Bar code scanner system and scanner circuitry therefor

Details Bar code scanner system and scanner circuitry therefor Bar code scanner system and scanner circuitry therefor

1988-10-12

1990-11-13

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

235455, 235462, 235472, 250568, G06K 714

Patent

active

049703790

ABSTRACT:
In an exemplary wand type bar code scanner the scanner circuit includes a first control loop for reducing the LED driving current as the D.C. voltage level supplied to the digitizer tends to exceed a selected D.C. reference value; a second control loop becomes active when the LED is shut off by the first control loop, e.g. in the presence of sunlight. The second control loop controls the gain of the scanner amplifier so that the D.C. reference level at the input to the digitizer circuit is maintained as the scanner scans bar codes in the presence of sunlight but with the LED de-energized.

REFERENCES:
patent: 3823388 (1974-07-01), Chadima et al.
patent: 3991299 (1976-11-01), Chadima, Jr. et al.
patent: 4250488 (1981-02-01), Haupt
patent: 4449074 (1984-05-01), Luchaco
patent: 4553081 (1985-11-01), Koenck
patent: 4570057 (1986-02-01), Chadima, Jr. et al.
patent: 4677287 (1987-06-01), Ejima

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