The History of Barcodes and Scanners
Bar code technology was born in the 1940s, but it has been practically applied and developed rapidly in the past 20 years. Bar code technology has been widely used in Europe, America and Japan, and it is being popularized rapidly all over the world, and its application field is still expanding.
Since the 1980s, people have carried out many researches on how to improve the information density of barcode symbols. Information density is an important parameter to describe barcode symbols. The number of letters that may be written per unit length is usually called the information density, and it is recorded as: the number of letters/cm. The main factors affecting information density are the bar-space structure and the width of narrow elements. EAN-128 barcode and 93 barcode are successful attempts made by people to increase density.
In 1981, 128 yards were launched by Computer Identic. The EAN-128 barcode was recommended in 1981; the 93 barcode was put into use in 1982. The symbol density of both barcodes is nearly 30% higher than that of the 39 barcode. With the development of barcode technology and the increasing types of barcodes, the standardization of barcodes is becoming more and more important. For this reason, the United States has successively formulated military standards; ANSI standards such as interleaving 25 bar codes, 39 bar codes and Coda Bar bar codes. At the same time, some industries have also begun to establish industry standards. For example, in 1983, the Automobile Industry Action Group (AIAG) selected 39 yards as the industry standard. This is the first industry to adopt "field identification" to identify bar codes.
In 1984, the Healthcare Barcode Council adopted Code 39 as its industry standard. In 1990, the American National Standard ANSI X3.182 for barcode printing quality was promulgated. To meet the needs of development. Since then, David Allier has developed the first two-dimensional bar code system - 49 codes. This is an unconventional barcode symbology that has a higher density than previous barcode symbologies. Ted Williams (Ted Williams) introduced the second two-dimensional barcode system in 1988—16K barcode. The structure of this code is similar to 49 codes. It is a relatively new code system and is suitable for laser systems. In 1990, Symbol Company launched the two-dimensional barcode PDF417. In September 1994, Japan Denso Company developed it into QR Code. In 2003, China Longbei Company developed Longbei Code, and Sigan Company developed a two-dimensional and half barcode code system—CompactMatrix. Since then, China has independent intellectual property rights in two-dimensional barcodes.
With the rapid development of barcode technology, a product that can read its content information was born, and its name is "scanning gun". The scanner gun was born in the 1980s. As a high-tech product closely integrating optical, mechanical, electronic, and software applications, it is the third-generation main computer input device after the keyboard and mouse. Due to the convenience and practicability of the scanner gun, it has been developed rapidly and widely used since its birth.
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