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公开(公告)号：DE69127063T2
公开(公告)日：1998-02-12
申请号：DE69127063
申请日：1991-12-04
Applicant: IBM
Inventor： DENISON EDWARD VIRGIL , KAHWATY VINCENT NOEL , STERN GUSTAVE CHRISTIAN , STEVIN GERALD , ZAMMIT ROBERT PAUL
Abstract: In a magnetic recording system tape is transported bi-directionally across the interleaved head. The interleaved head includes two modules, each module having a plurality of alternate read and write transducer gaps spaced apart along a single gap line transverse to the movement of the magnetic tape. The two modules are placed together so that the write gaps of one module are aligned with the read gaps of the other module. Each module is formed on a nickel-zinc ferrite substrate by deposition of magneto-resistive material to form read transducer elements 69 and deposition of conductor material to form read conductors 74, 76 and 78 and write coils 80. A nickel zinc ferrite closure piece is secured to the substrate to complete the module. In order to provide leveling across the write and read transducers of the module, write back gap islands 90, 92 are provided in the back gap regions 68 of the write coils made of the same material with the same thickness as the magneto resistive element and the conductors interconnecting the magneto resistive element to the read/write network of the tape drive.
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公开(公告)号：DE2741544A1
公开(公告)日：1978-03-23
申请号：DE2741544
申请日：1977-09-15
Applicant: IBM
IPC: G01R33/387 , G01R33/383 , H01F7/20
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公开(公告)号：DE69127063D1
公开(公告)日：1997-09-04
申请号：DE69127063
申请日：1991-12-04
Applicant: IBM
Inventor： DENISON EDWARD VIRGIL , KAHWATY VINCENT NOEL , STERN GUSTAVE CHRISTIAN , STEVIN GERALD , ZAMMIT ROBERT PAUL
Abstract: In a magnetic recording system tape is transported bi-directionally across the interleaved head. The interleaved head includes two modules, each module having a plurality of alternate read and write transducer gaps spaced apart along a single gap line transverse to the movement of the magnetic tape. The two modules are placed together so that the write gaps of one module are aligned with the read gaps of the other module. Each module is formed on a nickel-zinc ferrite substrate by deposition of magneto-resistive material to form read transducer elements 69 and deposition of conductor material to form read conductors 74, 76 and 78 and write coils 80. A nickel zinc ferrite closure piece is secured to the substrate to complete the module. In order to provide leveling across the write and read transducers of the module, write back gap islands 90, 92 are provided in the back gap regions 68 of the write coils made of the same material with the same thickness as the magneto resistive element and the conductors interconnecting the magneto resistive element to the read/write network of the tape drive.
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公开(公告)号：DE69213558D1
公开(公告)日：1996-10-17
申请号：DE69213558
申请日：1992-04-30
Applicant: IBM
Inventor： ABOAF JOSEPH ADAM , DENISON EDWARD BIRGIL , KAHWATY VINCENT NOEL , STEVING GERALD
Abstract: An interleaved bi-directional magnetic tape head for contact recording has a stripe poletip 30 in the form of a thin film of a soft magnetic material deposited onto a magnetic ferrite substrate 22. A second thin film polepiece 40 is deposited over a gap region 26. A closure block 24 of a non-magnetic ceramic encloses the layers together with leveling insulation layers 32, 34 and deposited activating conductor turns 36. The stripe poletip extends for a distance just short of the first conductor turn and provides a balancing of the saturation moment of the pole pieces and provides for better recording capability, especially when operating in a trailing magnetic ferrite mode.
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公开(公告)号：CA2064641C
公开(公告)日：1998-09-22
申请号：CA2064641
申请日：1992-04-01
Applicant: IBM
Inventor： ABOAF JOSEPH ADAM , DENISON EDWARD VIRGIL , KAHWATY VINCENT NOEL , STEVING GERALD
Abstract: An interleaved bi-directional magnetic tape head for contact recording can have a poletip enhanced by providing a thin film of a soft magnetic material deposited onto a magnetic ferrite substrate. The second pole piece is a thin film of the soft magnetic material. A closure block of a non-magnetic ceramic encloses the layers together with leveling insulation layers and a deposited activating conductor turns. The stripe poletip deposited onto the magnetic ferrite extends for a distance just short of the first conductor turn and provides a balancing of the saturation moment of the pole pieces and provides for better recording capability, especially when operating in a trailing magnetic ferrite mode.
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Patent Agency Ranking
公开(公告)号：CA2054579C
公开(公告)日：1995-09-26
申请号：CA2054579
申请日：1991-10-31
Applicant: IBM
Inventor： DENISON EDWARD VIRGIL , KAHWATY VINCENT NOEL , STERN GUSTAVE CHRISTIAN , STEVING GERALD , ZAMMIT ROBERT PAUL
Abstract: An interleaved head is disclosed for reading and writing data transitions onto a magnetic tape. A magnetic recording system is disclosed for the bi-directional transportation of the tape media across the interleaved head. A controller controls the tape drive in a reel-to-reel format to accomplish the bi-directional motion of the tape media. The interleaved head includes two modules with each module having a plurality of alternating read and write transducers alternately spaced apart along a single line placed transverse to the movement of the magnetic tape. The two modules are placed together such that the write gaps of one module are aligned with the read gaps of the other module. Each read module includes the magneto-resistive element. Each write transducer includes a thin film conductor driving a nickel zinc ferrite substrate as one pole piece and a nickel zinc closure piece as the second pole piece. In order to provide leveling across the write transducers of the module, write back gap islands are provided in the back gap regions of the write transducer made of the same material with the same thickness as the magneto resistive element and the conductors interconnecting the magneto resistive element to the read/write network of the tape drive.
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公开(公告)号：DE69012479T2
公开(公告)日：1995-03-30
申请号：DE69012479
申请日：1990-05-21
Applicant: IBM
Inventor： ABOAF JOSEPH ADAM , KAHWATY VINCENT NOEL , NIX JAMES LAMAR , SHELLEDY FRANK BOYD
Abstract: A soft film biased magnetoresistive sensor (10) is fabricated to have reduced Barkhausen noise. The magnetic ratio of the film layers (14 and 18) is controlled to be in the range of 1.7 to 1.95 and the optimum bias point is controlled to be in the range of 35 and 41 degrees.
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公开(公告)号：DE69616645T2
公开(公告)日：2002-08-01
申请号：DE69616645
申请日：1996-04-22
Applicant: IBM
Inventor： ABOAF JOSEPH ADAM , DENISON EDWARD VIRGIL , FRIEDMAN JULES DAVID , KAHWATY VINCENT NOEL , KLUGE II
Abstract: A head (10) is provided for reading and writing to tape media (48) along a tape head face. The tape head comprises a plurality of modules, each module comprising a read element (54) and a write element (52) spaced apart and terminating at the tape head face and formed over a substrate (12). The read element comprises a soft film bias layer (24) and a hard film bias layer (25) butted against the SFB layer. The write element comprises two pole tips (14,16) spaced apart by a gap (22). The tape head further includes a plurality of activating conducting coil turns (20) operatively associated with the write element and covered by a cross-linked photoresist and positioned between the gap and one of the pole tips and set back from the tape head face. The tape head has at least one of the following elements: (a) a wear shield (34) between the read element and the write element for limiting wear of the gap between the two pole tips, the wear shield being grounded for decoupling read and write functions of the tape head, for allowing same module read/servo/write functions simultaneously, and for grounding static charge from the tape media; (b) a layer of electrically conductive and corrosion-resistant material (62), such as rhodium, under the hard film bias layer to reduce its resistance; and (c) a non-activating dummy coil turn (120,220) closer to the pole tips than the activating coil turns for defining a forward termination of the cross-linked photoresist (38a) between the activating coil turns and the tape head face to thereby provide improved ease of processability.
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公开(公告)号：HK210996A
公开(公告)日：1996-12-06
申请号：HK210996
申请日：1996-11-28
Applicant: IBM
Inventor： ABOAF JOSEPH ADAM , DENISON EDWARD BIRGIL , KAHWATY VINCENT NOEL , STEVING GERALD
Abstract: An interleaved bi-directional magnetic tape head for contact recording has a stripe poletip 30 in the form of a thin film of a soft magnetic material deposited onto a magnetic ferrite substrate 22. A second thin film polepiece 40 is deposited over a gap region 26. A closure block 24 of a non-magnetic ceramic encloses the layers together with leveling insulation layers 32, 34 and deposited activating conductor turns 36. The stripe poletip extends for a distance just short of the first conductor turn and provides a balancing of the saturation moment of the pole pieces and provides for better recording capability, especially when operating in a trailing magnetic ferrite mode.
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公开(公告)号：DE2801031A1
公开(公告)日：1978-08-17
申请号：DE2801031
申请日：1978-01-11
Applicant: IBM
Inventor： HOFER DONALD CLIFFORD , KAHWATY VINCENT NOEL , VALENTINO CARL ROBERT
IPC: G05F7/00 , G01R33/389 , G01R33/46 , G01N27/78
Abstract: An NMR (nuclear magnetic resonance) spectrometer has a permanent magnet provided with a field coil. A lock system cyclically pulses a deuterium lock sample to produce a FID (free induction decay) signal that is analyzed by measuring the time interval during which the FID signal crosses the zero axis a predetermined number of times. The measured interval is compared to a predetermined interval or set point, and the current through the field coil is adjusted in the direction tending to correct the field strength so as to maintain the measured interval equal to the preset interval. Such measurement, comparison and adjustment are done several times each second. When the sample is removed, the lock system retains the last field setting achieved with the sample.
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