The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 29, 2013
Filed:
Jun. 02, 2010
Satoru Tomeno, Tokyo, JP;
Jun Sasai, Tokyo, JP;
Hiroyuki Ohkawa, Tokyo, JP;
Kenji Imakita, Tokyo, JP;
Yuki Kondo, Tokyo, JP;
Satoru Tomeno, Tokyo, JP;
Jun Sasai, Tokyo, JP;
Hiroyuki Ohkawa, Tokyo, JP;
Kenji Imakita, Tokyo, JP;
Yuki Kondo, Tokyo, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
An object of the invention is to provide an optical glass for precision press having optical properties of a high refractive index and a low dispersion property and having a low molding temperature, a high devitrification resistance, an excellent molding property, and a small specific gravity. The optical glass of the invention contains, in terms of % by mass on the basis of oxides, respective components of BO: 10 to 20%, SiO: 0.5 to 12%, LaO: 25 to 50%, GdO: 0 to 20%, YO: 0 to 20%, provided that LaO+GdO+YO: 35 to 60%, ZnO: 5 to 20%, LiO: 0.2 to 3%, ZrO: 0 to 0.5%, TaO: 3 to 18% and WO: 3 to 20%, and has optical constants of a refractive index nof 1.84 to 1.86 and an Abbe number vof 37 to 42 and a glass transition point (T) of 630° C. or lower.