| 摘要 |
A surface light source device comprises a light guide plate having an emission face and, opposite with the emission face, a back face which is provided with a great number of micro-reflectors, for example, shaped like pyramids and a fine-unevenness surface is formed among the micro-reflectors. The light guide plate has an incidence face through which an illumination light is introduced into the light guide plate to be then being emitted from the emission face with the help of the micro-reflectors and the fine-unevenness surface. Each micro-reflector has at least a pair of slopes which meet each other as to form a ridge that gets closer with an increasing distance from the incidence face. A large part of an inner propagation light is inner-reflected twice by the slopes successively and direction-converted as to be directed to the emission face. The fine-unevenness surface formed among the micro-reflectors has a characteristic adjusting function that additionally adjusts characteristics such as uniformity of brightness which would be insufficient if otherwise only micro-reflectors are formed. The illumination light emitted from the emission face is supplied to an object such as a liquid crystal display panel.
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