Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2011-01-25
2011-01-25
Nguyen, Hoa T (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S078040
Reexamination Certificate
active
07876522
ABSTRACT:
A disk drive is disclosed comprising a disk and a head actuated over the disk by a voice coil motor (VCM) comprising a voice coil, wherein the VCM is controlled by a VCM control loop comprising an IR voltage detector. The IR voltage detector is updated by measuring a first back EMF voltage of the voice coil, and after measuring the first back EMF voltage, applying a first control current to the voice coil for a first interval and applying a second control current to the voice coil for a second interval. After the second interval, a second back EMF voltage is measured, and a delta voltage is computed relative to a difference between the first back EMF voltage and the second back EMF voltage. The IR voltage detector is adjusted in response to the delta voltage and at least one of the first and second control currents.
REFERENCES:
patent: 5455723 (1995-10-01), Boutaghou et al.
patent: 5594603 (1997-01-01), Mori et al.
patent: 5768045 (1998-06-01), Patton, III et al.
patent: 5831786 (1998-11-01), Boutaghou et al.
patent: 5936788 (1999-08-01), Boutaghou et al.
patent: 5982130 (1999-11-01), Male
patent: 6025968 (2000-02-01), Albrecht
patent: 6148240 (2000-11-01), Wang et al.
patent: 6396652 (2002-05-01), Kawachi et al.
patent: 6512650 (2003-01-01), Tanner
patent: 6563660 (2003-05-01), Hirano et al.
patent: 6690536 (2004-02-01), Ryan
patent: 6731450 (2004-05-01), Codilian et al.
patent: 6795268 (2004-09-01), Ryan
patent: 6917486 (2005-07-01), Tanner
patent: 6950272 (2005-09-01), Rice et al.
patent: 7009806 (2006-03-01), Zayas et al.
patent: 7042673 (2006-05-01), Jeong
patent: 7072135 (2006-07-01), Suzuki
patent: 7082009 (2006-07-01), Zayas et al.
patent: 7110207 (2006-09-01), Hirano et al.
patent: 7193804 (2007-03-01), Kheymehdooz
patent: 7196863 (2007-03-01), Sakamoto
patent: 7224546 (2007-05-01), Orakcilar et al.
patent: 7243058 (2007-07-01), Du et al.
patent: 7340968 (2008-03-01), Schneider et al.
patent: 7421359 (2008-09-01), Harmer et al.
patent: 7477471 (2009-01-01), Nemshick et al.
patent: 7728539 (2010-06-01), Smith et al.
patent: 7787211 (2010-08-01), Kim et al.
patent: 2001/0019463 (2001-09-01), Drouin
patent: 2003/0161065 (2003-08-01), Yatsu
Calaway Charles J.
Desai Ashok K.
Habermehl James L
Nguyen Hoa T
Western Digital Technologies Inc.
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