JPH0280965A - Acceleration sensor - Google Patents
Acceleration sensorInfo
- Publication number
- JPH0280965A JPH0280965A JP23261088A JP23261088A JPH0280965A JP H0280965 A JPH0280965 A JP H0280965A JP 23261088 A JP23261088 A JP 23261088A JP 23261088 A JP23261088 A JP 23261088A JP H0280965 A JPH0280965 A JP H0280965A
- Authority
- JP
- Japan
- Prior art keywords
- acceleration
- buzzer
- electrode part
- electrode
- detection electrode
- 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.)
- Granted
Links
- 230000001133 acceleration Effects 0.000 title claims abstract description 45
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 238000003745 diagnosis Methods 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract description 4
- 230000005856 abnormality Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 4
- 230000005284 excitation Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、車輌における各方向の加速度を検知し、各種
の動作１例えばサスベンジＪン、車高等を調整または作
動させるシステムに使用する加速度センサに関する。Detailed Description of the Invention (Field of Industrial Application) The present invention is an acceleration sensor used in a system that detects acceleration in each direction of a vehicle and adjusts or operates various operations such as suspension and vehicle height. Regarding.
（従来の技術）
従来、この種の装置は、第４図に示すように振動板と振
動板上に貼り合せた圧電素子で構成されている。圧電素
子上の電極は、加速度変換部分とセンサの故障を検知す
るためのブザ一部分とで形成されている。１．１’は加
速度検知電極部であり、２．２’はブザー電極部である
。３は電極のない絶縁部、４は振動板、５は組立時位置
決めするための孔、８は振動板４を中央部で支えるベー
スである。(Prior Art) Conventionally, this type of device is composed of a diaphragm and a piezoelectric element bonded to the diaphragm, as shown in FIG. The electrode on the piezoelectric element is formed of an acceleration conversion part and a buzzer part for detecting a sensor failure. 1.1' is an acceleration detection electrode part, and 2.2' is a buzzer electrode part. 3 is an insulating part without electrodes, 4 is a diaphragm, 5 is a hole for positioning during assembly, and 8 is a base that supports the diaphragm 4 at the center.
次に、上記従来例の動作について説明する。第４図にお
いて、検知装置の筐体に加速度が加わると、振動板４．
電極部１，１′を有する圧電素子９に応力が発生し、電
極部１，１′に電圧を発生する。その電圧は、加速度検
知電極部１，１′に接続された加速度信号取出しリード
線６を通じて外部に取り出される。Next, the operation of the above conventional example will be explained. In FIG. 4, when acceleration is applied to the housing of the detection device, the diaphragm 4.
Stress is generated in the piezoelectric element 9 having the electrode parts 1, 1', and a voltage is generated in the electrode parts 1, 1'. The voltage is extracted to the outside through an acceleration signal extraction lead wire 6 connected to the acceleration sensing electrode sections 1, 1'.
センサが故障した場合、すなわち加速度検知電極部１，
１′下の圧電素子９の故障、あるいはリード線６の断線
等によって加速度による電圧を誘起しない、あるいは誘
起しても極端に小さくなる場合が考えられる。そこで、
筐体外部から励振信号入力線７を通じてブザー電極部２
，２′に交流電圧を加えて圧電素子９に振動を発生させ
、その振動による発生電圧を加速度検知電極部１，１′
で測定して異常を知ることができる。If the sensor fails, that is, the acceleration sensing electrode section 1,
It is conceivable that due to failure of the piezoelectric element 9 below 1' or breakage of the lead wire 6, a voltage due to acceleration will not be induced, or even if it is induced, the voltage will be extremely small. Therefore,
The buzzer electrode section 2 is connected to the buzzer electrode section 2 through the excitation signal input line 7 from outside the housing.
, 2' to generate vibration in the piezoelectric element 9, and the voltage generated by the vibration is applied to the acceleration sensing electrode parts 1, 1'.
It is possible to detect abnormalities by measuring.
従って、従来の装置でも、電源起動時あるいは加速度モ
ニタ時に、ブザー電極部２，２′に交流電圧を加え、加
速度検知電極部１ｊ１′における交流信号の発生有無あ
るいは大小を測定することによって、加速度検知電極部
１，１′の故障を診断することができる。Therefore, even with conventional devices, acceleration can be detected by applying an AC voltage to the buzzer electrode sections 2, 2' at the time of power-up or acceleration monitoring, and measuring the presence or absence or magnitude of an AC signal at the acceleration detection electrode section 1j1'. Failures in the electrode sections 1, 1' can be diagnosed.
（発明が解決しようとする課題）
しかしながら、上記従来の故障診断用ブザー電極付き加
速度センサでは。(Problems to be Solved by the Invention) However, the above-mentioned conventional acceleration sensor with a buzzer electrode for fault diagnosis has problems.
（１）加速度感度が低い。(1) Low acceleration sensitivity.
（２）故障診断用ブザー出力が小さい。(2) The buzzer output for failure diagnosis is small.
（３）ハウジング内で圧電トランスデユーサ上部に回路
を組み込む際、電極からのリード端子の位置決めが必要
である。(3) When installing a circuit above the piezoelectric transducer within the housing, it is necessary to position the lead terminals from the electrodes.
（４）電極バタンか４箇所に分離されているため。(4) Because the electrode button is separated into four locations.
２箇所ず一つ接続配線しなければならない。You must connect and wire one at each two locations.
等の解決しなければならない問題があった。There were problems that needed to be solved.
（課題を解決するための手段）
本発明は上記問題を解決するために、圧電素子上のブザ
ー電極部、加速度検知電極部について、一方の電極の外
周を絶縁物を介して他方の相似形または相似形に近い電
極で囲んでものである。(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a buzzer electrode section and an acceleration detection electrode section on a piezoelectric element by connecting the outer periphery of one electrode to another similar shape or It is surrounded by electrodes with similar shapes.
（作 用）
本発明は上記のような構成により、次のような作用を有
する。(Function) With the above configuration, the present invention has the following effects.
（１）振動板に加速度が伝わると、振動板に接着された
圧電素子に応力が発生する。特に円板の中心部に大きく
発生する。その中心部を囲んで電極が配されているので
、効率よく電圧を取り出せる。(1) When acceleration is transmitted to the diaphragm, stress is generated in the piezoelectric element bonded to the diaphragm. It occurs particularly in the center of the disc. Since electrodes are placed around the center, voltage can be extracted efficiently.
（２）ブザー電極と加速度検知電極部とが全周で隣合っ
ているため、ブザー振動に無理がなく、かつ効率よく加
速度検知電極部に振動が伝わる。(2) Since the buzzer electrode and the acceleration sensing electrode section are adjacent to each other on the entire circumference, the buzzer vibration is natural and the vibration is efficiently transmitted to the acceleration sensing electrode section.
（３）組立時、振動板の向きがどの方向においても点対
称である。(3) During assembly, the orientation of the diaphragm is point symmetrical in any direction.
（４）２種類の電極がそれぞれ分割されることなく一体
となっており、構成が簡単である。(4) The two types of electrodes are integrated without being separated, and the configuration is simple.
（実施例）
第１図は本発明の第１の実施例を示し、（イ）は上面図
、（ロ）は側断面図である。１は加速度検知電極部、２
はブザー電極部であり、振動板４に貼り合せた圧電素子
９の上にある。(Embodiment) FIG. 1 shows a first embodiment of the present invention, in which (A) is a top view and (B) is a side sectional view. 1 is an acceleration detection electrode part, 2
is a buzzer electrode section, which is located on the piezoelectric element 9 bonded to the diaphragm 4.
ハウジングに伝わった加速度は振動板４の応力となり、
従って、加速度検知電極部１に電圧を発生する。その電
圧は、リード線６を通して外部あるいはハウジング内に
ある回路へ人力される。ブザー電極部２は加速度検知電
極部１の外周に配されており、必要時にブザー電極部２
から振動を発生して、加速度検知電極部１の受信信号の
大小によって加速度検知電極部１の異常を診断すること
ができる。The acceleration transmitted to the housing becomes stress on the diaphragm 4,
Therefore, a voltage is generated in the acceleration sensing electrode section 1. The voltage is applied through leads 6 to a circuit externally or within the housing. The buzzer electrode section 2 is arranged on the outer periphery of the acceleration detection electrode section 1, and the buzzer electrode section 2 is placed on the outer periphery of the acceleration detection electrode section 1.
It is possible to diagnose an abnormality in the acceleration sensing electrode section 1 based on the magnitude of the signal received by the acceleration sensing electrode section 1 by generating vibrations.
このように上記実施例によれば、加速度検知電極部１と
ブザー電極部２が同心円上に配されているため、加速度
電圧感度がよく、ブザー出力も大きい。As described above, according to the above embodiment, since the acceleration detection electrode section 1 and the buzzer electrode section 2 are arranged concentrically, the acceleration voltage sensitivity is good and the buzzer output is large.
また、ハウジング内における振動板と圧電素子電極部に
方向性を生じないので組立てやすい、また、各電極は部
分的に分離する必要がないため。Furthermore, since there is no directionality between the diaphragm and the piezoelectric element electrode within the housing, assembly is easy, and each electrode does not need to be partially separated.
接続点が減り、信頼性が向上する。Reduced connection points and improved reliability.
第２．第３の実施例として、第２図の２つの電極が多角
形の例、第３図は２つの電極が凹凸で隣接している例で
ある。これも上記と同様の効果を有する。Second. As a third embodiment, FIG. 2 shows an example in which the two electrodes are polygonal, and FIG. 3 shows an example in which the two electrodes are uneven and adjacent to each other. This also has the same effect as above.
なお、第１図、第２図、第１１図の例では、内側に加速
度検知電極部を配しているが、これを逆に、すなわちブ
ザー電極部の外周にもってきてもほぼ同様の効果が得ら
れることは容易に推定できる。In the examples shown in Figs. 1, 2, and 11, the acceleration sensing electrode section is arranged on the inside, but almost the same effect can be obtained even if it is placed in the opposite direction, that is, on the outer periphery of the buzzer electrode section. It can be easily estimated that .
（発明の効果）
上記実施例の説明中に既に記載した如く、加速度検知電
極部とブザー電極部の２つの電極において、一方の電極
を他方の電極の外周に絶縁部を挟んで相似形または相似
形に近く配することにより、加速度電圧感度がよく、ブ
ザー出力も大きくなる。(Effects of the Invention) As already described in the description of the above embodiments, the two electrodes, the acceleration detection electrode part and the buzzer electrode part, are similar or similar in shape by sandwiching an insulating part between one electrode and the other electrode. By arranging it close to the shape, the acceleration voltage sensitivity is good and the buzzer output is also large.
また、ハウジング内における振動板と圧電素子電極部に
方向性を生じないため１組立てが容易である。Further, since there is no directionality between the diaphragm and the piezoelectric element electrode within the housing, assembly is easy.
また、各電極は部分的に分離接続する必要がないため、
接続点が減り、信頼性が向上する。In addition, since each electrode does not need to be partially separated and connected,
Reduced connection points and increased reliability.
第１図は本発明の第１の実施例における圧電素子部およ
び振動板の概略図で、（イ）は上面図、（ロ）は側断面
図を示す。第２図、第３図はそれぞれ本発明の第２．第
３の実施例の上面図を示す。
第４図は従来の加速度検知電極部およびブザー電極部を
示し、（イ）は上面図、（ロ）は側断面図を示す５
１．１′・・・加速度検知電極部、 ２．２′・・・
ブザー電極部、 ３・・・絶縁部、 ４・・・振動板、
５・・・位置決め孔、 ６・・・加速度信号取出しリ
ード線、 ７・・・励振信号入力線、８・・・ベース
、 ９・・・圧電素子。
特許出願人 松下電器産業株式会社
第
図
８Ａ（−八
（、（）
２′７７−電伸茄
（ロ）FIG. 1 is a schematic view of a piezoelectric element section and a diaphragm in a first embodiment of the present invention, in which (a) shows a top view and (b) shows a side sectional view. FIGS. 2 and 3 respectively show the second embodiment of the present invention. A top view of a third embodiment is shown. FIG. 4 shows a conventional acceleration sensing electrode section and a buzzer electrode section, where (a) is a top view and (b) is a side sectional view.5 1.1'...Acceleration sensing electrode section, 2.2' ...
Buzzer electrode part, 3... Insulation part, 4... Vibration plate,
5... Positioning hole, 6... Acceleration signal extraction lead wire, 7... Excitation signal input line, 8... Base, 9... Piezoelectric element. Patent applicant: Matsushita Electric Industrial Co., Ltd.
Claims (1)
動子を有する圧電ディスク中心固定型の加速度センサに
おいて、ブザーによる故障診断用電極と加速度検知用電
極とが絶縁部を挟んで隣接しており、一方の電極が他方
の電極の外周を相似形または相似形に近く囲んでいるこ
とを特徴とする加速度センサ。In a piezoelectric disk center-fixed acceleration sensor that has a combination vibrator of a disk-shaped piezoelectric ceramic and a metal diaphragm, an electrode for fault diagnosis using a buzzer and an electrode for acceleration detection are adjacent to each other with an insulating section in between, and one An acceleration sensor characterized in that an electrode surrounds the outer periphery of another electrode in a similar shape or in a nearly similar shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63232610A JPH0769348B2 (en) | 1988-09-19 | 1988-09-19 | Acceleration sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63232610A JPH0769348B2 (en) | 1988-09-19 | 1988-09-19 | Acceleration sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0280965A true JPH0280965A (en) | 1990-03-22 |
| JPH0769348B2 JPH0769348B2 (en) | 1995-07-26 |
Family
ID=16942045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63232610A Expired - Fee Related JPH0769348B2 (en) | 1988-09-19 | 1988-09-19 | Acceleration sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0769348B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5153476A (en) * | 1991-03-11 | 1992-10-06 | The United States Of America As Represented By The Secretary Of The Army | Acoustic vibrator with variable sensitivity to external acceleration |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63241467A (en) * | 1987-03-30 | 1988-10-06 | Honda Motor Co Ltd | Collision detector for vehicle |
| JPH01102372A (en) * | 1987-10-16 | 1989-04-20 | Honda Motor Co Ltd | Piezoelectric type acceleration sensor |
-
1988
- 1988-09-19 JP JP63232610A patent/JPH0769348B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63241467A (en) * | 1987-03-30 | 1988-10-06 | Honda Motor Co Ltd | Collision detector for vehicle |
| JPH01102372A (en) * | 1987-10-16 | 1989-04-20 | Honda Motor Co Ltd | Piezoelectric type acceleration sensor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5153476A (en) * | 1991-03-11 | 1992-10-06 | The United States Of America As Represented By The Secretary Of The Army | Acoustic vibrator with variable sensitivity to external acceleration |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0769348B2 (en) | 1995-07-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |