Patent US1538225A successfully refreshed from Google Patents.
EP0020177A1
Expired / Lapsed
EP
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Fixed disc head actuator assembly
Assignee: MICROCOMPUTER SYSTEMS CORP
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Filing: 1980-06-03
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Granted: —
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Expires: 2000-06-03
Abstract
Abstract An actuator assembly for magnetic heads used with fixed magnetic discs. The heads 14 are supported from one end 13 of arms 11 in a support assembly which is pivoted at the other end. Drive forces are applied directly to each of the arms through the support assembly at the center of percussion between the pivot and the heads. Drive forces are generated by a drive assembly including a coil 32 and permanent magnets 43, 44.
Inventors
- 👤 Paul A. Gilovich
- 👤 Joseph S-T. Tung
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 13:32
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/035; H02K41/0352; H02K41/0354; H02K41/0358; G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
A head actuator assembly for fixed disc memories comprising a pivot assembly, a head support including a plurality of arms adapted to support heads extending from said pivot assembly for cooperation with said disc, coil support means extending outwardly from said head support, a coil wound on said coil support means, and means including at least one permanent magnet providing a magnetic field in which said coil may move in a direction to cause said coil support to move to rotate said head support about said pivot assembly whereby when said coil is energized it provides a motive force to the head support to drive the arms and position the associated heads with respect to the disc.
Claim 2
Dependent Claim
117 words
A head actuator assembly for fixed disc memories comprising a pivot assembly, a head support including a plurality of arms adapted to support heads extending from said pivot assembly for cooperation with said disc, coil support means extending outwardly from said head support, a coil wound on said coil support means, and means including at least one permanent magnet providing a magnetic field in which said coil may move in a direction to cause said coil support to move to rotate said head support about said pivot assembly whereby when said coil is energized it provides a motive force to the head support to drive the arms and position the associated heads with respect to the disc.
Claim 3
Dependent Claim
30 words
A head actuator as in Claim 1 in which said coil support extends outwardly opposite each of said arms whereby the motive force is applied opposite each of said arms.
Claim 4
Dependent Claim
22 words
A head actuator as in Claim 1 wherein said head supports are engaged by the coil support at their center of percussion.
Claim 5
Dependent Claim
92 words
A head actuator as in Claim 1 in which said means providing a magnetic field includes a pair of spaced permanent magnets, magnetic means associated with each of said magnets forming a first magnetic pole for each of said magnets, second magnetic means associated with each of said magnets forming a second magnetic pole for each of said magnets spaced from the first magnetic pole of each of said magnets to form a pair of spaced gaps, said coil being supported to move in said gap and surround the second magnetic means.
Claim 6
Dependent Claim
30 words
A head actuator as in Claim 4 including low reluctance means providing paths between said second magnetic means and each of said paths and serving to minimize leakage magnetic fields.
Claim 7
Dependent Claim
86 words
A head as in Claim 1 in which said coil support includes a web member extending outwardly from and opposite each of said arms, and said permanent magnet includes a pair of permanent magnets and pole pieces defining a pair of spaced magnetic gaps with magnetic fields extending across said gaps, said means being positioned to receive said coil in said gaps whereby when current is applied to said coil it is moved in said gap and forces said web to drive said arms and heads.
Claim 8
Dependent Claim
19 words
An actuator as in Claim 6 in which said web engages said arms support at the center of percussion.
Claim 9
Dependent Claim
24 words
An actuator as in Claim 6 including low reluctance magnetic material providing a magnetic path between said pole pieces and reducing stray magnetic flux.
References Cited (Backward Citations)
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