System for recognizing bar code information

Details System for recognizing bar code information System for recognizing bar code information

1977-08-11

1978-06-27

Kilgore, Robert M.

Registers

Coded record sensors

Particular sensor structure

3401463AG, G06K 714, G06K 913, G06K 710

Patent

active

040969924

ABSTRACT:
A bar code having a plurality of parallel bars recorded in either narrow width or wide width is scanned by a plurality of light responsive elements which are driven one by one by a clock pulse of a fixed frequency. The intermittent output image signal of the elements is converted into a continuous signal by sample-and holding the peak level of the image signal at the same frequency as that of the clock pulse. The continuous signal is then compared with a reference value to be converted into a rectangular signal which has time intervals proportional to respective bar widths. For discriminating each bar width, each time interval of the rectangular signal is measured by counting a clock pulse of another fixed frequency and compared with another reference value. The frequency of the clock pulse for interval measuring purpose is determined to be higher than that of the clock pulse for scanning and sample-and-holding purposes.

REFERENCES:
patent: 3599151 (1971-08-01), Harr
patent: 3628031 (1971-12-01), Azure
patent: 3849632 (1973-05-01), Eckert
patent: 3909594 (1973-12-01), Allais
patent: 3927303 (1973-02-01), Wefers

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