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US5260618A
Expired / Lapsed
US
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Space optimization voice coil motor for disc drives
Assignee: Seagate Technology LLC
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Filing: 1991-11-25
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Granted: 1993-11-09
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Expires: 2011-11-25
Abstract
Abstract The present invention is directed to the structure of the permanent pole pieces, the permanent magnets and the bobbin of a voice coil motor. The poles, poles and permanent magnet(s) or poles, permanent magnets or any combination thereof are shaped in such a manner as to provide as large and constant magnetic flux field strength over a given area. The shaping of the components of the voice coil motor results in an altered external geometrical shape of the voice coil motor envelope, a reduced envelope for a motor of a given torque capability or both. The shaping of the poles, permanent magnets or bobbin allows the voice coil motor to consume less room within the disk drive housing.
Inventors
- 👤 John C. Dunfield
- 👤 Gunter Heine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:06
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/035; H02K41/0352; H02K41/0354; H02K41/0358; G; G11; G11B; G11B21/00; G11B21/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
48 words
A flat voice coil motor comprising: a pole piece; a magnet associated with and having a side opposite said pole piece; said side of said magnet defining a protrusion extending about a magnetic pole transition center line; and a voice coil positioned proximate the protrusion of said magnet.
Claim 2
Dependent Claim
48 words
A flat voice coil motor comprising: a pole piece; a magnet associated with and having a side opposite said pole piece; said side of said magnet defining a protrusion extending about a magnetic pole transition center line; and a voice coil positioned proximate the protrusion of said magnet.
Claim 3
Dependent Claim
23 words
The voice coil motor of claim 1 wherein said voice coil includes one or more constricted dimensions proximate the protrusion of said magnet.
Claim 4
Dependent Claim
13 words
The voice coil motor of claim 1 having a plurality of pole pieces.
Claim 5
Dependent Claim
23 words
The voice coil motor of claim 3 having a plurality of opposing magnets each associated with a respective one of said pole pieces.
Claim 6
Dependent Claim
63 words
A voice coil motor having a magnetic flux path which includes an air gap wherein adjoining areas of oppositely directed magnetic flux define a magnetic pole transition line, the motor comprising: a pole piece; a magnet associated with said pole piece; and a voice coil positioned in the air gap; said pole piece having increased cross section proximate the magnetic pole transition line.
Claim 7
Dependent Claim
63 words
A voice coil motor having a magnetic flux path which includes an air gap wherein adjoining areas of oppositely directed magnetic flux define a magnetic pole transition line, the motor comprising: a pole piece; a magnet associated with said pole piece; and a voice coil positioned in the air gap; said pole piece having increased cross section proximate the magnetic pole transition line.
Claim 8
Dependent Claim
24 words
The voice coil motor of claim 5 wherein said magnet and said pole piece define a combined structure having a substantially rectangular cross section.
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) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |