Process for producing glass mold

Details

Inventors: Hata, Chiemi; Hirota, Shinichiro; Sawada, Hiroyuki;
Assignee: Hoya Corporation (Tokyo, JP)
Primary Examiner: Silverman; Stanley
Assistant Examiner:
Attorney, Agent or Firm: Nixon & Vanderhye

The process for producing a glass mold according to the present invention comprises forming, on a glass mold base, a thin film consisting of diamond crystallites, graphite crystallites and amorphous carbon and having a maximum surface roughness of 200 .ANG. or below, by a plasma CVD method or a thermal CVD method using a mixed gas comprising an organic gas and hydrogen gas, the concentration of the organic gas in the mixed gas being at least 3 mole %. The glass mold obtained according to the present process has advantages of having excellent releasability of molded glass article after press molding, excellent durability and a long life.

DETAILED DESCRIPTION Therefore, an object of the present invention is to provide a process for producing a glass mold with a releasing film satisfying all of the above-mentioned requirements.
Other object will be apparent from the following descriptions and drawings.
According to the present invention, there is provided a process for producing a glass mold, which comprises forming, on a glass mold base having a shape corresponding to that of the glass article to be produced by press molding, a thin film consisting of diamond crystallites, graphite crystallites and amorphous carbon and having a maximum surface roughness of 200 .
ANG.
or below, by a plasma CVD method or a thermal CVD method using a mixed gas comprising an organic gas and hydrogen gas, the concentration of the organic gas in the mixed gas being at least 3 mole %.

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