Optical glass, precision press-molding preform, process for...

Details Optical glass, precision press-molding preform, process for... Optical glass, precision press-molding preform, process for...

2008-04-01

2008-04-01

Brunsman, David M (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S064000, C501S903000

Reexamination Certificate

active

07351675

ABSTRACT:
An optical glass taking account of meltability and the moldability of a preform, having optical constants including a refractive index (nd) of at least 1.57 but less than 1.67 and an Abbe's number (νd) of over 55 but not more than 65, having the property of softening at a low temperature and being suitable as a glass for precision press-molding, the optical glass including an optical glass containing B2O3, SiO2, La2O3, Gd2O3, an alkali metal oxide and an alkaline earth metal oxide as essential components, having a B2O3and SiO2total content of 52% by weight or more and having an SiO2/B2O3content ratio of from 0.38 to 1.2, and an optical glass wherein the relationship of the refractive index (nd) and the Abbe's number (νd) satisfies the equation (1),in-line-formulae description="In-line Formulae" end="lead"?νd>260−126×nd.   (1)in-line-formulae description="In-line Formulae" end="tail"?

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“1991 Data Book of Glass Composition”, p. 91, published by Glass Manufacturers' Association of Japan (GMAJ).

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