Surface light source device of side light type having diffusing

Details Surface light source device of side light type having diffusing Surface light source device of side light type having diffusing

1996-03-27

1999-07-13

Tso, Laura

Illumination

Revolving

362 26, F21V 800

Patent

active

059216514

ABSTRACT:
A dot pattern of a light guide plate is optimally designed for a surface light source device of side light type. A lamp 1 is disposed at the side of the light guide plate 2 and light introduced from a light incidence surface into the light guide plate 2 is emitted from a luminous surface. The dot pattern is arranged on the rear surface of the light guide plate 2 according to the following principles: (1) there is a (gradient) portion where the rate of area occupation of the dot pattern increases from a region (usually a far region) lowly exposable to light from the lamp 1; and (2) there is no sharp variation in the rate of area occupation of the dot pattern. At a corner of the light guide plate 2, a substantially triangular dot pattern is disposed for compensating any luminance drop due to the location in the vicinity of an electrode portion 1a of the lamp 1.

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