JPH05318500A - Manufacture of lens - Google Patents

Abstract

PURPOSE:To prevent the generation of a defective product and manufacture a replica lens with good yield by supplying the volume of a resin material almost in the middle of the volume required for forming a resin layer just covering respectively an optical functional face and a main body surface on a molded face. CONSTITUTION:A lens 33 integrating a glass material and a resin material is formed by using a matrix material 30 composed of a main body section 30e and a body section 30b connected with in a manner of encircling the peripheral edge and molding a resin layer 32 having the given surface shape on an optical functional face 30a provided with the outer diameter d1 smaller than the outer diameter d2 of the main body section formed on the surface of the main body section 30e in the manufacturing method of the lens 33. The resin material is supplied onto a molded face 12a for transferring the given surface shape onto the surface of the resin layer 32 by the volum almost in the middle of the volume required for forming the resin layer 32 just to cover the optical functional face 30a and the volume required for forming the resin layer 32 just for covering the surface of the main body section 30e.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens manufacturing method for manufacturing a lens in which a resin layer is integrally molded on the surface of a glass member.

[0002]

2. Description of the Related Art Conventionally, there has been known a method of forming a thin film made of a resin material on a surface of a glass member to form a lens having an aspherical shape which is difficult to process with a glass material. A lens molded by such a method is generally called a replica lens.

When molding this replica lens,
As shown in FIG. 4, a glass member 50 processed into a spherical shape having a curvature close to this aspherical shape is placed on a mold member 52 having a desired aspherical molding surface 52a, and this glass is The surface 50a of the member 50 and the molding surface 52 of the mold member 52
A method of forming a replica lens 55 having a desired aspherical shape by filling a liquid resin in a space 54 defined between a and a and curing the resin is adopted.

Conventionally, the following method has been used as a method of supplying a resin material to the mold member 52 in such a molding method. (1) The supply amount is set to an amount that just covers the light beam effective diameter d1 of the glass member 50. (2) The amount is set to such an extent as to cover the entire surface (diameter d2) of the central portion of the glass member, excluding the surface of the body-attached portion for positioning the completed replica lens with respect to the lens barrel or the like.

[0005]

However, among the above-mentioned conventional examples, when the supply amount of the resin material is set to an amount that just covers the effective ray diameter d1 as in (1), the glass member 50 is used. There is a problem in that there is a possibility that a defective product in which the outer diameter of the resin layer is less than the light beam effective diameter d1 may be manufactured due to the variation in the processing dimension and the variation in the supply amount of the resin material. Further, when the amount of the resin material supplied is set to such an amount as to cover the entire surface (diameter d2) of the glass member 50 excluding the body-attached portion as in (2), the processing size of the glass member 50 is Due to variations, variations in the amount of resin supplied, etc., the resin may wrap around to the positioning portion (with barrel) 50b for the lens barrel etc., and defective products that cannot be accurately positioned on the lens barrel etc. may be manufactured. There was a problem that there was. Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a lens manufacturing method capable of preventing the generation of defective products and manufacturing a replica lens with high yield. To do.

[0006]

In order to solve the above-mentioned problems and to achieve the object, a lens manufacturing method of the present invention comprises a substantially disk-shaped main body and an outer peripheral edge of the main body. A glass member consisting of a body portion and a body portion that are connected so as to surround the base material, and a predetermined surface on the optical function surface having an outer diameter smaller than the outer diameter of the body portion formed on the surface of the body portion. In a lens manufacturing method for forming a lens in which a glass material and a resin material are integrated by forming a resin layer having a shape by molding, the resin material is
On the molding surface for transferring the predetermined surface shape to the surface of the resin layer, the volume required to form the resin layer just enough to cover the optical function surface and the surface of the body portion are just covered. It is characterized in that only a volume approximately in the middle of the volume required to form the resin layer is supplied. In the lens manufacturing method according to the present invention, the resin material is an active energy ray-curable resin.

[0007]

As described above, since the lens manufacturing method according to the present invention is configured, the volume of the resin material supplied is
By setting a volume that is approximately halfway between the volume that covers the optical function surface of the glass member and the volume that covers the entire surface of the main body,
The outer diameter of the resin layer moves between the outer diameter of the optical function surface and the inner diameter of the body even if there is some variation in the processing dimensions of the glass member and lens barrel, or variation in the amount of resin material supplied. Only then, the diameter does not become smaller than the outer diameter of the optical function surface or larger than the inner diameter of the body-attached portion, and the yield of the lens improves.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows the structure of a mold for molding a lens by the method for manufacturing a lens according to an embodiment. In FIG. 1, the lens 33
Is a so-called replica lens in which an aspherical resin layer 32 is formed on an optical function surface 30a (details will be described later) which is the surface of the glass member 30 having a convex surface. First, the mold 11 for forming the resin layer 32 on the surface of the glass member 30 will be described before describing the method for manufacturing the lens of the embodiment.

The mold 11 is placed on a supporting substrate 10 which is supported in a state of extending in a horizontal direction in a main body of a manufacturing apparatus (not shown) for manufacturing the lens 33. Specifically, on the support substrate 10, a substantially cylindrical mold member 12 that constitutes the main part of the mold 11 is placed with its central axis aligned with the vertical line. A molding surface 12a for transferring a predetermined aspherical shape to the surface of the resin layer 32 is formed on the end surface. On the outside of the mold member 12,
A substantially cylindrical support member 14 having an inner peripheral surface that fits the outer peripheral surface of the mold member 12 is mounted. For supporting the glass member 30 on the upper portion of the support member 14, the optical function surface 30a of the glass member 30 is separated from the molding surface 12a of the mold member 12 by a distance that defines the thickness of the resin layer 32. The support surface 14a is formed.

Here, the supporting surface 14a projects from the edge portion of the molding surface 12a of the mold member 12 by a protrusion amount h as shown in the figure, and the protrusion amount h defines the thickness of the resin layer 32. The value of this protrusion amount h is
Although it depends on the amount of aspherical surface of a, the resin layer 32 has a predetermined thickness (for example, 30 μm) even at the thinnest portion.
It is set so that it will not be thinner than m).

A cylindrical positioning portion 14b is formed on the outer peripheral portion of the upper end support surface 14a of the support member 14 so as to project upward from the support surface 14a. The inner peripheral surface 14c of the positioning portion 14b has an inner diameter that fits with the outer peripheral surface of the body portion 30b of the glass member 30 described later. Then, by fitting the outer peripheral surface of the body portion 30b into the inner peripheral surface 14c, the center of the optical axis of the glass member 30 is formed into the molding surface 1.
It can be exactly aligned with the center of 2a.

On the other hand, the glass member 30 is composed of a main body portion 30e (diameter d2) which is the central portion thereof, and a flange-shaped body portion 30b connected to the outer peripheral edge of the main body portion 30e. The upper and lower surfaces of the main body portion 30e are processed into a spherical shape, and a portion inside the effective light diameter d1 smaller than the outer diameter d2 of the main body portion 30e functions as an optical function portion (hereinafter, the upper and lower portions of the optical function portion will be described below). Surface is called the optical functional surface).
Then, the lens 33 is completed by forming the resin layer 32 on the optical function surface 30a below the optical function section.

The body portion 30b is in contact with the support surface 14a of the support member 14 to define the height determining surface 30 for defining the vertical position of the glass member 30 with respect to the mold member 12.
c is formed. Also, the outer peripheral surface 3 of the body portion 30b
0d is the positioning portion 14b of the support member 14 as described above.
Is processed to have an outer diameter that fits with the inner peripheral surface 14c. The height determining surface 30c and the outer peripheral surface 30d are also used as a positioning portion when the lens 33 is incorporated in a lens barrel or the like.

Next, a method of manufacturing the lens of one embodiment will be specifically described. First, in FIG. 1, the support member 1
4 with the glass member 30 removed from above, the resin material is supplied onto the molding surface 12a of the mold member 12. Here, the resin material to be supplied is an active energy ray-curable resin. Particularly, as an active energy ray-curable resin material suitable for molding the lens 33, for example, an ultraviolet-curable resin (urethane-modified acrylate and resin containing acrylate as a monomer component) is known.

Next, the glass member 30 is attached to the body portion 30 of the glass member 30.
b is fitted inside the positioning portion 14 b of the support member 14 and placed on the support member 14. In this way, the glass member 3
0 is placed on the support member 14, the glass member 3
The height determining surface 30c of 0 is the support surface 14a of the support member 14.
The outer peripheral surface 30d of the body portion 30b.
Is fitted to the inner peripheral surface 14c of the positioning portion 14b.
Therefore, the glass member 30 is accurately positioned with respect to the mold member 12 in the direction along the optical axis and the direction orthogonal to the optical axis.

When the glass member 30 is placed on the support member 14, the optically functional surface 30a of the glass member 30 spreads the resin material over the entire molding surface 12a. At this time, This placement process is performed carefully so that air bubbles do not enter the resin material. Glass member 3
When the step of placing 0 on the support member 14 is completed, the resin material is then irradiated with active energy rays to cure the resin material and form the resin layer 32. At this time, when an ultraviolet curable resin is used as the resin material, naturally, ultraviolet rays are irradiated as active energy rays. Then, after the resin layer 32 is completely cured,
The lens 33 is released from the mold 11 to complete the lens 33.

Here, in the step of supplying the resin material to the mold member 12, the supply volume of the resin material is set as follows. First, it is assumed that the glass member 30 is accurately finished to the nominal size. At this time, when the glass member 30 is placed on the support member 14, as shown in FIG.
As shown in (a), the optical function surface 30a of the glass member 30.
Let V1 be the supply volume of the resin material so that the resin material just covers (the range inside the effective ray diameter d1). Further, as shown in FIG. 2B, the body portion 30 of the glass member 33 is
The supply volume of the resin material necessary to cover the surface (diameter d2) of e is V2.

Under the above assumption, in the lens manufacturing method of the embodiment, the supply volume V3 of the resin material to the mold member 12 is set to V3≈ (V1 + V2) / 2. FIG. 2C shows a state in which the resin material protrudes from the optical function surface 30a at this time. By setting the supply volume of the resin material to a volume approximately in the middle of V1 and V2 in this way, even if there is an error in the shape and size of the glass member 30 or variations in the supply volume of the resin material
The diameter d3 of the resin layer 32 is the diameter d1 of the optical function surface 30a.
And the diameter d2 of the main body portion 30e. Therefore, the diameter d3 of the resin layer 32 is equal to the effective ray diameter d1.
And the resin layer 32 does not completely cover the effective light ray diameter d1, or the diameter d3 of the resin layer 32 is larger than the diameter d2 of the main body portion, and the resin material adheres to the trunk portion 30b. Can be prevented, and the yield of the lenses 33 can be improved.

(Other Embodiments) FIG. 2 shows a lens of another embodiment of the present invention and a structure of a mold for molding the same. The lens 43 of the other embodiment is one in which a resin layer 42 is formed on the surface of a glass member 40 having a concave surface, and in FIG. 1, the glass member is a concave surface and a mold member corresponding thereto is used. Except for this point, it is exactly the same as the one embodiment. In FIG. 3, a flange-shaped body-attached portion 40b is formed on the outer peripheral portion of the glass member 40 as in the embodiment. Then, when the resin material is supplied to the molding surface of the mold member 22, the glass member 4 is exactly the same as in the embodiment.
Optical function surface 40a of 0 (inside the effective diameter d1 of the light beam)
The volume V1 of the resin material that just covers the main body 40e
Volume V of resin material that covers the entire surface of (diameter d2)
A resin material having a volume V3 approximately in the middle of 2 is supplied to the mold member 12. As a result, the same effect as that of the first embodiment can be obtained.

The present invention can be applied to modifications and variations of the above embodiments without departing from the spirit of the invention. For example, in the above-described embodiment, the case where the ultraviolet curable resin is used as the active energy ray curable resin has been described, but an X-ray curable resin or an infrared curable resin may be used.

Although the resin material is supplied to only the mold member in the above description, the resin material is supplied to both the surface of the mold member and the surface of the glass member, and the total resin volume is V3.
May be Further, although it has been described that the flange-shaped body-attached portion is formed on the glass member, the body-attached portion is not limited to the flange-like portion, and the spherical shape of the optical function surface may be extended in the radial direction. good.

[0022]

As described above, according to the method of manufacturing a lens of the present invention, the volume of resin material supplied is such that it covers the optical functional surface of the glass member and the entire surface of the main body. By setting the volume approximately in the middle, the outer diameter of the resin layer will be smaller than the outer diameter of the optical function surface, even if there are some variations in the processing dimensions of the glass member and lens barrel or variations in the amount of resin material supplied. Just move between the inner diameter of the body part,
It does not become smaller than the outer diameter of the optical function surface or larger than the inner diameter of the body-attached portion, and the yield of the lens is improved.

[Brief description of drawings]

FIG. 1 is a diagram showing the structure of a mold for molding a lens by applying the lens manufacturing method according to an embodiment.

FIG. 2 is a diagram showing a degree of protrusion of a resin material from an optical function surface.

FIG. 3 is a diagram showing another embodiment.

FIG. 4 is a diagram showing a conventional example.

[Explanation of symbols]

 10 Support Substrate 11 Type 12, 22 Type Member 14 Support Member 30, 40 Glass Member 32, 42 Resin Layer 33, 43 Lens 50 Glass Member 52 Type Member 55 Replica Lens

Claims (2)

[Claims] 1. A glass member composed of a substantially disk-shaped main body and a body portion connected to the outer peripheral edge of the main body so as to surround the outer peripheral edge is formed on a surface of the main body as a base material. A lens in which a glass material and a resin material are integrated is formed by forming a resin layer having a predetermined surface shape by molding on an optical functional surface having an outer diameter smaller than the outer diameter of the main body. In the lens manufacturing method for, in order to form the resin material, on the molding surface for transferring the predetermined surface shape to the surface of the resin layer, just to cover the optical functional surface. A method of manufacturing a lens, which comprises supplying a volume approximately halfway between the volume required for forming a resin layer that just covers the surface of the main body and the volume required for forming a resin layer. 2. The method for manufacturing a lens according to claim 1, wherein the resin material is an active energy ray curable resin.