Symbol read device having separate gain controls for reading dif

Details Symbol read device having separate gain controls for reading dif Symbol read device having separate gain controls for reading dif

1992-08-17

1994-02-22

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

G06K 714

Patent

active

052889831

ABSTRACT:
A symbol read device which has separate gain controls for reading different scan lines. The symbol read device includes a light beam emitter, a scanner which scans the light beam over different positions on a symbol surface having a symbol to be read, a detector which detects light reflected from the symbol surface and generates a detection signal indicative thereof, and a variable gain amplifier which amplifies the detection signal. The device further includes a process which processes an amplified detection signal from the amplifier and recognizes therefrom the symbol being read, an automatic gain controller which sets a gain of the variable gain amplifier every scan line or scan line group in response to the detection signal, a scan position detector which detects a scan position, and a controller which selects the gain set by the automatic gain controller based on an output signal of the scan position detector.

REFERENCES:
patent: 4792666 (1988-12-01), Cherry et al.

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