{
  "$type": "site.standard.document",
  "description": "There is provided a raindrop detecting device using a light-emitting element and a light-receiving element, which can accurately detect a change of a received light signal in a wide dynamic range regardless of a high or low level of the received light signal. A light-receiving current of a photo…",
  "path": "/patents/980397",
  "publishedAt": "2013-12-25T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60S1/0818",
    "NILES CO LTD [JP]"
  ],
  "textContent": "There is provided a raindrop detecting device using a light-emitting element and a light-receiving element, which can accurately detect a change of a received light signal in a wide dynamic range regardless of a high or low level of the received light signal. A light-receiving current of a photo diode as the light-receiving element is converted by a current to voltage conversion circuit, and a peak of the voltage is input to a range switching amplifying circuit from a peak hold circuit. The range switching amplifying circuit is configured such that a reverse input terminal of an operational amplifier is connected to a control terminal of a control component via a resistance and the control terminal is switched to Hi and Lo, thus outputting a Hi range amplification result Vout (H) and a Lo range amplification result Vout (L) that are offset from each other by Vos. The control component selects the output that is not saturated from a possible output range of the operational amplifier out of Vout (H) + Vos or Vout (L) to be used for determination on presence/absence of raindrops.",
  "title": "State detecting device"
}