US3975774A
Expired / Lapsed
US
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Method and apparatus for loading flexible magnetic recording discs to transducing heads
Assignee: Nortel Networks Inc
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Filing: 1974-12-04
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Granted: 1976-08-17
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Expires: 1994-12-04
Abstract
Abstract A flexible magnetic recording disc is brought into transducing relation with a recording head by moving a pressure pad against the disc from the side thereof opposite the recording head, and at a point upstream from the latter, in the direction of disc rotation. This resiliently flexes the disc and deviates part of it from its plane of revolution, causing it to partially wrap over the face of the head, in close transducing proximity, without the requirement of a pressure pad on the disc directly opposite the recording head, leaving that area open for other components. In a preferred embodiment, a separate transducing head is used on each side of the flexible disc, in direct alignment with one another, with a similarly-positioned pair of pressure pads disposed upstream, and all are mounted for articulating movement laterally toward and away from the plane of the disc. Means are provided to prevent simultaneous articulation of both such heads toward one another, to preclude crashing the heads against one another through the recording disc disposed therebetween.
Inventors
- 👤 Jan Hendrik Helbers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:31
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/04; G11B17/041; G11B17/022; G11B17/028; G11B17/035; G11B5/00; G11B5/40; G11B5/48; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
162 words
In a recorder/reproducer device, of the type using a flexible disc as the recording media and having a transducer head and a drive hub means engaging the disc centrally and rotating the same in a plane of revolution, the improvement in means for loading the transducer head and the recording disc together in transducing proximity which comprises in combination: means mounting the transducer head in predetermined position in lateral alignment with the surface of said disc and in close proximity to said plane of revolution; means disposed on the opposite side of said disc from said position of said head and locate exclusively in the area extending from the head upstream relative to the direction of rotation of the disc, for exerting a force upon said disc directed toward said head; said force-exerting means located in said area acting to force the disc into transducing proximity with the head even without application of disc-holding force downstream from the position of the head.
Claim 2
Dependent Claim
162 words
In a recorder/reproducer device, of the type using a flexible disc as the recording media and having a transducer head and a drive hub means engaging the disc centrally and rotating the same in a plane of revolution, the improvement in means for loading the transducer head and the recording disc together in transducing proximity which comprises in combination: means mounting the transducer head in predetermined position in lateral alignment with the surface of said disc and in close proximity to said plane of revolution; means disposed on the opposite side of said disc from said position of said head and locate exclusively in the area extending from the head upstream relative to the direction of rotation of the disc, for exerting a force upon said disc directed toward said head; said force-exerting means located in said area acting to force the disc into transducing proximity with the head even without application of disc-holding force downstream from the position of the head.
Claim 3
Dependent Claim
50 words
The improvement recited in claim 1, wherein said means located in said upstream area for extending a holding force upon said disc includes mechanical pressure-applying means, including at least one physically acting against the disc at said upstream location and thereby pushing laterally on said disc at such upstream location.
Claim 4
Dependent Claim
20 words
The improvement of claim 2, wherein said means for exerting a force on said disc includes a resilient pressure pad.
Claim 5
Dependent Claim
49 words
The improvement recited in claim 1, wherein said means for exerting a holding force upon the disc comprises an elongated member disposed generally parallel to the plane of revolution of said disc and means mounting said member selective movement laterally toward and away from the plane of disc revolution.
Claim 6
Dependent Claim
17 words
The improvement of claim 4, wherein said elongated member is oriented on a chord of said disc.
Claim 7
Dependent Claim
58 words
The improvement of claim 1, wherein said disk is of the type comprising a flexible disc-shaped magnetic recording member enclosed within a flexible outer envelope, and wherein said means for exerting a force upon said disc comprises mechanical means for contacting and pushing against said outer envelope to move the latter and thereby move the disc enclosed therewithin.
Claim 8
Dependent Claim
41 words
The improvement of claim 6, wherein said mechanical means for contacting said envelope comprises an elongated member disposed generally parallel to said envelope and means mounting said member for selective movement laterally toward and away from the plane of disc revolution.
Claim 9
Dependent Claim
35 words
The improvement of claim 7, wherein said envelope defines a generally radial opening for access by said head to said disc and wherein said elongated member is disposed adjacent and generally parallel to said opening.
Claim 10
Dependent Claim
14 words
The improvement of claim 8, wherein said elongated member includes a resilient pressure pad.
Claim 11
Independent Claim
95 words
A method of loading a rotating flexible magnetic recording disc and a recording head together for transducing operation therebetween, comprising the steps of applying a lateral force to the disc upstream from the head in the direction of rotation of the disc, said upstream force being in the direction to push the disc toward the head and being of sufficient magnitude to force the disc into transducing proximity with said head at the downstream location of the latter without the application of any further force to the disc at points located downstream from the head.
Claim 12
Independent Claim
95 words
A method of loading a rotating flexible magnetic recording disc and a recording head together for transducing operation therebetween, comprising the steps of applying a lateral force to the disc upstream from the head in the direction of rotation of the disc, said upstream force being in the direction to push the disc toward the head and being of sufficient magnitude to force the disc into transducing proximity with said head at the downstream location of the latter without the application of any further force to the disc at points located downstream from the head.
Claim 13
Dependent Claim
33 words
The method of claim 10, wherein said lateral force produces a flexing distortion of at least a portion of the disc from its normal plane of revolution upstream of, and toward, the head.
Claim 14
Dependent Claim
32 words
The method of claim 11, wherein said disc is maintained in intimately close position to said head by said upstream force without applying further pressure to the disc directly opposite the head.
Claim 15
Dependent Claim
34 words
The method of claim 11, wherein said disc has an outer envelope enclosure, and said upstream force is applied by pushing against the side of said envelope, thereby resiliently flexing both disc and envelope.
Claim 16
Dependent Claim
20 words
The method of claim 13, wherein said force is applied at least in part by using a movably-mounted pressure member.
Claim 17
Dependent Claim
32 words
The method of claim 11, wherein said head is positioned relative to said disc for transducing operation by mounting the head for movement toward and away from the plane of the disc.
Claim 18
Dependent Claim
22 words
The method of claim 15, wherein said lateral force is applied at least in part by using a movably mounted pressure member.
Claim 19
Dependent Claim
34 words
The method of claim 16 wherein said disc has an outer envelope enclosure, and said upstream force is applied by pushing against the side of said envelope, thereby resiliently flexing both disc and envelope.
Claim 20
Independent Claim
133 words
A method of loading a flexible magnetic recording disc to a transducer head for transducing operation therebetween, comprising the steps of rotating said disc to establish a plane of rotation therefor, locating said head so that its face is at least near said plane of rotation, and creating a curving deformation in said disc relative to its plane of rotation and partially about said head by acting on the disc only upstream from the head relative to the direction of rotation of said disc, by placing a pressure member upstream from said head relative to the direction of rotation of said disc and protruding such member at least slightly into said plane of disc rotation at said upstream location from the side of the disc opposite that on which said head is located.
Claim 21
Independent Claim
133 words
A method of loading a flexible magnetic recording disc to a transducer head for transducing operation therebetween, comprising the steps of rotating said disc to establish a plane of rotation therefor, locating said head so that its face is at least near said plane of rotation, and creating a curving deformation in said disc relative to its plane of rotation and partially about said head by acting on the disc only upstream from the head relative to the direction of rotation of said disc, by placing a pressure member upstream from said head relative to the direction of rotation of said disc and protruding such member at least slightly into said plane of disc rotation at said upstream location from the side of the disc opposite that on which said head is located.
Claim 22
Dependent Claim
24 words
The method of claim 18, wherein said transducer head is located with its face projecting at least slightly into said plane of disc rotation.
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) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |