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

1996-02-01

1998-09-22

Cariaso, Alan

Illumination

Revolving

362327, 362330, 362331, 349 65, 385146, F21V 800

Patent

active

058104640

ABSTRACT:
A surface light source device of side light type controls the intensity of light rays emitted therefrom. The surface light source device of side light type comprises a light scattering guide 20 having a light incidence surface 22, a light emission surface 23 and an inclined surface 25. The device further includes a primary light source L arranged around one side of the light incidence surface 22, a silver foil R surrounding the primary light source L, a prism sheet 4 arranged along the light emission surface 23, and a silver foil S arranged along the inclined surface 25. The inclined surface 25 of the light scattering guide 20 composed of three sections I, II and III. The section I is a convex cylindrical surface section having a radius of curvature of 330 mm. The tangential direction at the end of the guide on the side of the light incidence surface 22 is parallel to the light emission surface 23. The tangential direction at the boundary between the sections I and II is inclined at an angle 4.degree. with respect to the light emission surface 23. The sections II and III are straight sections whose inclinations are 4.degree. and 3.6.degree. with respect to the light emission surface 23, respectively. The distribution of emitted light intensity from the surface light source device has a higher luminance around its center. Various distributions of emitted light intensity are provided by varying the transition of inclinations of the inclined surface (particularly refer to FIG. 13).

REFERENCES:
patent: 4909604 (1990-03-01), Kobayashi et al.
patent: 4914553 (1990-04-01), Hamada et al.
patent: 5271077 (1993-12-01), Brockman et al.
patent: 5303322 (1994-04-01), Winston et al.
patent: 5402324 (1995-03-01), Yokoyama et al.
patent: 5575549 (1996-11-01), Ishikawa et al.
English language Abstract & Japanese Patent No. 2-13925, of Hidesuke Endo, issued Jan. 18, 1990.
English language Abstract & Japanese Patent No. 2-221924, of Hidetoshi Innami, issued Sep. 4, 1990.
English language Abstract & Japanese Patent No. 2-221925, of Hidetoshi Innami, issued Sep. 4, 1990.
English language Abstract & Japanese Patent No. 2-221926, of Hidetoshi Innami, issued Sep. 4, 1990.
English language Abstract & Japanese Patent No. 2-245787, of Takeshi Saito, issued Oct. 1, 1990.

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