Alignment device for a vehicle

摘要

A device for aligning an optical axis of a light source according to the change of attitude of a vehicle is described. The device is of simple construction and is positionally accurate. In an embodiment, a controller 18 performs an alignment operation according to an output signal from a vehicle height sensor 10 and an alignment command signal (PWM signal). The PWM signal has a pulse duration that has been modulated according to this operation, and the result is input to a D/A converter 20. A transistor Q of a D/A converter 20 responds to the PWM signal and performs a switching operation, and a signal accompanying this switching operation is smoothed by a charge and discharge circuit comprising resistance R1 and R2, and a condenser C. The smoothed signal is output from both ends of the condenser C to an actuator 14, and a motor 26 is driven to rotate according to the deviation between the output of a potentiometer 24 and the voltages at both ends of the condenser C.