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Optical transparent member and optical system using the same

An optically transparent and optical system technology, applied in the field of optical systems, can solve the problems of high capital expenditure, insufficient anti-reflection performance, low throughput, etc., to achieve improved low-reflection properties, maintain anti-reflection performance, and good anti-reflection effect of effect

Inactive Publication Date: 2006-09-20
CANON KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the technique using fine particles, it is difficult to control the inclination and height of the fine periodic structure, and if the height for obtaining a sufficient anti-reflection effect is to be obtained, the inclination increases to cause scattering, and conversely, the light transmittance decreases
[0007] The method of forming a fine pattern by fine processing equipment has such disadvantages that not only does this patterning method require very large-scale equipment and thus a very high capital expenditure, but although this method is suitable for forming a pattern on a flat surface, Difficult to form patterns on complex shapes such as curved surfaces
Furthermore, this method is not suitable for application to general optics due to low throughput and difficult processing over large areas
[0008] The method of growing boehmite on a substrate is convenient and has high productivity, but alumina and boehmite are amphoteric compounds and thus are easily decomposed by acids and bases
Therefore, when the basic ions etc. of the base migrate to the surface and the surface becomes an alkaline environment due to the exchange action with water in the air, due to the decomposition of the surface, it becomes difficult to maintain the irregular shape, thereby degrading the performance
For substrates whose refractive index is significantly different from that of alumina, the difference in refractive index at the interface between the substrate and aluminum is so large that the antireflective properties are not sufficiently exhibited

Method used

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  • Optical transparent member and optical system using the same
  • Optical transparent member and optical system using the same
  • Optical transparent member and optical system using the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0084] A substrate of clear-float glass (composition: soda lime silicate type, refractive index ng=1.52) with a size of about 100 mm x 100 mm and a thickness of about 2 mm was ultrasonically cleaned with isopropanol, dried, And used as a glass substrate for coating.

[0085] Tetraethoxysilane (TEOS) was dissolved in ethanol (EtOH), 0.01 M phosphoric acid aqueous solution was added to the resulting solution as a catalyst, and the resulting mixture was stirred for 6 hours. At this time, the molar ratio of each component is TEOS: EtOH: H 3 PO 4 aq=1:40:2. Titanium n-butoxide (TBOT) was dissolved in ethanol, then ethyl acetoacetate (EAcAc) was added to the resulting solution as a stabilizer, and the resulting mixture was stirred at room temperature for 3 hours. The molar ratio of each component was TBOT:EtOH:EAcAc=1:20:1. TiO 2 The sol solution was added to the aforementioned SiO 2 sol solution, so that the SiO 2 :TiO 2 =95:5 molar ratio, and the resulting mixture was stir...

example 2

[0092] An S-TIH53 glass substrate (manufactured by OHARA Corporation, refractive index n=1.84) with a size of about 50 mm×50 mm and a thickness of about 1 mm was ultrasonically cleaned with isopropanol, dried, and used as a glass substrate for coating .

[0093] TiO 2 The sol solution was added to the aforementioned SiO 2 sol solution, so that the SiO 2 :TiO 2 =7:3 molar ratio, and the resulting mixture was stirred at room temperature for 2 hours, and then used as SiO 2 -TiO 2 Coating solution, as described in Example 1. Next, the aforementioned coated glass substrate was immersed in this coating solution, and a coating film was formed on the surface of the glass substrate by a dipping method (at a lifting speed of 0.5 mm / sec, and at 20° C. and 56% R.H.). The glass substrate was dried and then heat-treated by baking at 400 °C for one hour, and transparent amorphous SiO 2 / TiO 2 A film is coated thereon. The thickness and refractive index of the obtained film were meas...

example 3

[0099] The same S-TIH53 glass substrate (manufactured by OHARA Corporation, refractive index n=1.84) as in Example 2 was used as the glass substrate for coating.

[0100] Coated SiO 2 / TiO2 (7 / 3), followed by the formation of transparent amorphous SiO in the same manner as in Example 2 2 / TiO 2 membrane. The thickness and refractive index of the obtained film were measured, and the measurement results showed that the thickness was 28 nm and the refractive index n s is 1.67.

[0101] Aluminum sec-butoxide [Al(O-sec-Bu) 3 ] was dissolved in 2-propanol [IPA], ethyl acetoacetate [EAcAc] was added to the resulting solution as a stabilizer, and the resulting mixture was stirred at room temperature for about 3 hours to prepare Al 2 o 3 Sol solution. Here, the molar ratio of the solution is Al(O-sec-Bu) 3 :IPA:EAcAc=1:20:1. Titanium n-butoxide [Ti(O-n-Bu) 4 ] was also dissolved in IPA, EAcAc was added to the resulting solution, and the resulting mixture was stirred for appro...

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Abstract

It is an object to provide an optical transparent member capable of maintaining a high-performance antireflection effect for a base over a long period of time, and an optical system using the same, specifically an optical transparent member including on a base, a layer containing SiO 2 as a main component, a layer containing Al 2 O 3 as a main component, and a plate crystal layer formed from plate crystals containing Al 2 O 3 as a main component, wherein the surface of the plate crystal layer has a shape of irregularities, and an optical system using the same.

Description

technical field [0001] The present invention relates to an optically transparent member having antireflection performance and an optical system using the same, and more particularly, to an optically transparent member suitable for obtaining high antireflection performance from the visible region to the near-infrared region over a long period of time components, and optical systems using the optically transparent components. [0002] In particular, the optically transparent part of the present invention can be adapted to transparent substrates with any refractive index, exhibits excellent anti-reflection effects for visible light, and has long-term erosion resistance, so it can be used in word processors, computers, televisions Optical components of various displays such as , plasma display panels, etc.; polarizing plates of liquid crystal devices; sunglasses, gradient eyeglass lenses, viewfinder lenses for cameras, prisms, fly-eye lenses, toric lenses, Various optical filters...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00B32B33/00G02B27/18G11B7/00G02B26/10G02B13/00G02B1/115
Inventor 山田雅之小谷佳范田中博幸奥野丈晴南努辰巳砂昌弘忠永清治
Owner CANON KK
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