Optical glass, preform, and optical element

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United States of America Patent

PATENT NO 10689289
APP PUB NO 20180057394A1
SERIAL NO

15787057

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Abstract

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An optical glass having a small partial dispersion ratio (θg,F), while having a refractive index (nd) and Abbe number (νd) within desired ranges, is obtained. The optical glass, in mass %, comprises 10.0 to 70.0% of an SiO2 component, 1.0 to 50.0% of an Nb2O5 component, and 1.0 to 30.0% of an Na2O component, and has a refractive index (nd) of 1.62 to 1.75, an Abbe number (νd) of 30 to 42, and a partial dispersion ratio (θg,F) of no greater than 0.594.

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Patent Owner(s)

Patent OwnerAddress
OHARA INC15-30 OYAMA 1-CHOME CHUO-KU SAGAMIHARA-SHI KANAGAWA 2525286

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kikkawa, Ken Sagamihara, JP 4 20
Nagaoka, Atsushi Sagamihara, JP 27 91

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