Method of making a thermoplastic lens by vacuum forming

Details Method of making a thermoplastic lens by vacuum forming Method of making a thermoplastic lens by vacuum forming

1976-07-19

1978-12-12

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Utilizing plasma, electric, electromagnetic, particulate, or...

264268, 264511, 350167, B29D 1100

Patent

active

041296281

ABSTRACT:
A method of making an array of lenses includes the steps of softening a sheet of optically transparent thermoplastic material, such as a clear acrylic resin and vacuum forming the softened sheet into an array of lens shells. The shells are then filled with a clear cast acrylic-polyester resin having an index of refraction closely matching that of the sheet. A thin film of polyester material is placed over the plane surface of the cast resin and a sheet of glass is placed over the film. The resin is cured in an oxygen-inhibited atmosphere at room temperature and the glass and film are then removed, forming a planar surface on one side of each of the lenses, the other surface being convex and being formed by the acrylic resin sheet.

REFERENCES:
patent: 2067843 (1937-01-01), Tonnies
patent: 3475521 (1969-10-01), Stroop
patent: 3538198 (1970-11-01), De Montebello
patent: 3724673 (1973-04-01), Ryon

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