Patent ID: 7280448
Filing Date: 2007-10-09
Classification: G05B,G11B

Abstract:
1. A positioning control device which positions a moving member so that the moving member follows an objective member which almost equally repeats a position shift with substantially constant period, the device comprising: a position detecting unit which measures a relative position error between a desired position of the objective member and the moving member; a first adding unit which adds a position error signal output from the position detecting unit and a delay signal; a signal delay unit which outputs the delay signal which is obtained by delaying an output of the first adding unit at a time corresponding to said substantially constant period; a filter having a predetermined frequency characteristic in a specific frequency range, wherein the filter outputs a filtered delay signal; a second adding unit which adds the position error signal, the delay signal and the filtered delay signal; and a drive unit which moves the moving member based on a signal output from the second adding unit.