Optoelectronic sensor device for the detection of the degree of wetting of the transparent screen of a motor vehicle with precipitation

US5818600A · kind A · utility

Inventors

• Norbert Bendicks · Breckerfeld, DE
• Berthold Esders · Schalksmühle, DE

Key dates

• Filing date: Jul 30, 1995
• Grant date: Oct 6, 1998
• Expiry date: Jul 30, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S318/02
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An optoelectronic sensor device for the detection of the degree of wetting of a transparent vehicle screen with precipitation, includes a beam guide with two opposing parallel surfaces and two surfaces which lie opposite to one another and which are angled in opposing fashion through which beams enter and exit, one of the parallel surfaces being coupled to the vehicle screen in an optical fashion, the beam entry surface cooperating with an optical transmitter and the exit surface cooperating with an optical receiver. The device limits the wavelength of rays which exit from the beam guide to the operating range of the beam transmitter. Two filters (4) are incorporated in the beam path whose pass ranges overlap within a narrow frequency band.