Gasket for molding plastic lens

Details Gasket for molding plastic lens Gasket for molding plastic lens

2004-10-29

2010-11-30

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...

C264S002300

Reexamination Certificate

active

07842203

ABSTRACT:
A mold (1) for molding a plastic lens is formed of a first mold (3) which forms one lens surface of the plastic lens, a second mold (4) which forms the other lens surface of the plastic lens, and a cylindrical gasket (2) into which the first and second molds (3, 4) are to be pressed. An elastically deformable projecting band (5) which has a triangular section and tapers gradually toward its distal end integrally projects on the inner circumferential surface of the gasket (2). The projecting band (5) projects on the inner circumferential surface of the gasket (2) throughout an entire circumference to form a ring-like shape, and inclines upward with respect to an axis (L) of the gasket (2). The first mold (3), when pressed into the gasket (2), presses the projecting band (5) to elastically deform it downward.

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