Abstract: A light source emits a laser light. A driver drives the light source based on a driving signal constituted by a pulse that changes a driving current value. When a luminance corresponding to a first laser output power that exceeds a threshold value is to be expressed, a controller controls the driver to supply to the light source a pulse having a first duty cycle at a first driving current value corresponding to the first laser output power. When a luminance corresponding to a second laser output power that is equal to or less than the threshold value is to be expressed, the controller controls the driver to supply to the light source a pulse having a second duty cycle that is smaller than the first duty cycle at a second driving current value corresponding to a third laser output power that exceeds the threshold value.