Bar code with alignment mark

Details Bar code with alignment mark Bar code with alignment mark

1980-10-20

1982-09-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250548, G06K 710

Patent

active

043497420

ABSTRACT:
Alignment mark 5 is printed by printer 30 during the same operation in which bar code 3 is printed. Subsequent alignment is by the optical scanner 32 centering on mark 5. In a specific application a factor relating to the vertical position of scanner 32 to printer 30 is obtained by scanning mark 5 shortly after it is printed. This factor is used to position the scanner 32 to read for errors after a line of code 3 is printed.

REFERENCES:
patent: 3463081 (1969-08-01), Levine
patent: 3862400 (1975-01-01), Thomson
patent: 4055747 (1977-10-01), Jensen
"Optical Mark Sensing of Single-Color Documents", W. B. Plummer, IBM Tech. Disc. Bull., vol 19, No. 8 1-1977, p. 3174.

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