Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Utilizing plasma – electric – electromagnetic – particulate – or...
Patent
1979-11-29
1981-01-27
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Utilizing plasma, electric, electromagnetic, particulate, or...
219 1055M, 264 25, 264 36, 351 42, B29D 1100
Patent
active
042474930
ABSTRACT:
A technique for correcting defects in lens surfaces caused during lens formation. During the formation of a plastic lens, a low melting point alloy block is applied to the convex surface of the lens to hold the lens for working and machining. Upon removal, a defect in the lens surface, such as distortion, warping or aberration may appear in the area which was beneath the low melting point alloy. Accordingly, the lens is treated by subjecting it to microwave energy until the defect is removed from the lens surface, thereby reducing waste in the lens forming process.
REFERENCES:
patent: 3171869 (1965-03-01), Weinberg
patent: 3227507 (1966-01-01), Feinbloom
patent: 3365522 (1968-01-01), Inone
patent: 3634219 (1972-01-01), Sinai
patent: 3765861 (1973-10-01), Bole
patent: 4017238 (1977-04-01), Robinson
"Plastics-Microwaves Pro and Cons", SPE Journal, C. H. Will, Nov. 1968, vol. 24, pp. 29-32. _
Lowe James B.
O'Neill Robert E.
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