Patent ID: 8393085

Claim:
A device that detects a steering angle of a vehicle and controls a deflection of an irradiation direction of a vehicle lamp based on the detected steering angle, the device comprising: a target angle calculating unit that calculates a target angle of the irradiation direction of the vehicle lamp based on the steering angle; a deflection angle calculating unit that calculates a difference angle between the target angle and a current deflection angle, and then calculates a deflection angle of the irradiation direction of the vehicle lamp based on the difference angle; a deflection angle correcting unit that corrects the calculated deflection angle based on a limit angle; a limit angle setting unit that sets the limit angle and outputs the limit angle to the deflection angle correcting unit; and a control unit that controls the deflection of the irradiation direction of the vehicle lamp, based on the calculated deflection angle or the corrected deflection angle, wherein when the difference angle is larger than the limit angle, the deflection angle correcting unit corrects the calculated deflection angle by adding or subtracting the limit angle to or from the current deflection angle.