CA1298866C - Ultrasonic driving device - Google Patents
Ultrasonic driving deviceInfo
- Publication number
- CA1298866C CA1298866C CA000577253A CA577253A CA1298866C CA 1298866 C CA1298866 C CA 1298866C CA 000577253 A CA000577253 A CA 000577253A CA 577253 A CA577253 A CA 577253A CA 1298866 C CA1298866 C CA 1298866C
- Authority
- CA
- Canada
- Prior art keywords
- piezoelectric vibrator
- rotary member
- stator
- cylindrical piezoelectric
- divided electrodes
- 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 - Lifetime
Links
- 230000000750 progressive effect Effects 0.000 abstract description 17
- 230000002441 reversible effect Effects 0.000 abstract description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
Abstract of the Disclosure:
A stator consists of a cylindrical piezoelectric vibrator and electrodes respectively divided in two in its inside and outside portion. When alternative current voltage is applied to respective one of divided electrodes in the inside and outside portions, reversible progressive waves generate on the end and side portions of the stator. When a rotary member is combined with the end or side portion of the stator, the rotary member can reversibly be moved.
A stator consists of a cylindrical piezoelectric vibrator and electrodes respectively divided in two in its inside and outside portion. When alternative current voltage is applied to respective one of divided electrodes in the inside and outside portions, reversible progressive waves generate on the end and side portions of the stator. When a rotary member is combined with the end or side portion of the stator, the rotary member can reversibly be moved.
Description
L2~ 36~
BACKGROUND OF THE INVENTION
The present invention relates to an ultrasonic driv-ing device comprising a stator consisting of a cylindrical.
piezoelectric vibrator having divided electrodes.
In a known ultrasonic motor using a piezoelectric vibrator, two groups of elec-trodes are attached to one end of a ring type piezoelectric ceramic, the two group of electrodes are so positioned that standing waves respectively generated by the two groups of electrodes are lifted every r~/2 in each position. The parts of the ring type piezoelectric vibrator corresponding to the electrode are alternately polarized in reverse. Also, the two groups of the electrodes are respect-ively connected to two oscillators for respectively generating alternating current voltages having a ~/2 phase shift from each other. When the alternating current voltages from the two oscillators are respectively applied to the two groups of electrodes, the two standing waves having a ~/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, the composition of the ring type piezoelectric vibrator is complex and the cost of ultrasonic motor becomes expensive.
SUMMARY OF THE INVENTION:
It is, therefore, the primary object of the present invention to provide and ultrasonic driving device having a simple composition.
It is another object of the present invention to provide an ultrasonic driving device having a stator ;.
- ` ~988~;6 consisting of a cylindrical piezoelectric vibrator provided with divided electrodes in inside and outside portions there-of.
It is another object of the present invention to provide an ultrasonic driving device in which gaps between divided electrodes in the inside and outside portions are shifted from ~ach other.
In order to accomplish the above and other objects, the present invention comprises a stator having a cylindrical piezoelectric vibrator and divided electrodes in its inside and outside portions, and a rotary member composed on one end or a side portion of the stator, alternating current voltage being respectively applied-to one or more electrodes in the inside and outside portions of the cylindrical piezoelectric vibrator.
BRIEF DESCRIPTION OF THE DRAWI~GS:
Fig. 1 shows a sectional view of an ultrasonic motor in the prior art.
Fig. 2 shows a plane view of a form of a piezo-electric vibrator and a composition of electrodes of the piezoelectric vibrator in the ultrasonic motor in Fig. 1.
Fig. 3 shows a perspective view of a stator of an ultrasonic driving device in an embodiment according ko the present invention.
Fig. 4 shows a plane view of a stator in Fig. 3.
Fig. 5 shows a view for explaining the principle of motion of a stator according to the present invention in Fig.
3.
Fig. 6 shows a simple view of an ultrasonic driving device according to the present invention.
Fig.7 shows a side view of an ultrasonic driving device in the embodiment according to the present invention.
Fig. 8 shows a section view of an ultrasonic driving device in another embodiment according to the present inven-tion.
Fig. 9 shows a side sectional view of a frame of a camera using an ultrasonic driving device according to the ~, ~29E~ !366 present inventi.on.
Fig. 10 shows a sectional view taken about line A-A
in the frame of the camera in Fig. 9.
Fig. 11 shows a perspective view of a stator of an ultrasonic driving device in another embodiment according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODI~ENTS:
Referring to the prior art in Fig. 1, a ring type piezoelectric vibrator B is attached to a ring type resilient member A and the piezoelectric vibrator B vlbrates with -the resilient member. The piezoelectric vibrator B is divided in 17 parts by the ration of e.g. 22.5 or 11.25. The respect-ive neighbouri.ng portions in the 17 parts of the piezo-electric vibrator B are polarized by a reverse polarity with respect to each other as shown in Fig. 2. The two portions C
and D in one side of the piezoelectric vibrator B are respect-ively 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 which slider E is attached is mounted on the resilient member A.
In the ultrasonic motor in the prior art, the alter-nating current voltage of Vosinwt is applied to the one electrode C and the alternating current voltage Vocoswt is applied to the other electrode D, where Vo is the instant-aneous value, w is the radian frequency and t is time. The phases of these voltages shift by n/2 from each other. There-by, the divided portions of the piezoelectric vibrator B
alternately expand and contract and thus, the resilient member A has a bending vibration. Therefore, a standing wave is generated in the resilient member A and a progressive wave is generated on the resilient member A. Thus, the driven member F having the slider E is rotated on the resilient member A.
~ owever, in the prior ultrasonic motor, because the divided portion of the ring type piezoelec-tric 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 complet~.
~298~3~;6 Re~erring to Figs. 3 and ~, in a stator 4 consisting of a cylindrical piezoelectric vibrator in the embodiment ac-cording to the present invention, divided electrodes 2a and 2b are provided on the outside portion of a piezoelectric vibra-tor 1 and divided electrodes 3a and 3b are provided on the inside portion of the piezoelectric vibrator 1. Gaps 2c and 2d between the divided electrodes 2a and 2b and gaps 3c and 3d between the divided electrodes 3a, 3b are shif-ted frorn each other (about 45 in this embodiment). The shifted angle hetween gaps 2c and 3c or 2d and 3d may be 90~.
In a stator 4 of this embodiment, when alternating current voltages is applied to the electrodes 2a and 3a, a progressive wave (ellipse vibration) is generated as shown by arrow A in Fig. 5(a). Also, when alternating current voltage is applied to the electrodes 2a and 3b, a progressive wave (ellipse vibration) is reversely generated as shown by arrow B
in Fig.5(a).
Explaining this principle, one half of the cylin-drical piezoelectric vibrator is spread as shown in Fig. 5(b) and when the current voltage is applied to the outside elec-trode 2a and the inside electrode 3a, the piezoelectric vibra-tor extends toward an arrow DE and shortens toward an arrow FG. Thereby, the diametrical vibration in the cylindrical piezoelectric vibrator generates as shown in arrows H in Fig.
5(c). Therefore, since the portion o~ the piezoelectric vibrator 1, to which the alternating current voltage is ap-plied, is vibrated by the diametrical vibration and the longi-tudinal vibration, bu-t the por-tion of the piezoelectric vibra-cor to which the voltage is not applied is not vibrated, a twist vibration is generated is generated by the shift of the electrodes 2a and 3a as shown by dotted line C in Fig. 5(a) and progressive wave (ellipse vibration) generates on the end portion and a side portion of the piezoelectric vibrator 1.
Also, when the alternating current voltage is ap-plied to the electrodes 2a and 3b, the progressive wave (el-lipse vibration) generates toward the arrow B in Fig. 5(a).
~29886~i As shown in Fig 6, when a rotary mernber S is pres-sed on the end of the stator ~, the rotary member 5 is smooth-ly rotated by the progressive wave.
In this embodiment, since the rotary member is con-tacted with an end portion of the solid ceramics of the piezo-electric vibrator and the electrodes 2a, 2b, 3a and 3b are attached on the outside and inside portions, the electrodes need not be protected from wear and tear.
When the rotary member 5 is pressed on the side por-tion of the stator 4, also the rotary member 5 is smoothly rotated by the progressive wave.
When the gaps 2c and 2d between the outside elec-trodes 2a and 2b correspond with the gaps 3c and 3d between the inside electrodes 3a and 3b, the progressive wave (ellipse vibration) generates in one directi.on, but the direction of this progressive vibration is unstable.
As a concre-te embodimen-t, referring to Fig. 7, a rotary shaft 5a of the rotary member 5 is rotatably supported with a bearing 7 mounted on the end wall of the case 6 and a thrust bearing 8 between the end wall of the case 6 and the rotary member 5. The stator 4 is strongly contacted with the rotary member S by fixing a bottom plate 10 on the end of the case 6 through a spring 9.
In this embodiment, when the alternating current voltage is applied to the electrodes 2a and 3a or 3b, the pro-gressive wave (ellipse vibration) is reversibly generated on the stator 4 and thereby the rotary member 5 is rotated.
Referring to Fig.8, a plurality of balls are rotat-ably attached with the rotary member 5, the rotary shaft 5a is rotatably supported by the bearing 7 mounted on the end wall of the case 6. Then the balls are put between a plate 12 on the stator 5 and a pressure plate 13 in the case 6. I'he plate 12 of the stator 4 is strongly contacted with the balls of the rotary member 5 by fixing a bot-tom plate 10 on the end of the case 6 through a spring 9.
In this embodiment, when the alternating current voltage is applied to the electrodes 2a and 3a or 3b, the progressive wave (ellipse vibra-tion) is reversibly generated '' ~
`` 12988~;~
on the stator 4 through the plate 12. When the balls 11 are rotated by the progressive wave on -the plate 12, the balls 11 are rolled and moved on the pressure plate 13 and thereby the rotary member 5 is rotated.
Referring to Fig. 9 and Fig. 10, a frame 16 in which lenses 15 are mounted is inserted into a hole of a case 14, two projections 17a and 17b are engaged with two grooves 16a and 16b and a spiral groove 18 i.s formed on the outside of the frame 16. The ring type stator 4 is supported by projections 19 in the inside of the case 14 and a ring type rotary rnember 20 is contacted with the stator 4. A screw of a ring type flange member 22 is engaged with a screw of the case 14 and presses the rotary member 20 through a spring washer 21. A
projection 23 in the inside of the rotary member 20 is engaged with the spiral groove 18.
In the above camera having the stator 4 according to the present invention, when the alternating current voltage is applied to the stator 4 as stated above, the rotary rnember 20 is rotated by the progressive wave generated on the end of the stator 4. Since the rotary torque of the rotary member 20 is large, the frame 16 is moved toward the right or left in Fig.
9 by making moved the projection of the rotary member in the spiral groove 18. Also, since the rotary member 20 is pressed on the stator 4 with the spring washer 21, when the power is taken off, the rotary member 20 is pressed on the stator 4 with the spring washer 21, when the power is taken off, the rotary member 20 is stopped in this position. Therefore, there is no necessity for providing any mechanic member for stopping the rotary member 20.
Referring to Fig. 11, the gaps 2c and 2d between the electrodes 3a and 3b make obli~ue to the side face of the cylindrical piezoelectric vibrator 1.
In this embodiment, when the alternating current voltage is applied to the electrodes 2a and 3a or 3b, the pro-gressive wave reversibly generates on the end and side por-tions of the stator 4.
BACKGROUND OF THE INVENTION
The present invention relates to an ultrasonic driv-ing device comprising a stator consisting of a cylindrical.
piezoelectric vibrator having divided electrodes.
In a known ultrasonic motor using a piezoelectric vibrator, two groups of elec-trodes are attached to one end of a ring type piezoelectric ceramic, the two group of electrodes are so positioned that standing waves respectively generated by the two groups of electrodes are lifted every r~/2 in each position. The parts of the ring type piezoelectric vibrator corresponding to the electrode are alternately polarized in reverse. Also, the two groups of the electrodes are respect-ively connected to two oscillators for respectively generating alternating current voltages having a ~/2 phase shift from each other. When the alternating current voltages from the two oscillators are respectively applied to the two groups of electrodes, the two standing waves having a ~/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, the composition of the ring type piezoelectric vibrator is complex and the cost of ultrasonic motor becomes expensive.
SUMMARY OF THE INVENTION:
It is, therefore, the primary object of the present invention to provide and ultrasonic driving device having a simple composition.
It is another object of the present invention to provide an ultrasonic driving device having a stator ;.
- ` ~988~;6 consisting of a cylindrical piezoelectric vibrator provided with divided electrodes in inside and outside portions there-of.
It is another object of the present invention to provide an ultrasonic driving device in which gaps between divided electrodes in the inside and outside portions are shifted from ~ach other.
In order to accomplish the above and other objects, the present invention comprises a stator having a cylindrical piezoelectric vibrator and divided electrodes in its inside and outside portions, and a rotary member composed on one end or a side portion of the stator, alternating current voltage being respectively applied-to one or more electrodes in the inside and outside portions of the cylindrical piezoelectric vibrator.
BRIEF DESCRIPTION OF THE DRAWI~GS:
Fig. 1 shows a sectional view of an ultrasonic motor in the prior art.
Fig. 2 shows a plane view of a form of a piezo-electric vibrator and a composition of electrodes of the piezoelectric vibrator in the ultrasonic motor in Fig. 1.
Fig. 3 shows a perspective view of a stator of an ultrasonic driving device in an embodiment according ko the present invention.
Fig. 4 shows a plane view of a stator in Fig. 3.
Fig. 5 shows a view for explaining the principle of motion of a stator according to the present invention in Fig.
3.
Fig. 6 shows a simple view of an ultrasonic driving device according to the present invention.
Fig.7 shows a side view of an ultrasonic driving device in the embodiment according to the present invention.
Fig. 8 shows a section view of an ultrasonic driving device in another embodiment according to the present inven-tion.
Fig. 9 shows a side sectional view of a frame of a camera using an ultrasonic driving device according to the ~, ~29E~ !366 present inventi.on.
Fig. 10 shows a sectional view taken about line A-A
in the frame of the camera in Fig. 9.
Fig. 11 shows a perspective view of a stator of an ultrasonic driving device in another embodiment according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODI~ENTS:
Referring to the prior art in Fig. 1, a ring type piezoelectric vibrator B is attached to a ring type resilient member A and the piezoelectric vibrator B vlbrates with -the resilient member. The piezoelectric vibrator B is divided in 17 parts by the ration of e.g. 22.5 or 11.25. The respect-ive neighbouri.ng portions in the 17 parts of the piezo-electric vibrator B are polarized by a reverse polarity with respect to each other as shown in Fig. 2. The two portions C
and D in one side of the piezoelectric vibrator B are respect-ively 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 which slider E is attached is mounted on the resilient member A.
In the ultrasonic motor in the prior art, the alter-nating current voltage of Vosinwt is applied to the one electrode C and the alternating current voltage Vocoswt is applied to the other electrode D, where Vo is the instant-aneous value, w is the radian frequency and t is time. The phases of these voltages shift by n/2 from each other. There-by, the divided portions of the piezoelectric vibrator B
alternately expand and contract and thus, the resilient member A has a bending vibration. Therefore, a standing wave is generated in the resilient member A and a progressive wave is generated on the resilient member A. Thus, the driven member F having the slider E is rotated on the resilient member A.
~ owever, in the prior ultrasonic motor, because the divided portion of the ring type piezoelec-tric 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 complet~.
~298~3~;6 Re~erring to Figs. 3 and ~, in a stator 4 consisting of a cylindrical piezoelectric vibrator in the embodiment ac-cording to the present invention, divided electrodes 2a and 2b are provided on the outside portion of a piezoelectric vibra-tor 1 and divided electrodes 3a and 3b are provided on the inside portion of the piezoelectric vibrator 1. Gaps 2c and 2d between the divided electrodes 2a and 2b and gaps 3c and 3d between the divided electrodes 3a, 3b are shif-ted frorn each other (about 45 in this embodiment). The shifted angle hetween gaps 2c and 3c or 2d and 3d may be 90~.
In a stator 4 of this embodiment, when alternating current voltages is applied to the electrodes 2a and 3a, a progressive wave (ellipse vibration) is generated as shown by arrow A in Fig. 5(a). Also, when alternating current voltage is applied to the electrodes 2a and 3b, a progressive wave (ellipse vibration) is reversely generated as shown by arrow B
in Fig.5(a).
Explaining this principle, one half of the cylin-drical piezoelectric vibrator is spread as shown in Fig. 5(b) and when the current voltage is applied to the outside elec-trode 2a and the inside electrode 3a, the piezoelectric vibra-tor extends toward an arrow DE and shortens toward an arrow FG. Thereby, the diametrical vibration in the cylindrical piezoelectric vibrator generates as shown in arrows H in Fig.
5(c). Therefore, since the portion o~ the piezoelectric vibrator 1, to which the alternating current voltage is ap-plied, is vibrated by the diametrical vibration and the longi-tudinal vibration, bu-t the por-tion of the piezoelectric vibra-cor to which the voltage is not applied is not vibrated, a twist vibration is generated is generated by the shift of the electrodes 2a and 3a as shown by dotted line C in Fig. 5(a) and progressive wave (ellipse vibration) generates on the end portion and a side portion of the piezoelectric vibrator 1.
Also, when the alternating current voltage is ap-plied to the electrodes 2a and 3b, the progressive wave (el-lipse vibration) generates toward the arrow B in Fig. 5(a).
~29886~i As shown in Fig 6, when a rotary mernber S is pres-sed on the end of the stator ~, the rotary member 5 is smooth-ly rotated by the progressive wave.
In this embodiment, since the rotary member is con-tacted with an end portion of the solid ceramics of the piezo-electric vibrator and the electrodes 2a, 2b, 3a and 3b are attached on the outside and inside portions, the electrodes need not be protected from wear and tear.
When the rotary member 5 is pressed on the side por-tion of the stator 4, also the rotary member 5 is smoothly rotated by the progressive wave.
When the gaps 2c and 2d between the outside elec-trodes 2a and 2b correspond with the gaps 3c and 3d between the inside electrodes 3a and 3b, the progressive wave (ellipse vibration) generates in one directi.on, but the direction of this progressive vibration is unstable.
As a concre-te embodimen-t, referring to Fig. 7, a rotary shaft 5a of the rotary member 5 is rotatably supported with a bearing 7 mounted on the end wall of the case 6 and a thrust bearing 8 between the end wall of the case 6 and the rotary member 5. The stator 4 is strongly contacted with the rotary member S by fixing a bottom plate 10 on the end of the case 6 through a spring 9.
In this embodiment, when the alternating current voltage is applied to the electrodes 2a and 3a or 3b, the pro-gressive wave (ellipse vibration) is reversibly generated on the stator 4 and thereby the rotary member 5 is rotated.
Referring to Fig.8, a plurality of balls are rotat-ably attached with the rotary member 5, the rotary shaft 5a is rotatably supported by the bearing 7 mounted on the end wall of the case 6. Then the balls are put between a plate 12 on the stator 5 and a pressure plate 13 in the case 6. I'he plate 12 of the stator 4 is strongly contacted with the balls of the rotary member 5 by fixing a bot-tom plate 10 on the end of the case 6 through a spring 9.
In this embodiment, when the alternating current voltage is applied to the electrodes 2a and 3a or 3b, the progressive wave (ellipse vibra-tion) is reversibly generated '' ~
`` 12988~;~
on the stator 4 through the plate 12. When the balls 11 are rotated by the progressive wave on -the plate 12, the balls 11 are rolled and moved on the pressure plate 13 and thereby the rotary member 5 is rotated.
Referring to Fig. 9 and Fig. 10, a frame 16 in which lenses 15 are mounted is inserted into a hole of a case 14, two projections 17a and 17b are engaged with two grooves 16a and 16b and a spiral groove 18 i.s formed on the outside of the frame 16. The ring type stator 4 is supported by projections 19 in the inside of the case 14 and a ring type rotary rnember 20 is contacted with the stator 4. A screw of a ring type flange member 22 is engaged with a screw of the case 14 and presses the rotary member 20 through a spring washer 21. A
projection 23 in the inside of the rotary member 20 is engaged with the spiral groove 18.
In the above camera having the stator 4 according to the present invention, when the alternating current voltage is applied to the stator 4 as stated above, the rotary rnember 20 is rotated by the progressive wave generated on the end of the stator 4. Since the rotary torque of the rotary member 20 is large, the frame 16 is moved toward the right or left in Fig.
9 by making moved the projection of the rotary member in the spiral groove 18. Also, since the rotary member 20 is pressed on the stator 4 with the spring washer 21, when the power is taken off, the rotary member 20 is pressed on the stator 4 with the spring washer 21, when the power is taken off, the rotary member 20 is stopped in this position. Therefore, there is no necessity for providing any mechanic member for stopping the rotary member 20.
Referring to Fig. 11, the gaps 2c and 2d between the electrodes 3a and 3b make obli~ue to the side face of the cylindrical piezoelectric vibrator 1.
In this embodiment, when the alternating current voltage is applied to the electrodes 2a and 3a or 3b, the pro-gressive wave reversibly generates on the end and side por-tions of the stator 4.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An ultrasonic driving device comprising:
a stator including a cylindrical piezoelectric vibrator;
inner divided electrodes secured to an inside por-tion of the cylindrical piezoelectric vibrator, with first gaps therebetween;
outer divided electrodes secured to an outside por-tion of the cylindrical piezoelectric vibrator, with second gaps therebetween;
said first and second gaps being shift from each other;
an alternating current (AC) power supply connected to respective ones of the divided electrodes on the inside and outside portions of the cylindrical piezoelectric vibrator;
and a rotary member combined with an end or side portion of the stator.
a stator including a cylindrical piezoelectric vibrator;
inner divided electrodes secured to an inside por-tion of the cylindrical piezoelectric vibrator, with first gaps therebetween;
outer divided electrodes secured to an outside por-tion of the cylindrical piezoelectric vibrator, with second gaps therebetween;
said first and second gaps being shift from each other;
an alternating current (AC) power supply connected to respective ones of the divided electrodes on the inside and outside portions of the cylindrical piezoelectric vibrator;
and a rotary member combined with an end or side portion of the stator.
2. An ultrasonic driving device comprising:
a stator including a cylindrical piezoelectric vibrator;
inner divided electrodes secured to an inside por-tion of the cylindrical piezoelectric vibrator, with first gaps therebetween;
outer divided electrodes secured to an outside por-tion of the cylindrical piezoelectric vibrator, with second gaps therebetween;
said first and second gaps being shifted from each other by 45°;
an alternating current (AC) power supply connected to respective ones of the divided electrodes on the inside and outside portions of the cylindrical piezoelectric vibrator;
and a rotary member combined with an end or side portion of the stator.
a stator including a cylindrical piezoelectric vibrator;
inner divided electrodes secured to an inside por-tion of the cylindrical piezoelectric vibrator, with first gaps therebetween;
outer divided electrodes secured to an outside por-tion of the cylindrical piezoelectric vibrator, with second gaps therebetween;
said first and second gaps being shifted from each other by 45°;
an alternating current (AC) power supply connected to respective ones of the divided electrodes on the inside and outside portions of the cylindrical piezoelectric vibrator;
and a rotary member combined with an end or side portion of the stator.
3. An ultrasonic driving device comprising:
a stator including a cylindrical piezoelectric vibrator;
inner divided electrodes secured to an inside por-tion of the cylindrical piezoelectric vibrator, with first gaps therebetween;
outer divided electrodes secured to an outside por-tion of the cylindrical piezoelectric vibrator, with second gaps therebetween;
said first and second gaps being shifted from each other by 90°;
an alternating current (AC) power supply connected to respective one of the divided electrodes on the inside and outside portions of the cylindrical piezoelectric vibrator;
and a rotary member combined with an end or side portion of the stator.
a stator including a cylindrical piezoelectric vibrator;
inner divided electrodes secured to an inside por-tion of the cylindrical piezoelectric vibrator, with first gaps therebetween;
outer divided electrodes secured to an outside por-tion of the cylindrical piezoelectric vibrator, with second gaps therebetween;
said first and second gaps being shifted from each other by 90°;
an alternating current (AC) power supply connected to respective one of the divided electrodes on the inside and outside portions of the cylindrical piezoelectric vibrator;
and a rotary member combined with an end or side portion of the stator.
4. An ultrasonic driving device comprising:
a stator including a cylindrical piezoelectric vibrator;
inner divided electrodes secured to an inside por-tion of the cylindrical piezoelectric vibrator, with first gaps therebetween;
outer divided electrodes secured to an outside por-tion of the cylindrical piezoelectric vibrator, with second gaps therebetween;
said first and second gaps being shifted from each being oblique;
an alternating current (AC) power supply connected to respective one of the divided electrodes on the inside and outside portions of the cylindrical piezoelectric vibrator;
and a rotary member combined with an end or side portion of the stator.
a stator including a cylindrical piezoelectric vibrator;
inner divided electrodes secured to an inside por-tion of the cylindrical piezoelectric vibrator, with first gaps therebetween;
outer divided electrodes secured to an outside por-tion of the cylindrical piezoelectric vibrator, with second gaps therebetween;
said first and second gaps being shifted from each being oblique;
an alternating current (AC) power supply connected to respective one of the divided electrodes on the inside and outside portions of the cylindrical piezoelectric vibrator;
and a rotary member combined with an end or side portion of the stator.
5. An ultrasonic driving device according to claim 1, further comprising:
a case having bearing means therein, a rotary member having a rotary shaft rotably sup-ported with the bearing means in the case;
a thrust bearing positioned between an inside por-tion of the case and rotary member, and wherein said stator is in contact with the rotary member.
a case having bearing means therein, a rotary member having a rotary shaft rotably sup-ported with the bearing means in the case;
a thrust bearing positioned between an inside por-tion of the case and rotary member, and wherein said stator is in contact with the rotary member.
6. An ultrasonic driving device according to claim 1, further comprising:
a case having bearing means therein;
a rotary member having a rotary shaft rotably sup-ported by said bearing means and a plurality of balls rotably supported therein;
a thrust plate positioned between an inside portion of the case and the balls of the rotary member; and wherein said stator is in contact with the balls of the rotary member.
a case having bearing means therein;
a rotary member having a rotary shaft rotably sup-ported by said bearing means and a plurality of balls rotably supported therein;
a thrust plate positioned between an inside portion of the case and the balls of the rotary member; and wherein said stator is in contact with the balls of the rotary member.
7. An ultrasonic driving device according to claim 1, further comprising:
a case having projections;
a ring tight rotary member rotably supported in the case;
a spring washer in the case;
a flange member which presses the ring-type rotary member through the spring washer;
a cylindrical frame having lenses, a side portion with grooves therein which receive the projections of the case for supporting the cylindrical frame, and a spiral groove on an outside portion of the frame engaged with a projection of the ring-type rotary member, such that the cylindrical frame is axially moved when the rotary member is rotated by the stator; and wherein said stator is supported by the projections in the case.
a case having projections;
a ring tight rotary member rotably supported in the case;
a spring washer in the case;
a flange member which presses the ring-type rotary member through the spring washer;
a cylindrical frame having lenses, a side portion with grooves therein which receive the projections of the case for supporting the cylindrical frame, and a spiral groove on an outside portion of the frame engaged with a projection of the ring-type rotary member, such that the cylindrical frame is axially moved when the rotary member is rotated by the stator; and wherein said stator is supported by the projections in the case.
8. An ultrasonic driving device comprising:
a stator including a cylindrical piezoelectric vibrator;
inner divided electrodes secured to an inside por-tion of the cylindrical piezoelectric vibrator, with first gaps therebetween;
outer divided electrodes secured to an outside por-tion of the cylindrical piezoelectric vibrator, with second gaps therebetween;
said first and second gaps being shifted from each other and said first and second gaps extending in a direction having an axial component;
an alternating current (AC) power supply connected to respective ones of the divided electrodes on the inside and outside portions of the cylindrical piezoelectric vibrator;
and a rotary member combined with an end or side portion of the stator.
a stator including a cylindrical piezoelectric vibrator;
inner divided electrodes secured to an inside por-tion of the cylindrical piezoelectric vibrator, with first gaps therebetween;
outer divided electrodes secured to an outside por-tion of the cylindrical piezoelectric vibrator, with second gaps therebetween;
said first and second gaps being shifted from each other and said first and second gaps extending in a direction having an axial component;
an alternating current (AC) power supply connected to respective ones of the divided electrodes on the inside and outside portions of the cylindrical piezoelectric vibrator;
and a rotary member combined with an end or side portion of the stator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000577253A CA1298866C (en) | 1988-09-13 | 1988-09-13 | Ultrasonic driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000577253A CA1298866C (en) | 1988-09-13 | 1988-09-13 | Ultrasonic driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1298866C true CA1298866C (en) | 1992-04-14 |
Family
ID=4138715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000577253A Expired - Lifetime CA1298866C (en) | 1988-09-13 | 1988-09-13 | Ultrasonic driving device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1298866C (en) |
-
1988
- 1988-09-13 CA CA000577253A patent/CA1298866C/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 20030414 |