JPH04109875A - Ultrasonic motor - Google Patents

Ultrasonic motor

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Publication number
JPH04109875A
JPH04109875A JP2224258A JP22425890A JPH04109875A JP H04109875 A JPH04109875 A JP H04109875A JP 2224258 A JP2224258 A JP 2224258A JP 22425890 A JP22425890 A JP 22425890A JP H04109875 A JPH04109875 A JP H04109875A
Authority
JP
Japan
Prior art keywords
vibrating body
vibrating
vibrator
vibration
contact
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.)
Pending
Application number
JP2224258A
Other languages
Japanese (ja)
Inventor
Yoshimi Kikuchi
良巳 菊池
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Instruments Corp
Original Assignee
Sankyo Seiki Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sankyo Seiki Manufacturing Co Ltd filed Critical Sankyo Seiki Manufacturing Co Ltd
Priority to JP2224258A priority Critical patent/JPH04109875A/en
Publication of JPH04109875A publication Critical patent/JPH04109875A/en
Pending legal-status Critical Current

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  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)

Abstract

PURPOSE:To accelerate by securing one of ends of a vibrator in a vibrating direction in the vibrating direction, supporting the other end side movably to the vibrating direction, and energizing the entire vibrator to a moving body from a direction perpendicular to the vibrating direction. CONSTITUTION:A reverse side X1 to an edge X in contact with a moving body 5 of the side of a vibrator 1 in a telescopically vibrating direction is supported by support means 6 for so controlling it as not to move in the telescopically vibrating direction. Further, a reverse side X2 to a side having the edge X in contact with the body 5 of the side perpendicular to the side of the telescopically vibrating direction of the vibrator 1 is supported by energizing means 7 for supporting it movably to the vibrating direction and pressing the vibrator 1 to the body 5 side. Thus, a deviation originally generated at the fixed end side of the vibrator is added to the end in contact with the free end side, i.e., the body, i.e., about twice, and the speed becomes about twice.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、超音波モータに関する。更に詳述すると、本
発明は、超音波モータの変位量と移動速度を増幅させる
構造に関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an ultrasonic motor. More specifically, the present invention relates to a structure for amplifying the displacement and moving speed of an ultrasonic motor.

(従来の技術) 超音波振動子の往復運動を利用して移動体を移動させる
超音波モータの1つとして、振動体の長手方向に伸縮す
るような振動の定在波を利用したものは例えば特公昭5
9−37672号公報において公知である。
(Prior Art) As one type of ultrasonic motor that moves a moving object using the reciprocating motion of an ultrasonic vibrator, there is an example of an ultrasonic motor that uses a standing wave of vibration that expands and contracts in the longitudinal direction of the vibrator. Tokuko Showa 5
It is publicly known in the publication No. 9-37672.

この定在波型超音波モータの振動体101の取付は方法
は、第6図(A)に示すように、振動体101の振動変
位が最も少ない部位Sに固定部を定め、2軸方向(x−
y)に固定しているのが常識である。また、この振動体
101は、第6図(B)に示すように、防振部材102
等を用いて筐体枠(図示省略)に取付けられ、振動が筐
体枠に伝達しないように構成されている。即ち、振動体
は筐体に対し弾性支持されている。尚、符号103は超
音波振動子である。
The method of mounting the vibrating body 101 of this standing wave type ultrasonic motor is as shown in FIG. x-
It is common sense to fix it at y). Further, as shown in FIG. 6(B), this vibrating body 101 has a vibration isolating member 102.
It is attached to a housing frame (not shown) using a screw or the like, and is configured so that vibrations are not transmitted to the housing frame. That is, the vibrating body is elastically supported by the housing. Note that the reference numeral 103 is an ultrasonic transducer.

(発明が解決しようとする課題) このため、従来の定在波型超音波モータでは、移動体1
01の変位は、実質的に固定点Sから自由端Fまでの間
の領域F1で起るため、変位量を大きくとることができ
ないし、結局移動速度も速くできない問題がある。
(Problem to be solved by the invention) For this reason, in the conventional standing wave type ultrasonic motor, the moving body 1
Since the displacement of 01 substantially occurs in the area F1 between the fixed point S and the free end F, there is a problem that the amount of displacement cannot be large and the moving speed cannot be increased.

本発明は、従来よりも変位量を大きくし、かつ速度を上
げ得る超音波モータを提供することを目的とする。
SUMMARY OF THE INVENTION An object of the present invention is to provide an ultrasonic motor capable of increasing displacement and speed compared to conventional motors.

(課題を解決するための手段) かかる目的を達成するため、本発明の超音波モータは、
交番信号が印加されて#縮するように振動する振動体と
、該振動体を振動させる駆動回路と、上記振動体の一方
の端部に接触する移動体と、上記振動体の上記伸縮方向
の端部であって上記移動体と接する端部とは逆の端部を
伸縮方向に移動しないように規制する支持手段と、上記
振動体の上記伸縮方向と平行な面を上記伸縮方向には移
動自在に支持すると共に当該振動体を上記移動体側に押
しつける付勢手段とを備え、上記振動体の伸縮移動によ
って上記振動体の端部に接する移動体を一方向に移動さ
せるようにしている。
(Means for Solving the Problem) In order to achieve the above object, the ultrasonic motor of the present invention has the following features:
A vibrating body that vibrates to contract when an alternating signal is applied, a drive circuit that vibrates the vibrating body, a moving body that contacts one end of the vibrating body, and a movable body that vibrates in the direction of expansion and contraction of the vibrating body. a support means for restricting an end opposite to the end in contact with the movable body from moving in the expansion/contraction direction; and a support means for restricting the vibrating body from moving in the expansion/contraction direction in a plane parallel to the expansion/contraction direction. A biasing means for freely supporting the vibrating body and pressing the vibrating body toward the movable body is provided, and the movable body in contact with the end of the vibrating body is moved in one direction by the expansion and contraction movement of the vibrating body.

(作用) したがって、振動体は、伸縮振動する時に、移動体と接
触する振動体の端部とは逆の端部において伸縮方向への
移動が規制されているため自由端側即ち移動体と接触す
る端部側にのみ変位が現れる。そこで、振動体の固定端
側に本来生じる変位が自由端側即ち移動体と接触する端
部側に加算された状態即ち約2倍となって生じる。また
、転勤周波数は同じであるから速度も約2倍となる。
(Function) Therefore, when the vibrating body stretches and vibrates, the movement in the stretching direction is restricted at the end opposite to the end of the vibrating body that contacts the moving body, so the free end side, that is, the contact with the moving body Displacement appears only on the end side. Therefore, the displacement that originally occurs on the fixed end side of the vibrating body is added to the free end side, that is, the end side that contacts the movable body, that is, the displacement is approximately doubled. Furthermore, since the transfer frequency is the same, the speed is approximately twice as high.

(実施例) 以下、本発明の構成を図面に示す実施例に基づいて詳細
に説明する。
(Example) Hereinafter, the configuration of the present invention will be described in detail based on an example shown in the drawings.

まず、本発明にかかる超音波モータの原理について説明
しておく。
First, the principle of the ultrasonic motor according to the present invention will be explained.

第3図(A)において、符号1で示す角柱状の部材は弾
性体で作られた振動体である。ここでは、振動体1の長
さしを40−1高さHを10IIIIとした。振動体1
の下面側には、圧電セラミックスから成る超音波振動子
2が貼り合せられている。超音波振動子20表裏両面即
ち上面と下面とには金属薄膜から成る電極3.4が設け
られており、上側の電極膜3が振動体1に貼り合せられ
ている。
In FIG. 3(A), a prismatic member indicated by reference numeral 1 is a vibrating body made of an elastic body. Here, the length of the vibrating body 1 was set to 40-1, and the height H was set to 10III. Vibrating body 1
An ultrasonic transducer 2 made of piezoelectric ceramics is bonded to the lower surface of the holder. Electrodes 3.4 made of metal thin films are provided on both the front and back surfaces of the ultrasonic vibrator 20, that is, on the top and bottom surfaces, and the upper electrode film 3 is bonded to the vibrating body 1.

超音波振動子2の長さをa、超音波振動子2からの振動
体1の突出量(オーバーハング量)をbとしたとき、a
とbの関係が、a:b=2:1の関係になるように(即
ちL=a+2bとなるように)設定した。
When the length of the ultrasonic vibrator 2 is a, and the amount of protrusion (overhang amount) of the vibrating body 1 from the ultrasonic vibrator 2 is b, then a
The relationship between and b was set to be a:b=2:1 (that is, L=a+2b).

いま、超音波振動子2の電極3,4の間に、所定の駆動
回路を介して交番信号を印加し、この交番信号の周波数
を連続的に変化させると、特定の周波数で超音波振動子
2のアドミッタンスが急激に増大してピークを示す、こ
れを実測して示したのが第4図であり、周波数foとf
lとf2とでアドミッタンスが急激に増大し、ピークを
示している。アドミッタンスが急激に増大しているとい
うことは大電流が流れているということであり、それぞ
れが共振モードとなる。これら共振モードのうちで2の
共振モードにおける振動体1は第3図(B)に示すよう
に、振動体1の長手方向に伸縮するように振動する。こ
の場合の振幅は印加する電圧によって変化するが、通常
振動#1の先端部は数μm程度の振幅で振動する。因み
にflの共振モードでは超音波振動子2から突出した部
分の振動体1が上下方向でかつ互いに逆方向に撓み、波
打つように振動する。
Now, if an alternating signal is applied between the electrodes 3 and 4 of the ultrasonic transducer 2 via a predetermined drive circuit and the frequency of this alternating signal is continuously changed, the ultrasonic transducer will change at a specific frequency. The admittance of 2 suddenly increases and shows a peak. This is actually measured and shown in Figure 4, where the frequencies fo and f
At l and f2, the admittance increases rapidly and shows a peak. A rapid increase in admittance means that a large current is flowing, and each becomes a resonance mode. The vibrating body 1 in two of these resonance modes vibrates so as to expand and contract in the longitudinal direction of the vibrating body 1, as shown in FIG. 3(B). The amplitude in this case changes depending on the applied voltage, but normally the tip of vibration #1 vibrates with an amplitude of about several μm. Incidentally, in the fl resonance mode, the parts of the vibrating body 1 that protrude from the ultrasonic vibrator 2 are bent in the vertical direction and in mutually opposite directions, and vibrate in a undulating manner.

本発明は、上述の振動体1の共振モードのうち、長手方
向に伸縮するf2共振モードを利用したものである。第
1図にその原理を示す。
The present invention utilizes the f2 resonance mode, which expands and contracts in the longitudinal direction, among the resonance modes of the vibrating body 1 described above. Figure 1 shows the principle.

弾性体によって任意の形状例えば角柱状に成形された振
動体1の少なくとも一面に超音波振動子2が貼着されて
いる。超音波振動子2としては例えば圧電セラミックス
の採用が好ましい、この圧電セラミックス2は、その上
面と下面に形成された金属薄膜の電極3.4の間に交番
信号を印加することによって所定の振動を一体となった
振動体1に起こさせる。超音波振動子2は一方の電極部
分例えば上面の電極4部分を振動体1に例えば接着剤等
によって貼着することによって、振動体1と一体化され
ている。また、この超音波振動子2と振動体1との配置
関係は、第3図に示す原理と同様に、超音波振動子2の
長さaと、振動体1の両端部の超音波振動子2から突出
する量(オーバ−ハング量)bとの関係がa:b=2:
1の関係になるように設定することが好ましい、この場
合、振動体1の振動の振幅が最大となる。
An ultrasonic vibrator 2 is attached to at least one surface of a vibrating body 1 formed of an elastic body into an arbitrary shape, such as a prismatic shape. For example, it is preferable to use piezoelectric ceramics as the ultrasonic vibrator 2. The piezoelectric ceramics 2 generates a predetermined vibration by applying an alternating signal between the metal thin film electrodes 3.4 formed on its upper and lower surfaces. This is caused by the integrated vibrating body 1. The ultrasonic vibrator 2 is integrated with the vibrating body 1 by pasting one electrode portion, for example, the upper electrode 4 portion, to the vibrating body 1 with, for example, an adhesive. Furthermore, the arrangement relationship between the ultrasonic transducer 2 and the vibrating body 1 is similar to the principle shown in FIG. The relationship between the amount of protrusion from 2 (overhang amount) b is a:b=2:
It is preferable to set the relationship to be 1. In this case, the amplitude of the vibration of the vibrating body 1 is maximized.

振動体1の一方の端部、例えば本実施例の場合端縁部X
の近傍には振動時に接触可能な位置に移動体5が配置さ
れている。移動体5は図示の例ではローラのような回転
体であり、回転軸Oを中心に回転可能に設けられている
。この移動体5の周面と振動体1の振動面即ち端縁部(
稜線ないし面)Xとは平行な関係となるように当接また
は接近させて配置されている。更に図示するように、振
動体1は、端縁部Xと移動体5の回転軸0を結ぶ線と、
振動体1の振動方向と平行な面例えばX2との成す角度
θがほぼ45゛となるように配置されている。もっとも
、角度θは45°である必要は特になく、0゛以上90
°未溝の範囲で適宜設定できる。即ち、端縁部Xと移動
体5の回転軸Oを結ぶ線が、振動体1の振動方向と平行
な面X2に対して傾いていれば良い。この移動体5は振
動体1との間に適度な摩擦が存在したときに振動体1の
振動を受けて移動させられる。したがって、振動体1が
収縮するときには、振動体1の動きは移動体5に対し逃
げる方向となるため牽擦力が低減して移動体5からは遊
離される。
One end of the vibrating body 1, for example, the edge X in this embodiment
A movable body 5 is arranged near the movable body 5 at a position where it can be contacted during vibration. In the illustrated example, the moving body 5 is a rotating body such as a roller, and is provided so as to be rotatable about the rotation axis O. The peripheral surface of the moving body 5 and the vibrating surface of the vibrating body 1, that is, the edge portion (
(edge line or surface) X and are placed in contact with or close to each other so as to be parallel to each other. Further, as shown in the figure, the vibrating body 1 has a line connecting the end edge X and the rotation axis 0 of the moving body 5,
The vibrating body 1 is arranged so that the angle θ formed with a plane parallel to the vibration direction of the vibrating body 1, for example, X2, is approximately 45°. However, the angle θ does not need to be 45°, and is 0° or more and 90°.
° Can be set as appropriate within the ungrooved range. That is, it is sufficient that the line connecting the end edge X and the rotation axis O of the moving body 5 is inclined with respect to the plane X2 parallel to the vibration direction of the vibrating body 1. The movable body 5 is moved by the vibration of the vibrating body 1 when an appropriate amount of friction exists between the movable body 5 and the vibrating body 1. Therefore, when the vibrating body 1 contracts, the vibrating body 1 moves in the direction of escaping from the movable body 5, so that the traction force is reduced and the vibrating body 1 is separated from the movable body 5.

振動体1は、振動体1の伸縮振動方向の側面であって移
動体5と接する端縁部Xとは逆の側面X1を伸縮振動方
向に移動しないように規制する支持手段6と、振動体1
の伸1m振動方向の側面と交差する側の側面であって移
動体5と接する端縁部Xを有する側面とは逆の側面X2
を伸縮振動方向には移動自在に支持すると共に当該振動
体1を移動体5側に押しつける付勢手段7とによって支
持され、それ以外の点において固定されていない。
The vibrating body 1 includes a support means 6 for restricting a side surface X1 of the vibrating body 1 in the stretching vibration direction, which is opposite to the end edge X in contact with the movable body 5, from moving in the stretching vibration direction, and a vibrating body. 1
side surface X2 that is opposite to the side surface that intersects the side surface in the vibration direction of 1 m and has the end edge X in contact with the moving body 5;
is supported movably in the direction of expansion and contraction vibration, and is supported by an urging means 7 that presses the vibrating body 1 toward the movable body 5, and is not fixed in other respects.

支持手段6は、振動体1の移動体5と接触する端縁部X
の反対側の端部X1を少なくとも仲Ia振動方向(X方
向)へは移動させないように動きを規制するものであっ
て、伸縮振動方向と直交する方向(X方向)への移動は
規制してもしなくともいずれでも良い、具体的には振動
体1の移動体5と接触しない側の端部は例えば筐体枠な
どに接着などによって固定されている。また、付勢手段
7は、振動体1の伸縮振動方向と平行な面でかつ移動体
5と接触しない方の面(即ち振動体の下面)X2を振動
体1が自由に移動し得るように支持すると共にこの振動
体1を移動体に5に対して付勢するものであって、X方
向及びY方向の振動体1の移動を許容し得る構造であれ
ば特に限定されない。
The support means 6 has an edge portion X of the vibrating body 1 that comes into contact with the movable body 5.
The movement of the end X1 on the opposite side of the center Ia is restricted so as not to move at least in the vibration direction (X direction), and the movement in the direction (X direction) orthogonal to the stretching vibration direction is restricted. It may be either or not. Specifically, the end of the vibrating body 1 on the side that does not come into contact with the movable body 5 is fixed to, for example, a housing frame by adhesive or the like. Further, the biasing means 7 is arranged so that the vibrating body 1 can freely move on a surface X2 that is parallel to the direction of expansion and contraction vibration of the vibrating body 1 and does not come into contact with the movable body 5 (i.e., the lower surface of the vibrating body). The structure is not particularly limited as long as it supports the vibrating body 1 and urges the vibrating body 1 against the movable body 5, and allows movement of the vibrating body 1 in the X direction and the Y direction.

例えば、振動体1が伸縮振動方向へのみ移動可能に支持
する支持機構とこの支持機構全体を移動体511IIへ
向けて付勢するようにしても良いし、またX方向への振
動体1の移動を可能とする支持機構と振動体1を移動体
5へ付勢する手段とを並設しても良い0本実施例の場合
、付勢手段7としては板ばねが採用されており、該板ば
ね7によって振動体1の超音波振動子2よりも先端側を
支えて移動体5側へ押しつけるように構成している。こ
の付勢手段には加圧力[F]を印加することによって移
動体5に推力をf=μ・[F] ・ COSθで得るこ
とができる。尚、この付勢手段7では振動方向(X方向
)の移動を規制しなければ十分なので、付勢手段7によ
って支持される面X2が防振材によって支持されるとし
ても、X方向の移動が可能であれば同等問題ない。
For example, a support mechanism that supports the vibrating body 1 so as to be movable only in the direction of expansion and contraction vibration, and the entire support mechanism may be biased toward the movable body 511II, or the vibrating body 1 may be moved in the X direction. In this embodiment, a leaf spring is adopted as the urging means 7, and the support mechanism that enables the vibration body 1 to move toward the movable body 5 may be installed in parallel. The spring 7 supports the tip side of the vibrating body 1 relative to the ultrasonic vibrator 2 and is configured to press it toward the moving body 5 side. By applying a pressing force [F] to this urging means, a thrust force of f=μ·[F]·COSθ can be obtained on the movable body 5. Note that this biasing means 7 is sufficient as long as it does not restrict movement in the vibration direction (X direction), so even if the surface X2 supported by the biasing means 7 is supported by a vibration isolator, the movement in the X direction is If possible, there is no problem.

超音波振動子2は、駆動回路から交番信号が印加される
ことによって振動させられる。これを2つの超音波振動
子2.2を備える振動体を例に挙げて第5図に基づいて
説明する。波形発振器6は、f22モード択スイッチS
W2を“ON”にすることによって発振動作を開始し、
前述のf2モードの周波数が発振される。波形の形状は
、通常、正弦波、三角波、矩形波等いずれでもよい。発
振器6から出力された交番信号は増幅器7で増幅され、
二つの超音波振動子2の各電極3.4間に印加される。
The ultrasonic vibrator 2 is caused to vibrate by applying an alternating signal from a drive circuit. This will be explained based on FIG. 5, taking as an example a vibrating body having two ultrasonic vibrators 2.2. The waveform oscillator 6 has an f22 mode selection switch S.
By turning W2 “ON”, oscillation operation is started,
The f2 mode frequency described above is oscillated. The shape of the waveform may generally be a sine wave, a triangular wave, a rectangular wave, or the like. The alternating signal output from the oscillator 6 is amplified by the amplifier 7,
It is applied between each electrode 3.4 of the two ultrasonic transducers 2.

二つの超音波振動子2の各電極3,4は電源に対し並列
に接続されている。この駆動回路から印加される交番信
号は、振動体1と超音波振動子2とを含めた全体の弾性
的性質からで2共振モードとなる成る周波数の信号がで
ある。
Each electrode 3, 4 of the two ultrasonic transducers 2 is connected in parallel to a power source. The alternating signal applied from this drive circuit has a frequency that results in two resonance modes due to the elastic properties of the entire vibrating body 1 and ultrasonic transducer 2.

以上のように構成された超音波モータによると、次のよ
うに作動する。スイッチSW2が“ON”に切替えられ
ると、f2共振モードの周波数の交番信号が発信器6か
ら出力され、増幅器7において増幅されてから超音波振
動子2に印加されるので、振動体1がその長手方向即ち
伸縮方向(X方向)に振動する。このとき、振動#1の
一端X1が支持手段6によって振動方向にはその移動が
規制されているため、規制のない自由端側即ち移動体5
と接触する端縁部X側に振動の変位が現われる。換言す
れば、振動体1の端縁部x(I!Iのみが図上Bのスト
ローク範囲で振動する。このストロークは従来の超音波
モータの場合(矢印Aで示す)と比べて、同じ条件の振
動体1の場合で約2倍となる。この振動体1の振動動作
のうち右方への移動時即ち伸長時には端縁部Xが移動体
らの周面に対して食い込む向きとなるため移動体5を反
時計方向に押し回す、一方、振動体1の振動動作のうち
左方への移動時(収縮時)には端縁部Xが移動#5の周
面に対して逃げる向きとなるため、振動体lと移動体5
との間の摩擦力が減って移動体5は連動しない。結局、
共振モードf2では、移動体5は図示の場合反時計方向
に回転駆動されることになる。
The ultrasonic motor configured as described above operates as follows. When the switch SW2 is turned "ON", an alternating signal of the f2 resonance mode frequency is output from the transmitter 6, amplified by the amplifier 7, and then applied to the ultrasonic transducer 2, so that the vibrating body 1 It vibrates in the longitudinal direction, that is, the expansion and contraction direction (X direction). At this time, since the movement of one end X1 of the vibration #1 in the vibration direction is restricted by the support means 6, the free end that is not restricted, that is, the movable body 5
A vibrational displacement appears on the side of the end edge X that comes into contact with. In other words, only the edge x (I!I) of the vibrating body 1 vibrates in the stroke range B in the diagram. In the case of the vibrating body 1, it is approximately twice as large.When the vibrating body 1 moves to the right during the vibration operation, that is, when it extends, the edge portion X is oriented to bite into the circumferential surface of the movable body. The moving body 5 is pushed counterclockwise. On the other hand, during the vibration movement of the vibrating body 1, when moving to the left (when contracting), the end edge X is in the direction of escaping from the circumferential surface of movement #5. Therefore, the vibrating body l and the moving body 5
Since the frictional force between the moving body 5 and the moving body 5 is reduced, the movable body 5 does not move in conjunction with the moving body 5. in the end,
In the resonance mode f2, the movable body 5 is rotated counterclockwise in the illustrated case.

尚、上述の実施例は本発明の好適な実施の一例ではある
がこれに限定されるものではなく本発明の要旨を逸脱し
ない範囲において種々変形実施可能である。例えば、図
示の実施例では移動体5が回転体になっていたが、移動
体5としては直線方向に移動するものであっても差し支
えない。その場合、前述の端縁部Xに相当する部位即ち
振動体1の移動体5が接触する面が移動体5の面に対し
て傾いていればよい。
It should be noted that although the above-described embodiment is an example of a preferred embodiment of the present invention, the present invention is not limited thereto, and various modifications can be made without departing from the gist of the present invention. For example, in the illustrated embodiment, the movable body 5 is a rotating body, but the movable body 5 may be a body that moves in a straight line. In that case, it is only necessary that the portion corresponding to the above-mentioned edge portion X, that is, the surface of the vibrating body 1 that the movable body 5 contacts, is inclined with respect to the surface of the movable body 5.

また、一つの振動体1に対しては、少なくとも1個の超
音波振動子2を設ければ足りるが、振動振幅あるいは駆
動力を大きくするためには、第2図に示すように、一つ
の振動体1に対して2個の超音波振動子2.2を設けて
も良い。
Furthermore, it is sufficient to provide at least one ultrasonic transducer 2 for one vibrating body 1, but in order to increase the vibration amplitude or driving force, one Two ultrasonic transducers 2.2 may be provided for the vibrating body 1.

(発明の効果) 以上の説明より明らかなように、本発明の超音波モータ
は、振動体の振動方向の端部の一方を振動方向に固定す
ると共にかつ他端側を振動方向に移動可能に支持しかつ
振動方向と直交する方向から振動体全体を移動体に対し
付勢するようにしているので、移動体と接触する振動体
の端部とは逆の端部において伸縮方向への移動が規制さ
れて自由端側即ち移動体と接触する端部に変位が現れる
(Effects of the Invention) As is clear from the above description, the ultrasonic motor of the present invention has one end of the vibrating body fixed in the vibration direction, and the other end movable in the vibration direction. Since the entire vibrating body is supported and biased against the movable body from a direction perpendicular to the vibration direction, movement in the expansion and contraction direction is prevented at the end opposite to the end of the vibrating body that contacts the movable body. Displacement appears at the regulated free end side, that is, at the end that comes into contact with the moving body.

そこで、本発明の超音波モータによると、振動体の固定
端側に本来生じる変位が自由端側即ち移動体と接触する
端部側に加算された状態即ち約2倍となって生じ、移動
速度も約2倍となる。
Therefore, according to the ultrasonic motor of the present invention, the displacement that originally occurs on the fixed end side of the vibrating body is added to the free end side, that is, the end side that contacts the moving body, that is, the displacement is approximately doubled, and the movement speed is increased. It will also be about twice as large.

また、本発明の超音波モータによると、変位量が2倍に
なることから、f=kx (k ニ一定)から推力が2
倍になる。
In addition, according to the ultrasonic motor of the present invention, since the amount of displacement is doubled, the thrust is increased by 2 from f=kx (k is constant).
Double.

(産業上の利用可能性) 本発明の超音波モータはカードリーダ(Cardrea
der )やオルゴール等に応用可能である。その場合
、磁気カード等を送るための送り用ローラやオルゴール
の振動弁を弾くドラムの回転用ローラを移動体とすれば
良い。
(Industrial Applicability) The ultrasonic motor of the present invention can be used with a card reader (Cardrea).
der), music boxes, etc. In that case, the moving body may be a feeding roller for feeding a magnetic card or the like, or a rotating roller for a drum that plays the vibration valve of a music box.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の基本構成を示す原理図である。 第2図は振動体と超音波振動子との配置関係の他の実施
例を示す説明図である。 第3図は共振モードを説明する図で、第3図(A>は振
動体と超音波振動子との配置関係を示し、第3図(B)
は振動体の仲a振動状態を示す。 第4図は振動体の共振モードを説明するための超音波振
動子に印加する信号の周波数とアドミッタンスとの関係
を示すグラフである。 第5図は本発明にかかる超音波モータの駆動回路の一実
施例を示す概略図である。 第6図(A)及び第6図(B)は従来の超音波モータに
おける振動体の固定方法を示す説明図である。 l・・・振動体、 2・・・超音波振動子、 5・・・移動体、 6・・・支持手段、 7・・・付勢手段、 X・・・振動体の一方の端部(端縁部)、Xl・・・移
動体と接触しない反対側の振動方向の端部、 X2・・・移動体と接触しない振動方向と平行な面。
FIG. 1 is a principle diagram showing the basic configuration of the present invention. FIG. 2 is an explanatory diagram showing another example of the arrangement relationship between the vibrating body and the ultrasonic transducer. Figure 3 is a diagram explaining the resonance mode, where Figure 3 (A> shows the arrangement relationship between the vibrating body and the ultrasonic transducer, and Figure 3 (B)
indicates the middle a vibration state of the vibrating body. FIG. 4 is a graph showing the relationship between the frequency of the signal applied to the ultrasonic transducer and the admittance for explaining the resonance mode of the vibrating body. FIG. 5 is a schematic diagram showing an embodiment of an ultrasonic motor drive circuit according to the present invention. FIG. 6(A) and FIG. 6(B) are explanatory diagrams showing a method of fixing a vibrating body in a conventional ultrasonic motor. l... Vibrating body, 2... Ultrasonic vibrator, 5... Moving body, 6... Supporting means, 7... Biasing means, X... One end of the vibrating body ( (Edge), Xl...An end in the opposite vibration direction that does not come into contact with the moving body, X2...A surface parallel to the vibration direction that does not come into contact with the moving body.

Claims (1)

【特許請求の範囲】[Claims]  交番信号が印加されて伸縮するように振動する振動体
と、該振動体を振動させる駆動回路と、上記振動体の一
方の端部に接触する移動体と、上記振動体の上記伸縮方
向の端部であって上記移動体と接する端部とは逆の端部
を伸縮方向に移動しないように規制する支持手段と、上
記振動体の上記伸縮方向と平行な面を上記伸縮方向には
移動自在に支持すると共に当該振動体を上記移動体側に
押しつける付勢手段とを備え、上記振動体の伸縮移動に
よつて上記振動体の端部に接する移動体を一方向に移動
させることを特徴とする超音波モータ。
A vibrating body that vibrates to expand and contract upon application of an alternating signal, a drive circuit that vibrates the vibrating body, a moving body that contacts one end of the vibrating body, and an end of the vibrating body in the expansion and contraction direction. support means for restricting an end of the vibrating body opposite to the end in contact with the movable body from moving in the expansion/contraction direction; and a support means that is movable in the expansion/contraction direction on a surface parallel to the expansion/contraction direction of the vibrating body. and urging means for pressing the vibrating body toward the movable body, and the movable body in contact with the end of the vibrating body is moved in one direction by the expansion and contraction movement of the vibrating body. ultrasonic motor.
JP2224258A 1990-08-28 1990-08-28 Ultrasonic motor Pending JPH04109875A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2224258A JPH04109875A (en) 1990-08-28 1990-08-28 Ultrasonic motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2224258A JPH04109875A (en) 1990-08-28 1990-08-28 Ultrasonic motor

Publications (1)

Publication Number Publication Date
JPH04109875A true JPH04109875A (en) 1992-04-10

Family

ID=16810962

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2224258A Pending JPH04109875A (en) 1990-08-28 1990-08-28 Ultrasonic motor

Country Status (1)

Country Link
JP (1) JPH04109875A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008226647A (en) * 2007-03-13 2008-09-25 Shishido Seidenki Kk Ion generator
JP4605666B2 (en) * 2005-06-20 2011-01-05 ヒューグルエレクトロニクス株式会社 Discharge unit for AC ionizer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4605666B2 (en) * 2005-06-20 2011-01-05 ヒューグルエレクトロニクス株式会社 Discharge unit for AC ionizer
JP2008226647A (en) * 2007-03-13 2008-09-25 Shishido Seidenki Kk Ion generator

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