公开(公告)号：CA2512707A1

公开(公告)日：1993-10-14

申请号：CA2512707

申请日：1993-03-24

Applicant: ABBOTT LAB

Inventor： LAGOCKI PETER A ,  MARTIN RICHARD R ,  STANTON ALYN K ,  VICKSTROM RICHARD L ,  WATKINS WILLIAM E III ,  KANEWSKE WILLIAM J III ,  OLEKSAK CARL M ,  CLARK FREDERIC L ,  WINTER GARY E ,  SCHRIER PAUL R ,  HILLS DAVID B JR ,  VAUGHT JAMES A ,  CLIFT GILBERT ,  TAYI APPARAO ,  SMITH B JANE ,  YOST DAVID A ,  WOHLFORD ROBERT A ,  HENDRICK KENDALL B ,  PENNINGTON CHARLES D ,  RUMBAUGH WILLIAM ,  MOORE LARRY W ,  CLOONAN KEVIN M ,  MITCHELL JAMES E ,  WALKER EDNA S ,  HANCE ROBERT B

IPC: B01L3/00 ,  B01L3/08 ,  B01L9/06 ,  G01N1/00 ,  G01N1/14 ,  G01N1/28 ,  G01N21/03 ,  G01N21/25 ,  G01N33/53 ,  G01N33/537 ,  G01N33/538 ,  G01N33/542 ,  G01N33/543 ,  G01N35/00 ,  G01N35/02 ,  G01N35/04 ,  G01N35/10 ,  G05D23/00 ,  H01J49/04 ,  H02P8/00 ,  H05B41/00

公开(公告)号：CA1305257C

公开(公告)日：1992-07-14

申请号：CA564512

申请日：1988-04-19

Applicant: ABBOTT LAB

Inventor： WINTER GARY E ,  EDELMAN JOHN T

IPC: G06K7/10 ,  G06K7/14 ,  G06K19/06

Abstract: An optical code reader system includes an optical code reader and a corresponding optical code format. The code reader includes a detector circuit for establishing an adaptive threshold level related to the difference in successive positive and negative peaks of the analog signal corresponding to white and black areas of the code. The code format comprises a plurality of alternating encoded black and white areas bounded by white quiet zones and black preset areas associated with the quiet zones for presetting the threshold value of the detector circuit to a known level before the code is read.