OPTICAL SENSOR DEVICE
First Claim
1. An optical sensor device comprising at least one light emitter, at least one light receiver, and rotationally symmetrically shaped Fresnel prism structures which are adapted to be coupled on a first side to a windshield pane of a vehicle, and which on a second, opposite side take up light from the light emitter, couple the light taken up from the light emitter into the pane and, after a total reflection on an internal surface of the pane, direct said light onto the light receiver.
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Accused Products
Abstract
An optical sensor device that can be used as a rain sensor has a light emitter, a light receiver, and an optical plate with rotationally symmetrically shaped Fresnel prism structures, which is coupled to a pane, in particular a windshield of a vehicle, by means of a coupling layer. On its opposite side, the optical plate takes up light from the light emitter. The light is coupled into the pane and, after a total reflection on an internal surface of the pane, is directed onto the light receiver.
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Citations
16 Claims
- 1. An optical sensor device comprising at least one light emitter, at least one light receiver, and rotationally symmetrically shaped Fresnel prism structures which are adapted to be coupled on a first side to a windshield pane of a vehicle, and which on a second, opposite side take up light from the light emitter, couple the light taken up from the light emitter into the pane and, after a total reflection on an internal surface of the pane, direct said light onto the light receiver.
Specification