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:
Nov. 11, 2003
Filed:
Mar. 27, 2002
Michio Endo, Tokyo, JP;
Hoya Corporation, Tokyo, JP;
Abstract
An optical glass that substantially does not contain any Ta O and has high-refractivity low-dispersion optical properties and various optical parts made of such optical glass are provided stably at a low cost, and an optical part made thereof is provided, the optical glass having a glass composition comprising, by weight %, 0 to 7% of SiO , 18 to 30% of B O , provided that the total content of SiO and B O is 23 to 35%, 2 to 10% of ZnO, 30 to 50% of La O , 0 to 20% of Gd O , 0 to 20% of Y O , provided that the total content of La O , Gd O and Y O is 45 to 60%, 3 to 8% of ZrO and 3 to 12% of Nb O , the total content of these components being at least 95% by weight, the optical glass having a refractive index [nd] and an Abbe's number [&ngr;d] which satisfy specified relational expressions.