US3706857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disk cartridge with rotatably adjustable head
Assignee: International Business Machines Corp
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Filing: 1971-01-05
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Granted: 1972-12-19
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Expires: 1991-01-05
Abstract
Abstract A sealed cartridge, low cost disk memory system wherein the disk and the head rotate in parallel planes about offset axes. The disk contains a data band between first and second radii and is rotated about the first axis. The head is mounted for rotation about an axis which is offset from said first axis by at least one half the width of the data band, and less than the width of the data band.
Inventors
- 👤 John J Lynott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:35
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/52; G11B23/00; G11B23/02; G11B23/03; G11B23/032; G11B23/0321; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
145 words
Apparatus for positioning a magnetic transducer in cooperative relationship with a selected one of a plurality of uniquely designated concentric circular recording tracks of a magnetic surface of a disk, comprising motive means operable to rotate said disk about a first axis at a constant speed; cover means for enclosing said disk, mounting means secured to said cover means operable to maintain said magnetic transducer in operative relationship with said magnetic surface of said disk; and accessing means operable to selectively move said magnetic transducer along the circumference of a circle having a second axis parallel and non-colinear to said first axis; said first and second axes being offset by a distance less than the difference, and at least as great as one-half the difference between the radii of the outermost and innermost recording tracks and less than the radius of the innermost recording track.
Claim 2
Dependent Claim
145 words
Apparatus for positioning a magnetic transducer in cooperative relationship with a selected one of a plurality of uniquely designated concentric circular recording tracks of a magnetic surface of a disk, comprising motive means operable to rotate said disk about a first axis at a constant speed; cover means for enclosing said disk, mounting means secured to said cover means operable to maintain said magnetic transducer in operative relationship with said magnetic surface of said disk; and accessing means operable to selectively move said magnetic transducer along the circumference of a circle having a second axis parallel and non-colinear to said first axis; said first and second axes being offset by a distance less than the difference, and at least as great as one-half the difference between the radii of the outermost and innermost recording tracks and less than the radius of the innermost recording track.
Claim 3
Dependent Claim
26 words
The apparatus of claim 1 wherein said accessing means rotates through less than 180* in moving said transducer from the outermost to the innermost recording track.
Claim 4
Dependent Claim
13 words
The apparatus of claim 2 wherein said accessing means comprises a step motor.
Claim 5
Dependent Claim
25 words
The apparatus of claim 3 wherein said accessing means rotates a given angular distance in moving said transducer between any pair of adjacent recording tracks.
Claim 6
Dependent Claim
24 words
The apparatus of claim 3 wherein said stepping motor rotates a variable angular distance to position said transducer over essentially equidistant concentric data tracks.
Claim 7
Dependent Claim
140 words
Apparatus for positioning a magnetic transducer in cooperative relationship with a selected one of a plurality of uniquely designated concentric recording tracks of a magnetic surface of a disk, comprising: a cover; a magnetic transducer mounted to said cover and in operative relationship with said magnetic surface of said disk; motive means for rotating said disk about a first axis at a constant speed; accessing means operable to rotate said cover about a second axis parallel and non-colinear to said first axis for positioning the transducer at said designated recording track, said first and second axes being separated by a distance, said distance being no greater than the difference between the radii of the outermost and innermost concentric recording tracks, being at least as great as one-half said difference, and being less than the radius of the innermost recording track.
Claim 8
Dependent Claim
140 words
Apparatus for positioning a magnetic transducer in cooperative relationship with a selected one of a plurality of uniquely designated concentric recording tracks of a magnetic surface of a disk, comprising: a cover; a magnetic transducer mounted to said cover and in operative relationship with said magnetic surface of said disk; motive means for rotating said disk about a first axis at a constant speed; accessing means operable to rotate said cover about a second axis parallel and non-colinear to said first axis for positioning the transducer at said designated recording track, said first and second axes being separated by a distance, said distance being no greater than the difference between the radii of the outermost and innermost concentric recording tracks, being at least as great as one-half said difference, and being less than the radius of the innermost recording track.
Claim 9
Dependent Claim
22 words
The apparatus of claim 6 further comprising a plurality of transducers mounted in said cover in operative relationship with said magnetic surface.
Claim 10
Dependent Claim
24 words
The apparatus of claim 7 characterized by at least two of said transducers being mounted at different radii with respect to said second axis.
Claim 11
Dependent Claim
31 words
The apparatus of claim 6 wherein the accessing means comprises a stepping motor means for rotating said cover about said second axis and control means for determining the angle of rotation.
Claim 12
Dependent Claim
35 words
The apparatus of claim 9 wherein said stepping motor is moved a fixed number of steps for rotating the cover through a constant angle to move said transducer between any pair of adjacent recording tracks.
Claim 13
Dependent Claim
39 words
The apparatus of claim 9 wherein said control means further comprises means responsive to data read from said recording tracks for moving said stepping motor a variable number of steps to position said transducer over the selected recording track.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |