Light guide, illuminating device having the light guide, and image reading device and information processing apparatus having the illuminating device
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United States of America Patent
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Sep 22, 2009
Grant Date -
Jun 8, 2006
app pub date -
Jan 23, 2006
filing date -
Jan 19, 1993
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In an illumination device, a light guide is adapted to emit the light from a face thereof and is provided with an area, on a face opposite to the light emitting face, for diffusing and/or reflecting the light introduced into the light guide from an end face thereof or is provided with uneven light emitting characteristics along the longitudinal direction of the light guide, and the center of the light source positioned at the end of the light guide is placed at a position aberrated from the normal line to the area, whereby attained are compactness, a low cost, a low electric power consumption, a high efficiency of utilization of the light emitted by the light source, and excellent and uniform illumination characteristics. An image reading device and an information processing apparatus can also be equipped with the above-mentioned illumination device.
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