Communications: electrical – Digital comparator systems
Patent
1978-05-31
1981-02-17
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
235462, 235472, 250568, 3401463F, 350 66, 350 67, G06K 924
Patent
active
042517982
ABSTRACT:
Laser light reflected from a bar code symbol pattern is detected by a photodetector mounted in a portable scanning head of a laser scanning system. By selecting appropriate threshold values on the analog signal generated by the photodetector, the analog signal is converted to a series of pulses, each pulse width accurately corresponding to the width of a bar from the scanned pattern. A plurality of functions can be determined from the series of pulses, each function being independently selected by keyboard entry from the head, displayed on the head, and/or recorded by a printer remote from the head. Single line or multiple line scans in two orthogonal directions relative to the pattern may be selected. A bimorph or speaker-type oscillatory element may be utilized as a miniature scanning element. Circuitry for synchronizing scanning along both axes, and for generating a signal to drive the bimorph in a uniform, constant velocity manner is also disclosed.
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Barkan Edward
Brown George
Delfine Frank
Harrison Shelley A.
Swartz Jerome
Boudreau Leo H.
Symbol Technologies
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