Title:
OPTICAL GLASS, OPTICAL ELEMENT, OPTICAL SYSTEM, AND OPTICAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/161441
Kind Code:
A1
Abstract:
In percentage by weight, this optical glass contains 15 - 36% SiO2, 13 - 31% B2O3, 4 - 27% Al2O3, 0 - 19% Ta2O5, 0 - 10% ZrO2, and 0 - 10% Nb2O5, wherein Ta2O5 + Nb2O5 + ZrO2 ≥ 7.1%. The index of refraction nd is equal to or greater than 1.54 and less than 1.61, and Abbe's number vd is an optical constant in the range of 50 - 57. Furthermore, ΔPg,F, which indicates anomalous dispersion properties is −0.004 or less.
Inventors:
KOIDE TETSUYA (JP)
YAMAMOTO HIROSHI (JP)
YAMAMOTO HIROSHI (JP)
Application Number:
PCT/JP2013/057528
Publication Date:
October 31, 2013
Filing Date:
March 15, 2013
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
C03C3/064; C03C3/066; G02B1/00
Foreign References:
| JP2004244226A | 2004-09-02 | |||
| JPS6183645A | 1986-04-28 | |||
| JP4610046B2 | 2011-01-12 |
Other References:
"Method (powder method) for measuring the chemical durability of an optical glass", JAPANESE OPTICAL GLASS INDUSTRIAL STANDARD JOGIS, June 2008 (2008-06-01)
Attorney, Agent or Firm:
NAGAI, Fuyuki et al. (JP)
Fuyuki Nagai (JP)
Fuyuki Nagai (JP)
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