Die for press-molding optical element

Details Die for press-molding optical element Die for press-molding optical element

1991-10-31

1992-12-15

Lindsay, Robert L.

Glass manufacturing

Apparatus made of special material

Metal-nonmetal composite

65 26, 6537412, 65 36, C03B 518

Patent

active

051713489

ABSTRACT:
A die for press-molding an optical element with high precision comprises a base material made of a material excellent in heat resistance, heat shock resistance and mechanical strength at high temperature, an intermediate layer formed on the base material and made of a thin film excellent in grinding machinability and cutting machinability, and a surface protective layer formed on the intermediate layer and made of a metal thin film excellent in heat resistance and mechanical strength at high temperature and less reactive to a material of the optical element. Additional thin film may be inserted between the base material and the intermediate layer so as to enhance the adhesion strength between the base material and the intermediate layer. In place of the additional thin film to be inserted, a peripheral flange part of the intermediate layer is removed and thus on the removed peripheral part, the surface protective layer is directly adhered to the base material.

REFERENCES:
patent: 4168961 (1979-09-01), Blair
patent: 4251254 (1981-02-01), Klomp et al.
patent: 4629487 (1986-12-01), Monji et al.
patent: 4685948 (1987-08-01), Kuribayashi et al.

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