公开(公告)号：US5475488A

公开(公告)日：1995-12-12

申请号：US148100

申请日：1993-11-05

申请人： Tadashi Fukuzawa ,  Teiji Hisano ,  Kohichi Ikarugi ,  Tetsuji Morita ,  Kohki Noda

发明人： Tadashi Fukuzawa ,  Teiji Hisano ,  Kohichi Ikarugi ,  Tetsuji Morita ,  Kohki Noda

IPC分类号： G01B9/02 ,  G01B11/14 ,  G01D1/02 ,  G11B21/21

CPC分类号： G01B11/14 ,  G01B9/02007 ,  G11B5/455 ,  G11B5/6052 ,  G01B2290/25

摘要： A high-sensitivity apparatus having simple constitution that measures the flying height of a magnetic head. Light emitted from a white light source 25 is directed to the gap between a disk 23 and a head 21, and subjected to multiple reflection between the disk 23 and the head 21. Reflected light from an opaque object, which may be either the disk 23 or the head 21, is divided into at least three components having respective wavelength regions which are directed to different photodetectors 35, 36, and 37 for the respective wavelength regions. An estimation device 38 estimates the flying height of the head according to the least-square method from the outputs of the photodetectors using functions prepared in advance for the respective wavelength regions, and correlates the disk-head gap and the reflected light intensities detected by the respective photodetectors. Real-time calculation according to the least-square method is performed by means of a table look-up technique or a tracking servo technique.

摘要翻译： 具有测量磁头的飞行高度的简单结构的高灵敏度装置。 从白光源25发射的光被引导到盘23和头21之间的间隙，并且在盘23和头21之间经受多次反射。来自不透明物体的反射光可以是盘23 或头21被分成至少三个分量，其中各个波长区域被引导到各个波长区域的不同的光电探测器35,36和37。 估计装置38使用对于各个波长区域预先准备的功能，根据最小二乘法估计头部的飞行高度与光电检测器的输出之间的关系，并且将磁头间隙和由 各个光电探测器。 根据最小二乘法的实时计算是通过表查找技术或跟踪伺服技术进行的。