US5091808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-motor servo mechanism system for a magnetic disk drive
Assignee: Antek Peripherals Inc
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Filing: 1989-08-07
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Granted: 1992-02-25
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Expires: 2009-08-07
Abstract
Abstract The invention provides an improved disk writing system capable of storing larger amounts of information than heretofore possible. The disk mechanism incorporates a dual function servomechanism which includes a voice coil motor for driving the read/write head over long distances relatively quickly, and a stepper motor for precisely positioning the read/write head once it is in the desired region.
Inventors
- 👤 Anil K. Nigam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; G11B5/5552
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A servomechanism for controlling the position of a head in a disk drive having a base, a carriage assembly and a detector comprising: a head mounted on the carriage assembly for being positioned with respect to media on which information can be stored; a first motor mounted on the base and coupled to the carriage assembly for rapidly moving the carriage assembly along a first axis to position the carriage assembly at a desired location; and a second motor mounted on the base for moving the detector positioned to detect the position of the carriage assembly along the first axis and in response thereto generate a signal to control the first motor.
Claim 2
Dependent Claim
112 words
A servomechanism for controlling the position of a head in a disk drive having a base, a carriage assembly and a detector comprising: a head mounted on the carriage assembly for being positioned with respect to media on which information can be stored; a first motor mounted on the base and coupled to the carriage assembly for rapidly moving the carriage assembly along a first axis to position the carriage assembly at a desired location; and a second motor mounted on the base for moving the detector positioned to detect the position of the carriage assembly along the first axis and in response thereto generate a signal to control the first motor.
Claim 3
Dependent Claim
31 words
A system as in claim 1 further comprising optically readable scale means affixed to the assembly, and wherein the detector includes photosensitive means for detecting the position of the scale means.
Claim 4
Dependent Claim
23 words
A system as in claim 1 wherein: the first motor comprises a voice coil motor; and the second motor comprises a stepper motor.
Claim 5
Dependent Claim
30 words
A system as in claim 3 wherein the stepper motor is coupled to turn a threaded shaft having a nut thereon and wherein the detector is attached to the nut.
Claim 6
Dependent Claim
26 words
A system as in claim 2 wherein the optically readable scale means includes a first scale for fine positioning and a second scale for coarse positioning.
Claim 7
Dependent Claim
21 words
A system as in claim 1 wherein: the head comprises a read/write head; and the media comprises a magnetically writable disk.
Claim 8
Dependent Claim
149 words
A servo mechanism for controlling the position of a read/write head in a magnetic disk drive having a base, a carriage assembly and a detector comprising: a read/write head mounted on the carriage assembly for being positioned with respect to magnetic media on which information can be stored; a voice coil motor mounted on the base and coupled by a shaft to the carriage assembly for rapidly moving the carriage assembly along a first axis to position the carriage assembly at a desired location; a stepper motor mounted on the base for moving the detector positioned to detect the position of the carriage assembly along the first axis and in response thereto generate a signal to control the voice coil motor; and wherein the carriage assembly includes an optically-readable scale affixed to the carriage assembly and wherein the detector includes a photodetector for detecting the position of the scale.
Claim 9
Dependent Claim
149 words
A servo mechanism for controlling the position of a read/write head in a magnetic disk drive having a base, a carriage assembly and a detector comprising: a read/write head mounted on the carriage assembly for being positioned with respect to magnetic media on which information can be stored; a voice coil motor mounted on the base and coupled by a shaft to the carriage assembly for rapidly moving the carriage assembly along a first axis to position the carriage assembly at a desired location; a stepper motor mounted on the base for moving the detector positioned to detect the position of the carriage assembly along the first axis and in response thereto generate a signal to control the voice coil motor; and wherein the carriage assembly includes an optically-readable scale affixed to the carriage assembly and wherein the detector includes a photodetector for detecting the position of the scale.
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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) | 1995-02-24 | 1995-08-26 | 1996-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-24 | 1999-08-26 | 2000-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-24 | 2003-08-26 | 2004-02-25 | $7700.00 | Window Closed / Lapsed |