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1. (WO2013146378) OPTICAL GLASS AND USE THEREOF

Pub. No.:    WO/2013/146378    International Application No.:    PCT/JP2013/057496
Publication Date: Fri Oct 04 01:59:59 CEST 2013 International Filing Date: Sat Mar 16 00:59:59 CET 2013
IPC: C03C 3/068
G02B 1/00
Applicants: HOYA CORPORATION
HOYA株式会社
NEGISHI, Tomoaki
根岸 智明
Inventors: NEGISHI, Tomoaki
根岸 智明
Title: OPTICAL GLASS AND USE THEREOF
Abstract:
One embodiment of the present invention relates to an optical glass which is an oxide glass that has a (Si4+ + B3+) content of 10 to 60 cation%, a (La3+ + Gd3+ + Y3+ + Yb3+) content of 25 to 70 cation%, a (Ti4+ + Nb5+ + W6+ + Bi3+) content of 10 to 20 cation%, a Li+ content of 0 to 5.0 cation% and a Ge content of less than 5.0 mass% in terms of GeO2 content, does not contain Pb, has a cation ratio (Si4+/B3+) of 0.70 or less, a ratio ((La3+ + Gd3+ + Y3+ + Yb3+)/(Ti4+ + Nb5+ + W6+ + Bi3+)) of 1.90 to 7.00 and a ratio (Y3+/(La3+ + Gd3+ + Y3+ + Yb3+)) of 0.180 or less, contains Nb5+ as an essential component, and has a ratio (Ti4+/Nb5+) of 4.00 or less, wherein the nd value is more than 1.920 and up to 2.000, the νd value is 28.0 to 34.0, the deformation point is higher than 645˚C, and the deviation (ΔPg,F) of the partial dispersion ratio (Pg,F) from the normal line is 0.0005 or less.