Pvc barcode card is a kind of card the lines with blanks in a certain encoding combining rule symbol, represent a certain amount of letters, numbers, and other information. At the time of identification is the use of pvc card reader scan, get a set of reflected light signal, after the signal opt-electronic transferring into a set of electronic signal corresponding to the line, white space, after decoding the restore to the appropriate article number, then the incoming computer. Bar code identification technology is very mature, they read error rate of about one out of 10,000, first rate greater than 98%, is a enter a fast, high accuracy, high reliability, low cost, using wide data automatic collection technology. About 225 species in the world more than one-dimensional bar code, each one-dimensional bar code has its own set of encoding specifications, each letter (which may be text or a number or alphanumeric) is determined by a few lines (Bar) and a few blank (Space), as well as the arrangement of letters. Generally speaking , the more popular code of pvc card are linear bar code 39, EAN codes, UPC codes, 128 yards, dedicated to books and periodicals, and management of the ISBN, ISSN, etc. Various one-dimensional barcodes the invention of the era summarized in table 1, pvc barcode card
standard-setting era are summarized in table 2. one-dimensional bar codes invented year represents the year 1949 Bull pvc barcode card name inventor or company special significance’s Eye Code (code bulls eye) N. Joe Woodland and Bernard Silver 1973 first bar code UPC Barcode 1972 IBM first large-scale application of Codabar Monarch Marking System 1974 39-yard David c. Allias (Intermec) First commercial 1981 Code 128 alphanumeric 1976 EAN bar codes EAN Association 1983 Code table 93 one-dimensional bar code standards-setting year represents the year 1982 Code39 Military Standard 1189 1983 Code39 barcode the inclusion criteria, Interleaved 2 of 5, Codabar ANSI MH10.8M 1984 UPC ANSI MH10.8M 1984 Code39 AIAG standards since 1984 Code39 HIBC standards from the UPC, in order to meet different application needs, one after another the development of a variety of different barcode standards and specifications, even today, pvc barcode card have become indispensable for business automation basic conditions.pvc barcode card may is divided into a dimension barcode (One Dimensional Barcode, 1D) and II dimension code (Two Dimensional Code, 2D) two large class, currently in commodity Shang of application still to a dimension barcode mainly, so a dimension barcode and was called commodity barcode, II dimension code is another a gradually by attention of barcode, its function more a dimension barcode strong, application range more widely, more content will next a chapter describes. Current types of one-dimensional barcodes up to about 225 species around the world, this book describes only the most common criteria, such as UPC, EAN, 39 yards, 128 yards, and so on. In addition, books and journals are also internationally harmonized codes, pvc barcode card known as the ISBN (international standard book number) and the ISSN (international standard serials number). (Editor：admin) |
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