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US 4,786,836 AGranted
Piezoelectric motor
AssigneeMatsushita Electric Industrail Co., Ltd.
InventorAkira Tokushima
Life of this patent
Estimating the term…
Abstract
A piezoelectric motor or a piezoelectric linear motor comprises a stator (44) having two piezoelectric vibrating members (38, 39) and a substrate (40) which is made of an acoustic substance and has vibration transmitting member (41), and sliders (55, 56) which contact a vibration transmitting member (41) formed on said stator (44) at parts of maximum displacement of the stator (44).
Claims36
A piezoelectric motor comprising:
- a ring-shaped stator having:
- (a) an acoustic substance member of a circular configuration, and (b) piezoelectric vibrating means coupled to said acoustic substance member for generating a bending vibration wave travelling in a circumferential direction on said member;
- a circular vibration transmitting member formed on said stator, the location of which member in a radial direction of said stator is adjacent to a portion at which the displacement of said stator due to said bending travelling wave is maximum in said radial direction;
- a slider disposed with a contact surface thereof facing said stator, so as to contact with said vibration transmitting member, thereby receiving a friction driving force in a direction substantially parallel to a face of said stator;
- and
- supporting means for supporting said stator in the vicinity of a node of said vibration thereof.
3 more elements
A piezoelectric linear motor comprising:
- a stator having:
- (a) an acoustic substance member of an oval configuration having a radial direction defined by a radius of said member and (b) piezoelectric vibrating means coupled to said acoustic substance member for generating a bending vibration wave travelling in a circumferential direction on said member;
- a vibration transmitting member formed on said stator in an oval shape, which is disposed parallel to said radial direction adjacent a contact portion of said stator at which a maximum displacement of said stator due to said bending travelling wave occurs;
- and
- a slider disposed with a contact surface thereof facing said stator, so as to contact said vibration transmitting member, to receive a friction driving force in a direction substantially parallel to a face of said stator.
2 more elements
A piezoelectric linear motor comprising:
- a stator which has a face which undergoes displacement from a rest position at different locations thereof, and having:
- (a) at least two piezoelectric vibrating members, and (b) at least one member formed of an acoustic substance;
- a slider disposed adjacent said stator, and which contacts said stator at a friction contact location, which friction contact occurs at a location of said stator face which is undergoing maximum displacement from said rest position, to render a motion to said slider in a direction substantially parallel to said face of said stator;
- and
- a vibration transmitting member of an oval shape, disposed in the vicinity of said location of maximum displacement.
2 more elements
Dependencies are inferred from the claim text.