Glass composition moldable into an optical element with reduced

Details Glass composition moldable into an optical element with reduced Glass composition moldable into an optical element with reduced

1996-09-18

1999-07-06

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 63, 501 66, 501 67, 501 78, 501903, C03C 3068, C03C 3095

Patent

active

059197188

ABSTRACT:
A mold has a moling surface of a material containing silicon carbide and/or silicon nitride as a main component and a carbon thin film formed on the molding surface to prevent fusion sticking. A glass substance which has a sag point not higher than 565.degree. C. and a predetermined composition free from arsenic oxide is introduced into the mold. The glass substance is press-formed in a heated and softened condition into a glass optical element of high precision.

REFERENCES:
patent: 4438211 (1984-03-01), Mennemann et al.
patent: 4521524 (1985-06-01), Yamashita
patent: 4686196 (1987-08-01), Gliemeroth et al.
patent: 4812423 (1989-03-01), Kodama et al.
patent: 5039631 (1991-08-01), Krashkevich et al.
patent: 5607886 (1997-03-01), Onozawa

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