The technology of fingerprint recognition is actually not unfamiliar, and it has already been used a lot in life. As the core of the fingerprint lock, the fingerprint identification system is closely related to the security and ease of use of the product, and the mystery of it will be revealed to you by Bida.
Fingerprints, due to their lifetime invariance, uniqueness, and convenience, have almost become synonymous with biometric identification. Fingerprints refer to the lines produced by the unevenness of the skin on the front of the end of the finger. The mainstream fingerprint collection and recognition technology have the following categories:
Optical fingerprint collection technology Currently the most widely used fingerprint collection technology, the light shines on the glass surface with fingerprints, the reflected light is obtained by CCD, and a clear fingerprint image is formed on the delicate CCD. After years of development, optical capture equipment has many advantages: it has good environmental adaptability and can withstand a certain degree of temperature changes; it can provide images with a resolution of more than 500dpi, which is a guarantee of recognition accuracy; at the same time, the sensitivity of fingerprint recognition is very high. , Less than 1 second, the experience is more smooth in actual use. Because of these characteristics, optical fingerprint collection technology has gradually become the mainstream fingerprint collection technology in the market.
The semiconductor fingerprint acquisition technology is on a "flat plate" integrated with thousands of semiconductor devices, and the finger is attached to it to form the other side of the capacitor (inductance). Because the surface of the finger is uneven, bumps and pits The actual distance of touching the tablet is different, and the formed capacitance/inductance value is also different. According to this principle, the device summarizes the different values collected to complete the fingerprint collection.
Radiofrequency fingerprint identification technology has developed today, and the third generation of bio-radio frequency fingerprint identification technology has appeared. The radiofrequency sensor technology emits a small amount of radiofrequency signal through the sensor itself, which penetrates the epidermis of the finger to control and measure the lines of the inner layer to obtain the best Fingerprint image. Therefore, it can pass up to 99% of difficult fingers such as dry fingers, sweaty fingers, and dirty fingers. The fingerprint sensor has a strong anti-counterfeiting ability. The identification principle of the fingerprint sensor only responds to human dermal skin, which fundamentally eliminates the problem of artificial fingerprints. Temperature zone: suitable for particularly cold or extremely hot areas.
Of course, the application of each technology also has certain advantages, disadvantages, and limitations. Semiconductor fingerprint technology is susceptible to static electricity. In severe cases, the sensor may not collect images, or even itself will be damaged; the disadvantage of optical fingerprint recognition is that the volume is relative to The size of semiconductors is large, and the recognition of dry fingers decreases in winter. However, in view of the many advantages above, optical fingerprint collection is now widely used in fingerprint door locks, fingerprint access control, fingerprint clocking machines, guns and ammunition, car fingerprint anti-theft management, etc. Bida fingerprint locks and well-known manufacturers in the industry also use this Technology; the third-generation bio-radio frequency fingerprint identification technology is far away from mass consumers in terms of manufacturing costs and is currently only used in some military scientific research fields. At present, these three fingerprint recognition technologies have their own advantages, but it is also necessary for the designer to master the core technology of this component. The key is to make good use of the advantages and control the disadvantages. Of course, consumers also need to make a suitable one according to their own conditions of use. Choice and judgment.
Author: Written by Mr.Juan from S4A INDUSTRIAL CO.,LIMITED
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