Supply PVC barcode cards, membership cards, barcode cards - Shanghai Country

Barcode symbols are combined with the blank lines in accordance with certain encoding rules to represent certain letters, numbers and other information. Carrying identification when it is scanned with a bar code reader, get a group of reflected light signal, this signal after photoelectric conversion into a group with lines, blank corresponding electrical signals, after decoding reduced to the corresponding digit, then into a computer. Bar code identification technology is quite mature, it reads the error rate of about one millionth the first reading of greater than 98%, is a high reliability, fast input, high accuracy, low cost, wide application of information automated collection techniques. Approximately half the world more than 225 kinds of one-dimensional bar codes, each one-dimensional bar code has its own set of coding specifications, the provisions of each letter (which may be text or numeric or alphanumeric) is composed of several lines (Bar) and a few blank (Space) composition, and arrangement of the letters. Usually the more popular one-dimensional bar code has 39 yards, EAN codes, UPC, Code 128, as well as books and periodicals devoted to the management of ISBN, ISSN, etc.