Crack detector and heating circuit for motor vehicle headlight l

Details Crack detector and heating circuit for motor vehicle headlight l Crack detector and heating circuit for motor vehicle headlight l

1991-05-13

1993-01-26

Reynolds, Bruce A.

Electric heating

Heating devices

Combined with diverse-type art device

219203, 362 61, 340655, 315 82, 315116, 307 108, H05B 4129, H05B 102, F21M 700, B60S 156

Patent

active

051824329

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.

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patent: 5086212 (1992-02-01), Itakura et al.
patent: 5095336 (1992-03-01), Corona et al.

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