US4303956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Load-sharing type magnetic head
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1979-09-20
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Granted: 1981-12-01
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Expires: 1999-09-20
Abstract
Abstract Disclosed herein is a load-sharing type magnetic head, comprising a plurality of mutually independent arrayed magnetic head cores and a plurality of drive lines formed of coils each wound successively on the magnetic head cores in such a manner that the sequence of winding directions of the plurality of coils on each magnetic head core is different from that on all other magnetic head cores in the whole system, whereby the sum of the magnetomotive forces produced by the plurality of coils in the magnetic head cores is amply increased in the selected head core and amply decreased in the remaining cores by properly controlling the direction and/or magnitude of the electric current passed through the drive lines.
Inventors
- 👤 Akio Kobubu
- 👤 Toshio Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:35
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/17; G11B15/00; G11B15/02; G11B15/12; G11B20/00; G11B20/10; G11B5/29; G11B5/48; G11B5/49; G11B5/4969
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
123 words
A load-sharing type magnetic head, comprising: a plurality of mutually independent head cores; and a plurality of serial drive lines each wound successively on the respective head cores to form coils on each head core, with the sequence of said coils on each head core differing in winding direction from that on any other head core in the whole system, whereby electric currents each having a polarity so determined that said coils on one selected head core produce magnetic fluxes in the same direction are respectively supplied to all of said coils thereby causing one selected head core to be excited to an amply large extent to consequently permit signals to be recorded in a selected one of tracks on a recording medium.
Claim 2
Dependent Claim
123 words
A load-sharing type magnetic head, comprising: a plurality of mutually independent head cores; and a plurality of serial drive lines each wound successively on the respective head cores to form coils on each head core, with the sequence of said coils on each head core differing in winding direction from that on any other head core in the whole system, whereby electric currents each having a polarity so determined that said coils on one selected head core produce magnetic fluxes in the same direction are respectively supplied to all of said coils thereby causing one selected head core to be excited to an amply large extent to consequently permit signals to be recorded in a selected one of tracks on a recording medium.
Claim 3
Dependent Claim
79 words
The load-sharing type magnetic head according to claim 1, wherein one selected head core is excited to an amply large extent and the remaining head cores are excited to an amply small extent by controlling the absolute values of electric current flowing to the drive lines and thereby compensating the differences of flux transfer efficiency which are dependent upon the distances from the plurality of coils wound on the head cores to the pole-tip of the respective head cores.
Claim 4
Dependent Claim
54 words
The load-sharing type magnetic head according to claim 1, wherein the number of drive lines is decreased in comparison with the number of head cores except that the ratio of the largest magnetic flux generated in any of the non-selected head cores to the magnetic flux generated in the selected head core is 0.
Claim 5
Dependent Claim
158 words
A load-sharing type magnetic head, comprising: a plurality of mutually independent head cores; and a plurality of serial drive lines each wound successively on the respective head cores to form coils on each head core, with the sequence of said coils on each head core differing in winding direction from that on any other head core in the whole system, whereby magnetic signals from the recording medium are delivered to a plurality of head cores in order to generate a magnetomotive force in the coils wound on the head cores in such a manner as to cause the plurality of drive lines to issue potential signals in order to read out the magnetic signals from the recording medium in conformity with a pattern of the potential differences from the drive lines whereby each of said magnetic signals from said recording medium produces a corresponding potential signal differing from every other magnetic signal read out from said recording medium.
Claim 6
Dependent Claim
158 words
A load-sharing type magnetic head, comprising: a plurality of mutually independent head cores; and a plurality of serial drive lines each wound successively on the respective head cores to form coils on each head core, with the sequence of said coils on each head core differing in winding direction from that on any other head core in the whole system, whereby magnetic signals from the recording medium are delivered to a plurality of head cores in order to generate a magnetomotive force in the coils wound on the head cores in such a manner as to cause the plurality of drive lines to issue potential signals in order to read out the magnetic signals from the recording medium in conformity with a pattern of the potential differences from the drive lines whereby each of said magnetic signals from said recording medium produces a corresponding potential signal differing from every other magnetic signal read out from said recording medium.
Claim 7
Dependent Claim
44 words
The load-sharing type magnetic head according to claim 4, wherein the plurality of drive lines are adapted to issue potential signals capable of reading the digital data from the recording medium by subjecting said digital data to processing for level comparison and code conversion.
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) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |