A scan mechanism of a ranging apparatus includes a plurality of optical elements, a plurality of motors, and a controller or a plurality of controllers. The plurality of motors correspond to the plurality of optical elements. A motor includes a hollow rotor. An optical element is arranged at the rotor of a corresponding motor. The controller controls the plurality of motors. At least one of the plurality of controllers controls at least two of the plurality of motors. When one controller controls at least two motors, the controller controls the at least two motors to rotate at a predetermined angle difference based on a first synchronization strategy. When one controller controls one motor, the controller controls the motor and another at least one motor to rotate at the predetermined angle difference based on a second synchronization strategy.

Claims data not available