Bar code reading apparatus
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United States of America Patent
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Jun 29, 1999
Grant Date -
N/A
app pub date -
Mar 3, 1997
filing date -
Mar 4, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a bar code reading apparatus that is useful for recognizing by human eyes whether a light beam is being projected onto a bar code symbol. The bar code reading apparatus contains a first and second light source to radiate a first ray and a second visible ray, respectively. The second visible ray has higher visibility than first light beam for human eyes. As a result, an operator can easily recognize whether the light beams are projected onto a bar code symbol. Another bar code reading apparatus contains first and second photo detectors for receiving a first and a second reflected beam, respectively. With this arrangement two different bar code symbols can be simultaneously read by the bar code reading apparatus.
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