Invention Grant
US07866844B2 Emission device, surface light source device and display 有权
排放装置,表面光源装置和显示屏

Emission device, surface light source device and display
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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