Registers – Coded record sensors – Particular sensor structure
Patent
1990-01-05
1992-05-19
Levy, Stuart S.
Registers
Coded record sensors
Particular sensor structure
235466, 235470, G06K 710
Patent
active
051151219
ABSTRACT:
There is provided, in one preferred embodiment, a bar code reader which has a variable scan angle, with the amplitude of the scan angle initially being relatively small and then increasing in magnitude until a bar code is read. As the amplitude of the scan angle increases, the scan frequency is decreased, thereby keeping the scan rate across the bar code relatively constant. Consequently, for example, a high-density bar code may be read at either a close distance or a far distance without sacrificing resolution. Additionally, the reading of a selected bar code in the presence of other, closely-spaced bar codes is facilitated. In another preferred embodiment, the scan frequency is held constant and the clock rate in the bar code reader is increased with increasing amplitude of the scanning angle. In yet another preferred embodiment, scan angle and frequency are held constant, while a microprocessor varies the length of the bar code decoded and increases/decreases resolution to compensate for the distance of the bar code from the reader head.
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Bianco James S.
Drummond Bernard
Control Module Inc.
Crozier John H.
Glembocki Christopher R.
Levy Stuart S.
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