04528444 is referenced by 173 patents and cites 7 patents.

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.

Title
Optical reading apparatus with automatic gain control circuit
Application Number
6/436822
Publication Number
4528444
Application Date
October 26, 1982
Publication Date
July 9, 1985
Inventor
Toshiyasu Sakai
Kariya
JP
Masahiro Hara
Kariya
JP
Agent
Cushman Darby & Cushman
Assignee
Nippondenso
JP
IPC
G06K 7/10
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