Optical glass, optical glass blank, glass material for press molding, optical element, and methods for producing them

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United States of America Patent

PATENT NO 9561980
APP PUB NO 20150368151A1
SERIAL NO

14767322

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An aspect of the present invention relates to optical glass, wherein, in a glass composition based on oxides, a content of P2O5 is in the range of 20˜34 weight %; a content of B2O3 is over 0 weight % but 10 weight % or less; a weight ratio (B2O3/P2O5) is over 0 but less than 0.39; a weight ratio [TiO2/(TiO2+Nb2O5+WO3+Bi2O3+Ta2O5)] is in the range of 0.059˜0.180; and a weight ratio [(P2O5+B2O3+SiO2)/(Na2O+K2O+Li2O)] is in the range of 1.39˜1.80, the optical glass having a refractive index nd of 1.78˜1.83, and an Abbe's number vd of 20˜25.

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Patent Owner(s)

  • HOYA CORPORATION

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujiwara, Yasuhiro Tokyo, JP 99 683
Kuwatani, Shungo Tokyo, JP 3 6

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