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The Origin and Development of Bar Code Labels |
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| Release time:2013-08-20 Source:pengdan Reads: | |
| A bar code is an optical machine-readable representation of data relating to the object to which it is attached. Most of the bar codes are printed on the outside packaging of the objects, but for some products there are special labels to printed bar codes, which are called bar code labels. Originally bar codes represented data by varying the widths and spacings of parallel lines, and may be referred to as linear or one-dimensional (1D). Later they evolved into rectangles, dots, hexagons and other geometric patterns in two dimensions (2D). Although 2D systems use a variety of symbols, they are generally referred to as bar codes as well. Bar codes originally were scanned by special optical scanners called bar code readers; later, scanners and interpretive software became available on devices including desktop printers and smart-phones. The first use of bar codes was to label railroad cars, In 1967, with the railway system maturing, Collins went to management looking for funding for a project to develop a black-and-white version of the code for other industries. Unfortunately they declined, saying that the railway project was large enough and they saw no need to branch out so quickly. Collins then quit Sylvia and formed Computer Identical Corporation. This company made some improvement of the entire process of bar codes which is much simpler and more reliable and can deal with damaged labels by reading the intact portions. Bar codes were not commercially successful until they were used to automate supermarket checkout systems, a task for which they have become almost universal. There is a unique bar code for each item in supermarkets, either printed on the packaging or small bar code labels. Their use has spread to many other tasks that are generically referred to as automatic identification and data capture(AIDC). In some small stores, price & bar code labels are printed and sticked to objects when they are chosen and weighed. |
