Patent ID: 7423795

Claim:
An optical deflector, comprising: an oscillating system; and a driving system configured to drive said oscillating system; wherein said oscillating system includes a first oscillator, a first torsion spring, a second oscillator, a second torsion spring and a supporting member, wherein said first oscillator includes a first movable element having a light deflecting element configured to deflect light, wherein said second oscillator includes a second movable element having a mass adjusting member configured to adjust a mass, wherein said first movable element is resiliently supported by said second movable element through said first torsion spring, for torsional oscillation about an oscillation axis, wherein said second movable element is resiliently supported by said supporting member through said second torsional spring, for torsional oscillation about the oscillation axis, and wherein said oscillating system has at least two natural oscillation modes having different frequencies, about the oscillation axis.