Patent ID: 11940299
Assignee: MULTIDIMENSION TECHNOLOGY CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A magnetoresistive inertial sensor chip, comprising:
a substrate,
a vibrating diaphragm,
a magnetic field sensing magnetoresistor, and
at least one permanent magnet thin film, wherein
the vibrating diaphragm is located on one side surface of the substrate, the magnetic field sensing magnetoresistor and the permanent magnet thin film are set on the surface of the vibrating diaphragm away from the base of the substrate, a contact electrode is also arranged on the surface of the vibrating diaphragm away from the base of the substrate, and the magnetic field sensing magnetoresistor is connected to the contact electrode through a connecting lead; and
the substrate comprises a cavity formed through etching, either one or both of the magnetic field sensing magnetoresistor and the permanent magnet thin film are arranged in a vertical projection area of the cavity on the vibrating diaphragm, and a component of a magnetic field generated by the permanent magnet thin film in a sensitivity direction of the magnetic field sensing magnetoresistor changes, causing the resistance value of the magnetic field sensing magnetoresistor to change, thereby leading to a change in an output electric signal.