Patent US4786836A successfully refreshed from Google Patents.
US4786836A
Expired / Lapsed
US
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Piezoelectric motor
Assignee: Panasonic Holdings Corp
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Filing: 1985-02-27
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Granted: 1988-11-22
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Expires: 2005-02-27
Abstract
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).
Inventors
- 👤 Akira Tokushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:55
CPC Classifications
H; H02; H02N; H02N2/00; H02N2/10; H02N2/16; H02N2/166; G; G11; G11B; G11B15/00; G11B15/18; G11B19/00; G11B19/20; G11B21/00; G11B21/02; H02N2/02; H02N2/08; H02N2/163
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
141 words
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.
Claim 2
Dependent Claim
141 words
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.
Claim 3
Dependent Claim
59 words
A piezoelectric motor in accordance with claim 1, wherein said piezoelectric vibration means has a pair of piezoelectric elements, each having regions of alternating polarizations, boundaries between regions on one piezoelectric element being disposed at positions in the vicinity of centers of regions on the other piezoelectric element, and said acoustic substance member being laminated with said piezoelectric elements.
Claim 4
Dependent Claim
24 words
A piezoelectric motor in accordance with claim 1, wherein a diameter of said vibration transmitting member is several mm to several tens of mm.
Claim 5
Dependent Claim
29 words
A piezoelectric motor in accordance with claim 1, wherein a thickness of said acoustic substance member is equal to about one hundred times a thickness of said piezoelectric element.
Claim 6
Dependent Claim
32 words
A piezoelectric motor in accordance with claim 1, wherein said vibration transmitting member is made of a material chosen from the group consisting light alloy, synthetic resin and natural and synthetic rubber.
Claim 7
Dependent Claim
35 words
A piezoelectric motor in accordance with claim 1, wherein said vibration transmitting member has a plurality of grooves of a depth of several μm to several tens μm on its face, which contact said slider.
Claim 8
Dependent Claim
15 words
A piezoelectric motor in accordance with claim 2, wherein said regions have substantially equal areas.
Claim 9
Dependent Claim
26 words
A piezoelectric motor in accordance with claim 1, wherein two electric signals having a predetermined phase difference therebetween are impressed on said two piezoelectric elements respectively.
Claim 10
Dependent Claim
29 words
A piezoelectric motor in accordance with claim 1, further comprising a shaft passing through the center of said stator perpendicular to said radial direction of said acoustic substance member.
Claim 11
Dependent Claim
32 words
A piezoelectric motor in accordance with claim 1, wherein said slider includes an elastic member which is disposed on a side of said stator and which is coupled to said acoustic substance.
Claim 12
Dependent Claim
32 words
A piezoelectric motor in accordance with claim 1, further comprising lead wires for applying an electric signal to said piezoelectric vibrating members, connected in the vicinity of a node of vibration thereof.
Claim 13
Dependent Claim
29 words
A piezoelectric motor in accordance with claim 1, wherein said vibrating member includes holding means for holding said vibrating member in the vicinity of a node of vibration thereof.
Claim 14
Dependent Claim
132 words
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.
Claim 15
Dependent Claim
132 words
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.
Claim 16
Dependent Claim
65 words
A piezoelectric linear motor in accordance with claim 13, wherein said stator has a pair of sheet-shaped piezoelectric elements, each having regions of alternating polarizations, boundaries between regions on one piezoelectric element being disposed at positions in the vicinity of centers of regions on the other piezoelectric element, and said member of acoustic substance being disposed between two neighboring piezoelectric elements to form a lamination.
Claim 17
Dependent Claim
32 words
A piezoelectric linear motor in accordance with claim 13, wherein gaps formed between parallel parts of said vibration transmitting member are of a size of several mm to several tens of mm.
Claim 18
Dependent Claim
28 words
A piezoelectric linear motor in accordance with claim 13, wherein a thickness of said vibration transmitting member is about a hundred times a thickness of said piezoelectric element.
Claim 19
Dependent Claim
33 words
A piezoelectric linear motor in accordance with claim 13, wherein said vibration transmitting member is made from a material from the group consisting of light alloy, synthetic resin or natural or synthetic rubber.
Claim 20
Dependent Claim
35 words
A piezoelectric linear motor in accordance with claim 13, wherein said vibration transmitting member has a plurality of grooves of several μm to several tens of μm depth on its face to contact said slider.
Claim 21
Dependent Claim
16 words
A piezoelectric linear motor in accordance with claim 14, wherein said regions have substantially equal areas.
Claim 22
Dependent Claim
27 words
A piezoelectric linear motor in accordance with claim 13, wherein two electric signals having a predetermined phase difference therebetween are impressed on said two piezoelectric elements respectively.
Claim 23
Dependent Claim
27 words
A piezoelectric linear motor in accordance with claim 13, wherein said stator has two shafts respectively passing near the center of the semi-oval shape of said stator.
Claim 24
Dependent Claim
32 words
A piezoelectric linear motor in accordance with claim 13, wherein said slider has an elastic member which is disposed on the side of said stator and is coupled to said acoustic substance.
Claim 25
Dependent Claim
37 words
A piezoelectric linear motor in accordance with claim 13, further comprising lead wires for applying an electric signal to said piezoelectric vibrating members, connected to said vibrating members in the vicinity of a node of vibration thereof.
Claim 26
Dependent Claim
31 words
A piezoelectric linear motor in accordance with claim 13, wherein said vibrating member has a holding means which holds said vibrating member in the vicinity of a node of vibration thereof.
Claim 27
Dependent Claim
28 words
A piezoelectric motor in accordance with claim 13 which further comprises a vibrating transmitting member of a ring shape in the vicinity of said location of maximum displacement.
Claim 28
Dependent Claim
115 words
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.
Claim 29
Dependent Claim
115 words
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.
Claim 30
Dependent Claim
32 words
A piezoelectric linear motor in accordance with claim 26, wherein a gap is formed between parallel parts of said vibration transmitting member, of a size between several mm to several tens mm.
Claim 31
Dependent Claim
28 words
A piezoelectric linear motor in accordance with claim 26, wherein thickness of said vibration transmitting member is equal to about hundred times a thickness of said piezoelectric element.
Claim 32
Dependent Claim
33 words
A piezoelectric linear motor in accordance with claim 26, wherein said vibration transmitting member is made of a material from the group consisting of light alloy, synthetic resin or natural or synthetic rubber.
Claim 33
Dependent Claim
34 words
A piezoelectric linear motor in accordance with claim 26, wherein said vibration transmitting member has a plurality of grooves of several μm to several tens μm depth on its face to contact said slider.
Claim 34
Dependent Claim
20 words
A piezoelectric linear motor in accordance with claim 26, wherein each of said piezoelectric vibrating member is of oval shape.
Claim 35
Dependent Claim
26 words
A piezoelectric linear motor in accordance with claim 26, wherein two electric signals having a predetermined phase difference therebetween are impressed on said two piezoelectric elements.
Claim 36
Dependent Claim
20 words
A piezoelectric linear motor in accordance with claim 26, further comprising a shaft passing through the center of said stator.
Claim 37
Dependent Claim
32 words
A piezoelectric linear motor in accordance with claim 26, wherein said slider has an elastic member which is disposed on the side of said stator and is coupled to said acoustic substance.
Claim 38
Dependent Claim
35 words
A piezoelectric linear motor in accordance with claim 26, further comprising lead wires for applying electric signal to said piezoelectric vibrating members and which are connected in the vicinity of a node of vibration thereof.
Claim 39
Dependent Claim
29 words
A piezoelectric linear motor in accordance with claim 26 wherein said vibrating member includes holding means for holding said vibrating member in the vicinity of node of vibration thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |