JPH036464B2 - - Google Patents
Info
- Publication number
- JPH036464B2 JPH036464B2 JP10811984A JP10811984A JPH036464B2 JP H036464 B2 JPH036464 B2 JP H036464B2 JP 10811984 A JP10811984 A JP 10811984A JP 10811984 A JP10811984 A JP 10811984A JP H036464 B2 JPH036464 B2 JP H036464B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic fluid
- container
- capacitors
- electrode
- generating means
- 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
- 239000011553 magnetic fluid Substances 0.000 claims description 28
- 230000001133 acceleration Effects 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 claims description 18
- 230000005389 magnetism Effects 0.000 claims description 16
- 230000005484 gravity Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 description 4
- 238000005192 partition Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/125—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by capacitive pick-up
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
- Fluid-Damping Devices (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、自動車等移動体の加速度を検出す
るセンサに関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a sensor for detecting acceleration of a moving body such as an automobile.
（従来の技術）
従来、加速度センサとして、例えば実開昭58−
27772号公報に示されているように、ハウジング
内で可動鉄心をばね等から成る機械的支持機構を
介して支持し、この可動鉄心が慣性力を受けて変
位する量を差動トランスで検出することが公知と
なつている。しかしながら、かかる加速度センサ
においては、前記電極鉄心を機械的支持機構によ
り支持しているので、その機構部が複雑で損傷し
やすく、加速度センサの信頼性を阻害するという
欠点があつた。(Prior art) Conventionally, as an acceleration sensor, for example,
As shown in Publication No. 27772, a movable core is supported within a housing via a mechanical support mechanism consisting of a spring, etc., and a differential transformer is used to detect the amount of displacement of this movable core due to inertial force. It has become publicly known. However, in such an acceleration sensor, since the electrode core is supported by a mechanical support mechanism, the mechanism is complicated and easily damaged, which impairs the reliability of the acceleration sensor.
（発明の課題）
そこで、この発明は、上述したように磁性体た
る可動鉄心を支持する機構部が複雑であることに
起因する従来の欠点を解消し、信頼性が高い加速
度センサを提供することを課題とする。(Problems to be solved by the invention) Therefore, as described above, it is an object of the present invention to provide a highly reliable acceleration sensor that eliminates the conventional drawbacks caused by the complexity of the mechanical part that supports the movable iron core, which is a magnetic material. The task is to
（課題を達成するための手段）
而して、その要旨とするところは、容器内に配
された１つの電極と、この電極に対向して前記容
器の周囲に並設された２つの電極とにより２つの
コンデンサを構成し、前記容器には磁性流体及び
該磁性流体と混合せず且つ比重の異なる媒体を封
入し、前記容器の周囲には前記磁性流体に一定の
磁気を与えて該磁性流体を筒状に保持する定磁気
発生手段を設け、更に前記２つのコンデンサの静
電容量の変化を検出する検出手段を具備すること
を特徴とする加速度センサにある。(Means for Achieving the Object) The gist is that one electrode is arranged inside a container, and two electrodes are arranged in parallel around the container in opposition to this electrode. constitutes two capacitors, the container is filled with a magnetic fluid and a medium that does not mix with the magnetic fluid and has a different specific gravity, and around the container, a certain magnetism is applied to the magnetic fluid to increase the magnetic fluid. The acceleration sensor is characterized in that it is provided with a constant magnetism generating means for holding the capacitor in a cylindrical shape, and further comprises a detecting means for detecting a change in the capacitance of the two capacitors.
（課題の達成）
従つて、磁性流体の位置変化によつて生ずるコ
ンデンサの容量変化に応じて加速度を測定できる
ので、構成が簡素になり、このため上記課題を達
成できるものである。(Achievement of the Problem) Therefore, since the acceleration can be measured according to the capacitance change of the capacitor caused by the change in the position of the magnetic fluid, the configuration becomes simple, and therefore the above-mentioned problem can be achieved.
（実施例）
以下、この発明の実施例を図面により説明す
る。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
図にはこの発明に係る実施例が示され、加速度
センサはコンデンサ１ａ，１ｂを構成する電極
２，３ａ，３ｂを有し、電極２は円柱状導体から
成りハウジング４の中央部に配され、電極３ａ，
３ｂは中空部を有する円筒状導体から成り前記電
極２を中心とする同心円上に配置されている。そ
して、前記電極２，３ａはコンデンサ１ａを、前
記電極２，３ｂはコンデンサ１ｂをそれぞれ構成
している。 The figure shows an embodiment according to the present invention, in which the acceleration sensor has electrodes 2, 3a and 3b that constitute capacitors 1a and 1b, electrode 2 is made of a cylindrical conductor and is arranged in the center of housing 4, electrode 3a,
3b is a cylindrical conductor having a hollow portion, and is arranged on a concentric circle with the electrode 2 at the center. The electrodes 2 and 3a constitute a capacitor 1a, and the electrodes 2 and 3b constitute a capacitor 1b.
前記電極３ａ，３ｂと電極２との間には、前記
電極２がその中空部に配設されている容器５が設
けられている。該容器５はそれぞれ非磁性材から
成る本体部５ａ及び蓋体部５ｂから構成され、内
部には磁性流体６と媒体７とが封入されている。 A container 5 is provided between the electrodes 3a, 3b and the electrode 2, and the container 5 has the electrode 2 disposed in its hollow part. The container 5 is composed of a main body part 5a and a lid part 5b, each made of a non-magnetic material, and a magnetic fluid 6 and a medium 7 are sealed inside.
前記磁性流体６は、例えば直径が100Å程度の
磁性体粒子Fe3O4を水や油等の種々の溶媒中に高
濃度で分散させたコロイド状の液体で、磁場を作
用させても磁性体粒子の沈降や凝集が起こらず、
見かけ上液体自身が磁性をもつているように振る
舞うものである。 The magnetic fluid 6 is a colloidal liquid in which magnetic particles Fe 3 O 4 with a diameter of about 100 Å are dispersed at a high concentration in various solvents such as water and oil, and even when a magnetic field is applied, the magnetic fluid 6 is a colloidal liquid. No sedimentation or agglomeration of particles occurs,
The liquid appears to behave as if it were magnetic.
また、媒体７は、例えば水等の液体又は窒素ガ
ス、アルゴンその他の不活性ガス、空気等の気体
で、前記磁性流体６と混じらず且つ磁性流体６と
比重が異なるもので、この比重の大小に応じて加
速度センサの感度を調整することができ、比重が
小さい程感度を上げることができる。そして、こ
の磁性流体６と媒体７とは所定の比率（例えば１
対５）に設定されている。 The medium 7 is, for example, a liquid such as water, a gas such as nitrogen gas, argon or other inert gas, or air, which does not mix with the magnetic fluid 6 and has a different specific gravity from the magnetic fluid 6. The sensitivity of the acceleration sensor can be adjusted according to the specific gravity, and the sensitivity can be increased as the specific gravity is smaller. The magnetic fluid 6 and the medium 7 are mixed at a predetermined ratio (for example, 1
vs. 5).
また、これらの容器５、磁性流体６及び媒体７
は前記コンデンサ１ａ，１ｂの誘電体として作用
し、特に前記磁性流体６は移動してコンデンサ１
ａ，１ｂの該磁性流体６の含有量を変化させるの
で、前記コンデンサ１ａ，１ｂの静電容量は前記
磁性流体６の移動量に対応して変化する。 In addition, these containers 5, magnetic fluid 6 and medium 7
acts as a dielectric for the capacitors 1a and 1b, and in particular, the magnetic fluid 6 moves to form the capacitor 1.
Since the content of the magnetic fluid 6 in the capacitors 1a and 1b is changed, the capacitance of the capacitors 1a and 1b changes in accordance with the amount of movement of the magnetic fluid 6.
前記電極３ａ，３ｂの外周面とハウジング４の
内周面との間には定磁気発生手段８が設けられ、
この定磁気発生手段８は、この実施例では永久磁
石から構成され、この永久磁石が前記外周面及び
内周面に当接して固定されている。而して、この
定磁気発生手段８により前記容器５内の磁性流体
６に磁気が与えられ、該磁性流体６は、容器５内
の中心に集まると共に、筒状となつてその中心部
には通路９が形成されるようになる。尚、この定
磁気発生手段８は還状永久磁石の他に電磁石であ
つてもよい。そして、前記還状永久磁石の一端と
前記ハウジング４の底部との間に形成される空間
にはスペイサ１０ａが、前記定磁気発生手段８の
他端と後述する仕切板１１との間に形成される空
間にはスペイサ１０ｂがそれぞれ挿入されてい
る。 A constant magnetism generating means 8 is provided between the outer peripheral surface of the electrodes 3a, 3b and the inner peripheral surface of the housing 4,
In this embodiment, the constant magnetism generating means 8 is composed of a permanent magnet, and the permanent magnet is fixed in contact with the outer circumferential surface and the inner circumferential surface. The constant magnetism generating means 8 applies magnetism to the magnetic fluid 6 in the container 5, and the magnetic fluid 6 gathers at the center of the container 5, becomes cylindrical, and has a cylindrical shape at its center. A passage 9 is now formed. Note that this constant magnetism generating means 8 may be an electromagnet in addition to the circular permanent magnet. In a space formed between one end of the circular permanent magnet and the bottom of the housing 4, a spacer 10a is formed between the other end of the constant magnetism generating means 8 and a partition plate 11, which will be described later. A spacer 10b is inserted into each space.
前記仕切板１１は、ハウジング４内を二分し、
前記電極２，３ａ，３ｂ、容器５、定磁気発生手
段８等の押えとして作用するよう前記容器の蓋体
部５ｂに当接して該ハウジング４内に設けられて
いる。そして、その一部には、前記電極２，３
ａ，３ｂに接続される配線１２を通すための貫通
孔１３が設けられている。一方、前記仕切板１１
によつて二分されたハウジング４内の間には、コ
ンデンサ１ａ，１ｂの静容量変化の検出及び増幅
等を行なうための電子回路部１４が設けられてい
る。また、ハウジング４の開口部の端部には複数
の爪１５が設けられ、蓋体１６がかしめ付けられ
ており、この蓋体１６にはコネクタ１７が取付け
られ、該コネクタ１７を介して前記電子回路部１
４の信号線１８が外部に引き出されて、コントロ
ールユニツツト１９に接続されている。該コント
ロールユニト１９は、例えば入力信号をデジタル
信号に変換してこの後に接続される表示回路２０
に出力するもので、該表示回路２０においては、
例えば数値表示が行なわれるようになつている。 The partition plate 11 divides the inside of the housing 4 into two,
It is provided in the housing 4 in contact with the lid portion 5b of the container so as to act as a presser for the electrodes 2, 3a, 3b, the container 5, the constant magnetism generating means 8, etc. In a part of the electrodes 2 and 3,
A through hole 13 is provided for passing the wiring 12 connected to the terminals a and 3b. On the other hand, the partition plate 11
An electronic circuit section 14 for detecting and amplifying changes in capacitance of the capacitors 1a and 1b is provided between the inside of the housing 4, which is divided into two by the arrow. Further, a plurality of claws 15 are provided at the end of the opening of the housing 4, and a lid body 16 is caulked to the housing 4. A connector 17 is attached to the lid body 16. Circuit section 1
Four signal lines 18 are led out and connected to a control unit 19. The control unit 19 converts an input signal into a digital signal, and connects the display circuit 20 to a digital signal.
In the display circuit 20,
For example, numerical values are now displayed.
上記構成において、加速されていない場合に
は、磁性流体６は定磁気発生手段８によつて形成
される磁界を中心として集まるので、コンデンサ
１ａ，１ｂの静電容量は変化せず所定の値が検出
され、表示器２０には加速が０であることが示さ
れる。そして、左右いずれか一方に加速される
と、磁性流体６がその加速方向とは逆の方向へ慣
性力を受けるので、媒体７が通路９を介して一方
から他方へ逃げながら、前記磁性流体６は定磁気
発生手段８の磁気により受ける磁力に抗して変位
する。これにより、前記コンデンサ１ａ，１ｂの
静電容量が変化し、電子回路部１４によつて加速
度に対応した静電容量が検出され、コントロール
ユニツト１９を介して表示器２０に加速度が表示
される。 In the above configuration, when not accelerated, the magnetic fluid 6 gathers around the magnetic field formed by the constant magnetism generating means 8, so the capacitances of the capacitors 1a and 1b do not change and remain at a predetermined value. The acceleration is detected and the display 20 shows that the acceleration is zero. When the magnetic fluid 6 is accelerated in either the left or right direction, the magnetic fluid 6 receives an inertial force in the direction opposite to the acceleration direction. is displaced against the magnetic force received by the magnetism of the constant magnetism generating means 8. As a result, the capacitance of the capacitors 1a and 1b changes, the electronic circuit section 14 detects the capacitance corresponding to the acceleration, and the control unit 19 displays the acceleration on the display 20.
（発明の効果）
以上述べたように、この発明によれば、磁性流
体を用いて検出部分における機械的な支持機構を
不要にしたので、故障を少なくして信頼性を向上
させることができる。また、磁性流体は定磁気発
生手段により筒状となるようにしたので、媒体の
逃げがよく、感度を向上させることができる。さ
らに、上述したように機械的な支持機構を不要に
し、検出部がコンデンサから成るので、小型、軽
量とすることができ、構造も簡単であるから安価
なものとすることができる等の効果を奏するもの
である。尚、上記加速度センサを傾むかせると、
磁性流体に重力加速度が作用し、コンデンサの容
量が変化するので、加速度センサを設置している
装置の傾斜角を測定することが可能となる。(Effects of the Invention) As described above, according to the present invention, since the magnetic fluid is used to eliminate the need for a mechanical support mechanism in the detection portion, it is possible to reduce failures and improve reliability. In addition, since the magnetic fluid is made into a cylindrical shape by the constant magnetism generating means, the medium can easily escape and the sensitivity can be improved. Furthermore, as mentioned above, there is no need for a mechanical support mechanism, and since the detection part consists of a capacitor, it can be made smaller and lighter, and the structure is simple, so it can be made at a lower cost. It is something to play. Furthermore, if the above acceleration sensor is tilted,
Since gravitational acceleration acts on the magnetic fluid and the capacitance of the capacitor changes, it becomes possible to measure the tilt angle of the device in which the acceleration sensor is installed.
図はこの発明に係る実施例を示す断面図であ
る。
２……電極、３ａ，３ｂ……電極、５……容
器、６……磁性流体、７……媒体、８……定磁気
発生手段。
The figure is a sectional view showing an embodiment according to the present invention. 2... Electrode, 3a, 3b... Electrode, 5... Container, 6... Magnetic fluid, 7... Medium, 8... Constant magnetism generating means.
Claims (1)
対向して前記容器の周囲に並設された２つの電極
とにより２つのコンデンサを構成し、前記容器に
は磁性流体及び該磁性流体と混合せず且つ比重の
異なる媒体を封入し、前記容器の周囲には前記磁
性流体に一定の磁気を与えて該磁性流体を筒状に
保持する定磁気発生手段を設け、更に前記２つの
コンデンサの静電容量の変化を検出する検出手段
を具備することを特徴とする加速度センサ。1. Two capacitors are constituted by one electrode arranged in a container and two electrodes arranged in parallel around the container in opposition to this electrode, and the container contains a magnetic fluid and the magnetic fluid. Media that are not mixed and have different specific gravities are enclosed, constant magnetism generating means is provided around the container to apply a constant magnetism to the magnetic fluid to hold the magnetic fluid in a cylindrical shape, and furthermore, the two capacitors are An acceleration sensor comprising a detection means for detecting a change in capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10811984A JPS60252271A (en) | 1984-05-28 | 1984-05-28 | Acceleration sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10811984A JPS60252271A (en) | 1984-05-28 | 1984-05-28 | Acceleration sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60252271A JPS60252271A (en) | 1985-12-12 |
| JPH036464B2 true JPH036464B2 (en) | 1991-01-30 |
Family
ID=14476399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10811984A Granted JPS60252271A (en) | 1984-05-28 | 1984-05-28 | Acceleration sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60252271A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0632626Y2 (en) | 1988-07-28 | 1994-08-24 | 株式会社ゼクセル | Sensor |
-
1984
- 1984-05-28 JP JP10811984A patent/JPS60252271A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60252271A (en) | 1985-12-12 |
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