Light deflection element and light source apparatus using the same
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United States of America Patent
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-
Jul 22, 2008
Grant Date -
Nov 9, 2006
app pub date -
Jul 13, 2006
filing date -
Jan 31, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A surface light source apparatus includes a primary light source (1), an optical guide (3) for guiding light emitted from the primary light source and having a light incoming surface (31) and a light outgoing surface (32), a light deflection element (4) arranged adjacent to the light outgoing surface of the optical guide and having a light incoming surface (41) and a light outgoing surface (42), and a light diffusion element (6) arranged adjacent to the light outgoing surface of the light deflection element. The light incoming surface (41) of the light deflection element has a plurality of prism strings arranged substantially parallel to each other and each having two prism surfaces. At least one of the prism surfaces of these prism strings has a prism surface consisting of at least two planes having different inclination angles. As the plane approaches the light going surface, the inclination becomes larger.
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