Fresnel optical element and projection display apparatus

Details Fresnel optical element and projection display apparatus Fresnel optical element and projection display apparatus

2007-05-23

2010-06-29

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

With multipart element

C359S743000

Reexamination Certificate

active

07746570

ABSTRACT:
Each of a plurality of Fresnel prisms12is formed so that a refractive surface12thereof includes a non-light incidence surface12cupon which any light ray emitted from a projector1is not directly incident because it is intercepted by another Fresnel prism12, the non-light incidence surface having an angle τ′ with a reflective surface12bwhich is different from the prism apex angle τ of each of the plurality of Fresnel prisms. As a result, a light ray reflected by the refractive surface12aof each of the plurality of Fresnel prisms without passing through the refractive surface can be preventing from emerging, as unnecessary light, toward the viewer's line of sight.

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