JPH02192183A - Piezoelectric element - Google Patents

Piezoelectric element

Info

Publication number
JPH02192183A
JPH02192183A JP1011484A JP1148489A JPH02192183A JP H02192183 A JPH02192183 A JP H02192183A JP 1011484 A JP1011484 A JP 1011484A JP 1148489 A JP1148489 A JP 1148489A JP H02192183 A JPH02192183 A JP H02192183A
Authority
JP
Japan
Prior art keywords
piezoelectric element
conductive adhesive
conductor
piezoelectric
plunger
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
JP1011484A
Other languages
Japanese (ja)
Inventor
Osamu Tsutsui
修 筒井
Kinya Arita
欽也 有田
Mikio Sawai
澤井 巳喜夫
Masakatsu Kiyohara
正勝 清原
Hiroshi Horiuchi
啓史 堀内
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.)
Toto Ltd
Original Assignee
Toto 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 Toto Ltd filed Critical Toto Ltd
Priority to JP1011484A priority Critical patent/JPH02192183A/en
Publication of JPH02192183A publication Critical patent/JPH02192183A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To enable an assembly operation to be surely and easily made by a method wherein a conductor is provided to the peripheral face of a piezoelectric element, and an insulator is provided between the outer-peripheral edge of each conductive adhesive agent which faces the outer periphery of the piezoelectric element and the conductor. CONSTITUTION:Two conductors R are provided to the outer peripheral surface of a piezoelectric element Q and connected to the outside edge of conductive adhesive agent (p) exposed at the outer peripheral surface of the element Q, whereby the conductive adhesive agents (p) are electrically connected to a terminal w provided to a substrate (r). That is, an insulating agent or the like is applied to every other part between one of the conductors R and the conductive adhesive agents (p) to provide insulators As for blocking electric conduction, and also the insulator As is provided to a part between the other conductor R and the rest of the conductive adhesive agents (p) respectively, whereby a drive voltage can be applied to piezoelectric element pieces q1-qn. By this setup, a soldering operation can be dispensed with and the assembly operation of a piezoelectric element can be easily and surely executed.

Description

【発明の詳細な説明】 (イ) 産業上の利用分野 本発明は、圧電アクチュエータ等に用いる圧電素子に関
する。
DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a piezoelectric element used in a piezoelectric actuator or the like.

(ハ) 発明が解決しようとする課題 しかしながら、上記の圧電素子には次のような問題点が
ある。
(c) Problems to be Solved by the Invention However, the piezoelectric element described above has the following problems.

■ 手作業で位置合せしながら各圧電素子片を積層する
のでは、積層の組立精度を高めることかできない。
■ Laminating each piezoelectric element piece while aligning it manually cannot improve the assembly accuracy of the stack.

■ 各圧電素子片間に銅箔小片が介在するため、各圧電
素子を平行に積層することができない。
(2) Since a small piece of copper foil is interposed between each piezoelectric element piece, piezoelectric elements cannot be stacked in parallel.

■ 銀箔小片が破断しやすいため、リードワイヤのハン
ダ付けがやりにくく手間がかかる。
■ Small pieces of silver foil break easily, making it difficult and time-consuming to solder the lead wires.

■ 銅箔小片やリードワイヤが変形しやすいので、これ
らが接触しショートすることがあるという欠点かあった
■ Since the copper foil pieces and lead wires are easily deformed, there was a drawback that they could come into contact and cause a short circuit.

(ニ) 課題を解決するための手段 本発明では、複数個の圧電素子片間に導電性接着剤を介
在させて積層した圧電素子において、圧電素子の外周面
に導電体を設けると共に、圧電素子の外周に臨んな各導
電性接着剤の外周縁と導電体との間に絶縁部を設けてな
る圧電素子を提供せんとするものである。
(d) Means for Solving the Problems In the present invention, in a piezoelectric element laminated with a conductive adhesive interposed between a plurality of piezoelectric element pieces, a conductor is provided on the outer circumferential surface of the piezoelectric element, and the piezoelectric element It is an object of the present invention to provide a piezoelectric element in which an insulating part is provided between the outer periphery of each conductive adhesive facing the outer periphery of the piezoelectric element and the conductor.

(ホ) 作用・効果 本発明では、電極を接続するのに、細銅線を廃して、各
圧電素子の外周面に導電体を設けて各導電性接着剤を接
続するようにし、圧電素子の外周に臨んだ各導電性接着
剤の外周縁と導電体との間に選択的に設けた絶縁部によ
って、その導電性接着剤と導電体との接続を阻止して各
圧電素子片に電圧を印加することができる。
(e) Functions and Effects In the present invention, to connect the electrodes, a thin copper wire is eliminated, and a conductor is provided on the outer circumferential surface of each piezoelectric element to connect each conductive adhesive. An insulating part selectively provided between the outer periphery of each conductive adhesive facing the outer periphery and the conductor prevents the connection between the conductive adhesive and the conductor and applies voltage to each piezoelectric element piece. can be applied.

また、銀箔小片の介装を要しないのて、各圧電素子片を
平行に積層することができる。
In addition, the piezoelectric element pieces can be stacked in parallel without the need for intervening small pieces of silver foil.

また、上記導電体は銀箔小片やリードワイヤなどと異な
り変形しにくいので、圧電素子の取扱中にショートした
りするのか防止される。
Furthermore, unlike small pieces of silver foil or lead wires, the conductor is not easily deformed, so short circuits can be prevented during handling of the piezoelectric element.

上記のように、導電体で電極の導通を行うことから、ハ
ンダ付は等の面倒な作業を要せず、圧電素子の組み立て
作業が極めて簡易になるという効果がある。
As described above, since the electrodes are electrically connected by the conductor, troublesome work such as soldering is not required, and the piezoelectric element assembly work is extremely simple.

(へ)実施例 第1図、第2図は本発明の実施例を示しており、それぞ
れ所定厚さを有する略リング状の圧電素子片(q1)〜
(qn)の両面と、基板(r)の接着面とに銀ペースト
等の導電性接着剤(p)をスクリーン印刷等の手法を用
いて塗布し、これらを積層接着して一体の圧電素子(0
)を構成しており、各圧電素子片(ql)〜・(qn)
間の導電性接着剤(p)の外側縁は、圧電素子(Q)の
外周面に露出している。
(F) Embodiment FIGS. 1 and 2 show embodiments of the present invention, each of which has a substantially ring-shaped piezoelectric element piece (q1) having a predetermined thickness.
A conductive adhesive (p) such as silver paste is applied to both sides of (qn) and the adhesive surface of the substrate (r) using a method such as screen printing, and these are laminated and bonded to form an integrated piezoelectric element ( 0
), and each piezoelectric element piece (ql) ~・(qn)
The outer edge of the conductive adhesive (p) between them is exposed on the outer peripheral surface of the piezoelectric element (Q).

このようにして一体に積層接着された圧電素子(Q)で
は、圧電素子片(q1)〜(qn)間に介在した導電性
接着剤(p)を@極として利用することができる。
In the piezoelectric element (Q) integrally laminated and bonded in this manner, the conductive adhesive (p) interposed between the piezoelectric element pieces (q1) to (qn) can be used as the @ pole.

そして、圧電素子(Q)の外周面に2個の導電体(R)
を設け、同外周面に露出した導電性接着剤の外側縁に接
続させる事により、次のように各導電性接着剤(p)を
基板fr)に設けたターミナル(W)に導通させるよう
にしている。
Then, two conductors (R) are placed on the outer peripheral surface of the piezoelectric element (Q).
By connecting to the outer edge of the conductive adhesive exposed on the outer peripheral surface, each conductive adhesive (p) is electrically connected to the terminal (W) provided on the substrate fr) as follows. ing.

すなわち、一方の導電体(R)と導電性接着剤(p)と
の間に、選択的、つまり、圧電素子(Q)の一端から一
つ置きに絶縁剤等を塗布して絶縁部(^S)を設けて導
通を阻止すると共に、残りの導電性接着剤(1))と他
方の導電体(R)との開に絶縁部(As)を設りること
で、各圧電素子片(ql)〜(on)に駆動電圧を印加
する事かできるようにしている。
That is, between one conductor (R) and the conductive adhesive (p), an insulating agent or the like is applied selectively, that is, every other piezoelectric element (Q) from one end to form an insulating part (^ S) to prevent conduction, and by providing an insulating part (As) between the remaining conductive adhesive (1)) and the other conductor (R), each piezoelectric element piece ( It is possible to apply a driving voltage to ql) to (on).

導電体(R)は、まず、導電性接着剤(p)の外側端に
絶縁剤を塗布するなどして絶縁部(^S)を形成した後
、銀を蒸着させたり、導電性接着剤を塗布するなどして
形成することができ、ハンダ付は作業を要せず圧電素子
の組立作業が簡易になる。
The conductor (R) is made by first forming an insulating part (^S) by applying an insulating agent to the outer edge of the conductive adhesive (p), and then depositing silver or applying the conductive adhesive. It can be formed by coating, etc., and does not require soldering, which simplifies the assembly work of the piezoelectric element.

なお、各圧電素子片(ql)〜(an)の素材は、例え
ば、ABO3ペロブスカイト形の結晶構造をもつ強誘電
材料であって、PZT (Pb (Zr、Ti )03
〕系や、PLZT [Pb、La、(Zr、Ti )0
3〕系、PT CPbTi0a )系、あるいはPZT
を基にしな3成分系の圧電セラミックス等を用いること
ができる。
The material of each piezoelectric element piece (ql) to (an) is, for example, a ferroelectric material having an ABO3 perovskite crystal structure, such as PZT (Pb (Zr, Ti)03
] system, PLZT [Pb, La, (Zr, Ti)0
3] system, PT CPbTi0a) system, or PZT
A three-component piezoelectric ceramic based on the above can be used.

また、基板(r)には、ガラスエポキシ基板等を用いる
事も考えられるが、本実施例では耐熱性及び機械的強度
に優れたセラミック基板を使用し、導電性接着剤(p)
に銀ペーストを使用して、積層した圧電素子片(q1)
〜(qn)と基板(r)を加圧しながら約700°Cで
焼付は接着して一体の圧電素子(Q)を構成して、圧電
素子片(q1)〜(qn)と基板(r)の接着強度を高
めると共に、銀ペースト中の銀の微粒子を相互に溶着さ
せて導電性を高めている。
Although it is possible to use a glass epoxy substrate etc. as the substrate (r), in this example, a ceramic substrate with excellent heat resistance and mechanical strength is used, and a conductive adhesive (p) is used.
Piezoelectric element pieces laminated using silver paste (q1)
~(qn) and the substrate (r) are baked at approximately 700°C while applying pressure to form an integrated piezoelectric element (Q), and the piezoelectric element pieces (q1) to (qn) and the substrate (r) are bonded together. In addition to increasing the adhesive strength of the silver paste, the silver particles in the silver paste are welded together to improve conductivity.

次いで、上記のようにして積層構成した圧電素子を用い
た圧電アクチュエータ(八)について説明する。
Next, a piezoelectric actuator (8) using piezoelectric elements laminated as described above will be described.

第3図で示すように、前後壁(aHb)を具備する筒状
のケース内に同心円的に、がっ、軸線に沿って進退自在
にプランジャ(P)を配設し、同プランジャ(P)の外
周に、それぞれクランプ部材(k)(1)を具備する一
対のクランプ用圧電索子(13)(f)と、ストローク
用圧電素子(q)とを配設することによって構成してい
る。
As shown in Fig. 3, a plunger (P) is disposed concentrically within a cylindrical case having front and rear walls (aHb) so as to be movable back and forth along the axis. A pair of clamping piezoelectric cords (13) (f) each having a clamping member (k) (1) and a stroke piezoelectric element (q) are arranged on the outer periphery of the rod.

すなわち、クランプ用圧電素子(e)は、ケースめ中央
部に取付すな保持具(h)の下側に配設・支持されてお
り、一方、クランプ用圧電素子ff)と、ストローク用
圧電素子(g)とは保持具(h)の上側に配設・支持さ
れている。
That is, the clamping piezoelectric element (e) is not attached to the center of the case, but is arranged and supported on the lower side of the holder (h), while the clamping piezoelectric element ff) and the stroke piezoelectric element (g) is arranged and supported above the holder (h).

次に、各圧電素子(e)(f)(g)の作用について説
明する。
Next, the action of each piezoelectric element (e), (f), and (g) will be explained.

圧電素子(elf)は、電圧を印加するとクランプ部材
(k)(+)を介して1ランジヤ(P)をクランプし、
電圧を印加していないときは上記クランプを解除する。
When a voltage is applied to the piezoelectric element (ELF), it clamps the 1-langeer (P) via the clamp member (k) (+),
When no voltage is applied, the above clamp is released.

一方、圧電素子(g)は、電圧を印加すると軸線方向に
短縮し、上記電圧を解除すると伸長して復位するように
している。
On the other hand, the piezoelectric element (g) is configured to shorten in the axial direction when a voltage is applied, and to expand and return to its original position when the voltage is removed.

第4図に、上記構成を有する圧電アクチュエータ(八)
を制御するための制御装置(C)の構成を示しており、
同制御装置(C)は、マイクロプロセッサ(MPU)と
、駆動信号を出力するスイッチ(し)等と接続した入力
インターフェース(1)と、駆動回路(I))を介して
圧電素子(e)(f)(g)と接続した出力インターフ
ェース(1)と、圧電素子(e)(fHg)の駆動プロ
グラムを記憶したメモリ(M)とで構成されている。
FIG. 4 shows a piezoelectric actuator (8) having the above configuration.
It shows the configuration of the control device (C) for controlling the
The control device (C) connects a piezoelectric element (e) ( It consists of an output interface (1) connected to the piezoelectric elements (e) and (fHg), and a memory (M) that stores a drive program for the piezoelectric elements (e) and (fHg).

ついで、かかる構成を有するアクチュエータ(^)によ
るプランジャ(P)の移動について、第5図〜第8図を
参照して説明する。
Next, the movement of the plunger (P) by the actuator (^) having such a configuration will be explained with reference to FIGS. 5 to 8.

制御装置(C)に駆動信号が入力すると、前記プログラ
ムに従って、第5図に示すように、圧電素子(f)に電
圧を印加してプランジャCP)をクランプし、しかるの
ち、圧電素子(e)への電圧を止めてプランジャ(P)
のクランプを解除する。
When a drive signal is input to the control device (C), according to the program, a voltage is applied to the piezoelectric element (f) to clamp the plunger CP), as shown in FIG. 5, and then the piezoelectric element (e) Stop the voltage to the plunger (P)
Release the clamp.

次に、第6図に示すように、圧電素子(g)に電圧を印
加して収縮させると、圧電素子(g)は矢印方向に移動
し、これに伴い圧電素子(f)がクランプしたプランジ
ャ(P)も矢印方向に移動する。
Next, as shown in FIG. 6, when a voltage is applied to the piezoelectric element (g) to cause it to contract, the piezoelectric element (g) moves in the direction of the arrow, and as a result, the piezoelectric element (f) engages the clamped plunger. (P) also moves in the direction of the arrow.

その後、第7図に示すように、圧電素子(e)に電圧を
印加してプランジャ(P)をクランプし、しかるのち、
圧電素子(f)の印加電圧を解除してプランジャ(P)
のクランプを解除する。
Thereafter, as shown in FIG. 7, a voltage is applied to the piezoelectric element (e) to clamp the plunger (P), and then,
Release the voltage applied to the piezoelectric element (f) and release the plunger (P).
Release the clamp.

そして、第8図で示すように、圧電素子(g)への印加
電圧を解除して伸長させ、圧電索子(f)だけを矢印方
向に移動させ、第5図の状態に復帰させる。
Then, as shown in FIG. 8, the voltage applied to the piezoelectric element (g) is released and expanded, and only the piezoelectric cord (f) is moved in the direction of the arrow, returning to the state shown in FIG. 5.

その後、上記動作を繰り返すことにより、プランジャ(
P)を、μmオーダ或いはサブμmオーダのスl〜ロー
クで尺とり生状に移動することができ、各種装置や機械
等を精密に動作させることができる。
After that, by repeating the above operation, the plunger (
P) can be moved in a linear manner with a stroke of μm order or sub-μm order, and various devices, machines, etc. can be operated precisely.

第9図は本発明の圧電アクチュエータ(八)でダイヤフ
ラム型の弁体を駆動するように構成した自動弁(V)で
あり、(10)は弁箱であって、それぞれ−次配管と、
二次配管とに連通連結する流入路(11)と流出路(1
2)とを設けている。また、弁箱(10)内において、
流入路(11)と流出路(12)との間には、主弁孔(
13)が形成され、主弁孔(13)の上端開口周縁には
主弁座(14)が形成されている。
FIG. 9 shows an automatic valve (V) configured to drive a diaphragm-type valve body with a piezoelectric actuator (8) of the present invention, and (10) is a valve box, which is connected to the following piping,
An inlet passage (11) and an outlet passage (1
2). Moreover, in the valve box (10),
A main valve hole (
13) is formed, and a main valve seat (14) is formed at the periphery of the upper end opening of the main valve hole (13).

そして、主弁座(14)上には、主弁孔(13)を開閉
する主弁体を兼ねたダイヤフラム(15)か接離自在に
配設されている。
A diaphragm (15), which also serves as a main valve element for opening and closing the main valve hole (13), is disposed on the main valve seat (14) so as to be movable toward and away from the main valve seat (14).

ダイヤフラム(15)の上方にはダイヤフラム背室(1
6)が形成されており、同タイヤフラム背室(16)は
、タイヤフラム(15)の周縁に設けたオリフィス(1
7)を介して流入路(11)と連通している。
Above the diaphragm (15) is the diaphragm back chamber (1
6) is formed, and the tire flamm back chamber (16) is formed with an orifice (1
7) and communicates with the inflow channel (11).

(18)はダイヤフラム(15)に穿設したパイロット
弁孔であり、ダイヤプラム背室(16)と流出路(12
)とを連通させている。
(18) is a pilot valve hole bored in the diaphragm (15), which includes a diaphragm back chamber (16) and an outflow passage (12).
) are in communication.

パイロット弁孔(18)の上方には圧電アクチュエータ
(A)のプランジャCP)の下端に設けたパイロット弁
体(19)を対峙させて、圧電アクチュエータ(^)の
作動によりパイロット弁孔(18)を開閉させる。
Above the pilot valve hole (18), a pilot valve body (19) provided at the lower end of the plunger CP of the piezoelectric actuator (A) is opposed, and the pilot valve hole (18) is opened by the operation of the piezoelectric actuator (^). Open and close.

上記の構成により、自動弁(v)はダイヤフラム型の弁
体か有するセルフサーボ作用で、ダイヤプラム(15)
が圧電アクチュエータ(^)のプランジャ(P)の動き
を追従して主弁座(14)を開閉するものである。
With the above configuration, the automatic valve (v) has a self-servo action having a diaphragm type valve body, and the diaphragm (15)
follows the movement of the plunger (P) of the piezoelectric actuator (^) to open and close the main valve seat (14).

(20)はプランジャ(P)の上下ストロークを制限す
るフランジ、(21)はY型断面のシールである。
(20) is a flange that limits the vertical stroke of the plunger (P), and (21) is a seal with a Y-shaped cross section.

^S):絶縁部 R:導電体 Q :圧電素子 p :導電性接着剤 q)〜(qn) :圧電素子片 r :基板^S): Insulation section R: conductor Q: Piezoelectric element p: Conductive adhesive q) ~ (qn): Piezoelectric element piece r: Substrate

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

第1図、第2図は本発明実施例の断面側面図及び展開斜
視図、第3図は圧電アクチュエータの断面説明図、第4
図は制御装置の構成を示すブロック図、第5図〜第8図
は同アクチュエータの作動説明図、第9図は本発明の圧
電アクチュエータで構成した自動弁の断面図、第10図
は従来の圧電素子片の斜視図。
1 and 2 are a cross-sectional side view and an exploded perspective view of an embodiment of the present invention, FIG. 3 is a cross-sectional explanatory view of a piezoelectric actuator, and FIG.
The figure is a block diagram showing the configuration of the control device, Figures 5 to 8 are explanatory diagrams of the operation of the same actuator, Figure 9 is a sectional view of an automatic valve constructed using the piezoelectric actuator of the present invention, and Figure 10 is a conventional valve. A perspective view of a piezoelectric element piece.

Claims (1)

【特許請求の範囲】[Claims] 1)複数個の圧電素子片(q1)〜(qn)間に導電性
接着剤(p)を介在させて積層した圧電素子(Q)にお
いて、圧電素子(Q)の外周面に導電体(R)を設ける
と共に、圧電素子(Q)の外周に臨んだ各導電性接着剤
(p)の外周縁と導電体(R)との間に絶縁部(As)
を設けてなる圧電素子。
1) In a piezoelectric element (Q) laminated with a conductive adhesive (p) interposed between a plurality of piezoelectric element pieces (q1) to (qn), a conductor (R ), and an insulating part (As) is provided between the outer periphery of each conductive adhesive (p) facing the outer periphery of the piezoelectric element (Q) and the conductor (R).
A piezoelectric element equipped with
JP1011484A 1989-01-19 1989-01-19 Piezoelectric element Pending JPH02192183A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1011484A JPH02192183A (en) 1989-01-19 1989-01-19 Piezoelectric element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1011484A JPH02192183A (en) 1989-01-19 1989-01-19 Piezoelectric element

Publications (1)

Publication Number Publication Date
JPH02192183A true JPH02192183A (en) 1990-07-27

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JP1011484A Pending JPH02192183A (en) 1989-01-19 1989-01-19 Piezoelectric element

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04174570A (en) * 1990-11-07 1992-06-22 Murata Mfg Co Ltd Laminated piezoelectric parts

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61216368A (en) * 1985-03-20 1986-09-26 Nec Corp Electric distortion effect element
JPS6229087A (en) * 1985-07-30 1987-02-07 神鋼電機株式会社 Electromagnetic desulphurizer
JPS62290187A (en) * 1986-06-07 1987-12-17 Tohoku Metal Ind Ltd Cylindrical piezoelectric actuator and manufacture thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61216368A (en) * 1985-03-20 1986-09-26 Nec Corp Electric distortion effect element
JPS6229087A (en) * 1985-07-30 1987-02-07 神鋼電機株式会社 Electromagnetic desulphurizer
JPS62290187A (en) * 1986-06-07 1987-12-17 Tohoku Metal Ind Ltd Cylindrical piezoelectric actuator and manufacture thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04174570A (en) * 1990-11-07 1992-06-22 Murata Mfg Co Ltd Laminated piezoelectric parts

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