Bar code reader with compensation for signal variation on differ

Details Bar code reader with compensation for signal variation on differ Bar code reader with compensation for signal variation on differ

1986-09-30

1988-12-20

Pellinen, A. D.

Registers

Coded record sensors

Particular sensor structure

235454, 235462, G06K 714

Patent

active

047926660

ABSTRACT:
A method and apparatus for obtaining a more uniform output signal strength among various scan lines of a multiple scan line laser bar code reader involves switching of the gain level in the return signal amplifier of the bar code reader apparatus, in accordance with the position of the laser beam in the scanning sequence and in accordance with known information relating to the relative response that can be expected from each different scan line. This enables a better uniformity in signals from the reading of bar codes, regardless of which scan line was used to read the code, by compensating for inevitable variations in return signal strength on different scan lines, particularly in a shallow-profile slot scanner.

REFERENCES:
patent: 3891829 (1975-06-01), Dobea
patent: 4289957 (1981-09-01), Neyroud et al.
patent: 4409469 (1983-10-01), Yasuda et al.

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