Bulb simultaneous monitoring unit for motor vehicle headlamp - has switching elements for differentiation brightness values

摘要

The photo element (2) is positioned between the main headlamp (1) and the parking light (3), so that the different brightness values of the bulbs can be determined. The photo cell is fitted in the diffusion region of the bulbs being monitored. The evaluation circuit contains switching elements for the differentiation of the different brightness values, and as well as the photo element also the indicating element is connected with one pole (-) to earth. The current supply of the measuring unit is taken direct from the bulbs being monitored. USE/ADVANTAGE - Also for spotlight. Monitoring of several light bulbs with one photo cell. Control light illuminates for short time when full brightness is reached. No control light and either light bulb is defective or monitor system is defective.