Optical reading apparatus with automatic gain control circuit
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United States of America Patent
Stats
-
Jul 9, 1985
Grant Date -
N/A
app pub date -
Oct 26, 1982
filing date -
Oct 30, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an optical reading apparatus having a reading sensor for converting optically readable information into an electrical analog signal, an automatic gain control circuit is provided to maintain the amplitude of the electrical signal constant. The gain of the automatic gain control circuit is controlled such that the average or peak voltage of the electrical signal derived from the reading sensor is detected and held until next scanning effected by the reading sensor so that a variable impedance element included in the automatic gain control circuit will be controlled in accordance with the held voltage to maintain the amplitude of the electrical signal constant.
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