Fly height measurement for a disc drive

Details Fly height measurement for a disc drive Fly height measurement for a disc drive

2005-05-24

2005-05-24

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

C360S075000

Reexamination Certificate

active

06898034

ABSTRACT:
A method of measuring fly height of a read/write head to form a fly height profile for use in measuring fly height of the read/write head relative to a disc of a disc drive. A fixed source write signal is applied to an inductive element of the read/write head, generating a magnetic flux field with a stray magnetic flux field portion. A magnetoresistive element of the read/write head couples with the magnetic flux field producing an initial field strength signal. As the disc rotates, the read/write head flies there above decreasing the density of the stray magnetic flux field portion thereby decreasing the amplitude of the field strength signal. The decreasing amplitude of the field strength signal is calibrated to a predetermined operating fly height profile to correlate fly height of the read/write head to the decreasing amplitude of the field strength field, which forms the fly height profile.

REFERENCES:
patent: 4954904 (1990-09-01), Goor
patent: 5377058 (1994-12-01), Good et al.
patent: 5638012 (1997-06-01), Hashimoto et al.
patent: 5870250 (1999-02-01), Bolasna et al.
patent: 5995335 (1999-11-01), Jurgenson et al.
patent: 6046596 (2000-04-01), Schaenzer et al.
patent: 6268976 (2001-07-01), Carlson et al.
patent: 6271924 (2001-08-01), Ngoi et al.
patent: 6281676 (2001-08-01), Ottesen et al.
patent: 6312210 (2001-11-01), Lang
patent: 6317814 (2001-11-01), Blendermann et al.
patent: 20010013985 (2001-08-01), Baba et al.
patent: 20010035960 (2001-11-01), Johnston
patent: 20010046108 (2001-11-01), Lewis et al.
patent: 20020039244 (2002-04-01), Wilson
patent: 20020181153 (2002-12-01), Kang

Affiliated with

Also associated with

Rating

Fly height measurement for a disc drive does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fly height measurement for a disc drive, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fly height measurement for a disc drive will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3409674