| 摘要 |
PROBLEM TO BE SOLVED: To realize a method for evaluating quality of a diffusion plate whereby the quality of the diffusion plate can be inspected at a good reproducibility, without the personal judgment. SOLUTION: A light from a surface light source 1 irradiates the diffusion plate 3 through a pattern mask 2, the diffusion plate 3 is photographed by a camera 4, and the degree of dispersion of the pixel outputs of the taken image is calculated and processed to evaluate the quality of the diffusion plate, based on the degree of dispersion thereof.
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