Apparatus and method for releasably fusing lens mold pieces

Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating

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156 731, 1565802, 264 127, 264 27, 264405, 4251742, 425808, B29D 1100

Patent

active

055936202

ABSTRACT:
A method and apparatus releasably secure mold pieces used to mold an artificial eye lens, for example a hydrophilic contact lens. The apparatus includes an ultrasonic welding system to provide directed energy, modified so that the output horn is convex to extend within the outer concave portion of one of the mold pieces and has a shoulder to rest upon the flange of the one piece thereby centering it. The method applies directed energy, such as ultrasonic vibrations, through the energy emitter horn to soften or melt then fuse the mating peripheral edge portion of the lens mold pieces.

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