Method for injection molding lenses

Details Method for injection molding lenses Method for injection molding lenses

1976-09-01

1978-05-23

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Utilizing plasma, electric, electromagnetic, particulate, or...

264328, 425808, B29D 1100

Patent

active

040910571

ABSTRACT:
A method and apparatus for injection molding thermoplastic lenses, such as prescription eyeglass lenses, in a single injection molding operation into a finished single vision or multifocal blank which does not require additional molding or polishing. Movable optical inserts (dies) are forced apart by injected polycarbonate, then the inserts are urged together forcing a portion of the injected polycarbonate into a pocket.

REFERENCES:
patent: 2233057 (1941-02-01), Luce
patent: 2333131 (1943-11-01), Tillyer et al.
patent: 2516373 (1950-07-01), Ehlert et al.
patent: 3240854 (1966-03-01), Ewer
patent: 3902693 (1975-09-01), Crandon et al.

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