| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of designing a diffusion plate with which a light beam emitting from a light source can be efficiently used and an uniform illuminating face can be maintained responding even to a linear light source having a complicated form. SOLUTION: The method of designing a diffusion plate which diffuses and emits light beams from a light source includes a step S4 of detecting the luminance in the plane to detect the luminance in the plane of the diffusion plate as a plurality of luminance data assigned in a matrix on the diffusion plate, a step S6 of transforming the data to transform the plurality of luminance data into a plurality of thickness data of the diffusion plate, and a step S7 for diffusion plate form to determine the form of the diffusion plate based on the transformed thickness data.
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