Apparatus and method for recognizing optical information
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United States of America Patent
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-
Mar 29, 1988
Grant Date -
N/A
app pub date -
Feb 12, 1986
filing date -
Feb 19, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus and method for recognizing optical information such as bar code has a light source and an image sensor which converts intensity of light reflected by the optical information into an electric image signal. The electric image signal is sample-and-held to detect the average intensity of light from the light source. The time interval for activating the light source is pulse width modulated in accordance with the detected average intensity in a previous operational cycle.
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