JPH0317230B2 - - Google Patents
Info
- Publication number
- JPH0317230B2 JPH0317230B2 JP58126730A JP12673083A JPH0317230B2 JP H0317230 B2 JPH0317230 B2 JP H0317230B2 JP 58126730 A JP58126730 A JP 58126730A JP 12673083 A JP12673083 A JP 12673083A JP H0317230 B2 JPH0317230 B2 JP H0317230B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric body
- piezoelectric
- mounting member
- displacement
- connecting member
- 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
- 238000006073 displacement reaction Methods 0.000 claims description 18
- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000005452 bending Methods 0.000 description 15
- 239000002184 metal Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
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
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
- H02N2/04—Constructional details
- H02N2/043—Mechanical transmission means, e.g. for stroke amplification
Landscapes
- Piezo-Electric Transducers For Audible Bands (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Description
【発明の詳細な説明】 本発明は圧電アクチユエータに関する。[Detailed description of the invention] The present invention relates to piezoelectric actuators.
従来、電圧印加時に圧電体に発生する機械的変
位を機器の可動部へ伝達する圧電アクチユエータ
が、ドツト式印字ヘツドやリレー、位置決め機
構、スピーカなどのアクチユエータとして用いら
れている。 Conventionally, piezoelectric actuators that transmit mechanical displacement generated in a piezoelectric body when a voltage is applied to a movable part of a device have been used as actuators for dot-type print heads, relays, positioning mechanisms, speakers, and the like.
第１図は従来の圧電アクチユエータを示す側面
図である。同図において、下端を金属の取付部材
１に固定した圧電体２が機械的変位を生ずる駆動
源である。リード線３から圧電体２に駆動電圧を
印加したときに圧電体２が伸びて寸法歪に生じ、
この寸法歪は、圧電体２の上端に固定した金属の
接続部材４を押上げ、接続部材４と一体に形成さ
れた第１および第２の結合部材５および６を介し
て金属の第１および第２の可動部材９および１０
に伝達されて、それぞれ破線矢印ＡおよびＢで示
す向きの機械的変位を与える。第１および第２の
可動部材９および１０の下端はそれぞれ、第１お
よび第２の結合部材５および６から所定間隔をお
いた箇所で、金属の第３および第４の結合部材７
および８を介して取付部材１に接続している。従
つて上記の機械的変位が与えられると、第１およ
び第２の可動部材９および１０に回転モーメント
を生じ上端部にはそれぞれ破線矢印ＣおよびＤで
示す向きの拡大された変位を生ずる。この変位が
それぞれ金属板の第５および第６の結合部材１１
および１２を介して金属の第３の可動部材１３に
伝達されると、第３の可動部材１３の先端に破線
矢印Ｅで示す向きの拡大された変位を生じ、この
変位が機器の可動部（図示せず）へ伝達されて、
機器は所期の動作を行う。 FIG. 1 is a side view showing a conventional piezoelectric actuator. In the figure, a piezoelectric body 2 whose lower end is fixed to a metal mounting member 1 is a driving source that generates mechanical displacement. When a driving voltage is applied to the piezoelectric body 2 from the lead wire 3, the piezoelectric body 2 stretches and dimensional distortion occurs.
This dimensional distortion pushes up the metal connecting member 4 fixed to the upper end of the piezoelectric body 2, and the metal first and second connecting members 5 and 6, which are integrally formed with the connecting member 4, are pushed up. Second movable members 9 and 10
are transmitted to give mechanical displacements in the directions indicated by dashed arrows A and B, respectively. The lower ends of the first and second movable members 9 and 10 are connected to third and fourth metallic coupling members 7 at a predetermined distance from the first and second coupling members 5 and 6, respectively.
and 8 to the mounting member 1. Therefore, when the above-mentioned mechanical displacement is applied, a rotational moment is generated in the first and second movable members 9 and 10, and an enlarged displacement in the direction indicated by dashed arrows C and D is generated at the upper end portions, respectively. This displacement causes the fifth and sixth coupling members 11 of the metal plates to
and 12 to the metal third movable member 13, it causes an enlarged displacement in the direction indicated by the dashed arrow E at the tip of the third movable member 13, and this displacement causes the movable part of the device ( (not shown) is transmitted to
The device performs the intended operation.
このようにな従来の圧電アクチユエータには、
繰返し動作時に圧電体２が折れたりあるいは圧電
体２の端部の固定箇所がはがれたりして故障を生
じ易いという欠点がある。すなわち、第３の可動
部材１３の先端から機器の可動部へ変位を伝達し
たときに、機器の可動部から受ける反力が、圧電
体２の寸法歪が伝達されるとは逆の経路を経て、
接続部材４に伝達される。接続部材４に伝達され
作用する反力は、破線矢印ＡおよびＢの向きに対
し逆向きの成分すなわち圧電体２に圧縮応力を作
用させる成分のほかに、破線矢印ＡおよびＢの向
きに直交する成分すなわち圧電体２に曲げ応力を
作用させる成分をもつ場合が多く、この曲げ応力
が繰返し作用したとき、その大きさが疲労限度を
越えて圧電体２が折れたりあるいは圧電体２の固
定端がはがれたりすることが多い。 In this way, conventional piezoelectric actuators have
There is a drawback that the piezoelectric body 2 is easily broken during repeated operations, or the fixing points at the ends of the piezoelectric body 2 are peeled off, resulting in a failure. That is, when the displacement is transmitted from the tip of the third movable member 13 to the movable part of the device, the reaction force received from the movable part of the device is transmitted through the opposite path to the dimensional strain of the piezoelectric body 2. ,
The signal is transmitted to the connecting member 4. The reaction force that is transmitted to and acts on the connecting member 4 includes a component that is opposite to the direction of the broken line arrows A and B, that is, a component that applies compressive stress to the piezoelectric body 2, and a reaction force that is perpendicular to the direction of the broken line arrows A and B. In many cases, the piezoelectric body 2 has a component that applies bending stress to the piezoelectric body 2, and when this bending stress acts repeatedly, the magnitude exceeds the fatigue limit and the piezoelectric body 2 may break or the fixed end of the piezoelectric body 2 may break. It often peels off.
本発明の目的は、上述の欠点を除去し繰返し動
作時に圧電体に過大な曲げ応力が作用せず従つて
圧電体の折損や圧電体の固定端のはがれを生じな
い圧電アクチユエータを提供することにある。 An object of the present invention is to provide a piezoelectric actuator that eliminates the above-mentioned drawbacks and does not apply excessive bending stress to the piezoelectric body during repeated operations, and therefore does not cause breakage of the piezoelectric body or peeling off of the fixed end of the piezoelectric body. be.
本発明のアクチユエータは、電極に印加される
駆動電圧に応答して長さ方向に寸法歪を発生する
棒状の圧電体と、該圧電体の一方の端部を支持す
る取付部材と前記圧電体の他方の端部を支持し且
つ前記取付部材に係合している機械部材とを有し
前記圧電体が発生する前記寸法歪に応答して所定
の向きの変位を発生する変位伝達部材と、該変位
伝達部材の前記圧電体の両端部を前記支持する二
つの支持箇所のうちの少なくとも一方の支持箇所
および該支持箇所で支持される前記圧電体の端部
の両者間に介在し該両者を接続しており前記圧電
体の前記長さ方向に直交して作用する外力の向き
に対し板面が直交するよう配設した可撓板の少な
くとも一つの結合部材とを備えている。 The actuator of the present invention includes a rod-shaped piezoelectric body that generates dimensional strain in the length direction in response to a driving voltage applied to an electrode, a mounting member that supports one end of the piezoelectric body, and a mounting member that supports one end of the piezoelectric body. a mechanical member supporting the other end and engaging the mounting member, and generating displacement in a predetermined direction in response to the dimensional strain generated by the piezoelectric body; interposed between at least one of the two support locations that support both ends of the piezoelectric body of the displacement transmission member and the end of the piezoelectric body supported at the support location, and connects the two; and at least one coupling member of a flexible plate arranged such that the plate surface is perpendicular to the direction of an external force acting perpendicularly to the longitudinal direction of the piezoelectric body.
次に図面を参照して本発明を詳細に説明する。 Next, the present invention will be explained in detail with reference to the drawings.
２図は本発明の第１の実施例を示す側面図であ
る。同図のアクチユエータでは、圧電体２の下端
を直接取付部材１に固定せずに、金属板の第７の
結合部材１５を介し取付部材１に接続している接
続部材１４を取付部材１と一体に形成しておき、
圧電体２の下端を接続部材１４上に固定した点
が、従来のアクチユエータとは異なる。接続部材
１４は、第２図における左右方向の幅および奥行
方向の厚さともに圧電体２とほぼ同寸法である。
これと取付部材１とを連結している結合部材１５
の奥行方向の厚さは、接続部材１４と同寸法であ
るが、結合部材１５の左右方向の幅は、第２図に
示すごとく、接続部材４の幅よりも狭くしてあ
る。このような板状の結合部材１５を介設するこ
とにより、圧電体２の取付部材１への付け根の箇
所に可撓性を付与してある。動作時には接続部材
１４に伝達される反力が圧電体２に曲げ応力を作
用させる向きの成分を含んでいても、その曲げ応
力は第７の結合部材１５に集中作用してこれを屈
曲させ、圧電体２には殆んど作用しない。従つ
て、圧電体２に作用する曲げ応力は従来と比べて
著しく軽減され、繰返し動作時での圧電体２の折
損や圧電体２の固定端のはがれ防ぐことができ
る。 FIG. 2 is a side view showing the first embodiment of the present invention. In the actuator shown in the figure, the lower end of the piezoelectric body 2 is not directly fixed to the mounting member 1, but the connecting member 14, which is connected to the mounting member 1 through the seventh coupling member 15 made of a metal plate, is integrated with the mounting member 1. Form it into
This actuator differs from conventional actuators in that the lower end of the piezoelectric body 2 is fixed onto the connecting member 14. The connecting member 14 has approximately the same dimensions as the piezoelectric body 2 in both the width in the left-right direction and the thickness in the depth direction in FIG.
A connecting member 15 connecting this and the mounting member 1
The thickness in the depth direction is the same as that of the connecting member 14, but the width of the connecting member 15 in the left-right direction is narrower than the width of the connecting member 4, as shown in FIG. By interposing such a plate-shaped coupling member 15, flexibility is imparted to the base of the piezoelectric body 2 to the mounting member 1. During operation, even if the reaction force transmitted to the connecting member 14 includes a component that applies bending stress to the piezoelectric body 2, the bending stress concentrates on the seventh connecting member 15 and bends it. It hardly acts on the piezoelectric body 2. Therefore, the bending stress acting on the piezoelectric body 2 is significantly reduced compared to the conventional piezoelectric body, and breakage of the piezoelectric body 2 and peeling of the fixed end of the piezoelectric body 2 during repeated operations can be prevented.
第３図は本発明の第２の実施例を示す側面図で
ある。同図のアクチユエータでは、第１の実施例
と同様に圧電体２の下端を接続部材１４上に固定
するとともに、圧電体２の上端を接続部材１６下
に固定してある。接続部材１６は板状の第８の結
合部部材１７を介して接続部材４に接続し一体に
形成してある。動作時に圧電体２に曲げ応力を作
用させる向きの反力が伝達されても、その曲げ応
力は第７および第８の結合部材１５および１７に
集中作用してこれを屈曲させ、圧電体２には殆ん
ど作用しない。従つて、圧電体２に作用する曲げ
応力は著しく軽減でき、繰返し動作時の圧電体２
の折損や圧電体２の固定端のはがれを防止でき
る。 FIG. 3 is a side view showing a second embodiment of the invention. In the actuator shown in the figure, the lower end of the piezoelectric body 2 is fixed on the connecting member 14, and the upper end of the piezoelectric body 2 is fixed below the connecting member 16, as in the first embodiment. The connecting member 16 is connected to and integrally formed with the connecting member 4 via a plate-shaped eighth connecting member 17. Even if a reaction force is transmitted in a direction that applies bending stress to the piezoelectric body 2 during operation, the bending stress concentrates on the seventh and eighth coupling members 15 and 17, bending them, and causing the piezoelectric body 2 to bend. has almost no effect. Therefore, the bending stress acting on the piezoelectric body 2 can be significantly reduced, and the bending stress acting on the piezoelectric body 2 during repeated operations can be reduced significantly.
Breakage of the piezoelectric body 2 and peeling of the fixed end of the piezoelectric body 2 can be prevented.
圧電体２が短かい場合には、第１の実施例のご
とく圧電体２の下端を接続部材１４に固定するだ
けで、圧電体２の上端に作用する曲げ応力を充分
軽減できる。圧電体２が長くて下端を接続部材１
４に固定するだけでは圧電体２の上端に作用する
曲げ応力を充分軽減できない場合には、第２の実
施例のごとく圧電体２の両端をおのおの接続部材
１４および１６に接続すれば、圧電体２の両端に
作用する曲げ応力を充分軽減できる。 When the piezoelectric body 2 is short, the bending stress acting on the upper end of the piezoelectric body 2 can be sufficiently reduced by simply fixing the lower end of the piezoelectric body 2 to the connecting member 14 as in the first embodiment. The piezoelectric body 2 is long and its lower end is connected to the connecting member 1
If the bending stress acting on the upper end of the piezoelectric body 2 cannot be sufficiently reduced by simply fixing it to the upper end of the piezoelectric body 2, the piezoelectric body 2 can be The bending stress acting on both ends of 2 can be sufficiently reduced.
なお、第１および第２の実施例ではいずれも、
圧電体２の寸法歪を第１および第２の可動部材９
および１０のレバー作用により拡大して二つの逆
向きの変位を発生させ、これを第２の可動部材１
３に伝達する変位伝達機構を用いる場合を例示し
たが、この変位伝達機構に限定するものではな
い。変位伝達機構を適宜変更した場合でも、第１
あるいは第２の実施例と同様に、圧電体の一端あ
るいは両端を板状に接続することにより、繰返し
動作時の圧電体の折損や圧電体の固定端のはがれ
を防止するという効果が得られることは明らかで
ある。 Note that in both the first and second embodiments,
The dimensional distortion of the piezoelectric body 2 is reduced by the first and second movable members 9.
and 10 to generate two opposite displacements, which are transferred to the second movable member 1.
Although the case where a displacement transmission mechanism that transmits data to the third position is used as an example, the present invention is not limited to this displacement transmission mechanism. Even if the displacement transmission mechanism is changed appropriately, the first
Alternatively, as in the second embodiment, by connecting one or both ends of the piezoelectric body in a plate shape, it is possible to obtain the effect of preventing breakage of the piezoelectric body or peeling off of the fixed end of the piezoelectric body during repeated operations. is clear.
以上の説明により明らかなごとく、本発明には
繰返し動作時に圧電体に過大な曲げ応力が作用せ
ず従つて圧電体の折損や圧電体の固定端のはがれ
を生じない圧電アクチユエータを実現できるとい
う効果がある。 As is clear from the above explanation, the present invention has the advantage that it is possible to realize a piezoelectric actuator in which excessive bending stress does not act on the piezoelectric body during repeated operations, and therefore, the piezoelectric body does not break or the fixed end of the piezoelectric body does not come off. There is.
第１図は従来の圧電アクチユエータを示す側面
図、第２図および第３図はそれぞれ本発明の実施
例を示す側面図である。
１……取付部材、２……圧電体、３……リード
線、４，１４，１６……接続部材、５，６，７，
８，１１，１２，１５，１７……結合部材、９，
１０，１３……可動部材。
FIG. 1 is a side view showing a conventional piezoelectric actuator, and FIGS. 2 and 3 are side views showing embodiments of the present invention. 1... Mounting member, 2... Piezoelectric body, 3... Lead wire, 4, 14, 16... Connection member, 5, 6, 7,
8, 11, 12, 15, 17... coupling member, 9,
10, 13...Movable member.
Claims (1)
向に寸法歪を発生する棒状の圧電体と、該圧電体
の一方の端部を支持する取付部材と前記圧電体の
他方の端部を支持し且つ前記取付部材に係合して
いる機構部材とを有し前記圧電体が発生する前記
寸法歪に応答して所定の向きの変位を発生する変
位伝達部材と、該変位伝達部材の前記圧電体の両
端部を前記支持する二つの支持箇所のうちの少く
とも一方の支持箇所および該支持箇所で支持され
る前記圧電体の端部の両者間に介在し該両者を接
続しており前記圧電体の前記長さ方向に直交して
作用する外力の向きに対し板面が直交するよう配
設した可撓板の少くとも一つの結合部材とを備え
たことを特徴とする圧電アクチユエータ。1 A rod-shaped piezoelectric body that generates dimensional strain in the length direction in response to a driving voltage applied to an electrode, a mounting member that supports one end of the piezoelectric body, and a mounting member that supports the other end of the piezoelectric body. a displacement transmitting member that generates displacement in a predetermined direction in response to the dimensional strain generated by the piezoelectric body, the displacement transmitting member having a mechanism member supporting the mounting member and engaging the mounting member; The piezoelectric material is interposed between and connected to at least one of the two support locations that support both ends of the piezoelectric material and the end of the piezoelectric material supported by the support location. A piezoelectric actuator comprising at least one coupling member of a flexible plate arranged such that the plate surface is perpendicular to the direction of an external force acting perpendicularly to the longitudinal direction of the piezoelectric body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58126730A JPS6018980A (en) | 1983-07-12 | 1983-07-12 | Piezoelectric actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58126730A JPS6018980A (en) | 1983-07-12 | 1983-07-12 | Piezoelectric actuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6018980A JPS6018980A (en) | 1985-01-31 |
| JPH0317230B2 true JPH0317230B2 (en) | 1991-03-07 |
Family
ID=14942453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58126730A Granted JPS6018980A (en) | 1983-07-12 | 1983-07-12 | Piezoelectric actuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6018980A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62124437A (en) * | 1985-11-26 | 1987-06-05 | Nippon Telegr & Teleph Corp <Ntt> | Stress fatigue testing device |
| EP0407184A3 (en) * | 1989-07-06 | 1991-08-21 | Brother Kogyo Kabushiki Kaisha | Parallel link mechanism |
| WO1996014687A1 (en) * | 1994-11-07 | 1996-05-17 | Matsushita Electric Industrial Co., Ltd. | Piezoelectric actuator and pyroelectric infrared-ray sensor using the same |
| JP5030146B2 (en) * | 2007-02-14 | 2012-09-19 | Ｎｅｃトーキン株式会社 | Piezoelectric device for generating acoustic signals |
| USD808799S1 (en) | 2015-11-17 | 2018-01-30 | Hunter Fan Company | Carton with color striping |
-
1983
- 1983-07-12 JP JP58126730A patent/JPS6018980A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6018980A (en) | 1985-01-31 |
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