Light guide member, illumination device, and image reading apparatus using them
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United States of America Patent
Stats
-
May 15, 2001
Grant Date -
N/A
app pub date -
Jul 8, 1999
filing date -
Jul 10, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A light guide member includes a columnar light transmission member having an end face as a light incident surface, a light emergent surface on part of a side surface of the columnar light transmission member, and a saw-toothed reflection portion on a surface opposing the light emergent surface. The saw-toothed reflection portion is made up of a plurality of reflection surfaces. An angle of a reflection surface farther away from the light incident surface with respect to a longitudinal direction of the light guide member is larger than an angle of a reflection surface closer to the light incident surface with respect to the longitudinal direction.
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