JP2001339793A - Piezoelectric acoustic device - Google Patents
Piezoelectric acoustic deviceInfo
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- JP2001339793A JP2001339793A JP2000155605A JP2000155605A JP2001339793A JP 2001339793 A JP2001339793 A JP 2001339793A JP 2000155605 A JP2000155605 A JP 2000155605A JP 2000155605 A JP2000155605 A JP 2000155605A JP 2001339793 A JP2001339793 A JP 2001339793A
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- piezoelectric
- acoustic device
- peripheral
- piezoelectric element
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、圧電振動子を用い、音
を発する圧電音響装置に関し、特に音圧レベルが高い圧
電スピーカと呼ばれるタイプのものであって、音圧レベ
ル及び音質が向上し、ダイナミックタイプスピーカに匹
敵する高い音質が得られる圧電音響装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric acoustic device which emits sound using a piezoelectric vibrator, and more particularly to a piezoelectric speaker having a high sound pressure level, which has improved sound pressure level and sound quality. And a piezoelectric acoustic device capable of obtaining high sound quality comparable to a dynamic type speaker.
【０００２】[0002]
【従来の技術】従来における圧電音響装置は、円板状の
圧電セラミクス板の両面に電極を施してなる圧電素子を
金属円板からなる振動板に貼り付けた圧電振動子を使用
する。前記圧電素子の電極間に駆動電圧を印加し、この
駆動電圧方向と直交する方向の変位を径方向の伸縮とし
て取り出し、かつその伸縮により振動板に撓みを起こす
ことで圧電振動子を振動させることにより、音響的に有
効な振動を取り出す。2. Description of the Related Art A conventional piezoelectric acoustic device uses a piezoelectric vibrator in which a piezoelectric element formed by applying electrodes to both surfaces of a disk-shaped piezoelectric ceramic plate is attached to a diaphragm made of a metal disk. A drive voltage is applied between the electrodes of the piezoelectric element, a displacement in a direction perpendicular to the drive voltage direction is taken out as expansion and contraction in a radial direction, and the expansion and contraction causes the diaphragm to bend, thereby causing the piezoelectric vibrator to vibrate. Thereby, an acoustically effective vibration is extracted.
【０００３】一般的に発音体の音響インピーダンスＺａ
は発音体の密度ρとその音の伝達速度ｖ（音速）の積で
表される。発音体の振動は波として空気などの媒体を介
して我々の耳に到達する。この際、空気の音響インピー
ダンスＺａｉｒも上記の関係で表され、振動体からの振
動エネルギの受理が行われる訳である。従って振動エネ
ルギの伝達効率はＺａ＝Ｚａｉｒの状態の時に最大とな
る。In general, the acoustic impedance Za of a sounding body
Is represented by the product of the density ρ of the sounding body and the transmission speed v (sound speed) of the sound. The vibration of the sounding body reaches our ears as waves through a medium such as air. At this time, the acoustic impedance Zair of the air is also represented by the above relationship, and the vibration energy from the vibrating body is received. Therefore, the transmission efficiency of the vibration energy becomes maximum when Za = Zair.
【０００４】ところが、空気の音響インピーダンスＺａ
ｉｒは、およそ４００（Ｋｇ／ｍ2・ｓ）と低い値で表
される。それに対して圧電振動子のＺａは、４．３×１
０6（Ｋｇ/ｍ2・ｓ）と極めて高く、振動エネルギの伝
達が非効率的になるのが理解できる。一方、ダイナミッ
ク方式の発音体は振動板に樹脂や紙などを用いているこ
とから、Ｚａは圧電発音体に比較して低く、エネルギの
伝達効率が良くなる。However, air acoustic impedance Za
ir is represented by a low value of about 400 (Kg / m 2 · s). On the other hand, Za of the piezoelectric vibrator is 4.3 × 1
0 6 (Kg / m 2 · s), which is extremely high, and it can be understood that transmission of vibration energy becomes inefficient. On the other hand, since the dynamic sounding body uses resin, paper, or the like for the diaphragm, Za is lower than the piezoelectric sounding body, and the energy transmission efficiency is improved.
【０００５】[0005]
【発明が解決しようとしている課題】このような観点か
ら考慮すると、圧電振動子の振動エネルギの伝達効率を
向上させるためには、主として次のような手段が容易に
考えられる。 ・圧電振動子の密度を小さくする。 ・圧電振動子の弾性係数を小さくして音速を下げる。In view of the above, in order to improve the transmission efficiency of the vibration energy of the piezoelectric vibrator, the following means can be easily considered.・ Reduce the density of the piezoelectric vibrator. -Reduce the sound velocity by reducing the elastic modulus of the piezoelectric vibrator.
【０００６】しかしながら、圧電素子の主要部は焼成さ
れたセラミクス材料でり、これを貼り付けた振動板は金
属からなること等から、圧電振動子の密度を小さくした
り、圧電振動子の弾性係数を小さくするには自ずと限度
があり。このため従来において、この点の大幅な改善は
なされていなかったのが実状である。However, the main part of the piezoelectric element is made of a fired ceramic material, and the vibrating plate to which it is attached is made of metal. Therefore, the density of the piezoelectric vibrator can be reduced or the elastic coefficient of the piezoelectric vibrator can be reduced. There is naturally a limit to reducing. For this reason, in the prior art, no substantial improvement has been made in this respect.
【０００７】本発明は前記のような従来の圧電音響装置
における課題に鑑み、圧電素子の出す振動エネルギを、
その周囲にある部材を介して空気に効率よく伝達し、さ
らにこの空気を媒介として効率的に伝達することが出来
るようにし、これにより圧電音響装置の音質の向上を図
ることを目的とするものである。In view of the above-mentioned problems in the conventional piezoelectric acoustic device, the present invention reduces the vibration energy generated by the piezoelectric element.
The object is to efficiently transmit air to the air through members around the air, and to efficiently transmit the air as a medium, thereby improving the sound quality of the piezoelectric acoustic device. is there.
【０００８】[0008]
【課題を解決するための手段】本発明では、前記の目的
を達成するため、少なくとも一枚以上の圧電素子１２を
有し、この圧電素子１２の長さあるいは径方向の振動を
屈曲振動に変換する圧電振動子１を有する圧電音響装置
において、圧電振動子１の圧電素子１２からその周辺方
向に接続されていく部材の密度が次第に小さくなってい
くように圧電音響装置を構成した。According to the present invention, in order to achieve the above object, at least one or more piezoelectric elements 12 are provided, and vibration in the length or radial direction of the piezoelectric elements 12 is converted into bending vibration. In the piezoelectric acoustic device having the piezoelectric vibrator 1 described above, the piezoelectric acoustic device is configured such that the density of members connected from the piezoelectric element 12 of the piezoelectric vibrator 1 to the peripheral direction thereof gradually decreases.
【０００９】より具体的に述べると、本発明による圧電
音響装置は、振動板１１に圧電素子１２を貼り付けた圧
電振動子１の周辺部が周辺部材３で支持されたものであ
って、前記圧電振動子１の周辺部が支持部材２を介して
周辺部材３に支持されており、圧電素子１２、振動板１
１、支持部材２及び周辺部材３を構成する材質の密度
が、圧電素子１２、振動板１１、支持部材２及び周辺部
材３の順で大きいことを特徴とするものである。More specifically, in the piezoelectric acoustic device according to the present invention, a peripheral portion of a piezoelectric vibrator 1 in which a piezoelectric element 12 is adhered to a vibration plate 11 is supported by a peripheral member 3. The peripheral portion of the piezoelectric vibrator 1 is supported by the peripheral member 3 via the support member 2, and the piezoelectric element 12 and the diaphragm 1
1. The density of the material forming the support member 2 and the peripheral member 3 is larger in the order of the piezoelectric element 12, the diaphragm 11, the support member 2 and the peripheral member 3.
【００１０】より具体的な材料の組み合わせをあげれ
ば、例えば圧電素子１２の要部が圧電セラミクス、振動
板１１が金属板からなるとき、支持部材２は、樹脂、硬
質ゴムまたはカーボンの何れかであり、周辺部材３が発
泡樹脂または低密度カーボンからなる。More specifically, for example, when the main part of the piezoelectric element 12 is made of piezoelectric ceramics and the diaphragm 11 is made of a metal plate, the support member 2 is made of resin, hard rubber or carbon. The peripheral member 3 is made of a foamed resin or low-density carbon.
【００１１】圧電素子１２は基本的に何らかの部材で支
持されている。全ての物質が原則的に音響インピーダン
スを持つと考えると、圧電素子１２を支持する振動板１
１や支持部材２も同様に音響インピーダンスを持つ。さ
らにこの支持部材２を支持している周辺部材３も同様と
すると、振動は圧電素子１２、振動板１１、支持部材２
及び周辺部材３へと順次伝わっていく。The piezoelectric element 12 is basically supported by some member. Assuming that all substances have an acoustic impedance in principle, the diaphragm 1 supporting the piezoelectric element 12
1 and the supporting member 2 also have an acoustic impedance. If the same applies to the peripheral member 3 supporting the support member 2, the vibration is generated by the piezoelectric element 12, the diaphragm 11, and the support member 2.
And to the peripheral member 3.
【００１２】この場合おいて、振動を変位として考える
と、音響インピーダンスの特性上、低いインピーダンス
から高いインピーダンスヘの振動エネルギの伝達効率は
逆の場合よりも悪化する。従って、周辺部材３まで振動
エネルギを伝達しようとする場合、振動エネルギの発生
源である圧電素子１２から次第に音響インピーダンスを
低下させていくことが望ましい。こうすることで圧電素
子１２を含めて振動板１１、支持部材２及び周辺部材３
を効率的に振動することが出来る。また圧電素子１２か
ら周辺部材３に至る間の音響インピーダンスの低減に伴
い、周辺部材３の音響インピーダンスがその周囲の空気
に近くなるようにすると、周辺部材３が空気に効率的に
振動を伝えてくれるようになる。In this case, when the vibration is considered as a displacement, the transmission efficiency of the vibration energy from the low impedance to the high impedance is worse than that in the opposite case due to the characteristic of the acoustic impedance. Therefore, when the vibration energy is to be transmitted to the peripheral member 3, it is desirable to gradually reduce the acoustic impedance from the piezoelectric element 12, which is the source of the vibration energy. In this manner, the diaphragm 11, the support member 2, and the peripheral member 3 including the piezoelectric element 12 are provided.
Can be vibrated efficiently. Also, if the acoustic impedance of the peripheral member 3 is made closer to the surrounding air with the reduction of the acoustic impedance from the piezoelectric element 12 to the peripheral member 3, the peripheral member 3 efficiently transmits vibration to the air. Will be given.
【００１３】音響インピーダンスは上述のように、物質
の密度と音速の積で示される。音速ｃと密度ρの関係は
次の数１で表され、音響インピーダンスＺａは、数２の
通りとなる。よって音響インピーダンスをさげるために
は、圧電素子１２に比べて、その周囲の支持部材２や周
辺部材３の密度を小さくすればよいことになる。As described above, the acoustic impedance is represented by the product of the density of a substance and the speed of sound. The relationship between the sound speed c and the density ρ is expressed by the following equation 1, and the acoustic impedance Za is as shown in the following equation 2. Therefore, in order to lower the acoustic impedance, the density of the supporting member 2 and the peripheral member 3 around the piezoelectric element 12 may be reduced as compared with the piezoelectric element 12.
【００１４】[0014]
【数１】 (Equation 1)
【００１５】[0015]
【数２】 (Equation 2)
【００１６】[0016]
【発明の実施の形態】次に、図面を参照しながら、本発
明の実施の形態について、具体的且つ詳細に説明する。
図１は、本発明の一実施形態による圧電音響装置の基本
的な構成部材を示し、図２は同圧電音響装置における圧
電振動子の周辺部の支持構造を示す要部縦断側面図であ
る。この圧電音響装置は、圧電振動子と支持部材２と周
辺部材３とからなる。Embodiments of the present invention will now be described specifically and in detail with reference to the drawings.
FIG. 1 shows basic constituent members of a piezoelectric acoustic device according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional side view of a main part showing a supporting structure of a peripheral portion of a piezoelectric vibrator in the piezoelectric acoustic device. This piezoelectric acoustic device includes a piezoelectric vibrator, a support member 2 and a peripheral member 3.
【００１７】圧電振動子１は、円形フィルム状の圧電セ
ラミクスの両面をメタライズして電極とした圧電素子１
２と、金属円板からなる振動板１１とを有し、この振動
板１１に前記の圧電素子１２の片面の電極を導通状態で
貼り付けたものである。圧電素子１２は、厚さ方向に分
極されている。圧電セラミクスとしては、チタン酸ジル
コン酸鉛等が使用される。The piezoelectric vibrator 1 is a piezoelectric element 1 in which both surfaces of a circular film-shaped piezoelectric ceramic are metallized and used as electrodes.
2 and a vibrating plate 11 made of a metal disk, and an electrode on one side of the piezoelectric element 12 is adhered to the vibrating plate 11 in a conductive state. The piezoelectric element 12 is polarized in the thickness direction. As the piezoelectric ceramics, lead zirconate titanate or the like is used.
【００１８】この圧電素子１２を振動板１１の片主面に
貼り付けたものがユニモルフ型圧電振動子であり、圧電
素子１２を振動板１１の両主面に貼り付けたものがバイ
モルフ型圧電振動子である。図１と図２では、ユニモル
フ型圧電振動子を使用しているが、バイモルフ型圧電振
動子１を使用することもできる。The piezoelectric element 12 attached to one main surface of the vibration plate 11 is a unimorph type piezoelectric vibrator, and the piezoelectric element 12 attached to both main surfaces of the vibration plate 11 is a bimorph type piezoelectric vibrator. I am a child. 1 and 2, the unimorph type piezoelectric vibrator is used, but the bimorph type piezoelectric vibrator 1 can be used.
【００１９】支持部材２は、板状であって、且つリング
状のものであり、例えば、プラスチック、カーボン等の
成型品からなるものが好ましい。この支持部材２の内径
は、圧電振動子１の振動板１１の径より小さく、その外
径は、後述する周辺部材３の内径より大きい。周辺部材
３は、リング状の部材であって、発泡樹脂や低密度カー
ボン等の成形体からなる。この周辺部材３の内周には、
取付溝３３が形成されている。The support member 2 has a plate shape and a ring shape, and is preferably made of a molded product such as plastic or carbon. The inner diameter of the support member 2 is smaller than the diameter of the diaphragm 11 of the piezoelectric vibrator 1, and the outer diameter is larger than the inner diameter of a peripheral member 3 described later. The peripheral member 3 is a ring-shaped member and is formed of a molded body such as a foamed resin or low-density carbon. On the inner periphery of the peripheral member 3,
A mounting groove 33 is formed.
【００２０】このような構成部材を有する圧電音響装置
は、まず支持部材２の内周部の上に圧電振動子１の振動
板１１の外周部を載せ、シリコーン接着剤等の弾性接着
剤で接着する。さらに、このようにして圧電振動子１と
これを搭載した支持部材２を周辺部材３に挿入し、支持
部材２の外周部を周辺部材３の内周の取付溝３３に嵌め
込む。或いはこの逆に、支持部材２を周辺部材３の中に
挿入し、支持部材２の外周部を周辺部材３の内周の取付
溝３３に嵌め込んだ後、支持部材２の内周部に圧電振動
子１の振動板１１の外周部を接着してもよい。In the piezoelectric acoustic device having such components, the outer peripheral portion of the vibration plate 11 of the piezoelectric vibrator 1 is first mounted on the inner peripheral portion of the support member 2 and bonded with an elastic adhesive such as a silicone adhesive. I do. Further, the piezoelectric vibrator 1 and the supporting member 2 on which the piezoelectric vibrator 1 is mounted are inserted into the peripheral member 3, and the outer peripheral portion of the supporting member 2 is fitted into the inner peripheral mounting groove 33 of the peripheral member 3. Or, conversely, after inserting the support member 2 into the peripheral member 3 and fitting the outer peripheral portion of the support member 2 into the mounting groove 33 on the inner periphery of the peripheral member 3, the piezoelectric member is inserted into the inner peripheral portion of the support member 2. The outer peripheral portion of the diaphragm 11 of the vibrator 1 may be bonded.
【００２１】さらに周辺部材３は、適当な手段で緩衝作
用のある音響箱等の中に取り付けられる。周辺部材３を
支持する緩衝部材を図２において符号４で示した。この
ような圧電音響装置においては、圧電素子１２、振動板
１１、支持部材２及び周辺部材３の密度を、圧電素子１
２、振動板１１、支持部材２及び周辺部材３の順で小さ
くする。すなわち、圧電素子１２よりは振動板１１の密
度が、振動板１１よりは支持部材２の密度が、支持部材
２よりは周辺部材３の密度をそれぞれ小さくする。これ
ら圧電素子１２、振動板１１、支持部材２及び周辺部材
３の具体的な材料の選択の例を表１〜表４に示す。Further, the peripheral member 3 is mounted by a suitable means in an acoustic box or the like having a buffering action. The buffer member supporting the peripheral member 3 is indicated by reference numeral 4 in FIG. In such a piezoelectric acoustic device, the density of the piezoelectric element 12, the diaphragm 11, the support member 2 and the peripheral
2, the diaphragm 11, the support member 2, and the peripheral member 3 are reduced in this order. That is, the density of the vibration plate 11 is lower than that of the piezoelectric element 12, the density of the support member 2 is lower than the vibration plate 11, and the density of the peripheral member 3 is lower than the support member 2. Tables 1 to 4 show examples of specific materials to be selected for the piezoelectric element 12, the vibration plate 11, the support member 2, and the peripheral member 3.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【表２】 [Table 2]
【００２４】[0024]
【表３】 [Table 3]
【００２５】[0025]
【表４】 [Table 4]
【００２６】これらの表から明らかな通り、圧電振動子
１の圧電素子１２の主要部となる圧電セラミクスの密度
は、７．９×１０3kg/m3であり、圧電振動子１の振動板
１１の密度は、アルミニウムが約７．７×１０3kg/m3、
ステンレスが約７．８×１０ 3kg/m3である。これに対
し、その周辺部にある支持部材２の密度は、カーボンが
４．３×１０3kg/m3、樹脂が１．１×１０3kg/m3、硬質
ゴムが１．５２×１０3kg/m3である。さらに、周辺部材
３の密度は、発泡スチロールが０．８×１０3kg/m3、低
密度カーボンが２．４×１０3kg/m3である。従って、支
持部材２の材料として硬質ゴムを選択した場合、周辺部
材３としては、低密度カーボンではなく、発泡スチロー
ルを選択することになる。As is clear from these tables, the piezoelectric vibrator
Density of piezoelectric ceramics that is the main part of the piezoelectric element 12
Is 7.9 × 10Threekg / mThreeAnd the diaphragm of the piezoelectric vibrator 1
The density of 11 is about 7.7 × 10Threekg / mThree,
Stainless steel is about 7.8 × 10 Threekg / mThreeIt is. Against this
However, the density of the support member 2 in the periphery thereof is
4.3 × 10Threekg / mThree, Resin is 1.1 × 10Threekg / mThree, Hard
1.52 × 10 rubberThreekg / mThreeIt is. Furthermore, peripheral members
The density of 3 is 0.8 × 10Threekg / mThree, Low
2.4 × 10 density carbonThreekg / mThreeIt is. Therefore,
When hard rubber is selected as the material of the holding member 2, the peripheral portion
Material 3 is not low density carbon but styrene foam
To select the file.
【００２７】例えば、表１に示された材質の組み合わせ
において、より具体的な圧電音響装置の例をあげる。チ
タン酸ジルコン酸鉛からなる直径１５ｍｍ、厚み０．０
５ｍｍの円板状の圧電セラミクスの両面をメタライズし
て電極を施した圧電素子１２を用意し、この圧電素子１
２を直径１７ｍｍ、厚み０．０２ｍｍの円板状のアルミ
ニウム板からなる振動板１１に貼り付けて、圧電振動子
１を構成する。For example, in the combination of materials shown in Table 1, a more specific example of a piezoelectric acoustic device will be described. Diameter 15mm, thickness 0.0 made of lead zirconate titanate
A piezoelectric element 12 was prepared by metalizing both sides of a 5 mm disk-shaped piezoelectric ceramic and applying electrodes.
The piezoelectric vibrator 1 is formed by attaching 2 to a diaphragm 11 made of a disc-shaped aluminum plate having a diameter of 17 mm and a thickness of 0.02 mm.
【００２８】この圧電振動子１の振動板１１の外周部を
内径１６ｍｍ、外径１９ｍｍ、厚み０．５５ｍｍの硬質
ゴム製のリング状の支持部材２で支持し、この支持部材
２の外周を厚み２ｍｍ外径１００ｍｍのリング状の発泡
スチロールからなる周辺部材３に取り付けた。An outer peripheral portion of the vibration plate 11 of the piezoelectric vibrator 1 is supported by a hard rubber ring-shaped support member 2 having an inner diameter of 16 mm, an outer diameter of 19 mm, and a thickness of 0.55 mm. It was attached to a peripheral member 3 made of a ring-shaped styrofoam having an outer diameter of 2 mm and a diameter of 100 mm.
【００２９】このように構成された圧電音響装置を、厚
み２０ｍｍ、５００ｍｍ四方のバッフル板に取り付け、
音源から１０ｃｍの場所にマイクを設置し、圧電素子１
２の両面の電極に１Ｖｒｍｓの正弦波信号を印加した場
合の音圧の周波数依存特性を測定した。これを実施例と
し、図３において、実線でその測定結果を示した。参考
までに周辺部材に密度がおよそ６．９の亜鉛合金を用い
て構成した圧電音響装置を比較例とし、同様にして測定
した音圧の周波数依存特性を図３に破線で示した。The thus constructed piezoelectric acoustic device is mounted on a baffle plate having a thickness of 20 mm and a square of 500 mm.
A microphone is placed 10 cm from the sound source, and the piezoelectric element 1
The frequency dependence of the sound pressure was measured when a sine wave signal of 1 Vrms was applied to the electrodes on both surfaces of No. 2. This was taken as an example, and the measurement result is shown by a solid line in FIG. For reference, a piezoelectric acoustic device having a peripheral member made of a zinc alloy having a density of about 6.9 was used as a comparative example, and the frequency dependence of the sound pressure measured in the same manner is shown by a broken line in FIG.
【００３０】前者の実施例では、後者の比較例に比べて
明らかに周波数特性に改善の効果が見られる。これは、
特に低域の振動が圧電振動子１から支持部材２を介して
周辺部材３に伝わり、そこから空気へと振動が伝わった
ためである。さらに、表２〜表４に示された材質の組み
合わせにおいても、前記実施例と同様に音圧の周波数依
存特性を測定したが、何れも比較例に比べて、周波数特
性に大きな改善がみられた。In the former embodiment, the effect of improving the frequency characteristics is clearly seen as compared with the latter comparative example. this is,
In particular, this is because the vibration in the low frequency range is transmitted from the piezoelectric vibrator 1 to the peripheral member 3 via the support member 2, and the vibration is transmitted to the air therefrom. Further, in the combinations of the materials shown in Tables 2 to 4, the frequency dependence of the sound pressure was measured in the same manner as in the above-described embodiment, but the frequency characteristics were significantly improved as compared with the comparative examples. Was.
【００３１】[0031]
【発明の効果】前述した通り、本発明による圧電音響装
置では、圧電素子１２から振動板１１、支持部材２を介
して周辺部材３へと、密度の大きな部材で発生した振動
を、密度が大きな部材から密度が小さな部材へ振動エネ
ルギを次第に伝えて行けるため、圧電素子１２から周辺
部材３に至るすべての部材が一つの振動発音体として扱
えるようになり、微少な圧電素子１２で大きな振動発音
体を駆動することが可能になる。これにより、ダイナミ
ックタイプスピーカに匹敵する音質が得られる圧電音響
装置を提供できることになる。As described above, in the piezoelectric acoustic device according to the present invention, the vibration generated by the high-density member from the piezoelectric element 12 to the peripheral member 3 via the diaphragm 11 and the supporting member 2 is applied to the high-density member. Since vibration energy can be gradually transmitted from a member to a member having a low density, all members from the piezoelectric element 12 to the peripheral member 3 can be handled as one vibration sounding body, and a large vibration sounding body is formed by the minute piezoelectric element 12. Can be driven. This makes it possible to provide a piezoelectric acoustic device that can achieve sound quality comparable to that of a dynamic type speaker.
【図１】本発明の一実施形態による圧電音響装置の構成
部材を示す半断面分解斜視図である。FIG. 1 is an exploded perspective view of a half section showing components of a piezoelectric acoustic device according to an embodiment of the present invention.
【図２】同実施形態による圧電音響装置の圧電振動子の
周辺部の支持構造を示す要部縦断側面図である。FIG. 2 is a vertical sectional side view showing a main part of a supporting structure of a peripheral portion of a piezoelectric vibrator of the piezoelectric acoustic device according to the embodiment.
【図３】本発明の実施例による圧電音響装置とそれと対
比すべき比較例の周波数−音圧特性を示すグラフであ
る。FIG. 3 is a graph showing frequency-sound pressure characteristics of a piezoelectric acoustic device according to an embodiment of the present invention and a comparative example to be compared with the piezoelectric acoustic device.
１ 圧電振動子 ２ 支持部材 ３ 周辺部材 １１ 振動板 １２ 圧電振動子 DESCRIPTION OF SYMBOLS 1 Piezoelectric vibrator 2 Support member 3 Peripheral member 11 Vibration plate 12 Piezoelectric vibrator
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石井 茂雄 東京都台東区上野６丁目16番20号 太陽誘 電株式会社内 Ｆターム(参考） 5D004 AA01 BB01 CC04 DD01 FF09 ──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Shigeo Ishii F-term (reference) in Taiyo Denki Co., Ltd. 6-16-20 Ueno, Taito-ku, Tokyo 5D004 AA01 BB01 CC04 DD01 FF09
Claims (3)
を有し、この圧電素子（１２）の長さあるいは径方向の
振動を屈曲振動に変換する圧電振動子（１）を有する圧
電音響装置において、圧電振動子（１）の圧電素子（１
２）からその周辺方向に接続されていく部材の密度が次
第に小さくなっていくことを特徴とする圧電音響装置。At least one piezoelectric element (12)
And a piezoelectric acoustic device having a piezoelectric vibrator (1) for converting vibration in the length or radial direction of the piezoelectric element (12) into bending vibration.
A piezoelectric acoustic device characterized in that the density of members connected in the peripheral direction from 2) gradually decreases.
り付けた圧電振動子（１）の周辺部が周辺部材（３）で
支持された圧電音響装置において、前記圧電振動子
（１）の周辺部が支持部材（２）を介して周辺部材
（３）に支持されており、圧電素子（１２）、振動板
（１１）、支持部材（２）及び周辺部材（３）を構成す
る材料の密度が、圧電素子（１２）、振動板（１１）、
支持部材（２）及び周辺部材（３）の順で大きいことを
特徴とする圧電音響装置。2. A piezoelectric acoustic device in which a peripheral portion of a piezoelectric vibrator (1) in which a piezoelectric element (12) is adhered to a vibration plate (11) is supported by a peripheral member (3). ) Is supported by the peripheral member (3) via the support member (2), and constitutes the piezoelectric element (12), the diaphragm (11), the support member (2), and the peripheral member (3). The density of the material is as follows: the piezoelectric element (12), the diaphragm (11),
A piezoelectric acoustic device characterized by being larger in the order of the support member (2) and the peripheral member (3).
ス、振動板（１１）が金属板からなり、支持部材（２）
は、樹脂、硬質ゴムまたはカーボンの何れかであり、周
辺部材（３）が発泡樹脂または低密度カーボンからなる
ことを特徴とする請求項２に記載の圧電音響装置。3. A main part of a piezoelectric element (12) is made of piezoelectric ceramics, a diaphragm (11) is made of a metal plate, and a support member (2).
The piezoelectric acoustic device according to claim 2, wherein the member is any one of resin, hard rubber and carbon, and the peripheral member (3) is made of foamed resin or low-density carbon.
Priority Applications (1)
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|---|---|---|---|
| JP2000155605A JP3830728B2 (en) | 2000-05-26 | 2000-05-26 | Piezoelectric sound device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000155605A JP3830728B2 (en) | 2000-05-26 | 2000-05-26 | Piezoelectric sound device |
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| Publication Number | Publication Date |
|---|---|
| JP2001339793A true JP2001339793A (en) | 2001-12-07 |
| JP3830728B2 JP3830728B2 (en) | 2006-10-11 |
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ID=18660528
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000155605A Expired - Fee Related JP3830728B2 (en) | 2000-05-26 | 2000-05-26 | Piezoelectric sound device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1881735A1 (en) * | 2006-07-20 | 2008-01-23 | Hosiden Corporation | Piezoelectric electroacoustic transducing device |
| EP1881736A2 (en) * | 2006-07-20 | 2008-01-23 | Hosiden Corporation | Piezoelectric electroacoustic transducing device |
| WO2012001901A1 (en) | 2010-06-30 | 2012-01-05 | 日本電気株式会社 | Vibration device |
| JP2012015760A (en) * | 2010-06-30 | 2012-01-19 | Nec Corp | Oscillator |
| KR101439935B1 (en) | 2013-07-19 | 2014-09-15 | 크레신 주식회사 | Sound Output Device |
| JP5985006B1 (en) * | 2015-05-30 | 2016-09-06 | オーツェイド株式会社 | Speaker |
-
2000
- 2000-05-26 JP JP2000155605A patent/JP3830728B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1881735A1 (en) * | 2006-07-20 | 2008-01-23 | Hosiden Corporation | Piezoelectric electroacoustic transducing device |
| EP1881736A2 (en) * | 2006-07-20 | 2008-01-23 | Hosiden Corporation | Piezoelectric electroacoustic transducing device |
| US7550899B2 (en) | 2006-07-20 | 2009-06-23 | Hosiden Corporation | Piezoelectric electroacoustic transducing device |
| US7629730B2 (en) | 2006-07-20 | 2009-12-08 | Hosiden Corporation | Piezoelectric electroacoustic transducing device |
| EP1881736A3 (en) * | 2006-07-20 | 2010-05-05 | Hosiden Corporation | Piezoelectric electroacoustic transducing device |
| WO2012001901A1 (en) | 2010-06-30 | 2012-01-05 | 日本電気株式会社 | Vibration device |
| JP2012015760A (en) * | 2010-06-30 | 2012-01-19 | Nec Corp | Oscillator |
| US9095880B2 (en) | 2010-06-30 | 2015-08-04 | Nec Corporation | Oscillator |
| KR101439935B1 (en) | 2013-07-19 | 2014-09-15 | 크레신 주식회사 | Sound Output Device |
| JP5985006B1 (en) * | 2015-05-30 | 2016-09-06 | オーツェイド株式会社 | Speaker |
| WO2016194857A1 (en) * | 2015-05-30 | 2016-12-08 | オーツェイド株式会社 | Speaker |
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| Publication number | Publication date |
|---|---|
| JP3830728B2 (en) | 2006-10-11 |
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