Crack detector and heating circuit for motor vehicle headlight light transmissive shield

Year	Description
1991	Invention patented by Ulrich V. Lange, Wolfgang Daub, and Friedrich-Karl Wendt on May 12th, 1991. Abstract: A circuit arrangement for a motor vehicle headlight including a reflector and/or a lens, a light source coupled to a voltage providing device (W), at least one electrically conductive heating element (H) mounted on or in an enclosing light-transmissive shield coupled to the voltage source, and a switching-on apparatus (E) for the heating element will, in addition to avoiding a coating and ice build-up, in an uncomplicated and cost effective manner provide a dependable, security-increasing, crack monitoring of the light transmissive shield in that the heating element is electrically coupled with an analyzing apparatus (A) which includes a light-transmissive-shield, crack-monitoring device formed as a current or voltage measuring device.
Source: selected by the editor from original sources.

Invention: Crack detector and heating circuit for motor vehicle headlight light transmissive shield