US3573390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic transducing system
Assignee: International Business Machines Corp
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Filing: 1969-01-15
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Granted: 1971-04-06
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Expires: 1989-01-15
Abstract
Abstract A system for using a first magnetic head that develops flux lines transverse to the direction of a magnetic track for transposing a high density recording on the track by magnetic transfer to another tape which is arranged in a loop configuration. A second head with a relatively short magnetic gap is then utilized to read out this high density recording of the single track on the second tape. Thus, the head requirement for read out of the narrow track high density recording is essentially divided into two heads rather than being dependent upon a singular head having a single gap that is both short and narrow.
Inventors
- 👤 William T Frost
- 👤 Armand P Neukermans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/86; G11B5/865
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
151 words
A system for reproducing from a first magnetic record a narrow high density magnetic first track, having length and width directions, said system comprising: magnetic transfer means positioned at a transfer station for transposing said first track to a second magnetic record; said magnetic transfer means including a bias head having a magnetic gap which effects flux lines transverse to the length of said first track and grouped along a portion of the length of said track, to produce a bias field for duplicating said narrow first track as a second track on said second record; transducer means for reproducing said second track; and said transducer means comprising a magnetic head having a relatively short gap and being disposed in magnetically coupled relationship with said second track, thereby to reproduce said narrow high density magnetic track by means of both a magnetic transfer bias head and a high density reproducing head.
Claim 2
Independent Claim
151 words
A system for reproducing from a first magnetic record a narrow high density magnetic first track, having length and width directions, said system comprising: magnetic transfer means positioned at a transfer station for transposing said first track to a second magnetic record; said magnetic transfer means including a bias head having a magnetic gap which effects flux lines transverse to the length of said first track and grouped along a portion of the length of said track, to produce a bias field for duplicating said narrow first track as a second track on said second record; transducer means for reproducing said second track; and said transducer means comprising a magnetic head having a relatively short gap and being disposed in magnetically coupled relationship with said second track, thereby to reproduce said narrow high density magnetic track by means of both a magnetic transfer bias head and a high density reproducing head.
Claim 3
Dependent Claim
29 words
A system as set forth in claim 1 wherein the length of said magnetic gap of said bias head is approximately equal to the width of said first track.
Claim 4
Dependent Claim
14 words
A system as set forth in claim 2 wherein said second track is endless.
Claim 5
Dependent Claim
28 words
A system as set forth in claim 3 wherein said first and said second magnetic records are magnetic tapes and said second record is an endless tape loop.
Claim 6
Dependent Claim
29 words
A system as set forth in claim 4 including a means for erasing said second track after said second track is reproduced by said short gap magnetic reproducing head.
Claim 7
Independent Claim
191 words
A system for reproducing from a first magnetic tape a narrow high density magnetic first track having length and width directions, said system comprising: a second magnetic tape; magnetic transfer means positioned at a transfer station and including means for applying pressure to said first and said second magnetic tapes at said transfer station so that juxtaposed magnetic surfaces of said tapes are in intimate contact; means for applying a bias field to the juxtaposed surfaces of said tapes at said transfer station to transfer and duplicate said narrow track as a second track on said second magnetic tape; said biasing means including a first magnetic head having a magnetic gap for producing a bias field with flux lines disposed in transverse relationship to the length of said first track and grouped along a portion of the length of said first track; first and second drive means for driving said first and second magnetic tapes respectively through said transfer station; transducer means downstream from said transfer station for reproducing said second track from said second tape; and said transducer means comprising a second magnetic head magnetically coupled with said second track.
Claim 8
Independent Claim
191 words
A system for reproducing from a first magnetic tape a narrow high density magnetic first track having length and width directions, said system comprising: a second magnetic tape; magnetic transfer means positioned at a transfer station and including means for applying pressure to said first and said second magnetic tapes at said transfer station so that juxtaposed magnetic surfaces of said tapes are in intimate contact; means for applying a bias field to the juxtaposed surfaces of said tapes at said transfer station to transfer and duplicate said narrow track as a second track on said second magnetic tape; said biasing means including a first magnetic head having a magnetic gap for producing a bias field with flux lines disposed in transverse relationship to the length of said first track and grouped along a portion of the length of said first track; first and second drive means for driving said first and second magnetic tapes respectively through said transfer station; transducer means downstream from said transfer station for reproducing said second track from said second tape; and said transducer means comprising a second magnetic head magnetically coupled with said second track.
Claim 9
Dependent Claim
40 words
A system as set forth in claim 6 including erase means downstream from said magnetic head for erasing said second track after said narrow high density track has been reproduced from said second magnetic tape by said second magnetic head.
Claim 10
Dependent Claim
18 words
A system as set forth in claim 6 wherein said secoNd magnetic tape is an endless type loop.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |