Vibration wave driving apparatus, vibration member and driving system for the vibration wave driving apparatus

a technology of vibration member and driving apparatus, which is applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, piezoelectric/electrostrictive/magnetostriction machines, etc., can solve the problem of lowering the output of ultrasonic motors and the inability to ensure the electrode region of a sensor phase for detecting the vibration of the vibration

Inactive Publication Date: 2005-10-04
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the vibration amplitudes of the travelling wave obtained by synthesizing the first standing wave and the second standing wave are caused to be different from each other depending on the portions of the elastic member, thereby lowering the output of the ultrasonic motor.
Also, in the structure shown in FIG. 10, the electrode region of a sensor phase for detecting the vibration of the vibration member cannot be ensured.

Method used

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Embodiment Construction

[0048]Now, a description will be given in more detail of preferred embodiments of the present invention with reference to the accompanying drawings.

[0049]FIG. 1 is a cross-sectional view showing an ultrasonic motor which is an example of a vibration wave driving apparatus. Reference numeral 11 denotes an elastic member which is made of metal or the like and structures a vibration member, and a piezoelectric element 12 is fixed to a bottom surface of the elastic member 11 as an electro-mechanical energy conversion element shown in FIG. 11. A frictional material 15 made of resin is stuck onto an opposite surface of the elastic member 11 to the piezoelectric element 12 and the elastic member 11 is fixed to a motor housing 20 by screws 22.

[0050]Reference numeral 16 denotes a rotor as a moving member which is in contact with the frictional material 15 of vibration member and made of metal whose surface is subjected to a hardening process. The rotor 16 is urged against the elastic member ...

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Abstract

The present invention relates to a vibration wave driving apparatus including: a vibration member which has an electro-mechanical energy conversion element having a plurality of electrode regions that are fixed to an elastic member and polarized in the same direction, and which generates a travelling wave that is obtained by synthesizing a plurality of standing waves different in phase on a surface of the elastic member by supplying an ac signal to the electro-mechanical energy conversion element; and a moving member which is in contact with the vibration member and driven by the travelling wave. The vibration wave driving apparatus of the present invention is characterized in that a plurality of wiring members are connected to a plurality of electrode regions of the electro-mechanical energy conversion element, and that wiring members used for generating standing waves having the same phase among the plurality of wiring members are arranged at intervals integer times the wavelength of the standing waves having the same phase.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a vibration wave driving apparatus such as an ultrasonic motor which generates a vibration in an elastic member and gives a driving force to a moving member that is in contact with the elastic member by using the vibration in the elastic member, and a driving circuit therefore.[0003]2. Related Background Art[0004]An ultrasonic wave motor, which is one of the vibration wave driving apparatuses and which generates a travelling wave in an elastic member constructing a stator, generates a plurality of standing waves, each having a different phase, in the stator constructed of the elastic member and a piezoelectric element, and compose the standing waves to generate the traveling wave.[0005]FIG. 8 shows an electrode pattern of a piezoelectric element disposed on an annular stator of the ultrasonic motor. An electrode region at a substantially right half side of FIG. 8 shows a first electrode ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01L41/04H01L41/09H02N2/00H02N2/16
CPCH02N2/14H02N2/163
Inventor YAMAMOTO, SHINJI
Owner CANON KK
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