Method for producing a dioptric photocromic semi-finished lens

Details Method for producing a dioptric photocromic semi-finished lens Method for producing a dioptric photocromic semi-finished lens

1996-08-13

1998-09-01

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Composite or multiple layer

264 27, 156 99, B29D 1100

Patent

active

058007440

ABSTRACT:
A method of producing a dioptric photochromic semi-finished lens, a diopter of which is to be imparted by grinding a concave surface of the semi-finished lens. Color concentration between a center portion and a peripheral portion is maintained at a fixed color concentration independent of the diopter of the lens and the lens is shockproof. In the method, after mixing a photochromic material with a thermoplastic polycarbonate resin to make a sheet, the sheet is processed to have a spherical surface sheet, set in a mold and thermoplastic polycarbonate resin is injected in the mold to be bonded with the sheet.

REFERENCES:
patent: 4139586 (1979-02-01), Gasson
patent: 5084226 (1992-01-01), Tarhon et al.
patent: 5286419 (1994-02-01), Van Ligten et al.
patent: 5405557 (1995-04-01), Kingsbury
patent: 5523030 (1996-06-01), Kingsbury

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