| 摘要 |
The object of the invention is to provide an easily producible light diffusing sheet which is rich in the amount of entering light from one side, can emit uniform diffused light with no variation of brightness from the opposite side by controlling optical loss at a small degree, and does not generate wrinkles when heated by light and heat from the light source. The invention is a sheet (1) comprising a light-transmittable resin, in which irregularities are formed on both sides (1a) and (1b) of the sheet, the average surface roughness of one side (1a) which becomes the light-entering side is larger than the average surface roughness of the opposite side (1b) that becomes the light-departing side, and the surface area ratio of said one side (1a) is smaller than the surface area ratio of said opposite side (1b), which is a light diffusing sheet wherein the average surface roughness of said one side (1a) is from 0.2 to 5.0 mum and the average surface roughness of said opposite side (1b) is from 0.2 to 2.0 mum. A light diffusing agent having a mean particle diameter of from 0.5 to 50 mum may be contained in the light-transmittable resin in an amount of from 0.1 to 50% by weight.
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