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OPTICAL WAVEGUIDE, SURFACE LIGHT SOURCE APPARATUS, TRANSMISSION TYPE IMAGE DISPLAY APPARATUS, METHOD OF DESIGNING LIGHT DISTRIBUTION PATTERN FOR OPTICAL WAVEGUIDE, AND METHOD OF MANUFACTURING OPTICAL WAVEGUIDE
OPTICAL WAVEGUIDE, SURFACE LIGHT SOURCE APPARATUS, TRANSMISSION TYPE IMAGE DISPLAY APPARATUS, METHOD OF DESIGNING LIGHT DISTRIBUTION PATTERN FOR OPTICAL WAVEGUIDE, AND METHOD OF MANUFACTURING OPTICAL WAVEGUIDE
PURPOSE: A manufacturing method of light guide plates is provided to reduce the brightness smudge placing around a light incoming unit in which the light is incoming. CONSTITUTION: A light guide plate member(11) has four sides(S31-S34) intersecting in an exit side(S1), a rear side(S2) of an opposite side of the exit side, and the exit side and the rear side. The four sides S31~S34 are figured by orthogonally crossing the exit side and the rear side. In the rear side of the light guide plate member a plurality of light reflection dot(12) is formed. In order to exit the light of a uniform plane shape from the exit side efficiently, the light reflection dot is small in an incoming light unit side close to a light source(3) and gets bigger as the light reflection dot goes further from the light source. The light reflection dot is formed in a virtual grid regularly arranged in two dimension through a front side of the rear side.
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