Barcode technology is an automatic recognition technology developed in computer applications. The bar code that people see on products every day is a one-dimensional bar code, and the information capacity is small. The bar code on general merchandise can only accommodate 13 Arabic numerals. In the application, you can only rely on database support. Without the database, its scope of application will be greatly limited. Therefore, people urgently need a recognition technology with large information capacity, high reliability and low cost. Based on the above reasons, the data matrix two-dimensional code came into being.
What is two-dimensional data matrix code
two-dimensional code is in a rectangular space, encoded by the black and white pixels of different distribution in the matrix. In the position of the corresponding element of the matrix, the binary "1" is represented by the appearance of a point (square point, dot or other form), the binary "0" is represented by the non-occurrence of the point, and the arrangement of the points determines the matrix type two-dimensional code. The meaning represented. The technology is based on computer image processing technology, combined coding principle, etc. A new type of graphic symbol automatic reading and processing code system, because the information is expressed simultaneously in both the horizontal and vertical directions, so it can be expressed in a small area. A lot of information is called "portable data files." In South Korea, people can use the mobile phone QR code by bus.
The characteristics of the QR code
(1) High-density coding, the information capacity can accommodate up to 1,850 uppercase letters or 2710 digits or 1108 bytes, or more than 500 Chinese characters, which is about several times higher than the ordinary barcode information capacity.
(2) Wide range of codes The bar code can encode pictures, sounds, characters, signatures, fingerprints, etc., which can be digitized, and is represented by bar codes; it can represent multiple languages; it can represent image data.
(3) Strong fault tolerance and error correction function. When the 2D barcode is partially damaged due to perforation, fouling, etc., it can be correctly read, and the damaged area can still recover information by 25%.
Figure 1 Comparison of barcode and two-digit code
(4) High decoding reliability It is much lower than the error rate of ordinary bar code decoding, and the bit error rate is less than one ten-thousandth.
(5) Encryption measures can be introduced to ensure confidentiality and anti-counterfeiting.
(6) Low cost, easy to manufacture, and durable.
(7) Bar code symbol shape, size ratio can be changed.
(8) The 2D barcode can be read using a laser or CCD reader.
QR code current application area
With the development of automatic identification technology, the application of QR code (international standard BS ISO16022) in logistics, postal, aviation, automotive, medical/medicine, electronics, general industry, and retail is becoming more and more widespread. The ATA Spec2000 standard is included in the aviation industry. In the general industrial field, it is widely used. The QR code can be directly placed on the metal surface by means of needle, laser, electric corrosion, etc., and all the information of the part is stored therein.
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Figure 2 Metal surface two-dimensional code marking
The advantages of using QR codes for part identification are:
(1) Part identification is unique and permanent.
(2) The parts in use can be tracked.
(3) The in-process product can be tracked.
(4) Effective supply chain management is possible.
(5) Prevent defective products.
(6) Enhance the security of data.
(7) The data range is variable.
(8) Reduce human error.
(9) Store more information in a smaller area.
(10) Reduce artificial transcription errors through automatic data collection.
The advantages of data matrix two-dimensional code identification on the surface of metal parts are obvious, but to be 100% machine readable, it has always been the technical threshold for the application of QR codes on metal surfaces. In this field, PRYOR UK, which has 157 years of experience in marking equipment production, has become a leader, as a professional manufacturer of marking tools and equipment, and has accumulated rich experience in the QR code marking on metal surfaces. The series of dot matrix marking machines, laser marking machines, and electrocorrosion marking machines have been solved by the ROLLS ROYCE (Rolls Royce Company) because it perfectly solves the problem that the QR code is 100% machine readable on the surface of metal parts. ) Confirmed that it is the designated supplier of the needle marking machine and writes it to its corporate standard (JES131-22).
Figure 3 Multidot2068 industrial dot matrix marking system
Figure 4 Electro-corrosion marking system
In the field of marking technology, PRYOR has become a world-famous leader and is recognized as one of the most innovative and product-rich companies in the field of industrial marking. Among them, the portable LD2 dot matrix marking machine and the flagship product industrial dot matrix marking system Multidot2068 are well received in the industry, and equipped with its matching QR code recognizer, which perfectly solves the industrial metal parts from identification to identification. A series of problems. As the sole agent of PRYOR in China, Nanjing Anmai Electromechanical Co., Ltd. has successfully provided many sets of marking systems for marking from two-dimensional code to two-dimensional code identification for many domestic aviation manufacturers. Praised by users.
Figure 5 QR code recognition system
In today's industrial field, high efficiency, high automation and production cost control have become the goal of the industry. The unique and permanent identification of QR code with its high information capacity, automatic machine identification and low cost will inevitably Become the development trend of future marking in the industrial field.
