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Primary Examiner: Stolwein, Walter
Assistant Examiner:
Attorney: Soltow, Jr.; William D., Scribner; Albert W., Vrahotes; Peter

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Title: Hand held bar code reader with constant linear amplifier output

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.

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Inventors: Gluck, Julius (Stamford, CT, US)

Application Number: 497538
Filing Date: 1974-08-15
Publication_date: 1976-04-06
Assignee: Pitney-Bowes, Inc. (Stamford, CT)
Primary Class(es): 250/555 235/462.26, 235/462.45, 250/206, 327/187, 327/312
Other Classes:
US Patent Ref:

3560751	Feb, 1971	Buettner et al.	250/555.
3670202	Jun, 1972	Paine et al.	250/205.
3770967	Nov, 1973	Hanna et al.	250/206.
3813540	May, 1974	Albrecht	250/206.
3820068	Jun, 1974	McMillin	250/568.

Other Refs: Other References: thomas et al., IBM Technical Disclosure Bulletin Vol. 16, No. 8, Jan., 74; pp. 2598-2600.