JPS5835501A - Lens made of plastics - Google Patents

Abstract

PURPOSE:To remove a ripple owing to an SiO2 surface hardening layer and to obtain good reflection preventing characteristics, by providing a reflection preventing layer made of a metallic oxide at the boundary between the SiO2 surface hardening layer and a high refactive index resin. CONSTITUTION:An SiO2 surface hardening layer 32 is provided on a high refractive index synthetic resin 30 having a larger refractive index than that of SiO2, and a reflection preventing layer having four-layered films consisting of layers 33, 34, 35 and 36 is disposed thereon. A layer 31a having 0.05lambda-0.15lambda optical film thickness of SiO2 is provided to the resin 30 side in order to remove a ripple which is generated by reflectin at the boundary between the resin 30 and the layer 32 and by which reflection preventing characterstics are deteriorated, and thereon, a layer 31b having 0.01lambda-0.15lambda optical film thickness of ZrO2, HfO2, Ti2O3, TiO2, Ta2O3, Si3N4, Yb2O3, Y2O3 and Al2O3 is stacked further.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a relatively high refractive index (refractive index of 1.58 or I, 1.61) for a synthetic resin, and has anti-reflection treatment and surface hardening treatment. This invention relates to synthetic resin lenses.

In recent years, lenses made of synthetic resin have become widely used, mainly in fields where lightness is required.

In particular, in the field of eyeglass lenses, lenses made of synthetic resin are much lighter than lenses made of inorganic glass, and are therefore more comfortable to wear, so the number of users of them has rapidly increased over the past 10 years. Currently, diethylene glycol bisallyl carbonate is the mainstream synthetic resin material for eyeglass lenses for vision correction. Although this resin has the advantage of relatively good scratch resistance and is easy to dye, it has the disadvantage that the center thickness and scorch thickness of the lens are thicker than inorganic glass lenses. Especially 1
Users complained that the negative-strength lenses were too thick. Another drawback is that they are more easily scratched than lenses made of inorganic glass.

The present invention eliminates and improves these drawbacks.

An object of the present invention is to reduce the thickness of a lens by using a resin with a relatively high refractive index as a resin for the lens.

Another object of the present invention is to use a resin that has good adhesion to the metal oxide vapor deposited film, thereby making it possible to perform surface hardening treatment and antireflection treatment using the metal oxide, thereby improving the scratch resistance of the lens. The purpose is to improve optical properties.

Another object of the present invention is to use a metal oxide, especially Sin, in order to fully bring out the effect of the antireflection treatment.

An object of the present invention is to provide an antireflection layer at the interface between the multifaceted hardened layer and the high refractive index resin to enhance the antireflection effect.

In the present invention, the synthetic resin has a relatively high refractive index and has good adhesion to a vacuum-deposited metal oxide film.

30 to 50 parts by weight of styrene, 40 to 70 parts by weight of 2.2bis(4-methchlorooxyethoxy-3,5-dibromphenyl)propane, and 110 parts by weight of an ultraviolet absorber.
A synthetic resin obtained by radical polymerization of a mixture of monomers containing 1 to 2.0 parts by weight and 1101 to 2.0 parts by weight of a light stabilizer was used. The resin according to the present invention has a refractive index of 1.58 to 1.61 in the composition range listed above.
Also. Since it is moderately cross-linked, it has relatively good machinability and chemical resistance. 2.2bis(4-methachlorooxyethoxy-5,5-dibromphenyl)7'roban is a white color at room temperature. Since it is a solid and has a limited solubility in styrene, it is difficult to increase the content beyond the above-mentioned composition 4 to increase the crosslink density. In particular, in the case of heating polymerization molding by molding using molded glass and gaskets, add 1 to 5 parts by weight of diethylene glycol bisallyl carbonate and 0.5 parts of dimethacrylate of ethylene glycol sifuricidyl ether to the above-mentioned mixed solution.
Adding 5 parts by weight to Kahe makes it easier to polymerize the lens. Further, as the polymerization initiator, a Nokuichi ester type polymerization initiator is suitable.

A 5-inch vacuum-deposited film has been widely used for the surface hardness of synthetic resin lenses, and in the present invention, it is also used to improve the scratch resistance of the lens.

A 5ins layer with a film thickness of 1 μm and 6 μm is provided on the lens surface. Since the resin according to the present invention has good adhesion with the metal oxide vapor deposited film, the scratch resistance can be easily improved by vacuum vapor depositing, for example, 5 inches.The thickness of the surface hardening layer is as follows:
It depends on the performance you are looking for.

In the case of 810 tons, a film thickness of 1 .mu.m or more is sufficient for the effect, and if the film thickness is 6 .mu.m or more, no improvement will be achieved even if the film is made thicker.

In the present invention, an antireflection film made of metal oxide or metal nitride is further provided on this 5-ins interface hardening layer. & Zr as a high refractive index material used for anti-reflection film
Os, T(fog, Ti mushroom Om, Ties,
Ta*Os.

Use YsOs, Yb50m, 81mNat or A to A.

5ins is used as the low refractive index material. In the present invention, the antireflection layer on the 810-layer surface hard layer is layer 33. of FIG. A 4-layer film consisting of layers 341, 351 and 36 is used, and the layer 33 has an optical thickness (LO7λ0 of 0.25λ·, ZrO snow, HfCh).

Times, Ties, Ta5ks, Ys
1134 is made of Os, YbOs or Sigma and has an optical thickness of 0.02λ to IIL15.
It consists of 5103 layers with λ・1 layer 35 has an optical thickness of 0.2λ
ZrOs, afo, at 0.5λ· from .

Ties, Times, Ta5ks or 5isN
The layer 56 has an optical thickness of 0.2 to 0.3 and 5 ins. It is preferable to form a sufficiently strong film with this substance by vacuum evaporation or ion blasting within the heat-resistant temperature range of the resin of the present invention (150° C. or lower).

As shown in Fig. 91, when the 5ins P surface hardening 7ii11 and the above-mentioned four-layer antireflection layer 12 are provided on the synthetic resin lens 10 of the present invention, the spectral reflection characteristics of the surface are as shown in Fig. 221. . Severe ripples occur.

It can be seen that the antireflection properties have deteriorated. This is S
The refractive index of the iO resin is 1.44 or 1.46, whereas the refractive index of the resin of the present invention is about 1.6, which is a difference of nearly 0.15, and the refractive index of the resin 10 and the resin of the present invention are approximately 1.6. This is due to the increased reflection at the interface of the hard surface layer.In the present invention, this ripple is eliminated.In order to obtain good anti-reflection properties, an anti-reflection layer is placed between the left hard surface layer of the resin. The anti-reflection layer at this interface was made of the resin of the present invention with an oil contact ratio of 1.6 and 5iot.
This is because the refractive index of the p-plane hardened layer is 1.46.

n = νρτ〒6 X 1.6 = 1.52 Since it is difficult to obtain a deposited material with a refractive index of 1.52, first,
As shown in FIG. 3, a layer 5103 with an optical thickness α05λ· or 0.15λ· is provided on the side of the first synthetic resin 30, and furthermore, h Z r O* + T(f O*
aTin's, Ties, Taboo, 5is
Optical film thickness of Nn Yb5Os, YsOs or Amu0 is 0.01λ. By adding + to $31, which has a refractive index of 1.52, a method was used to obtain a skin that functions equivalently to a b film with a refractive index of 1.52. By using this anti-reflection layer at the interface, ripples caused by the hard layer on the cloud surface can be almost eliminated, as shown in Figure 4-41.

It was designed to obtain good anti-reflection properties.

A more specific explanation will be given below based on examples.

Example: Kuchylev 5f, 3 parts by weight and 2 & 2 screws (4
- Methachlorooxyethoxy-3,5-dibromphenyl)propane, 5 &BM'Nm, 31 parts by weight of diethylene glycol bisallyl carbonate, and 0,8 parts of dimethacrylate of ethylene glycol diglycidyl ether.
parts by weight, ultraviolet absorber 2-(2'-hydroxy-5'
0.1 part by weight of -metyl-phenyl)-benzotriazole and the light stabilizer bis(2,2,6,6-tetramethyl-
A mixture of 0.1 parts by weight of 4-piperidine (4-piperidine) sepacate and monomers was polymerized using a molded glass and a gasket using a polymerization initiator, t-butyl oxyneodecanate. The mold used was one that would become a -6,00 day opter lens by casting diethylene glycol bisallyl carbonate.

An antireflection film having the film structure shown in FIG. 3 was vacuum-deposited on the lens after polymerization. The thickness and material of the multilayer are as follows. k, λ = 550 nm.

Layer Material Film thickness 51a 5ins O, 12λ・31b
Zros 0102λ・52
5ins 59m35 ZrC
h O, 12λ.

54 5ins O,056λ・S 5
ZrO Goose [125λ036 5iot
O, 25λ・The spectral reflectance characteristic of one surface of the lens of this example is shown at 41 in FIG. Ripple is almost empty.

40 is the surface reflection characteristic of the resin of this example when 1 reflection is prevented.

The characteristics of the lens of this example polymerized using the same glass type and gasket and a diethylene glycol carbonate lens (hereinafter referred to as lens A) are as follows.

Comparison Lens of the present invention Lens A refractive index
1.595 1. '50 Atsube number 52
57 Frequency -7,50-6,OO Steel wool characteristics A D/Wire brush c c/Light transmittance 9
As can be seen from the table above, the lens of this example is thinner than the conventional diethylene glycol carbonate lens, and has improved optical properties and scratch resistance. Furthermore, what are the steel wool characteristics?

This is a wire brush that evaluates the degree of scratching when the lens surface is rubbed with a load applied to No. The characteristics are the same as the steel wool test except that the test terminal was changed to a wire brush.

As described above, the lens according to the present invention has superior optical properties, durability, and appearance compared to conventional synthetic resin lenses.
Suitable for ocular cast lenses that require fusion properties and durability.

[Brief explanation of the drawing]

Figure 1 shows the film composition of the anti-reflection film of a basic synthetic resin lens, where %10 is a synthetic resin lens, 11 is 8
10 hard coat layers, 12 antireflection layers. FIG. 2 shows spectral reflectance characteristics when a synthetic resin with a refractive index of 1.60 is used as the synthetic resin shown in FIG. 1. FIG. 3 shows the film structure of the antireflection film of the lens of the example. FIG. 4 shows the antireflection properties of the antireflection film of the lens of the example. Akira 1 Yunshu construction area

Claims (1)

[Scope of Claims] 30 to 50 parts by weight of Nuzenshin and 4"0 to 170 parts by weight of 2.2bis(4-metachlorooxyethoxy-5,5-dibromphenyl)propane. 0.01 to 20 parts by weight of ultraviolet absorber and 0 parts of light stabilizer
．． On both sides of a synthetic resin lens made by radical polymerizing a mixed solution of monomers containing 01 to 20 parts by weight, a first layer, a second layer, etc. are applied sequentially from the center of the synthetic resin lens toward the atmosphere.
...It has a seven-layer antireflection film as the seventh layer, and the first layer has an optical thickness of 0.05λ to 0.15λ0 (λ0 is the design reference wavelength, and is between 400 nm and 700 nm. The second layer is made of ZrOs, H with an optical thickness of 0.01λ to 0.15λ0.
fO*, Times, Ties. Tames, Yyuki C1s, YbtOs, 5
The third layer has a film thickness of 1 μm to 6 μm and is 5 ins, and the fourth layer has an optical thickness of 0.2 μm. Roa λ. From Q15λ・ZrCh, T(
fos, Times, Tilt. It consists of TaOs, Y*Os, and YbmOs'f81sN4. The 5th Ws is 8 with an optical film thickness of 0.02λ to 015λ.
The sixth layer consists of ZrCh, Hf0z, Ti5Os with an optical thickness of 0.20λe to 0.50λ.
, Ties. The seventh layer is made of TaOs or 81sNa, and the seventh layer is 5103 or C- with an optical thickness of α20λ to 0.50λ.
A synthetic resin lens characterized by: