Hand held bar code reader with constant linear amplifier output

Details Hand held bar code reader with constant linear amplifier output Hand held bar code reader with constant linear amplifier output

1974-08-15

1976-04-06

Stolwein, Walter

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250206, 235 6111E, 307311, G06K 710

Patent

active

039492338

ABSTRACT:
A linear direct current amplifier with automatic gain control system for regulating the peak-to-peak amplitude of the signal output that is acquired by scanning a coded label with a hand-held photo optical scanner is disclosed. The gain is set primarily by the white background on the coded label and it is further adjusted at the black bar as the pen passes over the label surface on which the code is imprinted. Control circuit feedback compensates for input amplitude and contrast variations.

REFERENCES:
patent: 3560751 (1971-02-01), Buettner et al.
patent: 3670202 (1972-06-01), Paine et al.
patent: 3770967 (1973-11-01), Hanna et al.
patent: 3813540 (1974-05-01), Albrecht
patent: 3820068 (1974-06-01), McMillin
thomas et al., IBM Technical Disclosure Bulletin Vol. 16, No. 8, Jan., 74; pp. 2598-2600.

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