Patent ID: 11971315
Assignee: DAEGU GYEONGBUK INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 13:
14. A force sensor, comprising:
a support layer having elasticity;
a plurality of permanent magnet layers comprising a first permanent magnet layer; and a second permanent magnet layer disposed on first permanent magnet layer such that a central region between the first permanent magnet layer and the second permanent magnet layer is spaced; and
a magnetic tunnel junction disposed on the central region of the first permanent magnet layer and configured to have a preset resistance value; and
fixation members disposed on opposite ends of a lower part of the support layer to fix opposite ends of the permanent magnet layers,
wherein each of the permanent magnet layers is formed in a thin membrane shape, a partial region, to which a pressure is applied from outside, of the support layer moves in a direction of the permanent magnet layers, opposite ends, on which the fixation members are disposed, of the support layer move in a direction opposite to the direction, spaces of the central region of the permanent magnet layers are reduced according to a movement to the support layer, a magnetic field strength formed at the central region is formed to a preset strength or more as the spaces are reduced, the preset resistance value of the magnetic tunnel junction is changed by the magnetic field strength formed to the preset strength or more, and the pressure is sensed based on a change in the preset resistance value.