US4450493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head slider and actuator assembly
Assignee: International Business Machines Corp
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Filing: 1981-11-10
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Granted: 1984-05-22
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Expires: 2001-11-10
Abstract
Abstract A magnetic head slider and actuator assembly has an air bearing magnetic head slider that is coupled to an electrical coil. Permanent magnets are positioned in a stationary frame to provide a magnetic field adjacent to the coil. When current is supplied to the coil, it moves within a slot in the frame between the permanent magnets and transports the head slider accordingly. In this way, the magnetic head slider is actuated to access data tracks on a magnetic disk.
Inventors
- 👤 Robert B. Watrous
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:26
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/035; H02K41/0352; H02K41/0354; H02K41/0356; G; G11; G11B; G11B21/00; G11B21/02; G11B5/00; G11B5/48; G11B5/54; G11B5/58; G11B5/60
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
341 words
A magnetic head and actuator assembly for use in transferring information to and from the magnetic surface of a rotating disk of a disk file comprising in combination: an air bearing slider on which said magnetic head is disposed including an air bearing surface for maintaining said magnetic head in a data transferring relationship to said magnetic surface as said slider is moved by said actuator relative to said disk to position said head at selected concentric recording tracks on said magnetic surface; said actuator including a stator and a flat planar armature comprising a planar rectangular bearing element and an energizable flat coil wound on the edge perimeter of said planar bearing element, said rectangular bearing element including a pair of separate continuous air bearing surfaces each disposed adjacent said perimeter to define a shallow air plenum on each of the opposite surfaces of said bearing element, said stator including a channel having a pair of opposed parallel air bearing surfaces which cooperate with said bearing surfaces of said armature to guide the movement of said head along a radial linear path to thereby eliminate any undesirable yaw or tangential motion while allowing movement of said armature within said channel in a role motion around an axis parallel to said disk and said radial direction and in a direction normal to said disk surface to permit said head to follow any flutter of said disk surface; means associated with said stator for establishing a flux field extending normal to and between said parallel air bearing surfaces; means for supplying air to said plenum to maintain said stator and said armature in an air bearing relationship; means for supplying current to said coil to cause movement of said armature relative to said flux field; and means for attaching said slider to said armature to allow said slider to pivot about an axis parallel to said direction of movement in order to follow the surface of said disk while restraining movement of said slider relative to said armature in all other directions.
Claim 2
Dependent Claim
341 words
A magnetic head and actuator assembly for use in transferring information to and from the magnetic surface of a rotating disk of a disk file comprising in combination: an air bearing slider on which said magnetic head is disposed including an air bearing surface for maintaining said magnetic head in a data transferring relationship to said magnetic surface as said slider is moved by said actuator relative to said disk to position said head at selected concentric recording tracks on said magnetic surface; said actuator including a stator and a flat planar armature comprising a planar rectangular bearing element and an energizable flat coil wound on the edge perimeter of said planar bearing element, said rectangular bearing element including a pair of separate continuous air bearing surfaces each disposed adjacent said perimeter to define a shallow air plenum on each of the opposite surfaces of said bearing element, said stator including a channel having a pair of opposed parallel air bearing surfaces which cooperate with said bearing surfaces of said armature to guide the movement of said head along a radial linear path to thereby eliminate any undesirable yaw or tangential motion while allowing movement of said armature within said channel in a role motion around an axis parallel to said disk and said radial direction and in a direction normal to said disk surface to permit said head to follow any flutter of said disk surface; means associated with said stator for establishing a flux field extending normal to and between said parallel air bearing surfaces; means for supplying air to said plenum to maintain said stator and said armature in an air bearing relationship; means for supplying current to said coil to cause movement of said armature relative to said flux field; and means for attaching said slider to said armature to allow said slider to pivot about an axis parallel to said direction of movement in order to follow the surface of said disk while restraining movement of said slider relative to said armature in all other directions.
Claim 3
Dependent Claim
69 words
The invention set forth in claim 1 in which said means for attaching said slider to said armature comprises a pair of cross-spring connectors, each of which comprises a first and second spring strip which are attached between said armature and said slider with said strips being offset relative to each other along said direction of movement to permit only relative pitch motion between said armature and said slider.
Claim 4
Dependent Claim
66 words
The invention set forth in claim 2 in which said means for supplying air to said plenum comprises a pair of air supply passages formed in said stator, one end of each said passage being adapted to be connected to a source of air under pressure and the other end of each said passage being disposed to supply air to a different one of said plenums.
Claim 5
Dependent Claim
35 words
The invention set forth in claim 3 in which said other end of said passage is positioned in said channel at substantially the center of said plenum when said armature is at a home position.
Claim 6
Dependent Claim
66 words
The invention set forth in claim 4 in which said means for establishing a flux field comprises first and second pairs of flat permanent magnets, each pair of said magnets being mounted in said stator with their flat surfaces forming a portion of said air being surface of said channel and being polarized in a direction normal to said flat surfaces to establish said flux field.
Claim 7
Dependent Claim
33 words
The invention set forth in claim 5 in which said disk is in a horizontal plane and said air bearing slider on which said magnetic head is disposed is of the self-loading type.
References Cited (Backward Citations)
US4396966A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |