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1. (WO2018043475) GLASS, GLASS MATERIAL FOR PRESS MOLDING, OPTICAL ELEMENT BLANK, AND OPTICAL ELEMENT

Pub. No.:    WO/2018/043475    International Application No.:    PCT/JP2017/030898
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Wed Aug 30 01:59:59 CEST 2017
IPC: C03C 3/068
G02B 1/00
Applicants: HOYA CORPORATION
HOYA株式会社
Inventors: NEGISHI Tomoaki
根岸 智明
Title: GLASS, GLASS MATERIAL FOR PRESS MOLDING, OPTICAL ELEMENT BLANK, AND OPTICAL ELEMENT
Abstract:
Provided is a glass which is an oxide glass which has an Abbe number νd of not less than 35.5 but less than 39.0, and satisfies the relationship nd ≥ -1.0000 × 10-2 × νd + 2.2726, and has such a glass composition expressed in cation% that the total content of B3+ and Si4+, the total content of La3+, Gd3+, Y3+, and Yb3+, the total content of Ti4+, Nb5+, Ta5+, and W6+, and the cation ratios {(La3+ + Gd3+ + Y3+ + Yb3+)/(Ti4+ + Nb5+ + Ta5+ + W6+)}, {Zn2+/(B3+ + Si4+)}, (B3+/La3+), {Gd3+/(La3+ + Gd3+ + Y3+ + Yb3+)}, {Y3+/(La3+ + Gd3+ + Y3+ + Yb3+)}, {Ti4+/(Ti4+ + Nb5+ + Ta5+ + W6+)}, {Ta5+/(Ti4+ + Nb5+ + Ta5+ + W6+)}, {W6+/(Ti4+ + Nb5+ + Ta5+ + W6+)}, {(B3+ + Si4+)/(La3+ + Gd3+ + Y3+ + Yb3+)}, and {(B3+ + Si4+)/(Ti4+ + Nb5+ + Ta5+ + W6+)} fall within respective predetermined ranges, and for cationic components described in table 1, the sum A of values obtained by multiplying the contents of the cationic components by respective coefficients described in table 1 satisfies a predetermined formula with respect to a refractive index nd.