Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2007-08-21
2007-08-21
Le, Que T. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S221000
Reexamination Certificate
active
10514710
ABSTRACT:
A device for detecting the wetting and/or soiling of a windscreen surface, in particular in a vehicle, comprises a camera with a sensor having a plurality of light-sensitive pixels arranged as an array and adapted to be illuminated according to an illumination cycle, and having a focussing optic for a camera focus set to almost infinite. The device is further provided with a light source for illuminating a detection portion of the screen surface detectable by the camera. The light source may be switched on and off according to a predeterminable ON/OFF cycle. The ON/OFF cycle is synchronized to the illumination cycle of the camera sensor, and the wetting/soiling of the screen surface may be detected by comparing the image information from the sensor of the camera when the light source is turned on and when the light source is turned off.
REFERENCES:
patent: 6672745 (2004-01-01), Bauer et al.
patent: 19704818 (1997-08-01), None
patent: 19950060 (2001-05-01), None
patent: WO 0053466 (2000-09-01), None
patent: WO 02083468 (2002-10-01), None
International Preliminary Examination Report from PCT, Application No. PCT/EP2003/005221, Mailed: Feb. 17, 2005.
Elmos Semiconductor AG
Le Que T.
Shumaker & Sieffert
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