JPH0147079B2 - - Google Patents
Info
- Publication number
- JPH0147079B2 JPH0147079B2 JP19214384A JP19214384A JPH0147079B2 JP H0147079 B2 JPH0147079 B2 JP H0147079B2 JP 19214384 A JP19214384 A JP 19214384A JP 19214384 A JP19214384 A JP 19214384A JP H0147079 B2 JPH0147079 B2 JP H0147079B2
- Authority
- JP
- Japan
- Prior art keywords
- tip
- microphone case
- elastic body
- space
- microphone
- 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
Links
- 238000002955 isolation Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 1
- 230000002093 peripheral effect Effects 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Transducers For Ultrasonic Waves (AREA)
Description
【発明の詳細な説明】
[技術分野]
本発明は超音波の送波器あるいは受波器として
用いられる超音波センサーに関する。Detailed Description of the Invention [Technical Field] The present invention relates to an ultrasonic sensor used as an ultrasonic transmitter or receiver.
[背景技術]
超音波の送受に使用される超音波センサーは、
その送波あるいは受波について指向性を持たせる
にあたつて、従来は第5図に示すように防振用の
筒状弾性体2で外周が保持されているマイクロフ
オンケース1にホーン3を設けていた。そしてこ
のホーン3は、単に狭指向性を持たせるという意
味からだけでなく、ホーン3がないとマイクロフ
オンの特性のばらつきが指向性のばらつきとなつ
て現われてしまうために、広指向性を持たせるも
のにおいても使用されていたのであるが、このよ
うなホーン3を用いることは、どうしても大形化
を招き、小形化省資源という要求に沿うことがで
きないものであつた。[Background technology] Ultrasonic sensors used for transmitting and receiving ultrasonic waves are
In order to provide directivity for transmitting or receiving waves, conventionally, as shown in FIG. It was set up. Horn 3 is designed not only to provide narrow directivity, but also to provide wide directivity because, without horn 3, variations in microphone characteristics would appear as variations in directivity. However, the use of such a horn 3 inevitably led to an increase in size and could not meet the demand for miniaturization and resource saving.
[発明の目的]
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、別途ホーンを必要
としないにもかかわらず、マイクロフオンの特性
のばらつきが指向性のばらつきとなるようなこと
がなく、小形化省資源を図ることができる超音波
センサーを提供するにある。[Objective of the Invention] The present invention has been made in view of the above points, and its purpose is to reduce the variation in the directivity due to the variation in the characteristics of the microphone, even though a separate horn is not required. An object of the present invention is to provide an ultrasonic sensor that can be miniaturized and save resources without causing such problems.
[発明の開示]
しかして本発明は、先端に振動片が設けられた
マイクロフオンケースの外周を防振用の筒状の弾
性体で保持するとともに、マイクロフオンケース
先端の振動片の外周領域においてマイクロフオン
ケースと弾性体との間に空間部を設けたことに特
徴を有し、マイクロフオンケースの先端とこのマ
イクロフオンケースの外周を保持する筒状の弾性
体との間に設けた空間部が、超音波のまわりこみ
を防いで所定の指向性を発揮させるようにしたも
のである。[Disclosure of the Invention] Accordingly, the present invention provides a structure in which the outer periphery of a microphone case provided with a vibrating piece at its tip is held by a cylindrical elastic body for vibration isolation, and the outer periphery of the vibrating piece at the tip of the microphone case is The feature is that a space is provided between the microphone case and the elastic body, and the space is provided between the tip of the microphone case and the cylindrical elastic body that holds the outer periphery of the microphone case. However, it is designed to prevent ultrasonic waves from going around and exhibit a predetermined directivity.
以下本発明を図示の実施例に基づいて詳述する
と、マイクロフオンケース1は第4図に示すよう
に、その先端内面に振動片4が配されたものであ
つて、先端部外周はテーパ面5とされている。そ
してこのマイクロフオンケース1の外周には、第
1図乃至第3図に示すように、振動片4への電気
駆動信号を停止させた後における振動を早期に減
衰させる防振用としての筒状の弾性体2を設け
て、この弾性体2でマイクロフオンケース1を保
持しているのであるが、マイクロフオンケース1
の先端部外周と、弾性体2の先端部内周面との間
には、マイクロフオンケース1先端外周をテーパ
面5としたことを利用した空間部6を設けてあ
り、このようなデイツプとしての空間部6の存在
により、超音波のまわりこみを防いでいるもので
ある。そして第1図に示すものにおいては、弾性
体2の先端部の内径をマイクロフオンケース1の
外径と同じとするとともに弾性体2の先端面をマ
イクロフオンケース1の先端面よりも後退させ
て、空間部6の容積を小さくしている。また第2
図に示すものにおいては、弾性体2の先端部内周
面の内径をマイクロフオンケース1の外径より大
きくして、弾性体2の先端部に凹所7を形成し、
これによつてマイクロフオンケース1の外径より
も大きな径を有する空間部6を形成している。こ
の場合、マイクロフオンケース1の先端部外周を
テーパ面5としておらなくともよい。更に第3図
に示すものにおいては、弾性体2の先端部に設け
る凹所7をマイクロフオンケース1に対して偏心
したものとし、マイクロフオンケース1の図中上
方についての空間部6は小さく、下方についての
空間部6は大きくして、一方に振つた指向性がで
るようにしているものである。 The present invention will be described below in detail based on the illustrated embodiment. As shown in FIG. It is said to be 5. As shown in FIGS. 1 to 3, the outer periphery of the microphone case 1 is provided with a cylindrical structure for vibration isolation, which quickly damps vibrations after the electric drive signal to the vibrating element 4 is stopped. An elastic body 2 is provided, and this elastic body 2 holds the microphone case 1.
A space 6 is provided between the outer circumference of the tip of the microphone case 1 and the inner circumference of the tip of the elastic body 2, making use of the fact that the outer circumference of the tip of the microphone case 1 is made into a tapered surface 5. The presence of the space 6 prevents ultrasonic waves from going around. In the case shown in FIG. 1, the inner diameter of the tip of the elastic body 2 is the same as the outer diameter of the microphone case 1, and the tip surface of the elastic body 2 is set back from the tip surface of the microphone case 1. , the volume of the space 6 is reduced. Also the second
In the case shown in the figure, the inner diameter of the inner peripheral surface of the tip of the elastic body 2 is made larger than the outer diameter of the microphone case 1, and a recess 7 is formed in the tip of the elastic body 2.
As a result, a space 6 having a diameter larger than the outer diameter of the microphone case 1 is formed. In this case, the outer periphery of the tip end of the microphone case 1 does not have to be the tapered surface 5. Furthermore, in the one shown in FIG. 3, the recess 7 provided at the tip of the elastic body 2 is eccentric with respect to the microphone case 1, and the space 6 in the upper part of the microphone case 1 in the figure is small. The space 6 at the bottom is made large so that the directivity is slanted to one side.
[発明の効果]
以上のように本発明においては、マイクロフオ
ンケースの振動片が配されている先端外周と、マ
イクロフオンケースの外周を保持する防振用の筒
状の弾性体の先端部との間に空間部を設けて、こ
の空間部により超音波のまわりこみを防いでいる
ものであり、広指向性とはいえ、指向性を持たせ
ることができるものであつて、マイクロフオンの
特性のばらつきが指向性のばらつきとなつて現わ
れることがなく、そして弾性体がホーンとしての
機能を発揮するために、別途ホーンを必要とせ
ず、小形化並びに省資源を図ることができるもの
である。[Effects of the Invention] As described above, in the present invention, the outer periphery of the tip of the microphone case where the vibrating piece is disposed, and the tip of the cylindrical elastic body for vibration isolation that holds the outer periphery of the microphone case. A space is provided in between, and this space prevents the ultrasonic waves from going around, and although it has wide directivity, it can have directivity, and it is a device that has a characteristic of a microphone. Since variations do not appear as directivity variations and the elastic body functions as a horn, a separate horn is not required, making it possible to downsize and save resources.
第1図a,bは本発明一実施例の断面図及び正
面図、第2図a,bは他の例の断面図及び正面
図、第3図a,bは更に他の例の断面図及び正面
図、第4図は同上のマイクロフオンケースの断面
図、第5図は従来例の断面図であつて、1はマイ
クロフオンケース、2は弾性体、4は振動片、5
はテーパ面、6は空間部を示す。
Figures 1a and b are sectional views and front views of one embodiment of the present invention, Figures 2 a and b are sectional views and front views of another example, and Figures 3 a and b are sectional views of yet another example. 4 is a sectional view of the same microphone case as above, and FIG. 5 is a sectional view of a conventional example, in which 1 is a microphone case, 2 is an elastic body, 4 is a vibrating piece, and 5
indicates a tapered surface, and 6 indicates a space.
Claims (1)
ースの外周を防振用の筒状の弾性体で保持すると
ともに、マイクロフオンケース先端の振動片の外
周領域においてマイクロフオンケースと弾性体と
の間に空間部を設けて成ることを特徴とする超音
波センサー。 2 マイクロフオンケースの先端部外周をテーパ
面として、このテーパ面と弾性体の先端部内周面
との間に空間部を形成して成ることを特徴とする
特許請求の範囲第1項記載の超音波センサー。[Scope of Claims] 1. The outer periphery of a microphone case having a vibrating piece at its tip is held by a cylindrical elastic body for vibration isolation, and the outer periphery of the vibrating piece at the tip of the microphone case is connected to the microphone case. An ultrasonic sensor characterized by having a space between it and an elastic body. 2. The ultrasonic device according to claim 1, wherein the outer circumference of the tip of the microphone case is a tapered surface, and a space is formed between the tapered surface and the inner circumferential surface of the tip of the elastic body. sonic sensor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19214384A JPS6169297A (en) | 1984-09-13 | 1984-09-13 | Ultrasonic sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19214384A JPS6169297A (en) | 1984-09-13 | 1984-09-13 | Ultrasonic sensor |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6169297A JPS6169297A (en) | 1986-04-09 |
JPH0147079B2 true JPH0147079B2 (en) | 1989-10-12 |
Family
ID=16286406
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19214384A Granted JPS6169297A (en) | 1984-09-13 | 1984-09-13 | Ultrasonic sensor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6169297A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2581743Y2 (en) * | 1992-06-19 | 1998-09-24 | 株式会社ミツバ | Ultrasonic sensor |
-
1984
- 1984-09-13 JP JP19214384A patent/JPS6169297A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6169297A (en) | 1986-04-09 |
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