Title:
GLASS, GLASS MATERIAL FOR PRESS MOLDING, OPTICAL ELEMENT BLANK, AND OPTICAL ELEMENT
Document Type and Number:
WIPO Patent Application WO/2018/043475
Kind Code:
A1
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.
Inventors:
NEGISHI TOMOAKI (JP)
Application Number:
PCT/JP2017/030898
Publication Date:
March 08, 2018
Filing Date:
August 29, 2017
Export Citation:
Assignee:
HOYA CORP (JP)
International Classes:
C03C3/068; G02B1/00
Domestic Patent References:
| WO2013069528A1 | 2013-05-16 |
Foreign References:
| JP2014062024A | 2014-04-10 | |||
| JP2014062025A | 2014-04-10 | |||
| JP2014221704A | 2014-11-27 | |||
| JP2016074556A | 2016-05-12 |
Attorney, Agent or Firm:
SIKS & CO. (JP)
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