JPH02256316A - Contactless switch - Google Patents
Contactless switchInfo
- Publication number
- JPH02256316A JPH02256316A JP7693789A JP7693789A JPH02256316A JP H02256316 A JPH02256316 A JP H02256316A JP 7693789 A JP7693789 A JP 7693789A JP 7693789 A JP7693789 A JP 7693789A JP H02256316 A JPH02256316 A JP H02256316A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- turned
- voltage
- transistor
- distance
- 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
- 238000001514 detection method Methods 0.000 claims description 30
- 230000010355 oscillation Effects 0.000 claims description 16
- 238000013459 approach Methods 0.000 abstract description 7
- 238000009499 grossing Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Switches That Are Operated By Magnetic Or Electric Fields (AREA)
- Electronic Switches (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は被検出物体が所定距離内に接近したときにこれ
を検出して表示する近接スイッチに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a proximity switch that detects and displays when an object to be detected approaches within a predetermined distance.
近接スイッチは検出コイルを有する発振回路と、この発
振回路の出力を検出する検出回路と、この検出回路の検
出結果に基づいて信号を送出する出力回路とを備え、前
記検出コイルに被検出物体が接近するとその検出コイル
との距離により、この検出コイルに流れる電流に変化を
与え、被検出物体が近付いてこの電流値が所定レベル以
下に低下したとき、出力回路から、信号を発し、動作表
示用の表示灯を点灯または消灯させるようになっている
。このように表示灯の点灯または消灯により被検出物体
の在否を確認し、または他の機器に信号を送出するよう
にされている。The proximity switch includes an oscillation circuit having a detection coil, a detection circuit that detects the output of this oscillation circuit, and an output circuit that sends out a signal based on the detection result of this detection circuit. When the object approaches, the current flowing through the detection coil changes depending on the distance to the detection coil, and when the object to be detected approaches and this current value drops below a predetermined level, the output circuit emits a signal to display the operation. The indicator light is turned on or off. In this way, the presence or absence of a detected object is confirmed by turning on or turning off the indicator light, or a signal is sent to other equipment.
上述のように近接スイッチは、そのスイッチによってそ
の検出距離すなわち動作限界が設定されており、このス
イッチの取付者はその設定値どおりの距離に取付けるこ
とになる。ところが実際には気温変化、電圧変動などの
外部要因により検出距離が変化し、近接スイッチが動作
したり、しなかったりすることがある。As mentioned above, the detection distance, that is, the operating limit of the proximity switch is set by the switch, and the person who installs the switch installs the switch at a distance according to the set value. However, in reality, the detection distance may change due to external factors such as changes in temperature or voltage, and the proximity switch may or may not operate.
本発明の目的は、確実に動作する設定位置決定を容易な
ものとすることができる近接スイッチを提供することに
ある。SUMMARY OF THE INVENTION An object of the present invention is to provide a proximity switch that can operate reliably and facilitates setting position determination.
上述の課題を解決するため本発明は、検出コイルを有す
る発振回路と、この発振回路の出力を検出する検出回路
と、この検出回路の検出結果に基づいて信号を送出する
出力回路とを備えた近接スイッチにおいて、前記発振回
路の出力に基づいて近接スイッチが安定動作する範囲内
に被検出物体が存在するとき表示素子を作動させる安定
動作表示回路を設けたことを特徴とする。In order to solve the above problems, the present invention includes an oscillation circuit having a detection coil, a detection circuit that detects the output of this oscillation circuit, and an output circuit that sends out a signal based on the detection result of this detection circuit. The proximity switch is characterized in that it includes a stable operation display circuit that operates a display element when a detected object is present within a range in which the proximity switch operates stably based on the output of the oscillation circuit.
本発明の近接スイッチにおいては、発振回路の出力が所
定レベルまで低下すると発光ダイオードなどの表示素子
を点灯（或は消灯）する安定動作表示回路を設け、この
安定動作表示回路の作動により近接スイッチと被検出物
体との距離を設定する。すなわち、被検出物体が検出コ
イルに接近しその発振回路の出力電圧が低下すると、ま
ず検出回路により発振回路の出力電圧の低下が検出され
て検出回路が動作する。このとき安定動作表示回路はま
だ動作せず、被検出物体がさらに検出コイルに接近した
とき始めて安定動作表示回路が動作する。したがって、
近接スイッチの取付けにあたってはこの安定動作表示回
路が確実に動作する位置に近接スイッチを設置すればよ
い。The proximity switch of the present invention is provided with a stable operation display circuit that lights up (or turns off) a display element such as a light emitting diode when the output of the oscillation circuit drops to a predetermined level. Set the distance to the detected object. That is, when the object to be detected approaches the detection coil and the output voltage of the oscillation circuit decreases, the detection circuit first detects the decrease in the output voltage of the oscillation circuit and operates the detection circuit. At this time, the stable operation indicator circuit does not operate yet, and only when the object to be detected further approaches the detection coil does the stable operation indicator circuit operate. therefore,
When installing the proximity switch, it is sufficient to install the proximity switch in a position where this stable operation display circuit can operate reliably.
第１図に本発明による近接スイッチの一実施例を示す、
第１図において、近接スイッチは発振回路１、平滑回路
２、検出回路３、出力回路４、安定動作表示回路５など
を備え、電源６を定電圧回路７で安定化した電圧■で駆
動される０発振回路１はコンデンサ８、検出コイル９か
らなる共振回路を有し、発振している。平滑回路２は発
振回路１の発振出力を整流し、平滑化してその電圧■。FIG. 1 shows an embodiment of a proximity switch according to the present invention.
In FIG. 1, the proximity switch is equipped with an oscillation circuit 1, a smoothing circuit 2, a detection circuit 3, an output circuit 4, a stable operation display circuit 5, etc., and is driven by a voltage ■ stabilized by a constant voltage circuit 7 from a power source 6. The zero oscillation circuit 1 has a resonant circuit consisting of a capacitor 8 and a detection coil 9, and oscillates. The smoothing circuit 2 rectifies and smoothes the oscillation output of the oscillation circuit 1 to produce its voltage ■.
を検出回路３と安定動作表示回路５に送る。検出回路３
は平滑回路２の出力電圧両抵抗１０．１１で分圧した抵
抗１１の両端の電圧をトランジスタ１２のベースに印加
する。このトランジスタ１２は抵抗１３、トランジスタ
１２のコレクタ・エミッタ、抵抗１４を直列に接続して
定電圧回路７の出力端に接続されている。また抵抗１３
とトランジスタ１２のコレクタ・エミッタの直列回路と
並列に抵抗１５、トランジスタ１６のコレクタ・エミッ
タの直列回路が接続され、トランジスタ１２のコレクタ
と抵抗１３の接続点がトランジスタ１６のベースに接続
されている。出力回路４は抵抗１５とトランジスタ１６
のコレクタとの接続点がベースに接続されたトランジス
タ１７と両抵抗１８．１９の直列回路が定電圧回路７の
出力端に接続され、両抵抗１８．１９の接続点が発光ダ
イオード２０を介して出力トランジスタ２１のベースに
接続されている。出力トランジスタ２１のコレクタ・エ
ミッタは負荷２２を介して電源６に接続されている。is sent to the detection circuit 3 and the stable operation display circuit 5. Detection circuit 3
The output voltage of the smoothing circuit 2 is divided by the resistors 10 and 11, and the voltage across the resistor 11 is applied to the base of the transistor 12. This transistor 12 is connected to the output end of the constant voltage circuit 7 by connecting a resistor 13, the collector/emitter of the transistor 12, and a resistor 14 in series. Also resistance 13
A resistor 15 and a collector-emitter series circuit of the transistor 16 are connected in parallel with the collector-emitter series circuit of the transistor 12, and the connection point between the collector of the transistor 12 and the resistor 13 is connected to the base of the transistor 16. Output circuit 4 includes resistor 15 and transistor 16
A series circuit consisting of a transistor 17 whose base is connected to the collector of the transistor 17 and both resistors 18 and 19 is connected to the output end of the constant voltage circuit 7, and a series circuit of the transistor 17 whose collector is connected to its base is connected to the output terminal of the constant voltage circuit 7. It is connected to the base of the output transistor 21. The collector and emitter of the output transistor 21 are connected to the power supply 6 via a load 22.
安定動作表示回路５は定電圧回路７の出力端に接続され
た両抵抗２３．２４の接続点にベースが接続されたトラ
ンジスタ２５のコレクタが抵抗２６を介して定電圧回路
７の出力端に接続され、エミッタが平滑回路２の出力端
に接続されている。そしてトランジスタ２７１発光ダイ
オード２８．抵抗２９の直列回路が定電圧回路７に接続
され、トランジスタ２７のベースはトランジスタ２５の
コレクタと抵抗２６の接続点に接続されている。すなわ
ち、検出回路３と安定動作表示回路５はいずれも平滑回
路２の出力電圧を入力として動作するように接続されて
いる。In the stable operation display circuit 5, the collector of a transistor 25 whose base is connected to the connection point of both resistors 23 and 24 connected to the output end of the constant voltage circuit 7 is connected to the output end of the constant voltage circuit 7 via a resistor 26. The emitter is connected to the output terminal of the smoothing circuit 2. and transistor 271 light emitting diode 28. A series circuit of a resistor 29 is connected to the constant voltage circuit 7, and the base of the transistor 27 is connected to the connection point between the collector of the transistor 25 and the resistor 26. That is, the detection circuit 3 and the stable operation display circuit 5 are both connected to operate with the output voltage of the smoothing circuit 2 as input.
検出コイル９から被検出物体までの距離りと平滑回路２
の出力電圧ＶＣとの関係は第２図に示すとおり、被検出
物体が検出コイル９から距離Ｌ０離れているとき平滑回
路２の出力電圧Ｖ、は例えば電圧ｖ０と高いから分圧抵
抗１１の電圧も高く、トランジスタ１２がオンし、トラ
ンジスタ１６がオフする。したがってトランジスタ１７
がオフし、トランジスタ２１もオフし、発光ダイオード
２０は発光しない、勿論負荷２２には通電しない、この
とき、トランジスタ２５のエミッタには電圧ｖ０が印加
され、この電圧ｖ０は電圧Ｖからトランジスタ２５のベ
ース・エミッタ電圧ＶＢＥを引いたり値より高いからト
ランジスタ２５はオフし、トランジスタ２７がオフする
。したがって発光ダイオード２８は発光しない、距離り
が距離Ｌ８以下になると電圧ｖｃは電圧ｖｌ以下に低下
するからトランジスタ１２はオフし、トランジスタ１６
はオンする。したがってトランジスタ１７がオンし、ト
ランジスタ２１にベース、電流が流れ、発光ダイオード
２０を発光させる。Distance from detection coil 9 to detected object and smoothing circuit 2
As shown in FIG. 2, the output voltage V of the smoothing circuit 2 is as high as voltage v0, for example, when the object to be detected is a distance L0 away from the detection coil 9, so the voltage across the voltage dividing resistor 11 is as shown in FIG. is also high, transistor 12 is turned on and transistor 16 is turned off. Therefore transistor 17
is turned off, the transistor 21 is also turned off, the light emitting diode 20 does not emit light, and of course the load 22 is not energized. At this time, a voltage v0 is applied to the emitter of the transistor 25, and this voltage v0 is changed from the voltage V to the transistor 25. Since the base-emitter voltage VBE is subtracted or is higher than the value, transistor 25 is turned off and transistor 27 is turned off. Therefore, the light emitting diode 28 does not emit light. When the distance becomes less than the distance L8, the voltage VC decreases to less than the voltage Vl, so the transistor 12 is turned off, and the transistor 16
turns on. Therefore, the transistor 17 is turned on, and current flows through the transistor 21, causing the light emitting diode 20 to emit light.
勿論負荷２２には通電される。しかしトランジスタ２５
は第２図の電圧Ｖ２でオンするように設定されているた
めトランジスタ２５はオフ状態のままで、トランジスタ
２７もオフであり、発光ダイオード２８は発光しない。Of course, the load 22 is energized. But transistor 25
is set to turn on at voltage V2 in FIG. 2, so transistor 25 remains off, transistor 27 is also off, and light emitting diode 28 does not emit light.
このように被検出物体が距ＭＬｔにあるときは未だ気温
変化や電圧変動により電圧ｖｃが変動するおそれはある
が、被検出物体が距離Ｌ＋に近づくともはや気温変化や
電圧変動により不安定にな発光ダイオード２８が発光す
る。このようにして検出コイル９と被検出物体との距離
りは距Ｍ Ｌ＋ を標準として決めるようにすることに
より、近接スイッチの設定位置の調整を容易に行うこと
ができる。In this way, when the detected object is at distance MLt, there is still a risk that voltage vc will fluctuate due to temperature changes or voltage fluctuations, but as the detected object approaches distance L+, it will no longer be unstable due to temperature changes or voltage fluctuations. The light emitting diode 28 emits light. By determining the distance between the detection coil 9 and the object to be detected using the distance M L+ as a standard in this manner, the set position of the proximity switch can be easily adjusted.
本発明によれば、近接スイッチの感度が安定する距離範
囲内で安定動作表示回路を動作させ１発光ダイオードを
発光させるようにしたので、この発光ダイオードの点滅
を標準として近接スイッチの検出コイルと被検出物体と
の距離を決めるようにしたので温度変化や電圧変動によ
る近接スイッチの誤動作をなくすことができ、近接スイ
ッチと被検出物体との距離の設定が容易にできるという
効果がある。According to the present invention, the stable operation display circuit is operated within a distance range in which the sensitivity of the proximity switch is stable, and one light emitting diode is made to emit light. Since the distance to the detected object is determined, malfunctions of the proximity switch due to temperature changes or voltage fluctuations can be eliminated, and the distance between the proximity switch and the detected object can be easily set.
第１図は本発明による近接スイッチの一実施例を示す結
線図、第２図は近接スイッチの検出コイルと被検出物体
の間の距離と平滑回路の出力電圧との関係を表す特性図
である。
１：発振回路、３：検出回路、４：出力回路、・、′−
／
〜FIG. 1 is a wiring diagram showing an embodiment of the proximity switch according to the present invention, and FIG. 2 is a characteristic diagram showing the relationship between the distance between the detection coil of the proximity switch and the object to be detected and the output voltage of the smoothing circuit. . 1: Oscillation circuit, 3: Detection circuit, 4: Output circuit,...'-
/ ~
Claims (1)
力を検出する検出回路と、この検出回路の検出結果に基
づいて信号を送出する出力回路とを備えた近接スイッチ
において、前記発振回路の出力に基づいて近接スイッチ
が安定に動作する範囲内に被検出物体が存在するとき表
示素子を作動させる安定動作表示回路を設けたことを特
徴とする近接スイッチ。1) In a proximity switch equipped with an oscillation circuit having a detection coil, a detection circuit that detects the output of this oscillation circuit, and an output circuit that sends out a signal based on the detection result of this detection circuit, the output of the oscillation circuit 1. A proximity switch comprising a stable operation display circuit that operates a display element when a detected object exists within a range in which the proximity switch operates stably based on the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7693789A JPH02256316A (en) | 1989-03-29 | 1989-03-29 | Contactless switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7693789A JPH02256316A (en) | 1989-03-29 | 1989-03-29 | Contactless switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02256316A true JPH02256316A (en) | 1990-10-17 |
Family
ID=13619647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7693789A Pending JPH02256316A (en) | 1989-03-29 | 1989-03-29 | Contactless switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02256316A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5367198A (en) * | 1990-06-11 | 1994-11-22 | I F M Electronic Gmbh | Proximity detector with error-preventing ambient condition compensation |
| US7432847B2 (en) | 2004-06-03 | 2008-10-07 | Wireless 2000 Rf & Uwb Technologies Ltd. | Ultra-wideband transceiver |
-
1989
- 1989-03-29 JP JP7693789A patent/JPH02256316A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5367198A (en) * | 1990-06-11 | 1994-11-22 | I F M Electronic Gmbh | Proximity detector with error-preventing ambient condition compensation |
| US7432847B2 (en) | 2004-06-03 | 2008-10-07 | Wireless 2000 Rf & Uwb Technologies Ltd. | Ultra-wideband transceiver |
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