Optical scanning device, illumination device, projection apparatus and optical device
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United States of America Patent
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Dec 26, 2017
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app pub date -
Dec 10, 2014
filing date -
Dec 13, 2013
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Abstract
An illumination device includes a diffusion member having an anisotropic diffusion surface, a rotary shaft member configured to rotate the anisotropic diffusion surface while a coherent light beam from a light source is illuminated on the anisotropic diffusion surface, and an optical device that further diffuses a coherent light beam diffused on the anisotropic diffusion surface, wherein the coherent light beam diffused on the anisotropic diffusion surface is diffused in a form of line and the diffused coherent light beam in the form of line is configured to move to draw a locus of rotation in one direction in accordance with the rotation of the anisotropic diffusion surface.
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