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Lighting

Surface-light-emitting-device

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Surface light emitting device

Details

Inventors: Ehara, Munetsugu; Nojiri, Hitoshi; Nakanishi, Eiji; Kunikata, Koichi;
Assignee: Nichia Corporation (Anan, JP)
Primary Examiner: Tso; Laura K.
Assistant Examiner:
Attorney, Agent or Firm: Morrison & Foerster LLP

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.

DETAILED DESCRIPTION An object of the present invention is to solve the problems described above and provide a surface light emitting device that is capable of emitting light of high luminance with higher uniformity.
The inventors of the present application conducted various experiments and researches and found that light incident on an end face of a light guide plate can be diffused more uniformly in a light guide plate by forming a light diffusing portion of a predetermined configuration on the end face of the light guide plate, thus completing the present invention.
The surface light emitting device of the present invention comprises a light guide plate having a top surface and an under surface that oppose each other, a reflector installed on the under surface of the light guide plate and an LED light source that comprises at least one LED element so that light emitted by the LED element is incident on one end face of the light guide plate, thereby to cause the light to emerge from the top surface of the light guide plate, characterized in that: the light guide plate has such a light diffusing portion on the one end face described above, that the 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 formed to be space from the top surface at the one end.
In the surface light emitting device made in such a configuration as described above, since the light diffusing portion is formed to be space from the top surface of the light guide plate at the one end of the light guide plate so that an opening is not formed on the top surface of the light guide plate, light is prevented from leaking through the top surface of the light guide plate and uniform surface light emission without abnormal light emission can be achieved.
The top surface f the light guide plate refers to the surface through which the light is emitted, and the under surface refers to the surface opposite to the light emitting surface

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