| 摘要 |
PURPOSE:To eliminate an insensitive zone and to accurately control positioning by adding/subtracting an indicated value to be applied to an indicating circuit by an amount of the insensitive zone, and correcting to a predetermined current. CONSTITUTION:An indicated value to be applied to an indicating circuit by an amount of an insensitive zone is added or subtracted by an adder/subtracter (correcting circuit) 11 in the insensitive zone to occur due to an irregularity of an element for constituting a driver 14 and the indicating circuit to correct to a predetermined current. Accordingly, a state that an indicated input voltage is present but no load current flows, i.e., the insensitive zone, can be eliminated. Thus, if the indicated value is small, i.e., even when the displacement of a voice coil motor 15 is small and a positional deviation is small, an accurate positioning control can be performed. |
