A long size detection magnetic sensor and its manufacturing method

Abstract

The invention provides a long size detection magnetic sensor and a manufacturing method thereof. The long-dimension detection magnetic sensor includes at least one detection unit and a printed circuit board supporting the detection unit, the detection unit includes at least one set of chipsets, and each set of chipsets includes at least three short magnetic sensor chips, each set The short magnetic sensor chips in the chipset are arranged horizontally and sequentially. The long-dimension detection magnetic sensor has low cost, and also has the advantages of simple structure, small volume, thin thickness, high sensitivity, etc., and meets the requirements of modern society for miniaturization, integration, low power consumption and high performance of magnetic sensors.

Description

technical field [0001] The invention belongs to the technical field of magnetic sensors, and in particular relates to a detection magnetic sensor for detecting long-size magnetic marks and a manufacturing method thereof. Background technique [0002] The magnetic sensor uses the characteristic that the sensitive unit is sensitive to magnetic changes caused by changes in magnetic field, current, stress and strain, temperature, light, etc., captures the magnetic changes of the device under test through the sensitive unit, and then converts the magnetic changes into electrical signals to measure The electrical signal can distinguish the size of the device under test. Magnetic sensors are widely used in aviation, aerospace, microelectronics, geological prospecting, medical imaging, information collection, finance and military and other fields. [0003] The traditional magnetic sensor uses a coil as the magnetic sensitive unit. This kind of magnetic sensor with the coil as the m...

AI Technical Summary

Problems solved by technology

[0004] However, with the development of anti-counterfeiting technology, in order to enhance the anti-counterfeiting ability of financial currency or bills, the length of anti-counterfeiting marks continues to increase, and the distribution of anti-counterfeiting marks is becoming wider and wider, which greatly increases the difficulty of detecting counterfeit marks

Although the detection range of the magnetic induction sensor can be expanded by increasing the length of the magnetic induction film, the increase in the length of the magnetic induction film will reduce the yield of the magnetic sensor chip and increase the manufacturing cost of the magnetic sensor chip due to the limitation of the wafer density.

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