Surface light source device, image display and light control...

Details Surface light source device, image display and light control... Surface light source device, image display and light control...

2007-10-23

2007-10-23

O'Shea, Sandra (Department: 2875)

Illumination

Light modifier

Refractor

C362S244000, C362S329000, C362S330000, C362S606000

Reexamination Certificate

active

10900319

ABSTRACT:
Primary light is directed to a light path control plate from at least one point-like light source. The light path control plate has an inner face on which projection-like transmission-reflection portions and curved-for-refraction portions are alternately formed along a leaving-direction from an optical axis direction of the point-like light source, wherein each transmission-reflection portion is composed of a transmission face permitting primary light to transmit through the transmission face and a reflection face which reflects the transmitted light as to bring changed light paths directed to an outer face of the light path control plate while each curved-for-refraction portion refracts primary light as to bring changed light paths directed to the outer face of the light path control plate. First light reaching the outer face via the transmission-reflection portions and second light reaching the outer face via the curved-for-refraction portions are generated from primary light. The first light and second light are emitted from the outer face. A plurality of sections each of which is equivalent to the above light path control plate may be formed on substrate for providing illumination for a large screen display.

REFERENCES:
patent: 4120018 (1978-10-01), Nagel
patent: 6450661 (2002-09-01), Okumura
patent: 2003/0223249 (2003-12-01), Lee et al.
patent: 2005/0030730 (2005-02-01), Ohkawa et al.
patent: 06-104489 (1994-04-01), None

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