Light irradiation apparatus and information rewritable system

A light irradiation apparatus comprising:

• an irradiation unit including a light source to irradiate laser light to a process-target object;
• a light source driving circuit to drive the light source;
• a light source controller to control the light source driving circuit to change a light output level of the light source;
• and
• a travelling direction controller to control a travelling direction of the light emitted from the light source depending on an operation mode, and a transition mode that one operation mode is being changed to another mode,
• wherein the travelling direction controller controls the travelling direction of the light during the transition mode to a direction that the light does not irradiate the process-target object.

A light irradiation apparatus comprising:

• an irradiation unit including a light source to irradiate light to a process-target object;
• a light source driving circuit to drive the light source;
• a light source controller to control the light source driving circuit to change a light output level of the light source;
• a light shielding member moveable between a light block position to block the light emitted from the light source at least partially, and a retraction position retracted from the light block position;
• and
• a position controller to control a position of the light shielding member at the light block position during the transition mode.