PRISM PLATE, ILLUMINATION OPTICAL SYSTEM OF IMAGING DEVICE, AND FORMING DIE OF PRISM PLATE
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United States of America Patent
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app pub date -
Mar 30, 2012
filing date -
Oct 30, 2009
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Abstract
A prism plate is obtained which gives directivity to the exit directions of illumination light and enables control of the illuminance distribution. A prism plate 11 includes a prism surface 12 on which a prism array in the shape of a triangular pole having multiple ridgelines 13 is formed, and in which minute bumps and dips 14 are formed on the prism surface 12.
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