Actuator drive device

摘要

An actuator drive device is configured to drive an actuator. The actuator drive device includes a storage section for storing a drive condition of the actuator, a processor for calculating and outputting drive signal D(t) based on a drive base signal V(t) calculated based on the drive condition with respect to time t, and a generator for outputting, based on the drive signal D(t) calculated, a driving signal for driving the actuator. The drive base signal V(t) is a sum of a fundamental wave and at least one harmonic wave of the fundamental wave. The processor is operable to determine the coefficient ak such that the drive base signal V(t) changes linearly from a minimum value to a maximum value with respect to a time. This actuator drive device improves the linearity of the driving of the actuator.

主权项

1. An actuator drive device configured to drive an actuator which includes a driver and a drive electrode, said actuator drive device comprising:
a storage section for storing a drive condition of the actuator; a processor for calculating and outputting drive signal D(t) based on a drive base signal V(t) calculated based on the drive condition with respect to time t; and a generator for outputting, based on the drive signal D(t) calculated, a driving signal to the drive electrode of the actuator for driving the driver of the actuator, wherein the actuator drive device is configured to drive the actuator in a main mode while not exciting the actuator in a mode different from the main mode, wherein the drive base signal V(t) is a sum of a fundamental wave and at least one harmonic wave of the fundamental wave, and is expressed as:V⁡(t)=A⁢∑k=1N⁢ak⁢sin⁡(2⁢π⁢⁢fbase⁢kt), with an amplitude A, an integer N, a coefficient ak, a frequency fbase of the fundamental wave, and an integer k (1≦k≦N), wherein frequencies of the fundamental wave and the at least one harmonic wave of the fundamental wave includes a resonance frequency f0 of the main mode, wherein the mode, different from the main mode, is excited with a vibration at a resonance frequency f1, wherein an upper limit frequency out of the frequencies of the fundamental wave and the at least one harmonic wave of the fundamental wave is a frequency fBW, wherein a frequency kfbase of a harmonic wave out of the at least one harmonic wave at any order k is included within a range of fbase≦kfbase≦fBW≦f1, and wherein the processor is operable to determine the coefficient ak such that the drive base signal V(t) changes linearly from a minimum value to a maximum value with respect to a time.