JP3071277B2 - Manufacturing method of lens - Google Patents

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 lens for manufacturing a lens in which a resin layer is integrally formed on the surface of a glass member.

[0002]

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

[0003] In forming the replica lens,
As shown in FIG. 4, a glass member 50 processed into a spherical shape having a curvature close to the aspherical shape is placed on a mold member 52 having a molding surface 52a having a desired aspherical shape. Surface 50a of member 50 and molding surface 52 of mold member 52
A method is adopted in which a liquid lens is filled in a space 54 defined between the lens and the liquid resin and cured to form a replica lens 55 having a desired aspherical shape.

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 just covering the effective beam diameter d1 of the glass member 50. (2) The amount is set so as to cover the entire surface (diameter d2) of the central portion of the glass member, excluding the surface of the barrel portion for positioning the completed replica lens with respect to the lens barrel or the like.

[0005]

However, in the above conventional example, when the supply amount of the resin material is set to an amount just covering the effective beam diameter d1 as in (1), the glass member 50 is not required. There is a problem that a defective product in which the outer diameter of the resin layer is less than the effective beam diameter d1 may be produced due to the variation in the processing dimensions of the above and the variation in the supply amount of the resin material. Further, when the supply amount of the resin material is set to such an amount as to cover the entire surface (diameter d2) of the glass member 50 excluding the body portion as in (2), the processing dimension of the glass member 50 is reduced. Due to the variation and the variation of the supply amount of the resin, the resin may reach the positioning portion (the body-attached portion) 50b for the lens barrel or the like, and a defective product that cannot be accurately positioned on the barrel or the like may be manufactured. There was a problem that there is. Accordingly, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a method for manufacturing a lens that can prevent defective products from occurring and can manufacture a replica lens with high yield. Is to do.

[0006]

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

[0007]

As described above, since the method for manufacturing a lens according to the present invention is constituted, the volume for supplying the resin material is reduced.
By setting the volume to be approximately intermediate between the volume covering the optical functional surface of the glass member and the volume covering the entire surface of the main body, variations in the processing dimensions of the glass member and the lens barrel and variations in the supply amount of the resin material are reduced. Even if there is some, the outer diameter of the resin layer,
Just moving between the outer diameter of the optical function surface and the inner diameter of the barrel, it will not be smaller than the outer diameter of the optical function surface or larger than the inner diameter of the barrel, improving the lens yield I do.

[0008]

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

The mold 11 is mounted on a supporting substrate 10 which is supported in a manufacturing apparatus main body (not shown) for manufacturing the lens 33 so as to extend in the horizontal direction. Specifically, a substantially cylindrical mold member 12 constituting a main part of the mold 11 is placed on the support substrate 10 with its central axis along a vertical line. A molding surface 12a for transferring a predetermined aspherical shape onto the surface of the resin layer 32 is formed on the end face. Outside the mold member 12,
A substantially cylindrical support member 14 having an inner peripheral surface fitted with the outer peripheral surface of the mold member 12 is mounted. On the upper part of the support member 14, the glass member 30 is supported in a state where 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. A support surface 14a is formed.

Here, the support surface 14a protrudes from the edge of the molding surface 12a of the mold member 12 by an amount h, as shown in the figure, and the thickness h of the resin layer 32 is defined by the amount h. The value of the protrusion amount h is
Although it depends on the amount of aspherical surface a, even at a portion where the thickness of the resin layer 32 is the thinnest, a predetermined thickness (for example,
m) It is set so as not to be thinner.

A cylindrical positioning portion 14b is formed on the outer periphery of the support surface 14a at the upper end of the support member 14 so as to protrude 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-attached portion 30b of the glass member 30 described later. Then, by fitting the outer peripheral surface of the body-attached portion 30b to the inner peripheral surface 14c, the center of the optical axis of the glass member 30 is formed on the molding surface 1c.
It is possible to exactly match the center of 2a.

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

A height determining surface 30 for abutting against the support surface 14a of the support member 14 and defining the vertical position of the glass member 30 with respect to the mold member 12 is provided on the body-attached portion 30b.
c is formed. Also, the outer peripheral surface 3 of the body-attached portion 30b
0d is the positioning portion 14b of the support member 14 as described above.
Is formed 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 positioning portions when the lens 33 is incorporated into a lens barrel or the like.

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

Next, the glass member 30 is attached to the body
b is fitted inside the positioning portion 14 b of the support member 14 and placed on the support member 14. Thus, the glass member 3
0 is placed on the support member 14, the glass member 3
0 height determining surface 30c is the supporting surface 14a of the supporting member 14.
And the outer peripheral surface 30d of the torso portion 30b
Are fitted on 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 perpendicular to the optical axis.

When the glass member 30 is placed on the support member 14, the optical function surface 30a of the glass member 30 spreads the resin material over the entire surface of the molding surface 12a. This mounting step is carefully performed so that air bubbles do not enter the resin material. Glass member 3
When the step of mounting the “0” on the support member 14 is completed, the resin material is irradiated with active energy rays to cure the resin material, thereby forming 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 curing of the resin layer 32 is completely completed,
The lens 33 is released from the mold 11, and the lens 33 is completed.

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 shape and dimensions of the glass member 30 are accurately finished to nominal dimensions. At this time, when the glass member 30 is placed on the support member 14, FIG.
As shown in (a), the optical function surface 30a of the glass member 30
The supply volume of the resin material so that the resin material just covers (the area inside the effective ray diameter d1) is V1. Further, as shown in FIG. 2B, the main body 30 of the glass member 33 is formed.
The supply volume of the resin material necessary to just cover the surface (diameter d2) of e is V2.

Under such an assumption, in the lens manufacturing method of one embodiment, the supply volume V3 of the resin material to the mold member 12 is set to V3 ≒ (V1 + V2) / 2. FIG. 2C shows the state of the resin material protruding from the optical function surface 30a at this time. By setting the supply volume of the resin material to a substantially intermediate volume between V1 and V2 in this way, even if there is an error in the shape and dimensions of the glass member 30 or a variation in the supply volume of the resin material,
The diameter d3 of the resin layer 32 is equal to the diameter d1 of the optical function surface 30a.
And the diameter d2 of the main body 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 beam diameter d1, or the diameter d3 of the resin layer 32 is larger than the diameter d2 of the main body, and the resin material adheres to the body-attached portion 30b. Can be prevented, and the yield of the lens 33 can be improved.

(Other Embodiment) FIG. 2 shows the structure of a lens and a mold for molding the lens according to another embodiment of the present invention. The lens 43 of the other embodiment is obtained by forming a resin layer 42 on the surface of a glass member 40 having a concave surface. In FIG. 1, the glass member has a concave surface and a mold member corresponding thereto is used. Except for this point, it is exactly the same as the embodiment. In FIG. 3, a flange-shaped body portion 40b is formed on the outer peripheral portion of the glass member 40 as in the embodiment. When the resin material is supplied to the molding surface of the mold member 22, the glass member 4 is supplied in the same manner as in the embodiment.
0 optical function surface 40a (the area inside the effective ray diameter d1)
V1 of the resin material that just covers the main body 40e
Volume V of resin material enough to cover the entire surface of (diameter d2)
A resin material having a substantially intermediate volume V3 is supplied to the mold member 12. Thereby, the same effect as that of the embodiment can be obtained.

The present invention can be applied to a modification or a modification of the above embodiment without departing from the gist thereof. For example, in the above-described embodiment, the case where an ultraviolet ray-curable resin is used as the active energy ray-curable resin has been described. However, an X-ray curable resin or an infrared ray-curable resin may be used.

In the above description, the resin material is supplied only to the mold member. However, 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.
It may be made to become. Further, the description has been made such that a flange-shaped body portion is formed on the glass member. However, the body portion is not limited to the flange shape, and the spherical surface shape of the optical function surface may be a shape extended in the radial direction. good.

[0022]

As described above, according to the method for manufacturing a lens of the present invention, the volume of the resin material to be supplied is defined by the volume just covering the optically functional surface of the glass member and the volume covering the entire surface of the main body. By setting the volume to a substantially intermediate volume, even if there is some variation in the processing dimensions of the glass member and the lens barrel, and there is some variation in the supply amount of the resin material, the outer diameter of the resin layer is larger than the outer diameter of the optical function surface. Just move between the inside diameters of the barrel,
It does not become smaller than the outer diameter of the optical function surface or becomes larger than the inner diameter of the body-attached portion, and the lens yield is improved.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing the extent of the resin material protruding from the optical function surface.

FIG. 3 is a diagram showing another embodiment.

FIG. 4 is a diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Support substrate 11 type | mold 12,22 type | mold member 14 support member 30,40 glass member 32,42 resin layer 33,43 lens 50 glass member 52 type member 55 replica lens

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29C 39/00-39/44 G02B 1/00-1/08 G02B 3/00-3/14

Claims (2)

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