Patent ID: 9342179
Filing Date: 2016-05-17
CPC Classification: A61B,G01L,G06F,H04R

Claim Text:
1. A strain sensing element comprising: a film unit having a film surface and being deformable; and a sensing unit including a first sensing element and a second sensing element, the first sensing element being provided between a part of the film unit and the second sensing element, the first sensing element including a first magnetic layer, a second magnetic layer provided apart from the first magnetic layer in a first direction crossing the film surface, and a first spacer layer provided between the first magnetic layer and the second magnetic layer, a magnetization of the first magnetic layer being configured to change in accordance with a deformation of the film unit, the second sensing element including a third magnetic layer, a fourth magnetic layer provided apart from the third magnetic layer in the first direction, and a second spacer layer provided between the third magnetic layer and the fourth magnetic layer, a magnetization of the third magnetic layer being configured to change in accordance with the deformation of the film unit, wherein a magnetization of the second magnetic layer and a magnetization of the fourth magnetic layer are fixed, the fourth magnetic layer is disposed between the third magnetic layer and the film unit, and the second magnetic layer is disposed between the first magnetic layer and the film unit.