JPS62126873A - Piezoelectric motor - Google Patents
Piezoelectric motorInfo
- Publication number
- JPS62126873A JPS62126873A JP60264432A JP26443285A JPS62126873A JP S62126873 A JPS62126873 A JP S62126873A JP 60264432 A JP60264432 A JP 60264432A JP 26443285 A JP26443285 A JP 26443285A JP S62126873 A JPS62126873 A JP S62126873A
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric element
- transmission member
- vibration transmission
- piezoelectric
- radial
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 24
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000013013 elastic material Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 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
- H02N2/002—Driving devices, e.g. vibrators using only longitudinal or radial 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
- H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
- H02N2/005—Mechanical details, e.g. housings
- H02N2/0065—Friction interface
-
- 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
Landscapes
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
Description
【発明の詳細な説明】
技術分野
本発明は、圧電素子を駆動して駆動力を得るようにした
圧電モータに関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a piezoelectric motor that obtains driving force by driving a piezoelectric element.
従来技術
第５図は従来技術の圧電モータ１の一部分の構成を示す
平面図であり、第６図は第５図の正面図である。第５図
およＶ第６図を参照して、従来技術の圧電モータ１の構
成と動作について説明する。Prior Art FIG. 5 is a plan view showing the structure of a part of the piezoelectric motor 1 of the prior art, and FIG. 6 is a front view of FIG. 5. The configuration and operation of the piezoelectric motor 1 of the prior art will be described with reference to FIGS. 5 and 6. FIG.
圧電モータ１は、圧電体に電極が形成された圧電素子２
の一方表面に、たとえば鉄Ｆｅなどから形成され圧電素
子２の振動を吸収することなく一方表面から他方表面に
伝達する振動伝達部材３が固定される。圧電素子２の振
動伝達部材３と反対側には、たとえばゴムなどの弾性材
料からなるｔｌ街部材４が配置される。A piezoelectric motor 1 includes a piezoelectric element 2 in which electrodes are formed on a piezoelectric body.
A vibration transmission member 3 is fixed to one surface of the piezoelectric element 2, which is made of, for example, iron and which transmits the vibration of the piezoelectric element 2 from one surface to the other surface without absorbing it. On the opposite side of the piezoelectric element 2 from the vibration transmission member 3, a tension member 4 made of an elastic material such as rubber is arranged.
振動伝達部材３の圧電素子２と反対側には、周方向に複
数の突起５ ａ、５ ｂ、５ ｃ、５ ｄ（必要な場合
には参照符５で総称する）が形成される。これらの各突
起５は、第５図お上りｔｐ、ａ図に示すように、たとえ
ば振動伝達部材３の周方向に沿い、一定方向に傾斜して
構成される。この各突起５の先ｒａ部６ａ、６ｂ＋６ｅ
、６ｄ（必要な場合には参照符６で総称する）に共通に
接触して、たとえば円板状の回転部材７が配置される。A plurality of protrusions 5 a, 5 b, 5 c, and 5 d (generally referred to as reference numeral 5 when necessary) are formed in the circumferential direction on the opposite side of the vibration transmitting member 3 from the piezoelectric element 2. Each of these projections 5 is configured to be inclined in a certain direction, for example, along the circumferential direction of the vibration transmission member 3, as shown in FIGS. 5A and 5B. Tip ra portions 6a, 6b+6e of each protrusion 5
, 6d (generally referred to by the reference numeral 6 when necessary), a rotating member 7, for example in the form of a disc, is disposed in common contact with the rotating members 7, 6d (collectively referred to by the reference numeral 6 when necessary).
後述されるようにこの回転部材７が四転されて、圧電モ
ータとしての駆動力が取出される。As will be described later, this rotating member 7 is rotated four times to extract driving force as a piezoelectric motor.
以下に、動作について述べる。圧電素子２の矢符Ａ１方
向の変位は、振動伝達部材３によって伝達され、すなわ
ち振動伝達部材３の回転部材７側の表面は第６図の仮想
線１１で示す状態に変位する。このとき、回転部材７は
図示しない構成によって第６図の上方に変位しないよう
に支持されているので、各突起５はその基端部を振動伝
達部材３によって回転部材７側に変位され、一方、その
先端部６は回転部材７に当接する。したがって各突起５
は、第６図の仮想線！２で示すように傾斜方向にたわみ
、このとき回転部材７が同方向に回転される。The operation will be described below. The displacement of the piezoelectric element 2 in the direction of the arrow A1 is transmitted by the vibration transmission member 3, that is, the surface of the vibration transmission member 3 on the rotating member 7 side is displaced to the state shown by the imaginary line 11 in FIG. At this time, since the rotating member 7 is supported by a structure not shown so as not to be displaced upward in FIG. , its tip 6 abuts against a rotating member 7 . Therefore, each protrusion 5
is the virtual line in Figure 6! As shown by 2, it is bent in the direction of inclination, and at this time, the rotating member 7 is rotated in the same direction.
一方、圧電素子２の矢符Ａ２方向の縮退変位は、振！Ｉ
！ｌＪ伝達部材３を第６図の実線で示す位置に変位し、
したがって各突起５の先端６は回転部材７から離間し、
やはり第６図の実線で示される位置に復帰する。このよ
うな動作を繰り返すことによって回転部材７を矢符Ａ３
方向に回転駆動することができる。On the other hand, the degeneracy displacement of the piezoelectric element 2 in the direction of arrow A2 is ! I
! Displace the lJ transmission member 3 to the position shown by the solid line in FIG. 6,
Therefore, the tip 6 of each projection 5 is spaced apart from the rotating member 7,
It also returns to the position shown by the solid line in FIG. By repeating this operation, the rotating member 7 is moved to the arrow A3.
It can be rotated in the direction.
上述したような構成と動作を有する従来技術の圧電モー
タ１では、圧電モータ５の厚み方向 （第６図の上下方
向）の長さを短（することが困難であり、また鉄などの
材料からｖ４７＆される振動伝達部材３に、上述したよ
うな各突起５を形成する加工は、たとえば切削加工など
によらざるを得す、したがってその加工が極めて困難で
あるという問題点があった。In the conventional piezoelectric motor 1 having the configuration and operation described above, it is difficult to shorten the length of the piezoelectric motor 5 in the thickness direction (in the vertical direction in FIG. The process of forming the above-mentioned protrusions 5 on the vibration transmitting member 3 subjected to v47& has to be carried out, for example, by cutting, and therefore, there is a problem in that the process is extremely difficult.
目 的
本発明の目的は、上述の問題、侭を解決し、構成が小形
化されかつ高効率で駆動力を得ることができる改善され
た圧電モータを提供することである。OBJECT It is an object of the present invention to solve the above-mentioned problems and disadvantages, and to provide an improved piezoelectric motor that has a compact structure and can obtain driving force with high efficiency.
実施例
ａｉ図は本発明の一実施例の圧電モータ１０の断面図で
あり、第２図は第１図の圧電モータ１０の分解斜視図で
あり、ＰＩＩＪ３図は振動伝達部材１１の斜視図である
。ｔＪＩＪ１図〜第３図を参照して、本実施例の圧電モ
ータ１０の構成と動作について説明する１本実施例の圧
電モータ１０においては、たとえばＰＺＴなとの圧電セ
ラミックス材料から構成され、電極などが形成された円
板状の圧電素子１２を周方向から外囲して、たとえば鉄
などの剛性材料からたとえば円環状に形成される振動伝
達部材１１が固着される。振動伝達部材１１の外周部１
３に、半径方向外方に向かって突出しかつ周方向に沿っ
て一定方向に傾針した突起１４ａ、１４ ｂ、 １４
ｅ、 １４ ｄが突設される。FIG. 2 is an exploded perspective view of the piezoelectric motor 10 of FIG. 1, and FIG. PIIJ3 is a perspective view of the vibration transmission member 11. be. The structure and operation of the piezoelectric motor 10 of this embodiment will be explained with reference to FIGS. A vibration transmitting member 11 made of a rigid material such as iron and having an annular shape is fixed around the disk-shaped piezoelectric element 12 in the circumferential direction. Outer periphery 1 of vibration transmission member 11
3, protrusions 14a, 14b, 14 that protrude outward in the radial direction and are inclined in a certain direction along the circumferential direction.
e, 14 d are provided protrudingly.
このような振動伝達部材１１を外囲して、円環状の回転
部材である回転子１５が配置される。回転子１５は７ラ
ンノ１６を有し、内輪１７、外輪１８および転動体１９
からなる軸受２０に係止される。A rotor 15, which is an annular rotating member, is arranged surrounding the vibration transmitting member 11. The rotor 15 has seven runs 16, an inner ring 17, an outer ring 18 and rolling elements 19.
It is locked to a bearing 20 consisting of.
また上述したような構成全体を収納するハウジング２１
が配置ｌされ、圧電素子１２とハウジング２１の底板２
２との開には、たとえばゴムなどの弾性材料からなり圧
電素子１２の矢符Ｂｌ、Ｂ２方向（第１図の上下方向に
沿う伸縮変位）の振動を吸収することができる１１衝部
材２３が配置され、圧電素子１２と底板２２とに、それ
ぞれたとえばシリコンゴムなどの弾性状接着剤などによ
って固着される。Furthermore, a housing 21 that houses the entire configuration as described above is provided.
are arranged, the piezoelectric element 12 and the bottom plate 2 of the housing 21
2, there is a shock member 23 made of an elastic material such as rubber and capable of absorbing vibrations of the piezoelectric element 12 in the arrow B1 and B2 directions (expansion/contraction displacement along the vertical direction in FIG. 1). The piezoelectric element 12 and the bottom plate 22 are each fixed to the piezoelectric element 12 and the bottom plate 22 using an elastic adhesive such as silicon rubber.
第４図は第１図示の圧電モータ１０の一部分の拡大平面
図である。第１図〜第４図を参照して、本実施例の圧電
モータ１０の動作について説明する。圧電素子１２が電
力付勢され、圧電素子１２の半径方向の伸長変位によっ
て、振動伝達部材１１の外周部１３は第４図の仮想＃ｉ
Ｊ！３で示される状態に変位し、したがって回転子１５
の内周面２４と同曲率に形成された突起１４の先端部２
５は、回転子１５の内周面２４に当接しており、したが
って振動伝達部材１１の一仮想直径線！４に対してθだ
け傾斜して形成された突起１４は、矢符Ｂ３方向（突起
１４の傾斜方向）への力を受け、第４図の仮想線１５で
示す状態にたわむことになる。FIG. 4 is an enlarged plan view of a portion of the piezoelectric motor 10 shown in FIG. The operation of the piezoelectric motor 10 of this embodiment will be explained with reference to FIGS. 1 to 4. The piezoelectric element 12 is energized with electric power, and due to the radial expansion displacement of the piezoelectric element 12, the outer peripheral part 13 of the vibration transmission member 11 is moved to the virtual position #i in FIG.
J! 3 and thus the rotor 15
The tip 2 of the protrusion 14 is formed to have the same curvature as the inner peripheral surface 24 of the
5 is in contact with the inner circumferential surface 24 of the rotor 15, and therefore one imaginary diameter line of the vibration transmission member 11! The protrusion 14, which is formed to be inclined by θ with respect to 4, receives a force in the direction of arrow B3 (the direction of inclination of the protrusion 14), and is bent into the state shown by the imaginary line 15 in FIG.
このとき、回転子１５の内周面２４と、突起１４の先ｉ
部２５との摩擦力によって、回転子１５は矢符Ｂ４方向
に角変位される。At this time, the inner peripheral surface 24 of the rotor 15 and the tip i of the protrusion 14
Due to the frictional force with the portion 25, the rotor 15 is angularly displaced in the direction of arrow B4.
次に圧電素子１２が半径方向に縮退したとき、振動伝達
部材１１の外周部１３は、第４図の実線で示す状態に復
帰し、このとき突起１４も第４図の実線で示す状態に復
帰する。このような動作を繰り返し行なうことによって
、回転子１５を矢符Ｂ４方向に回転駆動することができ
る。すなわち、突起１４の先端部２５の矢符Ｂ６に示す
楕円運動によって、回転子１５は矢符Ｂ４方向に回転駆
動される。Next, when the piezoelectric element 12 retracts in the radial direction, the outer peripheral portion 13 of the vibration transmission member 11 returns to the state shown by the solid line in FIG. 4, and at this time, the protrusion 14 also returns to the state shown by the solid line in FIG. do. By repeating such operations, the rotor 15 can be rotationally driven in the direction of arrow B4. That is, the rotor 15 is rotationally driven in the direction of arrow B4 by the elliptical movement of the tip 25 of the protrusion 14 shown by arrow B6.
以上のように本実施例においては、円環状の回１に子１
５の内周面２４に、振動伝達部材１１の突起１４の先端
部２５を当接させて、半径方向の圧電素子１２の変位を
用いて、回転子１５を回転駆動するようにする。そのた
め第５図および第６図を参照して説明した従来技術のよ
うに、回転部材７を振動伝達部材３１１ｍから離間しな
いように保持する構成が不必要となり、かつ突起１４の
先端部２５の形状を、上述したように回転子１５の内周
面２４と同面率で形成することができる。As described above, in this embodiment, the child 1 is placed in the circular ring 1.
The tip portion 25 of the protrusion 14 of the vibration transmission member 11 is brought into contact with the inner peripheral surface 24 of the vibration transmitting member 11, and the rotor 15 is rotationally driven using the displacement of the piezoelectric element 12 in the radial direction. Therefore, as in the prior art described with reference to FIGS. 5 and 6, there is no need for a structure for holding the rotating member 7 so as not to separate it from the vibration transmitting member 311m, and the shape of the tip 25 of the projection 14 is eliminated. can be formed to have the same surface ratio as the inner circumferential surface 24 of the rotor 15, as described above.
したがって前記先端部２５の内周面２４への密着の程度
を＃ｉ段に向上でき、回転子１５をより効率的に回転駆
動することができる。一方、振動伝達部材１１を圧電素
子１２の半径方向外周部に設け、また前記突起１４を振
動伝達部材１１の外周部１３から半径方向外方に向けて
突設させるようにした。したがって、このような圧電モ
ータ１０の１γみ方向（第１図の上下方向）の厚みを薄
くすることができ、しｒこがって、圧電モータ１０の薄
形化、小形化を実現することができる。また突起１４ａ
〜１４ｄを有する振動伝達部材１１は、たとえば打ち抜
き加工などによる製造が容易であり、したがって従来技
術の圧電モータ１と比較して、！！遺シフスト格段に低
減することができる。Therefore, the degree of close contact of the tip portion 25 to the inner circumferential surface 24 can be improved to #i stage, and the rotor 15 can be rotationally driven more efficiently. On the other hand, the vibration transmission member 11 is provided on the radially outer circumference of the piezoelectric element 12, and the protrusion 14 is provided to protrude radially outward from the outer circumference 13 of the vibration transmission member 11. Therefore, the thickness of the piezoelectric motor 10 in the 1γ direction (vertical direction in FIG. 1) can be made thinner, thereby making the piezoelectric motor 10 thinner and smaller. I can do it. Also, the protrusion 14a
The vibration transmission member 11 with ~14d is easy to manufacture, for example by stamping, and therefore, compared to the piezoelectric motor 1 of the prior art,! ! The residual shift can be significantly reduced.
効 果
以上のように、本発明に従えば、円板状の圧電素子の半
径方向外周部には、同軸に固定されｔこ円環状の振動伝
達部材が配置される。この撮動伝達部材の半径方向外周
部において、半径方向外方に突出しかつ半径方向に関し
て傾斜した弾性突起が形成される。またこのような振動
伝達部材を周方向に外囲して、半径方向内周面が前記弾
性突起に当接可能な環状の回転部材を配置した。したが
って、圧電素子の半径方向への伸長変位によって弾性突
起の基端部は、半径方向外方に変位され、かつその先端
部は回転体の内周面に当接する。Effects As described above, according to the present invention, an annular vibration transmission member fixed coaxially is disposed on the radial outer circumference of the disc-shaped piezoelectric element. At the radially outer circumferential portion of the image capturing and transmitting member, an elastic protrusion that projects radially outward and is inclined in the radial direction is formed. Further, an annular rotating member was disposed surrounding the vibration transmitting member in the circumferential direction, and the radially inner circumferential surface of the vibration transmitting member could come into contact with the elastic protrusion. Therefore, the base end of the elastic protrusion is displaced radially outward by the radial extension of the piezoelectric element, and the distal end comes into contact with the inner circumferential surface of the rotating body.
したがって、前記弾性突起は傾斜方向にたわみ、回転部
材を回転駆動する。一方、このような弾性突起は、振動
伝達部材の外周部に半径方向外方に延びて形成され、ま
た振動伝達部材は圧電素子の半径方向外周部に配置され
るようにした。また回転体の振動伝達部材を外囲して配
置した。すなわちこのような構成の圧電モータを、格段
に小形化することができる。また上述したような弾性突
起を有する振動伝達部材は、たとえば打ち抜き加工など
によって容易に製造でき、製造コストを格段に低減する
ことができる。Therefore, the elastic protrusion bends in the direction of inclination and rotationally drives the rotating member. On the other hand, such elastic protrusions are formed extending radially outward on the outer periphery of the vibration transmitting member, and the vibration transmitting member is disposed on the radial outer periphery of the piezoelectric element. Furthermore, the vibration transmitting member of the rotating body is arranged to be surrounded. That is, the piezoelectric motor having such a configuration can be significantly downsized. Furthermore, the vibration transmission member having the elastic protrusions as described above can be easily manufactured by, for example, punching, and manufacturing costs can be significantly reduced.
第１図は本発明の一実施例の圧電モータ１０の断面図、
第２図は圧電モータ１０の分解斜視図、第３図は振動伝
達部材１１の斜視図、１４図は振動伝達部材１１および
その突起１４に関する拡大乎面図、第５図は従来技術の
圧電モータ１の平面図、第６図は圧電セータ１の正面図
である。
１０・・・圧電モータ、１１・・・振動伝達部材、１２
・・・圧電素子、１４ａ〜１４ｄ・・・突起、１５・・
・回転子、２５・・・先端部
代理人 弁理士 西教 圭一部
第１図
第３図
第２図
第４図
第５図
第６図FIG. 1 is a sectional view of a piezoelectric motor 10 according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the piezoelectric motor 10, FIG. 3 is a perspective view of the vibration transmission member 11, FIG. 14 is an enlarged view of the vibration transmission member 11 and its protrusion 14, and FIG. 1 is a plan view of the piezoelectric sweater 1, and FIG. 6 is a front view of the piezoelectric sweater 1. 10... Piezoelectric motor, 11... Vibration transmission member, 12
...Piezoelectric element, 14a-14d...Protrusion, 15...
・Rotor, 25...Tip section agent Patent attorney Keiichi Saikyo Figure 1 Figure 3 Figure 2 Figure 4 Figure 5 Figure 6
Claims (1)
状の振動伝達部材であって、半径方向外周部において半
径方向外方に突出し、かつ半径方向に関して傾斜した弾
性突起を有する、そのような振動伝達部材と、 前記振動伝達部材を外囲し、半径方向内周面が前記弾性
突起に当接可能な環状の回転部材とを含むことを特徴と
する圧電モータ。[Scope of Claims] A disk-shaped piezoelectric element; an annular vibration transmission member coaxially fixed to a radial outer circumference of the piezoelectric element, the ring-shaped vibration transmission member protruding radially outward at the radial outer circumference; and an annular rotating member that surrounds the vibration transmission member and whose radially inner peripheral surface can come into contact with the elastic projection. A piezoelectric motor featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60264432A JPS62126873A (en) | 1985-11-25 | 1985-11-25 | Piezoelectric motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60264432A JPS62126873A (en) | 1985-11-25 | 1985-11-25 | Piezoelectric motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62126873A true JPS62126873A (en) | 1987-06-09 |
Family
ID=17403102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60264432A Pending JPS62126873A (en) | 1985-11-25 | 1985-11-25 | Piezoelectric motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62126873A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4959580A (en) * | 1987-02-28 | 1990-09-25 | Kievsky Politekhnichesky Institut Imeni | Piezoelectric motor |
| CH694540A5 (en) * | 1999-11-29 | 2005-03-15 | Miniswys Sa | Piezoelectric drive has resonator with mass distribution providing asymmetric oscillation in several directions in response to oscillation induced by piezoelectric element |
| JP2013030981A (en) * | 2011-07-28 | 2013-02-07 | Kddi Corp | Portable terminal device holder |
| US10075101B2 (en) | 2013-12-16 | 2018-09-11 | Canon Kabushiki Kaisha | Vibration type actuator |
-
1985
- 1985-11-25 JP JP60264432A patent/JPS62126873A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4959580A (en) * | 1987-02-28 | 1990-09-25 | Kievsky Politekhnichesky Institut Imeni | Piezoelectric motor |
| CH694540A5 (en) * | 1999-11-29 | 2005-03-15 | Miniswys Sa | Piezoelectric drive has resonator with mass distribution providing asymmetric oscillation in several directions in response to oscillation induced by piezoelectric element |
| JP2013030981A (en) * | 2011-07-28 | 2013-02-07 | Kddi Corp | Portable terminal device holder |
| US10075101B2 (en) | 2013-12-16 | 2018-09-11 | Canon Kabushiki Kaisha | Vibration type actuator |
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