| CPC G02B 7/09 (2013.01) [G03B 13/36 (2013.01)] | 5 Claims |
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1. A method for controlling an autofocus actuator based on a capacitance measured between a rotor plate attached to a rotor and a stator plate attached to a stator in the autofocus actuator, and the method comprising:
determining, at an autofocus sensor, a predetermined distance and a predetermined direction for moving the rotor in an image autofocus process;
determining, at a processing unit, a desired capacitance value between the rotor plate and the stator plate corresponding to the predetermined distance and the predetermined direction; and
until the measured capacitance value matches the desired capacitance value;
measuring, at a capacitance sensing circuit, a capacitance between the rotor plate and the stator plate;
determining, at the processing unit, whether the measured capacitance value matches the desired capacitance value; and
lineally moving, at a rotor drive block, the rotor in the direction.
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