Displacement sensor having a piezoelectric layer comprising polylactic acid, displacement detecting device and operation device having the same

摘要

A displacement sensor having a rectangular shaped elastic member. A piezoelectric element is attached to a first main face of the elastic member. The piezoelectric element has a rectangular-shaped piezoelectric sheet and electrodes on both main faces of the piezoelectric sheet. The piezoelectric sheet is made of poly-L-lactic acid and is at least uniaxially-stretched. The piezoelectric element is attached so that the uniaxial-stretching direction of the piezoelectric sheet is 45° relative to a long-side direction of the elastic member. When the elastic member is bent along the long-side direction, the piezoelectric sheet is stretched along the long-side direction, and the piezoelectric element generates voltage of predetermined level.

主权项

1. An operation device comprising:
a flat-film-shaped piezoelectric element having a piezoelectric sheet containing polylactic acid and that was stretched at least in a uniaxial direction, and electrodes on both main faces of the piezoelectric sheet; and a casing having faces extending in two directions which are substantially orthogonal to each other in a plan view, wherein a region in which the electrodes of the flat-film-shaped piezoelectric element are opposed to each other corresponds to a position where a difference of respective distortions is greatest when the faces extending in the two directions are deformed.