Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1982-05-10
1985-08-20
Cardillo, Jr., Raymond F.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
G11B 2110
Patent
active
045368090
ABSTRACT:
A misposition correction system for correcting misposition errors due to spindle runout and other slowly varying errors in a servo positioning system of a magnetic disk storage device. The system includes means for dynamically measuring misposition error with respect to a data track centerline using an anti-aliasing analog filter, means for digitizing the measured analog signal and for removing selected harmonics of the fundamental-frequency of the resulting cyclic error signal, means for transforming the digitized error signal by a matched digital filter whose transfer function contains independently adjustable DC gain, fundamental-frequency gain, and phase lead components thereby to generate a misposition error correction signal that matches the electrical and mechanical response characteristics of the servo system. Further, the system includes means to iteratively refine the correction signal by re-applying it to the servo controller when measuring misposition errors with respect to the data track centerline. The system stores separate misposition correction signals for each transducer on the disk so that one of several correction signals can be selected depending on which transducer in the device is selected. The system further includes means for generating a bias force correction signal to correct for non-linear position errors resulting from variations in bias forces acting on the transducer carriage over its range of radial displacement.
REFERENCES:
patent: 3404392 (1968-10-01), Sordello
patent: 3881184 (1975-05-01), Koepcke et al.
patent: 3994016 (1976-11-01), Moghadam
patent: 4087842 (1978-05-01), Manly
patent: 4135217 (1979-01-01), Jacques et al.
patent: 4136365 (1979-01-01), Chick et al.
patent: 4208679 (1980-06-01), Hertrich
patent: 4371960 (1983-02-01), Kroiss
patent: 4419701 (1983-12-01), Harrison et al.
Patent Abstracts of Japan, V. 3, No. 40, Apr. 6, 1979, p. 152E102 & JP.A-54-19718, "Locating System of High Accuracy".
Patent Abstracts of Japan, V. 4, No. 18, Feb. 13, 1980, p. 75E171 & JP.A-54-158206, "Servo-Information Recorder of Magnetic Disc Memory".
IBM TDB, vol. 19, No. 6, Self-Calibrating Disk Storage Apparatus by Griffths et al.
IBM TDB, vol. 23, No. 2, Track Locating and Following Apparatus for a Flexible Disk File by Jahnke.
Electronics, vol. 55, No. 8, Apr. 21, 1982, D. Sutton, "Winchester Cartridge Challenges Other Backup Systems", pp. 112-116.
Cardillo, Jr. Raymond F.
Digital Equipment Corporation
Garland Steven R.
LandOfFree
Adaptive misposition correcting method and apparatus for magneti does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adaptive misposition correcting method and apparatus for magneti, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive misposition correcting method and apparatus for magneti will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-563940