Patent ID: 8400698

Claim:
An oscillator device, comprising: an oscillating system having a first oscillator, a second oscillator, a first torsion spring for connecting the first and second oscillators to each other, and a second torsion spring connected to the second oscillator and having a common torsional axis with the first torsion spring; a supporting system for supporting the oscillating system; a driving system for driving the oscillating system so that the first oscillator produces oscillation as can be expressed by an equation that contains at least a term A 1 sin(ω t )+ A 2 sin( nωt +ø) where n is an integer not less than 2, A 1 is an amplitude of oscillation of the first oscillator, A 2 is an amplitude of oscillation of the second oscillator, ω is an angular frequency of the oscillation of the first oscillator, nω is an angular frequency of the oscillation of the second oscillator, ø is a phase difference between the oscillation of the first oscillator and the oscillation of the second oscillator, and t is time; a signal producing system for producing an output signal at first and second displacement angles smaller than a maximum displacement angle of the first oscillator; and a drive control system for controlling the driving system on the basis of the output signal of the signal producing system so that at least one of A 1 , A 2 and ø in the aforementioned equation takes a predetermined value, wherein the first oscillator is arranged for displacement beyond the first and second displacement angles, wherein the output signal of the signal producing system contains mutually different first and second moments of time information as the first displacement angle is reached, and contains mutually different third and fourth moments of time information as the second displacement angle is reached, and wherein the drive control system controls the driving system on the basis of the first to fourth moments of time information so that at least one of A 1 , A 2 and ø takes the predetermined value.