{
  "$type": "site.standard.document",
  "description": "In a human body detector, a wave-detection circuit (35) for detecting waves of a resonance voltage (V1) is connected to a sensor resonance circuit (35) that varies a constant frequency voltage in accordance with a change in the capacitance of a sensor electrode (37). The wave-detection circuit (36)…",
  "path": "/patents/1106112",
  "publishedAt": "2002-03-13T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60R25/246",
    "AISIN SEIKI [JP]"
  ],
  "textContent": "In a human body detector, a wave-detection circuit (35) for detecting waves of a resonance voltage (V1) is connected to a sensor resonance circuit (35) that varies a constant frequency voltage in accordance with a change in the capacitance of a sensor electrode (37). The wave-detection circuit (36) is connected to a differentiator (41) that acquires a changing rate ( tau ) by differentiating the wave-detection voltage (V2) with respect to time, and allows a voltage to pass if the changing rate ( tau )of the voltage is greater than or equal to a predetermined value ( tau A). The differentiator (41) is connected to a high-pass filter (42) that allows passage of a voltage whose changing rate ()is greater than or equal to a second predetermined value ( tau B). The high-pass filter (42) is connected to a comparator (43) whose non-inversion input terminal (43b) is connected to a power source (44) that applies thereto a reference voltage (V4).",
  "title": "Human body detector"
}