US3833926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic disc recorder and cassette with compliant recording disc having flexible support means
Assignee: Meritor Inc
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Filing: 1972-11-10
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Granted: 1974-09-03
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Expires: 1992-11-10
Abstract
Abstract A novel magnetic disc recording cassette is provided as a thin polygonal cassette housing containing a disc of flexible magnetic recording media. A drive hub attached to the media is exposed through the cassette and cooperates with a complementary drive hub in a deck which receives the cassette in slot-loading fashion into a carriage which in turn positions the cassette for driving of the recording disc. The cassette and disc may be single or double sided, and includes access opening for a magnetic transducer to follow different circular tracks, or a helical track. The thin magnetic disc is provided with backing in the cassette to assure compliant interface of the transducer with the magnetic recording disc. The backing may be a backing sheet, discs of backing material, or felt surfaced shims adjacent the region of interface with the transducer. Passages are provided for air flow in response to rotation of the recording disc to provide a continuing smooth and minimum friction rotation of the disc within the cassette. The cassette is supported either on the base of the carriage or by a separately adjustable three point suspension system.
Inventors
- 👤 R Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:37
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/04; G11B17/041; G11B17/043; G11B17/0434; G11B17/021
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
244 words
A magnetic recording system including a deck and a magnetic disc recording cassette, comprising a base, a drive hub mounted in said base and means for rotating said drive hub, a magnetic transducer movably mounted in said base in spaced relation to said drive hub, means for moving said transducer to selected positions along a path toward and away from said drive hub, a thin flexible recording disc incapable of sustaining itself in a plane and having at least one magnetizable surface, a cassette surrounding said disc and having an elongated opening therein adjacent said magnetizable surface and aligned with the path of movement of said transducer providing access for said transducer to said surface, a driven hub attached to said disc and accessible to said drive hub adjacent the surface of said cassette, flexible backing disc means in contact with substantially the entire back surface of said flexible recording disc and attached to said driven hub for rotation with said hub and recording disc to provide additional support for said recording disc, said flexible backing disc means providing the sole additional support for said flexible recording disc when engaged with said transducer to provide a compliant backing for said flexible recording disc for compliant interfacing with said transducer, and support means on said base to locate said cassette in a predetermined position within said base to align said drive hub with said driven hub and to align said elongated opening with said transducer.
Claim 2
Dependent Claim
244 words
A magnetic recording system including a deck and a magnetic disc recording cassette, comprising a base, a drive hub mounted in said base and means for rotating said drive hub, a magnetic transducer movably mounted in said base in spaced relation to said drive hub, means for moving said transducer to selected positions along a path toward and away from said drive hub, a thin flexible recording disc incapable of sustaining itself in a plane and having at least one magnetizable surface, a cassette surrounding said disc and having an elongated opening therein adjacent said magnetizable surface and aligned with the path of movement of said transducer providing access for said transducer to said surface, a driven hub attached to said disc and accessible to said drive hub adjacent the surface of said cassette, flexible backing disc means in contact with substantially the entire back surface of said flexible recording disc and attached to said driven hub for rotation with said hub and recording disc to provide additional support for said recording disc, said flexible backing disc means providing the sole additional support for said flexible recording disc when engaged with said transducer to provide a compliant backing for said flexible recording disc for compliant interfacing with said transducer, and support means on said base to locate said cassette in a predetermined position within said base to align said drive hub with said driven hub and to align said elongated opening with said transducer.
Claim 3
Dependent Claim
42 words
A magnetic recording system as defined in claim 1, wherein said hubs have interengaging teeth forming a unidirectional rotary drive connection therebetween, and means holding said carriage in a playing position wherein said teeth on said hubs are brought into engaging position.
Claim 4
Dependent Claim
77 words
A magnetic recording system as defined in claim 1, wherein said means for moving said transducer includes a bracket extending parallel to a radius of said disc adjacent said elongated opening in said cassette, a lead screw mounted in said bracket also parallel to a radius of said disc, a supporting block carrying said transducer and movable along said bracket in response to rotation of said lead screw, and a motor connected to rotate said lead screw.
Claim 5
Dependent Claim
33 words
A system as defined in claim 3, wherein said motor is a stepping motor and controls therefor to step said motor causing said transducer to follow different circular paths on said recording disc.
Claim 6
Dependent Claim
35 words
A magnetic recording system as defined in claim 1 wherein the means to locate said cassette comprises a polygonal shaped carriage and said cassette has a corresponding polygonal shape to align it with said carriage.
Claim 7
Dependent Claim
28 words
A magnetic recording system as defined in claim 5, including a retaining mechanism on said carriage operative to position said cassette within said carriage in the playing position.
Claim 8
Dependent Claim
37 words
A magnetic recording system as defined in claim 6, including means for releasing said retaining mechanism, and ejector means operable upon release of said retaining mechanism to move said cassette at least partially out of said carriage.
Claim 9
Dependent Claim
169 words
A magnetic recording system including a deck and a magnetic disc recording cassette, comprising a base, a drive hub mounted in said base and means for rotating said drive hub, a magnetic transducer movably mounted in said base in spaced relation to said drive hub, means for moving said transducer to selected positions along a path toward and away from said drive hub, a thin flexible recording disc incapable of sustaining itself in a plane and having at least one magnetizable surface, a driven hub attached to said disc, flexible backing disc means contacting substantially the Entire back surface of said flexible recording disc and attached to said driven hub for rotation with said hub and recording disc to provide additional support for said recording disc and to provide a compliant backing for said flexible recording disc for compliant interfacing with said transducer, and support means on said base to locate said discs in a predetermined position within said base to align said drive hub with said driven hub.
Claim 10
Dependent Claim
169 words
A magnetic recording system including a deck and a magnetic disc recording cassette, comprising a base, a drive hub mounted in said base and means for rotating said drive hub, a magnetic transducer movably mounted in said base in spaced relation to said drive hub, means for moving said transducer to selected positions along a path toward and away from said drive hub, a thin flexible recording disc incapable of sustaining itself in a plane and having at least one magnetizable surface, a driven hub attached to said disc, flexible backing disc means contacting substantially the Entire back surface of said flexible recording disc and attached to said driven hub for rotation with said hub and recording disc to provide additional support for said recording disc and to provide a compliant backing for said flexible recording disc for compliant interfacing with said transducer, and support means on said base to locate said discs in a predetermined position within said base to align said drive hub with said driven hub.
Claim 11
Dependent Claim
46 words
The system of claim 8 further comprising stationary flexible backing sheet means secured opposite the back surface of said flexible backing disc means to provide a compliant backing for said flexible recording disc and backing disc means during rotation thereof and interfacing of said transducer therewith.
Claim 12
Dependent Claim
29 words
The apparatus of claim 8 wherein said flexible backing disc means includes a backing disc of thin cloth-like material contacting substantially the entire back surface of said recording disc.
Claim 13
Dependent Claim
32 words
The system of claim 10 wherein said flexible backing disc means includes a further backing disc of flexible plastic material contacting substantially the entire back surface of said disc of cloth-like material.
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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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |