Method of manufacturing glass optical elements

Glass manufacturing – Processes – Sequentially forming – reheating – and working

Reexamination Certificate

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Details

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.

REFERENCES:
patent: 5873921 (1999-02-01), Hirota et al.
patent: 2002/0042337 (2002-04-01), Zou et al.
patent: 2002/0073735 (2002-06-01), Hayashi et al.
patent: 62-207726 (1987-09-01), None
patent: 07-010556 (1995-01-01), None
patent: 08-119639 (1996-05-01), None
patent: 08-157231 (1996-06-01), None
patent: 08-259241 (1996-10-01), None
patent: WO 0202470 (2002-01-01), None

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