Fresnel lens manufacturing apparatus

Details Fresnel lens manufacturing apparatus Fresnel lens manufacturing apparatus

1996-08-19

1998-11-24

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

With product ejector

264334, 425437, 425DIG102, B29C 4543

Patent

active

058403523

ABSTRACT:
An apparatus for producing a Fresnel plate has a mold assembly comprising movable and stationary molds coupled with each other. The mold assembly includes a Fresnel forming face formed on the inside of the movable mold. Melted resin is injected into the mold assembly for forming the Fresnel plate. At least one movable slit is formed through, and arranged inside, the movable mold along a circle concentric with the Fresnel plate and in intermittent or continuous fashion. The movable slit is used for blowing compressed air toward the Fresnel plate. The slit closely surrounds the center of the Fresnel plate. Ejector pins surround the Fresnel plate outside its Fresnel forming face.

REFERENCES:
patent: 3952991 (1976-04-01), Schneider
patent: 4653997 (1987-03-01), Sheffield et al.

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