CAPACITIVE PROXIMITY SENSOR

• Main Author: KUBO MAMORU
• Format: Patent
• Language: English; Japanese
• Published: 19.11.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SWITCHES; ELECTRICITY; EMERGENCY PROTECTIVE DEVICES; RELAYS; SELECTORS

To provide a resonance-type capacitive proximity sensor achieving a cost reduction.SOLUTION: A capacitive proximity sensor 1 of the present invention includes: oscillating means 33 outputting a high frequency signal; an LCR resonance circuit 10 which includes a sensor electrode 11 and into which the high frequency signal is input; a sensor circuit 20 outputting a determination voltage signal according to the capacitance of the sensor electrode 11; and a control section 32 detecting the proximity of a human body to the sensor electrode based on the determination voltage signal. If a determination voltage signal S1 becomes Vth2a or more after becoming a minimum voltage of Vth1a or less and Vth3a or more, the control section detects the proximity of a human body to the sensor electrode 11.SELECTED DRAWING: Figure 5 【課題】 コストダウンを可能にした共振方式の静電容量式近接センサを提供する。【解決手段】 本発明の静電容量式近接センサ１は、高周波信号を出力する発振手段３３と、センサ電極１１を含み、高周波信号が入力されるＬＣＲ共振回路１０と、センサ電極１１の容量に応じた判定電圧信号を出力するセンサ回路２０と、判定電圧信号に基づいてセンサ電極への人体の近接を検出する制御部３２を備えている。判定電圧信号Ｓ１が、Ｖｔｈ１ａ以下かつＶｔｈ３ａ以上の最小電圧となった後、Ｖｔｈ２ａ以上となった場合、センサ電極１１への人体の近接を検出する。【選択図】 図５