Method for producing vitreous optical elements by injection mold

Details Method for producing vitreous optical elements by injection mold Method for producing vitreous optical elements by injection mold

1997-09-22

1999-05-18

Chin, Peter

Glass manufacturing

Processes

Forming product or preform from molten glass

65 37, 65 39, 65 45, 65 47, 65 63, 65 64, 65 83, 65122, 65124, 65126, 65209, 65213, 65215, 65221, 65223, 65226, 425808, C03B11/00

Patent

active

059047461

ABSTRACT:
Method and apparatus for producing vitreous optical elements by injection molding, which essentially includes the stages of: melting down a glass material into a molten state in a viscosity at or lower than a working point of the glass material; injecting molten glass under pressure into a mold cavity defined between transfer surfaces of relatively movable mold members of a mold assembly unit in communication with a sprue connecting the mold cavity with an injection port on the outer side of the mold assembly unit; and applying a predetermined pressure on the glass material in the mold cavity while cooling the mold assembly unit down to a temperature in the vicinity of yielding point of the glass material.

REFERENCES:
patent: 1902140 (1933-03-01), Rowe
patent: 4199343 (1980-04-01), Eolin et al.
patent: 5540746 (1996-07-01), Sasaki et al.

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