Planar light source device
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United States of America Patent
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-
Dec 7, 2004
Issued Date -
N/A
app pub date -
Mar 11, 2002
filing date -
Jul 11, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A planar light source device including a light guide pipe with one surface thereof serving as a light radiation surface, a light extracting mechanism provided to the light guide pipe, a light source provided to a side edge portion of the light guide pipe, and a light reflection sheet arranged to an opposite surface side from the light radiation surface of the light guide pipe such that the light extracting mechanism serves as a mechanism for radiating out, toward the light reflection sheet side, at least 65% or more of light beams radiated out from the light guide pipe, and the light reflection sheet is formed with an arrangement of multiple substantially identical and/or substantially similar base units composed of sloped reflection surfaces at a pitch of 5000 .mu.m or less.
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