US3757189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensation for positioning system
Assignee: CENTURY DATA SYSTEMS Inc
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Filing: 1972-12-29
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Granted: 1973-09-04
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Expires: 1992-12-29
Abstract
Abstract The specification discloses an arrangement which compensates for temperature variations in the track positioning system of a rotating magnetic storage device having individual elements which are subjected to different temperatures and environments as a consequence of their physical location.
Inventors
- 👤 W Buchan
- 👤 R Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:07
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/596; G11B5/59627
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
In a disk drive system of the type having a movable head which is servoed to the desired track in accordance with a scale located in an environment which is likely to have a different temperature T1 than the temperature T2 of the disk and head arm, the improvement which comprises: means for generating a first voltage proportional to the track position and the temperature differential between T1 and T2; means for generating a second voltage proportional to track position and the temperature differential between T1 and a reference temperature T3; means for summing said first and second voltages together to provide a correcting signal to said servo whereby said head may be accurately positioned to the desired track irrespective of overall temperature variations or differences in the temperatures T1 and T2.
Claim 2
Dependent Claim
132 words
In a disk drive system of the type having a movable head which is servoed to the desired track in accordance with a scale located in an environment which is likely to have a different temperature T1 than the temperature T2 of the disk and head arm, the improvement which comprises: means for generating a first voltage proportional to the track position and the temperature differential between T1 and T2; means for generating a second voltage proportional to track position and the temperature differential between T1 and a reference temperature T3; means for summing said first and second voltages together to provide a correcting signal to said servo whereby said head may be accurately positioned to the desired track irrespective of overall temperature variations or differences in the temperatures T1 and T2.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |