Optical glass

A technology of optical glass and weight percentage, applied in the field of optical glass, can solve the problems of strong erosiveness of smelting device and difficult smelting glass, and achieve the effect of solving the problems of stripes and crystallization, reducing production cost and improving transmittance.

A technology of optical glass and weight percentage, applied in the field of optical glass, can solve the problems of strong erosiveness of smelting device and difficult smelting glass, and achieve the effect of solving the problems of stripes and crystallization, reducing production cost and improving transmittance.

CN104876440AActive Publication Date: 2015-09-02HUBEI NEW HUAGUANG NEW INFORMATION MATERIALS CO LTD
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Experimental program
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Effect test

Embodiment 1-36 and comparative example 1-6

[0074] Choose SiO 2 , B 2 o 3 , La 2 o 3 , Nb 2 o 5 , ZrO 2 , CaO, Li 2 O, Na 2 O, Sb 2 o 3 Respectively corresponding oxides, carbonates, nitrates and other raw materials with a purity greater than 99% are weighed and proportioned according to the weight percentages shown in Table 1-7, mixed evenly, and added to a platinum crucible. The degree of ease varies with the components. Generally, at a temperature of 1250-1350°C, after melting for 1 hour and stirring for 3 hours, they are poured into a mold and cooled slowly to obtain these glass samples, and then processed into Optical glass samples.

[0075] Performance Testing

[0076] The refractive index (nd), Abbe's number (υd), glass transition temperature (Tg), and 20°C to Coefficient of linear expansion at 120°C (α 20～120 ), density (ρ), crystallization upper limit temperature (L T ), coloring degree (λ 80 / λ 5 ), water resistance (Dw), the number of Pt-containing foreign objects in the glass (pieces / 100cm ...

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Abstract

The invention provides optical glass. The optical glass comprises the following components (measured by oxide) in percentage by weight: 30-40% of SiO2, 1-10% of B2O3, 33-45% of SiO2+B2O3, 0-10% of La2O3, 25-40% of Nb2O5, 60-75% of Nb2O5+SiO2, 3-10% of ZrO2, 1-20% of CaO, 5-15% of Li2O, 0-10% of Na2O and 0-0.2% of Sb2O3, wherein 3<= SiO2 / B2O3<=14 and 0.65<=Nb2O5 / SiO2<=1.3; the optical glass does not contain TiO2, ZnO, BaO, Th, Pb, As, Cd, Hg, GeO2, TeO2, Ta2O5 and Yb2O3; and the refractive index nd of the optical glass is within the range of 1.70-1.75, and the Abbe number upsilon d is within the range of 32-38. The optical glass is low in devitrification tendency, high in transmittance, low in maximum crystallization temperature and suitable for mass production, and is mainly used for digital products, cameras, liquid crystal projectors and the like.

Description

technical field [0001] The present invention relates to optical glass suitable for optical lenses used in digital cameras, video cameras and optical communications. In particular a refractive index (n d ) in the range of 1.70 to 1.75, the Abbe number (υ d ) in the range of 32 to 38, the density is lower than 3.50g / cm 3 , the optical glass whose glass transition temperature is below 550°C and whose transmittance can reach more than 5% at a wavelength of 330nm or shorter. Background technique [0002] Optical glass is a glass material used to manufacture lenses, prisms, mirrors and windows in optical instruments or mechanical systems. Optical glass has good light transmission performance and high refractive index, and is widely used in the manufacture of optical instruments such as spectacle lenses, cameras, telescopes, microscopes and lenses. With the advancement of science and technology and the upgrading of digital products, the demand for optical glass is also increasi...

Claims

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Application Information

Patent Timeline
02 Sep 2015
Publication
CN104876440A
IPC
C03C4/00; C03C3/068; C03C3/064
Inventors
戎俊华; 刘向东