Manufacture of visual lenses

Details Manufacture of visual lenses Manufacture of visual lenses

1991-04-10

1994-01-25

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Differential fluid etching apparatus

With microwave gas energizing means

156643, 156654, 156668, 21912169, 21912173, 21912175, B44C 122, B29C 3700

Patent

active

052812944

ABSTRACT:
A consumable laser mask for forming a visual lens, especially a contact lens, in which at least a portion of the light passing through the lens is focussed by diffractive means. The laser mask is shaped to provide the diffractive means in the finished lens, and is made from a polymeric material with a thickness such that no residue is left at the completion of the laser ablation process. The invention also includes a method of manufacturing a lens using a consumable laser mask in accordance with the present invention.

REFERENCES:
patent: 3832948 (1974-09-01), Barker
patent: 4684436 (1987-08-01), Burns et al.
patent: 4994058 (1991-02-01), Raven et al.
patent: 5019074 (1991-05-01), Muller
patent: 5061840 (1991-10-01), Portney et al.

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