JPH097478A - Proximity switch - Google Patents

Proximity switch

Info

Publication number
JPH097478A
JPH097478A JP18107995A JP18107995A JPH097478A JP H097478 A JPH097478 A JP H097478A JP 18107995 A JP18107995 A JP 18107995A JP 18107995 A JP18107995 A JP 18107995A JP H097478 A JPH097478 A JP H097478A
Authority
JP
Japan
Prior art keywords
switch
reed switch
reed
magnet
proximity switch
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
Application number
JP18107995A
Other languages
Japanese (ja)
Inventor
Masato Noro
正人 野呂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokin Corp
Original Assignee
Tokin Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tokin Corp filed Critical Tokin Corp
Priority to JP18107995A priority Critical patent/JPH097478A/en
Publication of JPH097478A publication Critical patent/JPH097478A/en
Pending legal-status Critical Current

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  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Abstract

PURPOSE: To detect a malfunction of reed switches by an external magnetic field by arranging the reed switches, which are always turned on and off by coils, in the vicinity of a proximity switch composed of the reed switches and a permanent magnet. CONSTITUTION: A reed switch 3d exists in a case 1, and coils 4a, 4b and 4c on which AC voltage is impressed are arranged on its periphery. Reed switches 3a, 3b and 3c on which DC voltage is impressed are arranged in hollow parts of these coils. When a permanent magnet 2 draws near the switch 3d and the other magnet approaches during operation, since the switches (3a to c) are always forcedly turned on and off by the coils (4a to c), turning-on times become different from each other according to a distance up to the magnet from the respective switches. Therefore, the other magnet approaching from outside can be detected.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、リードスイッチとこれ
を駆動する磁石とからなる常開型磁気式の近接スイッチ
に係り、特に、その構造に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a normally open magnetic proximity switch comprising a reed switch and a magnet for driving the reed switch, and more particularly to the structure thereof.

【0002】[0002]

【従来の技術】図2に、従来の常開型磁気式の近接スイ
ッチの一例を示す。一般に、この種の常開型磁気式の近
接スイッチは、図2に示すように、ケース21の外側に
ある永久磁石2の磁界により、ケース21内に固定され
たリードスイッチ23の接点片にN極あるいはS極が誘
起されるため、この磁気吸引力によりリードスイッチ2
3の接点片が閉に動作し、また、永久磁石2がリードス
イッチ23から離れて磁界が取り除かれると、リードス
イッチ23の接点片が、その弾性により開状態に戻るも
のであり、これら原理を利用して、ドアの開閉等が検出
できる。
2. Description of the Related Art FIG. 2 shows an example of a conventional normally open magnetic proximity switch. Generally, in this type of normally open magnetic proximity switch, as shown in FIG. 2, the contact piece of the reed switch 23 fixed in the case 21 is N-contacted by the magnetic field of the permanent magnet 2 outside the case 21. Since the pole or the S pole is induced, this magnetic attraction force causes the reed switch 2
When the contact piece of No. 3 is closed and the magnetic field is removed by separating the permanent magnet 2 from the reed switch 23, the contact piece of the reed switch 23 returns to the open state due to its elasticity. It can be used to detect the opening and closing of the door.

【0003】[0003]

【発明が解決しようとする課題】ところで、前記のケー
ス21、リードスイッチ23、及び永久磁石2とで構成
された近接スイッチでは、永久磁石2以外の磁石がリー
ドスイッチ23に近接した場合にもリードスイッチ23
が動作してしまうという欠点がある。
By the way, in the proximity switch composed of the case 21, the reed switch 23 and the permanent magnet 2, the reed switch is used even when a magnet other than the permanent magnet 2 approaches the reed switch 23. Switch 23
Has the drawback that it will work.

【0004】そこで、本発明の技術的課題は、上記欠点
を解決し、リードスイッチの誤動作を検知することが可
能な、高性能な近接スイッチを提供することにある。
Therefore, a technical object of the present invention is to solve the above-mentioned drawbacks and to provide a high-performance proximity switch capable of detecting a malfunction of a reed switch.

【0005】[0005]

【課題を解決するための手段】本発明の近接スイッチ
は、前述の欠点を改善するため、ケース内に収納された
リードスイッチの周囲を、交流電圧を印加した複数個の
コイルで囲むように配置し、さらにこのコイルの中空部
には直流電圧を印加したリードスイッチを配置して構成
したものである。
In order to solve the above-mentioned drawbacks, the proximity switch of the present invention is arranged so that the periphery of the reed switch housed in the case is surrounded by a plurality of coils to which an AC voltage is applied. Further, a reed switch to which a DC voltage is applied is arranged in the hollow portion of this coil.

【0006】即ち、本発明は、永久磁石とリードスイッ
チとコイルを組み合わせてなる近接スイッチであって、
前記コイルの中空部にリードスイッチを挿入配置し、さ
らに前記コイルには交流電圧を、前記リードスイッチに
は直流電圧を印加することを特徴とする近接スイッチで
ある。
That is, the present invention is a proximity switch comprising a combination of a permanent magnet, a reed switch and a coil,
The proximity switch is characterized in that a reed switch is inserted and arranged in the hollow portion of the coil, and an AC voltage is applied to the coil and a DC voltage is applied to the reed switch.

【0007】本発明は、上記の近接スイッチにおいて、
前記コイルの中空部に挿入配置したリードスイッチの近
傍に、コイルと組み合わされていないリードスイッチを
配したことを特徴とする近接スイッチである。
The present invention provides the above proximity switch,
The proximity switch is characterized in that a reed switch that is not combined with the coil is arranged in the vicinity of the reed switch that is inserted and arranged in the hollow portion of the coil.

【0008】[0008]

【作用】本発明の近接スイッチでは、リードスイッチの
周囲を、交流電圧を印加した複数個のコイルで囲むよう
に配置し、さらに前記コイルの中空部には直流電圧を印
加したリードスイッチを配置しているため、リードスイ
ッチは、コイルの交流電圧の周波数に同期した直流のO
N−OFF信号を強制的に出力している。
In the proximity switch of the present invention, the reed switch is surrounded by a plurality of coils to which an AC voltage is applied, and the reed switch to which a DC voltage is applied is arranged in the hollow portion of the coil. Therefore, the reed switch is a direct current O synchronized with the frequency of the alternating voltage of the coil.
The N-OFF signal is forcibly output.

【0009】この状態で、リードスイッチの周囲に他の
磁石が近づくと、その磁界によりリードスイッチから出
力されるON−OFF信号のONしている時間が変化す
ることとなる。
In this state, when another magnet approaches the periphery of the reed switch, the magnetic field changes the ON time of the ON-OFF signal output from the reed switch.

【0010】従って、本来の永久磁石以外の磁石、又
は、それに類するもので、リードスイッチを動作させよ
うとすることを検知することができる。従って、近接ス
イッチの誤動作を検知することができる。
Therefore, it is possible to detect an attempt to operate the reed switch with a magnet other than the original permanent magnet, or a magnet similar thereto. Therefore, the malfunction of the proximity switch can be detected.

【0011】[0011]

【実施例】以下に、本発明の実施例について図面を説明
しながら詳しく説明する。
Embodiments of the present invention will be described below in detail with reference to the drawings.

【0012】図1は、本発明による近接スイッチの構成
を示す斜視図である。図1において、ケース1の内部に
リードスイッチ3dがあり、その周囲には交流電圧を印
加したコイル4a,4b,4cが配置されている。さら
に、コイルの中空部には、直流電圧を印加したリードス
イッチ3a,3b,3cが配置されている。
FIG. 1 is a perspective view showing the structure of a proximity switch according to the present invention. In FIG. 1, a reed switch 3d is provided inside a case 1, and coils 4a, 4b, 4c to which an AC voltage is applied are arranged around the reed switch 3d. Further, reed switches 3a, 3b, 3c to which a DC voltage is applied are arranged in the hollow portion of the coil.

【0013】この状態において、永久磁石2がリードス
イッチ3dに近接し、リードスイッチ3dを動作させて
いる状態で外部より他の磁石が近付けられた場合、リー
ドスイッチ3dを囲んでいるリードスイッチ3a,3
b,3cは、外部からの他の磁石の磁界により動作状態
になろうとする。
In this state, when the permanent magnet 2 is close to the reed switch 3d and another magnet is approached from the outside while the reed switch 3d is operating, the reed switch 3a surrounding the reed switch 3d, Three
b and 3c tend to be in operation by the magnetic field of another magnet from the outside.

【0014】この時、リードスイッチ3a,3b,3c
は、これらのリードスイッチ3a,3b,3cを取り巻
くコイル4a,4b,4cによって常時強制的にON−
OFFさせているため、リードスイッチ3a,3b,3
cと、外部から近づく他の磁石の距離によってONする
時間が異なるようになるため、外部から近づく他の磁石
を検知することが可能となる。
At this time, the reed switches 3a, 3b, 3c
Is always forced ON by the coils 4a, 4b, 4c surrounding these reed switches 3a, 3b, 3c.
Since it is turned off, the reed switches 3a, 3b, 3
Since the ON time differs depending on the distance between c and another magnet approaching from the outside, it is possible to detect another magnet approaching from the outside.

【0015】本発明における近接スイッチと、従来の近
接スイッチとの相違は、図1と図2を比較すると明瞭で
あるが、本発明においては、外部から近づく他の磁石を
検知する為のリードスイッチ3a,3b,3cがある
が、従来品においては、前記検知用リードスイッチがな
いという点である。又、本発明におけるコイルの中空部
に配置したリードスイッチと永久磁石からなる近接スイ
ッチを単独で用いて、閉状態のON−OFF信号とそれ
以外のON−OFF信号を判別する手段を設けることに
より、外部磁石による誤動作を検知することもできる。
The difference between the proximity switch of the present invention and the conventional proximity switch is clear when comparing FIGS. 1 and 2, but in the present invention, a reed switch for detecting another magnet approaching from the outside. Although there are 3a, 3b and 3c, the point is that the conventional reed switch does not have the detection reed switch. Further, by using the reed switch arranged in the hollow portion of the coil and the proximity switch composed of a permanent magnet alone in the present invention, by providing a means for discriminating the ON-OFF signal in the closed state from the other ON-OFF signals. It is also possible to detect a malfunction caused by an external magnet.

【0016】[0016]

【発明の効果】以上述べたごとく、本発明によれば、リ
ードスイッチと永久磁石で構成された近接スイッチの近
傍に、コイルにて常時強制的にON−0FFさせている
リードスイッチを設けることによって、外部から近づく
他の磁石によるリードスイッチの誤動作を検知すること
ができる、高性能な常開型磁気式の近接スイッチの提供
が可能となった。
As described above, according to the present invention, by providing the reed switch which is always forced ON-0FF by the coil in the vicinity of the proximity switch composed of the reed switch and the permanent magnet. , It has become possible to provide a high-performance normally open magnetic proximity switch capable of detecting malfunction of the reed switch caused by another magnet approaching from the outside.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明による近接スイッチの構成を示す斜視
図。
FIG. 1 is a perspective view showing a configuration of a proximity switch according to the present invention.

【図2】従来の近接スイッチの構成を示す斜視図。FIG. 2 is a perspective view showing a configuration of a conventional proximity switch.

【符号の説明】[Explanation of symbols]

1,21 ケース 2 永久磁石 3a,3b,3c,3d,23 リードスイッチ 4a,4b,4c コイル 1, 21 Case 2 Permanent magnet 3a, 3b, 3c, 3d, 23 Reed switch 4a, 4b, 4c Coil

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 永久磁石とリードスイッチとコイルを組
み合わせてなる近接スイッチであって、前記コイルの中
空部にリードスイッチを挿入配置し、さらに前記コイル
には交流電圧を、前記リードスイッチには直流電圧を印
加することを特徴とする近接スイッチ。
1. A proximity switch formed by combining a permanent magnet, a reed switch and a coil, wherein a reed switch is inserted and arranged in a hollow portion of the coil, and an alternating voltage is applied to the coil and a direct current is applied to the reed switch. A proximity switch characterized by applying a voltage.
【請求項2】 請求項1記載の近接スイッチにおいて、
前記コイルの中空部に挿入配置したリードスイッチの近
傍に、コイルと組み合わされていないリードスイッチを
配したことを特徴とする近接スイッチ。
2. The proximity switch according to claim 1, wherein
A proximity switch characterized in that a reed switch which is not combined with the coil is arranged in the vicinity of the reed switch inserted and arranged in the hollow portion of the coil.
JP18107995A 1995-06-22 1995-06-22 Proximity switch Pending JPH097478A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18107995A JPH097478A (en) 1995-06-22 1995-06-22 Proximity switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18107995A JPH097478A (en) 1995-06-22 1995-06-22 Proximity switch

Publications (1)

Publication Number Publication Date
JPH097478A true JPH097478A (en) 1997-01-10

Family

ID=16094449

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18107995A Pending JPH097478A (en) 1995-06-22 1995-06-22 Proximity switch

Country Status (1)

Country Link
JP (1) JPH097478A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6972651B2 (en) 2001-03-13 2005-12-06 Takamisawa Electric Co., Ltd Switch operable under a predetermined condition, external magnetic field generating unit, combination of such a switch and an external magnetic field generating unit and electronic apparatus incorporating the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6972651B2 (en) 2001-03-13 2005-12-06 Takamisawa Electric Co., Ltd Switch operable under a predetermined condition, external magnetic field generating unit, combination of such a switch and an external magnetic field generating unit and electronic apparatus incorporating the same

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