Registers – Coded record sensors – Particular sensor structure
Patent
1993-03-08
1995-04-18
Sheppard, John
Registers
Coded record sensors
Particular sensor structure
G06K 710
Patent
active
054080819
ABSTRACT:
A circuit for digitizing an analog electric signal generated from a photoelectronic conversion of reflected light when scanning indicia having spatially-separated, light-reflective portions includes a differentiator circuit for generating a first derivative signal representing a first derivative of the analog signal. A comparison signal generating circuit generates a comparison signal and an output circuit, coupled to the differentiator circuit and to the signal generating circuit, compares the first derivative signal and the comparison signal to generate an output signal indicating a change in the intensity of the reflected light. An output controller, coupled to the output means, controls passage of the digital output signal.
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Sheppard John
Symbol Technologies Inc.
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