JPH04326300A - Driving circuit for piezoelectric speaker - Google Patents
Driving circuit for piezoelectric speakerInfo
- Publication number
- JPH04326300A JPH04326300A JP12489791A JP12489791A JPH04326300A JP H04326300 A JPH04326300 A JP H04326300A JP 12489791 A JP12489791 A JP 12489791A JP 12489791 A JP12489791 A JP 12489791A JP H04326300 A JPH04326300 A JP H04326300A
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric
- impedance
- coil
- piezoelectric element
- drive circuit
- 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.)
- Withdrawn
Links
- 238000010586 diagram Methods 0.000 description 5
- 230000005236 sound signal Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、圧電型スピーカの駆
動回路に関し、特に、周波数特性を平坦すること及び音
響信号の供給源であるステレオ装置などとのインピーダ
ンス整合をとることが可能な圧電型スピーカの駆動回路
に関する。[Field of Industrial Application] This invention relates to a drive circuit for a piezoelectric speaker, and in particular to a piezoelectric speaker drive circuit that is capable of flattening frequency characteristics and impedance matching with a stereo device that is a source of an acoustic signal. The present invention relates to a speaker drive circuit.
【０００２】0002
【従来の技術】従来の圧電型スピーカの駆動回路として
は、例えば、図３に示すような駆動回路が知られている
。この圧電型スピーカの駆動回路は、平坦な音圧−周波
数特性を得るために、特性の異なる圧電素子１１ａ，１
１ｂ，１１ｃを並列に接続した圧電素子群Ａと、同じく
特性の異なる圧電素子１２ａ，１２ｂ，１２ｃ，１２ｄ
を並列に接続した圧電素子群Ｂを並列に接続するととも
に、高周波域でのインピーダンスの低下を補償するとと
もに、一般家庭で普及しているステレオ装置などの音響
信号供給手段と直結することができるように、圧電素子
群Ａ，Ｂと直列に数十Ω程度の抵抗Ｒ１，Ｒ２を挿入し
ている。2. Description of the Related Art As a conventional piezoelectric speaker drive circuit, for example, a drive circuit as shown in FIG. 3 is known. This piezoelectric speaker drive circuit uses piezoelectric elements 11a and 1 with different characteristics in order to obtain flat sound pressure-frequency characteristics.
A piezoelectric element group A in which piezoelectric elements 1b and 11c are connected in parallel, and piezoelectric elements 12a, 12b, 12c, and 12d that also have different characteristics.
Piezoelectric element group B, which is connected in parallel, is connected in parallel to compensate for the drop in impedance in the high frequency range, and to be able to be directly connected to audio signal supply means such as stereo equipment that is popular in ordinary homes. Resistors R1 and R2 of approximately several tens of ohms are inserted in series with the piezoelectric element groups A and B.
【０００３】0003
【発明が解決しようとする課題】しかし、上記構成を有
する従来の圧電型スピーカの駆動回路では、図４に示す
ように、高周波域では抵抗Ｒ１，Ｒ２によりいくらかは
インピーダンスの低下が補償されるが、数十Ωの抵抗Ｒ
１，Ｒ２を直列に接続しただけでは、インピーダンスの
低下を十分に補償することができないという問題点があ
り、また、高周波域で圧電素子に印加される電圧が高く
、中周波域から高周波域にかけての音圧−周波数特性を
平坦にすることができず、十分に良好な音質を得ること
ができないという問題点がある。[Problems to be Solved by the Invention] However, in the conventional piezoelectric speaker drive circuit having the above configuration, as shown in FIG. , resistance R of several tens of Ω
1. There is a problem that simply connecting R2 in series cannot sufficiently compensate for the drop in impedance.In addition, the voltage applied to the piezoelectric element is high in the high frequency range, and the voltage applied to the piezoelectric element is high in the high frequency range. There is a problem in that the sound pressure-frequency characteristics of the sound pressure-frequency characteristics cannot be made flat, and sufficiently good sound quality cannot be obtained.
【０００４】また、上記従来の駆動回路では、不整合状
態でステレオ装置などの音響信号供給手段と接続される
ため、エネルギーの反射が生じ、効率のよい電力供給を
行うことができないという問題点がある。[0004] Furthermore, the conventional drive circuit described above has the problem that since it is connected to an audio signal supply means such as a stereo device in a mismatched state, energy is reflected and it is not possible to efficiently supply power. be.
【０００５】この発明は上記問題点を解決するものであ
り、中周波域から高周波域にかけて音圧−周波数特性を
平坦にすることが可能で、音響信号供給手段とインピー
ダンス整合のとれた状態で接続することが可能な圧電型
スピーカの駆動回路を提供することを目的とする。[0005] This invention solves the above-mentioned problems, and is capable of flattening the sound pressure-frequency characteristics from the medium frequency range to the high frequency range, and connects to the acoustic signal supply means with impedance matching. An object of the present invention is to provide a piezoelectric speaker drive circuit that can perform the following steps.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、この発明の圧電型スピーカの駆動回路は、圧電素子
を用いた圧電型スピーカの駆動回路であって、並列に接
続された２以上の圧電素子からなる圧電素子群と、該圧
電素子群と直列に接続されたコイルとを具備するととも
に、整合変成器を介して音響信号供給手段に接続される
ことを特徴とする。[Means for Solving the Problems] In order to achieve the above object, the piezoelectric speaker drive circuit of the present invention is a piezoelectric speaker drive circuit using piezoelectric elements, in which two or more piezoelectric speakers are connected in parallel. The apparatus is characterized in that it comprises a piezoelectric element group consisting of piezoelectric elements, and a coil connected in series with the piezoelectric element group, and is connected to an acoustic signal supply means via a matching transformer.
【０００７】[0007]
【作用】圧電素子群と直列にコイルが接続されているた
め、高周波域のインピーダンスの低下がコイルのインピ
ーダンスにより補償され、かつ、高周波域で圧電素子に
印加される電圧が低減されるため、中周波域から高周波
域にかけての音圧−周波数特性を平坦にすることが可能
になる。[Operation] Since the coil is connected in series with the piezoelectric element group, the drop in impedance in the high frequency range is compensated by the impedance of the coil, and the voltage applied to the piezoelectric element in the high frequency range is reduced. It becomes possible to flatten the sound pressure-frequency characteristics from the frequency range to the high frequency range.
【０００８】また、音響信号供給手段とは整合変成器を
介してインピーダンス整合がとれた状態で接続されるた
め、効率のよいエネルギー供給が可能になるとともに、
圧電素子にとって好ましくない直流成分が除去され、良
好な特性を得ることが可能になる。[0008] Furthermore, since the acoustic signal supply means is connected with impedance matching through the matching transformer, efficient energy supply is possible, and
Direct current components that are undesirable for the piezoelectric element are removed, making it possible to obtain good characteristics.
【０００９】[0009]
【実施例】以下、この発明の実施例を図に基づいて説明
する。図１はこの発明の一実施例にかかる圧電型スピー
カの駆動回路を示す図である。この駆動回路においては
、圧電材料（基板）に電極を設けることにより形成した
、特性の異なる３つの高インピーダンスの圧電素子１ａ
，１ｂ，１ｃを並列に接続することにより、圧電素子群
（スピーカ部）Ｓが形成されている。そして、この圧電
素子群（スピーカ部）Ｓには、コイルＬが直列に接続さ
れており、さらに、整合変成器２を介してステレオ装置
のアンプなどの音響信号供給手段３に接続されている。
なお、この整合変成器２の１次側と２次側のインピーダ
ンス比は、例えば、８Ω（１次側）：２００〜３００Ω
（２次側）程度になるように構成されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a piezoelectric speaker drive circuit according to an embodiment of the present invention. In this drive circuit, three high impedance piezoelectric elements 1a with different characteristics are formed by providing electrodes on a piezoelectric material (substrate).
, 1b, and 1c are connected in parallel to form a piezoelectric element group (speaker section) S. A coil L is connected in series to this piezoelectric element group (speaker section) S, and is further connected via a matching transformer 2 to an acoustic signal supply means 3 such as an amplifier of a stereo device. Note that the impedance ratio between the primary side and the secondary side of this matching transformer 2 is, for example, 8Ω (primary side): 200 to 300Ω.
(secondary side).
【００１０】上記のように構成された圧電型スピーカの
駆動回路の、インピーダンスと周波数特性との関係を図
２に示す。なお、図２には、圧電素子のみの特性、コイ
ルのみの特性及び圧電素子とコイルとを組合せた場合（
すなわち、上記実施例の駆動回路）の特性を示している
。図２に示すように、圧電素子のみの場合には、高周波
域でのインピーダンスの低下が著しいが、コイルのイン
ピーダンスは高周波域で増大するため、両者を直列に接
続した上記実施例の駆動回路においては、高周波域のイ
ンピーダンスの低下がコイルのインピーダンスにより効
果的に補償されていることがわかる。また、高周波域で
は圧電素子に印加される電圧を減少させることができる
ため、上記の高周波域でのインピーダンスの補償効果と
もあいまって、中域から高域にかけての音圧−周波数特
性を平坦にすることができる。FIG. 2 shows the relationship between impedance and frequency characteristics of the piezoelectric speaker drive circuit configured as described above. Note that FIG. 2 shows the characteristics of only the piezoelectric element, the characteristics of only the coil, and the case of combining the piezoelectric element and coil (
That is, it shows the characteristics of the drive circuit of the above embodiment. As shown in FIG. 2, in the case of only a piezoelectric element, the impedance decreases significantly in the high frequency range, but since the impedance of the coil increases in the high frequency range, the drive circuit of the above embodiment in which both are connected in series It can be seen that the decrease in impedance in the high frequency range is effectively compensated for by the impedance of the coil. In addition, since the voltage applied to the piezoelectric element can be reduced in the high frequency range, this, combined with the impedance compensation effect in the high frequency range mentioned above, flattens the sound pressure-frequency characteristics from the mid to high range. be able to.
【００１１】また、上記実施例の駆動回路は、整合変成
器を介してステレオ装置のアンプなどの音響信号供給手
段と接続されるため、インピーダンスの不整合が生じず
、圧電型スピーカを効率よく駆動させることができる。Furthermore, since the drive circuit of the above embodiment is connected to an audio signal supply means such as an amplifier of a stereo device via a matching transformer, no impedance mismatch occurs and the piezoelectric speaker can be driven efficiently. can be done.
【００１２】なお、上記実施例においては、３つの圧電
素子を用い、これを並列に接続した場合について説明し
ているが、圧電素子の数については、良好な周波数特性
を有する圧電型スピーカを得ようとすると、２以上であ
ることが好ましいが、それ以上であれば特に制約される
ものではない。[0012] In the above embodiment, three piezoelectric elements are used and are connected in parallel. In this case, it is preferable that the number is 2 or more, but there is no particular restriction as long as it is more than 2.
【００１３】また、この発明の圧電型スピーカの駆動回
路は、整合変成器を備えていることから、高域，中域，
低域の各帯域専用の圧電型スピーカを形成することが可
能であり、また、例えば、周波数可変の超音波発生器な
どにも応用することが可能である。[0013] Furthermore, since the piezoelectric speaker drive circuit of the present invention is equipped with a matching transformer, high range, middle range,
It is possible to form a piezoelectric speaker dedicated to each low frequency band, and it is also possible to apply it to, for example, a frequency variable ultrasonic generator.
【００１４】[0014]
【発明の効果】上述のように、この発明の圧電型スピー
カの駆動回路は、圧電素子と直列にコイルを接続すると
ともに、整合変成器を介して音響信号供給手段と接続す
るようにしているので、中域から高域にかけての音圧−
周波数特性を平坦にして、圧電型スピーカの音質を向上
させることができる。また、整合状態で音響信号供給手
段と接続することができるため、圧電型スピーカを効率
よく駆動させることができる。[Effects of the Invention] As described above, the piezoelectric speaker drive circuit of the present invention connects the coil in series with the piezoelectric element and connects it to the acoustic signal supply means via the matching transformer. , sound pressure from midrange to high range -
It is possible to flatten the frequency characteristics and improve the sound quality of the piezoelectric speaker. Furthermore, since it can be connected to the acoustic signal supply means in a matched state, the piezoelectric speaker can be driven efficiently.
【図１】この発明の一実施例にかかる圧電型スピーカの
駆動回路を示す図である。FIG. 1 is a diagram showing a piezoelectric speaker drive circuit according to an embodiment of the present invention.
【図２】この発明の一実施例にかかる圧電型スピーカの
駆動回路のインピーダンス−周波数特性を示す線図であ
る。FIG. 2 is a diagram showing impedance-frequency characteristics of a drive circuit for a piezoelectric speaker according to an embodiment of the present invention.
【図３】従来の圧電型スピーカの駆動回路を示す図であ
る。FIG. 3 is a diagram showing a conventional piezoelectric speaker drive circuit.
【図４】従来の圧電型スピーカの駆動回路のインピーダ
ンス−周波数特性を示す線図である。FIG. 4 is a diagram showing impedance-frequency characteristics of a conventional piezoelectric speaker drive circuit.
１ａ，１ｂ，１ｃ 圧電素子 1a, 1b, 1c Piezoelectric element
Claims (1)
動回路であって、並列に接続された２以上の圧電素子か
らなる圧電素子群と、該圧電素子群と直列に接続された
コイルとを具備するとともに、整合変成器を介して音響
信号供給手段に接続されることを特徴とする圧電型スピ
ーカの駆動回路。1. A drive circuit for a piezoelectric speaker using piezoelectric elements, comprising a piezoelectric element group consisting of two or more piezoelectric elements connected in parallel, and a coil connected in series with the piezoelectric element group. What is claimed is: 1. A drive circuit for a piezoelectric speaker, comprising: a drive circuit for a piezoelectric speaker, and connected to an acoustic signal supply means via a matching transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12489791A JPH04326300A (en) | 1991-04-25 | 1991-04-25 | Driving circuit for piezoelectric speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12489791A JPH04326300A (en) | 1991-04-25 | 1991-04-25 | Driving circuit for piezoelectric speaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04326300A true JPH04326300A (en) | 1992-11-16 |
Family
ID=14896814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12489791A Withdrawn JPH04326300A (en) | 1991-04-25 | 1991-04-25 | Driving circuit for piezoelectric speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04326300A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005086528A1 (en) * | 2004-03-04 | 2005-09-15 | Mirae Plasma Co., Ltd. | Method of manufacturing film-speaker using piezoelectric film and sound equipment with the same |
| JP2007096439A (en) * | 2005-09-27 | 2007-04-12 | Kawai Musical Instr Mfg Co Ltd | Diaphragm driver and music sound generator |
| JP2015033109A (en) * | 2013-08-07 | 2015-02-16 | 新治 青野 | Piezoelectric drive speaker |
-
1991
- 1991-04-25 JP JP12489791A patent/JPH04326300A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005086528A1 (en) * | 2004-03-04 | 2005-09-15 | Mirae Plasma Co., Ltd. | Method of manufacturing film-speaker using piezoelectric film and sound equipment with the same |
| JP2007096439A (en) * | 2005-09-27 | 2007-04-12 | Kawai Musical Instr Mfg Co Ltd | Diaphragm driver and music sound generator |
| JP2015033109A (en) * | 2013-08-07 | 2015-02-16 | 新治 青野 | Piezoelectric drive speaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980711 |