Flat light source with U-shaped configuration

Details Flat light source with U-shaped configuration Flat light source with U-shaped configuration

1999-05-12

2000-03-21

O'Shea, Sandra

Illumination

Revolving

362 26, 349 67, G01D 1128, G02F 11335

Patent

active

060394528

ABSTRACT:
A flat light source with U-shaped configuration is proposed which can provide substantially uniform surface illumination. The flat light source includes a first transparent portion for use for illumination which may be composed of a first substantially flat light transmission means, a second transparent portion for use as bypass light guide which may be composed of a second substantially flat light transmission means, and a light coupling portion for use as light coupling between said first and second transparent portions, which may have at least one optical prism. The first and second transparent portions which may be positioned substantially parallel each other form a first and second substantially linear cross sections of a substantially U-shaped configuration. The light coupling portion which is positioned near a bottom between said first and second transparent portions forms a substantially bent (or non-linear) cross section of the U-shaped configuration. Thereby the flat light source composed of the first transparent portion, the second transparent portion and the light coupling portion forms the U-shaped configuration as a whole.

REFERENCES:
patent: 5410454 (1995-04-01), Murase

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