| 摘要 |
PROBLEM TO BE SOLVED: To improve light diffusion property in a speaker using a light diffusion sheet as a diaphragm. SOLUTION: Since a light diffusion pattern of the diaphragm 18 is a light diffusion pattern in which filled and fine pyramids 26a, 26b are alternately and adjacently disposed, when light is emitted from a multi-color LED 17 on a rear side of the diaphragm 18, made incident to the diaphragm 18, transmitted therethrough and radiated from side surfaces of the pyramids 26a, 26b, not only the light is diffused sufficiently by lens operation of the light diffusion pattern (pyramids 26a, 26b) but also the light radiated from the side surfaces of the pyramids 26a, 26b is made incident to the adjacent pyramids 26a, 26b and reflected or refracted there, so that the effect is presented where a course of light radiated finally becomes extremely random and light diffusion property is improved. COPYRIGHT: (C)2009,JPO&INPIT
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