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. 28, 2006
Filed:
Mar. 14, 2003
Yasuhiro Fujiwara, Akishima, JP;
Zou Xuelu, Akishima, JP;
Hiroyuki Sakai, Tokyo, JP;
Shinichiro Hirota, Fuchu, JP;
Yasuhiro Fujiwara, Akishima, JP;
Zou Xuelu, Akishima, JP;
Hiroyuki Sakai, Tokyo, JP;
Shinichiro Hirota, Fuchu, JP;
Hoya Corporation, Tokyo, JP;
Abstract
Disclosed is a method of manufacturing ultraprecise lenses, including aspherical lenses, not requiring grinding or polishing after press molding. The method comprises heating a glass material to a temperature corresponding to a glass viscosity of from 10to 10dPaS so that the glass material is softened, and press molding the glass material with the pressing molds which are heated to a temperature corresponding to a glass viscosity of from 10to 10dPaS. Provided that the glass material is not heated to a temperature as high as that corresponding to a glass viscosity of 10dPaS when the pressing mold is heated to a temperature corresponding to a glass viscosity of 10and that the glass material is not heated to a temperature as low as that corresponding to a glass viscosity of 10dPaS when the pressing mold is heated to a temperature corresponding to a glass viscosity of 10dPaS. The glass material to be molded comprises at least one selected from the group consisting of NbO, WO, and TiOand has a refractive index nd of greater than or equal to 1.65, an Abbè number (ν d) of less than or equal to 35, and a sag point (Ts) of less than or equal to 570° C. Each of the pressing molds comprises a film comprising carbon on a molding surface.