JPS62186202A - Antireflection film for plastic optical parts - Google Patents

Abstract

PURPOSE:To obtain an antireflection film having improved adhesive power and high mass productivity by forming >=1 layers of thin metallic film layers on the surface of plastic optical parts and forming >=1 layers of thin dielectric film layers thereon. CONSTITUTION:This antireflection film is constituted by forming >=1 layers of the thin metallic film layers on the surface of the plastic optical parts and forming >=1 layers of the thin dielectric film layers on the thin metallic film layers. The thin metallic film layers consist of copper, aluminum, nickel, gold, chromium, palladium or tin alone or the alloy thereof and the thin dielectric film layers are preferably formed of silicon oxide or magnesium fluoride alone or the mixed material composed thereof. The antireflection film for the plastic optical parts having the improved adhesive power and high mass productivity is thus obtd.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to video cameras, still cameras, optical components for original pickups, and professional televisions.

This invention relates to antireflection coatings for plastic optical parts used in copying machines and the like.

[Prior art and its problems]

With the recent advent of ultra-precision mold processing machines and improvements in injection molding technology, plastic parts have come to be used instead of glass parts, which have traditionally been the mainstream for optical parts. As with glass parts, a thin film is applied to prevent surface reflections. However, plastic optics also have some drawbacks. In other words, the thermal deformation temperature is lower than that of inorganic glass. The moisture content is high, and a phenomenon in which moisture floats out on the surface of plastic optical components occurs during film formation using the vacuum evaporation method.In addition, a large amount of gas, mainly low molecular weight carbon compounds, is emitted.Plastic optical components and thin film materials There is a large difference in the coefficient of linear expansion, which affects the reduction in adhesion.

In order to solve the above problems, there have been proposals to improve adhesion by using RIF ion blating method and partial sputtering method together during vacuum deposition. However, although it was confirmed that initial adhesion was improved as an effect, a tendency for extreme deterioration in long-term reliability was observed.

[Purpose of the invention]

An object of the present invention is to provide an antireflection coating for plastic optical components that has improved adhesion and is highly mass-producible.

[Contents and means of invention]

The antireflection film for a plastic optical component of the present invention is formed by forming a metal thin film layer of at least 1 # or more on the surface of the plastic optical component, and forming the antireflection film on the surface of the plastic optical component. By forming at least one dielectric thin film layer on the V film layer, it is possible to provide an antireflection film for plastic optical components that has improved adhesion and is highly mass-producible.

〔Example〕

The present invention will be explained below based on Examples.

FIG. 1 shows a conventional configuration. Magnesium fluoride was deposited on an acrylic injection molded product to a thickness of about 1200^ by vacuum evaporation.

FIG. 2 shows a configuration showing an embodiment according to the present invention.

Chromium thickness 25X, magnesium fluoride thickness 950
It is X. Neither the metal thin film material nor the dielectric thin film material is limited to this example, and similar effects were observed with the materials described in the claims. The specific configuration is shown in Table 1.

The tests carried out to compare the physical properties with conventional examples were: (1) Humidity test (temperature 40°C, relative humidity 90%, left for 1000 hours) (2) Heat resistance test (temperature 80°C, left for 1000 hours) (
8) Thermal shock test (low temperature range -20℃, high temperature range +7
The experiments were carried out at 0°C (alternately left for 1 hour each).

The long-term reliability results are shown in Table 2. From this, it became clear that the effects of the present invention were sufficiently effective. In the examples of the present invention, injection-molded acrylic resin was used, but other materials include 0R-59 (dithylene glycol bis-acrylic carbonate), + Yasting-molded acrylic resin, l-recarbonate resin, and polystyrene. A similar effect is shown on synthetic resins such as

〔Effect of the invention〕

As described above, the antireflection coating for plastic optical components of the present invention eliminates the conventional drawbacks and improves the ffi
It has an anti-reflection coating with high productivity and improved adhesion. This is a highly practical invention in the industrial field.

Table 1 Table 2

[Brief explanation of drawings]

FIG. 1 is a diagram showing the structure of an antireflection film of a conventional plastic optical component. FIG. 2 is a diagram showing the structure of the antireflection film of the plastic optical component of the present invention. 1...Plastic optical parts 2...Anti-reflection coating made of magnesium fluoride 3.
...Plastic optical component 4...Metal thin film made of chromium5...Dielectric N film made of magnesium fluoride
Applicant: Seiko Epson Corporation Figure 2

Claims (4)

[Claims] (1) Reflection of a plastic optical component characterized in that at least one metal thin film layer is formed on the surface of the plastic optical component, and at least one dielectric thin film layer is formed on the metal thin film layer. Prevention membrane. (2) The metal thin film layer is made of copper (Cu), aluminum (Al
), nickel (Ni), gold (Au), chromium (Cr),
The antireflection coating for plastic optical components according to claim 1, characterized in that it is made of palladium (Pd), tin (Su) alone, or an alloy thereof. (3) The antireflection coating for the plastic optical component according to claim 1, wherein the dielectric thin film layer is made of silicon oxide (SiO_2), magnesium fluoride (MgF_2) alone, or a mixture thereof. . (4) Reflection of the plastic optical component according to claim 1, characterized in that the metal thin film layer and the dielectric thin film layer are formed on the plastic optical component by heating and keeping the plastic optical component within 50°C to 100°C. Prevention membrane.