JPH07245970A - Piezoelectric power generator - Google Patents
Piezoelectric power generatorInfo
- Publication number
- JPH07245970A JPH07245970A JP6032373A JP3237394A JPH07245970A JP H07245970 A JPH07245970 A JP H07245970A JP 6032373 A JP6032373 A JP 6032373A JP 3237394 A JP3237394 A JP 3237394A JP H07245970 A JPH07245970 A JP H07245970A
- Authority
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- Japan
- Prior art keywords
- piezoelectric element
- piezoelectric
- tire
- vibrators
- frequency
- 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.)
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- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、圧電素子が外部振動を
受けて電気分極することにより、発電を行う圧電素子発
電装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric element power generation device that generates electric power when a piezoelectric element receives external vibration and is electrically polarized.
【０００２】[0002]
【従来の技術】従来、車両では、タイヤに内蔵されて空
気圧の異常を警報する装置（以下、「タイヤ空気圧検知
装置」と言う。）が実用化されている。このような装置
は保守作業の困難な箇所に搭載され、かつタイヤ外部の
電源から電力を供給することが難しい。さらに、万一の
空気漏れに備えて長期間に渡る動作が保証されなければ
ならない。2. Description of the Related Art Conventionally, in a vehicle, a device (hereinafter, referred to as "tire pressure detection device") incorporated in a tire to warn of an abnormality in air pressure has been put into practical use. Such a device is mounted in a place where maintenance work is difficult, and it is difficult to supply electric power from a power source outside the tire. In addition, long-term operation must be guaranteed in case of an air leak.
【０００３】したがって、このような装置の電源として
は、電池交換の不要な小型の発電装置が要望され、その
用途に適した電源として圧電素子発電装置が実用化され
ている（特開昭５９─１９４６７７号公報）。Therefore, as a power source for such a device, a small power generator which does not require battery replacement is demanded, and a piezoelectric element power generator has been put into practical use as a power source suitable for its use (Japanese Patent Laid-Open No. 59-59). 194677).
【０００４】図４は、従来の圧電素子発電装置の一例を
示す図である。図において、板状の圧電セラミック４１
の一端は基部４２に固定され、基部４２はタイヤの空気
室の内部に固定される。その圧電セラミック４１の他方
の自由端には錘り４３が固設され、圧電セラミック４１
の側面には対向電極４４が張り付けられる。なお、基部
４２には、錘り４３と空隙を空けて対峙する保護ガード
４５が一体に成形される。FIG. 4 is a diagram showing an example of a conventional piezoelectric element power generation device. In the figure, a plate-shaped piezoelectric ceramic 41
Is fixed to the base portion 42, and the base portion 42 is fixed inside the air chamber of the tire. A weight 43 is fixedly attached to the other free end of the piezoelectric ceramic 41.
A counter electrode 44 is attached to the side surface of the. The base 42 is integrally formed with a weight 43 and a protective guard 45 facing each other with a gap.
【０００５】このような圧電素子発電装置では、基部４
２を介して、車両走行時にタイヤの振動を受け、圧電セ
ラミック４１および錘り４３から構成される部材（以
下、「振動子」という。）が振動する。その際に、圧電
セラミック４１の側面は屈曲運動を繰り返し、圧電効果
により交流性の電荷が生じる。その電荷は、対向電極４
４から取り出され、整流その他の手段を介し、電力とし
て外部に提供される。In such a piezoelectric element power generator, the base 4
Via 2, the tire is vibrated when the vehicle is traveling, and a member (hereinafter, referred to as “vibrator”) composed of the piezoelectric ceramic 41 and the weight 43 vibrates. At that time, the side surface of the piezoelectric ceramic 41 repeats bending motion, and an alternating charge is generated by the piezoelectric effect. The charge is the counter electrode 4
4 and is supplied to the outside as electric power through rectification or other means.
【０００６】[0006]
【発明が解決しようとする課題】このように圧電素子発
電装置の発電量は、圧電セラミック４１の発生電荷量に
依存する。その発生電荷量は、図５に示すように振動子
の共振振動数をピークとする急峻な共振特性を示す。な
お、本図は、横軸に外部振動数を対数目盛で示し、縦軸
に発生電荷量を対数目盛で示す。また、その特性は、重
力加速度１Ｇの外部振動を与えた測定結果である。As described above, the power generation amount of the piezoelectric element power generation device depends on the generated charge amount of the piezoelectric ceramic 41. The generated charge amount shows a steep resonance characteristic having a peak at the resonance frequency of the vibrator as shown in FIG. In this figure, the horizontal axis shows the external frequency on a logarithmic scale, and the vertical axis shows the generated charge amount on a logarithmic scale. In addition, the characteristic is a measurement result when an external vibration of gravitational acceleration 1G is applied.
【０００７】このようにタイヤの振動数が共振振動数を
僅かに離れると、発生電荷量が激減する。例えば、振動
子の共振振動数 77.6 Ｈｚに対し、タイヤの振動数 60.
0 Ｈｚでは、発生電荷量はピーク時に比べて、−21.5ｄ
Ｂ程度も低くなる。When the frequency of the tire deviates slightly from the resonance frequency in this way, the amount of generated electric charges is drastically reduced. For example, the resonance frequency of the vibrator is 77.6 Hz, while the vibration frequency of the tire is 60.
At 0 Hz, the generated charge is -21.5d compared to the peak.
B is also reduced.
【０００８】一般に、タイヤの振動数は車速その他によ
って変動するため、タイヤに搭載された圧電素子発電装
置では、広範囲の車速に渡り、充分な電力量を得ること
が出来なかった。そのために、上述のタイヤ空気圧検知
装置では、回路規模を縮小して消費電流を制限し、装置
の機能または性能を抑えざるを得なかった。In general, the frequency of a tire fluctuates depending on the vehicle speed and the like. Therefore, the piezoelectric element power generator mounted on the tire cannot obtain a sufficient amount of electric power over a wide range of vehicle speeds. Therefore, in the above-described tire air pressure detection device, the circuit scale must be reduced to limit the current consumption, and the function or performance of the device must be suppressed.
【０００９】本発明では、外部振動数の変動によらず、
安定かつ充分な発電を行う圧電素子発電装置を提供する
ことを目的とする。In the present invention, regardless of the fluctuation of the external frequency,
An object of the present invention is to provide a piezoelectric element power generation device that stably and sufficiently generates power.
【００１０】[0010]
【課題を解決するための手段】請求項１に記載の発明
は、圧電材料を梁状に形成した圧電素子と、その圧電素
子の一端が固着され、かつ外部振動を受ける基部と、上
記の圧電素子の振動する自由端に固設される荷重部材
と、上記の圧電素子の屈曲する側面に対向して張付けら
れる対向電極とを個別に有し、かつ上記の外部振動の周
波数帯域に相異なる共振振動数を有する複数の振動子
と、その振動子の各々の対向電極の間に生じた電力を合
成する合成手段とを備えたことを特徴とする。According to a first aspect of the present invention, there is provided a piezoelectric element having a beam-shaped piezoelectric material, a base to which one end of the piezoelectric element is fixed, and which receives external vibration, and the piezoelectric element. Resonance different from each other in the frequency band of the external vibration, which has a load member fixed to the vibrating free end of the element and a counter electrode that is attached to face the curved side surface of the piezoelectric element. It is characterized in that it is provided with a plurality of vibrators having a frequency and a synthesizing means for synthesizing the electric power generated between the opposed electrodes of the respective oscillators.
【００１１】請求項２に記載の発明は、圧電材料を梁状
に形成した圧電素子と、その圧電素子の一端が固着さ
れ、且つタイヤに搭載されて外部振動を受ける基部と、
上記の圧電素子の振動する自由端に固設される荷重部材
と、上記の圧電素子の屈曲する側面に対向して張付けら
れる対向電極とを個別に有し、かつタイヤに生じる捩じ
り振動の周波数帯域に相異なる共振振動数を有する複数
の振動子と、その振動子の各々の対向電極に生じた電荷
を整流し、並列に蓄電する合成手段とを備えたことを特
徴とする。According to a second aspect of the present invention, there is provided a piezoelectric element in which a piezoelectric material is formed into a beam shape, and one end of the piezoelectric element is fixed, and the base is mounted on a tire and receives external vibration.
The load member fixed to the vibrating free end of the piezoelectric element, and the counter electrode separately attached to face the curved side surface of the piezoelectric element are separately provided, and the torsional vibration of the tire It is characterized by comprising a plurality of vibrators having different resonance frequencies in the frequency band, and a synthesizing means for rectifying the charges generated in the counter electrodes of the vibrators and storing them in parallel.
【００１２】[0012]
【作用】請求項１に記載の発明にかかわる圧電素子発電
装置では、振動子が複数備えられ、それらは外部振動数
の変動しうる帯域に各々異なる共振振動数を有する。そ
の各々の振動子に発生する電荷を対向電極によって取り
出し、合成手段によって電力として合成する。In the piezoelectric element power generation device according to the first aspect of the present invention, a plurality of vibrators are provided, each of which has a different resonance frequency in a band where the external frequency can fluctuate. The electric charges generated in each of the vibrators are taken out by the counter electrode and combined by the combining means as electric power.
【００１３】このように、複数の共振特性を合成した発
電量となるので、外部振動数の帯域に渡って、確実に安
定した発電量が得られる。請求項２に記載の発明にかか
わる圧電素子発電装置では、タイヤに配置された基部は
タイヤの振動を種々に受ける。特に、４０〜６０〔Ｈ
ｚ〕の振動数は、タイヤの振動数の内で安定した捩じり
振動に相当する。この帯域において相異なる共振振動数
を有する振動子を複数備えて、捩じり振動を確実にとら
える。その各々に発生する電荷を対向電極から取り出
し、合成手段で整流し、並列に蓄える。As described above, since the power generation amount is a combination of a plurality of resonance characteristics, it is possible to reliably obtain a stable power generation amount over the external frequency band. In the piezoelectric element power generation device according to the second aspect of the invention, the base portion arranged on the tire receives various vibrations of the tire. In particular, 40-60 [H
The frequency z] corresponds to a stable torsional vibration within the frequency of the tire. A plurality of oscillators having different resonance frequencies in this band are provided to reliably catch torsional vibration. The electric charge generated in each of them is taken out from the counter electrode, rectified by the synthesizing means, and stored in parallel.
【００１４】このように、複数の振動子が、タイヤに安
定して生じる捩じり振動を確実にとらえて振動し、安定
した発電を行うことができる。As described above, the plurality of vibrators can vibrate by reliably grasping the torsional vibrations that occur in the tire in a stable manner to generate stable power generation.
【００１５】[0015]
【実施例】以下、図面に基づいて本発明の実施例につい
て詳細に説明する。図１は、請求項１および請求項２に
記載の発明に対応した実施例を示す図である。Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a diagram showing an embodiment corresponding to the invention described in claims 1 and 2.
【００１６】図において、振動子１１ａ〜１１ｃは、ダ
イオードブリッジ１２ａ〜１２ｃの交流入力端子にそれ
ぞれ接続される。これらのダイオードブリッジ１２ａ〜
１２ｃの正極端子は、何れもコンデンサ１３と、ツェナ
ダイオード１４との並列接続を介して接地されると共
に、タイマ回路１５の電源端子とトランジスタスイッチ
１６のコレクタとに接続される。タイマ回路１５の出力
端子はトランジスタスイッチ１６のベースに接続され、
トランジスタスイッチ１６のエミッタは３端子レギュレ
ータ１７の入力端子に接続される。３端子レギュレータ
１７の出力端子はタイヤ空気圧検知装置１８の電源端子
に接続される。また、ダイオードブリッジ１２ａ〜１２
ｃの負極端子、タイマ回路１５の接地端子、３端子レギ
ュレータ１７の接地端子およびタイヤ空気圧検知装置の
接地端子は、何れも接地される。In the figure, the vibrators 11a to 11c are connected to the AC input terminals of the diode bridges 12a to 12c, respectively. These diode bridges 12a-
The positive terminal of 12c is grounded via a parallel connection between the capacitor 13 and the Zener diode 14, and is connected to the power supply terminal of the timer circuit 15 and the collector of the transistor switch 16. The output terminal of the timer circuit 15 is connected to the base of the transistor switch 16,
The emitter of the transistor switch 16 is connected to the input terminal of the 3-terminal regulator 17. The output terminal of the three-terminal regulator 17 is connected to the power supply terminal of the tire air pressure detection device 18. Also, the diode bridges 12a-12
The negative terminal of c, the ground terminal of the timer circuit 15, the ground terminal of the three-terminal regulator 17, and the ground terminal of the tire pressure detecting device are all grounded.
【００１７】図２は、振動子１１ａ〜１１ｃの構造を示
す図である。図において、圧電素子としての圧電セラミ
ック２１ａ〜２１ｃは、互いに長さの異なる板状を呈
し、その一端をそれぞれ基部２２に固定される。圧電セ
ラミック２１ａ〜２１ｃの他方の自由端には、荷重部材
として錘り２３ａ〜２３ｃがそれぞれ接着される。圧電
セラミック２１ａ〜２１ｃの側面には、それぞれ対向電
極２４ａ〜２４ｃがスパッタリングによって形成されて
いる。なお、圧電セラミック２１ａ〜２１ｃの側面をタ
イヤの円周方向に垂直に向けて、基部２２がタイヤ空気
室の内側のリム部に固定される。また、基部２２には、
錘り２３ａ〜２３ｃと空隙をそれぞれ空けて挟む保護ガ
ード２５が一体に形成される。FIG. 2 is a diagram showing the structure of the vibrators 11a to 11c. In the figure, the piezoelectric ceramics 21a to 21c as piezoelectric elements are plate-shaped and have different lengths from each other, and one ends thereof are fixed to the base portion 22, respectively. Weights 23a to 23c are bonded to the other free ends of the piezoelectric ceramics 21a to 21c as load members, respectively. Opposite electrodes 24a to 24c are formed on the side surfaces of the piezoelectric ceramics 21a to 21c by sputtering. The base portion 22 is fixed to the rim portion inside the tire air chamber with the side surfaces of the piezoelectric ceramics 21a to 21c oriented vertically in the circumferential direction of the tire. In addition, the base 22 has
The weights 23a to 23c are integrally formed with a protective guard 25 that sandwiches a gap.
【００１８】なお、本実施例と本発明との対応は、圧電
セラミック２１ａ〜２１ｃは圧電素子に対応し、基部２
２は基部に対応し、錘り２３ａ〜２３ｃは荷重部材に対
応し、対向電極２４ａ〜２４ｃは対向電極に対応し、振
動子１１ａ〜１１ｃは振動子に対応し、ダイオードブリ
ッジ１２ａ〜１２ｃおよびコンデンサ１３は合成手段に
対応する。The correspondence between the present embodiment and the present invention is that the piezoelectric ceramics 21a to 21c correspond to piezoelectric elements, and the base 2
2 corresponds to a base portion, weights 23a to 23c correspond to load members, counter electrodes 24a to 24c correspond to counter electrodes, vibrators 11a to 11c correspond to vibrators, diode bridges 12a to 12c and capacitors. Reference numeral 13 corresponds to a synthesizing means.
【００１９】以下、図１および図２に基づいて動作を説
明する。走行時のタイヤには、主として４０〜６０Ｈｚ
の捩じり振動が生じる。その捩じり振動は、基部２２を
介して、振動子１１ａ〜１１ｃを強制振動させる。その
結果、圧電セラミック２１ａ〜２１ｃが屈曲を繰り返
し、対向電極２４ａ〜２４ｃに電荷が生じる。その電荷
量の特性は、振動子１１ａ〜１１ｃの長さを変えること
により、図３に示すような共振振動数４０Ｈｚ、５０Ｈ
ｚ、６０Ｈｚをピークとする共振特性となる。なお、本
図の横軸は外部振動数を示し、縦軸は圧電セラミック２
１ａ〜２１ｃの発生電荷量を示す。The operation will be described below with reference to FIGS. 1 and 2. 40-60 Hz is mainly used for running tires.
Torsional vibration occurs. The torsional vibrations force the vibrators 11a to 11c to vibrate through the base portion 22. As a result, the piezoelectric ceramics 21a to 21c are repeatedly bent, and charges are generated in the counter electrodes 24a to 24c. The characteristic of the charge amount is that resonance frequencies 40 Hz and 50 H as shown in FIG. 3 are obtained by changing the lengths of the vibrators 11a to 11c.
The resonance characteristic has peaks at z and 60 Hz. The horizontal axis of this figure shows the external frequency and the vertical axis of the piezoelectric ceramic 2
The generated charge amount of 1a to 21c is shown.
【００２０】対向電極２４ａ〜２４ｃから取り出された
電荷の流れは、ダイオードブリッジ１２ａ〜１２ｃで各
々整流され、コンデンサ１３に並列に充電される。この
ように、複数の共振特性を有する振動子１１ａ〜１１ｃ
により、捩じり振動を確実にとらえ、安定して発電する
ことができる。また、発電される電力量は、合成するこ
とにより、単一の振動子と比較して大きくなる。The flow of charges taken out from the counter electrodes 24a to 24c is rectified by the diode bridges 12a to 12c and charged in parallel to the capacitor 13. Thus, the vibrators 11a to 11c having a plurality of resonance characteristics
As a result, the torsional vibration can be reliably captured, and stable power generation can be achieved. In addition, the amount of electric power generated is larger than that of a single vibrator by combining them.
【００２１】なお、ツェナダイオード１４はコンデンサ
１３が絶対定格を超過することを防いでいる。また、タ
イマ回路１５は、３０秒に一度の間隔でトランジスタス
イッチ１６を 0.5秒間だけ導通させて、タイヤ空気圧検
知装置１８を間欠的に駆動する。３端子レギュレータ１
７は、電圧を安定化することにより、一定電圧をタイヤ
空気圧検知回路に供給している。The Zener diode 14 prevents the capacitor 13 from exceeding the absolute rating. Further, the timer circuit 15 turns on the transistor switch 16 for 0.5 seconds at intervals of 30 seconds to intermittently drive the tire air pressure detection device 18. 3-terminal regulator 1
7 stabilizes the voltage to supply a constant voltage to the tire air pressure detection circuit.
【００２２】さらに、本実施例では、コンデンサ１３の
容量を従来の３３μＦから、例えば３３００μＦ程度に
大きくした。したがって、充電される電荷量が増して
も、コンデンサ１３の充電電圧は低くなるので、絶対定
格の低い小型のコンデンサを用いて装置の小型化を図る
ことができた。また、より大きな電流を安定して取り出
せるようになった。Further, in the present embodiment, the capacitance of the capacitor 13 is increased from the conventional 33 μF to, for example, about 3300 μF. Therefore, even if the amount of charge to be charged increases, the charging voltage of the capacitor 13 decreases, so that the device can be downsized by using a small capacitor having a low absolute rating. Also, a larger current can be stably taken out.
【００２３】なお、本実施例では、電荷の流れを整流し
た後で電荷を蓄えているが、電力の合成手段としては、
対向電極２４ａ〜２４ｃを直列または並列に接続して合
成してもよい。In this embodiment, the electric charge is stored after the flow of the electric charge is rectified.
The counter electrodes 24a to 24c may be connected in series or in parallel to be combined.
【００２４】また、本実施例では、圧電素子として圧電
セラミックを用いているが、圧電効果を有し、かつ梁状
に加工できる圧電材料であれば使用できる。さらに、本
実施例では、振動子の長さを変えて、所望の共振振動数
を得ているが、振動子の曲げ剛性や錘りの質量を変える
ことにより、共振振動数を可変しても良い。In this embodiment, the piezoelectric ceramic is used as the piezoelectric element, but any piezoelectric material having a piezoelectric effect and capable of being processed into a beam shape can be used. Furthermore, in the present embodiment, the desired resonance frequency is obtained by changing the length of the vibrator, but the resonance frequency can be changed by changing the bending rigidity of the vibrator and the mass of the weight. good.
【００２５】なお、本実施例では、各振動子が一体に固
設されているが、各振動子の基部を個別にしても良く、
それらを離して配置したり、別方向を向けて配置するこ
とにより、多様な外部振動を受けられるようにしても良
い。In the present embodiment, the vibrators are integrally fixed, but the bases of the vibrators may be separate,
Various external vibrations may be received by arranging them separately or by arranging them in different directions.
【００２６】[0026]
【発明の効果】以上説明したように、本発明は、外部振
動数の広範囲の変動に渡り、安定して電力を発生し、且
つ発電される電力量は大きくなる。As described above, according to the present invention, electric power is stably generated and the amount of electric power generated is increased over a wide range of fluctuations of the external frequency.
【００２７】また、請求項２に記載の発明は、タイヤに
安定して生じる捩じり振動数を確実にとらえ、安定した
電力を発生することができる。その結果、タイヤに搭載
される電源に適した発電装置となる。Further, in the invention according to the second aspect, it is possible to surely grasp the torsional frequency which is stably generated in the tire and to generate a stable electric power. As a result, the power generator suitable for the power source mounted on the tire is obtained.
【００２８】したがって、本発明を電源に適用した装置
は安定して駆動され、その機能および性能を高められ
る。Therefore, the device to which the present invention is applied as a power source can be stably driven and its function and performance can be enhanced.
【図１】請求項１および請求項２に記載の発明に対応し
た実施例を示す図である。FIG. 1 is a diagram showing an embodiment corresponding to the invention described in claims 1 and 2. FIG.
【図２】振動子１１ａ〜１１ｃの構造を示す図である。FIG. 2 is a diagram showing a structure of vibrators 11a to 11c.
【図３】振動数と発生電荷量との関係を示す図である。FIG. 3 is a diagram showing a relationship between a frequency and a generated charge amount.
【図４】従来の圧電素子発電装置の一例を示す図であ
る。FIG. 4 is a diagram showing an example of a conventional piezoelectric element power generation device.
【図５】従来例における振動数と発生電荷量との関係を
示す図である。FIG. 5 is a diagram showing a relationship between a frequency and a generated charge amount in a conventional example.
１１ａ〜１１ｃ 振動子 １２ａ〜１２ｃ ダイオードブリッジ １３ コンデンサ １４ ツェナダイオード １５ タイマ回路 １６ トランジスタスイッチ １７ ３端子レギュレータ １８ タイヤ空気圧検知装置 ２１ａ〜２１ｃ、４１ 圧電セラミック ２２、４２ 基部 ２３ａ〜２３ｃ、４３ 錘り ２４ａ〜２４ｃ、４４ 対向電極 11a-11c Oscillator 12a-12c Diode bridge 13 Capacitor 14 Zener diode 15 Timer circuit 16 Transistor switch 17 3 terminal regulator 18 Tire air pressure detection device 21a-21c, 41 Piezoelectric ceramic 22, 42 Base 23a-23c, 43 Weight 24a- 24c, 44 counter electrode
Claims (2)
基部と、 前記圧電素子の振動する自由端に固設される荷重部材
と、 前記圧電素子の屈曲する側面に対向して張付けられる対
向電極とを個別に有し、且つ前記外部振動の周波数帯域
に相異なる共振振動数を有する複数の振動子と、 前記振動子毎の前記対向電極の間に生じた電力を合成す
る合成手段とを備えたことを特徴とする圧電素子発電装
置。1. A piezoelectric element in which a piezoelectric material is formed into a beam shape, a base portion to which one end of the piezoelectric element is fixed and which receives external vibration, and a load member fixed to a free end of the piezoelectric element where the piezoelectric element vibrates. A plurality of vibrators each having a counter electrode attached to face the bent side surface of the piezoelectric element, and having different resonance frequencies in the frequency band of the external vibration; A piezoelectric element power generation device comprising: a synthesizing unit that synthesizes electric power generated between opposing electrodes.
て外部振動を受ける基部と、 前記圧電素子の振動する自由端に固設される荷重部材
と、 前記圧電素子の屈曲する側面に対向して張付けられる対
向電極と、 を個別に有し、且つタイヤに生じる捩じり振動の周波数
帯域に相異なる共振振動数を有する複数の振動子と、 前記振動子毎の前記対向電極に生じた電荷を整流し、並
列に蓄電する合成手段とを備えたことを特徴とする圧電
素子発電装置。2. A piezoelectric element having a piezoelectric material formed in a beam shape, a base to which one end of the piezoelectric element is fixed, and which is mounted on a tire to receive external vibration, and fixed to a vibrating free end of the piezoelectric element. A load member and a counter electrode that is attached to face the bent side surface of the piezoelectric element, and a plurality of resonance frequencies different from each other in the frequency band of the torsional vibration generated in the tire. A piezoelectric element power generation device comprising: a vibrator; and a synthesizing unit that rectifies charges generated in the counter electrode of each vibrator and stores the charges in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6032373A JPH07245970A (en) | 1994-03-02 | 1994-03-02 | Piezoelectric power generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6032373A JPH07245970A (en) | 1994-03-02 | 1994-03-02 | Piezoelectric power generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07245970A true JPH07245970A (en) | 1995-09-19 |
Family
ID=12357150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6032373A Pending JPH07245970A (en) | 1994-03-02 | 1994-03-02 | Piezoelectric power generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07245970A (en) |
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