Device for detecting a closed/open/broken window condition in a motor vehicle and the method for operating it; Alarmsystem and electric window system for a vehicle having one such device.

摘要

The detector is fitted to the windscreen or to any window (10) It comprises a light-emitting diode (12) installed within the rubber seal (4) and packing (5) of the window upper frame (2). The diode is directed at the face of a 45 deg. prism (16) placed along the window lower edge. The prism redirects the light on a photodiode (11) if the window is raised and fully closed or intact. The LED and photodiode are mounted on printed circuit boards (13,14) connected to an alarm circuit which periodically flashes the LED and processes the photodiode signal to verify that the window is closed.