JPS5850895A - Electroacoustic transducer - Google Patents
Electroacoustic transducerInfo
- Publication number
- JPS5850895A JPS5850895A JP14915581A JP14915581A JPS5850895A JP S5850895 A JPS5850895 A JP S5850895A JP 14915581 A JP14915581 A JP 14915581A JP 14915581 A JP14915581 A JP 14915581A JP S5850895 A JPS5850895 A JP S5850895A
- Authority
- JP
- Japan
- Prior art keywords
- films
- oscillator
- piezoelectric film
- container
- piezoelectric
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims abstract 4
- 239000000463 material Substances 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 239000002861 polymer material Substances 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 229910010293 ceramic material Inorganic materials 0.000 claims 1
- 230000001154 acute effect Effects 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 230000010355 oscillation Effects 0.000 abstract 2
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
- H04R17/02—Microphones
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、高分子圧電材料又は、高分子材料と圧電ｌｉ
ａ！Ｇ材料の微粉末との複合物圧電材料（以下両者を総
称して圧電フィルムと呼１本、）を用いた電気音響変換
ＷＭＫ関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a polymer piezoelectric material or a polymer material and a piezoelectric li
a! The present invention relates to an electro-acoustic conversion WMK using a composite piezoelectric material (hereinafter both are collectively referred to as a piezoelectric film) and a fine powder of the G material.
従来、この種の電気音響変換器・は、圧電フィルムをプ
ラスチック等の振動基板に貼シ付けた構造であ−）是、
Ｌかるに、圧電フィルム紘圧電ｉａｓ轡に比し柔らかく
、弾性率で１／３ｏ程度であるため、高感度の電気音響
変換ｖｓを得るには圧電フィルムに大鰺な変位を与える
必要があるが、その変位は、振動基板の弾性率に支配さ
れ、充分な変位が得られない長点があり九。Conventionally, this type of electroacoustic transducer has a structure in which a piezoelectric film is attached to a vibrating substrate such as plastic.
However, since the piezoelectric film is softer than the piezoelectric film and has an elastic modulus of about 1/3, it is necessary to give a large displacement to the piezoelectric film in order to obtain high-sensitivity electroacoustic conversion. However, the displacement is controlled by the elastic modulus of the vibrating substrate, and there is a drawback that sufficient displacement cannot be obtained.
本発明は、振動体と圧電フィルムの間に振動伝達体を設
けることによシ上記欠点を除去し、高感度の電気音響変
換器を提供するものである。The present invention eliminates the above drawbacks by providing a vibration transmitter between the vibrator and the piezoelectric film, and provides a highly sensitive electroacoustic transducer.
次に本発明の実施例について図面を参照して説明する。Next, embodiments of the present invention will be described with reference to the drawings.
巣１図は本発明の第一の実施例で音響的に不透明な容器
１に振動体２を取９付け、これに「＜」の字状の振動伝
達体３．３’ｔ−設け、これの鋭角部分を凹形にして容
器１に固定されている圧電フィルム４．４’に接触又は
押し当てるように構成されている。Figure 1 shows the first embodiment of the present invention, in which a vibrating body 2 is attached to an acoustically opaque container 1, and a vibration transmitting body 3. The acute angle portion is concave so as to be in contact with or pressed against the piezoelectric film 4.4' fixed to the container 1.
次に作動の原瀝を説明する。なお、本発明の電気音響変
換器は電気から音響への変換及び音響から電気への変換
のいずれも可能でＩｈ３？、いわゆる可逆性を有するが
、以下音響から電気への変換の場合で説明する。Next, the basics of operation will be explained. Note that the electroacoustic transducer of the present invention is capable of converting both electricity to sound and sound to electricity. , which has so-called reversibility, will be explained below using the case of conversion from acoustic to electricity.
第１図において振動体２に到達した音波は振動体２によ
って機械エネルギーに変換され「＜」の字状の振動伝達
体３ 、３’を通って圧電フィルム４．４′ を変位さ
せ内部応力を発生させる。この内部応力に比例して圧電
フィルム４，４゛ に電圧が発生し電気端子５−６．５
’−６’関に到達音波に比例した出力電圧が得られる。In Fig. 1, the sound waves that reach the vibrating body 2 are converted into mechanical energy by the vibrating body 2, pass through the "<"-shaped vibration transmitting bodies 3, 3', displace the piezoelectric film 4, 4', and relieve internal stress. generate. A voltage is generated in the piezoelectric films 4, 4 in proportion to this internal stress, and the electrical terminals 5-6, 5
At the '-6' point, an output voltage proportional to the arriving sound wave is obtained.
また、第２図に示す様に振動伝達体３の一辺の長さをＬ
とし、振動−２と振動伝達体３の接合部をｙ。その方向
をｙ軸で表わし、振動伝達体３と圧電フィルム４の接合
部をｘｏ、その方向をＸ軸で表わす。いｔｙ。Also, as shown in Fig. 2, the length of one side of the vibration transmitting body 3 is L.
Let y be the joint between vibration-2 and vibration transmitter 3. The direction is represented by the y-axis, the joint between the vibration transmitting body 3 and the piezoelectric film 4 is represented by xo, and the direction is represented by the X-axis. Itty.
の変位がΔｙであったときのｘ００変位をΔＸとすると
、Δｙに対するΔＸの変化は次式で表わされ、ｙ、＝＝
Ｌで最大の変化率を示す。If the x00 displacement when the displacement of is Δy is ΔX, the change in ΔX with respect to Δy is expressed by the following formula, y, ==
L indicates the maximum rate of change.
したがって、振動伝達体３は、角度のたったＫ」の字状
である方が、効果的である。Therefore, it is more effective for the vibration transmitter 3 to have a K-shape with a small angle.
第３図は本発明の第二の実施例で、音響的に不透明な容
器１に振動体２をＷｉＬｐ付け、これに「月の字状の振
動伝達体７を設け、この先端部を凹形にして容器１に固
定されている圧電フィルム４に接触又拡押し当てた構造
を有する。FIG. 3 shows a second embodiment of the present invention, in which a vibrating body 2 is attached to an acoustically opaque container 1, a moon-shaped vibration transmitting body 7 is provided, and the tip thereof is shaped like a concave shape. It has a structure in which the piezoelectric film 4 that is fixed to the container 1 is brought into contact with or is pressed against the piezoelectric film 4 in an expanded manner.
上記説明では１片面輻射の実施例を示したが、前面と背
面に同一の指向性感度を得たい場合は、前面と背面に振
動体２を対称に設ければよい。In the above description, an example of single-sided radiation has been shown, but if it is desired to obtain the same directional sensitivity on the front and back surfaces, the vibrating bodies 2 may be provided symmetrically on the front and back surfaces.
１＋、本実施例では圧電フィルムが一枚の場合について
説明しであるが、２枚以上の圧電フィルムを直列又は並
列に接続して使用してもよい。1+: In this embodiment, the case where one piezoelectric film is used is described, but two or more piezoelectric films may be connected in series or in parallel.
以上の様に本発明は、振動体と圧電フィルムの間に振動
伝達体を設けると七により、圧電フィルムに充分な内部
応力を発生させることができる為高感度な電気音響変換
器を得ることができる。As described above, the present invention provides a highly sensitive electroacoustic transducer by providing a vibration transmitting body between the vibrating body and the piezoelectric film, which makes it possible to generate sufficient internal stress in the piezoelectric film. can.
第１図は本発明の第一の実施例の説明図で、音響面Ｋ１
１ｉ直な面で切った断面図、第２図は振動伝達体の動き
を示す説明図、第３図は本発明の第二の実施例の説明図
で、音響面に垂直な面で切った断面図である。
１・・・・・・容器、２・・・・・・振動体、３・・・
・・・振動伝達体、４・・・・・・圧電７（ルム、４１
・・・・・・圧電フィルム、５・・・・・・電極端子
５１・・・・・・電極端子、６・・・・・・電極端子、
６１ ・・・・・・電極端子、７・・・・・・振動伝達
体。
Ｖ １ ＠
猶２ ＠FIG. 1 is an explanatory diagram of the first embodiment of the present invention, in which the acoustic surface K1
1i is a cross-sectional view taken along a plane perpendicular to the acoustic plane; FIG. 2 is an explanatory diagram showing the movement of the vibration transmitting body; and FIG. FIG. 1... Container, 2... Vibrating body, 3...
... Vibration transmitter, 4... Piezoelectric 7 (lume, 41
...Piezoelectric film, 5...Electrode terminal
51... Electrode terminal, 6... Electrode terminal,
61... Electrode terminal, 7... Vibration transmitter. V 1 @Yu2 @
Claims (1)
器材料の微粉末との複合物圧電材料と振動体との間にこ
の振動体からの機械振動を前記圧電材料に伝達する伝達
手段を設は九ことを特徴とする電気音響変換器。A transmission means for transmitting mechanical vibrations from the vibrating body to the piezoelectric material is provided between a polymer piezoelectric material fixed to a container or a composite piezoelectric material of a polymer material and a fine powder of a piezoelectric ceramic material and a vibrating body. An electroacoustic transducer characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14915581A JPS5850895A (en) | 1981-09-21 | 1981-09-21 | Electroacoustic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14915581A JPS5850895A (en) | 1981-09-21 | 1981-09-21 | Electroacoustic transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5850895A true JPS5850895A (en) | 1983-03-25 |
Family
ID=15468984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14915581A Pending JPS5850895A (en) | 1981-09-21 | 1981-09-21 | Electroacoustic transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5850895A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2410767A1 (en) * | 2010-07-22 | 2012-01-25 | Commissariat à l'Énergie Atomique et aux Énergies Alternatives | MEMS dynamic pressure sensor, in particular for microphone-making applications |
| EP2410768A1 (en) * | 2010-07-22 | 2012-01-25 | Commissariat à l'Énergie Atomique et aux Énergies Alternatives | MEMS type acoustic pressure impulse generator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5086334A (en) * | 1973-11-28 | 1975-07-11 | ||
| JPS5145330U (en) * | 1974-09-29 | 1976-04-03 |
-
1981
- 1981-09-21 JP JP14915581A patent/JPS5850895A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5086334A (en) * | 1973-11-28 | 1975-07-11 | ||
| JPS5145330U (en) * | 1974-09-29 | 1976-04-03 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2410767A1 (en) * | 2010-07-22 | 2012-01-25 | Commissariat à l'Énergie Atomique et aux Énergies Alternatives | MEMS dynamic pressure sensor, in particular for microphone-making applications |
| EP2410768A1 (en) * | 2010-07-22 | 2012-01-25 | Commissariat à l'Énergie Atomique et aux Énergies Alternatives | MEMS type acoustic pressure impulse generator |
| FR2963192A1 (en) * | 2010-07-22 | 2012-01-27 | Commissariat Energie Atomique | MEMS TYPE PRESSURE PULSE GENERATOR |
| FR2963099A1 (en) * | 2010-07-22 | 2012-01-27 | Commissariat Energie Atomique | DYNAMIC MEMS PRESSURE SENSOR, IN PARTICULAR FOR MICROPHONE APPLICATIONS |
| US8783113B2 (en) | 2010-07-22 | 2014-07-22 | Commissariat à{grave over ( )} l'énergie atomique et aux énergies alternatives | MEMS dynamic pressure sensor, in particular for applications to microphone production |
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