Bar code with optical reading device

Details Bar code with optical reading device Bar code with optical reading device

1982-03-05

1984-05-22

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

235463, 235467, 235469, G06K 710

Patent

active

044503490

ABSTRACT:
The novel bar code, in the spaces (4) between neighboring code bars (1) which have a width greater than one modular width, with the modular width always being larger than the diameter of the scanning spot (55) of a reading device, contains counting-line marks (5, 6) or counting bars (7). The thickness of the counting line marks is substantially smaller than the diameter of the scanning spot, for example one third of the width of the code bars. The counting bars have a reflectance lying between that of the spaces and that of the code bars. As a result of these measures, at the output of a photo-receiver (9) of a reading device, pulses (31) of a smaller amplitude than that of the pulses (30) formed by the code bar, are generated. By these pulses there is formed a counting clock by which the decoding is rendered independent of the scanning speed.

REFERENCES:
patent: 3471684 (1969-10-01), Berezov
patent: 3513320 (1970-05-01), Weldon
patent: 4147295 (1979-04-01), Nojiri
patent: 4308455 (1981-12-01), Bullis
patent: 4323772 (1982-04-01), Serge

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