Patent US3896494A successfully refreshed from Google Patents.
US3896494A
Expired / Lapsed
US
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Air bearing head support device for multi-channel disc memory apparatus
Assignee: Hitachi Ltd
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Filing: 1974-01-15
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Granted: 1975-07-22
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Expires: 1994-01-15
Abstract
Abstract An air bearing head support device in multi-channel memory apparatus for recording and reproducing wideband information such as video signals on a magnetic disc, using a plurality of magnetic head assemblies or transducers. A head assembly supports at least two magnetic head cores sweeping the disc along alternate channel tracks. The other head assembly supports at least two magnetic head cores sweeping the disc along channel tracks between said alternate channel tracks. These plural head assemblies are attached to a common plate so that rotation trajectories produced on the disc by the magnetic head cores in the head assemblies at the time of the rotation of the disc do not overlap each other.
Inventors
- 👤 Teizo Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:45
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005; G11B5/49; G11B5/4907
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
387 words
An air bearing head support device for multi-channel disc memory apparatus comprising: a rotatable magnetic storage disc; a fixedly mounted support plate spaced above said disc; at least three head base-plates, each base-plate having a downwardly bent portion and a hollow head-base cylinder extending toward said disc, respectively, each of said baseplates being connected to said support plate at three positions defined by apexes of a triangle having at least two equal sides by three indepdendently adjustable members, whereby each of said base-plates is adjustable in position and distance with respect to said support plate; at least three core holders, each of said core holders being connected to a respective base-plate by a leaf-spring, said leaf-spring having one end connected to said core holder and another end connected to the downwardly bent portion of said base-plate, each core holder having three head cores at positions thereon defined by apexes of a triangle having at least two equal sides, a first and a second core holder being arranged in a pair so that at the time of rotation of the disc the rotation trajectories on the disc produced by the head cores on the first core holder and the head cores on the second core holder are alternately positioned, a third core holder being arranged so that mutually adjacent rotation trajectories on the disc produced by a head core of the third core holder and a head core of one of the first and second core holders are separated by a distance larger than that of mutually adjacent rotation trajectories on the disc produced by the head cores of one of thE first, second and third core holders; and a coil spring and an adjusting element accommodated within the hollow head-base cylinder of each base-plate, said coil spring having a downwardly extending lower end connected to the core holder at the point of gravity of the triangle of the head cores and an upper end connected to the adjusting element, the adjusting element being adjustably mounted to the base-plate at the point of gravity of the triangle of the independently adjustable members, whereby each core holder is maintained apart from an coplanar to the disc surface by at least a portion of the leaf-spring, the coil spring and air bearing force produced due to rotation of the disc.
Claim 2
Dependent Claim
387 words
An air bearing head support device for multi-channel disc memory apparatus comprising: a rotatable magnetic storage disc; a fixedly mounted support plate spaced above said disc; at least three head base-plates, each base-plate having a downwardly bent portion and a hollow head-base cylinder extending toward said disc, respectively, each of said baseplates being connected to said support plate at three positions defined by apexes of a triangle having at least two equal sides by three indepdendently adjustable members, whereby each of said base-plates is adjustable in position and distance with respect to said support plate; at least three core holders, each of said core holders being connected to a respective base-plate by a leaf-spring, said leaf-spring having one end connected to said core holder and another end connected to the downwardly bent portion of said base-plate, each core holder having three head cores at positions thereon defined by apexes of a triangle having at least two equal sides, a first and a second core holder being arranged in a pair so that at the time of rotation of the disc the rotation trajectories on the disc produced by the head cores on the first core holder and the head cores on the second core holder are alternately positioned, a third core holder being arranged so that mutually adjacent rotation trajectories on the disc produced by a head core of the third core holder and a head core of one of the first and second core holders are separated by a distance larger than that of mutually adjacent rotation trajectories on the disc produced by the head cores of one of thE first, second and third core holders; and a coil spring and an adjusting element accommodated within the hollow head-base cylinder of each base-plate, said coil spring having a downwardly extending lower end connected to the core holder at the point of gravity of the triangle of the head cores and an upper end connected to the adjusting element, the adjusting element being adjustably mounted to the base-plate at the point of gravity of the triangle of the independently adjustable members, whereby each core holder is maintained apart from an coplanar to the disc surface by at least a portion of the leaf-spring, the coil spring and air bearing force produced due to rotation of the disc.
Claim 3
Dependent Claim
43 words
A head support device according to claim 1, wherein said adjusting element includes a screw member threadedly engaged with the head base-plate and movable in relation thereto so as to provide a variable pressing force to the upper end of said coil spring.
Claim 4
Dependent Claim
32 words
A head support device according to claim 1, wherein said three head cores are three active magnetic cores at positions corresponding to the three apexes of the triangle on said core holder.
Claim 5
Dependent Claim
106 words
A head support device according to claim 1, wherein the apexes of the triangle on the head base-plate are spaced apart a greater distance than the apexes of the triangle on the core holder, said three independently adjustable members being three spring biased screw elements extending through respective holes in the head base-plate at the three positions defined by the apexes of the triangle and corresponding holes in the support plate, the spring of each screw being arranged between the support plate and the base-plate, whereby an adjustment of the vertical position and inclination of the head base-plate with respect to the support plate is provided.
Claim 6
Dependent Claim
39 words
A head support device according to claim 4, wherein the holes in the head base-plate are slots extending radially of the disc, whereby a precise adjustment of the head cores in relation to the corresponding disc locations is provided.
Claim 7
Dependent Claim
92 words
A head support device according to claim 1, wherein said three head cores on one of said core holders are three active magnetic cores positioned at locations corresponding to the three apexes of the triangle of said one core holder and the three head cores of another core holder includes two active magnetic cores positioned at locations corresponding to two apexes of the triangle on said other core holder and a dummy head core member being positioned at the location of the remaining apex of the triangle on said other core holder.
Claim 8
Dependent Claim
26 words
A head support device according to claim 6, wherein said dummy head core member is formed of the same material as the active magnetic head cores.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |