JPS60216697A - Ultrasonic ceramic microphone - Google Patents
Ultrasonic ceramic microphoneInfo
- Publication number
- JPS60216697A JPS60216697A JP7332784A JP7332784A JPS60216697A JP S60216697 A JPS60216697 A JP S60216697A JP 7332784 A JP7332784 A JP 7332784A JP 7332784 A JP7332784 A JP 7332784A JP S60216697 A JPS60216697 A JP S60216697A
- Authority
- JP
- Japan
- Prior art keywords
- cylindrical case
- elastic member
- ring
- vibrator
- case
- 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
- 239000000919 ceramic Substances 0.000 title claims abstract description 22
- 230000005855 radiation Effects 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims description 11
- 238000010030 laminating Methods 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、パーキングメータや、自動車後方検知装置な
どの屋外で使用する検知システムにも応用されるもので
、超音波の送信、受信を行う超音波セラミックマイクロ
ホンに関するものである。[Detailed Description of the Invention] Industrial Application Field The present invention is also applicable to detection systems used outdoors such as parking meters and automobile rear detection devices. It concerns ceramic microphones.
・ 従来例の構成とその問題点
従来のこの種の超音波セラミックマイクロホンについて
第１図とともに説明する。まず、１は圧電磁器振動子で
、断面が円錐台形状の底面部２１Ｌを有する金属製の筒
状ケース２の内底面に前記圧電磁器振動子１を貼合せて
、前記底面部をバイモルフ振動子として構成している。- Conventional structure and its problems A conventional ultrasonic ceramic microphone of this type will be explained with reference to FIG. First, reference numeral 1 denotes a piezoelectric ceramic vibrator, and the piezoelectric ceramic vibrator 1 is laminated to the inner bottom surface of a metal cylindrical case 2 having a bottom portion 21L having a truncated conical cross section, and the bottom portion is converted into a bimorph vibrator. It is configured as
３は端子板で、弾性接着剤を介して、前記筒状ケース２
の開孔端に固定してなるものである。４ａ、４ｂはリー
ド線で、端子板３に植設した端子５ａ、５ｂに接続し、
他端は、筒状ケース２及び圧電磁器振動子１の電極面に
接続して構成される。3 is a terminal plate, which is attached to the cylindrical case 2 via an elastic adhesive.
It is fixed to the end of the hole. 4a and 4b are lead wires connected to terminals 5a and 5b planted in the terminal board 3,
The other end is configured to be connected to the cylindrical case 2 and the electrode surface of the piezoelectric ceramic vibrator 1.
従来の構成によると金属製の筒状ケース２に一体化した
バイモルフ振動子を構成しているため、金属の高い共振
（の影響を受け、帯域幅が狭くなる問題があった。また
筒状ケース２に一体化しているため、ケース側部に機械
的振動が伝わると、振動部に干渉し、雑音を生じやすい
ものであった。According to the conventional configuration, since a bimorph resonator is integrated into a metal cylindrical case 2, there is a problem that the bandwidth becomes narrow due to the high resonance of the metal. 2, when mechanical vibration is transmitted to the side of the case, it interferes with the vibrating part and tends to generate noise.
発明の目的
本発明は前述の従来の欠点を解決するもので、振動部と
ケースを分離し、機械的振動雑音を弾性部材を介して吸
収し、安定した周波数特性を得るとともに、第２の共振
部である共鳴板を設け、音響的共振喝を下げ、抽域幅の
広い、超音波セラミックマイクロホンを提供することを
目的とするものである。Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks by separating the vibrating part and the case, absorbing mechanical vibration noise through an elastic member, obtaining stable frequency characteristics, and suppressing the second resonance. The purpose of the present invention is to provide an ultrasonic ceramic microphone which has a sounding plate which is a part of the antenna, lowers acoustic resonance, and has a wide extraction range.
発明の構成
この目的を達成するために゛本発明の超音波セラミック
マイクロホンは、圧電磁器振動子をそれより大きい径を
もつ金属製振動板に貼り合せてなるバイモルフ振動子の
周辺ヲリング状弾性部材の内周に接着固定し、中央部に
共鳴板、その周辺に支持部と放射口を有する筒状ケース
の内部に前記リング状弾性部材の外周辺を接着固定し、
筒状ケースの他端開孔口に端子板を挿入固定し、開孔端
を封止して構成するもので、音響変換効率を高め、屋外
でも使用できる高い信頼性をもたせるものである。Structure of the Invention In order to achieve this object, the ultrasonic ceramic microphone of the present invention uses a ring-shaped elastic member around a bimorph vibrator, which is made by bonding a piezoelectric ceramic vibrator to a metal diaphragm having a larger diameter. The outer periphery of the ring-shaped elastic member is adhesively fixed to the inside of a cylindrical case that has a sounding board in the center and a supporting part and a radiation port around the cylindrical case;
A terminal plate is inserted and fixed into an opening at the other end of a cylindrical case, and the opening end is sealed, thereby increasing acoustic conversion efficiency and providing high reliability that can be used outdoors.
実施例の説明
以下、本発明の一実施例における超音波セラミックマイ
クロホンについて第２図、第３図とともに説明する。な
お従来例と同じ部材は同一番号を付している。１は圧電
磁器振動子で、金属製振動板６の中央部に前記圧電磁器
振動子１を貼り合せ、バイモルフ振動子を構成する。バ
イモルフ振動子の外周部をリング状弾性部材７の内周に
接着固定し、前記リング状弾性部材７の外周部を、共鳴
板８ａと支持部８ｂ、放射口８０ｆ有する筒状ケース８
に内蔵し、内ケース９を前記筒状ケース８の一端開孔口
より挿入し、前記リング状弾性部材７を筒状ケース８の
固定部８ａ間で密着固定する。DESCRIPTION OF EMBODIMENTS An ultrasonic ceramic microphone according to an embodiment of the present invention will be described below with reference to FIGS. 2 and 3. Note that the same members as in the conventional example are given the same numbers. 1 is a piezoelectric ceramic vibrator, and the piezoelectric ceramic vibrator 1 is bonded to the center of a metal diaphragm 6 to form a bimorph vibrator. The outer periphery of the bimorph vibrator is adhesively fixed to the inner periphery of a ring-shaped elastic member 7, and the outer periphery of the ring-shaped elastic member 7 is formed into a cylindrical case 8 having a sounding plate 8a, a support portion 8b, and a radiation opening 80f.
The inner case 9 is inserted into the opening at one end of the cylindrical case 8, and the ring-shaped elastic member 7 is tightly fixed between the fixing portions 8a of the cylindrical case 8.
１０は端子板で、前記筒状ケース８の開孔端に挿入し、
内ケース９の他端に固定し、筒状ケース８の開孔口を封
止して構成する。１１は金属ベースで、電気的シールド
を行うもので、端子板１０に取り付けられる。４ａ、４
ｂはリード線で、圧電磁器振動子１と金属製振動板６に
接続し、他端を端子板１０に植設した端子ｓａ、ｓｂに
接続し電気信号の入出力を行う。前述の端子板封止部及
びリング状弾性部材７と筒状ケース８との接合部は、
。10 is a terminal plate inserted into the open end of the cylindrical case 8;
It is fixed to the other end of the inner case 9 and the opening of the cylindrical case 8 is sealed. Reference numeral 11 denotes a metal base that provides electrical shielding and is attached to the terminal board 10. 4a, 4
A lead wire b is connected to the piezoelectric ceramic vibrator 1 and the metal diaphragm 6, and the other end is connected to terminals sa and sb implanted in the terminal plate 10 to input and output electrical signals. The aforementioned terminal plate sealing portion and the joint portion between the ring-shaped elastic member 7 and the cylindrical case 8 are as follows:
.
接着剤で密封しても、本発明の効果は得られるものであ
る。また、筒状ケース８は、内部を保護すると同時に、
音響変換効率を高める機能を有するもので、金属製、あ
るいは樹脂製ケースを用、い、共鳴板８＆は、本発明の
実施例ではケース８と一体化して構成したが分離させて
も良い。放射口８Ｃは音響インピーダンスを小さくシ、
放射口８Ｃに異物が付着し目詰りしないために開孔率約
６０％以上にすることが望ましい。The effects of the present invention can also be obtained even when sealed with an adhesive. In addition, the cylindrical case 8 protects the inside and at the same time
It has a function of increasing sound conversion efficiency, and uses a metal or resin case.Although the resonance plate 8& is constructed integrally with the case 8 in the embodiment of the present invention, it may be separated. Radiation port 8C reduces acoustic impedance.
In order to prevent foreign matter from adhering to the radiation port 8C and clogging it, it is desirable that the aperture ratio be approximately 60% or more.
バイモルフ振動子を構成する金属製振動板６は、圧電磁
器振動子１の外径寸法より大きくし、機械共振Ｑ、 ’
（ｒ高くとると同時に、バイモルフ振動子周波数）の整
数倍か、あるいはその近傍に離れた位置に共鳴板８ａを
設けることにより、音響共振Ｑを下げ、共鳴板８ａ間で
空気共振を起こし、感度を上げ、帯域幅を広くするもの
である。第４図にその感度−周波数特性ムを示した。ま
たＢは従来例の特性を示す。The metal diaphragm 6 constituting the bimorph oscillator is made larger than the outer diameter of the piezoelectric ceramic oscillator 1 to achieve mechanical resonance Q, '
By setting the sounding plate 8a at an integer multiple of (the bimorph oscillator frequency) or at a distant position near it, the acoustic resonance Q is lowered, air resonance is caused between the sounding plates 8a, and the sensitivity is increased. It increases bandwidth and widens bandwidth. Figure 4 shows its sensitivity-frequency characteristics. Further, B shows the characteristics of the conventional example.
発明の効果
本発明によれば、振動部ヲリング状弾性部材に固定し、
筒状ケース内に支持固定しているため、筒状ケースと振
動部との振動干渉がなく、安定した特性を得るとともに
、バイモルフ振動子上面に共鳴板を設け、筒状ケース放
射面側を支持部と放射口で構成することにより、共鳴板
−趣バイモルフ振動子間に空気共振を発生し、バイモル
フ振動子の高い共振へか音響変換によって共振Ｑを下げ
、放射口及び共鳴板から音波が放射されるため、実質放
射面積が広くなり感度が高く、帯域幅の広い感度−周波
数特性をうろことができる。また、圧電磁器振動子を筒
状ケース内に密閉配置した構成のため、屋外での環境に
も耐える高い信頼性をもつ超音波セラミックマイクロホ
ンとすることができる。Effects of the Invention According to the present invention, the vibrating part is fixed to the ring-like elastic member,
Because it is supported and fixed within the cylindrical case, there is no vibration interference between the cylindrical case and the vibrating part, resulting in stable characteristics.A resonance plate is provided on the top of the bimorph oscillator to support the radiation side of the cylindrical case. By configuring the part and the radiation port, air resonance is generated between the sound board and the bimorph resonator, and the resonance Q is lowered by acoustic conversion to the high resonance of the bimorph resonator, and sound waves are radiated from the radiation port and the sound board. Therefore, the effective radiation area is wide, the sensitivity is high, and a sensitivity-frequency characteristic with a wide bandwidth can be achieved. Further, since the piezoelectric ceramic vibrator is arranged in a hermetically sealed cylindrical case, the ultrasonic ceramic microphone can be highly reliable and can withstand outdoor environments.
【図面の簡単な説明】
第１図は従来の超音波セラミックマイクロホンの断面図
、第２図、第３図は本発明の一実施例における超音波セ
ラミックマイクロホンの上面図と断面図、第４図は感度
−周波数特性で、従来例Ｂ 。
本発明ムとの比較を示したものである。
１・・・・・・圧電磁器振動子、６・・・・・・金属製
振動板、７・・・・・・リング状弾性部材、８・・・・
・・筒状ケース、８ａ・・・・・・共鳴板、８ｂ・・・
・・・支持部、８Ｃ・・・・・・放射口、９・・・・・
・内ケース、１０・・・・・・端子板。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第２図[Brief Description of the Drawings] Fig. 1 is a sectional view of a conventional ultrasonic ceramic microphone, Figs. 2 and 3 are a top view and a sectional view of an ultrasonic ceramic microphone according to an embodiment of the present invention, and Fig. 4 is the sensitivity-frequency characteristic of conventional example B. This figure shows a comparison with the inventive system. DESCRIPTION OF SYMBOLS 1...Piezoelectric ceramic vibrator, 6...Metal diaphragm, 7...Ring-shaped elastic member, 8...
...Cylindrical case, 8a...Resonance plate, 8b...
...Support part, 8C... Radiation port, 9...
・Inner case, 10...Terminal board. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2
Claims (1)
に貼シ合せてなるバイモルフ振動子の周辺をリング状弾
性部材の内周に接着固定し、中央部に共鳴板と周辺に支
持部と放射口を有する筒状ケースに前記リング状弾性部
材の外周辺を接着固定し、筒状ケースの他端開孔口に端
子板を挿入固定し、前記筒状ケースの開孔端を封止して
なる超音波セラミックマイクロホン。The periphery of a bimorph oscillator made by laminating a piezoelectric ceramic oscillator to a metal diaphragm with a larger diameter than that of the oscillator is adhesively fixed to the inner periphery of a ring-shaped elastic member, with a resonance plate in the center and a supporting part around the periphery. The outer periphery of the ring-shaped elastic member is adhesively fixed to a cylindrical case having a radiation opening, a terminal plate is inserted and fixed into the opening at the other end of the cylindrical case, and the opening end of the cylindrical case is sealed. Ultrasonic ceramic microphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7332784A JPS60216697A (en) | 1984-04-12 | 1984-04-12 | Ultrasonic ceramic microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7332784A JPS60216697A (en) | 1984-04-12 | 1984-04-12 | Ultrasonic ceramic microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60216697A true JPS60216697A (en) | 1985-10-30 |
Family
ID=13514961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7332784A Pending JPS60216697A (en) | 1984-04-12 | 1984-04-12 | Ultrasonic ceramic microphone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60216697A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009544366A (en) * | 2006-07-21 | 2009-12-17 | カーディアック ペースメイカーズ， インコーポレイテッド | Ultrasonic transducer for use in medical devices with implanted metal cavities |
| US9731141B2 (en) | 2007-06-14 | 2017-08-15 | Cardiac Pacemakers, Inc. | Multi-element acoustic recharging system |
-
1984
- 1984-04-12 JP JP7332784A patent/JPS60216697A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009544366A (en) * | 2006-07-21 | 2009-12-17 | カーディアック ペースメイカーズ， インコーポレイテッド | Ultrasonic transducer for use in medical devices with implanted metal cavities |
| US9731141B2 (en) | 2007-06-14 | 2017-08-15 | Cardiac Pacemakers, Inc. | Multi-element acoustic recharging system |
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