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:
Jun. 19, 2007
Filed:
Aug. 20, 2003
Yoshiko Kasuga, Koganei, JP;
Xuelu Zou, Akishima, JP;
Yoshiko Kasuga, Koganei, JP;
Xuelu Zou, Akishima, JP;
Hoya Corporation, Tokyo, JP;
Abstract
Provided are optical glass exhibiting a refractive index (nd) in a range of 1.75 to 1.87, an Abbé number (νd) in a range of 80 to 45, and excellent low-temperature softening properties even when not incorporating ThOas well as permitting a low production cost; a precision press molding preform and an optical element comprised of such glass; a method of manufacturing the preform; and a method of manufacturing the optical element. The optical glass comprises, in a molar percent, 30 to 45 percent of BO, 2 to 15 percent of SiO, 10 to 20 percent of LaO, 1 to 10 percent of TiO, 10 to 30 percent of ZnO, 2 to 15 percent of LiO, higher than 0 percent and 10 percent or less of WO, 0 to 15 percent of NbO, and 0 to 10 percent of ZrO, wherein the total amount of the above-mentioned components is higher than 95 percent, the glass exhibits a refractive index (nd) in a range of 1.75 to 1.87, and an Abbé number (νd) in a range of 80 to 45. The precision press molding preform and the optical element are comprised of the glass. In the method of manufacturing a precision press molding preform, the preform comprised of the optical glass is formed. The method of manufacturing an optical element employs the precision press molding preform.