Patent ID: 9049366
Filing Date: 2015-06-02
Classification: G03B

Abstract:
1. A device for driving an under damped voice coil motor (VCM) actuator of a camera lens, comprising: a first generator operable to read a first manufacture data from an image signal processor (ISP) and to generate a half natural period, ½ T a second generator operable to read a second manufacture data from the ISP and to generate the maximum overshoot, K, of the VCM actuator by selecting a value approximate to the second data in a second table of the device, an input shaping signal generator operable to read an input signal corresponding to a desired camera lens moving distance from the ISP and to generate a shaping signal according to the value of the half natural period and the maximum overshoot value; wherein the shaping signal is a function selected from the group consisting of wherein A i is the amplitude component and t i is the time component of the shaping function, T d is the natural period and K≠1; the driving device further comprising a digital to analog converter and a buffer amplifier, wherein the digital to analog converter and buffer amplifier convert the shaping signal to the current required for a VCM actuator to drive the camera lens to a desired distance.