JPH0678397A - Piezoelectric sounder - Google Patents

Piezoelectric sounder

Info

Publication number
JPH0678397A
JPH0678397A JP22955592A JP22955592A JPH0678397A JP H0678397 A JPH0678397 A JP H0678397A JP 22955592 A JP22955592 A JP 22955592A JP 22955592 A JP22955592 A JP 22955592A JP H0678397 A JPH0678397 A JP H0678397A
Authority
JP
Japan
Prior art keywords
piezoelectric
diaphragm
resonance
sound pressure
fixed
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
JP22955592A
Other languages
Japanese (ja)
Inventor
Hiroshi Ito
伊藤浩
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.)
Taiyo Yuden Co Ltd
Original Assignee
Taiyo Yuden Co Ltd
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 Taiyo Yuden Co Ltd filed Critical Taiyo Yuden Co Ltd
Priority to JP22955592A priority Critical patent/JPH0678397A/en
Publication of JPH0678397A publication Critical patent/JPH0678397A/en
Pending legal-status Critical Current

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  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

PURPOSE:To obtain an almost flat sound pressure characteristic over a voice band of the user by fixing a thin plate shaped piezoelectric element on one major side of a thin diaphragm and fixing a resonance suppression member at least on one major side of a piezoelectric diaphragm. CONSTITUTION:A thin plate piezoelectric element 61 is fixed to one major side of a thin plate diaphragm 62 of a piezoelectric sounder 50 and a resonance suppression member 70 is fixed onto one major side 62a of the piezoelectric diaphragm 60 in which a surrounding part 62b of the diaphragm 62 is fixed in the inside of a container case 51. The metal-made or ceramic-made member 70 of coin shape whose weight is 0.35g, whose diameter is 10mm and whose thickness is nearly 0.6mm is used. The mass of the member 70 fixed onto the major side of the diaphragm 60 in the sounder 50 formed in this way causes a reaction against an action of a large amplitude fluctuation by the resonance of the diaphragm to act like suppressing amplitude fluctuation. Then the production of a peak of a rapid sound pressure level due to the resonance action is prevented over the operating voice band (nearly 500-4000Hz).

Description

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

【0001】[0001]

【産業上の利用分野】本発明は、電話機に適用されるこ
とにより、音声信号と電圧値との変換を行うように構成
された圧電振動板が収納された圧電発音体に関し、さら
に詳細には、前記圧電発音体の周波数ー音圧特性におけ
る共振作用による音圧レベルの急激なピークの発生を抑
えてフラットな周波数ー音圧特性が得られるように改良
を加えた新規な圧電発音体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 sounding body containing a piezoelectric vibrating plate configured to convert a voice signal into a voltage value when applied to a telephone. A novel piezoelectric sounding body improved so as to obtain a flat frequency-sound pressure characteristic by suppressing the occurrence of a sudden peak of the sound pressure level due to resonance action in the frequency-sound pressure characteristic of the piezoelectric sounding body Is.

【0002】[0002]

【従来の技術】近年の高度情報化時代を反映して、各種
通信手段も多様化の一途をたどっており、殊に電話器等
においても多種多様の機能を有するものが開発され、特
に室内等における通話場所に限定が加えられないよう
に、送受話部と電話器本体とが分離独立されて無線通信
により音声を送受するように構成された無線電話器、所
謂コードレステレホンの普及には目を見張るものがあ
る。さらには屋外にても自由に持ち運び可能で電話回線
が利用できる携帯電話の需要も拡大の一途である。
2. Description of the Related Art Reflecting the recent era of advanced information technology, various communication means are diversifying, and especially telephones and the like having various functions have been developed, especially indoors. In order not to add restrictions to the place of call in, the transmission / reception section and the main body of the telephone are separated and independent, and a wireless telephone configured to transmit and receive voice by wireless communication, a so-called cordless telephone is popular. There is something to watch. Furthermore, the demand for mobile phones that can be freely carried outdoors and have a telephone line is also expanding.

【0003】前記コードレステレホンや携帯電話におい
ては、送受話器と電話器本体が接続線にて接続されたも
のに比較して、音声を無線信号に変換するための電子回
路機能及び電源部等を送受話器に内蔵するとともに、該
送受話器本体を小型薄型に構成する必要がある。
In the above cordless telephone and mobile phone, an electronic circuit function for converting voice into a radio signal and a power supply unit are transmitted as compared with a handset and a telephone body connected by a connection line. It is necessary to build it in the handset and to make the main body of the handset small and thin.

【0004】これに対応すべく、電磁作用を利用した電
磁スピーカに代わって、前記送受話器における送話部及
び受話部を小型、薄型にて構成することの可能な圧電効
果を利用した圧電要素が利用されている。
In order to deal with this, instead of an electromagnetic speaker utilizing electromagnetic action, there is provided a piezoelectric element utilizing the piezoelectric effect which allows the transmitter and the receiver of the transmitter / receiver to be compact and thin. It's being used.

【0005】前記圧電要素が適用された圧電発音体の従
来例を、図4を参照することにより説明する。
A conventional example of a piezoelectric sounding body to which the piezoelectric element is applied will be described with reference to FIG.

【0006】圧電発音体10において、強誘電体等に圧
力または張力等を印加すると分極が発生して端面に静電
荷を生じる圧電効果或いは電界を印加すると機械的応力
を生じる電歪効果を有する圧電素子21は、PZT(チ
タン酸ジルコン酸鉛)磁器等の強誘電体セラミックスを
材質として薄円板状に形成されている。
In the piezoelectric sounding body 10, when a pressure or a tension is applied to a ferroelectric substance or the like, polarization is generated to generate an electrostatic charge on the end face, or a piezoelectric having an electrostrictive effect to generate a mechanical stress when an electric field is applied. The element 21 is made of ferroelectric ceramics such as PZT (lead zirconate titanate) porcelain and is formed in a thin disk shape.

【0007】該圧電素子21の両主面には、例えば銀等
の電気伝導性の良好なる電極23a、23bが膜状に塗
着形成されている。
Electrodes 23a and 23b having good electric conductivity, such as silver, are coated and formed on both main surfaces of the piezoelectric element 21 in a film shape.

【0008】前記電極が形成された圧電素子21は、真
鍮あるいはSUS(ステンレス)等を材質として該圧電
素子21よりも大径であって薄円板状に形成された振動
板22の振動板主面22aに、一方の電極23bを介在
して固着されることにより圧電振動板20が構成されて
いる。
The piezoelectric element 21 on which the electrodes are formed is made of brass, SUS (stainless steel) or the like, has a diameter larger than that of the piezoelectric element 21, and is a diaphragm of a diaphragm 22 formed in a thin disk shape. The piezoelectric vibrating plate 20 is configured by being fixed to the surface 22a with one electrode 23b interposed therebetween.

【0009】この際、前記圧電振動板20における圧電
素子21に被着された他方の電極23aの一端部及び前
記振動板22の一端部には、外部との電気的信号の授受
を行うための絶縁被覆導線25a、25bが半田24
a、24bにより固定されるとともに、例えば該圧電振
動板20のハウジング基体となる収納ケース11の開口
部分を覆う収納蓋12に配設された外部接続端子26
a、26bに半田接続されているものとする。
At this time, one end of the other electrode 23a attached to the piezoelectric element 21 of the piezoelectric vibrating plate 20 and one end of the vibrating plate 22 are used for exchanging electrical signals with the outside. Insulation conductors 25a and 25b are solder 24
The external connection terminals 26 are fixed by a and 24b, and are disposed on the storage lid 12 that covers the opening of the storage case 11 that serves as the housing base of the piezoelectric vibration plate 20, for example.
It is assumed that they are soldered to a and 26b.

【0010】ここに上記収納蓋12は圧電発音体10の
構成要素ではなく、一般に圧電発音体としては収納蓋を
有しそれ自体として開口部分を閉塞して成るもの(カプ
セル構造)、および収納蓋を有さず取付の対象たる送受
話器本体に開口部分を当接して閉塞されるもの(半開放
構造)の双方が含まれる(本例は収納蓋を有するカプセ
ル構造の圧電発音体である)。また前記絶縁被膜導線の
外部への導出方法は上記例に限らず用途・実装方法に応
じた導出方法があり、例えば収納ケースの側壁等に貫通
配設されているものもある。
Here, the storage lid 12 is not a component of the piezoelectric sounding body 10. Generally, the piezoelectric sounding body has a storage lid and the opening portion is closed by itself (capsule structure), and the storage lid. Both of those that are closed and have a semi-open structure by abutting the opening portion with the main body of the handset to be attached without this (the present example is a piezoelectric sounding body of a capsule structure having a storage lid). Further, the method of leading out the insulating coated conductor to the outside is not limited to the above-mentioned example, and there is a leading method according to the application / mounting method, and for example, there is a method of penetrating the side wall of the storage case or the like.

【0011】前記収納ケース11は、アルミニウムまた
は合成樹脂等を材質として、環状または多角状を有する
側壁と、一方が全面開口された圧電振動板20の収納取
付のための収納用開口部13と、該収納用開口部13に
相対した開口相対壁部19と、を有することにより断面
が略凹形状に加工成形されている。上記相対壁部19に
は放音孔27が設けられている。
The storage case 11 is made of aluminum, synthetic resin or the like, and has a side wall having an annular shape or a polygonal shape, and a storage opening 13 for storing and mounting the piezoelectric vibrating plate 20, one side of which is entirely opened. By having an opening relative wall portion 19 facing the storage opening portion 13, the cross section is processed and formed into a substantially concave shape. A sound emitting hole 27 is provided in the relative wall portion 19.

【0012】また前記収納蓋12の略中心部には、制動
孔14が開口されており、該制動孔14を収納蓋12の
内側において、メッシュ状に構成された音圧調整膜18
が被覆され、さらに接着剤等により固着されることによ
り、前記圧電振動板20の圧電振動に対する音圧を調整
できるように構成されている。
Further, a braking hole 14 is opened at a substantially central portion of the storage lid 12, and a sound pressure adjusting film 18 having a mesh shape is formed inside the storage lid 12 through the braking hole 14.
Is covered and further fixed with an adhesive or the like so that the sound pressure of the piezoelectric vibration plate 20 with respect to the piezoelectric vibration can be adjusted.

【0013】前記収納ケース11の内壁面の略中央に
は、該内面全周に亙って取付段部15が設けられてお
り、前記圧電振動板20が、本例においては圧電素子2
1を収納開口部13側に向くように、前記収納用開口部
13を介して収納ケース11に収納されるとともに、該
取付段部15において該圧電振動板20の振動板22の
周辺部22bが当接され、さらに、例えばシリコーン系
のシール用接着剤16により取付段部15の全周に亙っ
て塗着固定されている。
A mounting step portion 15 is provided at substantially the center of the inner wall surface of the storage case 11 over the entire circumference of the inner surface, and the piezoelectric vibrating plate 20 serves as the piezoelectric element 2 in this embodiment.
1 is housed in the housing case 11 through the housing opening 13 so that it faces the housing opening 13 side, and the peripheral portion 22b of the diaphragm 22 of the piezoelectric diaphragm 20 in the mounting step portion 15 is They are brought into contact with each other, and are further fixed by coating, for example, with a silicone-based sealing adhesive 16 over the entire circumference of the mounting step portion 15.

【0014】[0014]

【発明が解決しようとする課題】しかしながら、上記従
来の圧電発音体10によれば、取付段部15の全周に亙
って圧電振動板20の振動板周辺部22bが当接され、
シリコーン系のシール用接着剤16により固定されてい
るので、間接的に圧電振動板固有の共振周波数での音圧
のピーク現象、所謂共振作用が或る程度抑えられる構造
とはいえ、共振作用は完全には解消されず、振動板の寸
法および振動板の周囲における固定状態と収納ケースの
容積・形状にて決まる或使用音声帯域(特に3〜4kH
z付近の高周波数域)の周波数にて共振が起こり音圧レ
ベルが急に高くなるという問題点があった(図3の
(a)曲線参照)。即ち、コードレステレホンや携帯電
話にて話中に急に高い声で大きく耳に入ってくるので会
話に支障を来すという問題点があった。
However, according to the above-described conventional piezoelectric speaker 10, the diaphragm peripheral portion 22b of the piezoelectric diaphragm 20 is abutted over the entire circumference of the mounting step portion 15,
Since it is fixed by the silicone-based sealing adhesive 16, the peak effect of the sound pressure at the resonance frequency peculiar to the piezoelectric diaphragm, that is, the so-called resonance effect can be suppressed to some extent, but the resonance effect does not occur. It is not completely eliminated, but it is determined by the size of the diaphragm, the fixed state around the diaphragm, and the volume and shape of the storage case.
There has been a problem that resonance occurs at a frequency in the high frequency range (around z) and the sound pressure level suddenly rises (see the curve (a) in FIG. 3). That is, there is a problem in that the conversation suddenly comes into the ear with a high voice while talking on a cordless telephone or a mobile phone, which disturbs the conversation.

【0015】上記問題点は制動孔14および音圧調整膜
18による音圧の調整によっては一様な音圧レベルの低
下を招くのみで上記共振作用の抑制は十分に達成できな
い。
The above problem only causes a uniform decrease in the sound pressure level by adjusting the sound pressure by the braking hole 14 and the sound pressure adjusting film 18, and the resonance effect cannot be sufficiently suppressed.

【0016】本発明は、上記事情に鑑みてなされたもの
であり、音圧レベルを損なうことなく共振作用による周
波数ー音圧特性の急激な変動を抑えて、使用音声帯域の
広範囲に亙ってフラットな周波数ー音圧特性が得られる
ように構成された圧電発音体を提供するものである。
The present invention has been made in view of the above circumstances, and suppresses a rapid change in frequency-sound pressure characteristic due to resonance without impairing the sound pressure level, and covers a wide range of voice bands used. Provided is a piezoelectric sounding body configured to obtain a flat frequency-sound pressure characteristic.

【0017】[0017]

【課題を解決するための手段】本発明は、一方が全面開
口された断面が略凹形状の収納ケースと、薄板状振動板
の一方の主面に薄板状圧電素子が固着されるとともに該
振動板の周辺部が前記収納ケース内部に固定された圧電
振動板と、前記圧電振動板の少なくとも一主面上に固着
された共振抑制部材と、を有する構造を特徴とする圧電
発音体を提供することにより、上記目的を達成するもの
である。
SUMMARY OF THE INVENTION According to the present invention, a storage case having a substantially concave cross section, one side of which is fully opened, and a thin plate-shaped piezoelectric element fixed to one main surface of the thin plate-shaped diaphragm are used. A piezoelectric sounding body having a structure including a piezoelectric vibrating plate whose peripheral portion is fixed inside the housing case, and a resonance suppressing member fixed to at least one main surface of the piezoelectric vibrating plate. By doing so, the above object is achieved.

【0018】[0018]

【作用】本発明においては、圧電振動板の主面上に固着
された共振抑制部材が共振作用を抑制するように働き、
共振作用による急激な音圧レベルのピークの発生を使用
音声帯域(人間が音として聴こえる周波数範囲はおよそ
100Hz〜8kHzであるが、通常の使用音声帯域は
500Hz〜4kHzである。)に亙って防止できる。
In the present invention, the resonance suppressing member fixed on the main surface of the piezoelectric vibrating plate functions to suppress the resonance effect,
The occurrence of a sudden peak of the sound pressure level due to the resonance action is over the use voice band (the frequency range in which human beings can hear as sound is about 100 Hz to 8 kHz, but the normal use voice band is 500 Hz to 4 kHz). It can be prevented.

【0019】また、共振抑制部材の使用周波数帯域全体
における圧電振動に与える影響は共振抑制部材の位置お
よび質量・形状を調整して少なくでき、全体の音圧レベ
ルを損なうことはなく、音圧レベルの急激なピークが現
れる周波数近傍でのみ共振抑制部材の抑制効果が顕著に
現れる。
Further, the influence of the resonance suppressing member on the piezoelectric vibration in the entire operating frequency band can be reduced by adjusting the position, mass and shape of the resonance suppressing member, so that the sound pressure level is not impaired and the sound pressure level is not deteriorated. The suppression effect of the resonance suppression member appears remarkably only in the vicinity of the frequency at which the sharp peak of 1 appears.

【0020】[0020]

【実施例】本発明の実施例を、図面に基いて詳細に説明
する。
Embodiments of the present invention will be described in detail with reference to the drawings.

【0021】図1は本発明に係わる圧電発音体の実施例
を示す断面図である。
FIG. 1 is a sectional view showing an embodiment of a piezoelectric speaker according to the present invention.

【0022】図1において、圧電発音体50は、一方が
全面開口された断面が略凹形状の収納ケース51と、薄
板状振動板62の一方の主面に薄板状圧電素子61が固
着されるとともに該振動板62の周辺部62bが前記収
納ケース51内部に固定された圧電振動板60と、前記
圧電振動板60の一方の主面62a上に固着された共振
抑制部材70と、を有する構造を特徴とする。
In FIG. 1, the piezoelectric sounding body 50 has a storage case 51 having a substantially concave cross section with one side open, and a thin plate piezoelectric element 61 fixed to one main surface of a thin plate vibration plate 62. A structure having a piezoelectric vibrating plate 60 in which a peripheral portion 62b of the vibrating plate 62 is fixed inside the housing case 51, and a resonance suppressing member 70 fixed to one main surface 62a of the piezoelectric vibrating plate 60. Is characterized by.

【0023】さらに上記構造に加えて圧電発音体50は
圧電振動板60のハウジング基体となる収納ケース51
の開口部分53を覆う収納蓋52が開口縁部68にて固
着され、前記圧電振動板60における圧電素子61に被
着された他方の電極63aの一端部及び前記振動板62
の一端部には、外部との電気的信号の授受を行うための
絶縁被覆導線65a、65bが半田64a、64bによ
り固定されるとともに、収納蓋12に配設された外部接
続端子66a、66bに半田接続されており、圧電発音
体50の外部と入出力可能となっている。
In addition to the above structure, the piezoelectric sounding body 50 serves as a housing base of the piezoelectric vibrating plate 60 and is a storage case 51.
The storage lid 52 that covers the opening portion 53 is fixed at the opening edge portion 68, and one end portion of the other electrode 63 a attached to the piezoelectric element 61 of the piezoelectric vibrating plate 60 and the vibrating plate 62.
At one end of the connector, insulating coating conductors 65a and 65b for transmitting and receiving an electrical signal to and from the outside are fixed by solder 64a and 64b, and at the same time, to the external connection terminals 66a and 66b arranged on the storage lid 12. It is soldered and can be input and output to and from the outside of the piezoelectric sounding body 50.

【0024】以下上記圧電発音体50の主要部材につい
て各々詳述する。
The main members of the piezoelectric speaker 50 will be described in detail below.

【0025】圧電素子61は強誘電体等に圧力または張
力等を印加すると分極が発生して端面に静電荷を生じる
圧電効果或いは電界を印加すると機械的応力を生じる電
歪効果を有し、PZT(チタン酸ジルコン酸鉛)磁器等
の強誘電体セラミックスを材質として厚さ50〜100
μmの薄円板状に形成されている。
The piezoelectric element 61 has a piezoelectric effect that polarization occurs when a pressure or a tension is applied to a ferroelectric substance or the like to generate an electrostatic charge on the end face, or an electrostrictive effect that a mechanical stress occurs when an electric field is applied. (Lead zirconate titanate) 50 to 100 in thickness made of ferroelectric ceramics such as porcelain
It is formed in the shape of a thin disc of μm.

【0026】該圧電素子61の両主面には、例えば銀等
の電気伝導性の良好なる第1電極63a及び第2電極6
3bが薄膜状に被着形成されている。
On both main surfaces of the piezoelectric element 61, for example, a first electrode 63a and a second electrode 6 of silver or the like having good electric conductivity are provided.
3b is formed as a thin film.

【0027】前記電極が形成された圧電素子61は、真
鍮等を材質として該圧電素子61よりも大径であって薄
円板状に形成された厚さ50μm程度の振動板62の圧
電素子被着面62aに、該第2電極63bを介して固着
されており、該振動板62とともに圧電振動板60を構
成する。
The piezoelectric element 61 on which the electrodes are formed is made of brass or the like, has a diameter larger than that of the piezoelectric element 61, and is formed in a thin disk shape. The piezoelectric vibration plate 60 is fixed to the attachment surface 62a via the second electrode 63b, and constitutes the piezoelectric vibration plate 60 together with the vibration plate 62.

【0028】次に、上記収納ケース51は合成樹脂等を
材質として、環状または多角状を有する側壁と、一方が
全面開口された収納用開口部53と、該収納用開口部5
3に相対した開口相対壁部59と、を有することにより
断面が略凹形状に成形されている。
Next, the storage case 51 is made of synthetic resin or the like, and has a side wall having an annular shape or a polygonal shape, a storage opening portion 53 having one surface entirely opened, and the storage opening portion 5.
By having the opening relative wall portion 59 facing the No. 3, the cross section is formed into a substantially concave shape.

【0029】なお、前記開口相対壁部59の略中心部に
は、放音孔57が開口されている。一方、前記収納蓋5
2の略中心部には制動孔54が開口されており該制動孔
54を収納蓋52の内側において、メッシュ状に構成さ
れた音圧調整膜58が被覆され、さらに接着材により固
着されることにより、前記圧電要素60の圧電振動に対
する音圧の全体的な調整ができるように構成されてい
る。
A sound emitting hole 57 is opened at a substantially central portion of the opening relative wall portion 59. On the other hand, the storage lid 5
A braking hole 54 is opened at a substantially central portion of the second housing 2. The braking hole 54 is covered with a sound pressure adjusting film 58 having a mesh shape inside the housing lid 52, and further fixed by an adhesive material. Thus, the sound pressure for the piezoelectric vibration of the piezoelectric element 60 can be adjusted as a whole.

【0030】次に、前記収納ケース51の内壁面の略中
央部には、該内面全周に亙って取付段部55が形成され
ており、該取付段部55に、前記圧電要素60の圧電素
子61被着面と反対の振動板主面62cが前記開口相対
壁部59側に向くように周辺部62bにて当接され、例
えばシリコーン系のシール用接着剤56により固定され
ている。
Next, a mounting step portion 55 is formed on the inner wall surface of the storage case 51 over the entire circumference of the inner wall surface, and the mounting step portion 55 is provided with the piezoelectric element 60. The vibration plate main surface 62c opposite to the surface to which the piezoelectric element 61 is attached is abutted at the peripheral portion 62b so as to face the opening relative wall portion 59 side, and is fixed by, for example, a silicone-based sealing adhesive 56.

【0031】次に共振抑制部材70は重量0.35g、
直径10mm、厚さ0.6mm程度のコイン形状の金属
またはセラミックである。上記共振抑制部材70は圧電
振動板60の主面の少なくとも一主面上(振動板62の
主面62c上および圧電素子61の第1電極63a上)
に半田付、両面粘着テープ、または接着剤にて固着され
ている(本例においては圧電素子61の第1電極63a
上に一個)。上記共振抑制部材70の固着位置は主面の
略中心付近または中心から対称な位置に複数配置するの
が望ましい。
Next, the resonance suppressing member 70 weighs 0.35 g,
It is a coin-shaped metal or ceramic with a diameter of 10 mm and a thickness of about 0.6 mm. The resonance suppressing member 70 is on at least one main surface of the piezoelectric vibration plate 60 (on the main surface 62c of the vibration plate 62 and on the first electrode 63a of the piezoelectric element 61).
It is fixed to the surface of the piezoelectric element 61 by soldering, a double-sided adhesive tape, or an adhesive (in this example, the first electrode 63a of the piezoelectric element 61).
One on top). It is desirable that a plurality of fixing positions of the resonance suppressing member 70 are arranged near the center of the main surface or symmetrically with respect to the center.

【0032】図2は上記圧電発音体50における共振抑
制部材70を固着された圧電振動板60が収納ケース5
1に収納され、収納蓋52を開口部に封止する際の斜視
図である。
In FIG. 2, the piezoelectric vibrating plate 60 to which the resonance suppressing member 70 of the piezoelectric speaker 50 is fixed is stored in the storage case 5.
FIG. 3 is a perspective view when the storage lid 52 is housed in the first unit and the storage lid 52 is sealed in the opening.

【0033】上記のように構成された圧電発音体50に
よれば、圧電振動板60の主面上に固着された共振抑制
部材70の質量が振動板の共振作用による大きな振幅変
動から受ける作用の反作用を生みだし振幅変動を抑制す
るように働く。したがって共振作用による急激な音圧レ
ベルのピークの発生を使用音声帯域(約500Hz〜4
kHz)に亙って防止できる。
According to the piezoelectric sounding body 50 configured as described above, the mass of the resonance suppressing member 70 fixed on the main surface of the piezoelectric vibrating plate 60 is affected by a large amplitude fluctuation due to the resonance action of the vibrating plate. It produces a reaction and acts to suppress amplitude fluctuations. Therefore, the occurrence of a sudden peak of the sound pressure level due to the resonance action is used in the voice band (about 500 Hz-4
kHz) can be prevented.

【0034】図3は共振抑制部材(0.35g)の存在
以外は同構造の従来の圧電発音体10と本発明に係わる
圧電発音体50の周波数ー音圧特性を縦軸音圧(d
B)、横軸周波数(Hz)の片対数グラフにて示したも
のである。
FIG. 3 shows the frequency-sound pressure characteristics of the conventional piezoelectric sounding body 10 having the same structure and the piezoelectric sounding body 50 according to the present invention except for the presence of the resonance suppressing member (0.35 g).
B) is a semi-logarithmic graph of frequency (Hz) on the horizontal axis.

【0035】本発明者の実験によれば、図3に示される
ように従来の圧電発音体10の音圧特性(a)は1kH
zから4kHzの周波数帯域にて大きな音圧レベルの変
動が生じており、p1、p2のようなピークが発生して
いる。一方本発明に係わる圧電発音体50の音圧特性
(b)は上記周波数帯域においても概ねフラットであ
り、しかも音圧レベルも劣化しないという結果が得られ
た。
According to an experiment by the present inventor, as shown in FIG. 3, the sound pressure characteristic (a) of the conventional piezoelectric speaker 10 is 1 kHz.
A large change in sound pressure level occurs in the frequency band from z to 4 kHz, and peaks such as p1 and p2 occur. On the other hand, the sound pressure characteristic (b) of the piezoelectric sounding body 50 according to the present invention is substantially flat even in the above frequency band, and the sound pressure level is not deteriorated.

【0036】なお、本発明の主要構成部材である圧電振
動板に固着された共振抑制部材は本実施例のようなコイ
ン形状に限られるものではなく、例えばリング形状であ
ってもよく形状の制限はない。また該共振抑制部材の材
質も金属やセラミックに限らず部材として耐久性を有す
るものであれば他の材質でもよい。
The resonance suppressing member fixed to the piezoelectric vibrating plate, which is the main constituent member of the present invention, is not limited to the coin shape as in this embodiment, and may be, for example, a ring shape. There is no. Further, the material of the resonance suppressing member is not limited to metal or ceramics, and may be any other material as long as it has durability as a member.

【0037】さらに、前述のように圧電発音体としては
収納蓋を有しそれ自体として開口部分を閉塞して成るも
の(カプセル構造)、および収納蓋を有さず取付の対象
たる送受話器本体等に開口部分を当接して閉塞されるも
の(半開放構造)の双方が含まれるが、本発明に係わる
圧電発音体は両者の構造において包含されるものである
ことは言うまでもない。
Further, as described above, the piezoelectric sounding body having a storage lid and closing the opening portion itself (capsule structure), and a main body of a handset to be attached without a storage lid, etc. Include both those which are closed by contacting the opening (semi-open structure), but it goes without saying that the piezoelectric sounding body according to the present invention is included in both structures.

【0038】[0038]

【発明の効果】本発明に係わる圧電発音体は、上記のよ
うに構成されているため、振動板に固着された共振抑制
部材により、共振作用による音圧レベルの変動を抑える
ので、使用音声帯域にて概ねフラットな音圧特性を実現
することができるという優れた効果を有する。
Since the piezoelectric sounding body according to the present invention is configured as described above, the resonance suppressing member fixed to the diaphragm suppresses the fluctuation of the sound pressure level due to the resonance action. Has an excellent effect that a substantially flat sound pressure characteristic can be realized.

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

【図1】 本発明に係わる圧電発音体の実施例を示す断
面図
FIG. 1 is a cross-sectional view showing an embodiment of a piezoelectric speaker according to the present invention.

【図2】 本発明に係わる圧電発音体の実施例を示す斜
視図
FIG. 2 is a perspective view showing an embodiment of a piezoelectric speaker according to the present invention.

【図3】 本発明および従来の圧電発音体の周波数ー音
圧特性グラフ
FIG. 3 is a frequency-sound pressure characteristic graph of the present invention and the conventional piezoelectric speaker.

【図4】 従来の圧電発音体を示す断面図FIG. 4 is a sectional view showing a conventional piezoelectric speaker.

【符号の説明】[Explanation of symbols]

50 圧電発音体 51 収納ケース 52 収納蓋 53 収納開口部 54 制動孔 55 取付段部 56 シール用接着剤 57 放音孔 58 音圧調整膜 59 開口相対壁部 60 圧電振動板 61 圧電素子 62 振動板 62a 圧電素子被着面 62b 振動板周辺部 62c 62aの反対主面 63a 第1電極 63b 第2電極 64a、64b 絶縁被覆導線 65a、65b 半田 66a、66b 外部接続端子 68 ケース取付端部 70 共振抑制部材 50 Piezoelectric Sounder 51 Storage Case 52 Storage Lid 53 Storage Opening 54 Braking Hole 55 Mounting Step 56 Seal Adhesive 57 Sound Release Hole 58 Sound Pressure Adjustment Film 59 Open Relative Wall 60 Piezoelectric Vibration Plate 61 Piezoelectric Element 62 Vibration Plate 62a Piezoelectric element-attached surface 62b Vibrating plate peripheral portion 62c Opposite main surface of 62a 63a First electrode 63b Second electrode 64a, 64b Insulation coating conductor wire 65a, 65b Solder 66a, 66b External connection terminal 68 Case mounting end portion 70 Resonance suppressing member

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 一方が全面開口された断面が略凹形状の
収納ケースと、薄板状振動板の一方の主面に薄板状圧電
素子が固着されるとともに該振動板の周辺部が前記収納
ケース内部に固定された圧電振動板と、前記圧電振動板
の少なくとも一主面上に固着された共振抑制部材と、を
有する構造を特徴とする圧電発音体。
1. A storage case having a substantially concave cross-section with one side open, and a thin plate piezoelectric element fixed to one main surface of the thin plate vibration plate, and a peripheral portion of the vibration plate being the storage case. A piezoelectric sounding body having a structure having a piezoelectric vibrating plate fixed inside, and a resonance suppressing member fixed to at least one main surface of the piezoelectric vibrating plate.
JP22955592A 1992-08-28 1992-08-28 Piezoelectric sounder Pending JPH0678397A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22955592A JPH0678397A (en) 1992-08-28 1992-08-28 Piezoelectric sounder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22955592A JPH0678397A (en) 1992-08-28 1992-08-28 Piezoelectric sounder

Publications (1)

Publication Number Publication Date
JPH0678397A true JPH0678397A (en) 1994-03-18

Family

ID=16894006

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22955592A Pending JPH0678397A (en) 1992-08-28 1992-08-28 Piezoelectric sounder

Country Status (1)

Country Link
JP (1) JPH0678397A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100448108B1 (en) * 1999-06-30 2004-09-10 다이요 유덴 가부시키가이샤 Piezoelectric acoustic device and a method for manufacture thereof
RU2803960C1 (en) * 2022-03-17 2023-09-25 Шэньчжэнь Шокз Ко., Лтд. Acoustic output device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100448108B1 (en) * 1999-06-30 2004-09-10 다이요 유덴 가부시키가이샤 Piezoelectric acoustic device and a method for manufacture thereof
RU2803960C1 (en) * 2022-03-17 2023-09-25 Шэньчжэнь Шокз Ко., Лтд. Acoustic output device

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