An attached matter detector (10) includes a plurality of light-emitting elements (11A to 11H, 41 A to 41D) which are aligned linearly and emit light; a plurality of collimator lenses (12A to 12H) which are aligned linearly corresponding to the light-emitti...

The sensor (3) has square-shaped transmitting elements emitting electromagnetic radiation. A receptor element receives a part of the emitted radiation. A control and evaluating device actuates the transmitting elements and determines upon on the received r...

To a desired target light-receiving level in a state where a windshield is clean, a lower normal level possibly causing a driver to have a feeling of strangeness in an operation of a wiper 21 and recognize aging degradation when a light-receiving signal is...

During rain, including a light source (5) for radiating light such that the light is transmitted through a vehicle window (2), a light receiving element (6) for sensing an optical signal when the light radiated from the light source (5) is reflected from t...