Bar code scanner for a video signal which has a shading waveform

Details Bar code scanner for a video signal which has a shading waveform Bar code scanner for a video signal which has a shading waveform

1986-09-02

1989-01-31

Leung, Philip H.

Registers

Coded record sensors

Particular sensor structure

235463, 235470, 382 53, G06K 710

Patent

active

048017884

ABSTRACT:
A bar code scanner has an image sensor for detecting a bar code and for generating an output signal corresponding to the detected bar code, a sample/hold circuit for sampling, holding, and smoothing an output signal from the image sensor, a slice level determination circuit for determining a slice level in accordance with an output signal from the sample/hold circuit, and a comparator for comparing the output signals from the sample/hold circuit and the slice level determination circuit and for generating a low or high output signal in accordance with a comparison result. The slice level determining circuit has a diode parallel circuit which is formed of a pair of diodes connected in parallel with each other in opposite directions and which has one end connected to the sample/hold circuit, a capacitor connected to the other end of the diode parallel circuit, a voltage transfer circuit for transferring the voltage charged in the capacitor to the comparator, and a discharging circuit for discharging the capacitor in response to the low output signal from the comparator.

REFERENCES:
patent: 4140271 (1979-02-01), Norjiri et al.
patent: 4300164 (1981-11-01), Sacks
patent: 4420742 (1983-12-01), Tadauchi et al.
patent: 4444486 (1984-05-01), Itoh
patent: 4578568 (1986-03-01), Tsuzuki

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