Patent US4490766A successfully refreshed from Google Patents.
US4490766A
Expired / Lapsed
US
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Magnetic recording disk cleaning using controlled actuator motion
Assignee: International Business Machines Corp
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Filing: 1982-03-22
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Granted: 1984-12-25
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Expires: 2002-03-22
Abstract
Abstract In a magnetic recording disk file employing a transducing slider which is closely spaced from the disk surface and has side rail members extending in the direction of disk motion and tapered portions at the leading edge, the disk may be cleaned of contaminant particles by moving the slider in increments from the outside disk diameter to the inside diameter, so that the particles first encounter the slider/inner side rail and are swept away, rather than first encountering the tapered portions and being wedged into the magnetic coating.
Inventors
- 👤 Murray K. Hill
- 👤 William H. McConnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:21
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005; G11B23/00; G11B23/50; G11B23/505
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
241 words
A method of cleaning contaminants from the magnetic recording surface of a rotating magnetic disk having recording tracks therein with an air bearing magnetic slider of the type comprising a tapered leading portion that is joined to a non-tapered longitudinally extending side rail having a magnetic transducer mounted on its trailing edge, said method comprising the steps of: positioning said slider closely adjacent said recording surface with said transducer substantially radially aligned with said disk, and with the leading edge of said leading portion slightly skewed relative to the center of the disk and slightly farther away from the center of the disk than said trailing edge, moving said slider in a radial direction while maintaining said transducer radially aligned with said surface, such radial movement being incremental and halted after each increment of movement for a period of time at least equal to the time of one revolution of said disk surface, said increments not exceeding a distance X, and the point at which said tapered leading portion joins said side rail being offset outwardly from the center of said disk said distance X relative to said trailing edge, the rate of such incremental movement being slow enough in relation to the rotational velocity of said disk as to insure that the longitudinally extending side of said side rail encounters and dislodges said contaminants from said surface before said contaminants can encounter and become wedged under said tapered leading portion.
Claim 2
Independent Claim
241 words
A method of cleaning contaminants from the magnetic recording surface of a rotating magnetic disk having recording tracks therein with an air bearing magnetic slider of the type comprising a tapered leading portion that is joined to a non-tapered longitudinally extending side rail having a magnetic transducer mounted on its trailing edge, said method comprising the steps of: positioning said slider closely adjacent said recording surface with said transducer substantially radially aligned with said disk, and with the leading edge of said leading portion slightly skewed relative to the center of the disk and slightly farther away from the center of the disk than said trailing edge, moving said slider in a radial direction while maintaining said transducer radially aligned with said surface, such radial movement being incremental and halted after each increment of movement for a period of time at least equal to the time of one revolution of said disk surface, said increments not exceeding a distance X, and the point at which said tapered leading portion joins said side rail being offset outwardly from the center of said disk said distance X relative to said trailing edge, the rate of such incremental movement being slow enough in relation to the rotational velocity of said disk as to insure that the longitudinally extending side of said side rail encounters and dislodges said contaminants from said surface before said contaminants can encounter and become wedged under said tapered leading portion.
Claim 3
Dependent Claim
29 words
A method in accordance with claim 1, wherein, during the moving step, the slider is moved inward in a radial direction over the outermost track to the innermost track.
Claim 4
Dependent Claim
35 words
A method in accordance with claim 1, in which said disk is rotating at 3600 RPM and said radial movement is incremental and is halted after each increment of motion for at least 100 milliseconds.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |