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21. 发明专利

JP2001023125A COMBINATION MAGNETIC HEAD AND MAGNETIC RECORDING/ REPRODUCING DEVICE 失效
公开(公告)号：JP2001023125A
公开(公告)日：2001-01-26
申请号：JP18836899
申请日：1999-07-02
申请人： HITACHI LTD
发明人： TSUCHIYA TOSHIO , OBATA AKIHISA , INADA KENKICHI , MASUDA NORIAKI , TAKEDA HIDEKAZU , MARUYAMA HIDENORI
IPC分类号： G11B5/39 , G11B5/127 , G11B5/265
摘要： PROBLEM TO BE SOLVED: To obtain a magnetic head and a recording/reproducing device which can avoid the deterioration of the signal S/N which is caused by adjacent crosstalk even if widths of tracks are reduced. SOLUTION: A main signal is read by a 1st magnetic head device 1 which has a track width narrower than the track pitch of a medium on which signals are recorded. A tracking servo signal is read by a 2nd magnetic head device 2 which has a track width wider than the track pitch. The 1st magnetic head device 1 and the 2nd magnetic head device 2 are integrally formed with each other into predetermined arrangement to compose a combination magnetic head.

22. 发明专利

JP2000285402A RECORDING CHECKING METHOD 失效
公开(公告)号：JP2000285402A
公开(公告)日：2000-10-13
申请号：JP8872399
申请日：1999-03-30
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： HIGASHIOJI MASARU , BABA KOHEI , YODA HIROSHI , UMEE KAZUNORI
IPC分类号： G11B5/09 , G11B5/008 , G11B5/265 , G11B27/36
摘要： PROBLEM TO BE SOLVED: To efficiently detect, with the smaller number of heads, an error in a recording process of a magnetic recording and reproducing apparatus such as a VTR or the like. SOLUTION: In this recording checking method, a main track section 4 is erased by erasure heads E1, E2 and auxiliary information is recorded in an auxiliary track section 3. A main signal is recorded in the main track section 4 by recording heads R1, R2 (R1 is not illustrated) and the auxiliary information is reproduced from the auxiliary track section 3. The recording operation is checked and verified through the condition of the reproduced auxiliary information and a recording current that flows across the recording heads when the main information is being recorded.

23. 发明专利

JP2000020911A MAGNETIC HEAD 失效
公开(公告)号：JP2000020911A
公开(公告)日：2000-01-21
申请号：JP18358398
申请日：1998-06-30
申请人： MINEBEA CO LTD
发明人： ADACHI SHIGEYUKI , TAKAYANAGI KAZUTOSHI , EGAWA MOTOJI , KAWASHIMA SATOYUKI
IPC分类号： G11B5/265
摘要： PROBLEM TO BE SOLVED: To provide a magnetic head capable of improving manufacturing yield, while maintaining a satisfactory recording and reproducing characteristics. SOLUTION: Since the magnetic film of a material (for example, an Fe-Al-Si alloy) having a high saturation magnetic density is provided at the surface part of the side of an intermediate core 13 in a counter surface part in which the gap for recording and reproduction 14 of a first core body 3 is formed, a satisfactory recording and reproducing characteristic can be obtained in this magnetic head. As a result, even when it is supposed that variations are generated in the gap depths of the gap 14 for recording and reproduction, desired recording and reproducing characteristics can be maintained over a wide range regarding the dimension of the gap depth. Then, since the desired recording and reproducing characteristics can be obtained in this manner, a tolerance range is broadened as to the variations in gap depths and, thus magnetic heads becoming usable increase in number and in turn the manufacturing yield is improved.

24. 发明专利

JPH11353622A RECORDING AND REPRODUCTION SEPARATION TYPE HEAD 失效
公开(公告)号：JPH11353622A
公开(公告)日：1999-12-24
申请号：JP15462198
申请日：1998-06-03
申请人： HITACHI METALS LTD
发明人： JINNAI KAORU , TAKAHASHI HIDEJI
IPC分类号： G11B5/31 , G11B5/265 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To enable the bending of recording signals by the influence of magnetic pole ends and to improve the steepness of reproducing waveforms by providing magnetic cores with magnetic gaps and forming the recording gaps so as to curve to a projecting shape. SOLUTION: A lower shield 1, a reproducing lower gap 2, a reproducing element 3 inclusive of an MR film, permanent magnet films 4 joined to the right and left across this reproducing element 3, a wiring film 5, a reproducing upper gap 6 and a lower magnetic pole 7 are formed by a thin film forming technique on a substrate provided with an insulating layer. The surface of the lower magnetic pole is subjected to a planatarization treatment. A resist pattern 10 is formed and a magnetic plating film 11 is formed by a plating method. The pattern width of the resist 10 and the liquid compsn., plating current density, etc., of a plating liquid are controlled, by which the curving of the plating surface to the projecting shape is made possible. The lower magnetic pole 7 and magnetic plating film 11 are magnetically integrated. The magnetic gap and the upper material pole are formed thereon, by which the magnetic gap curved to the projecting shape may be formed.

25. 发明专利

JPH11306513A HIGH-DENSITY RECORDING AND REPRODUCING HEAD AND HIGH TRACK DENSITY MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH11306513A
公开(公告)日：1999-11-05
申请号：JP10939498
申请日：1998-04-20
申请人： HITACHI LTD
发明人： MIYAMOTO NORIFUMI , ISHII SEI , KOYAMA NAOKI
IPC分类号： G11B5/31 , G11B5/265 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To make a curve of a magnetization transition region recorded on a medium small by using a high saturation flux density material for an upper magnetic pole material, and selecting a higher saturation flux density than that of a lower magnetic pole. SOLUTION: An upper shield film 13 serves also as a lower magnetic pole of a recording head, and this lower magnetic pole 13 is projecting in the direction of the upper magnetic pole, and the upper width Wg2 of this projection decides a recording gap width. A recording gap 15 is formed on the lower magnetic pole 13, and the upper magnetic pole 14 is arranged thereon. For this upper magnetic pole material, a material with a higher saturation flux density than that of a lower magnetic pole is selected. A geometric width Wg1 of the upper magnetic pole 14 is made to be at least 1.5-2 times as long as the recording gap length on one side than the projection width Wg2 of the lower magnetic pole 13. In such a manner, information is recorded by using a recording magnetic field leaking to the medium counter face side from the recording gap 15 constituted by the upper magnetic pole 14 and the lower magnetic pole 13.

26. 发明专利

JPH11250426A COMPOSITE THIN FILM MAGNETIC HEAD AND ITS MANUFACTURE 失效
公开(公告)号：JPH11250426A
公开(公告)日：1999-09-17
申请号：JP4781098
申请日：1998-02-27
申请人： TDK CORP
发明人： SASAKI YOSHITAKA
IPC分类号： G11B5/265 , G11B5/31 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To obtain a composite thin film magnetic head capable of suppressing defective insulation on a conductive layer even when a shield layer for an MR element is thinned to solve a thermal asperity problem and obtaining a high magnetic shield effect. SOLUTION: A 1st magnetic shield layer 33 is formed on the whole surface of a substrate insulating layer 32, a thick 2nd magnetic shield layer 34 is selectively formed on a part corresponding to an MR element to constitute a difference in level, a 1st insulating layer 35 crossing the level difference is formed, and a GMR magnetoresistance layer 37 embedded in shield gap layers 36, 40 is formed on the surface of the layer 35. After forming a 3rd magnetic layer 41 crossing the level difference, a 1st layer of thin film coils 43 is formed on the lower side part of the level difference and a 2nd layer of thin film coils 45 is formed on the upper part of the coils 43. Then a 4th magnetic layer 47 is formed through a write gap layer 46 to complete a composite thin film magnetic head.

27. 发明专利

JPH11250424A MAGNETIC HEAD 失效
公开(公告)号：JPH11250424A
公开(公告)日：1999-09-17
申请号：JP4696598
申请日：1998-02-27
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： IRIE YASUSUKE , YOKOYAMA KAZUO , KUSUMOTO OSAMU , FUKAZAWA TOSHIO , TSUJI HIROYASU
IPC分类号： G11B5/31 , G11B5/265 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To provide a magnetic head having a single gap capable of recording and reproducing information by using a ferromagnetic material having high magnetic permeability not at a low magnetic field but at a high magnetic field for a part of a ring magnetic core and making a magnetic flux passing route for recording different from that for reproducing, controlling the width of a track by the film thickness of a magnetic core by allowing the film thickness direction of the magnetic core to correspond to the track width and narrowing the track width. SOLUTION: The ring magnetic core 11 is formed on a substrate 10, a magnetic gap 12 is formed vertically to the film surface of the core 11 forming a ring and the gap 12 shares with a recording/reproducing gap. The core 11 for inducing a magnetic field induced from a medium 15 to a magnetoresistive effect (MR) element 13 is constituted of a ferromagnetic substance having high magnetic permeability at a low magnetic field and a part of the coil side magnetic core 11 which is formed by recording information in the medium 15 is constituted of a ferromagnetic substance having high magnetic permeability at a high magnetic field. The magnetic core 11 constituting a magnetic circuit at the time of recording and reproducing is laminated in the vicinity of the magnetic gap 12.

28. 发明专利

JPH11213335A THIN FILM MAGNETIC HEAD AND MAGNETIC STORAGE DEVICE 失效
公开(公告)号：JPH11213335A
公开(公告)日：1999-08-06
申请号：JP1014098
申请日：1998-01-22
申请人： HITACHI LTD
发明人： KOYANAGI HIROAKI , KANAYAMA KOJI , IMANAKA RITSU , TAKAGI MASAYUKI
IPC分类号： G11B5/31 , G11B5/265
摘要： PROBLEM TO BE SOLVED: To make reducible the thickness of the gap film having a superior electrical insulating characteristic, a strong chemical resistance and a good thermal conductivity and to enable a high density recording to be performed by constituting one or both of a reproducing head gap film and a recording head gap film with the laminating body of a diamond-like carbon film and a dielectric. SOLUTION: On a base alumina 1 located on a ceramics substrate, a reproducing head bottom section shield film 2, bottom and top section reproducing head gap films 3 and 5 interposing magnetoresistive effect films 4, are formed in that order. Then, on the top of them, a top section shield film 6, which acts as a top shield and the bottom section magnetic film of a recording head, a recording head gap film 7, a coil 8, an interlayer insulation film 9, a top section magnetic film 10 and a protection alumina 11 are formed in that order. The films 3, 5 and 7 are formed using the material in which 0.002 to 0.01 μm diamond-like carbon film is formed between 0.009 to 0.07 μm two layer alumina films. Thus, the thin film magnetic head, which is highly suitable for a high density recording, is obtained.

29. 发明专利

JPH11203635A MAGNETO-RESISTIVE COMBINED HEAD 失效
公开(公告)号：JPH11203635A
公开(公告)日：1999-07-30
申请号：JP2153198
申请日：1998-01-19
申请人： VICTOR COMPANY OF JAPAN
发明人： OURA HIDEO
IPC分类号： G11B5/39 , G11B5/265
摘要： PROBLEM TO BE SOLVED: To prevent the deterioration of the recording efficiency in a high frequency band higher than 100 MHz. SOLUTION: When the sectional plane of a coil is divided by a dividing groove, the increase of a recording current in the band higher than 100 MHz of recording frequency is suppressed as shown in the curves B-F, and the recording efficiency is prevented from deteriorating. When the depth (t) of the dividing groove 52 is made not less than 50% of the height (h) of the coil, the more effective result is obtained as shown in the curves C-E. When the divided width W1 -W2 is changed from 2 μm to 2.5 μm, the recording current is rather increased as shown in the curve F, therefore, the dimension of not more than 2 μm is suitable for the divided width.

30. 发明专利

JPH11195206A MAGNETORESISTIVE THIN FILM MAGNETIC HEAD AND PRODUCTION THEREOF 失效
公开(公告)号：JPH11195206A
公开(公告)日：1999-07-21
申请号：JP36011897
申请日：1997-12-26
申请人： HITACHI METALS LTD
发明人： OTOMO MOICHI , YOSHIMURA KUNIAKI , TAKAHASHI HIDEJI
IPC分类号： G11B5/31 , G11B5/265 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To obtain a magnetoresistive combined head capable of performing a high desity and a high frequency recording by using a soft magnetic film having a highly saturated magnetic density on the front part magnetic pole of an upper part and using a soft magnetic film having a high resistivity on the rear part magnetic pole of the upper and a middle part magnetic pole. SOLUTION: Upper part magnetic poles of a thin film combined head are formed by joining the front part magnetic pole of an upper part 22 and the rear part magnetic pole of an upper part 21. At this time, at least the hickness of one side of the poles is gradually reduced in order to reduce leaches of magnetic fluxes of the joining area. Moreover, a soft magnetic plated film which is an Ni-Fe alloy, etc., and whose saturated magnetic flux density Bs is 1.4 to 2.2 T is formed on the front part magnetic pole 22 whose top end part is opposed to a recording gap and the rear part magnetic pole 21 is magnetically connected to the middle part magnetic pole 13 having a high resistivity ρ at its rear part and a soft magnetic sputtered film having the high ρ of not smaller than 80 μΩcm is formed on the pole 21. Thus, the overwriting characteristic of the head by a magnetic saturation is improved by providing the plated film having the high Bs on the front part magnetic pole 22 stipulating a recording with and also the high frequency characteristic of the head is improved by forming the film having the high ρ on the rear part magnetic pole 21.

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