Method of printing and detecting optimum bar code test patterns

Details Method of printing and detecting optimum bar code test patterns Method of printing and detecting optimum bar code test patterns

1981-11-30

1984-05-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235462, 235485, 382 50, G06K 710

Patent

active

044490526

ABSTRACT:
Test patterns (6) in bar code of different densities are printed at the start of document (20) preparation on the line with a alignment mark (5). The test patterns (6) are immediately read at different timing intervals (59) corresponding to the densities of the patterns. The highest density pattern (6) having test data which is recognized by the logic (61) as correctly sensed, defines the subsequent printing density to be used. First, the next line of data 3 is printed in the lowest density with a code defining the density of the subsequent printing. When a document (20) is read, the first line is read with the clock (59) intervals corresponding to the lowest density. The frequency is then changed to that defined by the code in the first line. Alternatively, the frequency is adjusted lower when an ordinary line of data is re-read and found to read incorrectly.

REFERENCES:
patent: 4044227 (1977-08-01), Holm et al.
patent: 4349741 (1982-09-01), Bobart et al.
patent: 4349742 (1982-09-01), Flurry et al.
IBM Technical Disclosure Bulletin, "Bar Code Record Format" by K. L. Bobart et al., vol. 24, No. 4, Sep. 1981, pp. 1793-1795.
IBM Technical Disclosure Bulletin, "ETAB Bar Code" by D. W. Phillips et al., vol. 21, No. 7, Dec. 1978, pp. 2883-2884.

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