Head flying height measuring device and head flying height measurement method

摘要

PROBLEM TO BE SOLVED: To provide a head levitated quantity measuring device and a head levitated quantity measuring method which can measure an associated quantity with high precision even when a magnetic head slider having a small levitated quantity is measured.;SOLUTION: It is a method of measuring a distance between a disc surface and the slider surface during disc rotation. And an output function of a reflected light detector (luminance gain information G, luminance offset information Offset) is calibrated before the head levitated quantity measurement. In this case, a head levitated quantity zero state is formed in false by filling a refractive index liquid 60 which has the same refractive index as a fixed glass disc between a countered fixed glass disc and the magnetic head slider. And the reflected light intensity I_zero at the zero levitated state is obtained through the reflected light detector, then the gain correction and the offset correction of the output function of the reflected light detector are performed by using this reflected light intensity data I_zero. At the time of the levitated state measurement, the head levitated quantity is back calculated from the reflected light intensity data I of the magnetic head slider on the basis of the calibrated output function.;COPYRIGHT: (C)2005,JPO&NCIPI