Fresnel lens and an illuminating device provided with the...

Details Fresnel lens and an illuminating device provided with the... Fresnel lens and an illuminating device provided with the...

2007-07-31

2007-07-31

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With multipart element

C359S743000

Reexamination Certificate

active

10900313

ABSTRACT:
A refractive Fresnel lens part is provided on an upper surface of a plate-like lens at a central portion. A reflective Fresnel lens part is provided on a lower surface of the plate-like lens at a peripheral portion.

REFERENCES:
patent: 4936657 (1990-06-01), Tejima et al.
patent: 62276502 (1987-12-01), None
patent: 05164906 (1993-06-01), None

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