Title:
OPTICAL GLASS, PREFORM MATERIAL AND OPTICAL ELEMENT
Document Type and Number:
WIPO Patent Application WO/2017/175552
Kind Code:
A1
Abstract:
Provided is glass having a predetermined index of refraction (nd) and Abbe number (νd), high chemical resistance (acid resistance) and a small degree of abrasion. The optical glass contains, in wt%, 10.0-40.0% of a SiO2 component, 15.0-50.0% of a La2O3 component and 5.0% to less than 25.0% of a TiO2 component, has a mass ratio B2O3/SiO2 less than or equal to 1.00, an index of refraction (nd) of 1.78-1.95 and an Abbe number (νd) of 25-45, and chemical resistance (acid resistance) via a powder method that is class 1-3. The optical glass has a degree of abrasion of less than or equal to 200.
Inventors:
NOJIMA HIROTO (JP)
NAGAOKA ATSUSHI (JP)
OGURI FUMIHIRO (JP)
NAGAOKA ATSUSHI (JP)
OGURI FUMIHIRO (JP)
Application Number:
PCT/JP2017/010321
Publication Date:
October 12, 2017
Filing Date:
March 15, 2017
Export Citation:
Assignee:
OHARA KK (JP)
International Classes:
C03C3/095; C03C3/062; C03C3/068; C03C3/097; G02B1/00
Foreign References:
| JP2006219365A | 2006-08-24 | |||
| JP2004137145A | 2004-05-13 | |||
| JPH06144868A | 1994-05-24 | |||
| JPS5950048A | 1984-03-22 | |||
| JP2002173334A | 2002-06-21 | |||
| JP2009269771A | 2009-11-19 |
Other References:
See also references of EP 3441372A4
Attorney, Agent or Firm:
MIGITA Shunsuke et al. (JP)
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