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1. 发明专利

JPH07235009A MAGNETIC HEAD AND MAGNETIC DISK DEVICE USING THE SAME 失效
公开(公告)号：JPH07235009A
公开(公告)日：1995-09-05
申请号：JP2647894
申请日：1994-02-24
申请人： HITACHI LTD , HITACHI METALS LTD
发明人： OTOMO MOICHI , KIRINO FUMIYOSHI , MORIWAKI HIDETOSHI , KAWAI TETSUO , KUDO SANEHIRO
IPC分类号： G11B5/11 , G11B5/02 , G11B5/127
摘要： PURPOSE:To drastically decrease noises due to magnetorestriction vibrations of ferrite by adhering a nonmagnetic metallic material to at least a part of the side faces of ferrite cores. CONSTITUTION:A metal-in-gap type head chip obtd. by forming an FeAlSi alloy film of a thickness 2mum on the gap surfaces of the cores consisting of an MnZn ferrite single crystal is used as a head chip 10. This head chip 10 is first fixed to a slider with a joining material consisting of glass near the surface for facing media and is further wound with windings 14. Next, an epoxy resin is applied over the entire part of the head chip in the state of not adhere a reinforcing material 18 of the rear part core and is cured to form an insulating layer 13. A Cu film is formed thereon by an electroless plating method to form a nonmagnetic metallic material 12. An org. material, such as resist material soluble in an org. solvent, is applied on the part where the nonmagnetic material is not formed and the resist material is dissolved by the org. solvent after the formation of the Cu film to prevent adhesion. The film thickness of the nonmagnetic metallic material is specified to be 30mum.

2. 发明专利

JPH07235008A MAGNETIC HEAD AND MAGNETIC DISK DEVICE USING THE SAME 失效
公开(公告)号：JPH07235008A
公开(公告)日：1995-09-05
申请号：JP2647794
申请日：1994-02-24
申请人： HITACHI LTD , HITACHI METALS LTD
发明人： OTOMO MOICHI , KIRINO FUMIYOSHI , MORIWAKI HIDETOSHI , KAWAI TETSUO , KUDO SANEHIRO
IPC分类号： G11B5/49 , G11B5/127 , G11B5/60
摘要： PURPOSE:To drastically decrease noises due to magnetorestriction vibrations of ferrite by adhering a resin to at least a part of the side faces of ferrite core. CONSTITUTION:A metal-in-gap type head chip obtd. by forming an FeAlSi alloy film of a thickness 2mum on the gap surfaces of the cores consisting of an MnZn ferrite single crystal is used as a head chip 10. The head chip 10 is first fixed to a slider with a joining material consisting of glass near the surface for facing the media and is further wound with windings 14. Next, an epoxy resin is filled into a groove 13 for winding 13 in such a manner that the groove is embedded in the entire part of the head chip in the state of not adhere a reinforcing material 18 of the rear part core. Then the epoxy resin is cured to form the resin 12. A conductive resin may be used in place of the epoxy resin as the resin 12. In such a case, an SiO2 insulating layer formed by applying a coating type SiO2 and drying the coating may be used as the nonmagnetic insulatability layer between the ferrite cores.

3. 发明专利

JPH11120522A MR COMBINED THIN-FILM MAGNETIC HEAD 失效
公开(公告)号：JPH11120522A
公开(公告)日：1999-04-30
申请号：JP28521697
申请日：1997-10-17
申请人： HITACHI METALS LTD
发明人： OTOMO MOICHI , SUDO SHUJI , YOSHIMURA KUNIAKI , TAKAHASHI HIDEJI , UEDA YUJI
IPC分类号： G11B5/39
摘要： PROBLEM TO BE SOLVED: To obtain an MR combined thin-film magnetic head having excellent O/W and NLTS characteristics at high recording density high frequencies. SOLUTION: The upper magnetic pole of the MR combined thin-film magnetic head comprises at least >=2 layers of magnetic films. A high BS plating film of 1.2 to 2.4T in saturation magnetic flux density is used for the layer near a gap face high specific resistance sputter films having 80 to 1500 μΩcm in specific resistance are used for the lower magnetic pole 11 and central part magnetic mole 13, by which the characteristics of overwriting and nonlinear magnetization transition point shift are improved.

4. 发明专利

JPH10134315A FLOATING MAGNETIC HEAD AND ITS MANUFACTURE 失效
公开(公告)号：JPH10134315A
公开(公告)日：1998-05-22
申请号：JP28275596
申请日：1996-10-24
申请人： HITACHI METALS LTD
发明人： OTOMO MOICHI , GOTO MAKOTO , SUGIMOTO MASAKAZU , SUWABE SHIGEKAZU , NITANDA FUMIO , KONDO KEIICHI
IPC分类号： G11B5/127 , G11B5/187
摘要： PROBLEM TO BE SOLVED: To provide a high density recording head by replacing the material of one side magnetic core half body in the vicinity of a floating surface with a non-magnetic material and providing a processing groove deciding a track width in the vicinity of the floating surface obliquely for the floating surface so as to become deep in the changed side magnetic core half body side. SOLUTION: A ferrite in the vicinity 17 of the floating surface of the magnetic core half body 10 of a magnetic core is removed and replaced with the non-magnetic material. Together with that, the processing groove 18 for deciding the track width is provided in the vicinity of the floating surface obliquely to the floating surface so as to be deeper in the replaced side magnetic core half body 10 side. Thus, the magnetic body value of the magnetic core half body 11 side is increased, and recording efficiency is enhanced. For instance, the angle between the processing groove 18 and the floating surface is regulated to 23 deg., and the depth (depth of step) Sd of the processing groove 18 measured from a gap depth position along a gap surface is regulated to 8μm. In such a manner, by providing the processing groove obliquely to the floating surface, a nonlinear magnetization transition point shift NLTS is reduced.

5. 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.

6. 发明专利

JPH11175914A COMPOSITE MAGNETIC HEAD AND ITS MANUFACTURE 失效
公开(公告)号：JPH11175914A
公开(公告)日：1999-07-02
申请号：JP34152897
申请日：1997-12-11
申请人： HITACHI METALS LTD
发明人： SUDO SHUJI , OTOMO MOICHI , TAKAHASHI HIDEJI
IPC分类号： G11B5/31
摘要： PROBLEM TO BE SOLVED: To provide a narrow recording track width having a high overwrite characteristic by laminating plating substrate films and plating magnetic films to constitute of a top section magnetic core and providing the magnetic restuck layer, which at least includes the composition of a plating substrate, to the side surface of the tip section having a recording gap at a lower percentage against a track width. SOLUTION: The top section magnetic core has the angle section which is larger than the one caused by a frame plating process. The saturated magnetic flux density of the plating substrate films is higher than the plating magnetic films. Moreover, it is desirable to select either one of the plating substrate or the plating magnetic films of the material for an etching. The plating substrate films are constituted of more than two layers and at least one of the layers or the plating magnetic film is made into the material which is selectively etched. It is desirable to use an NiFe alloy for the plating substrate film. It is also desirable to make the plating magnetic films with two layers of CoTaZr alloy and NiFe alloy or CoTaZr and NiFe alloys.

7. 发明专利

JPH1196517A MR COMPOSITE THIN-FILM MAGNETIC HEAD 失效
公开(公告)号：JPH1196517A
公开(公告)日：1999-04-09
申请号：JP25720597
申请日：1997-09-22
申请人： HITACHI METALS LTD
发明人： OTOMO MOICHI , SUDO SHUJI , UEDA YUJI , YOSHIMURA KUNIAKI , TAKAHASHI HIDEJI
IPC分类号： G11B5/39
摘要： PROBLEM TO BE SOLVED: To obtain a magnetic head which enables a high density and high-frequency recording by constituting an upper part magnetic pole with >=2 planes or curved surfaces near a floating surface and constituting these surfaces in such a manner that the angle formed by the tangent on the floating surface side of the surfaces with a gap surface is made smaller than the angles of the other surfaces nearest the floating surface, thereby using a saturation magnetic flux density of a specific value for the upper part magnetic pole. SOLUTION: A high Bs plating film of 1.2T to 2.4T in the saturation magnetic flux density is used for the upper part magnetic pole. A high specific resistance sputter film of, for example, a CoTaZr based amorphous alloy or a high specific resistance sputter film similar to the lower part magnetic pole 11 is used for a middle part magnetic pole 13. The gap surface side of the upper part magnetic pole 18 is composed of the plural curved surfaces near the floating surface 20. The angle 61 formed by the tangent on the floating surface side of the curved surface 22 nearest the floating surface and the gap surface is made smaller than the angles θ2 and θ2' formed by the tangent on the floating surface side of the curved surfaces 23 and 23' further than the floating surface and the gap surface. As a result, the overwriting characteristics at the high recording density frequency are improved.

8. 发明专利

JP2001176031A THIN-FILM MAGNETIC HEAD 失效
公开(公告)号：JP2001176031A
公开(公告)日：2001-06-29
申请号：JP35790999
申请日：1999-12-16
申请人： HITACHI METALS LTD
发明人： FUKUI HIROSHI , OTOMO MOICHI
IPC分类号： G11B5/31 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To provide a thin-film magnetic head in which the disturbance of the magnetic domain of a reproducing element caused by the magnetic field of a recording head is suppressed and a noise of reproducing output is reduced. SOLUTION: This thin-film magnetic head is provided with an MR head having a reproducing element between lower and upper shields, and a recording head having a thin-film coil disposed around the joined part of upper and lower magnetic poles forming a magnetic circuit. The MR head and the recording head are separated from each other, and the length LUS of the upper shield with respect to a distance LBP from a surface facing a medium up to the back gap of the lower magnetic pole is set in the relation of LUS

9. 发明专利

JP2000182226A MR HEAD 失效
公开(公告)号：JP2000182226A
公开(公告)日：2000-06-30
申请号：JP35720498
申请日：1998-12-16
申请人： HITACHI METALS LTD
发明人： SUDO SHUJI , MOCHIZUKI MASABUMI , SHIMOE OSAMU , MITSUMATA CHIHARU , OTOMO MOICHI , FUKAMACHI KEISUKE
IPC分类号： G11B5/31 , G11B5/39
摘要： PROBLEM TO BE SOLVED: To realize the high frequency characteristic and heat dissipation property of an intermediate shield material by constituting the intermediate shield layer of a multilayer film having the magnetic film of two and above layers, making the magnetic film of an upper magnet pole side in the multilayer to be a high specific resistance film and making the magnetic film of a lower shield side to be a high heat conduction film. SOLUTION: In this MR head, an intermediate shield is composed of the magnetic film of two layers, a reproduction gap side is composed of a metallic magnetic film 7 whose specific resistance is not more than 25 μΩ and an upper magnetic pole side of a magnetic film 6 whose specific resistance is not less than 80 μΩ. It is desirable that the magnetic film on the upper magnetic pole side in the intermediate shield functions as a lower magnetic pole and the reproduction gap side of the intermediate shield as a shield. The intermediate shield is composed of at least the two layer film and the reproduction gap side is composed of the metallic magnetic film of low specific resistance. Thus, heat dissipation property is good. On the other hand, the upper magnetic pole side is formed of a high specific resistance magnetic film and therefore recording performance at the time of high frequency is also good.

10. 发明专利

JP2004334995A Thin film magnetic head 审中-公开
标题翻译：薄膜磁头
公开(公告)号：JP2004334995A
公开(公告)日：2004-11-25
申请号：JP2003130983
申请日：2003-05-09
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： OTOMO MOICHI , FUKUI HIROSHI , YONEKAWA SUNAO , MARUYAMA YOJI , IWAKURA TADAYUKI
IPC分类号： G11B5/39
CPC分类号： G11B5/3916
摘要： PROBLEM TO BE SOLVED: To provide a thin film magnetic head having small thermal protrusion with respect to the rise of the environmental temperature.
SOLUTION: A magnetic material having a low thermal expansion coefficient that is equal to or less than 11.5×10
-6 /K is used for at least one of a bottom section shield or a top section shield. Moreover, a laminated layer film made of a magnetic material having a low thermal expansion coefficient that is equal to or less than 11.5×10
-6 /K and an 80 wt% NiFe alloy is used for at least the bottom section shield or the top section shield. Thus, a thin film magnetic head, in which noise is made low after recording and thermal protrusion is reduced, is obtained.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供相对于环境温度的升高具有小的热突起的薄膜磁头。解决方案：低热膨胀系数等于或小于11.5×10 -6 / SP / K的磁性材料用于底部屏蔽或顶部部分中的至少一个屏蔽。此外，至少使用由低热膨胀系数等于或小于11.5×10 -6 SPF / K和80重量％NiFe合金的磁性材料制成的叠层膜底部屏蔽或顶部屏蔽。因此，获得了在记录和热突起之后使噪音降低的薄膜磁头。版权所有（C）2005，JPO＆NCIPI

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