Apparatus for treating an ophthalmic lens mold

Details Apparatus for treating an ophthalmic lens mold Apparatus for treating an ophthalmic lens mold

1994-03-30

1995-11-14

Vargot, Mathieu D.

Plastic article or earthenware shaping or treating: apparatus

Means applying electrical or wave energy directly to work

Radiated energy

4251748E, 425436RM, B29D 1100

Patent

active

054661447

ABSTRACT:
An apparatus and method for directing accelerated electrons to at least part of one surface of one ophthalmic mold piece prior to filling with monomer and lens polymerization. In particular it has been found that generation of the ionized oxygen by means of a corona treatment electrode sufficiently increases the adherence of the polymer to the mold piece so treated. In the preferred embodiment, the flange around the convex, male piece of the lens mold is corona treated so that when the mold pieces are separated after lens polymerization, the flashing of excess polymerized material surrounding the lens cavity adheres to that male, convex piece flange while the lens is removed with the female, concave piece.

REFERENCES:
patent: 2763609 (1956-09-01), Lewis et al.
patent: 3915609 (1975-10-01), Robinson
patent: 4017238 (1977-04-01), Robinson
patent: 5252265 (1993-10-01), Cirri
patent: 5294379 (1994-03-01), Ross et al.

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