magnetic sensor device

The magnetic sensor device addresses stress and temperature-induced errors by offsetting its center of gravity and using magnetoresistive elements with controlled magnetization, improving detection accuracy and reliability.

JP7724263B2Active Publication Date: 2025-08-15TDK CORP
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Patent Information

Application Number
JP2023130731
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-07-08
Filing Date
2023-08-10
Publication Date
2025-08-15
Estimated Expiration
2042-03-17

AI Technical Summary

Technical Problem

Magnetic sensor devices are susceptible to errors due to stress and temperature changes caused by external forces and environmental variations, which affect detection accuracy, especially in three-axis sensors where symmetrical stress distribution complicates proper mounting.

Method used

The magnetic sensor device is designed with an offset center of gravity for its element placement area relative to the reference plane, utilizing magnetoresistive elements with specific magnetization directions and a support body to mitigate stress effects, and includes a magnetic field generator to adjust free layer magnetization.

Benefits of technology

This design effectively suppresses the influence of stress on detection signals, enhancing the accuracy and reliability of magnetic sensor devices under varying environmental conditions.

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Abstract

To provide a magnetic sensor device in which influence of stress applied is suppressed.SOLUTION: A magnetic sensor device 1 comprises magnetic sensors 10, 20, 30, and a support medium 4. The center of mass of an element arrangement area of the magnetic sensors 10, 20, 30 is displaced from center of mass C4 of a reference plane 4a of the support medium 4. Each of the magnetic sensors 10, 20, 30 includes four resistance parts composed of a plurality of MR elements. Magnetization of a free layer 54 in two resistance parts contains a component in a third magnetization direction. Magnetization of the free layer 54 in each of the remaining two resistance parts contains a component in a fourth magnetization direction opposite to the third magnetization direction.SELECTED DRAWING: Figure 8
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