Irradiation apparatus

An irradiation apparatus, comprising:

• a light source;
• a light deflector including a mirror unit which reciprocatively rotates around a rotation axial line and reflects an incident light from the light source to radiate a scanning light, and a piezoelectric actuator having a plurality of piezoelectric cantilevers serially connected in a meandering pattern arrangement, the piezoelectric actuator being configured to actuate the piezoelectric cantilevers with a driving voltage supplied from outside to cause the mirror unit to reciprocatively rotate around the rotation axial line;
• a drawing area designating unit which designates a designated drawing area, scanned by the scanning light, among a standard drawing area, a first partial drawing area and a second partial drawing area, the first partial drawing area and the second partial drawing area being located inside the standard drawing area in different positions;
• a light source control unit which controls the brightness of the light source according to the designated drawing area;
• and
• a driving voltage control unit which controls combinations of operating piezoelectric cantilevers supplied with the driving voltage and suspended piezoelectric cantilevers not supplied with the driving voltage, the combinations including:
• a standard combination, corresponding to the standard drawing area, of both one and the other parts of the plurality of piezoelectric cantilevers being the operating piezoelectric cantilevers;
• a first combination, corresponding to the first partial drawing area, of the one and the other parts being the operating and the suspending piezoelectric cantilevers respectively;
• and a second combination of the one and the other parts being the suspending and the operating piezoelectric cantilevers respectively.