| 摘要 |
PURPOSE: To provide a condensing film capable of condensing incident light from various directions to a definite direction as much as possible and emitting it and usable only by one sheet. CONSTITUTION: The condensing film consists of a prism part 8b comprising a film base 8a composed of a transparent resin and equilateral triangular pyramids with 102-115deg. apex angle continuously located on the surface of the film base 8a.
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