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1. 发明专利

JPH10222833A MAGNETIC HEAD 失效
公开(公告)号：JPH10222833A
公开(公告)日：1998-08-21
申请号：JP2137897
申请日：1997-02-04
申请人： HITACHI METALS LTD
发明人： SUGIYAMA TAKASHI , SUZUKI MASARU , NITANDA FUMIO , TOMITANI TADASHI
IPC分类号： G11B5/60 , G11B21/21
摘要： PROBLEM TO BE SOLVED: To provide a magnetic head generating sufficient negative pressure without causing a crash caused by stuck dust since the dust doesn't stick to its negative pressure groove related to a negative pressure system magnetic head used for a magnetic disk, etc. SOLUTION: An angle θ between a wall surface 3d' cohering the negative pressure groove bottom surface 3c of the negative pressure system magnetic head with a positive pressure generation surface 3b and the negative pressure groove bottom surface 3c is processed smaller than 30 deg.. Since for generating sufficient negative pressure, since the necessity that the angle of the wall surface 3d' is made 10 deg. or above exists, the angle θ is processed so as to become within the range of 10 deg.-30 deg., or the wall surface constituted of plural surfaces so as to become a small cross angle in a part being in contact with the bottom surface 3c of the wall surface 3d', and become a large cross angle in the part being in contact with the positive pressure generation surface 3b is given.

2. 发明专利

JPH07334813A MAGNETIC HEAD 失效
公开(公告)号：JPH07334813A
公开(公告)日：1995-12-22
申请号：JP12150994
申请日：1994-06-02
申请人： HITACHI METALS LTD
发明人： TEJIMA HIROYUKI , KAWAI TETSUO , KAGAWA MASATO , SAKAGUCHI ISAO , GOTO MAKOTO , TOMITANI TADASHI
IPC分类号： C22C45/04 , G11B5/127 , G11B5/23 , H01F10/16
摘要： PURPOSE:To improve the overwriting by laminating magnetic metallic films having different magnetic flux densities in two layers and specifying the saturation magnetic flux densities of the magnetic metallic films constituting the respective magnetic metallic film layers to have a suitable relation. CONSTITUTION:This magnetic head is constituted by laminating the magnetic metallic films having the different magnetic flux densities Bs in two layers. The saturation magnetic flux density Bs of the magnetic metallic films constituting the respective magnetic metallic film layers is lower in the magnetic metallic film 1b in contact with a magnetic gap than in the magnetic metallic film 1a in contact with the magnetic core on the leading side which is the progressing direction of the magnetic head. The Bs is lower in the magnetic metallic film 2a in contact with the magnetic core than in the magnetic metallic film 2b in contact with the magnetic gap on the trailing side existing in a position facing the leading side. Further, the Bs is higher in the magnetic film 2b in contact with the magnetic gap on the trailing side than in the magnetic film 1b in contact with the magnetic gap on the leading side.

3. 发明专利

JPS63293710A MAGNETIC HEAD 失效
公开(公告)号：JPS63293710A
公开(公告)日：1988-11-30
申请号：JP13093187
申请日：1987-05-27
申请人： HITACHI METALS LTD , TAKAHASHI KEN
发明人： TAKAHASHI KEN , GOTO MAKOTO , TOMITANI TADASHI
IPC分类号： G11B5/31 , G11B5/127 , G11B5/23
摘要： PURPOSE:To obtain a high magnetic permeability even if a film thickness is small by positioning the easy magnetization direction of a magnetic Fe-Al-Si film to the direction nearly perpendicular to the direction of a main magnetic path. CONSTITUTION:The easy magnetization direction of the magnetic Fe-Al-Si film of a magnetic head 1 having a magnetic core formed by vapor deposition of the magnetic Fe-Al-Si film on the surface of a substrate 10 is positioned at the direction nearly perpendicular to the direction of the main magnetic path. The magnetic Fe-Al-Si film is preferably composed, by weight %, of 2-10% Al, 3-16% Si, and the balance substantially Fe and is more preferably composed of 4-85% Al, 6-11% Si, and the balance substantially Fe. The magnetic Fe-Al-Si film is formed on the surface of the substrate 10 by a vapor deposition method such as sputtering in such a manner that uniaxial anisotropy is imparted thereto. The magnetic head having the thin Fe-Al-Si alloy film which possesses the high magnetic permeability even if the film thickness is small is thereby obtd.

4. 发明专利

JP2000339637A PRODUCTION OF MAGNETORESISTANCE EFFECT HEAD/GIANT MAGNETORESISTANCE EFFECT HEAD 失效
公开(公告)号：JP2000339637A
公开(公告)日：2000-12-08
申请号：JP15321399
申请日：1999-06-01
申请人： HITACHI METALS LTD
发明人： MEGURO SATOSHI , IFUKU TOSHIHIRO , MIMA HIROYUKI , FUJII SHIGEO , MUTO KENJI , TAKAHASHI HIDEJI , TOMITANI TADASHI
IPC分类号： G11B5/39
摘要： PROBLEM TO BE SOLVED: To increase the breakdown voltage of a gap layer and to improve the yield against breakdown by forming a metal protective film on a second gap layer and removing an oxide layer on the surface of a thin film lead. SOLUTION: A seed second film is formed all over the surface by sputtering. Before sputtering, an oxide layer 24 on a lead second layer 22 is removed by ion milling, and then a resist is formed thereon except for an intermediate shield part and a part to form a conductor. Then an intermediate shield layer 65 and a conductor 66 are grown on the seed film, the resist is removed, and the seed film in an area except for the intermediate shield and the conductor part is removed by ion milling to complete the process to form the intermediate shield. Then the surface is sputtered and flattened by chemical mechanical polishing, and an inductive head is formed thereon. Thus, the ion milling process to remove the oxide layer on the lead second layer is performed after a seed first film is formed.

5. 发明专利

JPH05342535A 失效
公开(公告)号：JPH05342535A
公开(公告)日：1993-12-24
申请号：JP15037792
申请日：1992-06-10
申请人： HITACHI LTD , HITACHI METALS LTD
发明人： OGURA YUKIKO , SAITO MASAKATSU , ABE MITSUO , TOMITANI TADASHI
IPC分类号： G11B5/31 , G11B5/39
摘要： PURPOSE:To efficiently read a magnetic field generated from a medium and to enhance reproduction efficiency. CONSTITUTION:An MR element 1 with leading-out conductors 3, 3' joined to both ends is interposed between magnetic shielding bodies 4, 4' with a nonmagnetic insulating layer 2. The MR element 1 is inclined in the almost same direction as the inclination direction of a signal magnetic field generated from a recording medium. By this inclination of the MR element, a magnetic field received by an MR head can be increased and reproduction efficiency can be enhanced.

6. 发明专利

JPH0227514A FLOATING TYPE COMPOSITE MAGNETIC HEAD 失效
公开(公告)号：JPH0227514A
公开(公告)日：1990-01-30
申请号：JP17508388
申请日：1988-07-15
申请人： HITACHI METALS LTD
发明人： NITANDA FUMIO , GOTO MAKOTO , YAMAZAKI MASANOBU , TOMITANI TADASHI , TOYODA MANABU
IPC分类号： C03C29/00 , C03C8/24 , G11B5/60
摘要： PURPOSE:To prevent the occurrence of stain, discoloration or deposition on the surface of a secondary glass opposed to a medium by forming a layer enriched with the component of the secondary glass which is excellent in weather resistance on the surface of the secondary glass opposed to the medium. CONSTITUTION:The surface opposed to the medium of the secondary glass (glass for burying) 4c of a magnetic head assembled by inserting a core 2 into the groove 3 of a slider 1 and performing secondary bonding by means of the secondary glass 4c is irradiated with ions, especially the ions of inactive gas such as Ar or the mixed gas of said inactive gas and reactive gas such as O2. Then, the more elements of lead having high sputtering rate of the components of the glass are driven out from the surface and the layer enriched with the elements having low sputtering rate such as SiO2 is formed on the surface of the secondary glass 4c which is exposed on the surface opposed to the medium. Thus, the stain and the discoloration of the surface of the secondary glass 4c can be prevented from occurring.

7. 发明专利

JPH01106302A COMPOSITE TYPE MAGNETIC HEAD 失效
公开(公告)号：JPH01106302A
公开(公告)日：1989-04-24
申请号：JP26263887
申请日：1987-10-20
申请人： HITACHI METALS LTD
发明人： GOTO MAKOTO , YAMAZAKI MASANOBU , TOMITANI TADASHI , AO MASAHIRO , TAKADA YOSHIAKI , USHIJIMA MAKOTO , KONDO YOSHIO
IPC分类号： G11B5/60 , G11B5/127
摘要： PURPOSE:To strengthen the sticking force of a magnetic thin film and to facilitate a control by providing a track width forming part to have a thin film forming surface parallel to a gap part and a thin film forming surface not parallel to the gap part to interlock to this at the facing surface of the C core and I core of a magnetic head chip. CONSTITUTION:A C core 2a having a winding groove 2c while it is composed of an Mn-Zn ferrite and an I core 2b without a winding groove are provided. At respective facing surfaces, the surface parallel to a gap part G and the surface not parallel to the gap part G to interlock to this are formed. Next, a magnetic thin film 5 of a 'Sendust(R)' is formed on the parallel surface and the non-parallel surface of the I core 2b and the parallel film surface to regulate a track width Tw and a non-parallel film surface 6 to interlock to this are formed. For the I core 2b, a reinforced glass 4b is most welded at the part of an outside corner angle 4d. When a length B of the non-welded part of the reinforced glass 4b is

8. 发明专利

JPH01103931A BONDING GLASS FOR MAGNETIC HEAD 失效
公开(公告)号：JPH01103931A
公开(公告)日：1989-04-21
申请号：JP26095287
申请日：1987-10-16
申请人： HITACHI METALS LTD
发明人： YAMAZAKI MASANOBU , TOMITANI TADASHI , GOTO MAKOTO , KONDO YOSHIO , USHIJIMA MAKOTO
IPC分类号： C03C3/072 , C03C4/00 , C03C8/24
摘要： PURPOSE:To obtain bonding glass for a magnetic head which is capable of drastically raising water resistance and is used with a ferromagnetic amorphous metallic film by constituting it of composition incorporated with specified metallic oxide at a specified rate. CONSTITUTION:Bonding glass for a magnetic head which is used with a ferromagnetic amorphous metallic film is constituted of composition consisting of 72-81wt.% (hereafter %) PbO, 8-12% B2O3, 4-13% ZrO, 2.5-6% SiO2 and 0.2-2% CuO. In the case of using the ferromagnetic amorphous metallic film, in order to prevent magnetic characteristics from being deteriorated by crystallization of the film, it is necessary that the heat-treating process in production of the magnetic head is performed at the temp. lower than a conventional method. In a representative amorphous Co-Ni-Zr film, the upper-limit temp. of heat treatment is generally regulated to 460-500 deg.C. Softening point of bonding glass for the magnetic head used with such the amorphous film is necessarily regulated to the temp. lower then 400 deg.C. This glass incorporating CuO is raised in water resistance and also has low softening point and can be preferably used as bonding glass for the magnetic head used with the ferromagnetic amorphous metallic film.

9. 发明专利

JPS63311610A COMPOSITE MAGNETIC HEAD 失效
公开(公告)号：JPS63311610A
公开(公告)日：1988-12-20
申请号：JP14525887
申请日：1987-06-12
申请人： HITACHI METALS LTD
发明人： GOTO MAKOTO , TOMITANI TADASHI , USHIJIMA MAKOTO
IPC分类号： G11B5/127 , G11B5/23 , G11B5/235
摘要： PURPOSE:To record the transition width of magnetization rapidly by forming a magnetic thin film made of a 'Sendust(R)' only to a gap forming face of an I core and placing the I core to the flowout end of a medium. CONSTITUTION:The thin film 5 made of a 'Sendust(R)' is formed in the thickness of 1-10mum only to a face formed with a front gap 2d and a back gap 2f of the I core 2b, a SiO2 thin film 6 and glass thin film 4a are formed sequentially to the face of the thin film 5 and both or either face of the C core 2a opposed to the face of the thin film 5 to bond the C core 2a and the I core 2b and a step 2s deeper than the depth of gap of the front gap 2d is formed to the face opposed to the medium. Then the magnetic head chip is inserted to a slot 3 of a slider 1 while the I core 2b is directed to the flowout end of the medium. Thus, excellent magnetic characteristic is obtained, occurrence of cracks is less and the composite magnetic head with high reliability is obtained.

10. 发明专利

JPH09320016A MAGNETIC HEAD AND ITS MANUFACTURE 失效
公开(公告)号：JPH09320016A
公开(公告)日：1997-12-12
申请号：JP16048196
申请日：1996-06-03
申请人： HITACHI METALS LTD
发明人： SUDO SHUJI , ITO CHIKAICHI , JINNAI KAORU , FURUICHI SHINJI , YOSHIMURA KUNIAKI , GOTO MAKOTO , TOMITANI TADASHI , KUSAKA KAZUHIRO
IPC分类号： G11B5/31 , G11B5/17
摘要： PROBLEM TO BE SOLVED: To form the conductor coil of a magnetic head formed by the thin-film formation technology into a low electrical resistance coil. SOLUTION: In the magnetic head with a pair of cores 4 (41 and 42) being arranged oppositely through a magnetic gap and a coil part 3 being arranged near the cores, the coil part 3 has a thin-film coil 32 for forming a magnetic flux at the cores, a back yoke 46 made of a magnetic thin film for forming a closed magnetic circuit by magnetically coupling the cores, and a coil pedestal 34 made of a magnetic thin film, and the back yoke 46 and the coil pedestal 34 are arranged on a same layer that is adjacent to the thin-film coil 32, thus making flat a surface where the thin-film coil 32 is formed and forming a multilayer coil and hence expanding the film layer of the thin-film coil 32 and to form a coil with a low electrical resistance.

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