Sensor device for determining the degree of wetting and/or soiling on window panes
AssigneeRobert Bosch GmbH
InventorsRainer Pientka, Hans Meier, Francois Schabanel
Life of this patent
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Abstract
A sensor device for determining the degree of wetting and/or soiling of a pane in a motor vehicle is provided. The sensor device detects the coating of moisture on the outer side of the pane via an optical beam which is arranged in the area of the pane. The sensor device includes a reflector positioned in the pane, the reflector directing the beam through the pane under conditions of total reflection or reflection at the outer side of the pane and at the reflector. The pane additionally includes a light filter which absorbs a selected wavelength of sunlight. The attenuation is reduced via an optically more absorbent layer of the light filter.
Claims11
A pane for a motor vehicle, comprising:
- a plurality of layers;
- and
- a reflector arranged between two of the plurality of layers for reflecting a light beam, the reflector being arranged to direct the light beam at an outer side of the pane and at the reflector under a condition of at least one of total reflection and reflections;
- wherein, within a portion of the pane that is coextensive with a length of the reflector, the beam is reflectable within the pane in a path bounded by the outer side of the pane and a side of the reflector facing the outer side of the pane.
Dependencies are inferred from the claim text.