JPH0241681A - Driving gear of piezoelectric actuator - Google Patents
Driving gear of piezoelectric actuatorInfo
- Publication number
- JPH0241681A JPH0241681A JP63189597A JP18959788A JPH0241681A JP H0241681 A JPH0241681 A JP H0241681A JP 63189597 A JP63189597 A JP 63189597A JP 18959788 A JP18959788 A JP 18959788A JP H0241681 A JPH0241681 A JP H0241681A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- piezoelectric actuator
- high frequency
- gate
- signal
- 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
- 230000005284 excitation Effects 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はプリンタヘッドを圧電素子で駆動するようにし
た圧電アクチュエータ駆動装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a piezoelectric actuator drive device that drives a printer head using a piezoelectric element.
（従来技術）
従来の此の種の圧電アクチュエータ駆動装置は例えば第
３図に示される回路で駆動される（特開昭５９−１９８
８８５号公報参照）。第３図において、１は駆動信号入
力端子、２，４．．６はトランジスタ、３，１２は抵抗
、１．１．１３はダイオード、７はコイル、８は圧電素
子、９は励振機構、１０はインバータを示し、駆動信号
入力端子１には第４図（ａｌに示すような一定の周期で
持続する例えば数に’Ｈｚの周波数の駆動信号が加えら
れこれによってトランジスタ２．４が導通し、又この駆
動信号はインバータ１０で反転されて同時にトランジス
タ６に加えられ、トランジスタ６は不導通になり、励振
電圧入力端子５からコイル７を介して圧電素子８に第４
図（ｂ）に示すような電流が流れ、圧電素子８には第４
図（Ｃ）に示すような電圧が加わり、圧電素子８が駆動
され、この圧電素子８に接続された励振機構９の拡大フ
レームの先端が第４図Ｆｄｌに示すように変位する。(Prior Art) A conventional piezoelectric actuator drive device of this type is driven by, for example, a circuit shown in FIG.
(See Publication No. 885). In FIG. 3, 1 is a drive signal input terminal, 2, 4 . ．． 6 is a transistor, 3 and 12 are resistors, 1, 1 and 13 are diodes, 7 is a coil, 8 is a piezoelectric element, 9 is an excitation mechanism, and 10 is an inverter. A drive signal having a frequency of, for example, 1000 Hz is applied to a constant periodic drive signal as shown in FIG. , the transistor 6 becomes non-conductive, and a fourth voltage is transmitted from the excitation voltage input terminal 5 to the piezoelectric element 8 via the coil 7.
A current as shown in Figure (b) flows, and the fourth piezoelectric element 8
A voltage as shown in FIG. 4C is applied to drive the piezoelectric element 8, and the tip of the enlarged frame of the excitation mechanism 9 connected to the piezoelectric element 8 is displaced as shown in FIG. 4Fdl.
又前記一定周期の後、トランジスタ２，４が不導通とな
り、ｌ・ランジスタロが導通ずるするので圧電素子８の
残留電荷はコイル７及び抵抗１２を介してトランジスタ
６からアースに放電される。Further, after the above-mentioned fixed period, the transistors 2 and 4 become non-conductive and the l.
この圧電素子８に対する充放電々流はコイル７のインダ
クタンス成分と圧電素子８のコンデンサー成分による直
列共振回路の共振電流となる。This charging/discharging current to the piezoelectric element 8 becomes a resonant current of a series resonant circuit formed by an inductance component of the coil 7 and a capacitor component of the piezoelectric element 8.
（発明が解決しようとする課題）
然しながら、励振機構９によって重い物体を駆動する場
合には、圧電素子８の蓄積電荷を増加しなければならず
、その結果、大きい重量の物体を駆動しようとする時は
コイル７に流れる電流を増加する必要がある。(Problem to be Solved by the Invention) However, when driving a heavy object using the excitation mechanism 9, it is necessary to increase the accumulated charge of the piezoelectric element 8, and as a result, it is difficult to drive a heavy object. In some cases, it is necessary to increase the current flowing through the coil 7.
コイルの立体容量は許容電流値を大きくすればするほど
大きくなる関係にあるから、コイル７に流れる電流を増
やすとコイルの立体容量が大きくなるという欠点がある
。Since the steric capacitance of the coil increases as the allowable current value increases, there is a drawback that increasing the current flowing through the coil 7 increases the steric capacitance of the coil.
本発明の目的は上記欠点を解消し、コイルの立体容量を
大きくすることなく、大きい重量の物体を駆動できるよ
うにした圧電アクチュエータ駆動装置を得るにある。SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a piezoelectric actuator drive device that can drive a heavy object without increasing the three-dimensional capacitance of the coil.
（課題を解決するための手段）
本発明は上記圧電素子８の充放電電流がコイル７のイン
ダクタンス成分と圧電素子８のコンデンサー成分による
直列共振回路の共振電流となる点に着目し、この共振電
流を充分に高い高周波電流とすることによってコイル７
のインダクタンス成分を減少せしめ、コイルの立体容量
を小さくするようにしたものである。(Means for Solving the Problems) The present invention focuses on the fact that the charging/discharging current of the piezoelectric element 8 becomes a resonant current of a series resonant circuit formed by the inductance component of the coil 7 and the capacitor component of the piezoelectric element 8, and this resonant current By making the high frequency current sufficiently high, the coil 7
This reduces the inductance component of the coil and reduces the steric capacitance of the coil.
本発明はスイッチとコイルとを介して圧電アクチュエー
タに励振電圧を駆動信号の周期に対応する期間印加する
ようにした圧電アクチュエータ駆動装置において、前記
駆動信号として高周波信号を用いたことを特徴とする。The present invention is a piezoelectric actuator drive device that applies an excitation voltage to a piezoelectric actuator for a period corresponding to the period of a drive signal via a switch and a coil, characterized in that a high frequency signal is used as the drive signal.
又本発明は更に、前記駆動信号が反転して印加され、導
通される他のスイッチを有し、このスイッチが前記コイ
ルと圧電アクチュエータの直列回路の両端に接続されて
いる事を特徴とする。Further, the present invention is further characterized in that the device further includes another switch which is turned on when the drive signal is applied in an inverted manner, and this switch is connected to both ends of the series circuit of the coil and the piezoelectric actuator.
（実 施 例） 以下図面によって本発明の詳細な説明する。(Example) The present invention will be explained in detail below with reference to the drawings.
本発明においては第１図に示すように前記第３図に示す
回路において前記トランジスタ２のへ一スに第１のＡＮ
Ｄゲート１４の出力端子を接続し、この第１のＡＮＤゲ
ート１４の２つの入力端子にそれぞれ例えば数ＫＨｚの
周波数の駆動信号と高周波発振器１５よりの例えば数百
ＫＨｚの高周波信号を加えるようにすると共に、前記ト
ランジスタ６のベースに第２のＡＮＤゲート１６の出力
端子を接続し、この第２のＡＮＤゲート１６の２つの入
力端子の一方に前記駆動信号をインバータ１７を介して
加え、他方に前記高周波発振器１５よりの高周波信号を
加えるようにする。In the present invention, as shown in FIG. 1, in the circuit shown in FIG.
The output terminal of the D gate 14 is connected, and a drive signal with a frequency of, for example, several KHz and a high frequency signal of, for example, several hundred KHz from the high frequency oscillator 15 are applied to the two input terminals of the first AND gate 14, respectively. At the same time, the output terminal of a second AND gate 16 is connected to the base of the transistor 6, the drive signal is applied to one of the two input terminals of the second AND gate 16 via an inverter 17, and the drive signal is applied to the other one of the two input terminals of the second AND gate 16. A high frequency signal from a high frequency oscillator 15 is added.
本発明圧電アクチュエータ駆動装置は上記のような構成
であるからトランジスタ２のベースには第２図（ａ）に
示すような高周波信号が第２図（ｂ）の駆動信号期間別
わり、コイル７と圧電素子８の直列回路には第２図ＦＣ
＋に示すような電圧が加わり、この結果第２図Ｆｄｌに
示すような充電々流が流れる。Since the piezoelectric actuator drive device of the present invention has the above-described configuration, a high frequency signal as shown in FIG. The series circuit of the piezoelectric element 8 is shown in FIG.
A voltage as shown in + is applied, and as a result, a charging current as shown in FIG. 2 Fdl flows.
従って圧電素子８の両端には第２図ｔｅｌに示すような
電圧が加わり、励振機構９の拡大フレームの先端変位は
第２図（ｆｌに示すようになる。Therefore, a voltage as shown in FIG. 2 (tel) is applied to both ends of the piezoelectric element 8, and the tip displacement of the enlarged frame of the excitation mechanism 9 becomes as shown in FIG. 2 (fl).
次に駆動信号が反転すると、トランジスタ２４は不導通
となり、１−ランジスタロのベースには高周波信号が加
わり、その結果第２図（ｄ）に示すような放電電流が流
れ、圧電素子８の電圧は第２図（Ｃ）に示すように低下
してゆき、励振機構９の拡大フレームの先端変位は第２
図（（）に示すようになる。Next, when the drive signal is reversed, the transistor 24 becomes non-conductive, and a high frequency signal is applied to the base of the 1-transistor. As a result, a discharge current as shown in FIG. 2(d) flows, and the voltage of the piezoelectric element 8 is As shown in FIG. 2(C), the tip displacement of the enlarged frame of the excitation mechanism 9 is at the second level.
It becomes as shown in the figure (().
（発明の効果）
本発明圧電アクチュエータ駆動装置によればコイル７の
インダクタンス成分を前記高周波信号の周波数に対応し
て小さくでき、従ってコイル７の立体容量を小さくする
ことができる大きな利益がある。更に、本発明による他
の効果として、放電時コイル７、抵抗１２を流れる放電
電流は、高周波信号がＯＮの期間復線的に増加するが、
０目の期間を短くしてゆく事により、放電時の最大電流
値を制限する事が可能になる。その結果抵抗１２を削除
、或いは耐電力値を下げ抵抗の大きさを小さくする事が
出来るという効果が得られる。(Effects of the Invention) According to the piezoelectric actuator drive device of the present invention, the inductance component of the coil 7 can be reduced in accordance with the frequency of the high-frequency signal, and therefore the steric capacitance of the coil 7 can be reduced, which is a great advantage. Furthermore, as another effect of the present invention, the discharge current flowing through the coil 7 and the resistor 12 during discharge increases linearly while the high frequency signal is ON;
By shortening the 0th period, it becomes possible to limit the maximum current value during discharge. As a result, it is possible to eliminate the resistor 12 or to reduce the resistance value by lowering the power resistance value.
第１図は本発明圧電アクチュエータ駆動装置を示す回路
図、第２図（ａｌ〜（ｆｌはその各部の波形図、第３図
は従来の圧電アクチュエータ駆動装置を示す回路図、第
４図（ａ＋〜（ｄｌはその各部の波形図である。
１・・・駆動信号入力端子、２． ４． ６・・・Ｉ・
ランジスタ、３．１２・・・抵抗、５・・・励振電圧入
力端子、７・・・コイル、８・・・圧電素子、９・・・
励振機構、１０・・・インバータ１１．１３・・・ダイ
オード、１４・・・第１のＡＮＤゲート、１５・・・高
周波発振器、１６・・・第２のＡＮＤゲート、１７・・
・インバータ。
第
図
（ｏ）
ｖ！１７屯号
（ｂ）
電
流
（Ｃ）
圧叡季手
監 ル
（ｄ）
鉱ナフレーム
近、璃多ズ立FIG. 1 is a circuit diagram showing a piezoelectric actuator drive device of the present invention, FIG. ~(dl is a waveform diagram of each part. 1... Drive signal input terminal, 2. 4. 6... I.
Ransistor, 3.12...Resistor, 5...Excitation voltage input terminal, 7...Coil, 8...Piezoelectric element, 9...
Excitation mechanism, 10... Inverter 11. 13... Diode, 14... First AND gate, 15... High frequency oscillator, 16... Second AND gate, 17...
・Inverter. Figure (o) v! 17th tun (b) Current (C) Pressure control (d) Near mine frame, Ritazudate
Claims (2)
に励振電圧を駆動信号の周期に対応する期間印加するよ
うにした圧電アクチュエータ駆動装置において、前記駆
動信号として高周波信号を用い前記コイルの容量を減少
できるようにしたことを特徴とする圧電アクチュエータ
駆動装置。1. In a piezoelectric actuator drive device in which an excitation voltage is applied to a piezoelectric actuator for a period corresponding to a period of a drive signal via a switch and a coil, a high frequency signal is used as the drive signal to reduce the capacitance of the coil. A piezoelectric actuator drive device characterized by:
スイッチを有し、このスイッチが前記コイルと圧電アク
チュエータの直列回路の両端に接続されていることを特
徴とする請求項１記載の圧電アクチュエータ駆動装置。2. 2. The piezoelectric actuator drive according to claim 1, further comprising another switch which is made conductive when the drive signal is applied in an inverted manner, and this switch is connected to both ends of the series circuit of the coil and the piezoelectric actuator. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63189597A JPH0241681A (en) | 1988-07-30 | 1988-07-30 | Driving gear of piezoelectric actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63189597A JPH0241681A (en) | 1988-07-30 | 1988-07-30 | Driving gear of piezoelectric actuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0241681A true JPH0241681A (en) | 1990-02-09 |
Family
ID=16243981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63189597A Pending JPH0241681A (en) | 1988-07-30 | 1988-07-30 | Driving gear of piezoelectric actuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0241681A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5126589A (en) * | 1990-08-31 | 1992-06-30 | Siemens Pacesetter, Inc. | Piezoelectric driver using resonant energy transfer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59198885A (en) * | 1983-04-25 | 1984-11-10 | Nec Corp | Piezoelectric actuator exciting system |
| JPS61221582A (en) * | 1985-03-26 | 1986-10-01 | Nec Corp | Supersonic wave linear motor drive system |
| JPS62135280A (en) * | 1985-12-08 | 1987-06-18 | Toshio Sashita | Drive power supply for ultrasonic motor |
-
1988
- 1988-07-30 JP JP63189597A patent/JPH0241681A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59198885A (en) * | 1983-04-25 | 1984-11-10 | Nec Corp | Piezoelectric actuator exciting system |
| JPS61221582A (en) * | 1985-03-26 | 1986-10-01 | Nec Corp | Supersonic wave linear motor drive system |
| JPS62135280A (en) * | 1985-12-08 | 1987-06-18 | Toshio Sashita | Drive power supply for ultrasonic motor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5126589A (en) * | 1990-08-31 | 1992-06-30 | Siemens Pacesetter, Inc. | Piezoelectric driver using resonant energy transfer |
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