雨滴検出装置並びにそれを備えたワイパ自動制御装置

Raindrop detector and wiper automatic control unit having the same

Abstract

【課題】 雨滴の検出精度とコスト性とを両立する雨滴検出装置を提供する。 【解決手段】 基準光を発する発光素子24と、ウインドシールド4によって反射された基準光を受ける第一受光素子26,27と、ウインドシールド4を経由しない光路L 3 によって導かれた基準光を受ける第二受光素子28と、第一受光素子26,27の受光量の和と第二受光素子28の受光量との比を注目比としたとき、ウインドシールド4への雨滴の付着がない基準時の注目比と雨滴検出時の注目比との大小関係に基づいてウインドシールド4への雨滴の付着を判定する判定手段とを設ける。 【選択図】 図1
PROBLEM TO BE SOLVED: To provide a raindrop detector capable of making detection accuracy of raindrops and cost effectiveness compatible. SOLUTION: The detector includes a light-emitting element 24 for emitting a reference light; first light-receiving elements 26, 27 for receiving the reference light reflected by a windshield 4; a second light-receiving element 28 for receiving the reference light introduced by an optical path L 3 which bypasses the windshield 4; and a determination means for determining adhesion of raindrops onto the windshield 4, based on the relation at a level between a noted ratio at the reference time having no adhesion of raindrops onto the windshield 4 and a noted ratio at the raindrop detection time, when it is used as the noted ratio the ratio between the sum of the amount of received light by the first light-receiving elements 26, 27 and the amount of received light by the second light-receiving element 28. COPYRIGHT: (C)2009,JPO&INPIT

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