US 2010/0072858 A1 · VIBRATOR FOR ULTRASONIC MOTOR

Abstract

In the invention, each piezoelectric element for a vibrator for an ultrasonic motor has electrode regions for exciting stretching vibration and flexural vibration separately. Thus, the invention provides a vibrator for an ultrasonic motor, in which electrodes are provided for applying voltage to each of the polarized region, and further provides a stack-type piezoelectric vibrator for an ultrasonic motor, consisting of a stack of the said vibrators and having an extraction electrode pattern provided for short circuit with an external electrode. The vibrator of the invention has high controllability, especially in a fine movement region and is useful as a driving source in a positioning device, in which enhanced vibration efficiency can be obtained.

Claims6

Dependent claims

A vibrator for an ultrasonic motor, comprising polarized regions for separately exciting flexural vibration and stretching vibration in piezoelectric elements and an electrode provided for applying voltage signals to the polarized regions.

Dependencies are inferred from the claim text.

Facts

Application

12/236,381Filed 23 Sep 2008

Published

25 Mar 2010

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

H10N 30/202
With electrical input and mechanical output, e.g. functioning as actuators or vibrators: using longitudinal or thickness displacement combined…
H10N 30/2023
Using longitudinal or thickness displacement combined with bending, shear or torsion displacement: having polygonal or rectangular shape
H02N 2/026
Producing linear motion, e.g. actuators; Linear positioners ; Linear motors: by pressing one or more vibrators against the driven body
H10N 30/50
Piezoelectric or electrostrictive devices: having a stacked or multilayer structure

Vibrator for ultrasonic motor

Life of this patent

Vibrator for ultrasonic motor

Life of this patent

Abstract

Claims6