Plastic article or earthenware shaping or treating: apparatus – Means applying electrical or wave energy directly to work – Radiated energy
Patent
1988-12-21
1991-01-29
Hoag, Willard
Plastic article or earthenware shaping or treating: apparatus
Means applying electrical or wave energy directly to work
Radiated energy
425808, B29C 3508
Patent
active
049882740
ABSTRACT:
A plastic optical element with good dimensional accuracy and no strain is produced by providing a mold having a cavity corresponding to a shape of the optical element and a feed passage which communicates with said cavity, at least one side of which mold for forming one surface of the optical element is made of a light transmitting material so that light can pass through said material into the mold cavity, charging a photocurable plastic material through said feed passage into said cavity, irradiating a central part of said cavity with light which initiates a photocuring reaction, and enlarging the light in the form of a ring until the lighted area reaches the periphery of the cavity so as to cure the entire photocurable plastic material. The light irradiation is carried out while a supplementary portion of the photocurable plastic material is maintained in said feed passage.
REFERENCES:
patent: 3242806 (1966-03-01), Hine
patent: 3848970 (1974-11-01), Goodell
patent: 4022855 (1977-05-01), Hamblen
patent: 4166088 (1979-08-01), Neete
patent: 4701005 (1987-10-01), Noguchi
patent: 4728469 (1988-03-01), Danner et al.
Dresser Industries Inc.
Hoag Willard
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