Method of making toric spin cast lenses

Details Method of making toric spin cast lenses Method of making toric spin cast lenses

1984-12-03

1985-09-17

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

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

264 21, 264311, 425808, B29D 1100

Patent

active

045419698

ABSTRACT:
A method of spin casting toric meniscus concave surfaces by displacing the axis of rotation away from the perpendicular in synchronized movement with the molds rotation. The speed of mold rotation and the movement from the perpendicular are synchronized to displace the liquid lens monomer in two opposite directions during polymerization. A toric concave meniscus is thus formed and the liquid monomer is allowed to thicken and polymerize to form a solid lens having a toric concave surface.

REFERENCES:
patent: 2525664 (1950-10-01), Gadsby et al.
patent: 3699089 (1972-10-01), Wichterle
patent: 3822089 (1974-07-01), Wichterle
patent: 4378953 (1983-04-01), Winn
patent: 4424175 (1984-01-01), Neefe

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