Patent ID: 8084969
Filing Date: 2011-12-27
Classification: G01D,G02B,G03B,H02K,H02P,H04N

Abstract:
1. A device comprising: a coil driver to drive a coil that when driven effects a linear displacement of a motion device having a magnet; a magnetic field sensor to detect a magnetic field associated with the linear displacement and to produce an output signal in response thereto: an interface, responsive to requests provided by an external controller and corresponding to desired linear displacements of the motion device, to receive a request as a first input and the magnetic field sensor output signal as a second input, and to produce an input signal to the coil driver having a level indicative of a relationship of the second input with respect to the first input; wherein, when the motion device is a lens of a camera, each request comprises a value for a desired travel of the lens; and wherein, when the controller is configured to perform a lens focusing process having a calibration portion and a non-calibrating portion, the requests comprise requests occurring during the calibration portion and requests occurring during the non-calibrating portion.