Title:
OPTICAL GLASS AND PROCESS FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2008/111681
Kind Code:
A1
Abstract:
An optical glass which has a refractive index (nd) of 1.7 or higher and an Abbe's number (νd) of 40 or larger and contains at least 30% Ln2O3 ingredient (Ln is one or more elements selected among Y, La, and Gd) in terms of oxide amount in mass% and in which the content of As2O3 and Sb2O3 ingredients is less than 0.1%. The proportion of the Gd2O3 content to the total content of the Ln2O3 ingredient (Gd2O3/Ln2O3) is preferably 20% or lower. The glass preferably contains a B2O3 ingredient as an essential component and has a liquidus temperature of 1,100°C or lower.
Inventors:
OGINO MICHIKO (JP)
TOMOE HIROAKI (JP)
TOMOE HIROAKI (JP)
Application Number:
PCT/JP2008/054838
Publication Date:
September 18, 2008
Filing Date:
March 11, 2008
Export Citation:
Assignee:
OHARA KK (JP)
OGINO MICHIKO (JP)
TOMOE HIROAKI (JP)
OGINO MICHIKO (JP)
TOMOE HIROAKI (JP)
International Classes:
C03C3/068; C03C3/15; C03C3/155; G02B1/00
Foreign References:
| JPS5641850A | 1981-04-18 | |||
| JPS5756344A | 1982-04-03 | |||
| JPS55116641A | 1980-09-08 | |||
| JPS56100151A | 1981-08-11 | |||
| JP2003021701A | 2003-01-24 |
Attorney, Agent or Firm:
SAKAMOTO, Tohru et al. (Arakawa Building35-5, Nishishinbashi 2-chom, Minato-ku Tokyo 03, JP)
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