Piezoelectric resonator
AssigneeMurata Manufacturing Co., Ltd.
InventorsTakashi Yamamoto, Yuko Yokoi
Life of this patent
Estimating the term…
Abstract
A piezoelectric resonator includes an internal electrode sandwiched between two layers of ceramic piezoelectric substrates each having a substantially square shape. Surface electrodes are arranged on the front surface and the back surface of the piezoelectric substrate. Both of the piezoelectric substrates are polarization-treated in the substantially perpendicular direction relative to the main surfaces and in the opposite directions with respect to the sandwiched internal electrode. When a signal voltage is applied across the surface electrodes, the piezoelectric resonator is bending-deformed so as to become convex on one side of the main surfaces and become concave on the other side thereof.
Claims10
A piezoelectric component comprising:
- a piezoelectric resonator including:
- at last two piezoelectric layers:
- an internal electrode disposed between the at least two piezoelectric layers;
- at least two surface electrode disposed on the outer main surfaces of the at least two piezoelectric layers, respectively;
- wherein
- the at least two piezoelectric layers are polarization-treated so that the polarization directions of the at least two piezoelectric layers are substantially perpendicular to the inner electrode and are opposite to each other relative to the internal electrode;
- and
- the at least two piezoelectric layers, the internal electrode and the at least two surface electrodes are arranged to cause the piezoelectric resonator to vibrate in a bending mode when a signal is applied thereto;
- a case having the piezoelectric resonator supported therein at at least two nodes or vicinities of at least two nodes of the piezoelectric resonator;
- and
- external terminals disposed on the outside of the case and electrically connected to the at least two surface electrodes of the piezoelectric resonator, respectively;
- wherein
- the piezoelectric resonator is positioned by positioning portions arranged to protrude from an inner peripheral surface of the case, at the positions thereof opposed to the respective at least two nodes or the vicinities of the at least two nodes, and a metallic spring terminal is positioned by inserting end portions of the metallic, spring terminal into concavities provided in at least a portion of said positioning portions.
Dependencies are inferred from the claim text.