Low powered high ambient light bar code reader circuit

Details Low powered high ambient light bar code reader circuit Low powered high ambient light bar code reader circuit

1985-03-07

1987-07-21

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

235454, G06K 710

Patent

active

046820159

ABSTRACT:
A low power bar code detection circuit is provided. The detection circuit, because of the sensitivity of its internal amplifiers, is capable of reading reflected bar code images even in high ambient light, for example, in sunlight. This sensitivity is accomplished by having a high gain of the photodetected bar code signal by amplifying it with a transresistance preamplifier. The low power is accomplished by using a pulse-modulated light source for producing reflected images and having intermediate amplifier stages of the detection circuit conduct only at the peak amplitudes of the detected image signal.

REFERENCES:
patent: 3925639 (1975-12-01), Hester
patent: 3947817 (1976-03-01), Reqna
patent: 3991299 (1976-11-01), Chadima

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