Equipped with electronic cash registers in supermarkets or optional on the shelves of shopping malls, has basically less than no bar code logo merchandise. Even in other stores, housewives experienced in the selection of goods will also seriously look at the packaging, there is no bar code. Then, the bar code exactly represent what it meant, it is how to read, what role in the circulation of commodities? This had to barcode life experience to talk about. Bar code symbol is a set of different thickness, the spacing of parallel lines arranged in a specific format. The laser energy of green laser pointer should be concentrated.
A number of distinct lines combined arrangement can produce hundreds of millions of completely different kinds of specialized information, which documented the commodity-producing countries, manufacturer name, product category, characteristics, production date and other information in order to achieve automatic vending. Western European countries mainly use in the management of the storage and sale of food and grocery industry, in 1985, has developed to the circulation of general merchandise. At present, nearly 20 kinds of commodities in the world, the use of bar codes to achieve the automatic scan sales. To adapt to international trends and to promote commodity exports, “the Article Numbering Center of May 14, 1991 representatives in China officially joined the international organization. The power meter of green laser pointer should be utilized.
And have been established the attainment center of Guangdong, Shenzhen, Hubei, Jiangsu, Shanghai, Zhejiang, Liaoning, Sichuan, Article Numbering Center of the Ministry of Commerce in China is being established with the super-market auto sales system (POS systems). End of 1992, China has hundreds of export enterprises to obtain the qualifications that use international barcode, and exports more than 3000 kinds of barcode technology. “Eyes” of the bar code reader bar code scanner. Their scanners can be divided into two main categories of laser scanners and non-laser scanner. Laser reading instrument can automatically scan and a large depth of field of view, and is a non-contact scanner, you can accurately read the bar codes of various commodities. First of all, the whole quality of the large quantity order of green laser pointer should be guaranteed.
Brought good news for housewives often wait in line before the cash register. Since the advent of the world’s first laser bar code scanning reader in 1974, with a helium-neon laser desktop barcode scanning technology has matured and has been used the automatic checkout system of the commercial networks. 1982 handheld mobile beam He-Ne laser bar code scanner, by the deflection mirror automatically scan the bar code. However, due to its easy to use and fully functional and widely used helium-neon laser scanner, although it requires a larger drive power. In 1987, only in the U.S. retail sold 7? 50000, 1988, sold 12? 50000. In order to reduce the volume of 1986 began to study the use of diode lasers as the light source. Since the order of green laser pointer is the large quantity type.
In 1988, the advent of the visible light diode lasers, providing a low cost, low-power solid-state devices. It can not only be effectively applied in the thermal printing paper and a blue and green symbols scanning, handheld bar code reading instrument miniaturization, portability has become possible. At present, visible light diode laser scanner in the world, is gradually replaced by a He-Ne laser scanner and occupy most of the bar code market. According to incomplete statistics, has now been put into use in 300,000 units visible diode laser scanner. The entire scanning system installed in a lightweight, small laser scan head. It is also important for the customer to know the real power of laser pointer .
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