公开(公告)号：US3770944A

公开(公告)日：1973-11-06

申请号：US3770944D

申请日：1972-05-01

Applicant: RCA CORP

Inventor： SCHANNE J ,  NICKL F

IPC: G06K7/10 ,  G07G1/10 ,  E04G17/00

CPC classification number: G06K7/10871 ,  G07G1/10

Abstract: Binary coded designator labels fixed to articles which they identify are scanned and the signals thereby obtained are employed to produce clock pulses. Various circuits are included for checking the accuracy of signals read from a label and for distinguishing them from marks or other data on the article.

公开(公告)号：US3796863A

公开(公告)日：1974-03-12

申请号：US3796863D

申请日：1972-01-19

Applicant: RCA CORP

Inventor： NICKL F ,  SCHANNE J

IPC: G06K7/10 ,  G06K19/06 ,  G08C9/06

CPC classification number: G06K7/10871 ,  G06K19/06018 ,  G06K2019/06243

Abstract: A machine readable binary encoded label having preamble, data and end sections comprising concentric annuli of two different reflectivities. The width of each annulus is an integral multiple N of some unit width. By limiting N to not greater than some given value, the data on the label, when read by optical scanning equipment which can detect transitions between reflectivities, provides the transition signals needed to resynchronize the scanning equipment clock circuitry.