Method and apparatus for manufacturing large double-sided...

Details Method and apparatus for manufacturing large double-sided... Method and apparatus for manufacturing large double-sided...

2006-09-12

2006-09-12

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With multipart element

C359S743000, C359S748000, C264S002200, C264S002700, C264S313000, C264S316000

Reexamination Certificate

active

07106528

ABSTRACT:
A method of manufacturing a large double-sided curved Fresnel lens. The method includes a machining step (A) of performing ultra-precise three-dimensional machining on an upper mold and a lower mold to each have an upper transfer surface and a lower transfer surface engaging an upper surface and a lower surface of a thermoplastic resin plate, respectively. Further, the method includes a hot press molding step (B) of pressing the thermoplastic resin plate between the upper and lower molds by a predetermined pressure with the resin plate being held at a temperature higher than a softening temperature thereof and lower than a melting temperature thereof so that the thermoplastic resin plate is curved, and both lens surfaces for the double-sided Fresnel lens are respectively transferred to an upper surface and a lower surface of the thermoplastic resin plate.

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International Search Report, completed Mar. 4, 2003.

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