Surface light source device

Details Surface light source device Surface light source device

1996-12-09

1999-10-05

Tso, Laura K.

Illumination

Revolving

362558, F21V 800

Patent

active

059611979

ABSTRACT:
A wedge-shaped light scattering guide plate 10 employed in a surface light source device of side-light type has a width equal to the length of a primary light source element. An incidence end surface 11 is formed as a matte surface (rough surface) by a matting process. The incidence end surface 11 is provided with roughness which is uniform or increases toward end portions. The roughened incidence end surface 11 produces scattered light in the vicinity of the incidence end surface, especially at both side end portions. The scattered light contributes to elimination of variation in luminance which tends to occur in the vicinity of the incidence end surface 11. A light diffusing plate may be interposed between the primary light source element and the light scattering guide plate.

REFERENCES:
patent: 4277817 (1981-07-01), Hehr
patent: 4714983 (1987-12-01), Lang
patent: 5178447 (1993-01-01), Murase et al.
patent: 5289351 (1994-02-01), Kashima et al.
patent: 5410454 (1995-04-01), Murase et al.
patent: 5709447 (1998-01-01), Murakami et al.
patent: 5772305 (1998-06-01), Ishikawa et al.
U.S. application No. 08/289,316, Ishikawa, filed Aug. 11, 1994.

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