JP2019160873A5 - - Google Patents

Claims (12)

A piezoelectric element provided with a rectangular parallelepiped piezoelectric material, three or more electrodes, and a support member for holding the piezoelectric material.
The piezoelectric material has a primary region including one end of the piezoelectric material sandwiched between a plurality of electrodes and a secondary region including the other end.
The geometric center of the support member in the long side direction is located on the primary region side of the geometric center of the piezoelectric material, and the geometric center of the support member and the geometric center in the long side direction of the piezoelectric material. A piezoelectric element characterized in that the distance between them is 1% or more and less than 5% with respect to the long side of the piezoelectric material. The distance is, the piezoelectric element according to claim 1, wherein the at most 4.5% 2.5% or more with respect to the long side of the piezoelectric material. The piezoelectric element according to claim 2, wherein the support member is not in contact with the geometric center in the long side direction of the piezoelectric material. The piezoelectric element according to any one of claims 1 to 3 , wherein the support member is installed so as to cross the rectangular parallelepiped piezoelectric material in a direction intersecting the long side direction. The piezoelectric element according to any one of claims 1 to 4 , wherein the piezoelectric element is driven in a λ / 2 mode of longitudinal vibration in the length direction of the piezoelectric element. A piezoelectric transformer having the piezoelectric element and the exterior portion according to any one of claims 1 to 5 , wherein the piezoelectric element and the exterior portion are supported by the support member. The piezoelectric transformer according to claim 6 , wherein the piezoelectric element and the exterior portion are supported only at a position where the support member is arranged. The piezoelectric transformer according to claim 7 , wherein the electrode in the primary region is provided with a lead-out electrode via the support member. The piezoelectric element according to any one of claims 1 to 5 , or the piezoelectric transformer according to any one of claims 6 to 8.
A drive circuit that supplies an alternating voltage to the electrodes in the primary region of the piezoelectric element.
Piezoelectric transformer device equipped with. The piezoelectric transformer device according to claim 9 , wherein the drive circuit sweeps the alternating voltage in a predetermined frequency band, and the frequency band includes a resonance frequency of λ / 2 mode of longitudinal vibration of the piezoelectric element in the length direction. The piezoelectric transformer device according to claim 9 or 10 , wherein the connection between the drive circuit and the electrode on the primary side is via the support member. With electronic components
The piezoelectric element according to any one of claims 1 to 5 , the piezoelectric transformer according to any one of claims 6 to 8 , or any of claims 9 to 11 connected to the electronic component . The piezoelectric transformer device according to claim 1.
Electronic equipment with.