JPH0141279Y2 - - Google Patents
Info
- Publication number
- JPH0141279Y2 JPH0141279Y2 JP1984050347U JP5034784U JPH0141279Y2 JP H0141279 Y2 JPH0141279 Y2 JP H0141279Y2 JP 1984050347 U JP1984050347 U JP 1984050347U JP 5034784 U JP5034784 U JP 5034784U JP H0141279 Y2 JPH0141279 Y2 JP H0141279Y2
- Authority
- JP
- Japan
- Prior art keywords
- cylindrical side
- case
- vibration
- ultrasonic
- vibration 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.)
- Expired
Links
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.
一個の超音波セラミツク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。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。 When detecting a nearby object by using a single ultrasonic ceramic sensor to perform a transmitting action that emits ultrasonic waves and a receiving action that receives ultrasonic waves reflected from a nearby object, the ultrasonic If vibrations remain in the sensor's vibration case, this will lengthen the reverberation (falling) time, be reflected from nearby objects, and be superimposed on the returning ultrasonic waves, making it impossible to detect the ultrasonic waves that the sensor is trying to receive. 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全体を従来普通に使
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
短縮し得た超音波マイクロフオンを開発し、先に
実願昭58−58527号として出願した処であるが、
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 entire vibration case from a foamed plastic material with a low Q value instead of the conventional metal, and took advantage of its acoustic damping effect to reduce the reverberation (falling) time to 1.2 ms. He developed an ultrasonic microphone that could be shortened to 100,000 yen, and filed an application as Utility Application No. 58-58527.
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 on the sides, and the drawings will be explained below.
第１図は上記先行技術による超音波セラミツク
センサを示し、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有
底筒状に成形された振動ケースで、底部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の底部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口部１ｂを封口するように嵌
着された蓋板、４ａ，４ｂは該蓋板３に夫々上下
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口部１ｂとの間
に形成された空所に充填されたシール剤である。 FIG. 1 shows an ultrasonic ceramic sensor according to the above-mentioned prior art, in which 1 is formed into a bottomed cylindrical shape from a foamable plastic material such as an epoxy resin in which glass microballoons of 50 to 100 microns are dispersed and mixed. It is a vibration case, and the bottom part 1a is used as a sound wave transmitting/receiving part. Reference numeral 2 denotes a plate-shaped piezoelectric element that is integrally attached to the inner surface of the bottom portion 1a of the vibration case 1, and has electrodes 2a and 2b on both sides. Reference numeral 3 designates a lid plate fitted to seal the opening 1b of the vibration case, and 4a and 4b designate a pair of terminal pins implanted in the lid plate 3 so as to project upward and downward, respectively. The thin metal wires 5a and 5b provided are electrically connected to the respective electrodes 2a and 2b of the piezoelectric element. 6
is a sealant filled in a space formed between the outer surface of the lid plate 3 and the opening 1b of the case.
次に第２図から第４図はそれぞれ本案による超
音波セラミツクセンサを示し、上記第１図の先行
技術のものと構成上の相異点は、有底筒状をなす
振動ケース１′を底部（音波送受部）１a′と円筒
側部１c′とに分割し、底部１a′を第１図において
説明したものと同様の発泡性プラスチツク材料で
製し、円筒側部１c′を発泡性プラスチツクよりな
る底部１a′とは音響インピーダンスを異にするプ
ラスチツク、セラミツク、金属等の材料で製した
ことにある。なお、振動ケース１′を底部１a′と
円筒側部１c′との分割面は、第２図の如く底部１
a′の内面と面一方向、または第３図の如く円筒側
部１c′の内周面と面一方向に、あるいは第４図の
如く底部１a′の内外面と側部１c′の内外周面との
交わり部分を結んだ斜め方向にそれぞれ設けるこ
とができ、両者を分割面にて重合した後、接着
剤、ビス、加締め等適当な接合手段を用いて一体
に固定する。 Next, FIGS. 2 to 4 each show an ultrasonic ceramic sensor according to the present invention, and the difference in structure from the prior art shown in FIG. (Sound wave transmitting/receiving part) Divided into 1a' and a cylindrical side part 1c', the bottom part 1a' is made of foamed plastic material similar to that explained in FIG. 1, and the cylindrical side part 1c' is made of foamed plastic material. The bottom part 1a' is made of a material such as plastic, ceramic, metal, etc., which has a different acoustic impedance. Note that the dividing plane of the vibration case 1' into the bottom part 1a' and the cylindrical side part 1c' is the bottom part 1 as shown in FIG.
a', or flush with the inner peripheral surface of the cylindrical side part 1c' as shown in FIG. They can be provided in diagonal directions connecting the intersections with the surfaces, and after they are superimposed at the split surface, they are fixed together using an appropriate joining means such as adhesive, screws, or crimping.
このように、振動ケース１′の円筒側部１c′の
音響インピーダンスが底部１a′のそれより大きく
なつていると、底部１a′の振動が円筒側部１c′と
の分割面において反射、分散され側部１c′に伝播
しないため、円筒側部１c′の残響振動をなくすこ
とができるのである。 In this way, when the acoustic impedance of the cylindrical side part 1c' of the vibration case 1' is larger than that of the bottom part 1a', the vibration of the bottom part 1a' is reflected and dispersed at the dividing plane with the cylindrical side part 1c'. Since the vibration does not propagate to the side portion 1c', reverberant vibrations on the cylindrical side portion 1c' can be eliminated.
因みに、振動ケース１全体を音響インピーダン
スが１×3000ｇ／cm2・secを有する発泡性プラス
チツク材料より製した第１図に示す先行技術によ
る超音波セラミツクセンサと、振動ケース１′の
底部１a′を前記と同じ発泡性プラスチツク材料
で、円筒側部１c′を音響インピーダンスが7.8×
5000ｇ／cm2・secを有するステンレス金属でそれ
ぞれ製した第２〜４図に示す本案の超音波セラミ
ツクセンサとについて送波パルス特性イ，ロを測
定した処、第５図に示したように本案の送波パル
ス特性ロは、先行技術のものに比べ残響（立下が
り）時間が一層短かく、1ms以下という極めて小
さくなつている成果からも本案構成による作用を
立証し得る。 Incidentally, the ultrasonic ceramic sensor according to the prior art shown in FIG. 1, in which the entire vibrating case 1 is made of a foamed plastic material having an acoustic impedance of 1 x 3000 g/cm 2 ·sec, and the bottom part 1a' of the vibrating case 1' are used. The cylindrical side part 1c' is made of the same foamed plastic material as above and has an acoustic impedance of 7.8×
The transmission pulse characteristics A and B were measured for the ultrasonic ceramic sensors of the present invention shown in Figs. 2 to 4, each made of stainless steel metal having a 5000 g/cm 2 sec, and the results of the present invention were as shown in Fig. The reverberation (falling) time of the transmitted wave pulse characteristic B is much shorter than that of the prior art, and the effect of the present configuration can be verified from the extremely small result of 1 ms or less.
本案の超音波セラミツクセンサは叙上の構成よ
りなり、特に振動ケースを底部と円筒側部とに分
割すると共に底部を発泡性プラスチツク材料で製
し、円筒側部を前記底部より音響インピーダンス
の大きい材料で製しすることによつて残響時間を
著しく短縮し得たものであるから、近接部の検知
や近接スイツチとして有効に役立つ。 The ultrasonic ceramic sensor of the present invention has the above-mentioned configuration, in particular, the vibration case is divided into a bottom part and a cylindrical side part, the bottom part is made of a foamed plastic material, and the cylindrical side part is made of a material with higher acoustic impedance than the bottom part. By making it possible to significantly shorten the reverberation time, it is useful for detecting nearby areas and as a proximity switch.
第１図は先行技術に係る超音波セラミツクセン
サを示し、Ａは一部切欠した平面図、Ｂは継断正
面図、第２図から第４図はそれぞれ本案の種々の
実施例に係るもので、第１図Ｂと同様の断面で示
した正面図、第５図は第１図に示す超音波セラミ
ツクセンサの送波パルス特性図イと本案に係る超
音波セラミツクセンサの送波パルス特性ロを示
す。なお、図中同一番号は同一部分を示す。
１′……振動ケース、１a′……底部、１c′……
円筒側部、２……圧電素子。
Fig. 1 shows an ultrasonic ceramic sensor according to the prior art, A is a partially cutaway plan view, B is a jointed front view, and Figs. 2 to 4 are each related to various embodiments of the present invention. , a front view shown in the same cross section as FIG. 1B, and FIG. show. Note that the same numbers in the figures indicate the same parts. 1'... Vibration case, 1a'... Bottom, 1c'...
Cylindrical side part, 2...piezoelectric element.
Claims (1)
としてその内面に圧電素子を貼着してなるものに
おいて、前記振動ケースを底部と円筒側部とに分
割すると共に底部を発泡性プラスチツク材料で製
し、円筒側部を前記底部より音響インピーダンス
の大きい材料で製したことを特徴とする超音波セ
ラミツクセンサ。 In the case where the bottom of a bottomed cylindrical vibration case is used as a sound wave transmitting and receiving section and a piezoelectric element is attached to the inner surface thereof, the vibration case is divided into a bottom and a cylindrical side, and the bottom is made of foamed plastic material. An ultrasonic ceramic sensor characterized in that the cylindrical side part is made of a material having a higher acoustic impedance than the bottom part.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5034784U JPS60163899U (en) | 1984-04-06 | 1984-04-06 | 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 |
|---|---|---|---|
| JP5034784U JPS60163899U (en) | 1984-04-06 | 1984-04-06 | Ultrasonic ceramic sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60163899U JPS60163899U (en) | 1985-10-31 |
| JPH0141279Y2 true JPH0141279Y2 (en) | 1989-12-06 |
Family
ID=30873627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5034784U Granted JPS60163899U (en) | 1984-02-21 | 1984-04-06 | Ultrasonic ceramic sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60163899U (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2651140B2 (en) * | 1986-07-16 | 1997-09-10 | 株式会社 村田製作所 | Aerial ultrasonic transducer |
| JPH0736639B2 (en) * | 1988-01-25 | 1995-04-19 | 株式会社村田製作所 | Airborne ultrasonic transducer |
| JP4432245B2 (en) * | 2000-06-02 | 2010-03-17 | パナソニック電工株式会社 | Ultrasonic transducer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2541492C3 (en) * | 1975-09-17 | 1980-10-09 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Ultrasonic transducer |
-
1984
- 1984-04-06 JP JP5034784U patent/JPS60163899U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60163899U (en) | 1985-10-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7692367B2 (en) | Ultrasonic transducer | |
| JPH09168194A (en) | Speaker | |
| JP3552605B2 (en) | Ultrasonic transducer | |
| JPS6133519B2 (en) | ||
| JPH0141279Y2 (en) | ||
| JP2002262383A (en) | Ultrasonic wave vibrator | |
| JP2001232294A (en) | Ultrasonic vibrator | |
| JPH055757Y2 (en) | ||
| JPH055756Y2 (en) | ||
| JP2001238292A (en) | Ultrasonic wave sensor | |
| JPS5924235Y2 (en) | ultrasonic probe | |
| JPH036960Y2 (en) | ||
| JP3528491B2 (en) | Ultrasonic transducer | |
| JPS63255681A (en) | Ultrasonic vibrator | |
| JP2002112395A (en) | Ultrasonic wave vibrator | |
| JPH0230960Y2 (en) | ||
| JPH0445353Y2 (en) | ||
| JPS59218098A (en) | Ultrasonic wave ceramic microphone | |
| JPH0112480Y2 (en) | ||
| JPS5843357Y2 (en) | Ultrasonic transducer | |
| JPS6025198Y2 (en) | ultrasonic ceramic microphone | |
| JPH0617439Y2 (en) | Ultrasonic Microphone | |
| JPH0241999Y2 (en) | ||
| JPH0427280Y2 (en) | ||
| JP2536451Y2 (en) | Ultrasonic transducer |