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Optical glass

An optical glass and glass technology, applied in the field of glass preforms and optical components, can solve the problems of reduced devitrification resistance and rising liquidus temperature of glass, and achieves low liquidus temperature, high devitrification resistance, and excellent transmission. rate effect

Inactive Publication Date: 2017-03-01
CDGM OPTICAL GLASS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the glass also contains a lot of ZnO, which leads to a decrease in the devitrification resistance of the glass and an increase in the liquidus temperature.

Method used

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Embodiment

[0084] The present invention is explained using the following examples, but the present invention should not be limited to these examples.

[0085] [Optical glass example]

[0086] First, in order to obtain glasses No. 1-35 having the compositions shown in Table 1-Table 4, carbonates, nitrates, sulfates, hydroxides, oxides, boric acid, etc. were used as raw materials to prepare optical glass components Corresponding raw materials Weigh each raw material in proportion, mix them thoroughly to become a blended raw material, put the blended raw material into a platinum crucible, heat to 1380-1450°C, clarify and stir for 3-5 hours, and then become a uniform melting Glass, then pour the molten glass into a preheated mold and keep it at 650-700° C. for 2-4 hours, then slowly cool it to obtain the optical glasses of Glass No. 1-35.

[0087] Moreover, the characteristic of each glass was measured by the method shown below, and the measurement result is shown in Table 1-Table 4.

[00...

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Abstract

The invention provides optical glass with high refraction power and low chromatic dispersion. The optical glass comprises, by weight, 1 to 30% of B2O3, 0 to 20% of SiO2, 25 to 55% of La2O3, 5 to 40% of Gd2O3, 0 to 25% of Y2O3, 0 to 10% of Yb2O3, 0 to 10% of Ta2O5, 1 to 30% of Nb2O5, 0 to 10% of TiO2, 0.5 to 20% of ZrO2, 0 to 10% of WO3, 0 to 10% of Al2O3, 0 to 10% of GeO2 and 0 to 10% of Bi2O3. The optical glass does not contain ZnO and has a refractive index of 1.80 to 1.95 and an Abbe number of 33 to 45. The optical glass with excellent transmittance, high refraction power and low chromatic dispersion is obtained by reducing the content of Ta2O5 in the composition of the glass, introducing a proper amount of rare earth oxides with high refraction power and low chromatic dispersion and optimizing the ratio of the components.

Description

technical field [0001] The invention relates to an optical glass with high refractive index and low dispersion characteristics, as well as a glass preform and an optical element formed from the optical glass. Background technique [0002] Combining lenses made of high refractive index and low dispersion optical glass with lenses made of high refractive index and high dispersion optical glass can correct chromatic aberration and miniaturize the optical system, especially when the refractive index nd is 1.86-1.92 and the Abbe number νd is 36-42 high refractive index low dispersion optical glass, the market demand is increasing day by day. [0003] Japanese Patent Application No. 2001-348244, Patent Application No. 2007-269584, and Chinese CN101386469A all disclose this type of high-refraction and low-dispersion optical glass. In the examples of the description, optical glass components with a refractive index of 1.86 or more contain a large amount of Ta 2 o 5 , while Ta 2 o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/068C03C4/00
Inventor 孙伟
Owner CDGM OPTICAL GLASS
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