Spread illuminating apparatus with an optical path conversion means
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United States of America Patent
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-
Dec 17, 2002
Grant Date -
N/A
app pub date -
Jun 30, 2000
filing date -
Jul 26, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A spread illuminating apparatus, in which a bar-like light conductive member brightened by a light emitting diode disposed at an end thereof is disposed close to the side of a transparent substrate made of light-permeable materials. The light conductive member is provided with a row of prism grooves as an optical path conversion means and an optical path conversion plate is disposed between the light conductive member and the transparent substrate. Light from the light emitting diode enters the light conductive member and is directed slantingly at the prism grooves to enter the optical path conversion means. Then, the light enters the transparent substrate straight to illuminate it efficiently.
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