Magnetic modulation device and magnetic sensor
A magnetic sensor and magnetic modulation technology, which is applied in the field of magnetic sensors, can solve the problems of reducing the sensitivity of magnetic sensors, etc., and achieve the effects of improving anti-interference ability, suppressing noise, and improving sensitivity
Inactive Publication Date: 2019-02-15
BEIJING JIAYUE TONGLEJI ELECTRONICS
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- Description
- Claims
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Problems solved by technology
However, during use, the magnetic field generated by the permanent magnet placed near the magnetic chip inevitably has a horizontal component, which seriously reduces the sensitivity of the magnetic sensor
At the same time, other magnetic fields in the external environment will also produce horizontal components, which will seriously reduce the sensitivity of the magnetic sensor
Method used
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[0055] In order for those skilled in the art to better understand the technical solution of the present invention, the magnetic modulation device and the magnetic sensor provided by the present invention will be described in detail below with reference to the accompanying drawings.
[0056] Such as Figure 1a and Figure 1b As shown, the magnetic sensor includes a housing 1, a magnetic chip 2, a circuit board 3, a permanent magnet 4, a magnetic modulation device 5 and a welding pin 6, and the magnetic chip 2, the circuit board 3, the permanent magnet 4 and the magnetic modulation device 5 are arranged in the housing 1 Inside. Among them, the magnetic chip 2 is used to induce the magnetic field of the anti-counterfeit mark, the circuit board 3 is used to support and electrically connect the input and output terminals of the magnetic chip 2, the permanent magnet 4 is used to pre-magnetize the weak magnetic anti-counterfeit mark, and the magnetic modulation device 5 is used to ad...
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The invention provides a magnetic modulation device which is used for modulating the magnetic field distribution of permanent magnets. The magnetic modulation device is characterized by comprising 2n magnetic conduction modulation arms, n is an integer larger than or equal to 2, the 2n modulation arms are sequentially and oppositely arranged at intervals so that a containing space can be formed between every two adjacent modulation arms, the 2n-1 containing spaces are formed by the 2n modulation arms, each permanent magnet is arranged in any one of every two adjacent containing spaces, and the modulation arms are used for eliminating or reducing the horizontal components, in the containing spaces provided with no permanent magnets, of the magnetic fields of the permanent magnets. By means of the magnetic modulation device, the horizontal components, in the first containing spaces, of the magnetic fields of the permanent magnets can be eliminated or reduced, and the environment noise can be restrained. The invention further provides a magnetic sensor.
Description
technical field [0001] The invention belongs to precision testing instruments, in particular to a magnetic modulation device capable of changing the magnetic field distribution and a magnetic sensor using the magnetic modulation device. Background technique [0002] Magnetic sensors are widely used in banknote detectors, ATM machines and identification instruments to identify the authenticity of banknotes, bills, trademarks, etc. with anti-counterfeiting marks inside them. In order to improve the anti-counterfeiting ability, not only hard magnetic anti-counterfeiting marks, but also soft magnetic anti-counterfeiting marks are provided in banknotes, bills, trademarks, etc. Among them, the soft magnetic anti-counterfeiting mark is ultra-very magnetic, which itself does not have magnetism or has very weak magnetism, but it can quickly obtain instantaneous magnetism after being magnetized, thereby generating a magnetic field that can be sensed by the magnetic sensor. A permanen...
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IPC IPC(8): G07D7/04
Inventor 刘乐杰朱卓胜曲炳郡姚明高
Owner BEIJING JIAYUE TONGLEJI ELECTRONICS