| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical sheet which secures expected output light characteristics or output light characteristics approximating the expected output light characteristics. <P>SOLUTION: The optical sheet 30 includes a body part 32 and a plurality of unit prisms 35 which are arrayed on one surface 32a of the body part and linearly extend in a direction crossing the array direction. Each unit prism is made of an ionizing radiation curable resin and includes at least one plane. An angular distribution of brightness which is measured on the other surface of the body part in a state, wherein a luminous flux traveling in parallel with a normal direction of the body part is made incident on the planes of unit prisms, and is shown on a graph having the vertical axis representing brightness and the horizontal axis representing measured angles satisfies a prescribed condition. <P>COPYRIGHT: (C)2011,JPO&INPIT |
