Looking at the unexposed pattern in the sand, I suddenly had an idea: just like Morse code uses dots and short-term communication information, you can use thin lines and thick lines to encode information. The code in the stripe can describe the product and its price, which can be read by the machine.
The idea is feasible, but the technology is too expensive However, with the development of computer and the invention of laser, this idea has gradually become more realistic.
By the early 1970s, the engineer George Los Angeles, an IBM engineer, had developed a system using lasers and computers. Graffiti on the forest by the sea is a technical reality.
1June, 974, a salesman aged 3/kloc-0 scanned a pack of bubble gum 50 times, and automatically summed up 67 cents in the laser scanner. The chewing gum was sold and the bar code was born.
The beam code is used to identify the country or region, and the exchange rate weight is based on ean international, for example, 00-09 represents the United States and Canada. 45, 49 stands for Japan. 69 stands for China, 47 1 stands for Taiwan Province Province of China, and 489 stands for the Hong Kong Special Administrative Region.
Authorized by the Manufacturers' Committee, manufacturers' codes are given to national art coding centers in various countries or regions. Commodity codes are codes used to identify products, and codes are integrated from products produced by products.
At last, the correctness of 1-12 at the bottom left of the barcode is verified by1check code. Commodity barcode refers to a set of regular, empty and corresponding character symbols, which represent some commodity information.
One of them is dark, empty and bright, which is used to scan bar code reading equipment. Its corresponding role consists of a set of Arabic arrays, which are used for people who directly read or input data through the keyboard. The information indicated by this set of bands and corresponding characters is the same.