Patent ID: 9645117
Date: 2017-05-09
CPC Classifications: G01N,H01L,H03H

Claim:
1. A piezoelectric unit comprising: a piezoelectric element that causes thickness shear vibration; an electrode portion that includes a first electrode provided on one surface of the piezoelectric element, and a second electrode and a third electrode which are provided on an opposite surface to the one surface of the piezoelectric element and are electrically insulated from each other; and a switching portion that is connected to the first electrode, the second electrode, and the third electrode, and switches a connection state of each electrode, wherein the switching portion can switch a measurement mode between a mass/viscoelasticity measurement mode which is a connection state of the electrodes for measuring mass of a substance which is in contact with the piezoelectric element or viscoelasticity of a peripheral environment by causing the thickness shear vibration of the piezoelectric element, and an electrical characteristic measurement mode which is a connection state of the electrodes for measuring electrical characteristics between the second electrode and the third electrode.