US4590529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carriage device for moving and positioning magnetic head
Assignee: Citizen Watch Co Ltd
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Filing: 1984-03-07
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Granted: 1986-05-20
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Expires: 2004-03-07
Abstract
Abstract A carriage device used for moving and positioning a magnetic head opposite prescribed tracks of a magnetic disk has the magnetic head mounted on a carriage which has linear motor mechanisms built integrally therein. The linear motor mechanisms incorporate coils secured to part of the carriage and permanent magnets secured aorund the coils. Guide rails serving to support the carriage within the range of the sliding motion of the coils are made of a magnetic substance.
Inventors
- 👤 Akira Nikaido
- 👤 Takayasu Machida
- 👤 Yasuhisa Hirosawa
- 👤 Fumio Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:17
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
A carriage device for moving and positioning a magnetic head opposite a prescribed track of a magnetic disk, comprising guide rails formed at least partly of a magnetic substance and secured to a base plate, a carriage having mounted thereon a magnetic head and being slidably supported on said guide rails, coils forming part of said carriage and disposed around the portions of the guide rails made of a magnetic substance, magnetic yokes magnetically linked with said magnetic portions of the guide rail and secured to said base plate, and permanent magnets secured to said magnetic yokes and opposed across a gap to said coils.
Claim 2
Dependent Claim
105 words
A carriage device for moving and positioning a magnetic head opposite a prescribed track of a magnetic disk, comprising guide rails formed at least partly of a magnetic substance and secured to a base plate, a carriage having mounted thereon a magnetic head and being slidably supported on said guide rails, coils forming part of said carriage and disposed around the portions of the guide rails made of a magnetic substance, magnetic yokes magnetically linked with said magnetic portions of the guide rail and secured to said base plate, and permanent magnets secured to said magnetic yokes and opposed across a gap to said coils.
Claim 3
Dependent Claim
35 words
A carriage device according to claim 1, wherein said permanent magnets are a pair of permanent magnets disposed one on either side of said coils with the poles of like sign opposed to each other.
Claim 4
Dependent Claim
32 words
A carriage device according to claim 1, wherein said guide rails are a pair of guide rails of a magnetic substance disposed parallelly to each other and secured on said base plate.
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) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |