JPH055756Y2 - - Google Patents
Info
- Publication number
- JPH055756Y2 JPH055756Y2 JP1984024346U JP2434684U JPH055756Y2 JP H055756 Y2 JPH055756 Y2 JP H055756Y2 JP 1984024346 U JP1984024346 U JP 1984024346U JP 2434684 U JP2434684 U JP 2434684U JP H055756 Y2 JPH055756 Y2 JP H055756Y2
- Authority
- JP
- Japan
- Prior art keywords
- case
- vibration
- piezoelectric element
- ultrasonic
- closed end
- 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
- 239000000919 ceramic Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Transducers For Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Description
【考案の詳細な説明】
本案は特に近距離に位置する物体の検知に用い
られる超音波セラミツクセンサに関するものであ
る。[Detailed Description of the Invention] The present invention relates to an ultrasonic ceramic sensor used particularly for detecting objects located at a short distance.
一個の超音波センサにより超音波を放射する送
波作用と、近接物体から反射された超音波を受信
する受波作用とを行なわせて近接物体を検出する
場合、超音波放射後も超音波センサの振動ケース
に振動が残つているとこれが残響（立下がり）時
間を長らしめて近接物体から反射され戻つてくる
超音波に重畳し、受信しようとする超音波を検出
できなくなる。 When detecting a nearby object by having a single ultrasonic sensor perform a transmitting action of emitting ultrasonic waves and a receiving action of receiving ultrasonic waves reflected from a nearby object, the ultrasonic sensor remains active even after emitting ultrasonic waves. If any vibration remains in the vibration case, this will prolong the reverberation (falling) time and will be superimposed on the ultrasound waves reflected from nearby objects and returned, making it impossible to detect the ultrasound waves that are being received.
そのため超音波放射後、直ちに振動ケースの振
動を減衰することが肝要になる。 Therefore, it is important to attenuate the vibration of the vibration case immediately after the ultrasonic wave is radiated.
本出願人は前記振動ケースを従来普通に使用さ
れる金属に代えＱの低い発泡性プラスチツク材料
より構成することによつて、その音響減衰効果を
利用して残響（立下がり）時間を、1.2msまで短
縮し得た超音波セラミツクセンサを開発し、先に
実願昭58−58527号として提示した処であるが、
更に実験を重ねた結果、振動ケースの側部の振動
が充分減衰されず僅かな振動が残つてこれが残響
（立下がり）時間をそれ以上短かくできないこと
を見出し、本案はかかる振動ケースの側部の残響
振動を除去することにより残響時間を一層短縮し
得たもので、以下図面について説明する。 The present applicant constructed the vibration case from a foamed plastic material with a low Q value instead of the conventional metal, and utilized its acoustic damping effect to reduce the reverberation (falling) time to 1.2 ms. We developed an ultrasonic ceramic sensor that could be shortened to
As a result of further experiments, it was discovered that the vibrations on the sides of the vibration case were not sufficiently damped and a small amount of vibration remained, making it impossible to further shorten the reverberation (falling) time. The reverberation time can be further shortened by removing reverberant vibrations, and the drawings will be explained below.
第１，２図において、１は発泡性プラスチツク
材料、例えばエポキシ樹脂中に50〜100ミクロン
のガラスマイクロバルーンを分散、混合せしめた
材料より凹状に成形された振動ケースで、閉端部
１ａを音波送受部として利用される。２は前記振
動ケース１の閉端部１ａの内面に一体に貼着され
た板状の圧電素子で、両面に電極２ａ，２ｂを具
える。３は前記振動ケースの開端部１ｂを封口す
るように嵌着された蓋板、４ａ，４ｂは該蓋板３
にそれぞれ上下に突出するよう植設された一対の
端子ピンで、ケース１内に配した金属細線５ａ，
５ｂにより圧電素子の各電極２ａ，２ｂと電気的
に導通する。６は前記蓋板３の外面とケースの開
端部１ｂとの間に形成された空所に充填されたシ
ール剤で、ここまでは上記先行技術に係る超音波
マイクロフオンと同じ構成である。 In Figures 1 and 2, 1 is a vibration case formed into a concave shape from a foamable plastic material, such as an epoxy resin in which glass microballoons of 50 to 100 microns are dispersed and mixed. Used as a transmitter and receiver. Reference numeral 2 denotes a plate-shaped piezoelectric element that is integrally attached to the inner surface of the closed end portion 1a of the vibration case 1, and has electrodes 2a and 2b on both sides. Reference numeral 3 denotes a cover plate fitted to seal the open end 1b of the vibration case, and 4a and 4b refer to the cover plate 3.
A pair of terminal pins are implanted so as to protrude upward and downward, respectively, and the thin metal wires 5a,
5b electrically conducts with each electrode 2a, 2b of the piezoelectric element. Reference numeral 6 denotes a sealing agent filled in a space formed between the outer surface of the cover plate 3 and the open end portion 1b of the case.Up to this point, the structure is the same as that of the ultrasonic microphone according to the prior art described above.
然るに本案の構成上の特徴は、振動ケース１の
側部１ｃの内外面のいずれか一方または両方に弾
性リング７，７′を圧着した処にある。 However, the structural feature of the present invention is that elastic rings 7, 7' are crimped onto either or both of the inner and outer surfaces of the side portion 1c of the vibration case 1.
尚、第１図のように振動ケースの側部１ｃの外
面に圧着リング７を外嵌する場合、圧着リング７
として伸縮性ゴム筒（第３図Ａ参照）を利用し、
また第２図のようにケースの側部１ｃの内面に圧
着リング７′を内嵌する場合、圧着リング７′とし
てスリツト７′ａを施した弾性金属筒（同図Ｂ参
照）を利用すると良い。 Note that when the crimp ring 7 is fitted onto the outer surface of the side portion 1c of the vibration case as shown in FIG.
Using an elastic rubber tube (see Figure 3A) as
In addition, when the crimp ring 7' is fitted inside the inner surface of the side part 1c of the case as shown in Fig. 2, it is preferable to use an elastic metal cylinder with a slit 7'a (see B in the same figure) as the crimp ring 7'. .
次に第４図は先行技術に係る超音波セラミツク
センサの送波パルス特性イと第１図に示す本案の
超音波セラミツクセンサの送波パルス特性ロを示
す。同図から本案の超音波センサの残響（立下が
り）時間は1mS以下と短かくなり、振動ケースの
側部に圧着した弾性リングによつて該側部の残響
振動を抑制していることが分る。 Next, FIG. 4 shows the transmission pulse characteristics (a) of the ultrasonic ceramic sensor according to the prior art and the transmission pulse characteristics (b) of the ultrasonic ceramic sensor of the present invention shown in FIG. The figure shows that the reverberation (falling) time of the proposed ultrasonic sensor is as short as 1 mS or less, and that the elastic ring crimped to the side of the vibration case suppresses reverberant vibration on the side. Ru.
以上の通り発泡性プラスチツク材料より凹状に
成形された振動ケースの閉端部を音波送受部とし
てその内面に圧電素子を貼着すると共に該圧電素
子と電気的に導通する端子ピンを植設した蓋板を
前記ケースの開端部に封着してなるものにおい
て、本案は上記振動ケースの側部の内外面のいず
れか一方または両方に弾性リングを圧着するだけ
の簡単な手段によつて残響時間を著しく短縮し得
たものであるから近接スイツチのセンサに利用し
て卓越した効果を発揮する。 As described above, the closed end of the vibration case, which is formed into a concave shape from a foamed plastic material, is used as a sound wave transmitting and receiving part, and a piezoelectric element is attached to the inner surface of the vibration case, and a lid is embedded with a terminal pin that is electrically connected to the piezoelectric element. In a case in which a plate is sealed to the open end of the case, the present invention reduces the reverberation time by simply crimping an elastic ring to one or both of the inner and outer surfaces of the side part of the vibration case. Since it can be significantly shortened, it can be used in proximity switch sensors to great effect.
第１図及び第２図はそれぞれ本案に係る超音波
セラミツクセンサフオンを示し、各Ａは一部を切
欠した平面図、各Ｂは縦断正面図である。第３図
Ａ，Ｂは前記第１図及び第２図の実施例に用いた
圧着リングの斜視図である。第４図は先行技術に
係る超音波セラミツクセンサの送波パルス特性図
イと本案に係る超音波センサの送波パルス特性図
ロを示す。尚、図中同一番号は同一部分を示す。
１……振動ケース、１ａ……閉端部、１ｂ……
開端部、１ｃ……側部、２……圧電素子、３……
蓋板、４ａ，４ｂ……端子ピン、７，７′……圧
着リング。
1 and 2 each show an ultrasonic ceramic sensor phon according to the present invention, each A is a partially cutaway plan view, and each B is a longitudinal sectional front view. 3A and 3B are perspective views of the crimp ring used in the embodiment of FIGS. 1 and 2. FIG. FIG. 4 shows a transmission pulse characteristic diagram A of the ultrasonic ceramic sensor according to the prior art and a transmission pulse characteristic diagram B of the ultrasonic sensor according to the present invention. Note that the same numbers in the figures indicate the same parts. 1... Vibration case, 1a... Closed end, 1b...
Open end, 1c... side part, 2... piezoelectric element, 3...
Cover plate, 4a, 4b... terminal pin, 7, 7'... crimp ring.
Claims (1)
振動ケースの閉端部を音波送受部としてその内面
に圧電素子を貼着すると共に該圧電素子と電気的
に導通する端子ピンを植設した蓋板を前記ケース
の開端部に封着してなるものにおいて、上記振動
ケースの側部の内外面のいずれか一方または両方
に弾性リングを圧着せしめたことを特徴とする超
音波セラミツクセンサ。 The closed end of the vibration case, which is formed into a concave shape from a foamed plastic material, is used as a sound wave transmitting and receiving section, and a piezoelectric element is attached to the inner surface of the closed end, and a lid plate is installed with a terminal pin that is electrically conductive to the piezoelectric element. 1. An ultrasonic ceramic sensor sealed to an open end of a case, characterized in that an elastic ring is crimped to one or both of the inner and outer surfaces of the side part of the vibrating case.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2434684U JPS60136599U (en) | 1984-02-21 | 1984-02-21 | Ultrasonic ceramic sensor |
| US06/659,281 US4556814A (en) | 1984-02-21 | 1984-10-10 | Piezoelectric ultrasonic transducer with porous plastic housing |
| EP84112594A EP0178346B1 (en) | 1984-02-21 | 1984-10-18 | Ultrasonic transducer |
| DK076485A DK168317B1 (en) | 1984-02-21 | 1985-02-19 | Ultrasonic transducer |
| DE3505872A DE3505872C2 (en) | 1984-02-21 | 1985-02-20 | Ultrasonic transducer with a piezoelectric element arranged in a closed housing |
| FR858502441A FR2559985B1 (en) | 1984-02-21 | 1985-02-20 | ULTRASONIC TRANSDUCER |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2434684U JPS60136599U (en) | 1984-02-21 | 1984-02-21 | Ultrasonic ceramic sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60136599U JPS60136599U (en) | 1985-09-10 |
| JPH055756Y2 true JPH055756Y2 (en) | 1993-02-15 |
Family
ID=30518409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2434684U Granted JPS60136599U (en) | 1984-02-21 | 1984-02-21 | Ultrasonic ceramic sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60136599U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60139399U (en) * | 1984-02-24 | 1985-09-14 | 日本特殊陶業株式会社 | Ultrasonic ceramic sensor |
| DE102012222239A1 (en) * | 2012-12-04 | 2014-06-05 | iNDTact GmbH | Measuring device and component with integrated measuring device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5347907U (en) * | 1976-09-24 | 1978-04-22 | ||
| JPS5618078U (en) * | 1979-07-19 | 1981-02-17 |
-
1984
- 1984-02-21 JP JP2434684U patent/JPS60136599U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5347907U (en) * | 1976-09-24 | 1978-04-22 | ||
| JPS5618078U (en) * | 1979-07-19 | 1981-02-17 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60136599U (en) | 1985-09-10 |
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