Patent ID: 7973991

Claim:
An oscillator device with a plurality of oscillators and a plurality of torsion springs, comprising: an oscillation system having a first oscillator, a second oscillator, a first torsion spring configured to connect said first oscillator and said second oscillator to each other, and a second torsion spring connected to said second oscillator and having a torsion axis consistent with a torsion axis of said first torsion spring; a supporting member configured to support said oscillation system; a driving member configured to drive said oscillation system so that at least one of said first oscillator and said second oscillator produces oscillation being expressed by an equation containing a sum of a plurality of periodic functions; a signal output device configured to produce an output signal in accordance with displacement of at least one of said first oscillator and said second oscillator; and a drive control unit configured to control said driving member based on the output signal of said signal output device and by use of a driving signal so that at least one of an amplitude and a phase of the plurality of periodic functions acquires a predetermined value; wherein the driving signal is expressed by an equation containing a sum of a plurality of periodic functions corresponding to the first-mentioned plurality of periodic functions, respectively, wherein said drive control unit includes a driving signal generating circuit configured to generate the driving signal based on a trigonometric function table, wherein said oscillation system is configured to simultaneously produce a first vibrational motion moving with a first frequency which is a fundamental frequency and a second vibrational motion moving with a second frequency which is a frequency integer-fold the fundamental frequency, wherein said driving member is configured to apply a first periodic driving force having the first frequency and a second periodic driving force having the second frequency, wherein the output signal of said signal output device contains first and second, different time entries whereat at least one of said first oscillator and said second oscillator takes a first displacement angle and third and fourth, different time entries whereat said at least one oscillator takes a second displacement angle, and wherein said drive control unit controls said driving member based on the four, first to fourth time entries thereby to control oscillation of at least one of said first oscillator and said second oscillator defined by an amplitude and a relative phase difference of said first vibrational motion and said second vibrational motion.