Optical glass for mold press forming

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United States of America Patent

PATENT NO 8951926
APP PUB NO 20140045675A1
SERIAL NO

14055929

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Abstract

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The invention provides an optical glass for press molding which can satisfy all of the following requirements: (1) it contains no environmentally undesirable components; (2) it can easily achieve a low glass transition point; (3) it has a high refractive index and high dispersion; (4) it can easily provide a glass having an excellent visible light transmittance; and (5) it has excellent resistance to devitrification during preparation of a preform. The optical glass for press molding has a refractive index nd of 1.925 or more, an Abbe's number νd of 10 to 30, and a glass composition, in % by mass, of 20 to 80% Bi2O3, 10 to 30% B2O3, and 0 to 5.5% GeO2 and is substantially free of lead component, arsenic component, and F component.

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Patent Owner(s)

  • NIPPON ELECTRIC GLASS CO., LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Matano, Takahiro Otsu, JP 21 60
Sato, Fumio Otsu, JP 82 383
Usui, Yoko Otsu, JP 5 8

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