Flat panel lens

Details Flat panel lens Flat panel lens

2011-07-12

2011-07-12

Husar, Stephen F (Department: 2875)

Illumination

Edge lighted panel

Light modifier for edge lit light source

C362S026000, C362S615000, C362S616000, C362S617000, C362S628000, C385S901000

Reexamination Certificate

active

07976208

ABSTRACT:
A light guide with input and output faces2, 3ais polar-symmetric about the first face2and has optical properties such that the angle at which a ray is injected into the first face determines the position at which it leaves the second face3a, or, if operated in the reverse direction, the position at which the ray enters the second face determines the angle at which the ray leaves the second face. The light guide includes a tapered transparent sheet3, light from the first face entering at the thick end of this sheet, and the second face forming one face of the tapered sheet. An input/output slab4adjoins the tapered sheet3for fan-out of light from the first face2to the tapered sheet, and a transition region8is located between flat and tapered sheets. The polar symmetry means that light rays always travel in line with the taper direction, which suppresses banding. Preferably the light guide further includes a prism device20for folding the light so that the flat and tapered sheets can be folded over each other. A method of making such a prism is also disclosed.

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