Method of injection molding thin thermoplastic lenses

Details Method of injection molding thin thermoplastic lenses Method of injection molding thin thermoplastic lenses

2005-06-08

2010-12-21

Johnson, Christina (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Changing mold size or shape during molding or with shrinkage...

C264S001100

Reexamination Certificate

active

07854865

ABSTRACT:
Methods are disclosed to injection mold resins, like polycarbonate, to form solid optical lenses. The lenses are ideally suited for use as very thin coating carriers. The method involves closing the mold with a clamp force less than the force exerted on the insert during injection. During injection the mold is allowed to breathe thereby overcoming many of the obstacles associated with injection molding very thin lenses. As the injection pressure subsides, the mold begins to close to perform a coining operation, resulting in a strong, high yield carrier or lens.

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D.J. Brunelle, G. Kailasam, Polycarbonates, GE Research & Development Center, Technical Information Series, Feb. 2002, pp. 1-32.

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