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Sensor for recognizing magnetic media

A technology of magnetic media and magnetic sensing elements, applied in the field of magnetic sensors, can solve the problems of high cost and technology, low threshold for counterfeiting, low precision, etc., achieve high precision and improve the effect of anti-counterfeiting encryption level

Active Publication Date: 2014-01-29
蚌埠希磁科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing magnetic sensor reads the signal of the magnetic medium by applying a constant excitation field to measure the leakage field of the magnetic medium to identify the authenticity of the magnetic signal. Taking advantage, the threshold for counterfeiting is relatively low, and the technical means are relatively mature
[0003] However, the magnetic properties of different regions of the magnetic medium strip are different. The cost and technology of the pseudomolecule to produce the same magnetic properties and distribution as the original magnetic medium material are relatively high.

Method used

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  • Sensor for recognizing magnetic media
  • Sensor for recognizing magnetic media
  • Sensor for recognizing magnetic media

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] like figure 1 As shown, the sensor for identifying magnetic media provided by this embodiment includes a sensing unit 11 and an electromagnet 13 . The sensing unit 11 includes a magnetic sensing element and a corresponding circuit, which are located at the central opening of the electromagnet 13 . Wherein the electromagnet 13 is used to provide the alternating excitation field 21 for the magnetization medium, the excitation field 21 can be in any direction, and this direction can be adjusted according to the shape of the excitation field 13, and its field strength and frequency can be controlled by the current of the electromagnet coil to decide. During work, the magnetic medium strip 22 moves under the electromagnet 13 and the sensing unit 11, and the electromagnet 13 produces an alternating excitation field 21 to magnetize the medium particles 23, and the sensing unit 11 located in the electromagnet 13 can be opposite to the electromagnet 13. While the medium partic...

Embodiment 2

[0023] like figure 2 As shown, the sensor for identifying magnetic media provided by this embodiment includes an excitation 14 , a sensing unit 11 , an excitation 15 and a sensing unit 12 . There is a layer of shielding layer 16 outside the excitation 14, 15, one end of the shielding layer 16 is open, the opening surface is the detection surface, and the material of the shielding layer is soft magnetic material. The sensing unit includes a magnetic sensing element and a corresponding circuit. The magnetic field induction directions 1 and 2 of the two sensing units are the same. The sensing unit 11 and the sensing unit 12 are located on the same side of the excitation 14 and the excitation 15 respectively. 14 and 15 are used to provide excitation fields 24 and 25 to magnetize the medium, and the excitation fields 24 and 25 are perpendicular to each other. The excitation can be a permanent magnet or an electromagnet. The width of the effective excitation field is greater than ...

Embodiment 3

[0025] like image 3 As shown, the sensor for identifying magnetic media provided by this embodiment includes an excitation 14 , a sensing unit 11 , an excitation 15 , a sensing unit 12 and an electromagnet 13 . There is a layer of shielding layer 16 outside the excitation 14, 15, one end of the shielding layer 16 is open, the opening surface is the detection surface, and the material of the shielding layer is soft magnetic material. The sensing unit 11 and the sensing unit 12 include magnetic sensing elements and corresponding circuits. The magnetic field induction directions 1 and 2 of the two sensing units are the same, and one sensing unit 12 is located at the middle opening of the electromagnet 13 . The sensing unit 11 and the sensing unit 12 are located on the same side of the excitation 14 and the excitation 15 respectively. The excitations 14 and 15 are used to provide the excitation fields 24 and 25 to magnetize the medium. The excitation fields 24 and 25 are perpendi...

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PUM

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Abstract

The invention discloses a sensor for recognizing magnetic media. The sensor is used for recognizing magnetic media such as magnetic security paper, paper currency, check and magnetic cards, and is characterized by comprising one or a plurality of sensing units and an excitation magnet, wherein the excitation magnet provides different excitation magnetic field directions; and the sensing units are used for detecting the component of leakage magnetic fields of the magnetic media magnetized by the excitation magnet along the magnetic field induction field. The sensor can be used for accurately measuring magnetic performance and distribution of the magnetic media. Compared with a universal magnetic-head sensor, the sensor has higher precision, so that the anti-counterfeiting security level can be improved.

Description

technical field [0001] The invention relates to the technical field of magnetic sensors, in particular to a sensor for identifying magnetic properties of magnetic media such as magnetic security paper, banknotes, checks and magnetic cards. Background technique [0002] In daily life, magnetic media are widely used in various anti-counterfeiting and encryption, such as various magnetic security papers, banknotes, checks, magnetic cards, etc. The existing magnetic sensor reads the signal of the magnetic medium by applying a constant excitation field to measure the leakage field of the magnetic medium to identify the authenticity of the magnetic signal. Taking advantage, the threshold for counterfeiting is relatively low, and the technical means are relatively mature. [0003] However, the magnetic properties of different regions of the magnetic medium strip are different, and the cost and technology of the pseudomolecule to manufacture the same magnetic properties and distrib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G07D7/04
Inventor 白建民王建国黎伟
Owner 蚌埠希磁科技有限公司
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