JPS59188298A - Ultrasonic ceramic microphone - Google Patents
Ultrasonic ceramic microphoneInfo
- Publication number
- JPS59188298A JPS59188298A JP4954784A JP4954784A JPS59188298A JP S59188298 A JPS59188298 A JP S59188298A JP 4954784 A JP4954784 A JP 4954784A JP 4954784 A JP4954784 A JP 4954784A JP S59188298 A JPS59188298 A JP S59188298A
- Authority
- JP
- Japan
- Prior art keywords
- case
- terminal plate
- elastic body
- opening
- terminals
- 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.)
- Pending
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000035945 sensitivity 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)
- Transducers For Ultrasonic Waves (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は自動車の後方検知装置やパーキングメータに使
用する屋外用の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 outdoor ultrasonic ceramic microphone used in an automobile rear detection device or a parking meter.
従来のこの種のマイクロホンは第１図で示すように、切
削加工によって作られたアルミケース１の底面内側面の
中央部に圧電磁器振動子２を貼り合せたもので、前記ア
ルミケース１の底面厚みと側部厚みは、振動減衰効果を
上げるために、側部厚みを底面厚みに比べて２位以上の
厚みに設定している。３は端子板で、前記ケース１の開
口部に弾性接着剤４を介して取付けられて構成されてい
るものであった。この場合、ケース１底面に圧電磁器振
動子２を貼り合せだバイモルフ振動部１ａを一体に構成
しているだめ、ケース１の側部と振動部（底面）の厚み
差による振動減衰対策では、完全に側部への伝達をしゃ
断できない。このためケース１の保持の仕方によって振
動部１ａの共振特性の変動が大きくなる。また、前記ア
ルミケース１の形状が大きく、振動部１ａへの負荷が大
きくなると同時にアルミケース１の振動Ｑｍが高くなる
ため、感度−周波数特性の共振特性が鋭く狭帯域になる
。すなわち、回路への組み込みが非常に難しくなる。以
上の問題点が従来の超音波セラミックマイクロホンには
あった。As shown in FIG. 1, this type of conventional microphone has a piezoelectric ceramic vibrator 2 bonded to the center of the inner bottom surface of an aluminum case 1 made by cutting. Regarding the thickness and side thickness, in order to increase the vibration damping effect, the side thickness is set to be at least second in thickness compared to the bottom thickness. Reference numeral 3 denotes a terminal plate, which is attached to the opening of the case 1 via an elastic adhesive 4. In this case, since the piezoelectric ceramic vibrator 2 is bonded to the bottom of the case 1 and the bimorph vibrating part 1a is integrally constructed, the vibration damping measures due to the difference in thickness between the side part of the case 1 and the vibrating part (bottom) cannot be used completely. transmission to the sides cannot be cut off. Therefore, depending on how the case 1 is held, the resonance characteristics of the vibrating portion 1a vary greatly. Further, since the shape of the aluminum case 1 is large and the load on the vibrating portion 1a becomes large, the vibration Qm of the aluminum case 1 becomes high at the same time, so that the resonance characteristic of the sensitivity-frequency characteristic becomes sharp and narrow band. In other words, it becomes extremely difficult to incorporate it into a circuit. Conventional ultrasonic ceramic microphones have the above problems.
本発明は、従来の問題点である、セットへの組み込み（
取付け）による特性変化を少なくし、安定した感度−周
波数特性を有する超音波セラミックマイクロホンを提供
しようとするものである。The present invention solves the conventional problem of incorporating into a set (
The present invention aims to provide an ultrasonic ceramic microphone having stable sensitivity-frequency characteristics by reducing changes in characteristics due to installation.
本発明の一実施例を第２図で示す構造図とともに説明す
る。An embodiment of the present invention will be described with reference to the structural diagram shown in FIG.
６は金属製ケースで、側部と底面を有し、それぞれの厚
みは同じで一体に構成されている。６は圧電磁器振動子
で、前記ケース６の底面内側面の中央部に貼り合せられ
ており、また前記ケース５の他端開口部には端子板７が
弾性接着剤８を介して取付けられている。ここで、ケー
ス５の厚み全一定にしているため、小型で軽量な振動部
を構成できる。例えば４０ＫＨｚマイクロホンの形状寸
法について従来品と比較すると下表のようになる。Reference numeral 6 denotes a metal case, which has side parts and a bottom face, each having the same thickness and being constructed integrally. Reference numeral 6 denotes a piezoelectric ceramic vibrator, which is bonded to the center of the inner bottom surface of the case 6, and a terminal plate 7 is attached to the opening at the other end of the case 5 via an elastic adhesive 8. There is. Here, since the thickness of the case 5 is kept constant, a small and lightweight vibrating section can be constructed. For example, the shape and dimensions of a 40KHz microphone are compared with conventional products as shown in the table below.
捷だ、９は弾性体で底面と側部を有し、底面に前記端子
板７に植設した端子１０＆、１０ｂ−ｉ通す穴を有して
おり、前記端子板７の底面とケース５−（７）ＩＩ！＠
に覆うように密着されている。次に、金属製（あるいは
樹脂製）外ケース１１を前記弾性体９の外周に密接させ
て挿入している。前記外ケース１１の底面部には、前記
端子１０ａ、１０ｂを通す穴１１ａ、１１ｂが設けられ
ている。さらに、前記金属製外ケース１１の開口部をカ
ールさせて、前記弾性体９を介して前記ケース５を保持
して全体が構成されている。また １２２Ｌ及び１２ｂ
はリード線である。The handle 9 is an elastic body having a bottom face and side parts, and has a hole on the bottom face through which the terminals 10 & 10b-i implanted in the terminal board 7 pass, and the bottom face of the terminal board 7 and the case 5- (7) II! @
It is tightly attached so as to cover it. Next, a metal (or resin) outer case 11 is inserted in close contact with the outer periphery of the elastic body 9. The bottom surface of the outer case 11 is provided with holes 11a and 11b through which the terminals 10a and 10b are passed. Further, the opening of the metal outer case 11 is curled and the case 5 is held via the elastic body 9 to form the entire structure. Also 122L and 12b
is the lead wire.
以上本発明によれば、振動部の形状が小形軽量で構成さ
れるため、振動部への負荷質量が小さく、ケース５の振
動部（底面）の厚みを薄くできるため、振動の共振Ｑが
従来品に比べ小さい。しノ、っ：って、感度−周波数特
性が第３図に示すように広帯域・高感度を示すものとな
る。第３図でＡは本発明品の特性、Ｂは従来品の特性で
ある。さらに、振動部合有するケース６の固定を弾性体
を介して端子板γと外ケース１１間に取付けているため
、外部振動による雑音を弾性体９で緩衝させ、ケース５
の振動が外部取付部へ伝わることによる振動減衰を前記
弾性体９で吸収する構造になっているため、感度−周波
数特性およびインピーダンス特性の変動を極度に押え安
定した性能を有する超音波セラミックマイクロホンを供
給することができる。As described above, according to the present invention, since the shape of the vibrating part is small and lightweight, the load mass on the vibrating part is small, and the thickness of the vibrating part (bottom surface) of the case 5 can be made thinner, so that the resonance Q of the vibration is lower than that of the conventional one. Smaller than the product. Wow, the sensitivity-frequency characteristics show a wide band and high sensitivity as shown in Figure 3. In FIG. 3, A is the characteristic of the product of the present invention, and B is the characteristic of the conventional product. Furthermore, since the case 6 that joins the vibrating part is fixed between the terminal plate γ and the outer case 11 via an elastic body, noise caused by external vibration is buffered by the elastic body 9, and the case 6
The structure is such that the elastic body 9 absorbs the vibration attenuation caused by the vibration transmitted to the external mounting part, so that the ultrasonic ceramic microphone has stable performance by minimizing fluctuations in sensitivity-frequency characteristics and impedance characteristics. can be supplied.
本発明によれば、自動車、複写機等の信頼性を最も重要
とする装置への応用を可能とし、ユニット−＼の取付け
を容易とさせることができるものである。According to the present invention, it is possible to apply it to devices such as automobiles and copying machines where reliability is of the utmost importance, and the unit can be easily installed.
第１図は従来の超音波セラミックマイクロホンの断面図
、第２図は本発明にかかる超音波セラミを示す図である
。
５・・・・・・ケース、６・・・・・・圧電磁器振動子
、了 ・・・端子板、９・・・・・弾性体、１１・・・
・・・外ケース。
第１図
／ａ
ｊ（／ｂ
第３図
＠波数FIG. 1 is a sectional view of a conventional ultrasonic ceramic microphone, and FIG. 2 is a diagram showing an ultrasonic ceramic according to the present invention. 5...Case, 6...Piezoelectric ceramic vibrator, Terminal plate, 9...Elastic body, 11...
...outer case. Figure 1/a j(/b Figure 3 @ wave number
Claims (1)
器振動子を貼シ合せ、前記ケースの開口部に端子板を取
付け、前記端子板と前記ケース側面周辺を弾性体で覆い
、さらに前記弾性体の外周を金属もしくは樹脂製の外ケ
ースで覆ってなる超音波セラミックマイクロホン。A piezoelectric ceramic vibrator is bonded to the center of the inner bottom surface of a case with one end open, a terminal plate is attached to the opening of the case, the terminal plate and the periphery of the side surface of the case are covered with an elastic body, and An ultrasonic ceramic microphone that consists of an elastic body covered with an outer case made of metal or resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4954784A JPS59188298A (en) | 1984-03-14 | 1984-03-14 | Ultrasonic ceramic microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4954784A JPS59188298A (en) | 1984-03-14 | 1984-03-14 | Ultrasonic ceramic microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59188298A true JPS59188298A (en) | 1984-10-25 |
Family
ID=12834217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4954784A Pending JPS59188298A (en) | 1984-03-14 | 1984-03-14 | Ultrasonic ceramic microphone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59188298A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000079513A1 (en) * | 1999-06-18 | 2000-12-28 | Fraunhofer Gesellschaft zur Förderung der angewandten Forschung e.V. | Dampening holding device for the housing of an ultrasonic transducer and method of its production |
| US7246523B2 (en) * | 2004-08-11 | 2007-07-24 | Denso Corporation | Ultrasonic sensor |
-
1984
- 1984-03-14 JP JP4954784A patent/JPS59188298A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000079513A1 (en) * | 1999-06-18 | 2000-12-28 | Fraunhofer Gesellschaft zur Förderung der angewandten Forschung e.V. | Dampening holding device for the housing of an ultrasonic transducer and method of its production |
| US7246523B2 (en) * | 2004-08-11 | 2007-07-24 | Denso Corporation | Ultrasonic sensor |
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