JPS6025959B2 - ultrasonic ceramic microphone - Google Patents
ultrasonic ceramic microphoneInfo
- Publication number
- JPS6025959B2 JPS6025959B2 JP10218384A JP10218384A JPS6025959B2 JP S6025959 B2 JPS6025959 B2 JP S6025959B2 JP 10218384 A JP10218384 A JP 10218384A JP 10218384 A JP10218384 A JP 10218384A JP S6025959 B2 JPS6025959 B2 JP S6025959B2
- Authority
- JP
- Japan
- Prior art keywords
- vibration
- plate
- vibrating
- microphone
- ultrasonic
- 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
- 239000000919 ceramic Substances 0.000 title claims description 19
- 239000002184 metal Substances 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 230000001629 suppression Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 210000001015 abdomen Anatomy 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement 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
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】
本発明は自動車用後方検知器など屋外用の超音波センサ
ーとして用いる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 The present invention relates to an ultrasonic ceramic microphone used as an outdoor ultrasonic sensor such as a rear detector for an automobile.
従釆のこの種のマイク。This kind of microphone is suitable for use.
ホンについて第１図とともに説明する。１は振動ケース
で、側部ｌａの厚みに比べ振動部ｌｂの厚みを薄く構成
して機械的インピーダンスの差位を設け、振動効率を改
善した構造を有する。The phone will be explained with reference to FIG. Reference numeral 1 denotes a vibration case, which has a structure in which the thickness of the vibration part lb is thinner than the thickness of the side part la to provide a difference in mechanical impedance and improve vibration efficiency.
２は圧電磁器振動子であり、この圧電磁器振動子２を振
動ケース１の振動部ｌｂに貼り合せ、振動ケース１の下
部の関孔部に端子板３を弾性接着剤４を介して固定して
いる。2 is a piezoelectric ceramic vibrator, and this piezoelectric ceramic vibrator 2 is bonded to the vibrating part lb of the vibrating case 1, and a terminal plate 3 is fixed to the lower part of the vibration hole part of the vibrating case 1 via an elastic adhesive 4. ing.
上記従釆の超音波セラミックマイクロホンにおいて、振
動ケース１は側部ｌａと振動部ｌｂを直角に構成し、こ
の側部ｌａと振動部ｌｂの厚み差を大きくとることによ
り、振動効率を上げようとしていた。しかし、このよう
な構成のみでは側部ｌａは振動部ｌｂとともに振動する
ため、振動部ｌｂの振動のヱネルギ−・は吸収され、前
面の振動部ｌｂから放射される音波の音圧は低下し、さ
らに振動ケース１の側部ｌａを支持することにより、イ
ンピーダンス特性が影響し、特性が変動しやすいもので
あった。また、振動ケース１は側部ｌａと振動部ｌｂの
厚み差を利用しているため、均一材料でのいまり加工が
できず、加工性が悪いものであった。本発明は以上の従
来の欠点を改良するものであり、高感度、広帯域の超音
波セラミックマイクロホンを提供するものである。In the above-described subordinate ultrasonic ceramic microphone, the vibration case 1 has the side part la and the vibration part lb arranged at right angles, and the thickness difference between the side part la and the vibration part lb is increased to increase the vibration efficiency. there was. However, with only such a configuration, the side portion la vibrates together with the vibrating portion lb, so the energy of the vibration of the vibrating portion lb is absorbed, and the sound pressure of the sound wave radiated from the front vibrating portion lb decreases. Furthermore, by supporting the side portion la of the vibration case 1, the impedance characteristics are affected and the characteristics tend to fluctuate. Furthermore, since the vibrating case 1 utilizes the difference in thickness between the side portion la and the vibrating portion lb, it is not possible to perform block machining using a uniform material, resulting in poor workability. The present invention improves the above-mentioned conventional drawbacks and provides a highly sensitive, broadband ultrasonic ceramic microphone.
本発明の一実施例について、第２図をもとにして説明す
る。An embodiment of the present invention will be described with reference to FIG.
５は金属製共振板で、均一な平面を有する振動部５ａの
外縁部に、振動抑制部５ｂを前記振動部５ａと一体に設
けられた構成である。Reference numeral 5 denotes a metal resonance plate, which has a structure in which a vibration suppressing part 5b is provided integrally with the vibrating part 5a at the outer edge of the vibrating part 5a having a uniform plane.
振動抑制部５ｂの断面は倭斜した波状の形状を有し、そ
の波状は２個以上の腹部を有している。また、金属製共
振板５はその振動部５ａの下面に圧電磁器振動子６が貼
り合せられ、複合共振子を構成する。７は筒状のケース
であり、金属製共振板５における振動抑制部５ｂの外縁
部をケース７の上部の開孔部に固定し、一定ケース７の
下部の開孔より、中央部に反射部８ａを有する端子板８
を挿入し、ケース７の下部の関孔を端子板７の底面で閉
塞する。The cross section of the vibration suppressing portion 5b has a sloping wavy shape, and the wavy shape has two or more abdomens. Furthermore, a piezoelectric ceramic vibrator 6 is bonded to the lower surface of the vibrating portion 5a of the metal resonant plate 5, thereby forming a composite resonator. 7 is a cylindrical case, the outer edge of the vibration suppressing part 5b of the metal resonance plate 5 is fixed to the opening in the upper part of the case 7, and the reflecting part is inserted in the center part through the opening in the lower part of the case 7. Terminal plate 8 with 8a
is inserted, and the lower part of the case 7 is closed with the bottom surface of the terminal plate 7.
さらに、この端子板８とケース８の隙間を弾性樹脂９に
よって密閉している。なお、前記金属製共振板６とケー
ス７を一体に構成することも可能で、一体に構成しても
本発明の目標とする性能が得られる。Furthermore, the gap between the terminal plate 8 and the case 8 is sealed with an elastic resin 9. Note that it is also possible to configure the metal resonance plate 6 and the case 7 in one piece, and even if they are configured in one piece, the performance targeted by the present invention can be obtained.
ここで、本発明の一実施例の寸法を次表に示す。表
ここで外径Ｄ，．Ｄ２、厚みｔ，，ら、角度８および間
隔Ａは第２図に示している。Here, the dimensions of one embodiment of the present invention are shown in the following table. Table where the outer diameter D, . D2, thickness t, , angle 8 and spacing A are shown in FIG.
なお、端子板８の反射部８ａと圧電磁器振動子６との間
隔Ａは定在波共振を得やすい位置に構成することがのぞ
ましい。Note that it is preferable that the distance A between the reflecting portion 8a of the terminal plate 8 and the piezoelectric ceramic vibrator 6 be configured at a position where standing wave resonance can be easily obtained.
計算では＾／４（＾は振動波の波長）以上の位置で定圧
波共振を得られるが、実際には、複合形の共振形状のた
め、実測により設定している。以上の構成によれば、金
属製共振板５により振動のエネルギーがケース７に吸収
されることを防止できる。In calculations, constant pressure wave resonance can be obtained at a position of ^/4 (^ is the wavelength of the vibration wave) or more, but in reality, it is set by actual measurement because the resonance shape is a composite type. According to the above configuration, vibration energy can be prevented from being absorbed by the case 7 by the metal resonance plate 5.
これは、金属製共振板５は、波状の振動抑制部５ｂにお
いてケース７の上端部に固定されているため、振動部５
ａの振動抑圧および振動部５ａからの振動漏れが緩和さ
れ、安定した振動を得ることができるためである。また
、金属製共振板５は中央の平面部よりなる振動部５ａと
、この振動部５ａの外縁部を波状の額斜ごせた曲部に変
形してなる振動抑制部５ｂとよりなっており、上記振動
部５ａを凹部の底面とした外広がりの形状をしているた
め、巣音効果を有し、音響変換効率を著しく向上させる
ことができる。また、圧電磁器振動板６と、端子板８に
設けた反射部８ａとの距離を適切に定め振動部５ａの音
響共振を得やすいようにしているため、高感度で、広帯
域を有する、密閉構造の超音波セラミックマイクロホン
を実現できる。以上のように、本発明の超音波セラミッ
クマイクロホンは、金属製共振板の外縁部に傾いた波状
の振動抑制部を設け、この振動抑制部を介して金属製共
振板を円筒状ケースに固定しているため、振動効率が向
上し、集音効果もすぐれたものとなり、さらに端子板に
金属製共振板との共振を得やすくする反射部を設けてい
るため高感度で、広帯域の特性を有するものとなる。This is because the metal resonance plate 5 is fixed to the upper end of the case 7 at the wavy vibration suppressing part 5b.
This is because vibration suppression of a and vibration leakage from the vibrating part 5a are alleviated, and stable vibration can be obtained. Further, the metal resonance plate 5 is composed of a vibrating part 5a made of a flat central part, and a vibration suppressing part 5b made by deforming the outer edge of this vibrating part 5a into a wavy, curved part. Since the vibrating portion 5a has an outwardly expanding shape with the bottom surface of the recess, it has a nesting sound effect and can significantly improve the acoustic conversion efficiency. In addition, since the distance between the piezoelectric ceramic diaphragm 6 and the reflecting section 8a provided on the terminal plate 8 is appropriately determined to facilitate acoustic resonance of the vibrating section 5a, the sealed structure has high sensitivity and a wide band. Ultrasonic ceramic microphone can be realized. As described above, in the ultrasonic ceramic microphone of the present invention, an inclined wavy vibration suppression part is provided on the outer edge of a metal resonance plate, and the metal resonance plate is fixed to a cylindrical case via this vibration suppression part. This improves vibration efficiency and provides excellent sound collection.Furthermore, the terminal board has a reflective part that facilitates resonance with the metal resonant plate, resulting in high sensitivity and broadband characteristics. Become something.
このような、超音波セラミックマイクロホンは自動車後
方検知器などに用いる超音波センサーとして有用なもの
であり、産業上の利用価値が大きい。Such an ultrasonic ceramic microphone is useful as an ultrasonic sensor used in a vehicle rear detector, etc., and has great industrial value.
第１図は従来の超音波セラミックマイクロホンの正面断
面図、第２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正面断面図である。
５・・・金属製共振板、５ａ・・・振動部、５ｂ・・・
振動抑制部、６・・・圧電磁器振動子、７・・・（節状
の）ケース、８…端子板、８ａ・・・反射部、９…弾性
樹脂。
第１図
第２図FIG. 1 is a front sectional view of a conventional ultrasonic ceramic microphone, and FIG. 2 is a front sectional view of an ultrasonic ceramic microphone according to an embodiment of the present invention. 5... Metal resonance plate, 5a... Vibration part, 5b...
Vibration suppressing part, 6... Piezoelectric ceramic vibrator, 7... (nodular) case, 8... Terminal plate, 8a... Reflecting part, 9... Elastic resin. Figure 1 Figure 2
Claims (1)
ように金属製共振板を固定し、この金属製共振板の中央
に形成された平面部よりなる振動部に圧電磁器振動子を
貼り合わせ、前記圧電磁器振動子と所定の間隔を保つ反
射部を設けた端子板により前記筒状ケースの他方の開孔
部を閉塞し、前記筒状ケースと端止間の隙間を弾性樹脂
で密閉してなる超音波セラミツクマイクロホンであつて
、前記金属製共振板の振動部の外縁部に傾斜した波状の
振動抑制部を形成し、上記金属製共振板を外広がりにな
るように変形してなる超音波セラミツクマイクロホン。1. A metal resonant plate is fixed to one of the openings of the cylindrical case so as to close the opening, and a piezoelectric ceramic vibrator is attached to the vibrating part consisting of a flat part formed in the center of the metal resonator plate. The other opening of the cylindrical case is closed by a terminal plate provided with a reflective part that maintains a predetermined distance from the piezoelectric ceramic vibrator, and the gap between the cylindrical case and the end stop is filled with an elastic resin. The ultrasonic ceramic microphone is formed by forming a slanted wavy vibration suppressing part on the outer edge of the vibrating part of the metal resonant plate, and deforming the metal resonator plate so as to expand outward. Ultrasonic ceramic microphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10218384A JPS6025959B2 (en) | 1984-05-21 | 1984-05-21 | ultrasonic ceramic microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10218384A JPS6025959B2 (en) | 1984-05-21 | 1984-05-21 | ultrasonic ceramic microphone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60200A JPS60200A (en) | 1985-01-05 |
| JPS6025959B2 true JPS6025959B2 (en) | 1985-06-21 |
Family
ID=14320554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10218384A Expired JPS6025959B2 (en) | 1984-05-21 | 1984-05-21 | ultrasonic ceramic microphone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6025959B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2800229B1 (en) * | 1999-10-22 | 2002-04-05 | Thomson Marconi Sonar Sas | BROADBAND SUBMARINE ACOUSTIC TRANSDUCER |
-
1984
- 1984-05-21 JP JP10218384A patent/JPS6025959B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60200A (en) | 1985-01-05 |
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