Title:
OPTICAL GLASS, PREFORM, AND OPTICAL ELEMENT
Document Type and Number:
WIPO Patent Application WO/2019/131123
Kind Code:
A1
Abstract:
Provided is an optical glass which can contribute to reducing the weight of optical elements and optical devices while still having a refractive index (nd) and Abbe's number (νd) within desired ranges. This optical glass contains, on a mass basis, 0 (exclusive) to 15.0% of a SiO2 component, 0 (exclusive) to 17.0% of a B2O3 component, 32.0 to 62.0% of a La2O3 component, and 6.0 to 37.0% of a TiO2 component, and has a refractive index (nd) of 2.00 or more, and an Abbe's number (νd) of 20 to 30. The refractive index (nd), Abbe's number (νd), and specific gravity ρ satisfy the relationship: 5.00 ≤ (nd × 2 + νd)/ρ ≤ 7.00.
Inventors:
MOMONO KIYOYUKI (JP)
Application Number:
PCT/JP2018/045636
Publication Date:
July 04, 2019
Filing Date:
December 12, 2018
Export Citation:
Assignee:
OHARA KK (JP)
International Classes:
C03C3/068; G02B1/00
Domestic Patent References:
| WO2013129302A1 | 2013-09-06 | |||
| WO2015025943A1 | 2015-02-26 |
Foreign References:
| JP2010030879A | 2010-02-12 | |||
| JPS60131845A | 1985-07-13 |
Attorney, Agent or Firm:
SHOBAYASHI Masayuki et al. (JP)
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