US3939495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for adjusting the angle of attack of a floating magnetic head
Assignee: Hitachi Ltd
•
Filing: 1974-12-16
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Granted: 1976-02-17
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Expires: 1994-12-16
Abstract
Abstract A method whereby the angle of attack formed by a slider acting as a floating magnetic head with respect to a magnetic member can be adjusted. The method includes selecting a speed of rotation of a magnetic member which is lower than the speed of rotation for normal operation of the member while the apparatus is in operation, rotating the member at approximately the preselected lower speed of rotation, and adjusting the angle of attack of the slider so that the slider will begin to float in the air approximately at the preselected lower speed of rotation.
Inventors
- 👤 Hiroshi Nagai
- 👤 Yoshihiko Miyake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:07
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005; G11B5/54
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
A method for adjusting the angle of attack of a floating magnetic head comprising selecting a speed of rotation of a magnetic member which is lower than the speed of rotation for normal operation of the magnetic member while the apparatus is in operation, rotating the magnetic member at approximately the preselected lower speed of rotation, and adjusting the angle of attack of the slider supporting the magnetic head so that the slider begins to float in the air approximately at the preselected lower speed of rotation of the magnetic member.
Claim 2
Independent Claim
91 words
A method for adjusting the angle of attack of a floating magnetic head comprising selecting a speed of rotation of a magnetic member which is lower than the speed of rotation for normal operation of the magnetic member while the apparatus is in operation, rotating the magnetic member at approximately the preselected lower speed of rotation, and adjusting the angle of attack of the slider supporting the magnetic head so that the slider begins to float in the air approximately at the preselected lower speed of rotation of the magnetic member.
Claim 3
Dependent Claim
88 words
A method according to claim 1, wherein the lower speed of rotation is selected in accordance with a predetermined angle of attack and a predetermined desired spacing of the slider from the magnetic member at normal rotational speed of the magnetic member, whereby upon adjusting the angle of attack so that the slider floats in the air at approximately the preselected lower speed of rotation and rotating the magnetic member at the normal rotational speed, the slider becomes spaced approximately the predetermined desired distance from the magnetic member.
Claim 4
Dependent Claim
31 words
A method according to claim 1, wherein the magnetic member is a disc member and adjusting the angle of attack so that the slider floats above the surface of the disc.
Claim 5
Dependent Claim
49 words
A method according to claim 1, wherein the step of adjusting the angle of attack includes placing the slider in contact with the magnetic member and adjusting the angle of attack until the slider loses contact with the magnetic member at approximately the preselected lower speed of rotation thereof.
Claim 6
Independent Claim
128 words
A method for adjusting the angle of attack of a floating magnetic head so as to provide a predetermined spacing of the magnetic head from a rotating magnetic member a the normal rotational speed of the magnetic member comprising the steps of selecting a speed of rotation of the magnetic member which is lower than the normal speed of rotation thereof, rotating the magnetic member at approximately the preselected lower speed of rotation, and adjusting the angle of attack of the slider supporting the magnetic head so that the slider begins to float in the air approximately at the preselected lower speed of rotation, whereby upon rotating the magnetic member at the normal rotational speed thereof the slider floats at the desired distance from the rotating magnetic member.
Claim 7
Independent Claim
128 words
A method for adjusting the angle of attack of a floating magnetic head so as to provide a predetermined spacing of the magnetic head from a rotating magnetic member a the normal rotational speed of the magnetic member comprising the steps of selecting a speed of rotation of the magnetic member which is lower than the normal speed of rotation thereof, rotating the magnetic member at approximately the preselected lower speed of rotation, and adjusting the angle of attack of the slider supporting the magnetic head so that the slider begins to float in the air approximately at the preselected lower speed of rotation, whereby upon rotating the magnetic member at the normal rotational speed thereof the slider floats at the desired distance from the rotating magnetic member.
Claim 8
Dependent Claim
55 words
A method according to claim 5, wherein the magnetic member is a magnetic disc and the step of adjusting the angle of attack includes contacting the slider with the surface of the disc and adjusting the angle of attack until the slider loses contact with the disc at approximately the preselected lower speed of rotation.
References Cited (Backward Citations)
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US3720932A
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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) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |