Flat valley fresnel lens

Details Flat valley fresnel lens Flat valley fresnel lens

2007-08-07

2007-08-07

Perkey, W. B. (Department: 2851)

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

C359S449000, C359S459000, C359S460000, C359S742000, C353S066000, C353S078000

Reexamination Certificate

active

11457117

ABSTRACT:
A Fresnel lens. The Fresnel lens includes an input side configured to receive the image and an output side, opposite the input side, configured to display the image. The input side includes a first facet angled to receive input light constituting at least a portion of the image. The input side also includes a second facet at least partially facing the first facet and a third facet linking the first facet to the second facet, wherein the third facet and the output side are substantially parallel.

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