Hollow type planar illuminating device
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United States of America Patent
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Jul 19, 2011
Grant Date -
Aug 19, 2010
app pub date -
Oct 7, 2008
filing date -
Oct 12, 2007
priority date (Note) -
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Abstract
A hollow type planar illuminating device having uniform luminance distribution over the entire light emitting is described. A reflecting surface member is arranged on the bottom side of a hollow unit case, a light emitting surface member is arranged on the side facing the reflecting surface member of the unit case, and a space sandwiched between the reflecting surface member and the light emitting surface member of the unit case forms a hollow light guide space. An LED light source unit emits light into the hollow light guide space with a light collecting lens arranged between the LED light source unit and an end surface of the hollow light guide space. The light collecting lens reduces the directivity angle of light emitted from the LED light source unit in the device thickness direction.
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