| 摘要 |
PURPOSE: A total reflection film is provided, which is composed of an optical transmission conduit whose lightness uniformity is improved without installing inner diffusion plate. CONSTITUTION: A total reflection film comprises: in total reflection film comprising a flat side and another prism side, (i) multiple linear unequal triangle prisms which are arrayed symmetrically by centering around an axis which is perpendicular to the flat side at the nadir of gully that is made by the unequal triangle prism toward the flat side of the total reflection film, wherein an angle made by the long sides is over 90 degree and an angle made by short sides is under 90 degree in the unequal triangle prism and the length of the short side is 0.7-0.99 times the length of the long side.
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