公开(公告)号：JPH04284586A

公开(公告)日：1992-10-09

申请号：JP24787191

申请日：1991-09-26

Applicant: SYMBOL TECHNOLOGIES INC

Inventor： HARDESTY JOHN ,  BARKAN EDWARD ,  BARKAN CHRISTINA ,  FLETCHER DEAN ,  ALMEIDA TIMOTHY

IPC: G06K5/00 ,  G06K7/10 ,  G06K7/14 ,  G06K19/06

Abstract: PURPOSE: To provide a non-contact bar code confirming device which can be carried, easily used, and obtained with relatively low costs by expressing a reflectance state at the plural points of each target label and calibration by reflectance data. CONSTITUTION: A light reflected from a bar code label is detected by a scanning means arranged in a scanning module 105 behind a scanning window 125. A normal signal processing is locally operated by the scanning module 105 and a unit 110, and data points in 28 rows are generated. Each row is made correspond to the binary digital display of the light reflected from the bar code label during one time of emitter means sweep. The binary digital signal is converted into a time base count with a relative detection transition width by the unit 110. That is, a clocking digitizer generates an individual data point corresponding to a detecting time interval between reflectance level transition parts.