Optical information reading apparatus having dust-proof plate
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United States of America Patent
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Mar 21, 2000
Grant Date -
N/A
app pub date -
Oct 21, 1998
filing date -
Oct 27, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A dust-proof plate transmits light emitted by red light emitting diode unit. When the dust-proof plate reflects a part of the light, the reflected light incident on an image forming optical system becomes an optical noise in reading the image information of a reading object. In order to prevent the optical noise from being generated, an incident-side opening of a lens barrel is positioned proximately to the dust-proof plate. Thus, the light reflected from the dust-proof plate can be prevented from being introduced into the lens barrel.
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