JPS6222408B2 - - Google Patents
Info
- Publication number
- JPS6222408B2 JPS6222408B2 JP2793381A JP2793381A JPS6222408B2 JP S6222408 B2 JPS6222408 B2 JP S6222408B2 JP 2793381 A JP2793381 A JP 2793381A JP 2793381 A JP2793381 A JP 2793381A JP S6222408 B2 JPS6222408 B2 JP S6222408B2
- Authority
- JP
- Japan
- Prior art keywords
- load
- piezoelectric elements
- detection
- voltage
- piezoelectric element
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 21
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 238000010586 diagram Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Description
【発明の詳細な説明】
この発明は被測定荷重を電気信号に変換して取
り出す荷重検出器に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load detector that converts a load to be measured into an electrical signal and extracts it.
圧電素子を使用し、外部からこの圧電素子に対
して時間的に荷重値が変化する被測定荷重を印加
し、この被測定荷重により生ずる圧電素子の変位
に対応して発生する電気信号を圧電素子の電極間
に得て、この得られた電気信号によつて圧電素子
に与えられる被測定荷重を検出することは行なわ
れている。しかし、時間的に荷重値が変化しない
静的な荷重の測定は、この従来の手段では実現す
ることは出来ない。 Using a piezoelectric element, a load to be measured whose load value changes over time is applied to the piezoelectric element from the outside, and an electric signal generated in response to the displacement of the piezoelectric element caused by this load to be measured is transmitted to the piezoelectric element. The load to be measured applied to the piezoelectric element is detected by the electrical signal obtained between the electrodes of the piezoelectric element. However, static load measurement in which the load value does not change over time cannot be achieved by this conventional means.
この発明はこの従来の荷重検出器における難点
を解決し、被測定荷重の測定範囲が調整可能であ
り、広範囲の静的な荷重に対して優れた変換特性
下での検出測定が可能な荷重検出器を提供するも
のである。 This invention solves the difficulties in conventional load detectors, and enables load detection with an adjustable measurement range of the load to be measured and detection measurement with excellent conversion characteristics for a wide range of static loads. It provides equipment.
この発明においては、複数個の圧電素子が互い
に重ね合わせて配設され、その配列方向において
これらの複数個の圧電素子をその両端間で受けて
固定支持する固定手段が設けられ、被測定荷重は
複数個の圧電素子の両端間に被検出荷重印加手段
により印加される。さらにこの発明においては、
調整電圧印加手段により重ね合わせて配設された
圧電素子中の変位用の圧電素子のそれぞれの電極
に対してこれらの変位用の圧電素子が同時に伸縮
するように調整電圧が印加される。又互いに重ね
合わせて配設された複数個の圧電素子中、調整電
圧印加手段により調整電圧が印加されない検出用
の圧電素子の電極端子間から被測定荷重に対応し
た検出電圧が取り出されるような構成を有する。
このような構成を有するためにこの発明によると
固定手段により複数個の圧電素子の配列方向に対
して与えられる締め付け力を調整し、又調整電圧
印加手段により、それぞれの変位用の圧電素子の
電極に与えられる調整電圧を調整することによ
り、測定可能な被測定荷重の範囲を拡大し、且つ
被測定荷重に応じて変換特性の優れた検出特性位
置において、被測定荷重の高精度の検出が可能と
なる。 In this invention, a plurality of piezoelectric elements are arranged one on top of the other, and a fixing means is provided for receiving and fixedly supporting the plurality of piezoelectric elements between both ends in the arrangement direction, and the load to be measured is The detected load is applied between both ends of the plurality of piezoelectric elements by means of applying the detected load. Furthermore, in this invention,
An adjustment voltage is applied by the adjustment voltage applying means to each electrode of the piezoelectric elements for displacement among the piezoelectric elements arranged one on top of the other so that these piezoelectric elements for displacement simultaneously expand and contract. Further, among a plurality of piezoelectric elements arranged one on top of the other, the detection voltage corresponding to the load to be measured is extracted from between the electrode terminals of the detection piezoelectric element to which no adjustment voltage is applied by the adjustment voltage applying means. has.
With such a configuration, according to the present invention, the fixing means adjusts the clamping force applied in the arrangement direction of the plurality of piezoelectric elements, and the adjusting voltage applying means adjusts the electrodes of the piezoelectric elements for displacement. By adjusting the adjustment voltage applied to the sensor, the range of measurable loads can be expanded, and the load can be detected with high precision at a detection characteristic position with excellent conversion characteristics according to the load to be measured. becomes.
以下、この発明の荷重検出器をその実施例に基
づき、図面を使用して詳細に説明する。先ず実施
例の具体的な説明に先立ち、圧電素子による荷重
検出の原理について説明する。 EMBODIMENT OF THE INVENTION Hereinafter, the load detector of this invention will be explained in detail based on the Example using drawing. First, prior to a specific explanation of the embodiment, the principle of load detection using a piezoelectric element will be explained.
第１図に示すように圧電素子１１の電極１２−
１，１２−２間に第２図に示すような同一極性の
繰り返し交番電圧Eiを印加すると、圧電素子１
１には偏倚Δl0範囲で伸長圧縮変形が生ずる。従
つて逆に圧電素子１１に外部から時間的変化を有
する繰返し荷重を印加して偏倚Δl0を発生させ、
この偏倚Δl0に対応して圧電素子１１の電極間に
発生する電圧を測定して印加された荷重を測定す
ることが出来る。しかしこの偏倚Δl0はその偏倚
範囲に限度があり、このような測定方法では小さ
な印加力に対応する荷重しか精度よく測定するこ
とは出来ない。 As shown in FIG.
When a repeating alternating voltage Ei of the same polarity as shown in FIG. 2 is applied between 1 and 12-2, the piezoelectric element 1
1, elongation-compression deformation occurs in the range of deviation Δl 0 . Therefore, conversely, by applying a repetitive load having a temporal change to the piezoelectric element 11 from the outside, a bias Δl 0 is generated,
The applied load can be measured by measuring the voltage generated between the electrodes of the piezoelectric element 11 in response to this bias Δl 0 . However, this deviation Δl 0 has a limit in its range, and with this measurement method, only loads corresponding to small applied forces can be measured with high accuracy.
第４図はこの発明の荷重検出器の実施例の構成
を示すもので、例えば円柱状の複数個の圧電素子
１１−１，１１−２，………１１−ｎが互いに重
ね合わせて配設され、この互いに重ね合わせて配
設された複数個の圧電素子１１−１，１１−２，
………１１−ｎに対してこれらの圧電素子１１−
１，１１−２，………１１−ｎを両端間で受けて
固定支持する固定手段が設けられる。各圧電素子
１１−１，１１−２，………１１−ｎにはその中
心位置を貫通して取付孔１４が形成され、互いに
重ね合わせて配設された圧電素子１１−１，１１
−２，………１１−ｎの取付孔１４に固定棒１５
が貫通挿入され、この固定棒１５の両端部分には
ねじが刻設される。この固定棒１５の両端部分に
設けられたねじに螺合するナツト１６−１，１６
−２により互いに重ね合わせて配設された複数個
の圧電素子１１−１，１１−２，………１１−ｎ
が固定棒１５により軸支固定可能に構成される。 FIG. 4 shows the configuration of an embodiment of the load detector of the present invention, in which, for example, a plurality of cylindrical piezoelectric elements 11-1, 11-2, . . . 11-n are arranged one on top of the other. A plurality of piezoelectric elements 11-1, 11-2,
………11-n, these piezoelectric elements 11-
1, 11-2, . . . 11-n is provided between both ends thereof. Each piezoelectric element 11-1, 11-2, .
-2,......11-n fixing rod 15 in the mounting hole 14
is inserted through the fixing rod 15, and screws are cut into both ends of the fixing rod 15. Nuts 16-1 and 16 are screwed into screws provided at both ends of this fixing rod 15.
-2, a plurality of piezoelectric elements 11-1, 11-2, ......11-n are arranged on top of each other
is configured so that it can be pivoted and fixed by a fixing rod 15.
このようにして互いに重ね合わせて配設された
複数個の圧電素子１１−１，１１−２，………１
１−ｎのｎ−１個の変位用の圧電素子１１−１〜
１１−（ｎ−１）の各電極に接続される調整電圧
線１７−１，１７−２が設けられその端子t1，t2
間から各圧電素子１１−１，１１−２，………１
１−ｎの電極１２−１，１２−２，１２−３，１
２−４，………１２（２ｎ−１）に対して調整電
圧Ｅiが印加可能に構成される。調整電圧Ｅiは互
いに重ね合わせて伸縮偏倚可能に配設された複数
個の変位用の圧電素子が同時に伸縮するような電
圧にされる。例えばこの調整電圧Eiは第２図に
示すように時間ｔに対して同一周期で同一波高値
のパルス電圧が繰り返して発生するような波形を
有する。複数個互いに重ね合わせて配設された圧
電素子中でこの調整電圧Eiが印加されない検出
用の圧電素子、第４図に示す実施例では最終段の
圧電素子１１−ｎの電極１２−（２ｎ−１），１２
−２ｎ間から出力電圧線１７−３，１７−４が取
り出され、その端子t3，t4間から被測定荷重Ｆに
対応して与えられる圧電素子の歪の抑圧度に応じ
た出力電圧E0が取り出される。又被測定荷重Ｆ
は、互いに重ね合わせて固定配設された複数個の
圧電素子１１−１，１１−２，………１１−ｎの
両端の圧電素子１１−１と１１−ｎに対してその
電極１２−１，１２−２ｎ端板に直角に印加され
る。 A plurality of piezoelectric elements 11-1, 11-2, .
1-n n-1 displacement piezoelectric elements 11-1~
Adjustment voltage lines 17-1 and 17-2 connected to each electrode of 11-(n-1) are provided, and their terminals t 1 and t 2 are provided.
Each piezoelectric element 11-1, 11-2, ......1 from between
1-n electrodes 12-1, 12-2, 12-3, 1
The adjustment voltage E i can be applied to 2-4, . . . 12 (2n-1). The adjustment voltage E i is set to such a voltage that a plurality of piezoelectric elements for displacement, which are arranged so as to be extensible and deflectable in a superimposed manner, simultaneously expand and contract. For example, as shown in FIG. 2, this adjustment voltage Ei has a waveform in which a pulse voltage of the same peak value is repeatedly generated at the same period with respect to time t. In the embodiment shown in FIG. 4, the electrode 12-(2n- 1), 12
Output voltage lines 17-3 and 17-4 are taken out from between terminals t 3 and t 4 of the output voltage lines 17-3 and 17-4, and output voltage E corresponding to the degree of suppression of distortion of the piezoelectric element applied in response to load F to be measured is output from between terminals t 3 and t 4. 0 is retrieved. Also, the load to be measured F
The electrode 12-1 is connected to the piezoelectric elements 11-1 and 11-n at both ends of a plurality of piezoelectric elements 11-1, 11-2, . , 12-2n are applied perpendicularly to the end plate.
この発明の検出器は実施例で説明したような構
成を有するため、互いに重ね合わせて配設された
複数個の圧電素子１１−１，１１−２，………１
１−ｎの配設状態での配設方向に対する固定手段
による締め付け力を固定棒１５に対するビス１６
−１，１６−２の締め付けを調整して所望の値に
設定することが出来る。 Since the detector of the present invention has the configuration described in the embodiment, a plurality of piezoelectric elements 11-1, 11-2, . . . 1 are arranged on top of each other.
The tightening force by the fixing means in the arrangement direction in the arrangement state of 1-n is applied to the screw 16 against the fixing rod 15.
The tightening of -1 and 16-2 can be adjusted to a desired value.
締め付け力は端子t1，t2間に印加される調整電
圧Eiに対する互いに重ね合わせて配設された複
数個の圧電素子の初期駆動条件を設定する。 The tightening force sets the initial driving conditions for the plurality of piezoelectric elements arranged one on top of the other with respect to the adjustment voltage Ei applied between the terminals t 1 and t 2 .
即ち、固定手段による締め付け力をf0として、
この状態で調整電圧Eiを複数個の圧電素子の各
電極に対して印加すれば、無荷重の状態で検出手
段に得られる出力電圧はE0として得られる。固
定手段による締め付け力をf1に増加させると、同
一の調整電圧Eiに対して無荷重の状態で検出手
段に得られる出力電圧はE1に変化する。 That is, if the tightening force by the fixing means is f 0 ,
If the adjustment voltage Ei is applied to each electrode of the plurality of piezoelectric elements in this state, the output voltage obtained by the detection means in the no-load state is obtained as E 0 . When the clamping force by the fixing means is increased to f 1 , the output voltage obtained by the detection means in a no-load state changes to E 1 for the same adjustment voltage Ei.
又、調整電圧Eiの波高値を増加させると、そ
れぞれ検出手段に得られる出力電圧の上下限値の
幅が拡大される。 Furthermore, when the peak value of the adjustment voltage Ei is increased, the width of the upper and lower limit values of the output voltage obtained by the detection means is expanded.
このようにして初期設定値f0が固定手段によつ
て設定されて互いに重ね合わせて配設された複数
個の圧電素子１１−１〜１１−ｎに対して、調整
電圧Ｅiによる偏倚を妨げる方向に被測定荷重Ｆ
が印加される。よく知られている圧電素子の動作
特性から、締め付け力f0の状態で被測定荷重F1に
印加すると、圧電素子f0＋F1に対応して内部歪が
抑圧される。この状態から被測定荷重をF1から
F2に増加させると、圧電素子はf0＋F2に対応して
内部歪が抑圧される。従つて調整電圧により伸縮
偏倚する変位用の圧電素子１１−１〜１１−（ｎ
−１）には被測定荷重に対応した応力が生じ、変
位用の圧電素子に接続される検出用の圧電素子１
１−ｎの出力電圧線１７−３，１７−４間に被測
定荷重の値に対応して、被測定荷重F2ではF1よ
り大きな出力電圧が得られる。 In this way, the initial setting value f 0 is set by the fixing means and prevents the biasing caused by the adjustment voltage E i to the plurality of piezoelectric elements 11-1 to 11-n arranged one on top of the other. The load to be measured F in the direction
is applied. From the well-known operating characteristics of a piezoelectric element, when a load to be measured F 1 is applied with a tightening force f 0 , internal strain is suppressed corresponding to the piezoelectric element f 0 +F 1 . From this state, change the load to be measured from F 1
When the value is increased to F 2 , internal distortion of the piezoelectric element is suppressed corresponding to f 0 +F 2 . Therefore, displacement piezoelectric elements 11-1 to 11-(n
-1) A stress corresponding to the load to be measured is generated, and the piezoelectric element 1 for detection is connected to the piezoelectric element for displacement.
Corresponding to the value of the load to be measured between the 1-n output voltage lines 17-3 and 17-4, a larger output voltage than F1 is obtained for the load to be measured F2 .
初期設定値f0に対して与える調整電圧の波高値
によつて検出手段に得られる出力電圧の幅を調整
することが出来る。又検出手段により出力端子間
には交流の検出電圧が得られるので、雑音による
誤差の影響を受けない安定した検出出力を得るこ
とが出来る。 The width of the output voltage obtained by the detection means can be adjusted by the peak value of the adjustment voltage applied to the initial setting value f 0 . Furthermore, since an alternating current detection voltage is obtained between the output terminals by the detection means, a stable detection output that is not affected by errors due to noise can be obtained.
第４図に示す実施例においては、同一極性の交
番印加電圧Eiを変位用の各圧電素子の電極に対
して印加して、変位用各圧電素子が同時に伸縮偏
倚するような構成としているが、圧電極性を有す
る圧電素子を使用し例えば印加電圧Eiを正負に
わたつて変化する交番電圧とし、互いに隣接する
圧電素子の圧電極性を逆にした配列として重ね合
わせて配設することも出来る。 In the embodiment shown in FIG. 4, an alternating applied voltage Ei of the same polarity is applied to the electrodes of each piezoelectric element for displacement, so that each piezoelectric element for displacement expands and contracts at the same time. It is also possible to use piezoelectric elements having piezoelectricity, for example, to set the applied voltage Ei to be an alternating voltage that changes between positive and negative, and to arrange adjacent piezoelectric elements in an arrangement in which the piezoelectricity is reversed so that they are stacked one on top of the other.
第５図に第４図の実施例と同一部分に同一符号
を付してその構成を示したのは、この発明の荷重
検出器の他の実施例で、この実施例は第４図の実
施例において弾性体１３を複数個の圧電素子１１
−１〜１１−ｎに重ね合わせて配設し、弾性体１
３の端部と圧電素子１１−１の端部間に荷重が印
加されるように構成されている。 FIG. 5 shows another embodiment of the load detector of the present invention, in which the same parts as those in the embodiment shown in FIG. 4 are denoted by the same reference numerals. In the example, the elastic body 13 is connected to a plurality of piezoelectric elements 11
-1 to 11-n, and the elastic body 1
3 and the end of the piezoelectric element 11-1.
この実施例によると弾性体１３の弾性定数K1
により全体の測定可能な変位量を拡大し、又弾性
体１３の弾性定数K1を変化させることにより測
定感度の調整を行なうことが出来る。即ちこの場
合、調整電圧Eiによる互いに重ね合わせて配設
された圧電素子の偏倚をΔl0とすると、全体の偏
倚ΔｘはΔｘ＝Δl0＋Ｆ／Ｋ１で与えられる。第５図の
実施例においては、弾性体１３を複数個重ね合わ
せて配設された圧電素子１１−１〜１１−ｎの最
終段の圧電素子１１−ｎに重ねて配設している
が、弾性体１３を複数個重ね合わせて配設された
圧電素子１１−１〜１１−ｎ内の任意の圧電素子
間に挿入して配設することも出来る。 According to this embodiment, the elastic constant K 1 of the elastic body 13
By increasing the overall measurable displacement amount, and by changing the elastic constant K1 of the elastic body 13, the measurement sensitivity can be adjusted. That is, in this case, if the deflection of the piezoelectric elements arranged superimposed on each other due to the adjustment voltage Ei is Δl 0 , then the overall deviation Δx is given by Δx=Δl 0 +F/K 1 . In the embodiment shown in FIG. 5, a plurality of elastic bodies 13 are disposed so as to overlap the final stage piezoelectric element 11-n of the piezoelectric elements 11-1 to 11-n, which are disposed in a stacked manner. It is also possible to insert and arrange the elastic body 13 between arbitrary piezoelectric elements in the piezoelectric elements 11-1 to 11-n arranged in a plurality of stacked layers.
このようにしてこの発明によれば、互いに重ね
合わせて配設される圧電素子の形状及び個数を選
定し、固定手段による締め付け力を調整し、更に
変位用の各圧電素子の電極間に印加される調整電
圧値を選択することにより、被測定荷重に対応し
た最適の初期条件を設定して直線性の優れた特性
領域での測定を可能とし、測定感度を向上させ、
更に被測定荷重範囲を拡大させることが出来る。
更に必要に応じて互いに重ね合わせて配設された
複数個の圧電素子に対して、弾性体を重ね合わせ
て配設させることにより偏倚を拡大させて荷重の
測定範囲を広めることが可能となる。 In this way, according to the present invention, the shape and number of the piezoelectric elements to be arranged one on top of the other are selected, the clamping force by the fixing means is adjusted, and the clamping force applied between the electrodes of each piezoelectric element for displacement is adjusted. By selecting the adjustment voltage value that corresponds to the load to be measured, it is possible to set the optimal initial conditions corresponding to the load being measured, making it possible to measure in a characteristic region with excellent linearity, improving measurement sensitivity,
Furthermore, the load range to be measured can be expanded.
Furthermore, if necessary, by disposing an elastic body in a superimposed manner on a plurality of piezoelectric elements disposed in a superimposed manner, it is possible to increase the bias and widen the measurement range of the load.
又この発明の荷重検出器は圧電素子を使用して
いるため消費電力が少なくてすみ、偏倚の経時変
化も殆んどなく、過渡特性も良好であり、調整電
圧Eiにより偏倚を発生させ、この偏倚に対応し
て荷重に応じて検出電圧を得る過程において電気
信号間の位相のずれは認められない。発明者の実
験によると、この発明では数Kgから数tonの範囲
の静的被測定荷重に対して高精度で安定な荷重の
検出を行なうことが可能であつた。 In addition, since the load detector of the present invention uses a piezoelectric element, it consumes less power, has almost no change in deviation over time, and has good transient characteristics. In the process of obtaining the detected voltage according to the load in response to the deviation, no phase shift between the electrical signals is observed. According to the inventor's experiments, the present invention was able to perform highly accurate and stable load detection for statically measured loads in the range of several kilograms to several tons.
以上詳細に説明したように、この発明の荷重検
出器によると静的被測定荷重に対応して最適の感
度及び直線性を実現して、広範囲の荷重に対応し
て高精度の荷重検出を行なうことが可能となる。 As explained in detail above, the load detector of the present invention achieves optimal sensitivity and linearity in response to statically measured loads, and performs highly accurate load detection in response to a wide range of loads. becomes possible.
第１図は圧電素子に対する荷重と電極間電圧と
の関係を示す原理図、第２図は調整電圧Eiの波
形例を示す図、第３図は圧電素子を二個重ね合わ
せて配設した状態での荷重と電極間電圧との関係
を示す原理図、第４図はこの発明の荷重検出器の
実施例の構成を示す図、第５図はこの発明の荷重
検出器の他の実施例の構成を示す図、第６図はこ
の発明の荷重検出器における荷重と検出電圧との
関係を示す図である。
１１，１１−１〜１１−ｎ：圧電素子、１２−
１〜１２−２ｎ：電極、１３：弾性体、１５：固
定棒、１６−１，１６−２：なつと、Ei：調整
電圧、Ｆ：荷重。
Figure 1 is a diagram showing the principle of the relationship between the load on the piezoelectric element and the voltage between the electrodes, Figure 2 is a diagram showing an example of the waveform of the adjustment voltage Ei, and Figure 3 is the state in which two piezoelectric elements are arranged one on top of the other. FIG. 4 is a diagram showing the configuration of an embodiment of the load detector of this invention, and FIG. 5 is a diagram of another embodiment of the load detector of this invention. FIG. 6, which is a diagram showing the configuration, is a diagram showing the relationship between the load and the detected voltage in the load detector of the present invention. 11, 11-1 to 11-n: piezoelectric element, 12-
1 to 12-2n: electrode, 13: elastic body, 15: fixed rod, 16-1, 16-2: summer, Ei: adjustment voltage, F: load.
Claims (1)
素子と、その重ね合わせて配設された複数個の圧
電素子をその両端間で保持して固定支持する固定
手段と、 前記複数個の圧電素子中の変位用の圧電素子の
それぞれの電極間にこれら変位用の圧電素子が同
時に伸縮偏倚するように調整電圧を印加する調整
電圧印加手段と、 前記複数個の圧電素子の両端間に前記偏倚を抑
圧するように被検出荷重を印加する被検出荷重印
加手段と、 前記複数個の圧電素子中の前記調整電圧印加手
段により調整電圧が印加されていない検出用の圧
電素子の電極間から、前記被検出荷重に応じた検
出電圧を検出する検出手段とを有することを特徴
とする荷重検出器。[Scope of Claims] 1. A plurality of piezoelectric elements disposed in an overlapping manner, and a fixing means for holding and fixedly supporting the plurality of piezoelectric elements disposed in an overlapping manner between both ends thereof; Adjustment voltage applying means for applying an adjustment voltage between the electrodes of each of the displacement piezoelectric elements in the plurality of piezoelectric elements so that the displacement piezoelectric elements simultaneously expand and contract; a detection load applying means for applying a detection load between both ends so as to suppress the deviation; and a detection piezoelectric element to which an adjustment voltage is not applied by the adjustment voltage application means among the plurality of piezoelectric elements. A load detector comprising a detection means for detecting a detection voltage according to the load to be detected from between the electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2793381A JPS57142530A (en) | 1981-02-27 | 1981-02-27 | Load detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2793381A JPS57142530A (en) | 1981-02-27 | 1981-02-27 | Load detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57142530A JPS57142530A (en) | 1982-09-03 |
| JPS6222408B2 true JPS6222408B2 (en) | 1987-05-18 |
Family
ID=12234689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2793381A Granted JPS57142530A (en) | 1981-02-27 | 1981-02-27 | Load detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57142530A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998055843A2 (en) * | 1997-06-02 | 1998-12-10 | Nma Railway Signalling B.V. | A device for detecting mechanical forces |
| DE102015117203A1 (en) | 2015-10-08 | 2017-04-13 | Epcos Ag | pressure sensor |
-
1981
- 1981-02-27 JP JP2793381A patent/JPS57142530A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57142530A (en) | 1982-09-03 |
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