US4612592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual coil/dual magnet actuator
Assignee: Unisys Corp
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Filing: 1979-12-26
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Granted: 1986-09-16
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Expires: 1999-12-26
Abstract
Abstract An improved linear actuator for reciprocating a read/write head mechanism relative to magnetic disk storage system is disclosed, including a second, supplemental solenoid coil and associated magnet means in addition to the usual arrangement, and by way of improving linearity and efficiency.
Inventors
- 👤 Jorgen Frandsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:28
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; H; H02; H02K; H02K41/00; H02K41/02; H02K41/035; H02K41/0352; H02K41/0354; H02K41/0356
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A "paired coil" actuator wherein at least one pair of like solenoid coil means is arranged on a reciprocatable support means so as to be controllably energized by current supply means and generate oppositely-directed electromagnetic fields and wherein magnet means is disposed operatively adjacent each such coil means and adapted to electromagnetically interact therewith to induce translation of the support means along a prescribed path.
Claim 2
Dependent Claim
65 words
A "paired coil" actuator wherein at least one pair of like solenoid coil means is arranged on a reciprocatable support means so as to be controllably energized by current supply means and generate oppositely-directed electromagnetic fields and wherein magnet means is disposed operatively adjacent each such coil means and adapted to electromagnetically interact therewith to induce translation of the support means along a prescribed path.
Claim 3
Dependent Claim
24 words
The combination as recited in claim 1 wherein the magnet means comprises an array of like permanent magnet rings and associated low-reluctance mounting means.
Claim 4
Dependent Claim
34 words
The combination as recited in claim 2 wherein the rings are mounted in abutment and fashioned to have a length dimension, along said path, approximating the sum of coil width and inter-coil separation distance.
Claim 5
Dependent Claim
33 words
The combination as recited in claim 3 wherein the support means and "paired coil" actuator are adapted to controllably reciprocate magnetic read/write means to position it with respect to associated magnetic recording media.
Claim 6
Dependent Claim
16 words
A combination as recited in claim 4 as adapted for head positioning in a disk drive.
Claim 7
Dependent Claim
100 words
A "dual coil" linear actuator adapted for head positioning in a disk drive wherein one or more pair of coil means is arranged to reciprocate along a prescribed path as energized by associated electrical means thus associated magnetic means operatively disposed along said path in flux coupling relationship with each said coil means, each magnet means being adapted to electromagnetically interact with an associated pair of coil means to induce translation thereof along said path, the coil means in turn being arranged and controlled to generate oppositely-directed electromagnetic fields to enhance reciprocation along said path in a prescribed controlled manner.
Claim 8
Dependent Claim
100 words
A "dual coil" linear actuator adapted for head positioning in a disk drive wherein one or more pair of coil means is arranged to reciprocate along a prescribed path as energized by associated electrical means thus associated magnetic means operatively disposed along said path in flux coupling relationship with each said coil means, each magnet means being adapted to electromagnetically interact with an associated pair of coil means to induce translation thereof along said path, the coil means in turn being arranged and controlled to generate oppositely-directed electromagnetic fields to enhance reciprocation along said path in a prescribed controlled manner.
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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) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |