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

Optical: systems and elements – Lens – With multipart element

Reexamination Certificate

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Details

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.

REFERENCES:
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patent: 6025064 (2000-02-01), Kawata et al.
patent: 6315937 (2001-11-01), Takeuchi et al.
patent: 57-109618 (1982-07-01), None
patent: 2-32301 (1990-02-01), None
patent: 2-133327 (1990-05-01), None
patent: 5-169464 (1993-07-01), None
patent: 6-114860 (1994-04-01), None
patent: 7-148857 (1995-06-01), None
patent: 9-216232 (1997-08-01), None
patent: 2001-91718 (2001-04-01), None
International Search Report, completed Mar. 4, 2003.

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