Optical reading apparatus with automatic gain control circuit

Details Optical reading apparatus with automatic gain control circuit Optical reading apparatus with automatic gain control circuit

1982-10-26

1985-07-09

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

235463, 235472, G06K 710

Patent

active

045284440

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.

REFERENCES:
patent: 3849632 (1974-11-01), Eckert
patent: 3949233 (1976-04-01), Gluck
patent: 3969612 (1976-07-01), McJohnson
patent: 4114030 (1978-09-01), Nojiri et al.
patent: 4219152 (1980-08-01), Couch
patent: 4335301 (1982-06-01), Palmer
patent: 4364513 (1982-12-01), Tsuzuki

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