Patent ID: 6132290
Filing Date: 2000-10-17
Classification: B24B,G11B

Abstract:
An automatic lapping method for lapping a thin film element with a monitoring element having an analog resistance, a value of which is analogously varied and a digital resistance, value of which is digitally varied in a process of lapping the thin film element, comprising the steps of:converting the value of the analog resistance to correspond to a height of the thin film element according to a correlation equation expressing a relationship between the value of the analog resistance and the height of the thin-film element;the step of converting including,differentiating the value of the digital resistance with respect to the value of the analog resistance,detecting off-positions of the digital resistance of the monitoring element according to the differentiated value of the digital resistance;correcting the correlation equation by measured values of the analog resistance on off-timings of the digital resistance;controlling stopping of lapping of the thin film element when the height of said thin-film element reaches a target value.