Back to results
US 4,788,468 AGranted
Vibration wave motor
AssigneeCanon Kabushiki Kaisha
InventorsKazuhiro Izukawa, Ichiro Okumura
Life of this patent
Estimating the term…
Abstract
In a vibration wave motor for driving a movable member which contacts with a vibration member which in turn contacts an electrostrictive element, by a travelling vibration wave generated in the vibration member by applying periodic voltages to the electrostrictive element, the periodic voltages are applied to the electrostrictive element in the same direction as the amplitude direction of the travelling vibration wave to obtain a longitudinal effect so that drive efficiency is improved.
Claims15
A vibration wave motor comprising:
- (a) a vibration member having electrostrictive elements on one side surface thereof, and a plurality of electrodes arranged on the surface on which said electrostrictive elements are arranged with a predetermined space therebetween, said electrostrictive elements being polarized in a direction from on electrode to another electrode;
- (b) periodic signal applying means for applying a periodic signal to said electrodes to generate an electric field on said electrostrictive elements between said electrodes in a direction from one electrode to another electrode;
- and
- (c) a movable member driven by a progressive wave generated on the other side surface of said vibration member.
1 more element
A vibration wave motor comprising:
- (a) a vibration member;
- (b) a plurality of electrostrictive element portions arranged on one side surface of said vibration member, wherein each portion is polarized in a direction along said one side surface of said vibration member;
- (c) a plurality of electrodes arranged on said electrostrictive element portions in said polarization direction;
- (d) periodic signal applying means for applying a periodic signal to said electrodes to generate an electric field in said electrostrictive element portions between said electrodes substantially along the direction of polarization of said electrostrictive element portions;
- and
- (e) a movable member driven by a progressive wave generated on the other side surface of said vibration member.
3 more elements
A vibration wave motor comprising:
- (a) a vibration member;
- (b) a plurality of electrostrictive element portions arranged on one side surface of said vibration member, each being polarized in a direction along said one side surface of said vibration member;
- (c) a plurality of electrodes arranged on said electrostrictive element portions in the direction of the polarization thereof;
- (d) periodic signal applying means for applying a periodic signal to generate an electric field in each of said electrostrictive element portions between the electrodes substantially along the direction of the polarization thereof;
- and
- (e) a movable member driven by a progressive wave generated on the other side surface of said vibration member.
3 more elements
Dependencies are inferred from the claim text.