Opticla glass

A kind of optical glass and glass technology, applied in the field of phosphate glass, can solve the problems of easy cracks, high liquidus temperature and defects in cooling glass, and achieve the effect of less temperature load, low liquidus temperature and good productivity

Inactive Publication Date: 2009-02-11
OHARA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In Japanese Patent Laid-Open No. 2002-211949, it is disclosed that P 2 o 5 , B 2 o 3 、Al 2 o 3 , BaO is the main component of optical glass, but because it contains a large amount of Al, cracks and cracks are likely to occur when the glass is cooled.
[0013] In Japanese Patent Laid-Open No. 2006-52119, it is disclosed that P 2 o 5 , B 2 o 3 , Optical glass with MgO as the main component, but because it contains a large amount of Mg, the liquidus temperature tends to become high, and it is difficult to produce stably

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Examples

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Embodiment Construction

[0138] The compositions of Examples (No.1 to No.34) of the optical glass of the present invention and the composition of Example 2 described in JP 2004-262703 and the composition of Example 1 described in JP 2004-168593 are used as comparative examples (No.A, and No.B), optical constants (nd, vd), glass transition temperature (Tg), yield point At, average linear expansion coefficient α from 100 to 300°C, internal transmittance, liquidus temperature, The water resistance (RW) and specific gravity of the powder method are shown in Tables 2-6 and 8 and 9. Furthermore, the anomalous dispersion is shown in Table 7.

[0139] Furthermore, the glass of the Examples (No.1-No.34) of the present invention is obtained as follows: Common raw materials for optical glass such as oxides, carbonates, phosphates, and nitrates are weighed in a predetermined ratio, and after mixing, Put it into a platinum crucible, etc., according to the melting property of the glass composition, melt it at a te...

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Abstract

The invention provides a phosphate glass, which is suitable for manufacturing a non-spherical die mold, a glass pre-forming blank, and the like due to low dispersivity, low glass transition temperature (Tg) and low average coefficient of linear expansion (alpha). An optical glass is characterized in that the optical glass contains P2O5, B2O3, BaO, Al2O3 and La2O3 as necessary components, on the basis of weight percent of an oxide, the total content of Al2O3 and La2O3 is 1 to 10 percent, the value of the Al2O3 content / the La2O3 content ranges from 0.05 to 8.0, and the water resisting property RW of the glass measured by a measuring method (powder method) for chemical durability of the optical glass by JOGIS06<-1999> is level 1 to 3.

Description

technical field [0001] The present invention relates to a phosphate glass which is suitable for aspheric press molding and its glass preform etc. due to its low dispersion, low glass transition temperature (Tg) and low average linear expansion coefficient (α). manufacturing. In particular, the present invention relates to 2 o 5 , B 2 o 3 、Al 2 o 3 , BaO, Li 2 O, the above-mentioned optical glass that can be produced extremely stably because the liquidus temperature is low, so the temperature load on the manufacturing equipment is small. Background technique [0002] Aspheric lenses are used to reduce the number of lenses, thereby reducing the weight and miniaturization of optical components such as lenses, which has become increasingly strong in recent years. However, obtaining an aspheric surface by the conventional grinding and polishing process requires high cost and complicated operation process. Therefore, a method has been developed in which a preform material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/19C03B11/08
CPCY02P40/57
Inventor 清水晃治
Owner OHARA
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