Surface light emitting device
AssigneeNichia Corporation
InventorsMunetsugu Ehara, Hitoshi Nojiri, Eiji Nakanishi, Koichi Kunikata
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Abstract
An surface light emitting device that is capable of emitting light of high luminance with higher uniformity is disclosed. The surface light emitting device comprising; a light guide plate, a reflector on the under surface of the light guide plate and, an LED light source having at least one LED element and provided so that a light emitted by the LED element is incident on at least one end face of the light guide plate, wherein the light guide plate has a light diffusing portion on the one end face so that a light emitted from the LED light source enters the light guide plate while being diffused therein, and the light diffusing portion has the top end being space from the top surface.
Claims29
A surface light emitting device comprising:
- a light guide plate having a top surface for emitting light and an under surface that opposes said top surface;
- a reflector on the under surface of said light guide plate and
- an LED light source comprising at least one LED element and disposed so that light emitted by the LED element is incident on at least one end face of said light guide plate,
- wherein said light guide plate comprises a light diffusing portion on one end face disposed so that light emitted from the LED light source enters the light guide plate while being diffused therein, said light diffusing portion having a top end spaced from the top surface.
A light guide plate for a surface light emitting device comprising:
- a top surface for emitting light,
- an under surface that opposes said top surface,
- at least one end face on the light guide plate positioned between said top surface and said under surface, said end face having a light diffusing portion thereon so that incident light enters the light guide plate and is diffused therein,
- wherein said light diffusing portion has at least one notch expanding in the direction of said under surface.
Dependencies are inferred from the claim text.