The finished lens has a large number of lenses in order to eliminate various aberrations, making it an expensive lens.

As described above, plastic lenses have their own problems in terms of reliability, and glass lenses have their own problems in processability.
When manufacturing optical parts (with a diameter of 0 mm or more), it is difficult to solve the problems that each material has.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing optical components that can easily manufacture the above-described high-performance aspheric lenses and prisms, or thick optical components.

[Structure of the Invention] (Means and Effects for Solving the Problem) In order to achieve the above object, the present invention provides a method for manufacturing an optical component using optical glass and a synthetic resin. a step of manufacturing a spherical glass component, a step of injecting synthetic resin onto the optical surface of this spherical glass component,
Since the structure includes a step of forming an arbitrary aspherical optical layer made of the injected synthetic resin on the optical surface of the spherical glass component, the optical component can be manufactured by incorporating the advantages of both glass lenses and synthetic resin lenses. By manufacturing high-performance aspheric lenses, prisms, or thick optical components, it is possible to easily manufacture high-performance aspheric lenses and prisms.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a mold according to an embodiment of the present invention, FIG. 2 is a diagram showing injection molding, and FIG. 3 is a diagram showing an example of an aspherical optical component manufactured according to the present invention. .

As shown in FIG. 2, an optical synthetic resin (hereinafter referred to as optical resin) 3, such as acrylic resin, deposited in a hopper 2 of an injection molding machine 1 is sent from the hopper 2 to an injection cylinder 4, and then It is heated and melted in 4. The molten optical resin 3 is forced into the mold 7 from a nozzle 5 at one end of the injection cylinder 4 by hydraulic pressure from a hydraulic mechanism 6 .

As shown in FIG. 1, the molten optical resin 3 pushed into the mold 7 passes through the sprue 8, which is the runner of the mold 7, and from the gate 9, which is the sprue, to the lens formed in the mold 7. It enters the cavity 10 and fills the lens cavity IO. Further, the mold 7 is divided into two parts with the parting surface 11 as a boundary, and a spherical mold 12 is formed in one part, and an aspheric mold 13 is formed in the other part.

A spherical optical glass component manufactured in the previous step, for example, a spherical convex lens 14, is placed in the lens cavity IO.

The surface of the spherical convex lens 14 and the surface of the lens cavity 10 formed in the spherical mold 12 are created with the same curvature, and there is a gap between the surface of the spherical convex lens 14 and the surface of the lens cavity 10 formed in the spherical mold 12. , no voids occur. On the other hand, the lens cavity 1 formed in the aspherical mold 13
A gap is created between the surface of the lens 0 and the surface of the spherical convex lens 14. The optical resin 3 melted in the injection cylinder 4 is filled into this gap through the gate 9, and an aspherical resin layer 15 is formed on the surface of the spherical convex lens 14, thereby molding an aspherical lens.

Next, the operation of one embodiment of the present invention having the above configuration will be explained.

In the first step, prior to injection molding of the optical resin 3, a spherical optical glass component, such as a spherical convex lens 14, to be placed on the lens cavity 10 is manufactured by a normal convex lens manufacturing process. In this example, a spherical convex lens is used as an example of manufacturing an aspherical convex lens, but the spherical optical glass parts manufactured here are arbitrary, and when manufacturing an aspherical concave lens, a spherical concave lens is used, and an aspherical prism is During manufacturing, each spherical prism is produced. The spherical convex lens 14 manufactured in this way is placed on the lens cavity 10 formed in the mold 7.

At this time, the spherical convex lens 14 is in close contact with the surface of the lens cavity IO of the spherical mold 12 of the mold 7 without any gap, but there is a gap between it and the surface of the lens cavity IO of the aspheric mold 13. It will be in a formed state.

When the preparation of the spherical convex lens 14 is completed, the second process, the injection process, begins. In the injection process, optical resin 3, for example, acrylic resin, is put into the hopper 2 of the injection molding machine 1,
It is sent from the hopper 2 to the injection cylinder 4. The optical resin 3 sent to the injection cylinder 4 is heated and melted in the injection cylinder 4, and is pushed into the mold 7 from the nozzle 5 at one end of the injection cylinder 4 by the hydraulic pressure of the hydraulic mechanism 8.

When the molten optical resin 3 is pushed into the mold 7 from the injection molding machine 1, the aspherical resin layer 15 is formed in the mold 7. That is, the nozzle 5 at one end of the injection cylinder 4
The molten optical resin 3 pushed through the sprue 8 fills the gap formed between the gate 9 and the surface of the lens cavity 10 of the aspherical mold 13, and forms an aspherical optical layer on the spherical convex lens 14. An aspherical resin layer 15 is formed, and an aspherical convex lens as shown in FIG. 3(A) is molded.

Note that in the above embodiment, the mold is constructed of a spherical mold and an aspherical mold, but the mold is not limited to this, and may be constructed of an aspherical mold and an aspherical mold. In this case, if the spherical glass optical component is made into a spherical concave lens, an aspherical concave lens as shown in Fig. 3(B) will be formed, and if it is made into a spherical prism, an aspherical concave lens as shown in Fig. 3(C) will be formed. A spherical prism is formed.

Further, in the above embodiments, the optical resin is an acrylic resin, but it may be a transparent resin such as an AS resin, an amorphous polyolefin resin, a styrene resin, or a vinyl chloride resin.

Furthermore, it goes without saying that the present invention is not limited to the above embodiments and can be modified in various ways.

[Effects of the Invention] As detailed above, according to the method for manufacturing an optical component of the present invention, an aspheric optical component is manufactured by forming an aspheric optical layer on the surface of a spherical glass component by injection molding. Therefore, it becomes easy to manufacture aspherical optical components, and it is possible to provide aspherical optical components in various forms.

Particularly in the case of thick lenses, it is possible to manufacture an aspherical lens that incorporates the advantages of both glass lenses and resin lenses.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a mold according to an embodiment of the present invention, FIG. 2 is a diagram showing injection molding, and FIG. 3 is a diagram showing an example of an aspherical optical component manufactured according to the present invention. 1... Injection molding machine, 3... Optical synthetic resin (optical resin), 7... Mold,

Claims (1)

[Claims] A method for manufacturing optical components using optical glass and synthetic resin includes a step of manufacturing a spherical glass component using optical glass, a step of injecting synthetic resin onto the optical surface of the spherical glass component, and a step of injecting the injected synthetic resin. A method for manufacturing an optical component, comprising the step of forming an arbitrary aspherical optical layer made of resin on the optical surface of the spherical glass component.