Rain sensor for glass shut
First Claim
1. A rain sensor in which an optical effective radiation is subjected to at least one total reflection in a sheet of glass on which the rain impinges, comprising a coupling-in part for coupling the effective radiation into the sheet of glass, a coupling-out part for coupling the effective radiation out of the sheet of glass at the end of a measuring segment of the sheet of glass, with the coupling-out part having at least one separating surface on which the coupled-out effective radiation and a present interference radiation impact, with the at least one separating surface being oriented such that only one of the two radiations is totally reflected at the separating surface;
- and a radiation-measuring device for detecting the effective radiation coupled out of the coupling-out part after impacting said at least one separating surface.
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Accused Products
Abstract
A rain sensor in which an optical effective radiation (11) is subjected to at least one total reflection in a sheet of glass (16). The effective radiation (11) coupled out of the sheet of glass (16) into a coupling-out part (22) at the end of a measuring segment (24) and possibly present interference radiation (31'"'"') impact a separating surface (25) of the coupling out part, at which surface only one of the two radiations (11, 31'"'"') is totally reflected. The separating surface (25) permits a separation of the interference radiation (31'"'"') from the effective radiation (11) before it impacts a radiation-measuring device (30). The rain sensor of the invention is particularly suited for use in motor vehicles in connection with a windshield-wiping system which is operated automatically as a function of the rain sensor.
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Citations
10 Claims
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1. A rain sensor in which an optical effective radiation is subjected to at least one total reflection in a sheet of glass on which the rain impinges, comprising a coupling-in part for coupling the effective radiation into the sheet of glass, a coupling-out part for coupling the effective radiation out of the sheet of glass at the end of a measuring segment of the sheet of glass, with the coupling-out part having at least one separating surface on which the coupled-out effective radiation and a present interference radiation impact, with the at least one separating surface being oriented such that only one of the two radiations is totally reflected at the separating surface;
- and a radiation-measuring device for detecting the effective radiation coupled out of the coupling-out part after impacting said at least one separating surface.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
Specification