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Fingerprint transducer sensitivity automatic regulating method

A fingerprint sensor, sensitivity adjustment technology, applied in the direction of instruments, character and pattern recognition, computer parts, etc., can solve the problems of large individual differences in sensitivity, changes, etc., to improve sensitivity, reduce sensitivity, and avoid oversensitive and dull. Effect

Inactive Publication Date: 2008-03-12
ZHEJIANG MIAXIS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem that the sensitivity of the sensor varies greatly among individuals and will change, the present invention provides a method for automatically adjusting the sensitivity of the fingerprint sensor. Through the sensitivity adjustment device, the sensitivity is dynamically set to ensure that the sensitivity of the sensor is kept at an ideal value at all times.

Method used

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  • Fingerprint transducer sensitivity automatic regulating method

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0015] In a preferred specific embodiment, as shown in FIG. 2 , a fingerprint sensor sensitivity automatic adjustment device 1 includes a detection device 2 and a sensitivity adjustment device 3 . Wherein, the detection device 2 can be an inductive finger detection device, and the sensitivity adjustment device 3 can be a sensitive resistor and a capacitor. The detection device 2 detects whether there is a finger covering, and sends the result information to the sensitivity adjustment device 3; according to the detection result, the sensitivity adjustment device 3 adjusts the sensitive resistance and capacitance, and then adjusts the sensitivity of the detection device to keep it near the optimum value . Without pressing your finger, the adjustment system can automatically adjust the sensitivity to near the optimum value.

[0016] This fingerprint sens...

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Abstract

The invention relates to a auto adjusting method of finger mark transducer sensitivity which comprises the following steps: 1) the transducer sensitivity of finger mark detector is S=S0 after initialing; 2) finger mark detector detects weather there is a finger covering; 3) sensitivity adjusting device can do selected finger mark transducer sensitivity adjustment by detesting results. It increases finger mark detector sensitivity when it can't detect finger, while it decreases the sensitivity when it detects the finger.

Description

Technical field: [0001] The invention relates to the field of fingerprint sensors, in particular to a method for automatically adjusting the sensitivity of a fingerprint sensor. Background technique: [0002] The inductive fingerprint sensor is a commonly used fingerprint sensor at present. The principle is that when the sensor senses that a finger is covered, it will send an electrical signal to the finger and measure the strength of the electrical signal at various places on the finger; according to the strength of the finger ridge and the valley electrical signal, a fingerprint image can be formed. [0003] Sensitivity refers to the sensitivity of the sensor to detect whether it is covered by fingerprints. As shown in Figure 1, any fingerprint sensor will have an ideal sensitivity range, within which the sensor can work normally. If the sensitivity is set too high, the sensor will be too sensitive, and it will be regarded as a finger when there is no finger; if the sens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
Inventor 刘中秋
Owner ZHEJIANG MIAXIS TECH CO LTD