Emission device, surface light source device and display

Details Emission device, surface light source device and display Emission device, surface light source device and display

2011-01-11

2011-01-11

Alavi, Ali (Department: 2875)

Illumination

Plural light sources

With modifier

C362S217020, C362S246000, C362S326000

Reexamination Certificate

active

07866844

ABSTRACT:
A light flux control member has a back face provided with a first recess portion and ventilation grooves. Output light of the light emitting element arranged as to correspond to the first recess portion enters into the light flux control member via the first recess portion and ventilation grooves being emitted from a light control emission face of the light flux control member after inner-propagation. Refraction of incident light to second recess portions formed in the ventilation grooves hardly generate inner-propagation light which has travelling directions near to a direction of reference optical axis L. This avoids emission from the light control emission face from providing a ring-like bright part. In addition, heat emitted from the light emitting element can be released at a high efficiency because a space in the first recess portion communicates with the outside of the light flux control member.

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European Search Report mailed Aug. 3, 2009 and issued in corresponding European Patent Application 09154278.7.

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