Spread illuminating apparatus with a pair of light sources overlapped in a thickness direction of a transparent substrate
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United States of America Patent
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-
May 13, 2003
Grant Date -
May 2, 2002
app pub date -
Nov 1, 2001
filing date -
Nov 2, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is provided a spread illuminating apparatus realizing both uniform light emission and high brightness. Two bar-like light conductive members made of a transparent material and each having a spot-like light source disposed on a large end thereof are disposed so as to overlap with each other in the thickness direction of a transparent substrate, thereby constituting a pair of bar-like light sources. Light emitted from the spot-like light source and entering one light conductive member of the two is directly guided into the transparent substrate without passing through the other light conductive member. Thus, light rays emitted from the two light conductive members do not interfere with each other so as to prevent generation of interference fringes, resulting in that uniform light emission and high brightness in the spread illuminating apparatus can be realized.
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