| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an optical deflection element which is narrowly controlled in exit light distribution, can be improved in utilization efficiency of light quantity of a primary light source (that is, emission efficiency of light intensively emitted from the primary light source in a required observation direction becomes high) and in which optical defect hardly occurs, and to provide a light source apparatus having the optical deflection element. <P>SOLUTION: The optical deflection element includes a light incident surface where light is made incident and a light emission surface which is located at the opposite side of the light incident surface and from which incident light is emitted. At the light incident surface, a plurality of prism rows each comprising two prism faces are arranged about in parallel to each other. Among the prism faces, a first prism face which is located near a light source side is constituted of two planes having different tilt angles toward the light incident surface and a second prism face which is located remote from the light source side is constituted of two or more planes having different tilt angles toward the light incident surface. Further to the light emission surface, minute shapes are provided correspondingly to respective prism rows. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
