History of fingerprint identification: as early as more than 2000 years ago, people in ancient China used fingerprints to sign contracts and solve cases. The book Yunmeng bamboo slips during the Warring States period recorded the story of using fingerprints as evidence to solve cases. In the Tang Dynasty, the development of fingerprint technology made greater progress. At that time, the scholar Jia Gongyan was a pioneer in fingerprint identification. At that time, he found that everyone's fingerprint mastoid and pattern structure were different. For example, some people have bucket patterns and others have dustpan patterns. They compared the details for fingerprint identification.

Fingerprint identification and authentication process: fingerprint identification is to collect human fingerprint information when people touch the fingerprint identification instrument, then digitize the fingerprint information, and then compare it with the fingerprint you entered in advance. The final output refers to the reaction information.

Types of fingerprint identification technology:

1. Optical fingerprint identification

Literally, this is to use the reflection principle of light to reflect your fingerprint. The cost is very cheap and has a great impact on identification. Dirty and wet hands are difficult to identify, and there is a risk of being stolen by false fingerprints in this way. This technology is not only applied to punch in machines and fingerprint locks. Nowadays, the off screen fingerprint identification of many mobile phones uses the optical principle.

Characteristics of optical fingerprint identification: low cost, low precision and low security

2. Semiconductor fingerprint identification

It is also generally called capacitance identification and living fingerprint identification. The principle is that a lot of capacitive plates are set on the identification sensor, and the areas of these capacitive plates are the same. When the user presses it on the sensor, the skin appearance corresponds to these capacitor plates one by one, so a complete plate capacitor is formed. Due to the existence of raised ridge (fingerprint raised part) and depression Valley (fingerprint depressed part) in the fingerprint. Therefore, the spacing between the two plates of each capacitor is not the same. As a result, the size of each capacitor is different. Capacitive fingerprint sensor obtains fingerprint information by detecting the difference of coupling capacitance between capacitance and fingerprint touch time.

Characteristics of semiconductor fingerprint identification technology: high precision and strong security

Article from: Zhongshan fingerprint lock manufacturerhttp://www.zshaochangsheng.com/