Directional diffuser

Details Directional diffuser Directional diffuser

2005-09-06

2005-09-06

Sikder, Mohammad (Department: 2872)

Optical: systems and elements

Methods

C359S599000, C359S598000

Reexamination Certificate

active

06940665

ABSTRACT:
A diffuser is disclosed which transmits or reflects incident light into a specific range of angles. In a preferred embodiment, this light is uniformly scattered throughout a cone of angles. The diffuser consists of two parts. The first part diffracts or reflects light into a specific offset angle. The second part, in the preferred embodiment, uniformly scatters the light through a range of angles, which is centered on the offset angle. The diffusers have utility in applications such as screens for wrist watches, computers, calculators, and cell phones.

REFERENCES:
patent: 4298249 (1981-11-01), Gloor et al.
patent: 5004673 (1991-04-01), Vlannes
patent: 5771328 (1998-06-01), Wortman et al.
patent: 6081376 (2000-06-01), Hansen et al.
patent: 6348995 (2002-02-01), Hansen et al.
patent: 6400509 (2002-06-01), Sappey et al.

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