Patent ID: 8270057

Claim:
An oscillator device, comprising: an oscillation system having a plurality of oscillators and a plurality of torsion springs; a driving member configured to drive said oscillation system; a drive control member configured to supply a driving signal to said driving member; a photodetector configured to receive reflection light of a light beam incident on at least one of said plurality of oscillators; and a natural angular frequency calculating member configured to calculate a natural angular frequency of said oscillation system; wherein said oscillation system has at least a first oscillation mode and a second oscillation mode, the second oscillation mode having an angular frequency approximately n-fold the angular frequency of the first oscillation mode where n is an integer, wherein said driving member is configured to drive said oscillation system so that said oscillation system simultaneously oscillates in the first and second oscillation modes, and wherein said natural angular frequency calculating member calculates the natural angular frequency of the second oscillation mode on the basis of an output signal from said photodetector, the output signal being outputted at a timing whereat the reflection light passes over said photodetector while said driving member drives said oscillation system simultaneously in the first and second oscillation modes.