JPH09307996A - Piezoelectric speaker - Google Patents

Piezoelectric speaker

Info

Publication number
JPH09307996A
JPH09307996A JP14510096A JP14510096A JPH09307996A JP H09307996 A JPH09307996 A JP H09307996A JP 14510096 A JP14510096 A JP 14510096A JP 14510096 A JP14510096 A JP 14510096A JP H09307996 A JPH09307996 A JP H09307996A
Authority
JP
Japan
Prior art keywords
diaphragm
auxiliary
piezoelectric speaker
piezoelectric
plate
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
Application number
JP14510096A
Other languages
Japanese (ja)
Inventor
Yasuo Omori
靖男 大森
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MEGASERA KK
Original Assignee
MEGASERA KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MEGASERA KK filed Critical MEGASERA KK
Priority to JP14510096A priority Critical patent/JPH09307996A/en
Publication of JPH09307996A publication Critical patent/JPH09307996A/en
Pending legal-status Critical Current

Links

Landscapes

  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain excellent sound quality with a wide band by suppressing a sound volume of a high frequency band for the piezoelectric speaker so as to increase the sound volume at a low frequency band. SOLUTION: A auxiliary diaphragm 20 is arranged in a case with a diaphragm 14 to which a piezoelectric ceramic plate 10 is adhered. The auxiliary diaphragm 20 is arranged closely nearly in parallel with the diaphragm 14. The surrounding of the diaphragm 14 and the auxiliary diaphragm 20 is supported by elastic bodies 17, 18, 23. The diaphragm 14 is vibrated by a voltage applied to the piezoelectric ceramic plate 10 and the auxiliary diaphragm 20 is vibrated in resonance therewith and a sound at a low frequency band which is unable to be obtained only by the diaphragm 14 is sounded.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、圧電スピーカに係
るもので、特に音質の改善が可能な圧電スピーカの構造
に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric speaker, and more particularly to a structure of a piezoelectric speaker capable of improving sound quality.

【0002】[0002]

【従来の技術】一般的にスピーカとしては電磁的に振動
を生じさせるタイプが用いられているが、小型化や低電
流駆動の目的で圧電素子によって振動を生じさせる圧電
スピーカも利用されている。この圧電スピーカは振動板
に貼り付けた圧電セラミック板に電圧を印加することに
よって振動を生じさせて音を発生させるものである。液
晶表示装置と併せて用いる場合など、磁歪を生じないと
いう利点もある。
2. Description of the Related Art Generally, a speaker which generates vibration electromagnetically is used as a speaker, but a piezoelectric speaker which generates vibration by a piezoelectric element is also used for the purpose of miniaturization and low-current driving. This piezoelectric speaker generates a sound by applying a voltage to a piezoelectric ceramic plate attached to a diaphragm to generate vibration. There is also an advantage that magnetostriction does not occur, for example, when used in combination with a liquid crystal display device.

【0003】圧電セラミックによる振動板は固有振動の
周波数が可聴周波数の高めの周波数に位置するため、音
質が悪く耳障りである問題があった。これを解決するた
めに、厚みを薄くしたり、形状を長方形にする他、取り
付け方法や材料の選択によって補正する試みがなされて
いるが、いずれも十分なものではなかった。また、寸法
を大きくすれば比較的低い周波数帯の音質が改善される
が、携帯機器等のスピーカとしては適さないという問題
がある。
[0003] A diaphragm made of piezoelectric ceramic has a problem that the sound quality is poor and harsh because the natural vibration frequency is located at a higher frequency than the audible frequency. In order to solve this problem, attempts have been made to reduce the thickness, to make the shape rectangular, and to make corrections by selecting an attachment method and a material, but none of them has been satisfactory. Further, if the size is increased, the sound quality in a relatively low frequency band is improved, but there is a problem that it is not suitable for a speaker of a portable device or the like.

【0004】[0004]

【発明が解決しようとする課題】本発明は、小型化が可
能で低域の周波数帯の音質を改善できる圧電スピーカを
提供するものである。
SUMMARY OF THE INVENTION The present invention provides a piezoelectric speaker which can be miniaturized and can improve the sound quality in a low frequency band.

【0005】[0005]

【課題を解決するための手段】本発明は、振動板ととも
に補助振動板を筐体内に配置し、これを振動させること
によって上記の課題を解決するものである。
DISCLOSURE OF THE INVENTION The present invention solves the above problems by placing an auxiliary diaphragm along with a diaphragm in a housing and vibrating the auxiliary diaphragm.

【0006】すなわち、筐体内に電極を形成した圧電セ
ラミック板を取り付けた振動板を配置した圧電スピーカ
において、振動板と平行に配置された補助振動板を具え
たことに特徴を有するものである。
That is, a piezoelectric speaker in which a vibrating plate having a piezoelectric ceramic plate with electrodes formed therein is arranged in a housing is characterized by including an auxiliary vibrating plate arranged in parallel with the vibrating plate.

【0007】[0007]

【発明の実施の態様】筐体内に圧電セラミック板を貼り
付けた振動板に近接させて、それと平行にポリカーボネ
イト等の補助振動板を配置する。これらの振動板と補助
振動板は周辺の少なくとも一部に弾性体などのスペーサ
を圧接して筐体内に固定する。圧電セラミック板の電極
には駆動用の配線が接続され、入力される電圧によって
振動を生じる。この圧電セラミック板の変位が振動板を
振動させるとともに、その振動に共鳴して補助振動板が
振動する。この補助振動板の振動によって低域の周波数
の音を発生させ、全体として周波数帯域を広げるもので
ある。
BEST MODE FOR CARRYING OUT THE INVENTION An auxiliary vibration plate such as polycarbonate is arranged in parallel with a vibration plate having a piezoelectric ceramic plate attached inside a housing. A spacer such as an elastic body is pressed against at least a part of the periphery of the diaphragm and the auxiliary diaphragm to fix them in the housing. Wiring for driving is connected to the electrodes of the piezoelectric ceramic plate, and vibration is generated by the input voltage. The displacement of the piezoelectric ceramic plate vibrates the diaphragm, and the auxiliary diaphragm vibrates in resonance with the vibration. By vibrating the auxiliary diaphragm, a low frequency sound is generated and the frequency band is broadened as a whole.

【0008】[0008]

【実施例】以下、図面を参照して、本発明の実施例につ
いて説明する。
Embodiments of the present invention will be described below with reference to the drawings.

【0009】図1は本発明の実施例を示す部分正面断面
図である。全体の形状は図2に示すような薄型の長方形
の金属ケース内に振動素子が固定された構造となる。金
属ケースは素子の収納スペースを具えた上板11と平板の
下板12から成っている。上板11には音を通す貫通孔13が
形成されている。素子等を収納した後に上板11に形成し
た突起を折り曲げて加締めて固定する。なお、貫通孔は
下板12に形成してもよい。金属以外のケースを用いる場
合でもほぼ同様の構造とすることができる。
FIG. 1 is a partial front sectional view showing an embodiment of the present invention. The overall shape is such that the vibrating element is fixed in a thin rectangular metal case as shown in FIG. The metal case includes an upper plate 11 having a storage space for elements and a lower plate 12 of a flat plate. The upper plate 11 has a through hole 13 through which sound passes. After housing the elements and the like, the projections formed on the upper plate 11 are bent, swaged and fixed. The through holes may be formed in the lower plate 12. Even when a case other than metal is used, almost the same structure can be obtained.

【0010】この例では、振動板14は0.1mm 程度の42ア
ロイ等を用いることができ、その寸法は30mm×25mm程度
とする。その中央部に13mm×16mmで厚さ0.1mm 程度の圧
電セラミック板を貼り付ける。圧電セラミック板の両面
には銀等の電極を形成し、それぞれの電極にはリード線
15を接続する。振動板14に貼り付けられる面の電極の接
続は、リード線を振動板14に半田付けすることによって
行うことができる。振動板にポリカーボネイト等を用い
て、金属板を接着し、その上に圧電セラミック板を配置
する構造とすることもできる。
In this example, the diaphragm 14 can be made of a 42 alloy or the like having a size of about 0.1 mm, and its size is about 30 mm × 25 mm. A piezoelectric ceramic plate of 13 mm x 16 mm and a thickness of about 0.1 mm is attached to the center part. Electrodes such as silver are formed on both sides of the piezoelectric ceramic plate, and lead wires are attached to each electrode.
Connect 15. The connection of the electrodes on the surface to be attached to the diaphragm 14 can be performed by soldering lead wires to the diaphragm 14. It is also possible to adopt a structure in which a metal plate is adhered to the diaphragm using polycarbonate or the like, and a piezoelectric ceramic plate is disposed thereon.

【0011】振動板14はその周辺部分を弾性体17、18に
よって挟持される。この弾性体17、18としてはシリコン
ゴム等が適しており、その厚みは0.7 〜1.1mm 程度が適
当である。振動板14を保持するためには上板11に接する
位置から内側に1.5 〜3.0mm程度必要である
The vibrating plate 14 is sandwiched by elastic members 17, 18 at its peripheral portion. Silicon rubber or the like is suitable for the elastic bodies 17 and 18, and the thickness thereof is preferably about 0.7 to 1.1 mm. In order to hold the diaphragm 14, it is necessary to have 1.5 to 3.0 mm inward from the position where it contacts the upper plate 11.

【0012】振動板14と上板11との間に補助振動板20を
配置する。この振動板20はポリカーボネイト等が適して
おり、厚みは0.1 〜0.5mm 程度とするとよい。寸法は振
動板14と同じとしてケース内に移動しないように固定す
る。なお、この補助振動板20に貫通孔21を形成しておく
とよい。
An auxiliary diaphragm 20 is arranged between the diaphragm 14 and the upper plate 11. Polycarbonate or the like is suitable for this diaphragm 20, and its thickness is preferably about 0.1 to 0.5 mm. The size is the same as that of the diaphragm 14, and is fixed so as not to move into the case. In addition, it is preferable to form the through hole 21 in the auxiliary diaphragm 20.

【0013】補助振動板20と上板11との間には弾性体23
を配置する。この弾性体23は弾性体17、18と同様にシリ
コンゴム等を用い、厚さは0.3 〜0.5mm 程度として他の
寸法は同じとする。この弾性体に代えて剛体のスペーサ
を用いることもできる。
An elastic body 23 is provided between the auxiliary diaphragm 20 and the upper plate 11.
Place. The elastic body 23 is made of silicon rubber or the like similarly to the elastic bodies 17 and 18, and has a thickness of about 0.3 to 0.5 mm and the other dimensions are the same. A rigid spacer may be used instead of the elastic body.

【0014】上板11内に弾性体23、補助振動板20、弾性
体17、振動板14を順次収納する。振動板14にはリード線
を接続しておき、これを上板11の側面の貫通孔から外部
に引き出す。次に弾性体18を収納し下板12で押さえ、上
板11の突起を折り曲げて組み立てる。したがって、組み
立てに際して接着等の工程は不要となる。
The elastic body 23, the auxiliary vibration plate 20, the elastic body 17, and the vibration plate 14 are sequentially housed in the upper plate 11. A lead wire is connected to the vibration plate 14 in advance, and this is pulled out from the through hole on the side surface of the upper plate 11 to the outside. Next, the elastic body 18 is housed, pressed by the lower plate 12, and the projections of the upper plate 11 are bent to assemble. Therefore, a step such as bonding at the time of assembly becomes unnecessary.

【0015】なお、振動板14の一部を上板11と接触しな
いように外部に引き出す構造を採用すれば、リード線の
挿通と半田付けの工数を低減することもできる。
By adopting a structure in which a part of the vibration plate 14 is pulled out so as not to contact the upper plate 11, it is possible to reduce the man-hours for inserting lead wires and soldering.

【0016】なお、補助振動板20に貫通孔を形成してお
くと、大入力時に生じる歪みを小さくすることができ
る。ただし、あまり大きくすると振動効率が低下するの
で最小限とすることが望ましい。
If a through hole is formed in the auxiliary diaphragm 20, it is possible to reduce the distortion generated at the time of a large input. However, if it is too large, the vibration efficiency decreases, so it is desirable to minimize it.

【0017】本発明は、上記の例に限られるものではな
く、材料と寸法は用途に応じて任意に選択することがで
きる。また、補助振動板を振動板の両側に配置したり、
片側に配置する枚数を複数にしてもよく、その材質や厚
みを異ならせてもよい。また、振動板と補助振動板を平
行でなく所定の角度を持たせて配置してもよい。そし
て、振動板と補助振動板の固定を他の方法で行うことも
できる。あるいは、補助振動板に筐体を兼用させる構造
としてもよい。
The present invention is not limited to the above examples, and the materials and dimensions can be arbitrarily selected according to the application. Also, arrange auxiliary diaphragms on both sides of the diaphragm,
The number of sheets arranged on one side may be plural, and the material and the thickness thereof may be different. Further, the diaphragm and the auxiliary diaphragm may be arranged not at parallel but at a predetermined angle. Then, the diaphragm and the auxiliary diaphragm can be fixed by other methods. Alternatively, the auxiliary diaphragm may also be used as a housing.

【0018】上記の例の圧電スピーカを用いたところ、
従来のものでは1.5kHz以上の周波数帯域の音しか得られ
なかったが、0.7 〜0.8kHzと低い周波数の音が得られる
ことも確認された。
Using the piezoelectric speaker of the above example,
It was confirmed that the conventional one could only obtain sounds in the frequency band of 1.5 kHz or higher, but could obtain sounds in the low frequency range of 0.7 to 0.8 kHz.

【0019】なお、下板に貫通孔を形成するとより低域
側の改善がなされることも確認された。これによって、
圧電スピーカを取り付ける基板等の固有の振動も利用で
きるためである。
It was also confirmed that forming a through hole in the lower plate improves the lower frequency band. by this,
This is because the vibration peculiar to the substrate on which the piezoelectric speaker is mounted can also be used.

【0020】[0020]

【発明の効果】本発明によれば、小型の形状を維持した
ままで従来得られなかった低域の音質の改善が可能とな
る。従来高域側が強くて耳障りであったが、相対的に高
域側が抑えられ、広帯域で良好な特性が得られるためで
ある。
According to the present invention, it is possible to improve the low-frequency sound quality, which has not been obtained conventionally, while maintaining a small size. Conventionally, the high-frequency side is strong and uncomfortable, but the relatively high-frequency side is relatively suppressed, and good characteristics can be obtained in a wide band.

【0021】また、補助振動板に貫通孔を具える構造を
採用すれば、大入力時の歪みを防止することができる利
点もあり、その面でも音質の改善が可能である。
Further, if the structure in which the auxiliary diaphragm is provided with a through hole is adopted, there is an advantage that distortion at the time of a large input can be prevented, and in that respect, the sound quality can be improved.

【0022】更に、筐体内に振動板や弾性体を収納する
だけで組み立てを行うことができるので、組立工数の低
減が可能となる。接着等の工程が不要となる利点だけで
なく、信頼性の面でも有利となる。
Further, since the assembly can be performed only by housing the diaphragm and the elastic body in the housing, the number of assembling steps can be reduced. This is advantageous not only in that the step of bonding or the like becomes unnecessary, but also in terms of reliability.

【図面の簡単な説明】[Brief description of drawings]

【図1】 本発明の実施例を示す部分正面断面図FIG. 1 is a partial front sectional view showing an embodiment of the present invention.

【図2】 本発明の実施例を示す(a)は平面図、
(b)は正面図
FIG. 2A is a plan view showing an embodiment of the present invention,
(B) is a front view

【符号の説明】[Explanation of symbols]

11:上板 12:下板 14:振動板 20:補助振動板 17、18、23:弾性体 11: Upper plate 12: Lower plate 14: Vibration plate 20: Auxiliary vibration plates 17, 18, 23: Elastic body

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 筐体内に電極を形成した圧電セラミック
板を取り付けた振動板を配置した圧電スピーカにおい
て、振動板と平行に配置された補助振動板を具えたこと
を特徴とする圧電スピーカ。
1. A piezoelectric speaker in which a vibrating plate having a piezoelectric ceramic plate formed with electrodes formed therein is arranged in a housing, the piezoelectric speaker comprising an auxiliary vibrating plate arranged in parallel with the vibrating plate.
【請求項2】 筐体内に電極を形成した圧電セラミック
板を取り付けた振動板を配置した圧電スピーカにおい
て、振動板と平行に配置された補助振動板を具え、振動
板と補助振動板の周辺の少なくとも一部がスペーサを介
して筐体内に固定されたことを特徴とする圧電スピー
カ。
2. A piezoelectric speaker in which a diaphragm having a piezoelectric ceramic plate with electrodes formed therein is disposed in a housing, the piezoelectric speaker includes an auxiliary diaphragm arranged in parallel with the diaphragm, and A piezoelectric speaker characterized in that at least a part of the piezoelectric speaker is fixed in the housing through a spacer.
【請求項3】 筐体内に電極を形成した圧電セラミック
板を取り付けた振動板を配置した圧電スピーカにおい
て、振動板と平行に配置された補助振動板を具え、振動
板と補助振動板の周辺の少なくとも一部が弾性体を介し
て筐体内に固定されたことを特徴とする圧電スピーカ。
3. A piezoelectric speaker in which a diaphragm having a piezoelectric ceramic plate with electrodes formed therein is arranged in a housing, the piezoelectric speaker includes an auxiliary diaphragm arranged in parallel with the diaphragm, and A piezoelectric speaker characterized in that at least a part of the piezoelectric speaker is fixed in the housing through an elastic body.
【請求項4】 筐体内に電極を形成した圧電セラミック
板を取り付けた振動板を配置した圧電スピーカにおい
て、振動板と平行に配置された貫通孔を有する補助振動
板を具えたことを特徴とする圧電スピーカ。
4. A piezoelectric speaker in which a diaphragm having a piezoelectric ceramic plate with electrodes formed therein is disposed in a housing, the auxiliary speaker having a through-hole arranged in parallel with the diaphragm. Piezoelectric speaker.
【請求項5】 補助振動板を複数具えた請求項1、請求
項2、請求項3または請求項4記載の圧電スピーカ。
5. The piezoelectric speaker according to claim 1, 2, 3, or 4, comprising a plurality of auxiliary diaphragms.
JP14510096A 1996-05-15 1996-05-15 Piezoelectric speaker Pending JPH09307996A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14510096A JPH09307996A (en) 1996-05-15 1996-05-15 Piezoelectric speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14510096A JPH09307996A (en) 1996-05-15 1996-05-15 Piezoelectric speaker

Publications (1)

Publication Number Publication Date
JPH09307996A true JPH09307996A (en) 1997-11-28

Family

ID=15377379

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14510096A Pending JPH09307996A (en) 1996-05-15 1996-05-15 Piezoelectric speaker

Country Status (1)

Country Link
JP (1) JPH09307996A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003339091A (en) * 2002-03-15 2003-11-28 Matsushita Electric Ind Co Ltd Loudspeaker system
JP2004080198A (en) * 2002-08-13 2004-03-11 Nippon Telegr & Teleph Corp <Ntt> Electroacoustic transducer
US7212648B2 (en) 2002-03-15 2007-05-01 Matsushita Electric Industrial Co., Ltd. Loudspeaker system in which a diaphragm panel is driven by an electromechanical acoustic converter
WO2012011711A3 (en) * 2010-07-21 2012-03-15 아이폰 일렉트로닉스 엘티디 Electro-acoustic transducer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003339091A (en) * 2002-03-15 2003-11-28 Matsushita Electric Ind Co Ltd Loudspeaker system
US7212648B2 (en) 2002-03-15 2007-05-01 Matsushita Electric Industrial Co., Ltd. Loudspeaker system in which a diaphragm panel is driven by an electromechanical acoustic converter
JP2004080198A (en) * 2002-08-13 2004-03-11 Nippon Telegr & Teleph Corp <Ntt> Electroacoustic transducer
WO2012011711A3 (en) * 2010-07-21 2012-03-15 아이폰 일렉트로닉스 엘티디 Electro-acoustic transducer
KR200459713Y1 (en) * 2010-07-21 2012-04-12 아이폰 일렉트로닉스 엘티디 Electro-acoustic transducer

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