Illumination – Revolving
Patent
1995-12-20
1998-11-10
Sember, Thomas M.
Illumination
Revolving
362330, 362331, 362339, F21V 502
Patent
active
058333444
ABSTRACT:
A method of generating a dual light flux, and a surface light source device for use in a display with a dual preferential viewing direction. Light of a fluorescent lamp is introduced from a light incidence surface to inside of a wedge shape light scattering guide with exiting directivity. While this light is led toward an end surface, it is emitted from a light outgoing surface as an illuminating light flux with exiting directivity to reach a prism sheet as a primary light flux. V-shape grooves giving a prism vertical angle of 90.degree. are formed to face inward and perpendicular to the lamp on the inner surface of the prism sheet, while V-shape grooves giving a prism vertical angle 64.degree. are formed parallel to the lamp on the outer surface of the prism sheet.
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Arai Takayuki
Sasako Hiromi
Enplas Corporation
Sember Thomas M.
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