Surface light source device of side light type

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

1996-03-27

1998-08-04

Sember, Thomas M.

Illumination

Revolving

362 26, 362351, F21V 800

Patent

active

057883564

ABSTRACT:
In a surface light source device of side light type, occurrence of irregularities in luminance is prevented in the vicinity of an incidence surface 10 of a light guide plate 1. A light source element 2 is disposed on a lateral side of the light guide plate 1 and the light introduced into the light guide plate 1 through the incidence surface 10 is emitted through an emission surface 11. The light comes outside after undergoing the action of an additional element 3 (such as a priority traveling direction correcting action) and is applied to, for example, back lighting in a liquid crystal display. A reflection sheet such as a silver foil is disposed along a rear surface 12. The rear surface 12 is treated in various manners in order to reflect the light toward the emission surface 11. Another reflection sheet 20 is disposed as a reflector surrounding the light source element 2 from the back side. A case 4 partially projects inward along the incidence surface 10 to form light shielding walls 8, 9. The shielding walls 8, 9 are adapted to prevent light emitted from the light source element 2 from intruding through gaps G1 to G4 between the elements, or through an end surface of an end edge portion 3a of the additional element.

REFERENCES:
patent: 4903172 (1990-02-01), Schoniger
patent: 5027258 (1991-06-01), Schoniger
patent: 5055978 (1991-10-01), Rogoff
patent: 5146354 (1992-09-01), Plesinger
patent: 5211464 (1993-05-01), Bohmer
patent: 5485354 (1996-01-01), Ciupke et al.
English language abstract & Japanese Laid-Open Patent Application No. 2-17, Jan. 05, 1990, Surface Light Source Element, Makoto OE.

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