Preparation of photochromic silver halide gradient lenses of...

Details Preparation of photochromic silver halide gradient lenses of... Preparation of photochromic silver halide gradient lenses of...

G - Physics

02

C

88/38, 96/76

G02C 7/10 (2006.01) C03C 4/06 (2006.01) G02B 5/23 (2006.01)

Patent

CA 1105760

AO-3067 PREPARATION OF PHOTOCHROMIC GRADIENT LENSES OF COSMETICALLY IMPROVED COLOR Abstract of the Disclosure Glass lenses, or lens blanks, containing all the ingredients necessary to produce phototropic, or photochromic, behavior, are treated in a conventional production furnace to produce a locally variable heat treatment, wherein at least one portion thereof is raised to a temperature exceeding the glass strain point but not the softening point, and other portions are heated to variable temperature decreasing from the strain point. The treatment causes development of phototropic, or photochromic, behavior only in those portions of the lenses, or lens blanks, exposed to the temperature above the strain point. The lenses resulting are characterized by trichromatic coeffioients, x=0.306 and y=0.307, in the unactivated state and x-0.324 and y=00321, in an activated state and including a small but effective quantity of cobalt oxide.

271864

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