Method of controlling the thickness of cast lenses

Details Method of controlling the thickness of cast lenses Method of controlling the thickness of cast lenses

1989-12-11

1991-04-30

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

264 21, 425808, B29D 1100

Patent

active

050116339

ABSTRACT:
The invention is a method of metering liquid lens monomer on to the surface of a concave spin casting mold. This is done by an atomized liquid spray applied to the mold optical surface for a precise time. An inert gas such as nitrogen is used to propel the atomized spray from the spray nozzle to the optical mold surface. The atomized spray wets the optical surface evenly reducing the contact angle to the receding angle. The duration of the spray can be precisely timed by an electronic timer valve. The volume of monomer deposited can be precisely controlled therefore the lens thickness is precisely controlled.

REFERENCES:
patent: 3660545 (1972-05-01), Wichterle
patent: 4022855 (1977-05-01), Hamblen
patent: 4636338 (1987-01-01), Neefe
patent: 4944899 (1990-07-01), Morland

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