Control device for vehicle lamp and vehicle lamp system

A vehicle lamp system comprising:

• a vehicle lamp provided in a vehicle and configured to adjust an optical axis thereof;
• an acceleration sensor configured to detect the acceleration of the vehicle;
• and
• a control device configured to control the vehicle lamp, the device comprising:
• a receiver configured to receive an acceleration signal representing an acceleration of the vehicle, from the acceleration sensor, wherein an inclination angle (θ) of the vehicle with respect to a horizontal plane is calculated based on the acceleration signal;
• a controller configured to:
• i) generate a first control signal instructing the vehicle lamp to adjust the optical axis of the vehicle lamp in response to a change of the acceleration signal, when the vehicle has already stopped;
• and
• ii) generate a second signal instructing the vehicle lamp to maintain the optical axis of the vehicle lamp, when the vehicle is traveling on a road surface.