JPH0545501A - Composite type optical element and production thereof - Google Patents

Abstract

PURPOSE:To enhance the adhesiveness between the resin layer and light transparent base material of the optical element of a composite type which is formed with the resin layer on the surface of the light transparent base material to constitute one optical element by using a UV resin into which light transmissive inorg. fillers are incorporated into the above-mentioned resin layer. CONSTITUTION:After a proper amt. of the UV resin 2 dispersed with the glass particles 2a is first supplied onto the surface of a metallic mold 1, a master mold 5 is set in this mold 1. A polished glass lens 3 is then inserted into this master mold 5 and is exactly set in the position of a level difference 5a provided in the master mold. The polished glass lens 3 is thereafter irradiated with UV light 4 from above the lens to sufficiently cure the UV resin 2 and thereafter, the master mold 5 is removed and the metallic mold 1 is parted from the contact surface with the UV resin 2, by which the desired composite tape optical element is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite optical element in which a resin layer is formed on the surface of a light-transmitting substrate to form one optical element, such as a pickup lens for a compact disc or an optical disc or a video camera. , A lens for a camera such as a still camera, and an optical lens for a laser beam printer.

[0002]

2. Description of the Related Art In recent years, with progress in measurement / evaluation technology and processing technology, mass production of aspherical lenses by a molding method has been actively carried out. One of the construction methods is a replica method in which a photopolymerizable adhesive is formed on an optical substrate (for example, JP-A-52-25651).

As shown in FIG. 3, after a proper amount of the photopolymerization adhesive 10 is supplied onto the optical material 3, the release agent 2 is applied to the transfer surface.
By inserting the mold 1 formed with the
The mold 1 is set at a desired position by the step 11b provided in the support tool 11, and the adhesive 10 is cured by irradiating light of an appropriate radiant energy from above the mold 1.

After that, the integrated mold 1 and optical material 3 are taken out from the support 11 and the optical material 3 is peeled from the mold 1, whereby the surface shape of the mold 1 is transferred to the surface of the optical material 3. It is a method of forming a photopolymerizable adhesive.

Therefore, by using glass as the optical material 3, the main optical performance is given to various kinds of optical glass, and the aspherical shape for further improving the lens performance is formed in the resin layer 10 which is easy to process. Mold optical element can be realized.

As a result, the influence on the optical performance due to the shape change depending on the temperature and humidity characteristics of the resin can be suppressed to a small extent, while the aspherical surface shape processing makes use of the characteristics of the resin having good workability.

[0007]

As described above, the composite optical element is an optimal optical element that makes the best use of the characteristics of optical glass and resin, but since the shrinkage rate of the resin during curing is large, There is a problem that the resin layer is gradually separated from the optical substrate due to the influence of humidity.

[0008]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems by means of sufficiently suppressing the shrinkage of the resin layer formed on the surface of the optical substrate during curing. That is, a means for forming a resin containing a translucent inorganic filler, in which a translucent inorganic filler having optical characteristics (refractive index and dispersion characteristics) equivalent to that of the resin layer is dispersed, is taken.

[0009]

By including a translucent inorganic filler in the resin formed on the surface of the optical substrate, the shrinkage during curing of the resin can be suppressed to a small level, which reduces the stress at the boundary between the optical substrate and the resin. It is possible to obtain stable adhesiveness without the resin peeling from the surface of the optical substrate due to the influence of temperature, humidity and the like.

[0010]

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a cross-sectional view showing a step of producing an aspherical lens by an embodiment of the method for producing a composite optical element of the present invention. 1 is a die processed into an aspherical shape, 2 is a die surface 1
An energy-curable resin in which an appropriate amount of translucent inorganic filler-2a is dispersed on a, 3 is a translucent base material, 3a is a cup treated on the adhesive surface of the translucent base material with the resin. Ring agent, 4 indicates energy-irradiation light. Reference numeral 5 has an inner diameter such that the central axes of the mold 1 and the transparent base material 3 can be coaxially positioned, and the distance between the transparent base material and the mold has a desired resin thickness. It is a barrel type having a step 5a at such a position.

In this embodiment, the mold 1 is made of stainless steel,
The transparent inorganic filler-2a has glass particles of about 10 μm,
The energy curable resin 2 is a UV curable UV resin,
The light-transmitting substrate 3 includes a glass polishing lens and a coupling agent 3.
The silane coupling agent was used for a, the UV light was used for the energy irradiation light 4, and the stainless steel material was used for the barrel die 5.

First, an appropriate amount of UV curable UV resin 2 in which glass particles 2a are dispersed is supplied to the surface of the mold 1, and then the barrel mold 5 is set in the mold 1. Next, the glass-polishing lens 3, which is a light-transmitting base material, is inserted into the barrel mold 5 and set accurately at the position of the step 5a provided in the barrel mold. After that, UV light 4 is irradiated from above the glass polishing lens 3 to sufficiently cure the UV resin 2 and then the barrel mold 5 is removed, and the mold 1 is released from the contact surface with the UV resin 2 to obtain a desired shape. A composite optical element is obtained. FIG. 2 shows a sectional view of the optical element obtained in this example. The reference numerals correspond to those in FIG.

Glass particle filler for UV resin 2
60 ° C. of the composite optical element manufactured by changing the content of 2a
As a result of the environmental test at 90% / 90%, 60 ° C. was obtained by containing 30% by volume or more of glass particle filler-2a
It was possible to obtain durability of 500 hours or more at / 90%. However, the optical characteristics of the filler-2a (refractive index, new
If the (value) is greatly deviated from the optical characteristics of the UV resin 2, reflection occurs at the boundary between the filler-2a and the UV resin 2 and the optical performance is impaired.

[0015]

INDUSTRIAL APPLICABILITY As described above, by using the present invention, the shrinkage of the UV resin at the time of curing is suppressed to be small, so that the stress at the boundary between the optical substrate and the UV resin becomes small, and the temperature, humidity, etc. Due to the effect, stable adhesiveness can be obtained without the resin peeling from the surface of the optical substrate.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a method for manufacturing a composite optical element of the present invention.

FIG. 2 is a cross-sectional view of a composite optical element manufactured according to the same example.

FIG. 3 is a sectional view showing a method of manufacturing a composite optical element by a conventional replica method.

[Explanation of symbols]

 1 Mold 2 UV Resin 2a Translucent Inorganic Filler (Glass Particle) 3 Translucent Base Material (Glass Polishing Lens) 3a Silane Coupling Agent 4 UV Light 5 Body 5a Step

Claims (6)

[Claims] 1. A composite-type optical element characterized in that a resin containing a translucent inorganic material is formed on the surface of a translucent substrate. 2. The composite optical element according to claim 1, wherein the translucent substrate is a glass polishing lens. 3. The composite optical element according to claim 1, wherein the resin containing the translucent inorganic material is an energy-irradiation curable resin. 4. The composite optical element according to claim 1, wherein the translucent inorganic material is particles of optical glass. 5. A resin having a translucent inorganic material is supplied in an appropriate amount to a mold having an optical functional surface, and then the center axis of the mold and the translucent base material are coaxially arranged and the translucent substrate is transparent. The resin is released from the mold surface after the resin is cured by positioning the light-transmissive substrate at a position where the gap between the light-sensitive substrate and the mold becomes the desired thickness of the resin layer and performing energy irradiation. By doing so, a resin layer in which the mold surface is transferred is formed on the surface of the translucent base material, and the method for producing a composite optical element. 6. The method for producing a composite optical element according to claim 5, wherein the resin-formed surface of the translucent base material is surface-treated with a coupling agent in advance and then the resin is supplied.