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Optical glass

A technology of optical glass and weight percentage, which is applied in the field of optical glass with better low-temperature moldability, and can solve the problems of reducing production costs, high energy consumption, and disadvantages

Inactive Publication Date: 2008-10-29
ASIA OPTICAL CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The glass composition disclosed in Japanese Patent Laid-Open No. 2000-247676 must be melted at a high temperature above 1500°C, so it consumes a lot of energy, which is not conducive to reducing production costs

Method used

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Embodiment Construction

[0013] The optical glass provided by the invention, its basic composition contains SiO with a weight percentage of 2-11% 2 , 28-45% B 2 o 3 , 2~15% CaO, 3~18% ZnO, 1~8% ZrO 2 , 9-40% La 2 o 3 , 0.5-11% Gd 2 o 3 , 0~10% of Y 2 o 3 , 0~3% Al 2 o 3 , the sum of which does not exceed 8% of R 2 O (R is at least one of Li, Na or K), 0-5% of R'O (R' is at least one of Mg, Sr or Ba), 0-3% of WO 3 , 0~2% Nb 2 o 5 and 0~1% Sb 2 o 3 ; where SiO 2 , B 2 o 3 , CaO, ZnO, ZrO 2 , La 2 o 3 、Gd 2 o 3 It is an essential component of the optical glass of the present invention.

[0014] When the yield point temperature of the glass is required to be lower than 590°C, the optical glass of the present invention may have the following composition (expressed in weight percent): 6-11% SiO 2 , 28-40% B 2 o 3 , 2-12% CaO, 5-18% ZnO, 1-8% ZrO 2 , 9-30% La 2 o 3 , 1 to 11% Gd 2 o 3 , 1~10% of Y 2 o 3 , 1~7% Li 2 O, the sum of which does not exceed 8% of R 2 O (R is at le...

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Abstract

The invention provides optical glass which comprises substances according to the following weight percentage: 2 to 11 percent of SiO2; 28 to 45 percent of B2O3; 2 to 15 percent of CaO; 3 to 18 percent of ZnO; 1 to 8 percent of ZrO2; 9 to 40 percent of La2O3; 0.5 to 11 percent of Gd2O3; preferably, the optical glass further comprises 0 to 10 percent of Y2O3, 0 to 3 percent of Al2O3, not more than 8 percent of the total amount of R2O (R is at least one of Li, Na or K ), 0 to 5 percent of R'O(R' is at least one of Mg, Sr or Ba), 0 to 3 percent of WO3, 0 to 2 percent of Nb2O5 and 0 to 1 percent of Sb2O3. The optical glass of the invention does not comprise components which is harmful to the environment such as lead oxide, arsenic oxide, etc. and has the refractive index between 1.66 and 1.72, the abbe number between 51 and 56, the liquid-phase temperature LT which is less than or equal to 1000 DEG C and the melting temperature of raw materials which is less than or equal to 1300 DEG C, so the optical glass can be easily produced on scale and can be not easy to lead to the bad phenomenon of crystallization and devitrification in the production of a blank pre-mold body or precise molding lens.

Description

technical field [0001] The invention relates to an optical glass, in particular to an optical glass with better resistance to devitrification, higher mass production, no environmentally unfriendly substances, and better low-temperature moldability. Background technique [0002] As optoelectronic products such as digital cameras have higher and higher performance requirements, smaller and smaller size requirements, and higher and higher image quality requirements, the design of lenses is also becoming more and more complex. In order to meet this design requirement, an aspheric mirror must be used in the design of the optical system, and at the same time, some low-cost spherical mirrors must be used to meet the low-cost and high-quality requirements. In the production of aspheric lenses, if the grinding method is used for production, it is time-consuming, has a low pass rate and high cost. Therefore, precision press molding technology has become a mainstream and indispensable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/068
Inventor 蔡宗岳石翔仁
Owner ASIA OPTICAL CO INC
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