Dc two-line proximity sensor having operation display lamp

動作表示灯付き直流2線式の近接センサ

Abstract

【課題】赤色LEDを単一配備して部品コストダウンを図る一方、赤色LEDを点滅点灯させても、出力電圧をこの点滅点灯に同期することなく安定させること。 【解決手段】センサ出力の出力系統(出力回路13)とは別に動作表示灯駆動系統(動作表示灯回路12)を具備すると共に、この動作表示灯駆動系統内の動作表示灯として単一の赤色LED12aを設け、この赤色LED12aを検出物体17が非検出領域にあるときは点灯停止、不安定検出領域にあるときは点滅点灯、安定検出領域にあるときは連続点灯すると共に、赤色LED12aが点滅点灯しても出力回路13の出力電圧の波形はパルス状波形にならない。 【選択図】図1
PROBLEM TO BE SOLVED: To provide stable output voltage without synchronizing with flickering of a red LED even when the red LED is made to flicker, while cost reduction of parts is achieved by arranging a single red LED.SOLUTION: A DC two-line proximity sensor includes an operation display lamp driving system (an operation display lamp circuit 12) in addition to an output system (an output circuit 13) of a sensor output, and a single red LED 12a as an operation display lamp in the operation display lamp driving system. When a detection object 17 is in a non-detection region, the red LED 12a stops lighting. When the detection object 17 is in an unstable detection region, the red LED 12a flickers. When the detection object 17 is in a stable detection region, the red LED 12 lights continuously. Even when the red LED 12a flickers, the waveform of the output voltage from the output circuit 13 does not become a pulsed waveform.

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