Under the data tracking function of the hottest ba

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Data tracking function of bar code technology (Part 2)

medical equipment manufacturing: QR code and reader are developing very rapidly in the medical equipment industry. Due to the need of traceability and program control, matrix QR code is widely used in this industry (Fig. 6 and Fig. 7). For products such as pacemakers, artificial joints and stents, if individual identifications can be directly printed on components and main parts, manufacturers can establish and maintain complete production records. Some manufacturers have marked special ID on some product parts to track the whole process of products. During the production process, the manufacturing process and test result information will be added to the data file of the component identification code. If an error is found, the manufacturer can use the barcode to track a part and obtain all information related to the test, component and operator. The matrix QR code is provided with positioning marks. Even small devices such as arterial stents or catheters can easily locate data information related to devices. Whether it is raw materials or final products, the new two-dimensional code machine can use permanent data positioning marks to immediately read relevant production information

figure 7 The manufacturer uses unique identification to record the production process of each component and part in detail. Working principle of bar code reader

laser scanning is a common interpretation method of one-dimensional code. The laser point (because it moves rapidly, it looks like a ray of light to the naked eye) sweeps the black-and-white barcode elements. The light sensor measures the amount of light reflected by each element (Fig. 8 and Fig. 9), converts the light energy into electric energy, and then converts the analog signal into digital signal through signal processing. The digital signal is decoded according to different code systems. After the data is decoded, it can be input into the laboratory information system, or the barcode reader can be used to perform logic tasks. The working principle of the one-dimensional code reader is similar to that of the laser scanner, because the bar codes that can be read in both viewing areas are the same in height and different in width. They cannot interpret QR code images because the device can only count horizontal scans

to read the QR code, you need to use the matrix reader to restore the experimental machine to its original state. The reader recognizes the image through the array of grayed pixels or matrix identification symbols, and the light source uses embedded matrix light-emitting diodes (LEDs), rather than a single laser diode or a single column led. Charge coupled devices (CCD) or complementary metal oxide semiconductors (CMOS) acquire the light energy reflected from the scanned object. The semiconductor converts the light energy into an analog signal, and then into a digital gray value

figure 8 The laser spot quickly scanned the bar code, looking like a ray of light

figure 9 In order for the one-dimensional code reader to interpret the barcode, the black bar and white bar of the barcode must be vertically aligned in the laser scanning viewing area

i when the one-dimensional code reader is used to interpret the bar code, the viewing area of the laser must be vertically aligned with the black and white bars of the bar code. It is important to align the bar code and maintain the specified direction of movement. However, if the above matrix reader is used to process QR code, there will be no such trouble. The matrix reader reads symbols as a whole in snapshot mode rather than scanning one by one, so it is not afraid to encounter the problem of poor contrast or damaged symbols

compared with laser bar code scanner, image QR code reader is more attractive. The old two-dimensional code system has the disadvantages of complex operation and high cost. Most two-dimensional code readers are bulky and expensive to run, so it is difficult to become a subsystem of diagnostic instruments. However, the newly launched micro megapixel scanner not only has the function of two-dimensional code reading, but also solves the problems of quality and calibration. It can be widely used in small mobile devices and large instruments

latest technology

most matrix readers produced in the past four years use 307200 pixel VGA (640 × 480) resolution. Instrument designers often face the dilemma of resolution and bar code viewing area. At present, aluminum hydroxide is the flame retardant with the largest sales of inorganic hydroxide. The micro megapixel reader has SXGA (1280) with more than 1million pixels × 1024) resolution, wider viewing area and higher resolution. It can read 100 QR codes or data matrix symbols in one image and process data in real time. With the wide viewing area, the reader can read all the bar codes on the whole row of test tubes at one time, and can read two-dimensional codes and one-dimensional codes at the same time. Multiple and multiple bar codes are scanned at the same time, and the whole data acquisition becomes faster and more efficient (Figure 10)

figure 10 So as to produce the required product, the micro megapixel reader can read 100 two-dimensional codes or data matrix symbols in an image

movable and fixed parts: the motor of the laser scanner is a movable part, which is used to move the reflector of the scanned object. In contrast, image readers are composed of fixed parts, and semiconductor materials and components are fixed. It uses matrix led to illuminate the object, and focuses the target image to CMOS or CCD image sensor through lens. The service life of LED is also longer than that of laser diode. The error rate of laser diode is as high as 120 times per 109 hours, while the error rate of LED is only 3 times per 109 hours. The laser diode will suddenly fail, and there will always be some symptoms before the LED fails. Using a small two-dimensional code reader, technicians can interpret one-dimensional code and two-dimensional code at the same time (FIG. 11)

figure 11 Using the micro two-dimensional code reader, technicians can interpret one-dimensional code and two-dimensional code at the same time

due to the use of fixed technology and led as light source, megapixel QR code readers are generally more durable than laser diode scanners. If the manufacturer uses this reader in the instrument, it can reduce the error rate of the instrument, thus greatly reducing the total cost of field service and barcode reader subsystem

due to its wide viewing area and small size, the micro megapixel QR code reader has superior aluminum material handling site. In fact, it does not need workers' scanning and mechanical characteristics, and can be more flexible and convenient to load various instruments. In addition, compared with the standard reader, this reader has lower application cost and smaller volume, and can save 2000 - 3000 dollars in industrial applications and equipment configuration such as automatic production lines. However, megapixel readers still have some shortcomings. In some cases, the efficiency of traditional industrial readers may be higher. Some megapixel readers are most suitable for static applications, and the scanned bar code objects need to remain static. When the moving objects on the conveyor belt are scanned, they must stop in front of the reader or pass through at a very slow speed. Therefore, for this kind of transmission scanning, it is more ideal to use a high-performance traditional reader


bar code system can ensure the quality and safety of products, and plays a very important role in equipment manufacturing and diagnosis industry. In addition, the bar code system can improve the integrity of automatic instrument data input. The new megapixel reader improves the reading performance of matrix QR code, making it more widely used in the medical field. Lower cost and smaller readers can be better installed in clinical analysis equipment

QR code reader technology is still developing. With the continuous reduction of equipment volume and the improvement of bar code application requirements, bar code reading technology will be further improved to meet the needs of equipment manufacturers

source: medical design and manufacturing OEM

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