Title:
超音波モータ及び超音波モータ付き電子機器
Document Type and Number:
Japanese Patent JP4053762
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an ultrasonic motor which will not vary by a large amount in the frequency-admittance characteristics of the stator thereof, delivers high output, and is of a reduced size, by make the frequency value at a resonance point where the admittance value is minimized deviate from the frequency value at adjacent resonance points. SOLUTION: In the ultrasonic motor, two elastic members, placed in upper and lower positions, are provided with grooves which are formed at an angle of less than 90 deg.. Grooves are formed at nodes of standing waves, on which stress is concentrated so that great torsional displacement, is produced. The grooves are formed in positions other than the upper face or lower face of the elastic members. A piezoelectric element is placed in the elastic members, having in at least part thereof the grooves, which are formed at an angle of less than 90 deg., in the vertical direction. A plurality of the grooves are formed at a fixed angle. The grooves are spirally formed throughout the circumference of the elastic bodies by one or more turns. The grooves are formed, so that the grooves are symmetrically positioned on both sides of the center of the stator in the direction of length at the identical angle.
Inventors:
Akihiro Iino
Saint watanabe
Masao Kasuga
Saint watanabe
Masao Kasuga
Application Number:
JP2001345243A
Publication Date:
February 27, 2008
Filing Date:
November 09, 2001
Export Citation:
Assignee:
Seiko Instruments Inc.
International Classes:
H01L41/09; H02N2/00
Domestic Patent References:
| JP2164284A | ||||
| JP7075352A | ||||
| JP11220891A | ||||
| JP10285964A |
Attorney, Agent or Firm:
Yoshiharu Matsushita