Teach you how to recognize the fingerprint lock fingerprint acquisition instrument is good or bad

Appeared as early as more than a decade ago the fingerprint door lock in China, when the market space is not large, the market sales channel is not much, a lot of people don't understand and use the concept of fingerprint lock, in the Internet today, let more people understand through the network to the value of it is much bigger than that of the industry forecast. Optical fingerprint acquisition instrument principle of traditional optical optical fingerprint acquisition instrument fingerprinted surface texture image, the finger contact surface of the prism, the light pressure according to the fingerprint of the surface of the glass, obtained by CMOS to reflect light, the amount of reflected light depends on the pressure in the glass surface of fingerprint ridge between the depth of the valley, and skin and glass oil and water. Light through the glass after exposure to the valley on the surface of glass and air total reflection, the light is reflected back at a CMOS, and toward the ridge of the light is not total reflection occurs, but the ridge and glass contact surface to absorb or diffuse elsewhere, thus formed on the CMOS fingerprint images. Traditional optical classification according to the principle of gathering, can be divided into light and dark background fingerprint acquisition instrument background fingerprint collection device: 1, the dark background fingerprint collection device adopts the principle of diffuse reflection, closely contact with acquisition of ridge prism, illuminate the ridge line beam diffuse reflection occurs, the fingerprint ridge line contact lens group site diffuse optical imaging to imaging device, shown as bright line, valley line contact, not light transmission still gathering prism, so that the valley line displayed on the imaging device for wiring, dark background image is obtained. 2, bright background fingerprint collection device adopts the principle of total reflection, closely contact with acquisition of ridge prism, destroyed the total reflection condition, part of the incident light is absorbed by the fingers, the remaining part of the diffuse light, lens group will reflect the beam to the imaging device, ridge line to absorb some of the total reflection of light, is shown as dark lines; Valley line and collecting surface contact, total reflection, still shown as bright line, forming a bright background of fingerprint image. The traditional optical advantages 1. The longest time, stability of the traditional optical technology mature is better. 2. Acquisition and comparison of fast, can be in 0. 5 s to finish. 3. Information collection and the image is clear, perfect, high sensitivity. 4. Working temperature can reach - 20 to 85 degrees. 5. Surface USES toughened glass, with a strong ability to resist damage. 6. Unit price is cheap. Traditional optical disadvantage to 1. Traditional optical fingerprint readers difficult to dry the fingers clear fingerprint image collected, caused this kind of product for dry finger recognition rate is low. 2. Traditional optical head for high temperature, the temperature change is big when the collection head will be deformation, into phase error will occur. 3. Module's power consumption is larger, if you use the red light is can reduce power consumption, but is highly affected by the external light; So now is launch blue light is used to improve his stability. However, this power is hard to avoid. 4. The volume of the optical head is very big, this is decided by his collecting principle of this structure. Semiconductor principle of semiconductor fingerprint sensor semiconductor acquisition instrument is a general designation, it includes the capacitance signal through gathering and electric signal, temperature signal, Thermal) Come into a phase of sensors, pressure signal. Simple principle is as follows: launch a rf signal sensor, signal after the fingerprint of grain reflection, in the same contour surface appear different capacitance change characteristic, the number of charge how much different, for these features detection, finally got the image. Semiconductor advantage 1. Due to the sensor chip focused tens of thousands of electronic components, induction rate and high sensitivity. 2. On the discrimination ability of the dry finger is better than the traditional optical. 3. Can do small size, be helpful for structure design of the product. 4. Working temperature can reach - 10 to 60 degrees. The disadvantages of 1 of the semiconductor. Capacitance sensor is of high precision, easy to damage the material, so, explosion-proof performance is poor. 2. Antistatic ability is poor. 3. Oil dirt in her fingers when wear sweat and fingers. 4. Gathering area is small, will be worse than the optical sensor stability. 5. Price is expensive. Sapphire collection device principle of sapphire sapphire fingerprint acquisition instrument fingerprinted surface texture image, finger contact sapphire toughened glass coating plate, backlight illumination to press the fingerprint of the surface of the glass, the fingerprint ridge part of the total reflection does not occur, the valley of total reflection, the total reflection of light by induction Sensor receives and form a bright background fingerprint image. Working principle to the semiconductor, just light instead of electricity. Sapphire problem 1. Due to the sapphire closer semiconductor fingerprint collection device adopts photoelectric structure type, so at the same time with the capacitance of a hotshot finger discrimination and optical high wet finger discrimination. 2. Sapphire is 1:1 imaging, no image distortion, collected information will be more perfect than the traditional optical, higher identification accuracy. 3. Inherited and to strengthen the traditional optical sapphire prevent damaging, the highest hardness can reach 9 h ( The hardness of diamond is 10 h) , can withstand strong outside force. 4. The thickness of the sapphire can be comparable to the semiconductor is small, can well meet the product structure design, the appearance is beautiful atmosphere. 5. Sapphire collection chip is 256 * 300 pixels, than now we use semiconductor 176 * 176 pixels. The more pixels, the greater the acquisition of feature points, security is better. Arguably the best fingerprint collection device on security market.
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