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Optical glass

A kind of optical glass and glass technology, applied in optics, optical components, instruments, etc., can solve problems such as high cost, devitrification, and decreased glass stability

Active Publication Date: 2019-03-12
CDGM OPTICAL GLASS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The formula system usually used in this type of optical glass is the lanthanum borate glass system, but if B as a network former 2 o 3 and SiO 2 A higher content of , may lead to a decrease in the refractive index nd of the optical glass; but if there are relatively many components in the formula system that give the glass a high refractive index, it will easily lead to a decrease in the stability of the glass and devitrification during the manufacturing process.
At the same time, the cost reduction of glass is the direction of glass improvement in recent years. In the past, the expensive raw material GeO 2 ,higher cost

Method used

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Embodiment

[0089] The technical solution of the present invention will be further described in detail through examples below, but the present invention is not limited by these examples. The optical glass of the present invention can be obtained by applying the method of adjusting the content of each glass component described above with reference to the following examples.

[0090] First, in order to obtain oxide glasses having the compositions (indicated by % of cations) shown in Tables 1 to 9, raw materials such as nitrates, carbonates, sulfates, hydroxides, oxides, and boric acid were used, and each glass was weighed. The raw material powder is fully mixed to become a blended raw material, which is put into a platinum crucible and heated, melted, clarified, and stirred at 1300-1450°C to become a uniform molten glass. The molten glass was poured into a preheated mold, rapidly cooled, kept at a temperature near the glass transition temperature for two hours, and then slowly cooled to obt...

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Abstract

The invention provides an optical glass with high refraction and low dispersion characteristics whose refractive index nd is 1.78-1.95 and Abbe number νd is 32-50. The glass composition does not contain GeO2 and is not easy to devitrify. Optical glass, expressed in cation %, including: Si4+: 1-20%; B3+: 25-60%; La3+: 10-40%; Y3+: 0-15%; Nb5+: 0-20%; Ti4+: 0-15% %; Ta5+: 0-10%; W6+: 0-5%; Zr4+: 0-15%; Zn2+: 0-10%; Bi3+: 0-10%. The present invention provides an optical glass with excellent transmittance, and provides a glass preform and an optical element formed from the optical glass. The above-mentioned optical glass and an optical element such as a lens manufactured from the above-mentioned glass preform or optical element blank can be used in an optical system.

Description

technical field [0001] The present invention relates to an optical glass having high refractive index and low dispersion characteristics, and a glass preform for press molding and an optical element formed of the above glass. Background technique [0002] High refractive index low dispersion optical glass can correct chromatic aberration and miniaturize the optical system, so it has been developed rapidly in recent years. In particular, high-refractive-index low-dispersion optical glass with a refractive index nd of 1.78-1.95 and an Abbe number νd of 32-50 is increasing in market demand. [0003] The formula system usually used in this type of optical glass is the lanthanum borate glass system, but if B as a network former 2 o 3 and SiO 2 A high content of , may lead to a decrease in the refractive index nd of the optical glass; but if there are relatively many components in the formula system that endow the glass with a high refractive index, it will easily lead to probl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/068G02B1/00
CPCC03C3/068G02B1/00C03C2201/3488C03C2201/3452C03C2201/3417C03C2201/3411G02B27/0062G02B1/118G02B3/0087
Inventor 孙伟
Owner CDGM OPTICAL GLASS
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