CA1290000C - Ultrasonic driving device - Google Patents
Ultrasonic driving deviceInfo
- Publication number
- CA1290000C CA1290000C CA000573083A CA573083A CA1290000C CA 1290000 C CA1290000 C CA 1290000C CA 000573083 A CA000573083 A CA 000573083A CA 573083 A CA573083 A CA 573083A CA 1290000 C CA1290000 C CA 1290000C
- Authority
- CA
- Canada
- Prior art keywords
- stator
- piezoelectric vibrator
- electrodes
- driving device
- ultrasonic driving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000008093 supporting effect Effects 0.000 claims description 8
- 230000000750 progressive effect Effects 0.000 abstract description 14
- 230000002441 reversible effect Effects 0.000 abstract description 4
- 239000000919 ceramic Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 230000002250 progressing effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
- H02N2/001—Driving devices, e.g. vibrators
- H02N2/0045—Driving devices, e.g. vibrators using longitudinal or radial modes combined with torsion or shear modes
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors
- H02N2/103—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors by pressing one or more vibrators against the rotor
Abstract
ABSTRACT OF THE DISCLOSURE:
An electrode in both end portions of a piezoelectric vibra-tor is respectively divided in two, alternating current voltage is supplied to each electrode of both the end portions, whereby reversible circumferential progressive waves arise on the both the end portions or side portions of a stator consisting of the piezoelectric vibrator. A member to be driven is mounted on each one or both the end portions or the side portion of the stator.
An electrode in both end portions of a piezoelectric vibra-tor is respectively divided in two, alternating current voltage is supplied to each electrode of both the end portions, whereby reversible circumferential progressive waves arise on the both the end portions or side portions of a stator consisting of the piezoelectric vibrator. A member to be driven is mounted on each one or both the end portions or the side portion of the stator.
Description
~9~
BACKGROUND OF THE INVENTION:
The present invention relates to an ultrasonic driving ~e-vice comprising a stator consisting of a columnar t~lpe piezoelec-tric vibrator having divided electrodes in one end at least.
In a known ultrasonic motor using a piezoelectric vibrator, two groups of electrodes are attached to one end of a ring type piezoelectric ceramic vibrator, the two group of electrodes are so positioned that standing waves respectively generated by the two groups of electrodes are shifted every Tl/2 in each position ~'he parts of the ring type piezoelectric vibrator corresponding to the electrode are alternately polarized in reverse. Also, the two groups of the electrodes are respectively connected to two oscillators for respectively generating alternating current vol-tages having a Tl/2 phase shift from each other. ~Jhen the alternating current voltages from the two oscillators are respectively applied to the two groups of electrodes, the IWO
standing waves having a Tl/2 phase shift from each other generated on the surfaces of the ring type piezoelectric vibrator and then progressive waves owing to a compound of the two standing waves generated on the surfaces of the ring type piezoelectric vibrator. Therefore, when a rotary member is put on the ring type piezoelectric vibrator and the rotary member is strongly pressed to the ring type piezoelectric vibrator, the rotary member is rotated by the progressive waves.
In the prior ultrasonic motor, since the ring type piezoelectric vibrator must be polarized in many portions thereof and the two oscillators must be connected to the electrodes, Ihe construction of the ring type piezoelectric vibrator is comple~
f ~
~9~
and the cost of the ultrasonic motor becomes e~pensive.
S~MMARY OF THE INVENTION:
It is, therefore, the primary object of the present invention to provide an ultrasonic driving device having a simple construction.
It is another object of the present invention to provide an ultrasonic driving device having a stator consisting of _ columnar piezoelectric vibrator providing with divided electfodes at both ends.
It is another object of the present invention to provide an ultrasonic driving device having a stator consisting of a columnar piezoelectric vibrator in which gaps between divided electrodes in both ends are shifted from each other.
In order to accomplish the above and other object, the present invention provides a stator consisting of a piezoelect-ric vibrator having divided electrodes in both ends, and a member to driven composed on one end or a side portion of the stator, alternating current voltage being applied to two or more electrodes.
BRIEF DESCRIPTION OF THE DRAWINGS:
Fig. 1 shows a sectional view of an ultrasonic motor in the prior art.
Fig. 2 shows a plan view of a form of a piezoelectric vibrator and a composition of electrodes of the piezoelectric vibrator in the ultrasonic motor in Fig. 1.
, . .
1.~J~
Fig. 3 shows a perspective view of a stato-r of an ultrasonic d-riving device of an embodiment in the pres^-rlt invention.
Fig. 4 shows a view for explaining an operation of a stator in Fig. 3.
Fig. 5 shows a simple side view of an ultrasonic dri-~Jing device of the ernbodiment in the present invention.
Fig. 6 shows a front view of a fan of an ultrasonic driving device according to the present invention.
Fig. 7 shows a side view of the fan of Fig. 6.
Fig. 8 shows a sectional view of one part of the fan in Fig. 6.
Fig. 9 shows a side sec-tional view of a fan of the other ultrasonic driving device using according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS:
Referring to the prior art in Fig. 1, a ring type piezoelectric vibrator B is a-ttached to a ring type resilient member A and the piezoelectric vibrator B vibrates with the resilient member. The piezoelectric vibrator B is divided in 17 parts by the ratio of e.g. 22.5 or 11.25. The respective neighbouring portions in the 17 parts of -the piezoelectric vibrator B are polarized by the reverse polarity from each other as shown in Fig. 2. The two portions C and D in the one side of the piezoelectric vibrator B are respectively attached as an electrode by conductive paint as shown in Fig. 2. The portion G
in Fig. 2 shows an earth electrode. The member F to be driven to :: l ~2~
which slider E is attached is mounted on the resilient me-mber A
In the ultrasonic motor in the prior art, the altern-~ing current voltage of VOsin~t is applied to the one electrode C and the al-ternating current voltage Vocoswt is applied to the other electrode D, where V0 is ins-tantaneous value, w is radia~
frequency and t is time. The phases of these voltayes shift b~
rl/2 from each other. Thereby, the divided portions of the piezoelectric vibrator B alternately produce expansion and contraction and thus, the resilient member A produces bending ~0 vibration. Therefore, a standing wave is generated in the resilient member A and a progressive wave is generated on the resilient me~ber A. Thus, the driven member F having the slider E is rotated on the resilient member A.
However, in the prior ultrasonic motor, because the divided portions of the ring type peizoelectric vibrator B must be alternately polarized and the divided electrodes must be formed on the divided portion of the piezoelectric vibrator B, the composition of the prior ultrasonic motor is complex.
Referring to Fig. 3, in a stator consisting of a columnar piezoelectric vibrator in the embodiment of the present invention, divided electrodes 2a and 2b are provided with one end of a piezoelectric vibrator 1 and divided electrodes 3a and 3b are provided with the other end of the piezoelectric vibrator 1.
Gaps 2c and 3c are respectively formed between the divided electrodes 2a, 2b and 3a, 3b and are shift from each other (about 90 in this embodiment).
In the above stator 4, when an alternating current voltage is applied to the divided electrode 2a and elect-rod-- 3a, a circumferential progressive wave progressing in one di-rec ion arises on the end portions and side portion of the stator 4 as shown by an arrow A in Fig. 4. When an alternating CU f ren_ voltage is applied to the divided electrode 2b an electrode 3a, a, circumferential progressive wave progressing in the reverse direction arises on the end portions and side portion of che stator 4 as shown by an arrow B in Fig. 4.
Explaining the principle for generating the circumferential progressive wave on the stator 4, when the alternating current voltage having the resonance frequency of the piezoelectric vibrator 1 is applied to the electrodes 2a and 3a, since the gaps 2c and 3c are shifted by about 90, the voltage is obliquely exerted in the stator 4 as shown by an arrow C in Fig. 3.
Therefore, a thickness vibration is changed to torsion vibration in the stator 4 and a circumferential progressive wave in the direction of the arrow A may arise on the end and side portions of the stator 4 as shown in Fig. 4. When the voltage is applied to the electrodes 2b and 3b, also the circumferential progressive wave arises in the direction o-f the arrow A in the same manner as the above composition.
When the alternating current voltage having the resonance frequency of the piezoelec-tric vibrator is applied to the electrodes 2b and 3a, the voltage is obliquely exerted in Ihe stator 4 and as shown by an arrow D in Fig. 3. Therefore, a thlckness vibration is changed to a -torsion vibration in the stator 4 and circumferential progressive wave in the direction of ~o~
the arrow B may arise on the end and side portions of the stalor 4 as shown in Fig. 4. When the voltage is applied t-, _he electrodes 2a and 3b, also the circumferential prog-ressive ~lav-arises in the direction of the arrow B.
In the above instance, even if the gaps 2c and 3c are shlfted by 90~, the shift of these gaps 2c and 3c may be 45~ V-f the gaps 2c and 3c may be slightly shifted. The shift of the gaps 2c and 3c is not strictly set and the voltage may be obliquely exerted on the stator by the electrodes.
In the above ins-tance, if the gaps 2c and 3c are set in parallel and the voltage is applied to the electrodes 2a and 3a or 2a and 3b, the direction o-f the circumferential progressive wave on the stator becomes unstable, and the circumferential progressive wave generates to the arrow A or B by the slight ~S change of the frequency of the resonance of the stator 4.
Referring to Fig. 5, when a member 5 to be driven is pressed on the end portion of a stator 4 consisting of a columnar type piezoelectric vibrator, the member 5 is rotated very smoothly. Also, if the side portion of the member is pressed on the side portion of stator 4, the member 5 is rotated very smoothly.
Referring to Fig. 6, Fig. 7 and Fig. 8, a stator 4 and a supporting plate 7 are fixed with a base 6 by a screw 8. A
cylindric member 5 to be driven is mounted on a circumferential portion of the stator 4 and a stopper 10 is fixed on the end portion of the stator 4 by a screw 9. The ends of a plurality of vanes 11 are fixed on the member 5. As shown in Fig. 8, one end of each of the springs 12 is fixed on the inside of the member 5 ~9~Q
and the other end of each spring 12 is pressed on ~ne stator 4.
As shown in Fig. 3, when the alternating current ~oltage navi,~g resonance frequency of the piezoelectric vibrator is apolied to two of the electrodes 2a or 2b and 3a or 3b, the rner~er 5 i~
rotated and this device can be used as a fan.
Referring to Fig. 9, on one end of the stator 4 a cylindric supporting member 7 is fixed with a base 6 b~ a screw 8. A space is provided between the stator 4 and the cylindric supporting member 7 and a plurality of balls 13 supported by a member J to be driven are put between the stator 4 and the cylindric sup-porting member 7 and are inserted in grooves of the member 7. A
bearing 15 of the member 5 is rotatably supported by a sc-reTfl 14 fixed with the other end of the stator 4 and a plurality of vanes are fixed with the outside of the member 5.
~5 In the fan having the above composition, the balls 13 of -the member 5 are rotated by the circumferential progressive wave generated on the stator 4 and roll in the grooves of the cylindric supporting member 7. In this fan, if lubricating oil is supplied to the balls 13, the supporting member 7 and balls 13 are protected from wear. Also, since the balls 13 are contacted with the hard side portion of the piezoelectric vibrator 1 made of ceramics, the piezoelectric vibrator and its electrodes need not have protected members.
In the above embodiment, though the electrodes of the end portions of the piezoelectric vibrator 1 are respectively divided ir-l two, the electrodes may be divided in three or more and then if the alternating voltage is supplied to one or more of the electrodes at one end of the piezoelectric vibrator, the , , ~900~3~
ve can be produced on the stalor 4.circumferential progesslve wa
BACKGROUND OF THE INVENTION:
The present invention relates to an ultrasonic driving ~e-vice comprising a stator consisting of a columnar t~lpe piezoelec-tric vibrator having divided electrodes in one end at least.
In a known ultrasonic motor using a piezoelectric vibrator, two groups of electrodes are attached to one end of a ring type piezoelectric ceramic vibrator, the two group of electrodes are so positioned that standing waves respectively generated by the two groups of electrodes are shifted every Tl/2 in each position ~'he parts of the ring type piezoelectric vibrator corresponding to the electrode are alternately polarized in reverse. Also, the two groups of the electrodes are respectively connected to two oscillators for respectively generating alternating current vol-tages having a Tl/2 phase shift from each other. ~Jhen the alternating current voltages from the two oscillators are respectively applied to the two groups of electrodes, the IWO
standing waves having a Tl/2 phase shift from each other generated on the surfaces of the ring type piezoelectric vibrator and then progressive waves owing to a compound of the two standing waves generated on the surfaces of the ring type piezoelectric vibrator. Therefore, when a rotary member is put on the ring type piezoelectric vibrator and the rotary member is strongly pressed to the ring type piezoelectric vibrator, the rotary member is rotated by the progressive waves.
In the prior ultrasonic motor, since the ring type piezoelectric vibrator must be polarized in many portions thereof and the two oscillators must be connected to the electrodes, Ihe construction of the ring type piezoelectric vibrator is comple~
f ~
~9~
and the cost of the ultrasonic motor becomes e~pensive.
S~MMARY OF THE INVENTION:
It is, therefore, the primary object of the present invention to provide an ultrasonic driving device having a simple construction.
It is another object of the present invention to provide an ultrasonic driving device having a stator consisting of _ columnar piezoelectric vibrator providing with divided electfodes at both ends.
It is another object of the present invention to provide an ultrasonic driving device having a stator consisting of a columnar piezoelectric vibrator in which gaps between divided electrodes in both ends are shifted from each other.
In order to accomplish the above and other object, the present invention provides a stator consisting of a piezoelect-ric vibrator having divided electrodes in both ends, and a member to driven composed on one end or a side portion of the stator, alternating current voltage being applied to two or more electrodes.
BRIEF DESCRIPTION OF THE DRAWINGS:
Fig. 1 shows a sectional view of an ultrasonic motor in the prior art.
Fig. 2 shows a plan view of a form of a piezoelectric vibrator and a composition of electrodes of the piezoelectric vibrator in the ultrasonic motor in Fig. 1.
, . .
1.~J~
Fig. 3 shows a perspective view of a stato-r of an ultrasonic d-riving device of an embodiment in the pres^-rlt invention.
Fig. 4 shows a view for explaining an operation of a stator in Fig. 3.
Fig. 5 shows a simple side view of an ultrasonic dri-~Jing device of the ernbodiment in the present invention.
Fig. 6 shows a front view of a fan of an ultrasonic driving device according to the present invention.
Fig. 7 shows a side view of the fan of Fig. 6.
Fig. 8 shows a sectional view of one part of the fan in Fig. 6.
Fig. 9 shows a side sec-tional view of a fan of the other ultrasonic driving device using according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS:
Referring to the prior art in Fig. 1, a ring type piezoelectric vibrator B is a-ttached to a ring type resilient member A and the piezoelectric vibrator B vibrates with the resilient member. The piezoelectric vibrator B is divided in 17 parts by the ratio of e.g. 22.5 or 11.25. The respective neighbouring portions in the 17 parts of -the piezoelectric vibrator B are polarized by the reverse polarity from each other as shown in Fig. 2. The two portions C and D in the one side of the piezoelectric vibrator B are respectively attached as an electrode by conductive paint as shown in Fig. 2. The portion G
in Fig. 2 shows an earth electrode. The member F to be driven to :: l ~2~
which slider E is attached is mounted on the resilient me-mber A
In the ultrasonic motor in the prior art, the altern-~ing current voltage of VOsin~t is applied to the one electrode C and the al-ternating current voltage Vocoswt is applied to the other electrode D, where V0 is ins-tantaneous value, w is radia~
frequency and t is time. The phases of these voltayes shift b~
rl/2 from each other. Thereby, the divided portions of the piezoelectric vibrator B alternately produce expansion and contraction and thus, the resilient member A produces bending ~0 vibration. Therefore, a standing wave is generated in the resilient member A and a progressive wave is generated on the resilient me~ber A. Thus, the driven member F having the slider E is rotated on the resilient member A.
However, in the prior ultrasonic motor, because the divided portions of the ring type peizoelectric vibrator B must be alternately polarized and the divided electrodes must be formed on the divided portion of the piezoelectric vibrator B, the composition of the prior ultrasonic motor is complex.
Referring to Fig. 3, in a stator consisting of a columnar piezoelectric vibrator in the embodiment of the present invention, divided electrodes 2a and 2b are provided with one end of a piezoelectric vibrator 1 and divided electrodes 3a and 3b are provided with the other end of the piezoelectric vibrator 1.
Gaps 2c and 3c are respectively formed between the divided electrodes 2a, 2b and 3a, 3b and are shift from each other (about 90 in this embodiment).
In the above stator 4, when an alternating current voltage is applied to the divided electrode 2a and elect-rod-- 3a, a circumferential progressive wave progressing in one di-rec ion arises on the end portions and side portion of the stator 4 as shown by an arrow A in Fig. 4. When an alternating CU f ren_ voltage is applied to the divided electrode 2b an electrode 3a, a, circumferential progressive wave progressing in the reverse direction arises on the end portions and side portion of che stator 4 as shown by an arrow B in Fig. 4.
Explaining the principle for generating the circumferential progressive wave on the stator 4, when the alternating current voltage having the resonance frequency of the piezoelectric vibrator 1 is applied to the electrodes 2a and 3a, since the gaps 2c and 3c are shifted by about 90, the voltage is obliquely exerted in the stator 4 as shown by an arrow C in Fig. 3.
Therefore, a thickness vibration is changed to torsion vibration in the stator 4 and a circumferential progressive wave in the direction of the arrow A may arise on the end and side portions of the stator 4 as shown in Fig. 4. When the voltage is applied to the electrodes 2b and 3b, also the circumferential progressive wave arises in the direction o-f the arrow A in the same manner as the above composition.
When the alternating current voltage having the resonance frequency of the piezoelec-tric vibrator is applied to the electrodes 2b and 3a, the voltage is obliquely exerted in Ihe stator 4 and as shown by an arrow D in Fig. 3. Therefore, a thlckness vibration is changed to a -torsion vibration in the stator 4 and circumferential progressive wave in the direction of ~o~
the arrow B may arise on the end and side portions of the stalor 4 as shown in Fig. 4. When the voltage is applied t-, _he electrodes 2a and 3b, also the circumferential prog-ressive ~lav-arises in the direction of the arrow B.
In the above instance, even if the gaps 2c and 3c are shlfted by 90~, the shift of these gaps 2c and 3c may be 45~ V-f the gaps 2c and 3c may be slightly shifted. The shift of the gaps 2c and 3c is not strictly set and the voltage may be obliquely exerted on the stator by the electrodes.
In the above ins-tance, if the gaps 2c and 3c are set in parallel and the voltage is applied to the electrodes 2a and 3a or 2a and 3b, the direction o-f the circumferential progressive wave on the stator becomes unstable, and the circumferential progressive wave generates to the arrow A or B by the slight ~S change of the frequency of the resonance of the stator 4.
Referring to Fig. 5, when a member 5 to be driven is pressed on the end portion of a stator 4 consisting of a columnar type piezoelectric vibrator, the member 5 is rotated very smoothly. Also, if the side portion of the member is pressed on the side portion of stator 4, the member 5 is rotated very smoothly.
Referring to Fig. 6, Fig. 7 and Fig. 8, a stator 4 and a supporting plate 7 are fixed with a base 6 by a screw 8. A
cylindric member 5 to be driven is mounted on a circumferential portion of the stator 4 and a stopper 10 is fixed on the end portion of the stator 4 by a screw 9. The ends of a plurality of vanes 11 are fixed on the member 5. As shown in Fig. 8, one end of each of the springs 12 is fixed on the inside of the member 5 ~9~Q
and the other end of each spring 12 is pressed on ~ne stator 4.
As shown in Fig. 3, when the alternating current ~oltage navi,~g resonance frequency of the piezoelectric vibrator is apolied to two of the electrodes 2a or 2b and 3a or 3b, the rner~er 5 i~
rotated and this device can be used as a fan.
Referring to Fig. 9, on one end of the stator 4 a cylindric supporting member 7 is fixed with a base 6 b~ a screw 8. A space is provided between the stator 4 and the cylindric supporting member 7 and a plurality of balls 13 supported by a member J to be driven are put between the stator 4 and the cylindric sup-porting member 7 and are inserted in grooves of the member 7. A
bearing 15 of the member 5 is rotatably supported by a sc-reTfl 14 fixed with the other end of the stator 4 and a plurality of vanes are fixed with the outside of the member 5.
~5 In the fan having the above composition, the balls 13 of -the member 5 are rotated by the circumferential progressive wave generated on the stator 4 and roll in the grooves of the cylindric supporting member 7. In this fan, if lubricating oil is supplied to the balls 13, the supporting member 7 and balls 13 are protected from wear. Also, since the balls 13 are contacted with the hard side portion of the piezoelectric vibrator 1 made of ceramics, the piezoelectric vibrator and its electrodes need not have protected members.
In the above embodiment, though the electrodes of the end portions of the piezoelectric vibrator 1 are respectively divided ir-l two, the electrodes may be divided in three or more and then if the alternating voltage is supplied to one or more of the electrodes at one end of the piezoelectric vibrator, the , , ~900~3~
ve can be produced on the stalor 4.circumferential progesslve wa
Claims (6)
1. An ultrasonic driving device comprising:
a stator including a columnar piezoelectric vibrator and at least two divided electrodes at end portions of the piezoelectric vibrator, a member to be driven on one end portion or side portion of the stator, and means for supplying an alternating current voltage having a resonant frequency for producing vibration in a thickness direction of the piezoelectric vibrator, to a least two of said electrodes.
a stator including a columnar piezoelectric vibrator and at least two divided electrodes at end portions of the piezoelectric vibrator, a member to be driven on one end portion or side portion of the stator, and means for supplying an alternating current voltage having a resonant frequency for producing vibration in a thickness direction of the piezoelectric vibrator, to a least two of said electrodes.
2. An ultrasonic driving device as set forth in claim 1 wherein the electrodes include gaps which are slightly shifted from each other.
3. An ultrasonic driving device as set forth in claim 1 wherein the electrodes include gaps which are shifted by 45° from each other.
4. An ultrasonic driving device as set forth in claim 1 wherein the electrodes include gaps which are shifted by 90° from each other.
5. An ultrasonic driving device comprising:
a base, a stator including a cylindrical piezoelectric vibrator and at least two divided electrodes at end portions thereof, the stator being fixed with the base, a plate fixed with the base, a member to be driven rotatably supported at a side portion of the stator, a plurality of vanes fixed on the member, a plurality of springs, each having end end contacted with the side portion of the stator, and means for supplying an alternating current voltage having a resonant frequency for producing vibration in a thickness direction of the piezoelectric vibrator.
a base, a stator including a cylindrical piezoelectric vibrator and at least two divided electrodes at end portions thereof, the stator being fixed with the base, a plate fixed with the base, a member to be driven rotatably supported at a side portion of the stator, a plurality of vanes fixed on the member, a plurality of springs, each having end end contacted with the side portion of the stator, and means for supplying an alternating current voltage having a resonant frequency for producing vibration in a thickness direction of the piezoelectric vibrator.
6. An ultrasonic driving device comprising:
a base, a stator including a cylindrical piezoelectric vibrator and at least two divided electrodes at end portions thereof, the stator being fixed with the base, a cylindrical supporting member fixed with the base, a member to be driven rotatably supported at a side portion of the stator, a plurality of balls rotatably supported in the member to be driven and positioned between the cylindrical supporting member and the stator, a plurality of vanes fixed on the member, and means for supplying an alternating current voltage having a resonant frequency for producing vibration in a thickness direction of the piezoelectric vibrator.
a base, a stator including a cylindrical piezoelectric vibrator and at least two divided electrodes at end portions thereof, the stator being fixed with the base, a cylindrical supporting member fixed with the base, a member to be driven rotatably supported at a side portion of the stator, a plurality of balls rotatably supported in the member to be driven and positioned between the cylindrical supporting member and the stator, a plurality of vanes fixed on the member, and means for supplying an alternating current voltage having a resonant frequency for producing vibration in a thickness direction of the piezoelectric vibrator.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62187341A JP2608413B2 (en) | 1987-07-26 | 1987-07-26 | Ultrasonic drive |
| JP187341/87 | 1987-07-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1290000C true CA1290000C (en) | 1991-10-01 |
Family
ID=16204303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000573083A Expired - Fee Related CA1290000C (en) | 1987-07-26 | 1988-07-26 | Ultrasonic driving device |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4894578A (en) |
| EP (1) | EP0301429B1 (en) |
| JP (1) | JP2608413B2 (en) |
| CA (1) | CA1290000C (en) |
| DE (1) | DE3851989T2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2614635B2 (en) * | 1988-04-12 | 1997-05-28 | 日立マクセル株式会社 | Electrostrictive rotor and single-phase ultrasonic motor |
| DE68917525T2 (en) * | 1988-05-26 | 1995-01-12 | Toda Koji | Vibration type drive arrangement. |
| JP2874762B2 (en) * | 1989-06-05 | 1999-03-24 | キヤノン株式会社 | Motor drive |
| JP2935504B2 (en) * | 1989-07-05 | 1999-08-16 | キヤノン株式会社 | motor |
| US5428260A (en) * | 1990-08-03 | 1995-06-27 | Canon Kabushiki Kaisha | Vibration driven motor |
| JP2925272B2 (en) * | 1990-08-31 | 1999-07-28 | キヤノン株式会社 | Vibration wave motor |
| US5332941A (en) * | 1992-02-21 | 1994-07-26 | Honda Electronics Co., Ltd. | Ultrasonic driving motor |
| CA2303389C (en) | 1997-09-15 | 2007-07-17 | The Procter & Gamble Company | Antimicrobial quinolones, their compositions and uses |
| DE10113660A1 (en) | 2001-03-21 | 2002-09-26 | Koninkl Philips Electronics Nv | Piezoelectric drive has cylindrical piezoelectric element of stator contacted by projections of mechanical coupling released periodically for rotation of rotor |
| DE10314810A1 (en) * | 2003-01-08 | 2004-08-05 | Physik Instrumente (Pi) Gmbh & Co. Kg | Method for operating a piezoelectric motor and piezoelectric motor with a stator in the form of a hollow cylindrical oscillator |
| DE102008023478A1 (en) * | 2007-11-08 | 2009-05-14 | Physik Instrumente (Pi) Gmbh & Co. Kg | Ultrasonic linear drive with hollow cylindrical oscillator |
| DE102009049719A1 (en) * | 2009-10-17 | 2011-04-21 | Physik Instrumente (Pi) Gmbh & Co. Kg | actuator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU845198A1 (en) * | 1979-05-14 | 1981-07-07 | Каунасский Политехнический Институт Им.Ahtahaca Снечкуса | Vibromotor |
| SU1023455A1 (en) * | 1980-06-11 | 1983-06-15 | Киевский Ордена Ленина Политехнический Институт Им.50-Летия Великой Октябрьской Социалистической Революции | Piezoelectric motor |
| JPS60210172A (en) * | 1984-04-02 | 1985-10-22 | Canon Inc | Vibration wave motor |
| JPS60257777A (en) * | 1984-06-04 | 1985-12-19 | Taga Denki Kk | Twisting vibrator |
-
1987
- 1987-07-26 JP JP62187341A patent/JP2608413B2/en not_active Expired - Lifetime
-
1988
- 1988-07-20 US US07/221,719 patent/US4894578A/en not_active Expired - Lifetime
- 1988-07-22 EP EP88111831A patent/EP0301429B1/en not_active Expired - Lifetime
- 1988-07-22 DE DE3851989T patent/DE3851989T2/en not_active Expired - Fee Related
- 1988-07-26 CA CA000573083A patent/CA1290000C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0301429B1 (en) | 1994-11-02 |
| EP0301429A2 (en) | 1989-02-01 |
| JP2608413B2 (en) | 1997-05-07 |
| US4894578A (en) | 1990-01-16 |
| JPS6430478A (en) | 1989-02-01 |
| DE3851989D1 (en) | 1994-12-08 |
| DE3851989T2 (en) | 1995-03-23 |
| EP0301429A3 (en) | 1990-02-07 |
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