초록 ▼

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 hei

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.

대표청구항 ▼

1. An alignment device for a vehicle comprising:vehicle attitude detecting means for detecting an attitude of a vehicle and then outputting an analog vehicle attitude detecting signal; analog-to-digital conversion means for converting the analog vehicle attitude detecting signal to a digital signal;

1. An alignment device for a vehicle comprising:vehicle attitude detecting means for detecting an attitude of a vehicle and then outputting an analog vehicle attitude detecting signal; analog-to-digital conversion means for converting the analog vehicle attitude detecting signal to a digital signal; operation means for executing an alignment operation in accordance with the digital signal and outputting an alignment command signal having a pulse duration modulated according to this operation result; switching means which responds to the alignment command signal upon reception of a supply of electric power from a vehicle power supply to perform a switching operation and for generating a switching signal according to this switching operation; filter means for smoothing the switching signal according to the switching operation and for generating an output signal; position detecting means for detecting the position of an optical axis upon reception of electric power from the vehicle power supply and for generating a detection output; alignment signal generating means which generates an alignment signal corresponding to the deviation between the output signal of the filter means and the detection output of the position detecting means; and alignment means for aligning the optical axis in response to the alignment signal.