Patent ID: 7826117

Claim:
A beam irradiation apparatus comprising: a light source which emits a laser beam; a first lens which displaces a traveling direction of the laser beam emitted from the light source toward a direction perpendicular to an optical axis of the laser beam; an actuator which drives the first lens; a second lens which imparts wide angle action to a swing angle of the optical axis, the swing angle being generated by displacing the first lens; a beam dividing element which divides the laser beam passing through the first lens into a first light beam and a second light beam, the first light beam traveling toward the second lens, the second light beam traveling toward a direction different from the first light beam; a position sensor which receives the second light beam divided by the beam dividing element and outputs a signal according to an irradiation position of the laser beam passing through the second lens; and a third lens which is arranged between the position sensor and the beam dividing element to converge the second light beam onto the position sensor.