It was not until the 1949 patent literature that the full range of bar code symbols invented by Norm Woodland and Bernard Silver was recorded for the first time in previous patent documents. There is no record of bar code technology and there is no precedent for practical application. Noam Woodland and Bernard Silve's idea was to use the vertical "bars" and "emptiness" of Colmend and Yang, and bend it into a loop, much like the target of archery. This allows the scanner to decode the bar code symbol by scanning the center of the graphic, regardless of the orientation of the bar code symbol.
In the course of continuous improvement using this patented technology, Isaac Azimov, a science fiction writer, described in his book The Naked Sun. Use the new method of information encoding to achieve automatic recognition of cases. At that time people thought that the bar code symbol in this book looked like a square checkerboard, but today's bar code professionals will immediately realize that this is a two-dimensional matrix bar code symbol. Although this bar code symbol has no direction, orientation, and timing, it is obviously a digital code with a high information density.
Until Iterface Mechanisms developed a "two-dimensional code" in 1970, it was able to print and read a two-dimensional matrix bar code at a price suitable for sale. At that time, two-dimensional matrix bar codes were used to automate the newspaper publishing process. The two-dimensional matrix bar code is printed on a tape and scanned by today's one-dimensional CCD scanner. The light emitted by the CCD shines on the tape, and each photocell is aligned with a different area of the tape. Each photocell outputs a different pattern according to whether or not the barcode is printed on the tape, and the combination produces a high-density information pattern. In this way, a single character can be printed in the same size space as a single bar in the earlier Corond code. Timing information is also included, so the whole process is reasonable. When the first system enters the market, a complete set of equipment, including printing and reading equipment, costs about $5,000.
Shortly thereafter, with the continuous development of LEDs (Light Emitting Diodes), microprocessors, and laser diodes, new signs (symbols) and their application explosions were ushered in, which people call "barcode industries." Today it is rare to find companies or individuals who have not directly touched the fast and accurate barcode technology. As technological progress and development in this area is very rapid, and more and more applications are being developed every day, it will not be long before bar codes become as popular as light bulbs and semiconductor radios, and will make every one of us live. Have become more relaxed and more convenient
Norman Woodland, the inventor of the bar code, died on December 17, 2012. He invented bar codes in the 1970s, transformed global business activities, and saved a lot of time for consumers' supermarket shopping.
His daughter Susan Woodland said that 91-year-old Norman Woodland died in New Jersey on Saturday because of complications of Alzheimer's disease. According to UPC’s US Division GS1 US organization, the world currently scans bar codes 5 billion times a day.