JPH08244128A - Manufacture of resin bonded type aspherical lens - Google Patents

Abstract

PURPOSE: To produce a resin bonded type aspherical lens always having stable optical characteristics. CONSTITUTION: After a predetermined amt. of an ultraviolet curable resin soln. 2a is dripped on the central part of the surface (c) of a horizontally placed spherical glass lens 1, the spherical glass lens 1 is reversed to be placed on the upper surface of a seal mold 5. Thereafter, the spherical glass lens 1 is aligned by an aligning mechanism 6 so as to form a resin layer to a predetermined region and the seal mold 5 is pushed down so that the gap G between the surface (c) of the spherical glass lens 1 and the surface A of a mold 3 becomes equal to the thickness plan value of the resin layer. The ultraviolet curable resin soln. 2a interposed between the spherical glass lens 1 and the mold 3 is irradiated with ultraviolet rays 4 to be cured. The perfectly cured ultraviolet curable resin soln. 2a is peeled from the mold 3.

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 an aspherical lens in which a resin layer having an aspherical shape is formed on the surface of a spherical glass lens as a base material.

[0002]

2. Description of the Related Art Aspherical lenses are often used in various optical products because they have excellent performance that cannot be obtained by spherical lenses. Conventionally, glass, resin or the like has been used as a material for such an aspherical lens.

However, when manufacturing an aspherical lens using glass as a raw material, high-precision grinding is required, and since it takes time and labor to manufacture one piece, it is not suitable for mass production, and thus the production efficiency is low. There was a problem. And such a thing was a cause of high cost. In addition to this, there are cases where the glass is manufactured by the direct pressing method, but in this case, there is a problem that the type and size of the glass used are limited.

On the other hand, when an aspherical lens is manufactured using resin as a material, there is an advantage that it can be manufactured at a relatively low cost because mass production using a mold is possible. There is also an advantage that a lightweight aspherical lens can be manufactured. However, since the aspherical lens made of such a resin material has unstable optical characteristics (refractive index temperature change, etc.), it is not suitable for applications requiring precision.

As a conventional technique for solving such a problem, Japanese Patent Laid-Open No. 60-5654 as shown in FIGS.
A composite optical member described in Japanese Patent No. 4 is known. This is an aspherical lens by forming a resin layer 2 having an aspherical shape on the surface of a spherical glass lens 1 serving as a base material to have a thin thickness of, for example, about 5 to 100 μm.
Hereinafter, a conventional method of manufacturing such a composite type optical member will be described with reference to FIG. 7 by taking as an example a case where a radiation curable resin liquid is used as the energy irradiation curable resin.

First, as shown in FIG. 7A, a mold 3 having a desired aspherical surface a is inserted into the seal mold 5. Then, a predetermined amount of the radiation curable resin liquid 2a is dropped on the center of the mold 3. Here, the seal die 5 has an inner diameter substantially equal to the outer diameter of the spherical glass lens 1.

Next, as shown in FIG. 7B, the spherical glass lens 1 is inserted into the cylindrical seal mold 5 and is stabilized on the mold 3. After that, the spherical glass lens 1 and the mold are made so that the thickness F of the spherical glass lens 1 and the radiation curable resin liquid at a predetermined position F ′ becomes a predetermined thickness (design value of the aspherical lens). Bring 3 together. In particular,
The spherical glass lens 1 is pushed down by a jig (not shown) on a cylinder so that the thickness F becomes a predetermined thickness. Then, the energy irradiation means 4 irradiates the radiation 4a to cure the radiation curable resin liquid interposed between the spherical glass lens 1 and the mold 3.

Finally, when the radiation curable resin liquid 2a is sufficiently cured, the interface between the radiation curable resin liquid 2a and the mold 3 is peeled off by a predetermined method (not shown). Then, as shown in FIGS. 5 and 6, the resin layer 2 having a desired spherical shape is formed on the surface c of the spherical glass lens 1.

With such a manufacturing method, an aspherical lens having a desired surface shape can be manufactured. Further, since the spherical glass lens 1 as the base material can be obtained at a relatively low cost, the aspherical lens can be manufactured at a relatively low cost. (Hereinafter, such a lens is referred to as a resin-bonded aspherical lens.)

[0010]

When the resin-bonded aspherical lens is manufactured by the above conventional manufacturing method, there is a problem that the optical characteristics of the resin-bonded aspherical lens vary. And, such a problem has been a cause of an increase in the defective product manufacturing rate.

Therefore, it is an object of the present invention to provide a method for producing a resin-bonded aspherical lens which always has stable optical characteristics.

[0012]

To solve the above problems, the present invention provides a method for producing a resin-bonded aspherical lens, which comprises forming a resin layer having a predetermined aspherical shape on the surface of a glass lens as a base material. Then, a predetermined amount of energy irradiation curable resin is attached to the surface of the glass lens forming the resin layer, and the surface of the glass lens forming the resin layer and the mold surface of the mold are faced to each other. The mold and the glass lens are brought close to each other so that the mold surface of the mold is at a predetermined position with respect to the surface of the glass lens on which the resin layer is formed, and one surface of the glass lens and Provided is a method for producing a resin-bonded aspherical lens, which comprises irradiating an energy-irradiation-curable resin interposed between a mold surface of a mold and the resin to cure the energy-irradiation-curable resin.

[0013]

According to the method of manufacturing a resin-bonded aspherical lens according to the present invention, a predetermined amount of the energy irradiation curable resin is attached to the surface of the glass lens on which the resin layer is formed, and the resin layer of the glass lens is formed. In a state where the surface to be formed and the mold surface of the mold are opposed to each other, the mold surface of the mold is located at a predetermined position with respect to the surface of the glass lens on which the resin layer is formed. Close to the glass lens,
Energy irradiation is performed on the energy irradiation curable resin interposed between one surface of the glass lens and the mold surface of the mold, and the energy irradiation curable resin is cured to form the glass lens serving as the base material. A resin layer having a predetermined aspherical shape is formed on the surface of the.

By thus determining the thickness of the resin layer formed on the surface of the glass lens and the surface of the mold by the relative position between the surface of the glass lens and the surface of the mold, the shape of the glass lens as the base material in the thickness direction. The resin layer having a predetermined thickness can be always formed without being affected by the difference. Therefore, it is possible to always manufacture a resin-bonded aspherical lens having stable optical characteristics.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In order to always manufacture a resin-bonded aspherical lens having stable optical characteristics, it is clarified why the optical characteristics of the resin-bonded aspherical lens manufactured by the conventional manufacturing method vary. Need to First, the cause will be described with reference to FIG. In this example, a radiation curable resin, which is an energy irradiation curable resin, is used.

In general, the shape of the spherical glass lens 1 as a base material includes an error generated during processing, and in particular, the thickness of the spherical glass lens 1 at F'in the figure differs depending on the individual spherical glass lens 1. Often. Therefore, as in the above-described conventional manufacturing method, the resin layer 2 is formed so that the thickness F of the spherical glass lens 1 and the radiation curable resin liquid becomes a predetermined thickness (design value of the resin-bonded aspherical lens). If formed, the thickness of the resin layer 2 may not always meet the design value due to the influence of the thickness error of the spherical glass lens 1. The deterioration in the performance of the resin-bonded aspherical lens is caused by such an error in the thickness of the resin layer 2. Therefore, variations in the thickness of the resin layer 2 cause variations in the optical characteristics of the resin-bonded aspherical lens.

Next, a spherical glass lens used as a base material in the method of manufacturing a resin-bonded aspherical lens according to this embodiment will be described with reference to FIG.

In FIG. 1, 1 is a spherical glass lens used as a base material, and 2 is a resin layer formed by a manufacturing method (described later) according to this embodiment.

As shown in FIG. 1, the spherical glass lens 1 according to the present embodiment has a ring-shaped contact area 1a at the outer edge thereof. The contact area 1a is an area for the seal die 5 to support the spherical glass lens 1 in the manufacturing process described later. Therefore, it is desirable to determine the width of the contact area 1a so that the contact area 1a has an appropriate area. For example, if the outer diameter of the spherical glass lens 1 is φ15 to φ60 mm and the center thickness is 1 to 10 mm, the contact area 1a
The width may be 0.3 to 5 mm.

Now, such a spherical glass lens 1 is
If the contact area 1a is included in the outer diameter when designing,
It can be manufactured by a manufacturing method similar to that of a normal spherical glass lens. Therefore, it can be manufactured relatively easily and inexpensively, and as a result, the manufacturing cost of the resin-bonded aspherical lens according to the present embodiment can be reduced. If the surface c of the spherical glass lens 1 is previously subjected to silane coupling treatment, the adhesive strength between the surface c of the spherical glass lens 1 and the resin layer 2 can be improved. In this example, a product of KBM503 Shin-Etsu Chemical Co., Ltd. diluted in a 2 wt% ethanol solution was used as a silane coupling agent, and the surface c of the spherical glass lens 1 was subjected to silane coupling treatment. did.

By the way, the surface shape of the glass lens as the base material does not necessarily have to be a spherical surface, and may be an aspherical surface. Since the aspherical glass lens used as the base material in this embodiment does not require high processing accuracy, it can be relatively easily and inexpensively manufactured by a manufacturing method using a grinding machine that is generally performed. Therefore, even if the aspherical glass lens is used as the base material, the resin-bonded aspherical lens can be manufactured at a relatively low cost. When the aspherical glass lens is used as the base material as described above, it is desirable to use one having an aspherical surface shape similar to the design shape of the resin-bonded aspherical lens.

A method for producing a resin-bonded aspherical lens having stable optical characteristics by using such a spherical glass lens 1 as a base material will be described below with reference to FIG.
Will be described with reference to. However, the mold 3 according to the present embodiment is made of a stainless alloy and has a desired aspherical surface A as in FIG. 7. Then, the surface A is nickel-plated.

First, as shown in FIG. 2 (a), the spherical glass lens 1 is placed so that its principal plane is horizontal, and its surface c
A predetermined amount of ultraviolet curable resin liquid 2a (for example,
Drop the product name Aronix UV3700, Aronix 3033HV (made by Toagosei Kagaku Co., Ltd.). Although the ultraviolet curable resin is used in this embodiment, it is not always necessary to use this, and it is possible to use other thermosetting resins such as epoxy resin, unsaturated polyester, polyurethane, and modified acrylic resin. I do not care. However, it is desirable to use one having an appropriate viscosity for the convenience of the following work. Further, unless special optical characteristics are required, the refractive index at the time of curing (refractive index of the resin layer 2 described later) is
It is desirable to use a resin liquid having a refractive index that matches that of the spherical glass lens 1.

Next, as shown in FIG. 2B, the spherical glass lens 1 is reversed from the state of FIG. 2A and then placed on the upper surface of the seal mold 5. Then, the spherical glass lens 1
It is supported on the upper surface of the seal mold 5 in the contact area 1a shown in FIG. Since the ultraviolet curable resin liquid 2a having an appropriate viscosity is used as described above, even if the spherical glass lens 1 is inverted, the ultraviolet curable resin liquid 2a is used.
Does not hang down from the surface of the spherical glass lens 1, but it is desirable that the work at this time be performed quickly. However, at this time, the height of the upper surface of the sealing mold 5 needs to be adjusted in advance so that the ultraviolet curable resin liquid 2a attached to the surface of the spherical glass lens 1 does not come into contact with the surface A of the mold 3. .

Then, the alignment mechanism 6 aligns the spherical glass lens 1 so that the resin layer 2 is formed in a predetermined region on the surface c of the spherical glass lens 1.
The position adjusting mechanism 6 grasps three points on the circumference of the spherical glass lens 1 like a three-jaw chuck and performs the position adjustment of the spherical glass lens 1. The details of the alignment mechanism 6 will be described later.

Next, as shown in FIG. 2C, the surface c of the spherical glass lens 1 (the surface on which the resin layer 2 is formed) and the gold at a predetermined position G ′ on the surface c of the spherical glass lens 1. Type 3
The distance G from the surface A of the spherical glass lens 1 is equal to the designed value of the thickness of the resin layer 2, that is, the surface c of the spherical glass lens 1.
With reference to, the seal die 5 is pushed down so that the resin layer 2 having a desired thickness is formed on the surface. Specifically, the distance between the height of the upper surface of the seal mold 5 on which the spherical glass lens 1 is placed and the height of the predetermined position D on the surface A of the mold 3 is
The seal die 5 is pushed down so that the thickness of the resin layer 2 becomes equal to the designed value. In this way, by gradually bringing the ultraviolet curable resin liquid 2a hanging from the surface of the spherical glass lens 1 into contact with the surface A of the mold 3, it is possible to prevent bubbles from entering the resin layer 2.

The thickness of the resin layer 2 is not particularly limited, but is about 5 to 100 μm, particularly 10 to 6 μm.
It is desirable that the thickness is 0 μm.

Thereafter, the energy irradiating means 4 irradiates the ultraviolet ray 4a to cure the ultraviolet curable resin liquid 2a interposed between the spherical glass lens 1 and the mold 3. Here, in this embodiment, the ultraviolet curable resin liquid 2a was cured by irradiating the ultraviolet ray 4a, but the ultraviolet ray 4a does not necessarily have to be the ultraviolet ray 4a. , Other radiation such as α-rays may be applied.

Finally, when the ultraviolet curable resin liquid 2a is sufficiently cured, the interface between the radiation curable resin liquid 2a and the mold 3 is peeled off by a predetermined method (not shown). Then, as shown in FIG. 1, a predetermined region of the surface c of the spherical glass lens 1,
That is, the resin layer 2 having a desired spherical shape is formed in the area inside the contact area 1a. As a result, as shown in FIGS. 1 and 3, the contact region 1a where the resin layer 2 is not formed remains on the outer ring of the resin-bonded aspherical lens, but normally, the resin-bonded aspherical lens is used. It does not cause any problems. For example, if the resin-bonded aspherical lens is held in the contact area 1a by a lens mount having an appropriate effective diameter, no problem will occur during use.

According to such a manufacturing method, unlike the conventional manufacturing method, the resin layer 2 having a predetermined thickness is always provided without being affected by the shape error in the thickness direction of the glass lens as the base material. Can be formed. Therefore, it is possible to always manufacture a resin-bonded aspherical lens having stable optical characteristics. The case where a convex lens is used as the spherical glass lens 1 serving as the base material has been described above as an example, but a concave lens can be used as the base material by selecting an appropriate mold 3.

Here, as described above, the details of the alignment mechanism 6 of FIG. 2 will be described.

FIG. 4 is a front view of the alignment mechanism 6 of FIG. Here, it is assumed that the spherical glass lens 1 of FIG. 2 is held by the lens fixing member 16 and is horizontally placed on the upper surface of the main body 12.

In FIG. 4, one tip of the lever 7 is
The lever 7 is connected to an actuator such as an air cylinder so as to move in the direction of arrow a with a constant stroke (not shown). A load in a predetermined direction is applied to the handle 9 by elasticity of the spring 10, but movement in the load direction is restricted by a pin 8 fixed to the other tip of the lever 7. The grip 9 is fixed to the cylinder 11 so that the cylinder 11 rotates in response to the movement of the lever 7. However, the rotation angle of the cylinder 9 is limited to a predetermined range by the relief groove provided in the main body 12. A lever 13 is rotatably attached to the main body 12 by a stepped shaft 14 so as to rotate at an angle of 120 °. Then, according to the rotation of the cylinder 11, the lever 13 moves to the stepped shaft 14
Rotate around. In detail, in accordance with the rotation of the cylinder 11, the pin 15 fixed to the cylinder 11 moves inside the elongated hole provided in the lever 13 and applies a load in a predetermined direction to the left side surface of the elongated hole. Then, the levers 13 at the three positions respectively move the lens fixing members 16 fixed at the ends toward the center b of the cylinder 9 while rotating around the stepped shafts 14, respectively.

With this structure, the lens fixing member 1
The spherical glass lens 1 of FIG. 2 gripped by 6 can be aligned.

This is the end of the description of the embodiment according to the present embodiment.

[0037]

According to the method of manufacturing a resin-bonded aspherical lens according to the present invention, it is possible to always manufacture a resin-bonded aspherical lens having stable optical characteristics.

[Brief description of drawings]

FIG. 1 is a sectional view of a resin-bonded aspherical lens according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a method of manufacturing a resin-bonded aspherical lens according to an example of the present invention.

3 is a partially enlarged view of the resin-bonded aspherical lens of FIG.

FIG. 4 is a diagram illustrating the alignment mechanism 6 of FIG.

FIG. 5 is a cross-sectional view of a conventional resin-bonded aspherical lens.

FIG. 6 is a sectional view of a conventional resin-bonded aspherical lens.

FIG. 7 is an explanatory diagram illustrating a conventional manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Spherical glass lens 1a ... Contact area 2 ... Resin layer 2a ... Radiation (ultraviolet) curable resin liquid 3 ... Mold 4 ... Energy irradiation means 4a ... Radiation (ultraviolet) 5 ... Seal mold lens 6 ... Positioning mechanism

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Claims (5)

[Claims] 1. A method of manufacturing a resin-bonded aspherical lens, comprising forming a resin layer having a predetermined aspherical shape on the surface of a glass lens as a base material, the method comprising: A predetermined amount of energy irradiation-curable resin is attached, and the mold surface of the mold and the resin layer of the glass lens are opposed to each other with the surface of the glass lens forming the resin layer and the mold surface of the mold facing each other. The mold and the glass lens are brought close to each other such that the distance between the mold and the surface of the mold is a predetermined distance, and the surface of the mold for forming the resin layer of the glass lens and the mold surface of the mold are interposed. A method for producing a resin-bonded aspherical lens, which comprises irradiating the energy radiation curable resin with energy to cure the energy radiation curable resin. 2. The method of manufacturing a resin-bonded aspherical lens according to claim 1, further comprising a contact surface that is in contact with a region of the glass lens on which the resin layer is not formed, the region not having the resin layer formed thereon, A holding base for holding the glass lens in a state where the surface of the glass lens on which the resin layer is formed and the mold surface of the mold are faced to each other, the holding base having a contact surface of the holding base is the mold The resin layer of the glass lens held by the mold surface and the holding table is formed by moving the mold surface relative to the mold so as to be positioned at a predetermined height with respect to the mold surface. A method for manufacturing a resin-bonded aspherical lens, characterized in that the mold and the glass lens are brought close to each other such that the distance between the surface and the surface of the lens is a predetermined distance. 3. A resin-bonding type aspherical lens manufacturing apparatus for forming a resin layer having a predetermined aspherical surface shape on the surface of a glass lens as a base material, which comprises a metal having a predetermined aspherical surface shape. A mold and a surface of the glass lens on which the resin layer is formed, a contact surface in contact with a region where the resin layer is not formed, and the surface of the glass lens on which the resin layer is formed and the mold surface of the mold. In a state of facing each other, while holding the glass lens to which the energy-irradiation-curable resin is attached, the contact surface is opposed to the mold so that the contact surface is located at a predetermined height with respect to the mold surface. And a contact surface of the holding table that is moved at a predetermined height with respect to the mold surface of the mold at a predetermined height, the mold surface of the mold and the resin layer of the glass lens are formed. Energy-curable resin between the surface and Apparatus for manufacturing a resin bonding type aspherical lenses, characterized in that it comprises an energy irradiation means for performing ghee irradiation. 4. The apparatus for manufacturing a resin-bonded aspherical lens according to claim 3, wherein the mold has a cylindrical shape, and the holding table is provided in a height direction of the cylindrical shape of the mold. Having a cylindrical shape movably extrapolated to the mold, the contact surface is the cylindrical end surface of the holding table at a position higher than the mold surface of the mold, the energy irradiation means is In the state where the end surface of the holding table is located at a predetermined height with respect to the mold surface of the mold,
Manufacture of a resin-bonded aspherical lens, comprising: energy irradiation means for irradiating energy irradiation curable resin with energy between the mold surface of the mold and the surface of the glass lens forming the resin layer. apparatus. 5. A glass lens having a resin layer formed on the surface thereof by a resin-bonding-type aspherical lens manufacturing apparatus for forming a resin layer having a predetermined aspherical shape on the surface of a glass lens held at a predetermined position. A region where the resin layer is not formed on the outer edge of the surface on which the resin layer is formed, and when the resin layer is formed on the surface, it is held at a predetermined position of the manufacturing apparatus for the resin-bonded aspherical lens. A glass lens having a region.