公开(公告)号：JPH06147841A

公开(公告)日：1994-05-27

申请号：JP29700492

申请日：1992-11-06

Applicant: IBM JAPAN

Inventor： MORITA TETSUHARU ,  KUNO TEIJI ,  FUKUZAWA TADASHI ,  ISOGI KOUICHI ,  NODA HIROSHI

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

Abstract: PURPOSE:To provide a floating amount measuring apparatus for head which exhibits high sensitivity through simple structure. CONSTITUTION:Light projected from a white light source 25 is introduced into a gap between a disc 23 and a head 21 where multiple reflection takes place. Light reflected on an opaque body, out of the disc 23 and the head 21, is polarized into at least three wavelength regions and introduced to different optical detecting means 35, 36, 37. An estimating unit 38 estimates floating amount of head from an output of the optical detecting means according to the method of least squares based on a function between disc head gap lengths predetermined for respective wavelength regions and the intensity of reflected light detected through the optical detecting means. Calculation is carried out in real time according to table lookup system or follow-up control system.

公开(公告)号：JPH0827178B2

公开(公告)日：1996-03-21

申请号：JP29700492

申请日：1992-11-06

Applicant: IBM JAPAN

Inventor： MORITA TETSUHARU ,  KUNO TEIJI ,  FUKUZAWA TADASHI ,  ISOKI KOICHI ,  NODA HIROSHI

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