Patent ID: 7775433

Claim:
An optical deflection apparatus comprising: a light source configured to generate a light beam; an optical deflector including a first oscillator, a second oscillator, a first torsion spring, and a second torsion spring, the first torsion spring connecting the first oscillator and the second oscillator, the second torsion spring being connected to the second oscillator, and the first and second torsion springs sharing a common torsion axis; a driver configured to apply a driving force to the optical deflector; and a driving controller configured to supply a driving signal to the driver; wherein the driving controller is configured (1) to set a reference frequency of the driving signal for driving the optical deflector on the basis of a resonant frequency of the optical deflector, (2) to calculate a target time at which one of the first and second oscillators makes a predetermined deflection angle on the basis of the reference frequency, and (3) to supply such a driving signal that at least one of the first and second oscillators passes through a point corresponding to the predetermined deflection angle at the target time.