To provide a plane light source device with downsizing aimed at by heightening a ratio of an effective region, and with light more evenly emitted through reduction of luminance unevenness in the effective region.
The plane light source device is provided with a light-emitting portion 1 containing at least one point light source, and a light guide plate 2 equipped with an incident side face 2A into which light from the point light source is incident in opposition to the light-emitting portion 1 and a main emission face 2B from which the incident light is emitted. It is further provided with a reflecting member 3 arranged from an above portion of an end part of the main emission face 2B at an incident face side over to an above part of the light-emitting portion 1 and a reflecting member 4 arranged from a lower part of the face opposite to the main emission face 2B over to a lower portion of the light-emitting portion 1, and a non-diffusive, light-transmitting members 5, 6 arranged between the reflecting members 3, 4 and the light guide plate 2.
SHIROYAMA YASUHISA
KOYANAGI TOMOHIRO
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai
Nobuo Arakawa
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