Surface light source device, illumination unit and light...

Details Surface light source device, illumination unit and light... Surface light source device, illumination unit and light...

2005-07-18

2008-11-04

Ward, John A (Department: 2885)

Illumination

Edge lighted panel

Light guide

C362S624000

Reexamination Certificate

active

07445370

ABSTRACT:
At least one LED emits light received by a light flux control member and subsequently emitted from an emission race thereof. Each LED is in a recess formed in the light flux control member and configured to satisfy the following conditions, for at least light emitted toward within a half-intensity-angular-range from the corresponding LED, where θ1is the emission angle of any light emitted from the emission face of the light flux control member: (1) θ5/θ1>1, except for light emitted toward within an angular-neighborhood of a normal direction with respect to the emission face; and (2) θ5/θ1decreases gradually as θ1increases. If a plurality of LED's are employed, differences in emitting color among individual LED's are made less conspicuous and uniform illumination free from uneven brightness is realizable.

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European Search Report, Application No. 05 25 4407, mailed Oct. 26, 2005.

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