JP2002246889A - Detection switch - Google Patents
Detection switchInfo
- Publication number
- JP2002246889A JP2002246889A JP2001046347A JP2001046347A JP2002246889A JP 2002246889 A JP2002246889 A JP 2002246889A JP 2001046347 A JP2001046347 A JP 2001046347A JP 2001046347 A JP2001046347 A JP 2001046347A JP 2002246889 A JP2002246889 A JP 2002246889A
- Authority
- JP
- Japan
- Prior art keywords
- output
- load
- detection
- bead core
- control input
- 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
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Electronic Switches (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は耐ノイズ性を改善し
た検出スイッチに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detection switch having improved noise resistance.
【０００２】[0002]
【従来の技術】従来の検出スイッチは、図２に示すよう
な構成のものが一般的である。検出主回路２にて被検出
物の検出が行われると、その検出主回路２から出力トラ
ンジスタ３のベースに出力信号が与えられて、その出力
トランジスタ３がオン動作する。これによって、出力端
子４に接続された負荷５に電流が流れて、負荷５が動作
を行うことで、被検出物の検出が所定の出力動作で示さ
れる。2. Description of the Related Art A conventional detection switch generally has a configuration as shown in FIG. When an object to be detected is detected by the main detection circuit 2, an output signal is given from the main detection circuit 2 to the base of the output transistor 3, and the output transistor 3 is turned on. As a result, a current flows through the load 5 connected to the output terminal 4, and the load 5 operates, whereby the detection of the detection target is indicated by a predetermined output operation.
【０００３】[0003]
【発明が解決しようとする課題】ところで、前記出力端
子４には、さまざまな負荷が接続され、近年、高周波数
でスイッチング動作するものが増えてきている。このよ
うな高周波でのスイッチング動作を行う負荷５が接続さ
れると、スイッチングに伴う高周波ノイズが発生し、こ
れが出力トランジスタ３に伝搬されることがある。一般
に、負荷５のスイッチングに伴うノイズは、出力トラン
ジスタ３のコレクタ−ベース間に存在する小さな容量に
よって遮断されるが、スイッチングが高周波数で行われ
ると、ノイズの周波数スペクトルも高周波化し、コレク
タ−ベース間容量を通過してベース回路に侵入すること
がある。すると、出力トランジスタ３の動作が不安定に
なって、誤動作を引き起こすという問題があった。本発
明は、上記事情に鑑みてなされたもので、その目的は、
負荷からの高周波ノイズによる誤動作を防止できる検出
スイッチを提供するところにある。By the way, various loads are connected to the output terminal 4, and in recent years, those which perform switching operation at a high frequency are increasing. When the load 5 that performs the switching operation at such a high frequency is connected, high-frequency noise accompanying the switching is generated and may be transmitted to the output transistor 3. Generally, noise accompanying the switching of the load 5 is cut off by a small capacitance existing between the collector and the base of the output transistor 3. However, when the switching is performed at a high frequency, the frequency spectrum of the noise also increases, and the collector-base In some cases, it may enter the base circuit through the intervening capacitance. Then, there is a problem that the operation of the output transistor 3 becomes unstable and causes a malfunction. The present invention has been made in view of the above circumstances, and its purpose is to:
It is an object of the present invention to provide a detection switch that can prevent malfunction due to high frequency noise from a load.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するた
め、請求項１の発明に係る検出スイッチは、被検出物を
検出した検出結果に応じてオンオフ信号を出力する検出
手段と、制御入力端子が検出手段の出力側に接続され、
検出手段からのオンオフ信号に基づいてスイッチング動
作を行う出力スイッチング回路とを備える検出スイッチ
において、出力スイッチング回路の制御入力端子と検出
手段の出力側との間にビーズコアを配置したところに特
徴を有する。According to a first aspect of the present invention, there is provided a detection switch for outputting an on / off signal according to a detection result of an object to be detected, and a control input terminal. Is connected to the output side of the detection means,
In a detection switch including an output switching circuit that performs a switching operation based on an on / off signal from a detection unit, a feature is that a bead core is arranged between a control input terminal of the output switching circuit and an output side of the detection unit.
【０００５】[0005]
【発明の作用及び効果】本発明の構成によれば、出力ス
イッチング回路の制御入力端子と検出手段の出力側との
間にビーズコアを配置したから、接続される負荷からの
高周波ノイズを確実に遮断することができ、出力の誤作
動を防止することができる。ところで、負荷からの高周
波ノイズによる影響を排除するためには、ノイズ遮断素
子を出力スイッチング回路の出力側に配置することが一
般的に考えられる。しかし、その構成では出力スイッチ
ング回路の出力側に流れる大電流（コレクタ電流）の電
流量に応じて、定格容量の大きいものを配置することが
必要になり、検出スイッチが大型化することが避けられ
ない。これに対して、本発明では、出力スイッチング回
路の出力側に比べて電流量が小さい制御入力端子側にビ
ーズコアを配置しているから、そのビーズコアの容量も
その電流量に応じた容量で済み、コスト低減と小型化を
併せ図ることができる。According to the structure of the present invention, since the bead core is arranged between the control input terminal of the output switching circuit and the output side of the detection means, high frequency noise from the connected load is reliably cut off. Erroneous operation of the output can be prevented. By the way, in order to eliminate the influence of high frequency noise from the load, it is generally considered that a noise cutoff element is arranged on the output side of the output switching circuit. However, in such a configuration, it is necessary to arrange a large rated capacity in accordance with the amount of a large current (collector current) flowing to the output side of the output switching circuit. Absent. On the other hand, in the present invention, since the bead core is arranged on the control input terminal side where the amount of current is smaller than the output side of the output switching circuit, the capacity of the bead core only needs to be a capacity corresponding to the amount of current, Cost reduction and size reduction can be achieved at the same time.
【０００６】[0006]
【発明の実施の形態】本発明の一実施形態を図１によっ
て説明する。本実施形態に係る検出スイッチ１０は、例
えば透過型の光電スイッチであって、対向して配置され
る投光器からの光を受光し、受光した光の光量に応じた
受光信号を出力する図示しない受光部と、受光部からの
受光信号に基づいて検出信号を出力する検出部とを備え
てなる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. The detection switch 10 according to the present embodiment is, for example, a transmission-type photoelectric switch, and receives light from a projector disposed opposite thereto and outputs a light-receiving signal (not shown) according to the amount of received light. And a detection unit that outputs a detection signal based on a light reception signal from the light reception unit.
【０００７】検出スイッチ１０は、外部機器の電源供給
端子に接続される一対の電源端子（＋Ｖ端子Ｓ１及びグ
ランド端子Ｓ２）と、出力端子Ｓ３との３つの端子が備
えられている。検出スイッチ１０の検出部の回路構成
は、図１に示すように、両電源端子Ｓ１，Ｓ２に接続さ
れた検出主回路１１と、制御入力端子Ｓ４が検出主回路
１１の出力側に接続されると共にその出力側が出力端子
Ｓ３に接続された出力トランジスタＴｒを備えた出力ス
イッチング回路１２とからなる。検出主回路１１は、例
えばマイクロコンピュータを備えて構成され、受光部か
らの受光信号が所定レベル以下である場合に出力信号を
出力する。ここで、検出主回路１１の出力側と出力トラ
ンジスタＴｒの制御入力端子Ｓ４との間には、ビーズコ
アＢが配置されている。なお、本実施形態では、検出主
回路１１、出力スイッチング回路１２の出力トランジス
タＴｒ及びビーズコアＢはいずれもチップ部品であっ
て、それらは図示しないプリント基板上に所定のパター
ンで接続されて実装されている。The detection switch 10 has three terminals, a pair of power terminals (+ V terminal S1 and ground terminal S2) connected to a power supply terminal of an external device, and an output terminal S3. As shown in FIG. 1, the circuit configuration of the detection unit of the detection switch 10 is such that the detection main circuit 11 connected to both power supply terminals S1 and S2 and the control input terminal S4 are connected to the output side of the detection main circuit 11. And an output switching circuit 12 having an output transistor Tr whose output side is connected to the output terminal S3. The detection main circuit 11 includes, for example, a microcomputer, and outputs an output signal when a light receiving signal from the light receiving unit is equal to or lower than a predetermined level. Here, a bead core B is arranged between the output side of the detection main circuit 11 and the control input terminal S4 of the output transistor Tr. In the present embodiment, the output transistor Tr of the detection main circuit 11, the output transistor Tr of the output switching circuit 12, and the bead core B are all chip components, and they are connected and mounted in a predetermined pattern on a printed board (not shown). I have.
【０００８】さて、本実施形態の検出スイッチ１０を外
部機器に接続すると、外部機器から電源端子Ｓ１，Ｓ２
を介して検出主回路１１に電力が供給される。この状態
で、例えば被検出物が存在して前記投光器から検出スイ
ッチ１０の受光部に入射する光が遮られると、検出主回
路１１から出力信号がビーズコアＢを介して出力トラン
ジスタＴｒの制御入力端子Ｓ４に与えられ、出力スイッ
チング回路１２がスイッチング動作を行う。これに伴っ
て、出力端子Ｓ３に接続された外部機器内の負荷１３に
電流が流れて、負荷１３が駆動される。When the detection switch 10 of the present embodiment is connected to an external device, the power supply terminals S1, S2
Power is supplied to the detection main circuit 11 via. In this state, for example, when an object to be detected is present and light from the light projector to the light receiving portion of the detection switch 10 is blocked, an output signal from the detection main circuit 11 is transmitted to the control input terminal of the output transistor Tr via the bead core B. S4, the output switching circuit 12 performs a switching operation. Accordingly, a current flows through the load 13 in the external device connected to the output terminal S3, and the load 13 is driven.
【０００９】ここで、負荷１３が例えば高周波数でスイ
ッチング動作を行う負荷である場合には、スイッチング
動作に伴う高周波ノイズが発生し、これが出力トランジ
スタＴｒのコレクタ−ベース間容量を通過する。ところ
が、本実施形態ではビーズコアＢを検出主回路１１の出
力側と出力トランジスタＴｒの制御入力端子Ｓ４との間
に配置してある。従って、負荷１３からの高周波ノイズ
を確実に遮断することができる。しかも、ビーズコアＢ
は、大電流（コレクタ電流）が流れる出力スイッチング
回路１２の出力側ではなく、それより電流量が小さい出
力トランジスタＴｒの制御入力端子Ｓ４側に配置してあ
る。これによりビーズコアの容量もその小さい電流量に
応じた容量で済み、コスト低減が図れると共に、機器の
小型化という最近更に高まる要請に応えることが可能に
なる。If the load 13 performs a switching operation at a high frequency, for example, high-frequency noise is generated by the switching operation and passes through the collector-base capacitance of the output transistor Tr. However, in the present embodiment, the bead core B is disposed between the output side of the detection main circuit 11 and the control input terminal S4 of the output transistor Tr. Therefore, high frequency noise from the load 13 can be reliably shut off. And bead core B
Are disposed not on the output side of the output switching circuit 12 through which a large current (collector current) flows but on the control input terminal S4 side of the output transistor Tr having a smaller current amount. This allows the bead core to have a capacity corresponding to the small amount of current, thereby achieving cost reduction and responding to recently increasing demands for downsizing of equipment.
【００１０】＜他の実施形態＞本発明は、前記実施形態
に限定されるものではなく、例えば、以下に説明するよ
うな実施形態も本発明の技術的範囲に含まれ、さらに、
下記以外にも要旨を逸脱しない範囲内で種々変更して実
施することができる。 （１）上記実施形態では、出力スイッチング回路１２に
ＮＰＮトランジスタを使用したが、これ以外のスイッチ
ング素子、例えばＦＥＴ等であってもよい。<Other Embodiments> The present invention is not limited to the above embodiments. For example, the following embodiments are also included in the technical scope of the present invention.
In addition to the following, various changes can be made without departing from the scope of the invention. (1) In the above embodiment, an NPN transistor is used for the output switching circuit 12, but other switching elements, such as FETs, may be used.
【００１１】（２）上記実施形態では、透過型の光電ス
イッチに適用される場合を例に挙げて説明したが、これ
に限られず、被検出物の検知に伴い外部機器にオンオフ
信号を出力する検出スイッチであればよい。(2) In the above embodiment, a case where the present invention is applied to a transmission type photoelectric switch has been described as an example. However, the present invention is not limited to this. Any detection switch may be used.
【００１２】（３）上記実施形態では、検出主回路１１
はマイクロコンピュータで構成したものとしたが、これ
に限らず、スイッチング素子やアナログ増幅器等による
アナログ回路で構成したものであってもよい。(3) In the above embodiment, the detection main circuit 11
Is constituted by a microcomputer, but is not limited thereto, and may be constituted by an analog circuit such as a switching element or an analog amplifier.
【図１】本発明の一実施形態に係る検出スイッチの回路
図FIG. 1 is a circuit diagram of a detection switch according to an embodiment of the present invention.
【図２】従来の検出スイッチを説明するための回路図FIG. 2 is a circuit diagram illustrating a conventional detection switch.
１０…検出スイッチ １１…検出主回路 １２…出力スイッチング回路 １３…負荷 Ｂ…ビーズコア Ｓ１，Ｓ２…電源端子 Ｓ３…出力端子 Ｓ４…制御入力端子 Ｔｒ…出力トランジスタ DESCRIPTION OF SYMBOLS 10 ... Detection switch 11 ... Detection main circuit 12 ... Output switching circuit 13 ... Load B ... Bead core S1, S2 ... Power supply terminal S3 ... Output terminal S4 ... Control input terminal Tr ... Output transistor
Claims (1)
ンオフ信号を出力する検出手段と、 制御入力端子が前記検出手段の出力側に接続され、前記
検出手段からのオンオフ信号に基づいてスイッチング動
作を行う出力スイッチング回路とを備える検出スイッチ
において、 前記出力スイッチング回路の前記制御入力端子と前記検
出手段の出力側との間にビーズコアを配置したことを特
徴とする検出スイッチ。1. A detecting means for outputting an on / off signal in accordance with a detection result of detecting an object to be detected, a control input terminal being connected to an output side of the detecting means, and switching based on an on / off signal from the detecting means. A detection switch comprising an output switching circuit performing an operation, wherein a bead core is arranged between the control input terminal of the output switching circuit and an output side of the detection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001046347A JP2002246889A (en) | 2001-02-22 | 2001-02-22 | Detection switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001046347A JP2002246889A (en) | 2001-02-22 | 2001-02-22 | Detection switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002246889A true JP2002246889A (en) | 2002-08-30 |
Family
ID=18907991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001046347A Pending JP2002246889A (en) | 2001-02-22 | 2001-02-22 | Detection switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002246889A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0653796A (en) * | 1992-07-28 | 1994-02-25 | Toyo Electric Mfg Co Ltd | Drive circuit for switching element |
| JPH06177612A (en) * | 1992-10-09 | 1994-06-24 | Tohoku Ricoh Co Ltd | Wiring and connecting component for high frequency |
-
2001
- 2001-02-22 JP JP2001046347A patent/JP2002246889A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0653796A (en) * | 1992-07-28 | 1994-02-25 | Toyo Electric Mfg Co Ltd | Drive circuit for switching element |
| JPH06177612A (en) * | 1992-10-09 | 1994-06-24 | Tohoku Ricoh Co Ltd | Wiring and connecting component for high frequency |
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