US20040021982A1 - Magnetic recording head, magnetic reproducing head, magnetic head, tape drive and disk drive - Google Patents
Magnetic recording head, magnetic reproducing head, magnetic head, tape drive and disk drive Download PDFInfo
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- US20040021982A1 US20040021982A1 US10/431,834 US43183403A US2004021982A1 US 20040021982 A1 US20040021982 A1 US 20040021982A1 US 43183403 A US43183403 A US 43183403A US 2004021982 A1 US2004021982 A1 US 2004021982A1
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- recording head
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
- G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
- G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
- G11B5/3945—Heads comprising more than one sensitive element
- G11B5/3948—Heads comprising more than one sensitive element the sensitive elements being active read-out elements
- G11B5/3951—Heads comprising more than one sensitive element the sensitive elements being active read-out elements the active elements being arranged on several parallel planes
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3103—Structure or manufacture of integrated heads or heads mechanically assembled and electrically connected to a support or housing
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
- G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
- G11B5/53—Disposition or mounting of heads on rotating support
- G11B5/531—Disposition of more than one recording or reproducing head on support rotating cyclically around an axis
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
- G11B5/53—Disposition or mounting of heads on rotating support
- G11B5/531—Disposition of more than one recording or reproducing head on support rotating cyclically around an axis
- G11B5/534—Disposition of more than one recording or reproducing head on support rotating cyclically around an axis inclined relative to the direction of movement of the tape, e.g. for helicoidal scanning
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/10—Structure or manufacture of housings or shields for heads
- G11B5/11—Shielding of head against electric or magnetic fields
- G11B5/115—Shielding devices arranged between heads or windings
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/29—Structure or manufacture of unitary devices formed of plural heads for more than one track
- G11B5/295—Manufacture
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3109—Details
- G11B5/3116—Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3163—Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
- G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
- G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
- G11B5/3912—Arrangements in which the active read-out elements are transducing in association with active magnetic shields, e.g. magnetically coupled shields
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
- G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
- G11B5/3967—Composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/488—Disposition of heads
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/488—Disposition of heads
- G11B5/4886—Disposition of heads relative to rotating disc
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/488—Disposition of heads
- G11B5/4893—Disposition of heads relative to moving tape
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/49—Fixed mounting or arrangements, e.g. one head per track
- G11B5/4969—Details for track selection or addressing
- G11B5/4976—Disposition of heads, e.g. matrix arrangement
Definitions
- the present invention relates to a magnetic recording head, a magnetic reproducing head, a magnetic head, a tape drive and a disk drive using a similar, and in particular, relates to a technology for facilitating arrangement of a plurality of magnetic heads (including both magnetic recording heads and magnetic reproducing heads) (hereinafter referred to as multiplicity of magnetic heads) in order to achieve higher recording density.
- width reduction a recording track width thereof
- multi-channeling in order to realize a large capacity storage and a high density in magnetic recording and reproducing of information, provision of a multiplicity of channels is desired (hereinafter referred to as a “multi-channeling”), and hence a multi-channeled magnetic head is on demand.
- a head that is formed by laminating a plurality of magnetic recording head elements or magnetic reproducing head elements on one common substrate via a magnetic shielding layer, an insulating layer and the like has been proposed by the present applicant of the present invention.
- a magnetic head disclosed in the JP-A Laid-Open No. 2001-6750 is directed to a magnetic recording head, and a magnetic head disclosed in the JP-A Laid-Open No. 2000-348377 is directed to a magnetic reproducing head.
- Both of those magnetic heads mentioned above are formed by laminating a plurality of magnetic recording head layers or magnetic reproducing head layers, each layer including a single magnetic head element, on a substrate made of a non-magnetic substance, and displacing all magnetic head elements from each other in an orthogonal direction relative to a direction of lamination thereof (herein after referred to as a “head width direction”).
- each magnetic head element is placed in proximity or overlapped in the direction of the head width thereby enabling to respond to narrower recording track.
- the number of channels required for a magnetic recording medium nowadays is not limited to 2 channels or 4 channels, but several tens of channels, for example, 40 channels or more are demanded. This is because that in the field of information recording, a further speedup in recording speed and/or reproducing speed is desired, thereby necessitating a provision of a greater multiplicity of channels for recording and reproducing information to and from a recording medium.
- magnetic head layers each having a magnetic head element must be laminated as many as 40 layers.
- an alignment error between two magnetic head elements adjacent in the direction of lamination is considered to be approximately 0.05 ⁇ m.
- the present invention has been contemplated in view of the above-mentioned problems associated with the conventional technology, and to achieve a further improvement in the recording and reproducing density by an increased multi-channeling of the magnetic head elements.
- a magnetic recording head includes a plurality of magnetic recording head layers laminated on a substrate made of a non-magnetic material, each of the plurality of magnetic recording head layers including magnetic recording head elements fabricated by a thin film process and interposed between two insulating layers, and all of the magnetic recording head elements being displaced from each other in a head width direction constituting an orthogonal direction relative to a direction of lamination, the plurality of magnetic recording head layers comprising a plurality of magnetic recording head elements formed at a predetermined pitch.
- a tape drive having a magnetic recording head for recording a signal on a recording medium in tape form and a tape running means for running the recording medium in tape form along a predetermined run path;
- the magnetic recording head includes a plurality of magnetic recording head layers laminated on a substrate made of a non-magnetic material, each of the plurality of magnetic recording head layers including magnetic recording head elements interposed between two insulating layers, all of the magnetic recording head elements formed therein being displaced from each other in a head width direction constituting an orthogonal direction relative to a direction of lamination thereof; and said plurality of magnetic recording head layers includes a plurality of magnetic recording head elements formed at a predetermined pitch.
- each magnetic recording head element As a result, according to the preferred embodiments of the present invention, as the plurality of magnetic recording head elements are formed at a predetermined pitch in each magnetic recording head layer, a width of each magnetic recording head element can be reduced and an alignment error between each recording head elements can be minimized, thereby enabling recording further narrower recording tracks with higher density, hence permitting realizing a multi-channeling capability for the magnetic recording head.
- a magnetic reproducing head device including a plurality of magnetic reproducing head layers laminated on a substrate made of a non-magnetic material, each of the plurality of the magnetic reproducing head layers including magnetic reproducing head elements fabricated by a thin film process and interposed between two magnetic shielding layers, and all of the magnetic reproducing head elements being displaced from each other in a head width direction constituting an orthogonal direction relative to a direction of lamination; the plurality of magnetic reproducing head layers including a plurality of magnetic reproducing head elements formed at a predetermined pitch.
- a tape drive apparatus having a magnetic reproducing head for reproducing a signal from a recording medium in tape form and a tape running means for running the recording medium in tape form along a predetermined transport path;
- the magnetic reproducing head includes a plurality of magnetic reproducing head layers laminated on a substrate made of a non-magnetic material, each of the plurality of magnetic reproducing head layers having magnetic reproducing head elements fabricated by a thin film process and interposed between two magnetic shielding layers, and all of the magnetic reproducing head elements formed therein being displaced from each other in a head width direction constituting an orthogonal direction relative to the direction of lamination thereof, and the magnetic reproducing head layers include a plurality of magnetic reproducing head elements formed at a predetermined pitch.
- each magnetic reproducing head element is formed at a predetermined pitch by the thin film process in each magnetic reproducing head layer, a width of each magnetic reproducing head element can be reduced, and an alignment error between each magnetic reproducing head element can be minimized, thereby enabling to reproduce information from further narrower recording tracks with higher density.
- any two magnetic reproducing head elements adjacent in the direction of lamination via a magnetic shielding layer share a common magnetic shielding layer existing therebetween, thereby capable of omitting one step of the lamination processes hence achieving a cost reduction.
- a magnetic reproducing head in which two magnetic reproducing head elements adjacent in the direction of lamination via magnetic shielding layers, further has an insulting layer interposed between two magnetic shielding layers existing between the two magnetic reproducing head elements, thereby enabling to eliminate a crosstalk therebetween, thus permitting achieving higher density.
- a magnetic head includes a plurality of magnetic reproducing head layers each having magnetic reproducing head elements fabricated by a thin film process and interposed between two magnetic shielding layers and a plurality of magnetic recording head layers each having magnetic recording head elements fabricated by a thin film process and interposed between two insulating films, laminated on a substrate made of a non-magnetic material, and all of the magnetic reproducing head elements being displaced from each other in a head width direction constituting an orthogonal direction relative to a direction of lamination thereof;
- the magnetic reproducing head layers comprise a plurality of magnetic reproducing head elements formed at a predetermined pitch;
- the magnetic recording head layers has a plurality of magnetic recording head elements formed at a same pitch as the plurality of magnetic reproducing head elements; and each magnetic reproducing head element and each magnetic recording head element are formed approximately at a similar position in the head width direction, forming a pair.
- a tape drive is provided with a magnetic head for recording and reproducing a signal to and from a recording medium in tape form, and a tape running means for running the recording medium in tape form along a predetermined running path;
- the magnetic head includes a plurality of magnetic reproducing head layers each having magnetic reproducing head elements fabricated by a thin film process and interposed between two magnetic shielding layers, and a plurality of magnetic recording head layers each having magnetic recording head elements fabricated by a thin film process and interposed between two insulating layers, laminated on a substrate made of a non-magnetic material, all of the magnetic reproducing head elements therein being displaced from each other in a head width direction constituting an orthogonal direction relative to the direction of lamination, and all of the magnetic recording head elements therein being displaced from each other in the head width direction; each magnetic reproducing head layer includes a plurality of magnetic reproducing head elements formed at a predetermined pitch; each magnetic recording head layer includes a plurality of magnetic
- a disk drive is provided with a magnetic head for recording and reproducing a signal to and from a disk-shaped recording medium, and a drive mechanism for rotating the disk-shaped recording medium;
- the magnetic head includes: a plurality of magnetic reproducing head layers each including magnetic reproducing head elements fabricated by a thin film process and interposed between two magnetic shielding layers; and a plurality of magnetic recording head layers each including magnetic recording head elements fabricated by a thin film process and interposed between two insulating layers, both being laminated on a substrate made of a non-magnetic material, all of the magnetic reproducing head elements formed therein being displaced from each other in a head width direction constituting an orthogonal direction relative to a direction of lamination, and all of the magnetic recording head elements formed therein being displaced from each other in the head width direction; each magnetic reproducing head layer includes a plurality of magnetic reproducing head elements formed at a predetermined pitch; each magnetic recording head layer includes a plurality of magnetic recording head elements formed at a predetermined pitch;
- each magnetic head layer there are provided a plurality of magnetic reproducing head elements or a plurality of magnetic recording head elements formed at a predetermined pitch respectively, thereby the magnetic head having a number of the magnetic reproducing heads and the magnetic recording heads corresponding to an integer multiple of the number of laminations (two or more) in order to reproduce and record information to and from recording tracks.
- respective magnetic head layers there is provided a plurality of magnetic reproducing head elements and a plurality, of magnetic recording head elements, formed at a predetermined pitch, a width of each magnetic recording head element and each magnetic reproducing head element can be reduced, and alignment errors between respective magnetic recording head elements or respective magnetic reproducing head elements can be minimized, thereby enabling to record and reproduce information to and from narrower and higher density recording tracks, thereby providing a magnetic recording and reproducing head capable of coping with a trend towards an ever increasing multi-channeling.
- magnetic reproducing head layers and magnetic recording head layers are alternately laminated to provide a pair of a magnetic reproducing head element and a magnetic recording head element adjacent in the direction of lamination via a magnetic shielding layer and an insulating layer, and the pair of the magnetic recording head elements and the magnetic reproducing head elements residing in a magnetic recording head layer and in a magnetic reproducing head layer respectively adjacent to each other in the direction of lamination, both of the pair can be formed in proximity to each other, thereby enabling to minimize an alignment error in the head width direction between each magnetic recording head element and each reproducing head element of the pair.
- a manufacturing process thereof is substantially simplified.
- FIG. 1 is a schematic plan view depicting a conventional a tape drive apparatus
- FIG. 2 shows, together with FIGS. 3 to 5 , a first exemplary preferred embodiment of the present invention, and in particular, it depicts a relationship between a magnetic recording head and recording tracks;
- FIG. 3 is a schematic perspective view of a cut-out portion of the magnetic recording head
- FIG. 4 is a schematic plan view of a rotary drum
- FIG. 5 is a schematic diagram indicating a positional relationship between recording tracks and the magnetic recording head
- FIG. 6 shows, together with FIG. 7, a second exemplary preferred embodiment of the present invention, and in particular, it shows a schematic diagram indicating each positional relationship at a first revolution, a second revolution and a third revolution of the magnetic recording head;
- FIG. 7 is a schematic diagram indicating each positional relationship between the magnetic recording head and recording tracks at respective rounds;
- FIG. 8 shows, together with FIGS. 9 and 10, a third exemplary preferred embodiment of the present invention, and in particular, it shows a relationship between a magnetic reproducing head and recording tracks;
- FIG. 9 is a schematic plan view of a rotary drum
- FIG. 10 is a schematic diagram indicating a positional relationship between recording tracks and the magnetic reproducing head
- FIG. 11 shows a modified version of the magnetic reproducing head according to the third embodiment of the present invention, and in particular, it shows a positional relationship between its magnetic reproducing head and recording tracks;
- FIG. 12 shows, together with FIG. 13, a fourth embodiment of the present invention, and in particular, it depicts each positional relationship at a first, a second and a third revolutions of the magnetic reproducing head;
- FIG. 13 is a schematic diagram indicating a positional relationship between the magnetic recording head and the recording tracks at each revolution;
- FIG. 14 shows a fifth embodiment of the present invention, and in particular, it shows a diagram indicating a relationship between its magnetic head and recording tracks;
- FIG. 15 shows a sixth embodiment of the present invention, and in particular, it shows a diagram indicating a relationship between its magnetic head and recording tracks;
- FIG. 16 is a schematic plan view of a disk drive.
- a tape drive 1 is provided with: a rotary drum unit 2 ; guide pins 5 , 5 , . . . which form a predetermined tape path for a tape-form recording medium 4 by pulling it out from a tape cassette 3 and winding around the rotary drum unit 2 ; reel tables 7 , 7 for supporting reels 6 , 6 of the tape cassette 3 ; a capstan axis 9 for running the tape-form recording medium 4 in collaboration with a pinch roller 8 , and so on, as shown in FIG. 1.
- the rotary drum unit 2 is mounted with its axial center slightly slanting relative to the plane of a chassis 10 , and when a tape cassette 3 is loaded, its tape-form recording medium 4 is pulled out toward the rotary drum unit 2 by the guide pins 5 , 5 , . . . to be wound around the rotary drum 2 , and at a similar time, the tape-form recording medium 4 is gripped between the pinch roller 8 and the capstan axis 9 thereby forming a tape run path, as shown in FIG. 1.
- FIG. 1 schematically illustrates a state in which the tape cassette 3 is loaded in the tape drive apparatus 1 and the tape path is formed.
- the tape-form recording medium 4 is caused to run along the tape run path at a constant speed.
- the above-mentioned parts such as “guide pins 5 , pinch roller 8 , capstan axis 9 ′ correspond to a tape running means for running a recording medium in tape form along a predetermined running path” as will be described later.
- the rotary drum unit 2 described above is provided with a stationary axis 11 mounted on the chassis 10 , a rotary drum 12 rotatably supported by the stationary axis 11 via a bearing (not shown), and a stationary drum 13 disposed under the rotary drum 12 and fixed to the chassis 10 , the stationary drum 13 and the rotary drum 12 being mounted opposing to each other and having a predetermined clearance there between; a notch (not shown) is formed in a bottom edge portion in a perimeter of the rotary drum 12 , and in the notch there are disposed a magnetic recording head 20 , a magnetic reproducing head 40 or a magnetic head 60 , described later.
- FIG. 2 to FIG. 5 show a first exemplary preferred embodiment of the present invention, in which a magnetic recording head 20 having eight pieces of magnetic recording head elements is mounted on its rotary drum 2 .
- FIG. 2 which is a schematic diagram of an enlarged portion of the magnetic recording head 20 , shows a frontal view as seen from a side thereof in contact with the tape-form recording medium 4 .
- the magnetic recording head 20 is formed by sequentially laminating four layers of magnetic recording head layers 21 , 21 , . . . on a bottom non-magnetic substrate 22 , and an upper non-magnetic substrate 23 on the uppermost magnetic recording head layer 21 .
- Each magnetic recording head layer 21 has two insulating layers 24 , 24 and a magnetic film layer 25 interposed between these insulating layers 24 , 24 , wherein a bottom magnetic pole 26 is formed on the magnetic film layer 25 partially protruding in an upper direction as viewed from the front side, and an upper magnetic pole 27 formed over the bottom magnetic pole 26 spaced apart therefrom with a predetermined distance (hereinafter referred to as gap) G, which in combination form a magnetic recording head element 28 as shown in FIG. 2.
- the magnetic recording head element 28 is formed by winding a coil 30 around a core 29 formed in a U-shape as viewed from a lateral direction, wherein the upper and bottom end portions of the core 29 correspond to the upper pole piece 27 and the bottom pole piece 26 , as illustrated in FIG. 3.
- the bottom and the upper non-magnetic substrates 22 and 23 are made of AlTiC, for example.
- the insulating layers 24 , 24 , . . . are made of, for example, Al 2 O 3 .
- the magnetic thin film layer 25 is preferably made of a ferromagnetic material such as, for example, Ni—Fe (Permalloy), Si—Al—Fe (Sendust), amorphous iron core material (highly magnetically permeable thin film) and the like.
- the magnetic recording head 20 thus assembled according to the first embodiment of the present invention has eight pieces of the magnetic recording head elements 28 , 28 , . . . , 28 in total, as illustrated in FIG. 2.
- any two magnetic recording head elements 28 , 28 adjacent in the direction of lamination via an insulating layer 24 are made share one common layer of insulating layer 24 .
- the magnetic recording head 20 is composed by alternately laminating five layers of insulating layers 24 , 24 , . . . , 24 and four layers of magnetic film layers 25 , 25 , . . . , 25 between the bottom non-magnetic substrate 22 and the upper non-magnetic substrate 23 , more specifically such as “the bottom nonmagnetic substrate 22 -insulating layer 24 -magnetic film layer 25 -insulating layer 24 -magnetic film layer 25 -insulating layer 24 - . . . -insulating layer 24 -the upper nonmagnetic substrate 23 ”, as shown in FIG. 2.
- the magnetic recording head element 28 on the left-hand side in the uppermost magnetic recording head layer 21 and the magnetic recording head element 28 on the right-hand side in the bottom magnetic recording head layer 21 are positioned such that they do not overlap in the direction of lamination and that their edge lines on either side nearest to the other are linearly aligned in the direction of lamination (see FIG. 2).
- this magnetic recording head 20 is fabricated using the thin film process, and if an alignment error between any two adjacent magnetic recording head elements 28 and 28 in the direction of lamination is assumed to be 0.051 ⁇ m, a maximum alignment error between the bottom magnetic recording head element 28 and the uppermost magnetic recording head element 28 can be suppressed to:
- a problem of the alignment errors that must be considered among these eight pieces of the magnetic recording head elements 28 , 28 , . . . , 28 is only in the direction of the lamination.
- an allowable range of the ratio of displacement relative to the head width W 1 was set to be 20%, however, this is only one example, and it may be arranged also such that if its allowable range is large, the number of laminations may be increased, conversely, if its allowable range is small, the number of laminations may be reduced.
- the magnetic recording head 20 thus assembled is mounted on the rotary drum 12 so that a direction of scanning thereof with respect to the tape-form recording medium 4 coincides with the direction of the lamination described above (refer to FIG. 4).
- the magnetic recording head 20 of the present invention described above, there have been accomplished such advantages that the width of each of magnetic recording head elements 28 , 28 , . . . , 28 can be reduced, and alignment errors between each of magnetic recording head elements 28 , 28 , . . . , 28 can be minimized, thereby allowing for the magnetic recording head 20 to record a narrower and higher density record track, implementing an enhanced multi-channeling with a further increased number of channels (see FIG. 5).
- any two magnetic recording head elements 28 and 28 adjacent in the direction of lamination share a common insulating layer 24 therebetween, thereby allowing to omit one of the lamination processes, hence realizing a cost reduction in the manufacture.
- the magnetic recording head 20 is described by way of example in which the magnetic recording head elements 28 , 28 , . . . , are laminated in the number of four, however, the number of laminations thereof is not limited thereto, and it may be two, three or any number, provided that a final alignment error between the laminated magnetic recording head elements 28 , 28 , . . . is within an allowable range.
- the above magnetic recording head 20 is described by way of example, in which the four layers of magnetic recording head layers 21 , 21 , . . . , 21 are formed so as to be hold between the upper and the bottom non-magnetic substrates 22 and 23 , however, this example is directed to a magnetic recording head suitable for use with the tape-form recording medium 4 , and in the case for use with a disk-shaped recording medium, it may be arranged such that the aforementioned insulating layers 24 , 24 , . . . and magnetic recording head layers 21 , 21 , . . . are alternately laminated on one common non-magnetic substrate.
- the magnetic recording head elements 28 , 28 adjacent in the direction of lamination are formed such that their left and right edge portions match, it is not limited to such configuration, so that the edge portions may be arranged to partially overlap.
- a recording track can be formed narrower than the head width of the magnetic recording head element 28 .
- it is arranged such that a magnetic recording head element 28 on the left side in the uppermost layer and a magnetic recording head element 28 on the right side in the bottom layer do not overlap as viewed from the direction of lamination, and both edge portions thereof are disposed so as to match or be slight separated from each other. Because recording tracks Tr, Tr, . . .
- the four pieces of the magnetic recording head elements 28 , 28 , . . . 28 in lamination as provided in the magnetic recording head layers 21 are arranged to share a common insulating layer 24 therebetween, however, it is not limited thereto, and there may be formed individual insulating layers 24 , 24 for each magnetic recording head layer 21 as well.
- a second exemplary preferred embodiment of the present invention is shown in FIG. 6 and FIG. 7.
- a magnetic recording head 20 A according to the second embodiment of the present invention is similar in that it has eight pieces of magnetic recording head elements, but differs in that a distance between two pieces of the magnetic recording head elements formed on a same film layer is different from that in the first preferred embodiment. This difference will be mainly described in the following, however omitting description of the other parts that are similar to the first embodiment and labeling such parts with a similar numerals.
- Each magnetic recording head elements 28 A, 28 A, . . . , 28 A in the laminated magnetic recording layers 21 A, 21 A, . . . , 21 A are formed to have a positional relationship such that both edge lines on the adjacent side of any two pieces of the head elements 28 A, 28 A adjacent in the direction of lamination match.
- восем ⁇ pieces of magnetic recording head elements 28 A, 28 A, . . . , 28 A in lamination can be divided into two groups of a left side group 35 L including four pieces of the magnetic recording head elements on the left-hand side (hereinafter, referred to as the “left-side magnetic pole group”) and a right side group 35 R including four pieces of the magnetic recording head elements on the right-hand side (hereinafter, referred to as the “right-side magnetic pole group”).
- the magnetic recording head 20 A thus formed is disposed in the notch in the rotary drum 12 likewise the magnetic recording head 20 according to the first preferred embodiment of the present invention.
- each of the magnetic pole groups 35 L and 35 R are made scan at respective positions displaced from each other by a distance corresponding to two unit widths of the magnetic groups 35 R and 35 L as indicated in FIG. 7.
- the magnetic recording head 20 A is assured to form recording tracks Tr, Tr, . . . , Tr in a lateral direction of the recording track Tr without guard band after making three revolutions (refer to FIG. 7).
- the magnetic recording head 20 A according to this second embodiment of the present invention likewise the case of the magnetic recording head 20 according to the first preferred embodiment, because that a width of each of the magnetic recording head elements 28 A, 28 A, . . . can be reduced and that an alignment error between each of the magnetic recording head elements 28 A, 28 A, . . . can be minimized, narrower recording tracks with higher density can be formed, thereby permitting realizing a magnetic recording head 20 A able to respond to increasing multi-channeling.
- FIGS. 8 to 10 A third exemplary preferred embodiment of the present invention is shown in FIGS. 8 to 10 , as applied to a magnetic reproducing head having eight pieces of magneto-resistive effect thin film heads (hereinafter referred to as MR head).
- MR head magneto-resistive effect thin film heads
- FIG. 8 shows a schematic diagram of an enlarged view of the magnetic reproducing head 40 as a frontal view in contact with a tape-form recording medium 4 .
- the magnetic reproducing head 40 is formed by interposing four layers of magnetic reproducing head layers 41 , 41 , . . . , 41 between two non-magnetic substrates 42 , 43 and also between two insulating layers 44 , 44 from the upper and the bottom directions.
- the insulating layer 44 is formed by laminating the insulating layer 44 on the bottom non-magnetic substrate 42 , a plurality of magnetic reproducing head layers 41 , 41 , . . . on the insulating layer 44 , the upper insulating layer 44 thereon, and fin totaly the upper non-magnetic substrate 43 (refer to FIG. 8).
- each of the plurality of magnetic reproducing head layers 41 includes two magnetic shielding layers 45 , 45 ; a MR head (corresponding to a magnetic reproducing head element) interposed between the two magnetic shielding layers 45 , 45 ; and hard films 47 , 47 which are positioned in a similar layer as the MR head 46 and firmly hold the MR head 46 from both sides thereof.
- the hard film 47 by firmly holding the MR head 46 from the both sides thereof, gives a horizontal bias to the MR head 46 , as shown in FIG. 8.
- each MR head 46 includes sequentially laminating, from the bottom, a SAL (soft adjacent layer) film 48 , an intermediate separation film (insulating film) 49 , and a magneto-resistive effect film (MR element) 50 , as shown in FIG. 8.
- SAL soft adjacent layer
- insulating film intermediate separation film
- MR element magneto-resistive effect film
- the magnetic reproducing head lamination layer 41 there are disposed two pieces of MR head 46 , 46 in the head width direction separated from each other by a predetermined distance.
- the magnetic reproducing head 40 thus assembled has eight pieces of MR heads 46 , 46 , . . . , 46 in total, as shown in FIG. 8.
- any two pieces of the MR heads 46 , 46 adjacent via a magnetic shielding layer 45 in the direction of lamination are arranged so as to share one layer of a common magnetic shielding layer 45 existing therebetween.
- the magnetic reproducing head 40 is formed by alternately laminating five magnetic shielding layers 45 , 45 , . . . , 45 and four pieces of MR heads 46 , 46 , . . . , 46 or hard films 47 , 47 , . . .
- a positional relationship between each MR heads 46 , 46 , . . . , 46 in the magnetic reproducing head layers 41 , 41 , . . . , 41 in lamination is arranged such that both edge lines on their adjacent side of any two MR heads 46 , 46 adjacent in the direction of lamination are formed so as to approximately match.
- a MR head 46 on the left side in the uppermost magnetic reproducing head layer 41 and a MR head 46 on the right side in the bottom magnetic reproducing head layer 41 are formed in such a manner that they do not overlap with each other as viewed from the direction of lamination, and that both edge lines closer to each other are aligned in the direction of lamination, as shown in FIG. 8.
- the magnetic reproducing head 40 which is fabricated by the thin film process has such an advantage that if an alignment error between any two MR heads 46 and 46 adjacent in the direction of lamination is 0.05 ⁇ m, a maximum alignment error induced between the uppermost MR head 46 and the bottom MR head 46 may be suppressed to be within
- a problem of alignment errors that must be considered between these eight pieces of MR heads 46 , 46 , . . . , 46 resides only in the direction of lamination of those MR heads.
- the allowable range of displacement relative to the head width of the MR head 46 is 20%, however, it is only an example, and not limited thereto. If its allowable range is large, the number of lamination can be increased, conversely, if its allowable range is narrow, the number of lamination can be decreased accordingly.
- the magnetic reproducing head 40 assembled as described above is mounted on the rotary drum 12 so that its scanning direction on the tape-form recording medium 4 coincides with the direction of lamination thereof, as shown in FIG. 9.
- the width of MR heads 46 , 46 , . . . , 46 can be reduced and the alignment error between MR heads can be minimized, thereby enabling to reproduce information from a narrower recording track with higher density, and hence realizing magnetic reproducing head 40 featuring a multi-channeling capability with an increased number of channels, as shown in FIG. 10.
- any two MR heads 46 , 46 adjacent in the direction of lamination of the four pieces of the MR heads 46 , 46 , . . . , 46 on either sides of the lamination are arranged to share a common magnetic shielding layer 45 therebetween, one of the lamination processes can be omitted thereby reducing the cost of manufacture.
- the third preferred embodiment of the present invention described above has been set forth by way of example of the magnetic reproducing head 40 in which four layers of the magnetic reproducing head layers embedding four pieces of MR heads 46 , 46 , . . . , 46 on both sides thereof are laminated, however, the number of laminations is not limited thereto, so that it may be two, three or any number, provided that the alignment error between the MR heads 46 , 46 , . . . , 46 falls within its allowable range.
- the above magnetic reproducing head 40 is described by way of example, in which the magnetic reproducing head layers 41 , 41 , . . . , 41 are formed as sandwiched between the upper and the lower nonmagnetic substrates 42 and 43 , the arrangement of which is suitable as a magnetic reproducing head for use with a recording medium in tape form, however, it is not limited thereto, and in the case for use with a disk-shaped recording medium, its magnetic reproducing head may be comprised by laminating the aforementioned magnetic shielding layers 45 , 45 , . . . , 45 , and magnetic reproducing head layers 41 , 41 , . . . , 41 alternately on one common nonmagnetic substrate.
- any two MR heads 46 and 46 adjacent in the direction of lamination are formed so that the left edge line of the one on the right-hand side and the right edge line of the other on the left-hand side are aligned in the direction of lamination, however, it is not limited thereto, and both edge portions adjacent may be formed partially to overlap as well.
- MR heads 46 , 46 , . . . , 46 may be formed corresponding thereto.
- a non-tracking reproduction described in the magnetic reproducing head according to its third preferred embodiment disclosed in the aforementioned JP-A Laid-Open No. 2000-348377 can be achieved.
- a magnetic reproducing head 40 A according to this modified version includes further forming an intermediate insulating layer 51 between the magnetic reproducing head layers 41 and 41 .
- the magnetic reproducing head 40 A is formed by alternately laminating four layers of magnetic reproducing layers 41 , 41 , . . . , 41 and three layers of intermediate insulating layers 51 , 51 , . . . , 51 , for example, such as “a bottom nonmagnetic substrate 42 -insulating layer 44 -magnetic reproducing head layer 41 -intermediate insulating layer 51 -magnetic reproducing head layer 41 -intermediate insulating layer 51 -magnetic reproducing head layer 41 -intermediate insulating layer 51 -magnetic reproducing head layer 41 -intermediate insulating layer 51 -magnetic reproducing head layer 41 -insulating layer 44 -upper nonmagnetic substrate 43 ”, as shown in FIG. 11.
- a magnetic reproducing head 40 B according to the fourth preferred embodiment of the present invention is similar to the magnetic reproducing head 40 according to the first preferred embodiment of the present invention in that there are provided eight pieces of MR heads, however, it differs in that a distance between two MR heads formed in a same film layer is different therefrom. This difference will be described specifically in the following, omitting description of the other portions which are a similar or similar as in the magnetic reproducing head 40 according to the third preferred embodiment, and labeled with the same numerals.
- the arrangement of MR heads 46 A, 46 A, . . . , 46 A in the magnetic reproducing head 40 B according to the fourth preferred embodiment of the present invention is approximately a similar as that of the magnetic recording head elements 28 A, 28 A, . . . , 28 A in the magnetic recording head 20 A according to the second preferred embodiment of the present invention as shown in FIG. 12.
- the eight pieces of the MR heads 46 A, 46 A, 46 A as laminated are divided into two groups of 46 L which includes four pieces of MR heads on the left-hand side (hereinafter, referred to as the left-side MR head group) and 46 R which includes the other four pieces of MR heads on the right-hand side (hereinafter, referred to as the right-side MR head group).
- the magnetic reproducing head 40 B thus formed is disposed in the notch of the rotary drum 12 in a similar manner as the magnetic reproducing head 40 according to the first preferred embodiment.
- the MR head groups 46 L and 46 R are made scan a position on the recording tracks Tr, Tr, . . . , Tr displaced by a amount corresponding to a width of two MR head groups of 46 L and 46 R, as indicated in FIG. 13.
- FIG. 14 a fifth preferred embodiment of the present invention is shown, which is applied to a magnetic head which has eight pieces of MR heads and eight pieces of magnetic recording head elements.
- FIG. 14 is a schematic diagram showing an enlarged portion of a magnetic head 60 according to a fifth preferred embodiment of the present invention, as a frontal view having contact with a tape-form recording medium 4 .
- the magnetic head 60 is formed by alternately laminating four layers of magnetic recording head layers 61 , 61 , . . . , 61 and four layers of magnetic reproducing head layers 62 , 62 , . . . , 62 on a bottom nonmagnetic substrate 63 , then an upper nonmagnetic substrate 64 on an uppermost magnetic reproducing head layer 62 .
- each magnetic recording head layer 61 described above has a similar structure as that in the first preferred embodiment
- each magnetic reproducing head layer 62 described above has a similar structure as that in the third preferred embodiment.
- each magnetic recording head elements 28 , 28 in a magnetic recording head layer 61 and each MR heads 46 , 46 in a magnetic reproducing head layer 62 immediately thereon are formed to match with each other in a positional relationship as viewed from the direction of lamination.
- each of two magnetic recording head elements 28 , 28 in the magnetic recording head 61 and each of two MR heads 46 , 46 in the magnetic reproducing head layer 62 laminated on the layer 61 are disposed corresponding to each other, forming a pair, as shown in FIG. 14.
- each magnetic recording head elements 28 , 28 , . . . , 28 and each MR heads 46 , 46 , . . . , 46 can be reduced, and also, an alignment error between each magnetic recording head elements 28 , 28 , . . . , 28 and each MR heads 46 , 46 , . . . , 46 can be minimized.
- recording and reproducing of information to and from narrower recording tracks with higher density are enabled, thereby providing an improved multi-channeling capability to the magnetic head 60 .
- both of the pair can be formed in closest proximity, thereby enabling to minimize an alignment error in the direction of the head width for the pair of the magnetic recording head element 28 and the MR head 46 to the least.
- FIG. 15 a sixth preferred embodiment of the present invention is shown, which is applied to a magnetic head which has eight pieces of MR heads and eight pieces of magnetic recording head elements.
- FIG. 15 is a schematic diagram of a magnetic head 70 according to the sixth preferred embodiment, and shows a frontal view in enlargement as a frontal view having contact with a tape-form recording medium 4 .
- the magnetic head 70 is formed by sequentially laminating four layers of magnetic recording head layers 71 , 71 , . . . , 71 to form a magnetic recording head layer group 73 on a bottom nonmagnetic substrate 72 , then sequentially laminating four layers of magnetic reproducing head layers 74 , 74 , . . . , 74 to form a magnetic reproducing head layer group 75 on the magnetic recording head layer group 73 , and laminating an upper nonmagnetic substrate 76 on the magnetic reproducing head layer group 75 .
- each magnetic recording head layer 71 has a similar structure as that in the first preferred embodiment
- each magnetic reproducing head layer 74 has a similar structure as that in the third preferred embodiment of the present invention.
- a positional relationship between each magnetic recording head elements 28 , 28 , . . . , 28 in the magnetic recording head layer group 73 is similar to that between each magnetic recording head elements 28 , 28 , . . . , 28 in the magnetic recording head 20 according to the first preferred embodiment, and further, a positional relationship between each MR heads 46 , 46 , . . . , 46 in the magnetic reproducing head layer group 75 is similar to that between the each MR heads, 46 , 46 , . . . , 46 in the magnetic reproducing head 40 according to the third preferred embodiment of the present invention.
- magnetic recording head elements 28 , 28 in each magnetic recording head layer 71 in the magnetic recording head layer group 73 and MR heads 46 , 46 in each magnetic reproducing head layer 74 in the magnetic reproducing head layer group 75 are formed in a same relative position in the head width direction, forming respective pairs in a vertical direction, as shown in FIG. 15.
- each magnetic recording head elements 28 , 28 , . . . , 28 and of each MR heads 46 , 46 , 46 can be minimized, and also an alignment error between each magnetic recording head elements 28 , 28 , . . . , 28 as well as each MR heads 46 , 46 , . . . , 46 can be minimized, thereby enabling to record and reproduce information to and from a narrower and higher density recording track, and thereby providing an improved multi-channeling capability to the magnetic head 70 .
- a plurality of the magnetic reproducing head layers 74 , 74 , . . . , 74 are laminated thereon, thereby enabling to simplify the manufacturing process.
- FIG. 16 is a plan view showing a schematic diagram of a disk drive using the magnetic head 60 or 70 described above.
- a disk drive 80 is provided with a drive mechanism 82 for rotating a disk-shaped recording medium 81 , and a head transport mechanism 83 for transporting the magnetic head 60 or 70 in a radius direction of the disk-shaped recording medium 81 , wherein the head transport mechanism 83 is comprised of a head slider 84 for supporting the magnetic head 60 or 70 , a suspension 85 for allowing the head slider 84 to make an elastic contact with the disk-shaped recording medium 81 , and a suspension arm 86 connected to the head transport mechanism 83 for supporting the suspension 85 , as shown in FIG. 16.
- the magnetic head 60 or 70 supported by the head slider 84 performs recording or reproducing of a signal to and from the disk-shaped recording medium 81 .
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Abstract
A magnetic recording/reproducing head having a plurality of magnetic head elements for multi-channeling capable of achieving high density recording/reproducing capability, including: a plurality of magnetic recording/reproducing head layers each including magnetic recording/reproducing head elements fabricated by a thin film process and interposed between two insulating/magnetic shielding layers laminated on a non-magnetic substrate; the total of magnetic recording/reproducing head elements formed therein are displaced from each other in a head width direction, and each magnetic recording/reproducing head layer has a plurality of magnetic recording/reproducing head elements formed at a predetermined pitch.
Description
- The present document is based on Japanese Priority Application JP2002-140556, filed in the Japanese Patent Office on May 15, 2002, the contents of which being incorporated herein by reference to the extent permitted by law.
- 1. Field of the Invention
- The present invention relates to a magnetic recording head, a magnetic reproducing head, a magnetic head, a tape drive and a disk drive using a similar, and in particular, relates to a technology for facilitating arrangement of a plurality of magnetic heads (including both magnetic recording heads and magnetic reproducing heads) (hereinafter referred to as multiplicity of magnetic heads) in order to achieve higher recording density.
- 2. Description of the Related Art
- Recently, in order to realize large capacity of storage for magnetic recording media, an increasingly higher recording density is required for magnetic heads, so that the use of magnetic heads suitable for reducing a recording track width thereof (hereinafter referred to as “width reduction”) has been increasing.
- Further, in order to realize a large capacity storage and a high density in magnetic recording and reproducing of information, provision of a multiplicity of channels is desired (hereinafter referred to as a “multi-channeling”), and hence a multi-channeled magnetic head is on demand.
- As an example of such type of a multi-channeled magnetic head, there is, for example, a head that is formed by laminating a plurality of magnetic recording head elements or magnetic reproducing head elements on one common substrate via a magnetic shielding layer, an insulating layer and the like has been proposed by the present applicant of the present invention.
- A magnetic head disclosed in the JP-A Laid-Open No. 2001-6750 is directed to a magnetic recording head, and a magnetic head disclosed in the JP-A Laid-Open No. 2000-348377 is directed to a magnetic reproducing head.
- Both of those magnetic heads mentioned above are formed by laminating a plurality of magnetic recording head layers or magnetic reproducing head layers, each layer including a single magnetic head element, on a substrate made of a non-magnetic substance, and displacing all magnetic head elements from each other in an orthogonal direction relative to a direction of lamination thereof (herein after referred to as a “head width direction”).
- As a result, multi-channeling of the magnetic head is enabled, and each magnetic head element is placed in proximity or overlapped in the direction of the head width thereby enabling to respond to narrower recording track.
- The number of channels required for a magnetic recording medium nowadays is not limited to 2 channels or 4 channels, but several tens of channels, for example, 40 channels or more are demanded. This is because that in the field of information recording, a further speedup in recording speed and/or reproducing speed is desired, thereby necessitating a provision of a greater multiplicity of channels for recording and reproducing information to and from a recording medium.
- In the above-mentioned magnetic recording head or the magnetic reproducing head, if a magnetic head having, for example, 40 channels is to be fabricated, magnetic head layers each having a magnetic head element must be laminated as many as 40 layers.
- However, when a plurality of magnetic head layers are laminated, there occurs a problem that, due to an error in accuracy of positioning (alignment error) between each magnetic head element in its width direction, a displacement between the top magnetic head element and the bottom magnetic head element in the head width direction becomes considerably large.
- In other words, when forming a magnetic head element having a head width of, for example, 1 μm, an alignment error between two magnetic head elements adjacent in the direction of lamination is considered to be approximately 0.05 μm.
- This is caused by the fact that, when forming magnetic head elements by a thin film processing, each layer thereof is formed by masking with a mask and depositing a film, however, there is a limit to securing accuracy in positioning of each masking in the lamination.
- Then, for example, in the case described above in which the magnetic head layers having the magnetic head element having the head width of 1 μm are laminated as many as 40 layers, a maximum displacement between the uppermost and the bottom magnetic head elements becomes:
- 0.05 μm×40=2 μm,
- Hence, a ratio of displacement relative to the width of the magnetic head element (equal to a track width in the case of the magnetic recording head element) becomes substantially large so that it cannot be ignored.
- As a result, there is a limit to the number of laminations allowable for the magnetic head layers, thereby preventing the multi-channeling, and in consequence, the higher recording density and reproducing of information.
- The present invention has been contemplated in view of the above-mentioned problems associated with the conventional technology, and to achieve a further improvement in the recording and reproducing density by an increased multi-channeling of the magnetic head elements.
- A magnetic recording head according to a preferred embodiment of the present invention includes a plurality of magnetic recording head layers laminated on a substrate made of a non-magnetic material, each of the plurality of magnetic recording head layers including magnetic recording head elements fabricated by a thin film process and interposed between two insulating layers, and all of the magnetic recording head elements being displaced from each other in a head width direction constituting an orthogonal direction relative to a direction of lamination, the plurality of magnetic recording head layers comprising a plurality of magnetic recording head elements formed at a predetermined pitch.
- According to another preferred embodiment of the present invention, there is provided a tape drive having a magnetic recording head for recording a signal on a recording medium in tape form and a tape running means for running the recording medium in tape form along a predetermined run path; the magnetic recording head includes a plurality of magnetic recording head layers laminated on a substrate made of a non-magnetic material, each of the plurality of magnetic recording head layers including magnetic recording head elements interposed between two insulating layers, all of the magnetic recording head elements formed therein being displaced from each other in a head width direction constituting an orthogonal direction relative to a direction of lamination thereof; and said plurality of magnetic recording head layers includes a plurality of magnetic recording head elements formed at a predetermined pitch.
- As a result, according to the preferred embodiments of the present invention, as the plurality of magnetic recording head elements are formed at a predetermined pitch in each magnetic recording head layer, recording tracks are formed on the recording medium using a number of magnetic reproducing head elements corresponding to an integer multiple (two or more) of the number of laminations.
- As a result, according to the preferred embodiments of the present invention, as the plurality of magnetic recording head elements are formed at a predetermined pitch in each magnetic recording head layer, a width of each magnetic recording head element can be reduced and an alignment error between each recording head elements can be minimized, thereby enabling recording further narrower recording tracks with higher density, hence permitting realizing a multi-channeling capability for the magnetic recording head.
- Further, a magnetic reproducing head device according to another preferred embodiment of the present invention is provided, including a plurality of magnetic reproducing head layers laminated on a substrate made of a non-magnetic material, each of the plurality of the magnetic reproducing head layers including magnetic reproducing head elements fabricated by a thin film process and interposed between two magnetic shielding layers, and all of the magnetic reproducing head elements being displaced from each other in a head width direction constituting an orthogonal direction relative to a direction of lamination; the plurality of magnetic reproducing head layers including a plurality of magnetic reproducing head elements formed at a predetermined pitch.
- According to still another preferred embodiment of the present invention, a tape drive apparatus is provided having a magnetic reproducing head for reproducing a signal from a recording medium in tape form and a tape running means for running the recording medium in tape form along a predetermined transport path; the magnetic reproducing head includes a plurality of magnetic reproducing head layers laminated on a substrate made of a non-magnetic material, each of the plurality of magnetic reproducing head layers having magnetic reproducing head elements fabricated by a thin film process and interposed between two magnetic shielding layers, and all of the magnetic reproducing head elements formed therein being displaced from each other in a head width direction constituting an orthogonal direction relative to the direction of lamination thereof, and the magnetic reproducing head layers include a plurality of magnetic reproducing head elements formed at a predetermined pitch.
- As a result, according to this preferred embodiment of the present invention, as the plurality of magnetic reproducing head elements are formed at a predetermined pitch in each magnetic reproducing head layer, reproduction of information from recording tracks is performed by use of a number of magnetic reproducing head elements corresponding to an integer multiple (two or more) of the number of laminations.
- Further, according to this preferred embodiment of the present invention, as the plurality of magnetic reproducing head elements is formed at a predetermined pitch by the thin film process in each magnetic reproducing head layer, a width of each magnetic reproducing head element can be reduced, and an alignment error between each magnetic reproducing head element can be minimized, thereby enabling to reproduce information from further narrower recording tracks with higher density.
- According to still another preferred embodiment of the present invention, in a magnetic reproducing head, any two magnetic reproducing head elements adjacent in the direction of lamination via a magnetic shielding layer share a common magnetic shielding layer existing therebetween, thereby capable of omitting one step of the lamination processes hence achieving a cost reduction.
- Still further, a magnetic reproducing head according to still another preferred embodiment of the present invention, in which two magnetic reproducing head elements adjacent in the direction of lamination via magnetic shielding layers, further has an insulting layer interposed between two magnetic shielding layers existing between the two magnetic reproducing head elements, thereby enabling to eliminate a crosstalk therebetween, thus permitting achieving higher density.
- Further, a magnetic head according to another preferred embodiment of the present invention includes a plurality of magnetic reproducing head layers each having magnetic reproducing head elements fabricated by a thin film process and interposed between two magnetic shielding layers and a plurality of magnetic recording head layers each having magnetic recording head elements fabricated by a thin film process and interposed between two insulating films, laminated on a substrate made of a non-magnetic material, and all of the magnetic reproducing head elements being displaced from each other in a head width direction constituting an orthogonal direction relative to a direction of lamination thereof; the magnetic reproducing head layers comprise a plurality of magnetic reproducing head elements formed at a predetermined pitch; the magnetic recording head layers has a plurality of magnetic recording head elements formed at a same pitch as the plurality of magnetic reproducing head elements; and each magnetic reproducing head element and each magnetic recording head element are formed approximately at a similar position in the head width direction, forming a pair.
- Still further, a tape drive according to still another preferred embodiment of the present invention is provided with a magnetic head for recording and reproducing a signal to and from a recording medium in tape form, and a tape running means for running the recording medium in tape form along a predetermined running path; the magnetic head includes a plurality of magnetic reproducing head layers each having magnetic reproducing head elements fabricated by a thin film process and interposed between two magnetic shielding layers, and a plurality of magnetic recording head layers each having magnetic recording head elements fabricated by a thin film process and interposed between two insulating layers, laminated on a substrate made of a non-magnetic material, all of the magnetic reproducing head elements therein being displaced from each other in a head width direction constituting an orthogonal direction relative to the direction of lamination, and all of the magnetic recording head elements therein being displaced from each other in the head width direction; each magnetic reproducing head layer includes a plurality of magnetic reproducing head elements formed at a predetermined pitch; each magnetic recording head layer includes a plurality of magnetic recording head elements formed at a similar pitch as that of the plurality of the magnetic reproducing head elements, and each magnetic reproducing head element and each magnetic recording head element are formed approximately at a similar position in the head width direction, forming a pair.
- A disk drive according to still another preferred embodiment of the present invention is provided with a magnetic head for recording and reproducing a signal to and from a disk-shaped recording medium, and a drive mechanism for rotating the disk-shaped recording medium; the magnetic head includes: a plurality of magnetic reproducing head layers each including magnetic reproducing head elements fabricated by a thin film process and interposed between two magnetic shielding layers; and a plurality of magnetic recording head layers each including magnetic recording head elements fabricated by a thin film process and interposed between two insulating layers, both being laminated on a substrate made of a non-magnetic material, all of the magnetic reproducing head elements formed therein being displaced from each other in a head width direction constituting an orthogonal direction relative to a direction of lamination, and all of the magnetic recording head elements formed therein being displaced from each other in the head width direction; each magnetic reproducing head layer includes a plurality of magnetic reproducing head elements formed at a predetermined pitch; each magnetic recording head layer includes a plurality of magnetic recording head elements formed at a similar pitch as that of the plurality of magnetic reproducing head elements; and each magnetic reproducing head element and each magnetic recording head element are formed approximately at a similar position in the head width direction, forming a pair.
- As a result, according to the preferred embodiments of the present invention, in each magnetic head layer, there are provided a plurality of magnetic reproducing head elements or a plurality of magnetic recording head elements formed at a predetermined pitch respectively, thereby the magnetic head having a number of the magnetic reproducing heads and the magnetic recording heads corresponding to an integer multiple of the number of laminations (two or more) in order to reproduce and record information to and from recording tracks.
- According to the preferred embodiments of the present invention, as in respective magnetic head layers there is provided a plurality of magnetic reproducing head elements and a plurality, of magnetic recording head elements, formed at a predetermined pitch, a width of each magnetic recording head element and each magnetic reproducing head element can be reduced, and alignment errors between respective magnetic recording head elements or respective magnetic reproducing head elements can be minimized, thereby enabling to record and reproduce information to and from narrower and higher density recording tracks, thereby providing a magnetic recording and reproducing head capable of coping with a trend towards an ever increasing multi-channeling.
- In addition, according to the preferred embodiments of the present invention, magnetic reproducing head layers and magnetic recording head layers are alternately laminated to provide a pair of a magnetic reproducing head element and a magnetic recording head element adjacent in the direction of lamination via a magnetic shielding layer and an insulating layer, and the pair of the magnetic recording head elements and the magnetic reproducing head elements residing in a magnetic recording head layer and in a magnetic reproducing head layer respectively adjacent to each other in the direction of lamination, both of the pair can be formed in proximity to each other, thereby enabling to minimize an alignment error in the head width direction between each magnetic recording head element and each reproducing head element of the pair.
- According to the preferred embodiments of the present invention, as after a plurality of magnetic reproducing head layers are laminated to form a magnetic reproducing head layer group, a plurality of magnetic recording head layers are laminated to form a magnetic recording head group, then, the magnetic reproducing head layer group and the magnetic recording head layer group are laminated, a manufacturing process thereof is substantially simplified.
- In other words, as environmental conditions such as temperature at the time of manufacture of the magnetic recording head layer or of the magnetic reproducing head layer differ, if it is arranged so as to change the environment after completion of the manufacture of the magnetic recording head layer for a subsequent manufacture of the magnetic reproducing head layer, an alteration cycle of the process environment can be reduced to once, thereby substantially simplifying the manufacturing process.
- The above and other objects, features and advantages of the present invention will become more apparent from the following description of the presently preferred exemplary preferred embodiment of the present invention taken in conjunction with the accompanying drawings, in which:
- FIG. 1 is a schematic plan view depicting a conventional a tape drive apparatus;
- FIG. 2 shows, together with FIGS.3 to 5, a first exemplary preferred embodiment of the present invention, and in particular, it depicts a relationship between a magnetic recording head and recording tracks;
- FIG. 3 is a schematic perspective view of a cut-out portion of the magnetic recording head;
- FIG. 4 is a schematic plan view of a rotary drum;
- FIG. 5 is a schematic diagram indicating a positional relationship between recording tracks and the magnetic recording head;
- FIG. 6 shows, together with FIG. 7, a second exemplary preferred embodiment of the present invention, and in particular, it shows a schematic diagram indicating each positional relationship at a first revolution, a second revolution and a third revolution of the magnetic recording head;
- FIG. 7 is a schematic diagram indicating each positional relationship between the magnetic recording head and recording tracks at respective rounds;
- FIG. 8 shows, together with FIGS. 9 and 10, a third exemplary preferred embodiment of the present invention, and in particular, it shows a relationship between a magnetic reproducing head and recording tracks;
- FIG. 9 is a schematic plan view of a rotary drum;
- FIG. 10 is a schematic diagram indicating a positional relationship between recording tracks and the magnetic reproducing head;
- FIG. 11 shows a modified version of the magnetic reproducing head according to the third embodiment of the present invention, and in particular, it shows a positional relationship between its magnetic reproducing head and recording tracks;
- FIG. 12 shows, together with FIG. 13, a fourth embodiment of the present invention, and in particular, it depicts each positional relationship at a first, a second and a third revolutions of the magnetic reproducing head;
- FIG. 13 is a schematic diagram indicating a positional relationship between the magnetic recording head and the recording tracks at each revolution;
- FIG. 14 shows a fifth embodiment of the present invention, and in particular, it shows a diagram indicating a relationship between its magnetic head and recording tracks;
- FIG. 15 shows a sixth embodiment of the present invention, and in particular, it shows a diagram indicating a relationship between its magnetic head and recording tracks; and
- FIG. 16 is a schematic plan view of a disk drive.
- By referring to the accompanying drawings, preferred embodiments of the present invention are described in detail.
- First, an overview of a conventional tape drive will be described by referring to FIG. 1.
- A
tape drive 1 is provided with: arotary drum unit 2; guidepins form recording medium 4 by pulling it out from atape cassette 3 and winding around therotary drum unit 2; reel tables 7, 7 for supportingreels tape cassette 3; acapstan axis 9 for running the tape-form recording medium 4 in collaboration with a pinch roller 8, and so on, as shown in FIG. 1. - The
rotary drum unit 2 is mounted with its axial center slightly slanting relative to the plane of achassis 10, and when atape cassette 3 is loaded, its tape-form recording medium 4 is pulled out toward therotary drum unit 2 by the guide pins 5, 5, . . . to be wound around therotary drum 2, and at a similar time, the tape-form recording medium 4 is gripped between the pinch roller 8 and thecapstan axis 9 thereby forming a tape run path, as shown in FIG. 1. - FIG. 1 schematically illustrates a state in which the
tape cassette 3 is loaded in thetape drive apparatus 1 and the tape path is formed. - After the tape path is formed, when the
rotary drum 2 and thecapstan axis 9 are rotated, the tape-form recording medium 4 is caused to run along the tape run path at a constant speed. - By way of example, the above-mentioned parts such as “guide pins5, pinch roller 8,
capstan axis 9′ correspond to a tape running means for running a recording medium in tape form along a predetermined running path” as will be described later. - The
rotary drum unit 2 described above is provided with astationary axis 11 mounted on thechassis 10, arotary drum 12 rotatably supported by thestationary axis 11 via a bearing (not shown), and astationary drum 13 disposed under therotary drum 12 and fixed to thechassis 10, thestationary drum 13 and therotary drum 12 being mounted opposing to each other and having a predetermined clearance there between; a notch (not shown) is formed in a bottom edge portion in a perimeter of therotary drum 12, and in the notch there are disposed amagnetic recording head 20, a magnetic reproducinghead 40 or amagnetic head 60, described later. - FIG. 2 to FIG. 5 show a first exemplary preferred embodiment of the present invention, in which a
magnetic recording head 20 having eight pieces of magnetic recording head elements is mounted on itsrotary drum 2. - FIG. 2, which is a schematic diagram of an enlarged portion of the
magnetic recording head 20, shows a frontal view as seen from a side thereof in contact with the tape-form recording medium 4. - The
magnetic recording head 20, as shown in FIG. 2, is formed by sequentially laminating four layers of magnetic recording head layers 21, 21, . . . on a bottom non-magnetic substrate 22, and an uppernon-magnetic substrate 23 on the uppermost magneticrecording head layer 21. - Each magnetic
recording head layer 21 has two insulatinglayers magnetic film layer 25 interposed between these insulatinglayers magnetic pole 26 is formed on themagnetic film layer 25 partially protruding in an upper direction as viewed from the front side, and an uppermagnetic pole 27 formed over the bottommagnetic pole 26 spaced apart therefrom with a predetermined distance (hereinafter referred to as gap) G, which in combination form a magneticrecording head element 28 as shown in FIG. 2. - More specifically, the magnetic
recording head element 28 is formed by winding acoil 30 around acore 29 formed in a U-shape as viewed from a lateral direction, wherein the upper and bottom end portions of the core 29 correspond to theupper pole piece 27 and thebottom pole piece 26, as illustrated in FIG. 3. - By applying a current through the
coil 30, a magnetic field is induced in the gap G between theupper pole piece 26 and thebottom pole piece 27, thereby enabling to form a record track Tr in the tape-form recording medium 4 running in contact with or in proximity to the gap G as shown in FIG. 2. - This magnetic
recording head element 28 is formed to have a width (head width W1), for example, W1=1 μm, and a gap G of G=0.1 μm (see FIG. 2). - The bottom and the upper
non-magnetic substrates 22 and 23 are made of AlTiC, for example. The insulating layers 24, 24, . . . are made of, for example, Al2O3. Further, the magneticthin film layer 25 is preferably made of a ferromagnetic material such as, for example, Ni—Fe (Permalloy), Si—Al—Fe (Sendust), amorphous iron core material (highly magnetically permeable thin film) and the like. - In one magnetic
recording head layer 21 there are disposed two magneticrecording head elements magnetic recording head 20 thus assembled according to the first embodiment of the present invention has eight pieces of the magneticrecording head elements - Any two magnetic
recording head elements layer 24 are made share one common layer of insulatinglayer 24. As a result, themagnetic recording head 20 is composed by alternately laminating five layers of insulatinglayers non-magnetic substrate 23, more specifically such as “the bottom nonmagnetic substrate 22-insulating layer 24-magnetic film layer 25-insulating layer 24-magnetic film layer 25-insulating layer 24- . . . -insulating layer 24-the uppernonmagnetic substrate 23”, as shown in FIG. 2. - As to a positional relationship between each magnetic
recording head elements recording head elements recording head elements - Further, a distance ω1 between the two magnetic
recording head elements recording head layer 21 is formed to be ω1=3 μm. As a result, the magneticrecording head element 28 on the left-hand side in the uppermost magneticrecording head layer 21 and the magneticrecording head element 28 on the right-hand side in the bottom magneticrecording head layer 21 are positioned such that they do not overlap in the direction of lamination and that their edge lines on either side nearest to the other are linearly aligned in the direction of lamination (see FIG. 2). - Accordingly, all of the eight pieces of the magnetic
recording head elements magnetic recording head 20 thus constructed are ensured to be positioned without overlapping in the direction of lamination. - Further, as this
magnetic recording head 20 is fabricated using the thin film process, and if an alignment error between any two adjacent magneticrecording head elements recording head element 28 and the uppermost magneticrecording head element 28 can be suppressed to: - 4×0.05 μm=0.2 μm.
- Still further, because the two magnetic
recording head elements recording head layer 21 are formed with a same mask, there is almost no alignment error between these two magneticrecording head elements - Therefore, a problem of the alignment errors that must be considered among these eight pieces of the magnetic
recording head elements magnetic recording head 20 of this first embodiment of the present invention, as described above, a ratio of displacement relative to the width of W1=1 μm of the magneticrecording head element 28 can be suppressed within 20%, which is within a range that does not affect the recording of recording tracks Tr, Tr, . . . . - In addition, in order to increase the number of channels, instead of merely increasing the number of laminations, it is possible to increase the number of magnetic
recording head elements recording head layer 21, thus an overall positional accuracy (alignment accuracy) among each of magneticrecording head elements - By way of example, in the above description, an allowable range of the ratio of displacement relative to the head width W1 was set to be 20%, however, this is only one example, and it may be arranged also such that if its allowable range is large, the number of laminations may be increased, conversely, if its allowable range is small, the number of laminations may be reduced.
- The
magnetic recording head 20 thus assembled is mounted on therotary drum 12 so that a direction of scanning thereof with respect to the tape-form recording medium 4 coincides with the direction of the lamination described above (refer to FIG. 4). - Hence, according to the
magnetic recording head 20 of the present invention described above, there have been accomplished such advantages that the width of each of magneticrecording head elements recording head elements magnetic recording head 20 to record a narrower and higher density record track, implementing an enhanced multi-channeling with a further increased number of channels (see FIG. 5). - Further, in the first exemplary preferred embodiment of the present invention described above, among the four pieces in lamination of the magnetic
recording head elements recording head elements layer 24 therebetween, thereby allowing to omit one of the lamination processes, hence realizing a cost reduction in the manufacture. - In the description of the first exemplary preferred embodiment of the present invention, the
magnetic recording head 20 is described by way of example in which the magneticrecording head elements recording head elements - Further, the above
magnetic recording head 20 is described by way of example, in which the four layers of magnetic recording head layers 21, 21, . . . , 21 are formed so as to be hold between the upper and the bottomnon-magnetic substrates 22 and 23, however, this example is directed to a magnetic recording head suitable for use with the tape-form recording medium 4, and in the case for use with a disk-shaped recording medium, it may be arranged such that the aforementioned insulatinglayers - Still further, although in the above description of the first embodiment of the present invention, it is set forth that the magnetic
recording head elements recording head element 28. In this case, it is arranged such that a magneticrecording head element 28 on the left side in the uppermost layer and a magneticrecording head element 28 on the right side in the bottom layer do not overlap as viewed from the direction of lamination, and both edge portions thereof are disposed so as to match or be slight separated from each other. Because recording tracks Tr, Tr, . . . , are formed sequentially first by the magneticrecording head elements recording head element 28 positioned on the right side in the bottom layer from being overwritten by the right edge portion of another recording track Tr formed by the magneticrecording head element 28 positioned on the left side in the uppermost layer. - By way of example, in the first exemplary preferred embodiment of the present invention described above, the four pieces of the magnetic
recording head elements layer 24 therebetween, however, it is not limited thereto, and there may be formed individual insulatinglayers recording head layer 21 as well. - A second exemplary preferred embodiment of the present invention is shown in FIG. 6 and FIG. 7. A
magnetic recording head 20A according to the second embodiment of the present invention, as compared with themagnetic recording head 20 according to the first embodiment, is similar in that it has eight pieces of magnetic recording head elements, but differs in that a distance between two pieces of the magnetic recording head elements formed on a same film layer is different from that in the first preferred embodiment. This difference will be mainly described in the following, however omitting description of the other parts that are similar to the first embodiment and labeling such parts with a similar numerals. - Each magnetic
recording head elements head elements recording head elements recording head element - A distance ω2 between the two magnetic
recording head elements recording head layer 21 is set ω2=11 μm (refer to FIG. 6). - That is, as shown in FIG. 6, eight pieces of magnetic
recording head elements left side group 35L including four pieces of the magnetic recording head elements on the left-hand side (hereinafter, referred to as the “left-side magnetic pole group”) and aright side group 35R including four pieces of the magnetic recording head elements on the right-hand side (hereinafter, referred to as the “right-side magnetic pole group”). A gap g2 between these twomagnetic pole groups - As a result, in the
magnetic recording head 20A, a width b2 given between the leftmost edge of a magneticrecording head element 28A and the rightmost edge of a magneticrecording head element 28A is set b2=16 μm to accommodate four magnetic pole groups in total therebetween (see FIG. 6). - The
magnetic recording head 20A thus formed is disposed in the notch in therotary drum 12 likewise themagnetic recording head 20 according to the first preferred embodiment of the present invention. - Then, when the
rotary drum 12 makes one revolution, each of themagnetic pole groups magnetic groups - As a result, the
magnetic recording head 20A is assured to form recording tracks Tr, Tr, . . . , Tr in a lateral direction of the recording track Tr without guard band after making three revolutions (refer to FIG. 7). - Also, in the
magnetic recording head 20A according to this second embodiment of the present invention, likewise the case of themagnetic recording head 20 according to the first preferred embodiment, because that a width of each of the magneticrecording head elements recording head elements magnetic recording head 20A able to respond to increasing multi-channeling. - A third exemplary preferred embodiment of the present invention is shown in FIGS.8 to 10, as applied to a magnetic reproducing head having eight pieces of magneto-resistive effect thin film heads (hereinafter referred to as MR head).
- It should be noted that the arrangement of MR heads in a magnetic reproducing
head 40 according to this third preferred embodiment of the present invention is almost a similar as the arrangement of the magneticrecording head elements magnetic recording head 20 according to the first preferred embodiment of the present invention. - FIG. 8 shows a schematic diagram of an enlarged view of the magnetic reproducing
head 40 as a frontal view in contact with a tape-form recording medium 4. - By referring to FIG. 8, the magnetic reproducing
head 40 is formed by interposing four layers of magnetic reproducing head layers 41, 41, . . . , 41 between twonon-magnetic substrates layers - More specifically, it is formed by laminating the insulating
layer 44 on the bottomnon-magnetic substrate 42, a plurality of magnetic reproducing head layers 41, 41, . . . on the insulatinglayer 44, the upper insulatinglayer 44 thereon, and fin totaly the upper non-magnetic substrate 43 (refer to FIG. 8). - Further, each of the plurality of magnetic reproducing head layers41 includes two magnetic shielding layers 45, 45; a MR head (corresponding to a magnetic reproducing head element) interposed between the two magnetic shielding layers 45, 45; and
hard films MR head 46 and firmly hold theMR head 46 from both sides thereof. Thehard film 47, by firmly holding theMR head 46 from the both sides thereof, gives a horizontal bias to theMR head 46, as shown in FIG. 8. - Further, each
MR head 46 includes sequentially laminating, from the bottom, a SAL (soft adjacent layer)film 48, an intermediate separation film (insulating film) 49, and a magneto-resistive effect film (MR element) 50, as shown in FIG. 8. As theMR head 46 is fabricated by a thin film processing, its width W3 can be formed, for example, W3=1 μm. - In the magnetic reproducing
head lamination layer 41 there are disposed two pieces ofMR head head 40 thus assembled has eight pieces of MR heads 46, 46, . . . , 46 in total, as shown in FIG. 8. - Any two pieces of the MR heads46, 46 adjacent via a
magnetic shielding layer 45 in the direction of lamination are arranged so as to share one layer of a commonmagnetic shielding layer 45 existing therebetween. As a result, the magnetic reproducinghead 40 is formed by alternately laminating five magnetic shielding layers 45, 45, . . . , 45 and four pieces of MR heads 46, 46, . . . ,46 orhard films MR head 46 or hard film 47-magnetic shielding layer 45-MR head 46 or hard film 47-magnetic shielding layer 45- . . . -magnetic shielding layer 45-insulating layer 44-the uppernonmagnetic substrate 43”, as shown in FIG. 8. - A positional relationship between each MR heads46, 46, . . . ,46 in the magnetic reproducing head layers 41, 41, . . . ,41 in lamination is arranged such that both edge lines on their adjacent side of any two MR heads 46, 46 adjacent in the direction of lamination are formed so as to approximately match. As a result, a pitch P3 in the direction of a head width of MR heads 46, 46, . . . , 46 formed in lamination is approximately equal to the width thereof (W3=1 μm).
- In addition, a distance ω3 between the two MR heads 46,46 formed in a similar magnetic reproducing
head layer 41 is set ω3=3 μm. As a result, aMR head 46 on the left side in the uppermost magnetic reproducinghead layer 41 and aMR head 46 on the right side in the bottom magnetic reproducinghead layer 41 are formed in such a manner that they do not overlap with each other as viewed from the direction of lamination, and that both edge lines closer to each other are aligned in the direction of lamination, as shown in FIG. 8. - As a result, all of the eight pieces of the MR heads46, 46, . . . , 46 formed as laminated in the magnetic reproducing
head 40 are displaced not to overlap in the direction of lamination. - Further, the magnetic reproducing
head 40 which is fabricated by the thin film process has such an advantage that if an alignment error between any two MR heads 46 and 46 adjacent in the direction of lamination is 0.05 μm, a maximum alignment error induced between theuppermost MR head 46 and thebottom MR head 46 may be suppressed to be within - 4×0.05 μm=0.2 μm.
- In addition, because the MR heads46, 46 in a similar layer are formed using a same mask, almost no alignment error is originated therebetween.
- Therefore, a problem of alignment errors that must be considered between these eight pieces of MR heads46, 46, . . . , 46 resides only in the direction of lamination of those MR heads. According to the magnetic reproducing
head 40 of the third exemplary preferred embodiment of the present invention, a ratio of displacement relative to a width W3=1 μm of theMR head 46 can be suppressed within 20% as described above, which is within an allowable range without affecting reproduction of the recording tracks Tr, Tr, . . . , Tr. - In addition, if an increase in the number of channels is required, by increasing the number of MR heads46, 46 . . . to be formed in a similar magnetic reproducing
layer 41 instead of increasing the number of lamination, the positional accuracy among MR heads can be further improved, thereby enabling to reproduce a narrower recording track than conventional, and to implement an increased multi-channeling with an increased number of channels. - Hereinabove, it is described that the allowable range of displacement relative to the head width of the
MR head 46 is 20%, however, it is only an example, and not limited thereto. If its allowable range is large, the number of lamination can be increased, conversely, if its allowable range is narrow, the number of lamination can be decreased accordingly. - The magnetic reproducing
head 40 assembled as described above is mounted on therotary drum 12 so that its scanning direction on the tape-form recording medium 4 coincides with the direction of lamination thereof, as shown in FIG. 9. - Hence, according to the magnetic reproducing
head 40 described above, the width of MR heads 46, 46, . . . , 46 can be reduced and the alignment error between MR heads can be minimized, thereby enabling to reproduce information from a narrower recording track with higher density, and hence realizing magnetic reproducinghead 40 featuring a multi-channeling capability with an increased number of channels, as shown in FIG. 10. - In other words, in the case where, for example, a track width of each of the eight recording tracks Tr, Tr, . . . , Tr recorded on the tape-
form recording medium 4 is equal to a track pitch, that is, even if the recording tracks Tr, Tr, . . . , Tr are formed densely packed without guard band therebetween, it is allowed for each of the eight pieces of the MR heads 46, 46, . . . , 46 to scan responding to each of the recording tracks Tr, Tr, . . . , Tr, individually, as shown in FIG. 10. - Further, according to the third preferred embodiment of the present invention, any two MR heads46, 46 adjacent in the direction of lamination of the four pieces of the MR heads 46, 46, . . . , 46 on either sides of the lamination are arranged to share a common
magnetic shielding layer 45 therebetween, one of the lamination processes can be omitted thereby reducing the cost of manufacture. - Further, although not indicated in the figures, according to this magnetic reproducing
head 40 of the third preferred embodiment, as the plurality of MR heads 46, 46 are formed in a similar magnetic reproducing head layer, it is possible to form electric circuits of these MR heads 46, 46 simultaneously in its lamination process, as well as to share a common electric circuit therebetween, hence simplifying the structure. - The third preferred embodiment of the present invention described above has been set forth by way of example of the magnetic reproducing
head 40 in which four layers of the magnetic reproducing head layers embedding four pieces of MR heads 46, 46, . . . , 46 on both sides thereof are laminated, however, the number of laminations is not limited thereto, so that it may be two, three or any number, provided that the alignment error between the MR heads 46, 46, . . . , 46 falls within its allowable range. - Further, the above magnetic reproducing
head 40 is described by way of example, in which the magnetic reproducing head layers 41, 41, . . . , 41 are formed as sandwiched between the upper and the lowernonmagnetic substrates - Still further, according to the third preferred embodiment of the present invention described above, any two MR heads46 and 46 adjacent in the direction of lamination are formed so that the left edge line of the one on the right-hand side and the right edge line of the other on the left-hand side are aligned in the direction of lamination, however, it is not limited thereto, and both edge portions adjacent may be formed partially to overlap as well. Depending on how the recording tracks Tr, Tr, . . . , Tr are formed on the tape-
form recording medium 4, MR heads 46, 46, . . . , 46 may be formed corresponding thereto. By way of example, if the MR heads 46, 46, . . . , 46 are formed partially to overlap in the magnetic reproducinghead 40, a non-tracking reproduction described in the magnetic reproducing head according to its third preferred embodiment disclosed in the aforementioned JP-A Laid-Open No. 2000-348377 can be achieved. - With reference to FIG. 11, a modified version of the magnetic reproducing
head 40 according to the third preferred embodiment of the present invention described above is shown. A magnetic reproducinghead 40A according to this modified version includes further forming an intermediate insulatinglayer 51 between the magnetic reproducing head layers 41 and 41. - That is, the magnetic reproducing
head 40A is formed by alternately laminating four layers of magnetic reproducinglayers layers nonmagnetic substrate 43”, as shown in FIG. 11. - In other words, unlike the magnetic reproducing
head 40 according to the third preferred embodiment of the present invention, in which the magnetic shielding layers 45, 45, . . . are shared between the two magnetic reproducing head layers 41, 41 adjacent in the direction of lamination, because there is provided an intermediate insulatinglayer 51 between any two MR heads 46 and 46 adjacent in the direction of lamination, a crosstalk between these two MR heads 46, 46 may be eliminated, thereby enabling to achieve further higher density recording and reproducing of information. - With reference to FIG. 12 and FIG. 13, a fourth preferred embodiment of the present invention is be described as follows. A magnetic reproducing
head 40B according to the fourth preferred embodiment of the present invention is similar to the magnetic reproducinghead 40 according to the first preferred embodiment of the present invention in that there are provided eight pieces of MR heads, however, it differs in that a distance between two MR heads formed in a same film layer is different therefrom. This difference will be described specifically in the following, omitting description of the other portions which are a similar or similar as in the magnetic reproducinghead 40 according to the third preferred embodiment, and labeled with the same numerals. - It should be noted that the arrangement of MR heads46A, 46A, . . . , 46A in the magnetic reproducing
head 40B according to the fourth preferred embodiment of the present invention is approximately a similar as that of the magneticrecording head elements magnetic recording head 20A according to the second preferred embodiment of the present invention as shown in FIG. 12. - A positional relationship of the MR heads46A, 46A, 46A in the magnetic reproducing
head layers - Furthermore, a distance ω4 between the two pieces of MR heads 46A and 46A formed in a similar magnetic reproducing
layer 41A is set that ω4=11 μm, as shown in FIG. 12. - That is, the eight pieces of the MR heads46A, 46A, 46A as laminated are divided into two groups of 46L which includes four pieces of MR heads on the left-hand side (hereinafter, referred to as the left-side MR head group) and 46R which includes the other four pieces of MR heads on the right-hand side (hereinafter, referred to as the right-side MR head group). Here, it should be noted that the distance g4 between these two
MR head groups - As a result, the magnetic reproducing
head 40B has a width b4 (b4=16 μm) extending from its leftmost edge to its rightmost edge so as to accommodate four groups of MR heads therebetween, as shown in FIG. 12. - The magnetic reproducing
head 40B thus formed is disposed in the notch of therotary drum 12 in a similar manner as the magnetic reproducinghead 40 according to the first preferred embodiment. - When the
rotary drum 12 makes one revolution, theMR head groups - As a result, when the
rotary drum 12 makes three revolutions, the magnetic reproducinghead 40A is made reproduce the whole recording tracks Tr, Tr, . . . , Tr which are densely packed without guard band in the width direction thereof, as shown in FIG. 12 and FIG. 13. - With reference to FIG. 14, a fifth preferred embodiment of the present invention is shown, which is applied to a magnetic head which has eight pieces of MR heads and eight pieces of magnetic recording head elements.
- FIG. 14 is a schematic diagram showing an enlarged portion of a
magnetic head 60 according to a fifth preferred embodiment of the present invention, as a frontal view having contact with a tape-form recording medium 4. - The
magnetic head 60 is formed by alternately laminating four layers of magnetic recording head layers 61, 61, . . . , 61 and four layers of magnetic reproducing head layers 62, 62, . . . , 62 on a bottomnonmagnetic substrate 63, then an uppernonmagnetic substrate 64 on an uppermost magnetic reproducinghead layer 62. - By way of example, each magnetic
recording head layer 61 described above has a similar structure as that in the first preferred embodiment, and each magnetic reproducinghead layer 62 described above has a similar structure as that in the third preferred embodiment. - In addition, each magnetic
recording head elements recording head layer 61 and each MR heads 46, 46 in a magnetic reproducinghead layer 62 immediately thereon are formed to match with each other in a positional relationship as viewed from the direction of lamination. - As a result, in the direction of the head width, each of two magnetic
recording head elements magnetic recording head 61 and each of two MR heads 46, 46 in the magnetic reproducinghead layer 62 laminated on thelayer 61 are disposed corresponding to each other, forming a pair, as shown in FIG. 14. - As a result, according to the
magnetic head 60 laminated as described above, a width of each magneticrecording head elements recording head elements magnetic head 60. - Further, according to the fifth preferred embodiment of the present invention described above, because a pair of a magnetic
recording head element 28 and aMR head 46 reside in the magneticrecording head layer 61 and the magnetic reproducinghead layer 62 adjacent in the direction of lamination, both of the pair can be formed in closest proximity, thereby enabling to minimize an alignment error in the direction of the head width for the pair of the magneticrecording head element 28 and theMR head 46 to the least. - With reference to FIG. 15, a sixth preferred embodiment of the present invention is shown, which is applied to a magnetic head which has eight pieces of MR heads and eight pieces of magnetic recording head elements.
- FIG. 15 is a schematic diagram of a
magnetic head 70 according to the sixth preferred embodiment, and shows a frontal view in enlargement as a frontal view having contact with a tape-form recording medium 4. - The
magnetic head 70 is formed by sequentially laminating four layers of magnetic recording head layers 71, 71, . . . , 71 to form a magnetic recordinghead layer group 73 on a bottomnonmagnetic substrate 72, then sequentially laminating four layers of magnetic reproducing head layers 74, 74, . . . , 74 to form a magnetic reproducinghead layer group 75 on the magnetic recordinghead layer group 73, and laminating an uppernonmagnetic substrate 76 on the magnetic reproducinghead layer group 75. - By way of example, each magnetic recording head layer71 has a similar structure as that in the first preferred embodiment, and each magnetic reproducing
head layer 74 has a similar structure as that in the third preferred embodiment of the present invention. - Further, a positional relationship between each magnetic
recording head elements head layer group 73 is similar to that between each magneticrecording head elements magnetic recording head 20 according to the first preferred embodiment, and further, a positional relationship between each MR heads 46, 46, . . . , 46 in the magnetic reproducinghead layer group 75 is similar to that between the each MR heads, 46, 46, . . . , 46 in the magnetic reproducinghead 40 according to the third preferred embodiment of the present invention. - As a result, magnetic
recording head elements head layer group 73 and MR heads 46, 46 in each magnetic reproducinghead layer 74 in the magnetic reproducinghead layer group 75 are formed in a same relative position in the head width direction, forming respective pairs in a vertical direction, as shown in FIG. 15. - As a result, advantageously, according to the
magnetic head 70 thus fabricated, widths of each magneticrecording head elements recording head elements magnetic head 70. - Still further, according to the sixth preferred embodiment of the present invention, after laminating a plurality of the magnetic recording head layers71, 71, . . . , 71, a plurality of the magnetic reproducing head layers 74, 74, . . . , 74 are laminated thereon, thereby enabling to simplify the manufacturing process.
- That is, because an environment of the process such as temperature differs between the manufacturing of the magnetic recording head layers and manufacturing of the magnetic reproducing head layers, if it is made set up a different process environment after completion of the manufacture of the magnetic recording head layers for starting the lamination of magnetic reproducing head layers, alteration of process environment can be reduced to one time, thereby enabling to simplify the manufacturing process.
- FIG. 16 is a plan view showing a schematic diagram of a disk drive using the
magnetic head - A
disk drive 80 is provided with adrive mechanism 82 for rotating a disk-shapedrecording medium 81, and ahead transport mechanism 83 for transporting themagnetic head recording medium 81, wherein thehead transport mechanism 83 is comprised of ahead slider 84 for supporting themagnetic head suspension 85 for allowing thehead slider 84 to make an elastic contact with the disk-shapedrecording medium 81, and asuspension arm 86 connected to thehead transport mechanism 83 for supporting thesuspension 85, as shown in FIG. 16. - When the disk-shaped
recording medium 81 rotates driven by thedrive mechanism 82, themagnetic head head slider 84 performs recording or reproducing of a signal to and from the disk-shapedrecording medium 81. - By performing the recording or reproducing of the signal to and from the disk-shaped
recording medium 81 by means of themagnetic head - Hereinabove, each exemplary preferred embodiments of the present invention have been described by way of example of the magnetic head which has the eight pieces of magnetic heads elements, however, it should be noted that the present invention is not limited thereto.
- Further, in the above description of the exemplary preferred embodiments, its tape drive system has been described by way of example of a so-called helical scan tape system using the rotary drum, however, the present invention is not limited thereto, and can be applied to a linear scan tape system as well.
- Furthermore, although the present invention has been described in its preferred form with a certain degree of particularity, many changes, variations, combinations and sub-combinations are possible herein. It is therefore to be understood that any modifications will be practiced otherwise than as specifically described herein without departing from the scope of the present invention.
Claims (19)
1. A magnetic recording head including a plurality of magnetic recording head layers laminated on a substrate made of a non-magnetic material, each of said plurality of magnetic recording head layers including magnetic recording head elements fabricated by a thin film process and interposed between two insulating layers, and all of said magnetic recording head elements being displaced from each other in a head width direction constituting an orthogonal direction relative to a direction of lamination, wherein
said plurality of magnetic recording head layers comprises a plurality of magnetic recording head elements formed at a predetermined pitch.
2. The magnetic recording head according to claim 1 , wherein any two magnetic recording head elements adjacent in the direction of lamination via an insulating layer share a common insulating layer.
3. A magnetic reproducing head including a plurality of magnetic reproducing head layers laminated on a substrate made of a non-magnetic material, each of said plurality of the magnetic reproducing head layers including magnetic reproducing head elements fabricated by a thin film process and interposed between two magnetic shielding layers, and all of said magnetic reproducing head elements being displaced from each other in a head width direction constituting an orthogonal direction relative to a direction of lamination, wherein
said plurality of magnetic reproducing head layers comprises a plurality of magnetic reproducing head elements formed at a predetermined pitch.
4. The magnetic reproducing head according to claim 3 , wherein any two magnetic reproducing head elements adjacent in the direction of lamination via a magnetic shielding layer share a common magnetic shielding layer.
5. The magnetic reproducing head according to claim 3 , wherein any two magnetic reproducing head elements adjacent in the direction of lamination via two magnetic shielding layers further includes an insulating layer interposed between said two magnetic shielding layers.
6. A magnetic head including a plurality of magnetic reproducing head layers each having magnetic reproducing head elements fabricated by a thin film process and interposed between two magnetic shielding layers and a plurality of magnetic recording head layers each having magnetic recording head elements fabricated by a thin film process and interposed between two insulating films, laminated on a substrate made of a non-magnetic material, and all of said magnetic reproducing head elements being displaced from each other in a head width direction constituting an orthogonal direction relative to a direction of lamination thereof, wherein
said magnetic reproducing head layers comprise a plurality of magnetic reproducing head elements formed at a predetermined pitch;
said magnetic recording head layers has a plurality of magnetic recording head elements formed at a same pitch as said plurality of magnetic reproducing head elements; and
each magnetic reproducing head element and each magnetic recording head element are formed approximately at a similar position in the head width direction, forming a pair.
7. The magnetic head according to claim 6 , wherein said magnetic reproducing head layers and said magnetic recording head layers are alternately laminated, and a magnetic reproducing head element and a magnetic recording head element forming a pair are adjacent in a direction of lamination via a magnetic shielding layer and an insulating layer.
8. The magnetic head according to claim 6 , further comprising:
a magnetic reproducing head layer group formed by laminating a plurality of magnetic reproducing head layers; and
a magnetic recording head layer group formed by laminating a plurality of magnetic recording head layers; wherein
said magnetic reproducing head layer group and said magnetic recording head layer group are laminated.
9. A tape drive having a magnetic recording head for recording a signal on a recording medium in tape form and a tape running means for running said recording medium in tape form along a predetermined run path, wherein
said magnetic recording head comprises a plurality of magnetic recording head layers laminated on a substrate made of a non-magnetic material, each of said plurality of magnetic recording head layers including magnetic recording head elements interposed between two insulating layers, all of said magnetic recording head elements formed therein being displaced from each other in a head width direction constituting an orthogonal direction relative to a direction of lamination thereof; and
said plurality of magnetic recording head layers comprises a plurality of magnetic recording head elements formed at a predetermined pitch.
10. The tape drive according to claim 9 , wherein any two magnetic recording head elements adjacent via an insulating layer in the direction of lamination share a common insulating layer.
11. A tape drive having a magnetic reproducing head for reproducing a signal from a recording medium in tape form and a tape running means for running the recording medium in tape form along a predetermined transport path, wherein
said magnetic reproducing head comprises a plurality of magnetic reproducing head layers laminated on a substrate made of a non-magnetic material, each of said plurality of magnetic reproducing head layers having magnetic reproducing head elements fabricated by a thin film process and interposed between two magnetic shielding layers, and all of the magnetic reproducing head elements formed therein being displaced from each other in a head width direction constituting an orthogonal direction relative to the direction of lamination thereof; and
said magnetic reproducing head layers comprise a plurality of magnetic reproducing head elements formed at a predetermined pitch.
12. The tape drive according to claim 11 , wherein any two magnetic reproducing head elements adjacent via magnetic shielding layers in the direction of lamination share a common magnetic shielding layer.
13. The tape drive according to claim 11 , further comprising an insulating layer provided between two magnetic shielding layers interposed between the two magnetic reproducing head elements which are adjacent via magnetic shielding layers in the direction of lamination.
14. A tape drive provided with a magnetic head for recording and reproducing a signal to and from a recording medium in tape form, and a tape running means for running the recording medium in tape form along a predetermined running path, wherein
said magnetic head comprises a plurality of magnetic reproducing head layers each having magnetic reproducing head elements fabricated by a thin film process and interposed between two magnetic shielding layers, and a plurality of magnetic recording head layers each having magnetic recording head elements fabricated by a thin film process and interposed between two insulating layers, laminated on a substrate made of a non-magnetic material, all of the magnetic reproducing head elements therein being displaced from each other in a head width direction constituting an orthogonal direction relative to the direction of lamination, and all of the magnetic recording head elements therein being displaced from each other in the head width direction;
each magnetic reproducing head layer includes a plurality of magnetic reproducing head elements formed at a predetermined pitch;
each magnetic recording head layer includes a plurality of magnetic recording head elements formed at a similar pitch as that of the plurality of the magnetic reproducing head elements; and
each magnetic reproducing head element and each magnetic recording head element are formed approximately at a similar position in the head width direction, forming a pair.
15. The tape drive according to claim 14 , wherein
said magnetic reproducing head layers and said magnetic recording head layers are alternately laminated; and
said magnetic reproducing head element and said magnetic recording head element constituting the pair are adjacent in the direction of lamination via a magnetic shielding layer and an insulating layer.
16. The tape drive according to claim 14 , further comprising a magnetic reproducing head layer group formed by laminating a plurality of magnetic reproducing head layers, and a magnetic recording head layer group formed by laminating a plurality of magnetic recording head layers, wherein said magnetic reproducing head layer group and said magnetic recording head layer group are laminated.
17. A disk drive provided with a magnetic head for recording and reproducing a signal to and from a disk-shaped recording medium, and a drive mechanism for rotating said disk-shaped recording medium, wherein
said magnetic head comprises: a plurality of magnetic reproducing head layers each including magnetic reproducing head elements fabricated by a thin film process and interposed between two magnetic shielding layers; and a plurality of magnetic recording head layers each including magnetic recording head elements fabricated by a thin film process and interposed between two insulating layers, both being laminated on a substrate made of a non-magnetic material, all of the magnetic reproducing head elements formed therein being displaced from each other in a head width direction constituting an orthogonal direction relative to a direction of lamination, and all of the magnetic recording head elements formed therein being displaced from each other in the head width direction;
each magnetic reproducing head layer comprises a plurality of magnetic reproducing head elements formed at a predetermined pitch;
each magnetic recording head layer comprises a plurality of magnetic recording head elements formed at a similar pitch as that of said plurality of magnetic reproducing head elements; and
each magnetic reproducing head element and each magnetic recording head element are formed approximately at a similar position in the head width direction, forming a pair.
18. The disk drive according to claim 17 , wherein said magnetic reproducing head layers and said magnetic recording head layers are alternately laminated, and a magnetic reproducing head element and a magnetic recording head element in a pair are adjacent via a magnetic shielding layer and an insulating layer in the direction of lamination.
19. The disk drive according to claim 17 , further comprising a magnetic reproducing head layer group formed by laminating a plurality of magnetic reproducing head layers, and a magnetic recording head layer group formed by laminating a plurality of magnetic recording head layers, wherein said magnetic reproducing head layer group and said magnetic recording head layer group are laminated.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US11/103,211 US20050174689A1 (en) | 2002-05-15 | 2005-04-11 | Magnetic recording head, magnetic reproducing head, magnetic head, tape drive and disk drive |
US11/103,210 US20050174688A1 (en) | 2002-05-15 | 2005-04-11 | Magnetic recording head, magnetic reproducing head, magnetic head, tape drive and disk drive |
US11/653,806 US7324303B2 (en) | 2002-05-15 | 2007-01-16 | Magnetic recording/reproducing head with head elements displaced in both head width and lamination directions |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JPP2002-140556 | 2002-05-15 | ||
JP2002140556A JP2003338012A (en) | 2002-05-15 | 2002-05-15 | Magnetic recording head device, magnetic reproducing head device, magnetic head device, and tape drive and disk drive using the devices |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/103,210 Division US20050174688A1 (en) | 2002-05-15 | 2005-04-11 | Magnetic recording head, magnetic reproducing head, magnetic head, tape drive and disk drive |
US11/103,211 Division US20050174689A1 (en) | 2002-05-15 | 2005-04-11 | Magnetic recording head, magnetic reproducing head, magnetic head, tape drive and disk drive |
Publications (1)
Publication Number | Publication Date |
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US20040021982A1 true US20040021982A1 (en) | 2004-02-05 |
Family
ID=29701408
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US10/431,834 Abandoned US20040021982A1 (en) | 2002-05-15 | 2003-05-08 | Magnetic recording head, magnetic reproducing head, magnetic head, tape drive and disk drive |
US11/103,210 Abandoned US20050174688A1 (en) | 2002-05-15 | 2005-04-11 | Magnetic recording head, magnetic reproducing head, magnetic head, tape drive and disk drive |
US11/103,211 Abandoned US20050174689A1 (en) | 2002-05-15 | 2005-04-11 | Magnetic recording head, magnetic reproducing head, magnetic head, tape drive and disk drive |
US11/653,806 Expired - Fee Related US7324303B2 (en) | 2002-05-15 | 2007-01-16 | Magnetic recording/reproducing head with head elements displaced in both head width and lamination directions |
Family Applications After (3)
Application Number | Title | Priority Date | Filing Date |
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US11/103,210 Abandoned US20050174688A1 (en) | 2002-05-15 | 2005-04-11 | Magnetic recording head, magnetic reproducing head, magnetic head, tape drive and disk drive |
US11/103,211 Abandoned US20050174689A1 (en) | 2002-05-15 | 2005-04-11 | Magnetic recording head, magnetic reproducing head, magnetic head, tape drive and disk drive |
US11/653,806 Expired - Fee Related US7324303B2 (en) | 2002-05-15 | 2007-01-16 | Magnetic recording/reproducing head with head elements displaced in both head width and lamination directions |
Country Status (2)
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US (4) | US20040021982A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
US20050174689A1 (en) | 2005-08-11 |
US7324303B2 (en) | 2008-01-29 |
US20050174688A1 (en) | 2005-08-11 |
US20070109682A1 (en) | 2007-05-17 |
JP2003338012A (en) | 2003-11-28 |
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