Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses
Patent
1988-09-30
1990-09-11
Dzierzynski, Paul M.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
G02C 1102
Patent
active
049557068
ABSTRACT:
The present invention is directed to a composite, integral polymeric spectacle part. The spectacle part includes a first polymer member and a second polymer member. The polymer members are selected to provide desired characteristics for the spectacle part at the location of the spectacle part where the member is incorporated. In a particular embodiment, it is desirable that the first polymeric member be formed from an elastomeric polymer and that the second member be a substantially rigid polymer. The rigid polymer is preferably formed from a thermosetting polymer having a higher melting temperature than the first elastomeric member. The second rigid member is bound to the first polymer member by heat fusion during an injection molding process.
In the method of the invention for forming a composite, integral, polymeric spectacle part, a first polymer member is formed into a shape conforming to a portion of the cavity of an injection mold. The entire shape of the injection mold cavity defines the finished spectacle part. After the first polymeric member is inserted into the cavity portion, a second melted polymer, which has been heated to a suitable temperature above its melting temperature, is injected into the injection mold cavity so as to fill the cavity. The first polymer member and the second injected polymer are in abutting relationship in the injection mold cavity. A composite, integral polymeric spectacle part is prepared by activation and fusion of the first preformed polymer member by the heated second polymer.
REFERENCES:
patent: 4655564 (1987-04-01), Czech
patent: 4798453 (1989-01-01), Tokumara
Schmidthaler Johann J.
Zach Ronald
Dzierzynski Paul M.
Optyl Eyewear Fashion International Corporation
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