Optical glass, precision press-molding preform, optical element and their production processes as well as image-sensing device

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United States of America Patent

PATENT NO 8431504
APP PUB NO 20110034315A1
SERIAL NO

12842184

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An optical glass that is an oxide glass and comprises, by cationic %,

    20 to 40% of a total of Si4+ and B3+,15 to 40% of a total of Nb5+, Ti4+, W6+ and Zr4+,0.2 to 20% of a total of Zn2+, Ba2+, Sr2+ and Ca2+, and15 to 55% of a total of Li+, Na+ and K+,the cationic ratio of the content of B3+ to the total content of B3+ and Si4+ being 0.01-0.5,the cationic ratio of the content of Zr4+ to the total content of Nb5+, Ti4+, W6+ and Zr4+ being 0.05 or less,the molar ratio of the total content of Zn2+ and Ba2+ to the total content of Zn2+, Ba2+, Sr2+ and Ca2+ being 0.8-1,the optical glass having a refractive index nd of 1.815 or more and an Abbe's number νd of 29 or less.

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Patent Owner(s)

Patent OwnerAddress
HOYA CORPORATIONTOKYO

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Takazawa, Hiroki Tokyo, JP 6 16

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