Liquid crystal cells – elements and systems – Particular structure – Particular illumination
Patent
1997-06-18
1999-06-22
Bovernick, Rodney
Liquid crystal cells, elements and systems
Particular structure
Particular illumination
349 62, 349 95, 362 31, 362331, 362339, G02F 11335, F21V 704, F21V 500, F21V 502
Patent
active
059147601
ABSTRACT:
A surface light source device includes a light source, a light guide plate for guiding light from the light source to one surface, and a light-condensing member for outputting exit light from the light guide plate in a predetermined direction. The one surface of the light guide plate is a stepped surface whose thickness decreases step by step at a predetermined pitch from one end, at which the light source is arranged, to the other. The light-condensing member is located to face the light guide plate and includes a plurality of prisms for refracting exit light from the light guide plate toward the direction of a normal to the light guide plate, and a plurality of lenses for condensing and outputting light in a direction within a predetermined range of angles.
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Anonymous: "Lens-Prism Optical System" Research Disclosure, No. 112, Aug. 1973.
Bovernick Rodney
Casio Computer Co. Ltd.
Chowdhury Tarifur R.
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