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Inner surface anti-reflection blacking for optical element

An optical device, black paint technology, applied in anti-reflection coatings, radiation-absorbing coatings, coatings, etc., can solve the problems of high regular reflectivity, deterioration of internal reflectance, etc., to achieve low internal reflectivity, high elapsed time Effects on storage stability

Inactive Publication Date: 2013-04-24
CANON CHEMICALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the coating proposed here improves the storage stability over time, when the coated optical device is stored over time in a high-temperature and high-humidity environment, deterioration of the reflectance of the inner surface (especially It is a phenomenon that the regular reflectance of the inner surface becomes higher)

Method used

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  • Inner surface anti-reflection blacking for optical element
  • Inner surface anti-reflection blacking for optical element
  • Inner surface anti-reflection blacking for optical element

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0160] (Preparation of anti-reflective black paint on inner surface)

[0161]The method for producing the interior antireflection black paint according to the present invention is not particularly limited, but examples thereof include wherein a base agent containing carbon black, a metal oxide, a silane coupling agent, and an active hydrogen compound is produced separately and A method in which a curing agent comprising an electron-attracting compound capable of addition reaction with an active hydrogen compound is stirred and mixed just prior to coating the optical device. A case where a polyol compound is used as the active hydrogen compound and an isocyanate compound is used as the electron-attracting compound capable of addition reaction with the active hydrogen compound is described below.

[0162] The method used to produce the main ingredient

[0163] First, a polyol compound and a metal oxide and, if necessary, together with a solvent and an additive are added to a st...

Embodiment

[0206] Hereinafter, the present invention will be described in more detail by way of examples.

[0207] In the following Examples and Comparative Examples, the following materials were used.

[0208] Metal oxide

[0209] Titanium dioxide A: surface-treated titanium dioxide "SMT-150IB" (trade name, manufactured by Tayca Corp.), average primary particle diameter: 15 nm, surface treatment: 7% by mass, degree of methanol hydrophobization: 53%, and solid content: 98 quality%

[0210] Titanium dioxide B: surface-treated titanium dioxide produced by the following Production Example 1, average primary particle diameter: 7 nm, surface treatment: 8% by mass, degree of methanol hydrophobization: 30%, and solid content: 97% by mass

[0211] Titanium dioxide C: Surface-treated titanium dioxide produced by the following Production Example 2, average primary particle diameter: 50 nm, surface treatment: 8% by mass, degree of methanol hydrophobization: 33%, and solid content: 98% by mass

...

manufacture example 1

[0220] Manufacturing example 1 (production of titanium dioxide B)

[0221] 99 parts by mass of titanium dioxide "ST-01" (trade name, manufactured by Ishihara Sangyo Kaisha, Ltd.) having an average primary particle diameter of 7 nm was dispersed in 500 parts by mass of pure water; and an aqueous ammonia solution was added to adjust the pH to 9. An aqueous solution in which 2 parts by mass of sodium silicate was dissolved was added thereto, and heated at 90° C.; a 10% sulfuric acid solution was dropped to gradually lower the pH to 2, thereby performing silica treatment on titanium dioxide.

[0222] Then, 9 parts by mass of isobutyltrimethoxysilane was added to and mixed with 100 parts by mass of silica-treated titanium dioxide under stirring so that the particles were not combined; after that, the mixture was dried in an electric furnace, and returned at temperature After reaching room temperature, it was crushed to obtain surface-treated titanium dioxide B. The surface treatme...

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Abstract

The invention relates to an inner surface anti-reflection blacking for optical element. The blacking does not have coal tar or methylene-dianiline which may arouse great environmental load and has high storage stability of coating. In addition, the optical element coated with the blacking can maintain a low inner surface refection rate under the environment of high temperature and high humidity. Compared with coating solid contents, the blacking contains 0.1-20.0 mass % carbon black, 20-70 mass% metal oxide selected from titanium dioxide, ferric oxide, ferroferric oxide, ferric hydroxide and zirconium oxide, and 0.5-10.0 mass % silane coupling agent with active hydrogen groups or electron-attractiveness groups compared with the overall blacking. The blacking comprises active hydrogen compounds and electron-attractiveness compounds, and has a dispersed grain size D90 of 50-800 nm.

Description

technical field [0001] The present invention relates to an inner surface anti-reflection black paint for optical devices, which is used to form an anti-reflection film by applying it to the periphery of optical devices such as lenses and prisms such as edges, ridges, and flanges to absorb and cause flare. ) and ghost stray light. Background technique [0002] In an optical system constructed by combining optical devices such as lenses and prisms, if light incident on the periphery of each optical device such as edges and ridges is diffusely reflected and scattered to generate stray light, ghosting and flare, and become one of the causes of image quality degradation. [0003] Therefore, in order to suppress the reduction in optical performance due to this stray light, a black paint coating film having an inner surface anti-reflection function is formed by coating black paint on the periphery of the optical device such as edges and ridges. [0004] For this black paint with ...

Claims

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Application Information

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IPC IPC(8): G02B1/11C09D5/32C09D7/12
CPCC09D1/00C09D5/006C09D7/61C09D7/63C09D7/67C09D7/68G02B1/11
Inventor 中谷直治富山崇守田奈央
Owner CANON CHEMICALS INC
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