JP3032622B2 - Open ultrasonic microphone - Google Patents
Open ultrasonic microphoneInfo
- Publication number
- JP3032622B2 JP3032622B2 JP3243934A JP24393491A JP3032622B2 JP 3032622 B2 JP3032622 B2 JP 3032622B2 JP 3243934 A JP3243934 A JP 3243934A JP 24393491 A JP24393491 A JP 24393491A JP 3032622 B2 JP3032622 B2 JP 3032622B2
- Authority
- JP
- Japan
- Prior art keywords
- terminal block
- piezoelectric element
- vibration
- ultrasonic microphone
- open
- 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.)
- Expired - Lifetime
Links
Landscapes
- Piezo-Electric Transducers For Audible Bands (AREA)
- Transducers For Ultrasonic Waves (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は開放型超音波マイクロホ
ン、殊に送受波兼用型のものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open-type ultrasonic microphone, and more particularly, to an open-type ultrasonic microphone.
【０００２】[0002]
【従来の技術】特開昭５６−４２４９９号公報に示され
ている開放型超音波マイクロホンは、図２に示すよう
に、円盤状に形成されたアルミニウム材またはその他の
金属材からなる振動板１と、この振動板１の一面に貼り
合わせられたＰＺＴ系圧電セラミクス等からなる圧電素
子２と、上記振動板１の他面中央に頂点側が固着される
円錐状共振子３と、上記圧電素子２への入出力用端子４
１，４２を保持した端子台４と、これらを収納するとと
もに一端開口側に上記端子台４が固着され、他端開口側
にカラー６との間で金属製防塵用ネット７が挟持配設さ
れた筒体５とからなるものとして形成されている。両面
が電極となっている圧電素子２は、その一面がリード線
４３を介して入出力用端子４１に接続され、振動板１に
接着剤で固定された他面は、振動板１とリード線４４と
を介して入出力用端子４２に接続されている。図中８は
圧電素子２と端子台４との間に設けられて圧電素子２や
振動板１の振動が端子台４に伝わるのを防いでいる防振
材で、シリコン樹脂で形成されている。2. Description of the Related Art As shown in FIG. 2 , an open type ultrasonic microphone disclosed in Japanese Patent Application Laid-Open No. Sho 56-42499 is a diaphragm 1 made of a disc-shaped aluminum or other metal material. A piezoelectric element 2 made of PZT-based piezoelectric ceramics or the like bonded to one surface of the vibration plate 1; a conical resonator 3 whose top is fixed to the center of the other surface of the vibration plate 1; Input / output terminal 4
A terminal block 4 holding the first and second bases 42 is housed, and the terminal block 4 is fixed to one end opening side, and a metal dustproof net 7 is sandwiched and arranged between the other end opening side and the collar 6. The cylindrical body 5 is formed. One surface of the piezoelectric element 2 whose both surfaces are electrodes is connected to the input / output terminal 41 via a lead wire 43, and the other surface fixed to the diaphragm 1 with an adhesive is connected to the diaphragm 1 and a lead wire. 44, and is connected to the input / output terminal 42. In the figure, reference numeral 8 denotes a vibration damping material provided between the piezoelectric element 2 and the terminal block 4 to prevent the vibration of the piezoelectric element 2 and the vibration plate 1 from being transmitted to the terminal block 4, and is formed of silicone resin. .
【０００３】[0003]
【発明が解決しようとする課題】この開放型超音波マイ
クロホンを、自動扉用の人体検知センサーや駐車場にお
ける車検知センサーとして送受波兼用で用いる場合、残
響特性が問題となる。つまり送信時の残響が早期になく
ならないと、被検知物体までの距離が近距離となった
時、被検知物体からの反射波形と残響波形との識別が不
可能となり、結果として物体検知ができなくなってしま
う。When this open type ultrasonic microphone is used as a human body detection sensor for an automatic door or a car detection sensor in a parking lot for both transmitting and receiving waves, reverberation characteristics become a problem. In other words, if the reverberation during transmission does not disappear early, when the distance to the detected object becomes short, it becomes impossible to distinguish between the reflected waveform from the detected object and the reverberant waveform, and as a result, the object can be detected. Will be gone.
【０００４】本発明はこのような点に鑑み為されたもの
であり、その目的とするところは残響時間が短くて近距
離物体の検知能力が高い開放型超音波マイクロホンを提
供するにある。SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing, and an object of the present invention is to provide an open-type ultrasonic microphone having a short reverberation time and a high ability to detect a short-distance object.
【０００５】[0005]
【課題を解決するための手段】しかして本発明は、円盤
状に形成された振動板と、この振動板の一面に貼り合わ
せられた圧電素子と、上記振動板の他面に固着される円
錐状共振子と、上記圧電素子への入出力用端子を保持し
た端子台とを備えた開放型超音波マイクロホンにおい
て、一面が圧電素子に接する防振材が筒状で且つ先端外
周部が圧電素子の支持部となっている端子台の中央内部
に埋め込まれていることに第１の特徴を有し、更に円盤
状に形成された振動板と、この振動板の一面に貼り合わ
せられた圧電素子と、上記振動板の他面に固着される円
錐状共振子と、上記圧電素子への入出力用端子を保持し
た端子台と、これらを収納するとともに一端開口側に上
記端子台が固着され、他端開口側に防塵用ネットが配設
された筒体を備えた開放型超音波マイクロホンにおい
て、防塵用ネットがガラス製ネットで形成されているこ
とに第２の特徴を有するものである。According to the present invention, there is provided a vibration plate having a disk shape, a piezoelectric element bonded to one surface of the vibration plate, and a cone fixed to the other surface of the vibration plate. In an open-type ultrasonic microphone provided with a piezoelectric resonator and a terminal block holding input / output terminals for the piezoelectric element, the vibration-proof material whose one surface is in contact with the piezoelectric element is cylindrical and has a distal end.
Inside the center of the terminal block whose peripheral part is the support part of the piezoelectric element
Has the first feature of being embedded in the vibration plate, and further has a disk-shaped vibrating plate, a piezoelectric element bonded to one surface of the vibrating plate, and is fixed to the other surface of the vibrating plate. A conical resonator, a terminal block holding input / output terminals for the piezoelectric element, a terminal block for accommodating these, and the terminal block fixed to one end opening side, and a dustproof net disposed on the other end opening side. The open-type ultrasonic microphone provided with the cylindrical body has a second feature in that the dustproof net is formed of a glass net.
【０００６】本発明によれば、防塵用ネットそのものが
持つ振動抑制機能や防振材による振動抑制機能により、
端子台あるいは防塵用ネットの振動が抑制されるために
残響が早期に減衰するものである。According to the present invention, the vibration suppression function of the dust-proof net itself and the vibration suppression function of the vibration-proof material provide:
Since the vibration of the terminal block or the dustproof net is suppressed, the reverberation is attenuated early.
【０００７】[0007]
【実施例】以下本発明を図示の実施例に基づいて詳述す
る。なお、前記従来例と異なる部分のみについて説明す
る。従来例と実質的に同一の部材には同じ番号を付して
いる。図１に示すように、筒状で且つ先端外周部が圧電
素子２の支持部となっている端子台４の中央に防振材９
を埋め込むとともに、端子台４を貫通している防振材９
の一面を圧電素子２に接触させている。この防振材９
は、組み上がった超音波マイクロホンの端子台４の中央
の孔に液状で且つ一定時間の経過あるいは加熱による硬
化後に弾性体となるものを注入することで形成してい
る。端子台４の励振を防ぐとともに、圧電素子２の機械
的品質係数を落とすことにより残響が早期に減衰するよ
うにしているわけである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. Only the parts different from the conventional example will be described. Members that are substantially the same as those in the conventional example are given the same numbers. As shown in FIG. 1, the outer peripheral portion of the cylindrical
An anti-vibration material 9 is provided at the center of the terminal block 4 serving as a support for the element 2.
And a vibration isolating material 9 penetrating the terminal block 4.
Is in contact with the piezoelectric element 2. This anti-vibration material 9
Is formed by injecting a liquid material that becomes an elastic body after a certain period of time or after curing by heating into a central hole of the terminal block 4 of the assembled ultrasonic microphone. Excitation of the terminal block 4 is prevented, and the reverberation is attenuated early by lowering the mechanical quality factor of the piezoelectric element 2.
【０００８】また、ここでは筒体５の開口に取り付けら
れている防塵用ネット７を、金属製ではなく、ガラス繊
維製の柔軟性をもったもので形成している。振動板１か
らの振動エネルギーの伝搬による防塵用ネット７の励振
を防いでいるわけである。 [0008] Here, the dustproof net 7 attached to an opening of the cylindrical body 5, rather than a metal, are formed by those having the flexibility of glass fibers. This prevents the dustproof net 7 from being excited by the transmission of vibration energy from the diaphragm 1.
【０００９】[0009]
【発明の効果】以上のように本発明においては、防塵用
ネットそのものが持つ振動抑制機能や防振材による振動
抑制機能により、端子台あるいは防塵用ネットの振動が
抑制されるために残響が早期に減衰するものであり、こ
のために近距離物体からの反射波の受波に際して残響波
形が影響することがなくなり、近距離検知性能の向上を
図ることができる。As described above, in the present invention, the vibration of the terminal block or the dust-proof net is suppressed by the vibration-suppressing function of the dust-proof net itself and the vibration suppressing function of the vibration-proof material. The reverberation is attenuated at an early stage, so that the reverberation waveform is not affected when the reflected wave is received from a short-distance object, and the short-distance detection performance can be improved.
【図１】一実施例の断面図である。FIG. 1 is a cross-sectional view of one embodiment.
【図２】従来例の断面図である。FIG. 2 is a sectional view of a conventional example.
１ 振動板２ 圧電素子 ３ 共振子 ４ 端子台 ９ 防振材 DESCRIPTION OF SYMBOLS 1 Vibration plate 2 Piezoelectric element 3 Resonator 4 Terminal block 9 Anti-vibration material
Claims (2)
板の一面に貼り合わせられた圧電素子と、上記振動板の
他面に固着される円錐状共振子と、上記圧電素子への入
出力用端子を保持した端子台とを備えた開放型超音波マ
イクロホンであって、一面が圧電素子に接する防振材が
筒状で且つ先端外周部が圧電素子の支持部となっている
端子台の中央内部に埋め込まれていることを特徴とする
開放型超音波マイクロホン。1. A vibrating plate formed in a disk shape, a piezoelectric element bonded to one surface of the vibrating plate, a conical resonator fixed to the other surface of the vibrating plate, An open-type ultrasonic microphone having a terminal block holding input / output terminals, and a vibration-proof material having one surface in contact with the piezoelectric element.
An open-type ultrasonic microphone, which is embedded in the center of a terminal block having a cylindrical shape and an outer peripheral end portion serving as a supporting portion of a piezoelectric element .
板の一面に貼り合わせられた圧電素子と、上記振動板の
他面に固着される円錐状共振子と、上記圧電素子への入
出力用端子を保持した端子台と、これらを収納するとと
もに一端開口側に上記端子台が固着され、他端開口側に
防塵用ネットが配設された筒体を備えた開放型超音波マ
イクロホンであって、防塵用ネットがガラス製ネットで
形成されていることを特徴とする開放型超音波マイクロ
ホン。2. A vibration plate formed in a disk shape, a piezoelectric element bonded to one surface of the vibration plate, a conical resonator fixed to the other surface of the vibration plate, An open type ultrasonic microphone comprising a terminal block holding input / output terminals, and a cylindrical body accommodating the terminal block and having the terminal block fixed to one end opening side and a dustproof net disposed at the other end opening side. An open-type ultrasonic microphone, wherein the dust-proof net is formed of a glass net.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3243934A JP3032622B2 (en) | 1991-09-25 | 1991-09-25 | Open ultrasonic microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3243934A JP3032622B2 (en) | 1991-09-25 | 1991-09-25 | Open ultrasonic microphone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0583796A JPH0583796A (en) | 1993-04-02 |
| JP3032622B2 true JP3032622B2 (en) | 2000-04-17 |
Family
ID=17111206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3243934A Expired - Lifetime JP3032622B2 (en) | 1991-09-25 | 1991-09-25 | Open ultrasonic microphone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3032622B2 (en) |
-
1991
- 1991-09-25 JP JP3243934A patent/JP3032622B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0583796A (en) | 1993-04-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20000125 |