The present disclosure provides one embodiment of an integrated circuit method. Due to their high impurity content fine particle size, cementetious nature, and high degree of particle aggregation, hard kaolins are difficult to process. The drive control part is configured to control the generator based on the deviation between the detected voltage value and a voltage command value. A first electrically conductive sheet is spaced an axial distance away from the second electrically conductive sheet wherein at least a portion of the register body is sandwiched between the first electrically conductive sheet and the second electrically conductive sheet.