Glass manufacturing – Processes – Sequentially forming – reheating – and working
Reexamination Certificate
2006-11-28
2006-11-28
Vincent, Sean (Department: 1731)
Glass manufacturing
Processes
Sequentially forming, reheating, and working
C065S024000, C065S026000, C065S063000, C065S102000
Reexamination Certificate
active
07140205
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 105to 109dPaS 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 108to 1012dPaS. Provided that the glass material is not heated to a temperature as high as that corresponding to a glass viscosity of 105dPaS when the pressing mold is heated to a temperature corresponding to a glass viscosity of 108and that the glass material is not heated to a temperature as low as that corresponding to a glass viscosity of 109dPaS when the pressing mold is heated to a temperature corresponding to a glass viscosity of 1012dPaS. The glass material to be molded comprises at least one selected from the group consisting of Nb2O3, WO3, and TiO2and 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.
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Fujiwara Yasuhiro
Hirota Shin-ichiro
Sakai Hiroyuki
Xuelu Zou
Hoya Corporation
Sughrue & Mion, PLLC
Vincent Sean
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