Injection molding instrument for forming resin concave lenses

Details Injection molding instrument for forming resin concave lenses Injection molding instrument for forming resin concave lenses

1984-02-27

1985-12-24

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means between charger and mold to cut off flow of...

264 11, 26432812, 425566, 425572, 425588, 425808, B29C 4528, B29D 1100

Patent

active

045603421

ABSTRACT:
Apparatus for forming a concave lens of resin material and adapted to be used, for example, in spectacles, video projection devices, etc., whereby raw material is fed into substantially the center thinner portion of the mold first and then radially outwardly until the material reaches the periphery, thereby to eliminate weld lines in the produced lenses.

REFERENCES:
patent: 3136000 (1964-06-01), Slyk
patent: 4106887 (1978-08-01), Yasuike et al.
patent: 4257988 (1981-03-01), Matos et al.
patent: 4289468 (1981-09-01), von Holdt
patent: 4364878 (1982-12-01), Laliberte et al.
patent: 4434120 (1984-02-01), Aloisio, Jr. et al.

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