专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

21. 发明专利

JPH0554332A MAGNETIC HEAD AND PRODUCTION THEREOF 失效
公开(公告)号：JPH0554332A
公开(公告)日：1993-03-05
申请号：JP21198091
申请日：1991-08-23
申请人： HITACHI LTD
发明人： OTOMO MOICHI , NAKAMURA HITOSHI , KOBAYASHI TOSHIO , YAMASHITA TAKEO , KOISO YOSHITSUGU
IPC分类号： G11B5/127 , G11B5/31
摘要： PURPOSE:To provide the magnetic head having excellent high-frequency reproduction characteristics. CONSTITUTION:The surface roughness of the substrate surface of the magnetic head formed by using a magnetic film of a fine crystal precipitation type is specified to >=0.05mum and =5MHz is obtd. by using the above-mentioned magnetic film.

22. 发明专利

JPH0529139A CORROSION-PROOF MAGNETIC FILM AND MAGNETIC HEAD UTILIZING THE SAME 失效
公开(公告)号：JPH0529139A
公开(公告)日：1993-02-05
申请号：JP18074791
申请日：1991-07-22
申请人： HITACHI LTD
发明人： NAKAMURA HITOSHI , OTOMO MOICHI , KOISO YOSHITSUGU
IPC分类号： C22C38/00 , G11B5/31 , H01F10/14
摘要： PURPOSE:To obtain a ferromagnetic metal film for magnetic head having high saturation flux density, excellent soft magnetic characteristics and corrosion- proof characteristic. CONSTITUTION:A magnetic film is produced by simultaneously adding the group IVa to VIa element (Hf, Zr, Nb, Ta, Mo, W), oxides thereof, any one of carbide, nitride, boride of these elements and elements selected from Cr, Ru, Rh, Cu into a ferromagnetic metal film of iron family. Thereby, a ferromagnetic metal film which shows good soft magnetic characteristic at a high saturation flux density and also excellent corrosion-proof characteristic can be obtained. Moreover, a magnetic head to which the present invention is applied has provided a stable high playback output for a long period of time.

23. 发明专利

JPH04205908A MAGNETIC REPRODUCING DEVICE 失效
公开(公告)号：JPH04205908A
公开(公告)日：1992-07-28
申请号：JP33710290
申请日：1990-11-30
申请人： HITACHI LTD
发明人： NAKAMURA HITOSHI , OTOMO MOICHI , YAMASHITA TAKEO
IPC分类号： G11B5/39
摘要： PURPOSE:To attain a narrow gap and to obtain high reproducing efficiency by combining the magneto-optical effect and a magnetoresistance sensor and reading the direction of magnetization recorded on a medium by the magneto- optical effect. CONSTITUTION:The subject device is provided with a circuit for detecting the direction of magnetization recorded on the magnetic recording medium by the magneto-optical effect and changing a sign of a voltage change between terminals corresponding to a resistance change of the magnetoresistance sensor by the direction of magnetization of the medium. That is, the magnetic recording device is composed of the recording medium, the magnetoresistance sensor and moreover a reproducing system (Kerr effect) having the application of the magneto-optical effect. In this case, since a Kerr rotary angle is changed by the direction of magnetization of the recording medium, the direction of magnetization can be obtained from the intensity of a Kerr signal. Moreover, the absolute value of the Kerr signal intensity is not important, and it is enough to obtain an S/N (signal output/noise output) required for deciding whether the direction of magnetization from the Kerr signal intensity is 1 or 0. By this method, a narrow gap is formed, and a high reproducing output is obtained.

24. 发明专利

JPH03268216A COMPOSITE BIAS MAGNETORESISTANCE EFFECT HEAD AND PRODUCTION THEREOF 失效
公开(公告)号：JPH03268216A
公开(公告)日：1991-11-28
申请号：JP6419190
申请日：1990-03-16
申请人： HITACHI LTD
发明人： KITADA MASAHIRO , SHIMIZU NOBORU , TANABE HIDEO , SHIGEMATA KAZUHIRO , YUHITO ISAMU , OTOMO MOICHI , KOYAMA NAOKI
IPC分类号： G11B5/39
摘要： PURPOSE:To obtain the composite bias magnetoresistance effect head which is improved in heat resistance by continuously forming 'Permalloy(R)' and Nb films on a substrate to impart the electrical conduction of both and oxidizing the surface of Nb thereafter, then forming a soft magnetic material film. CONSTITUTION:The 'Permalloy(R)' 2 which is a magnetoresistance effect material is formed by a vapor deposition method on an insulator substrate 1 and in succession, the Nb 3 is formed by the vapor deposition method thereon to impart the electrical conduction of both. The surface of the Nb 3 is then oxidized to form an electrical insulating layer, by which a shunt film 3 is obtd. An Fe-Si alloy film 4 which is a soft magnetic material is formed by a sputtering method thereon. The composite bias magnetoresistance effect type element to which the shunt bias by the Nb and the soft magnetic material bias by the Fe-Si alloy film are impressed is obtd. in this way. Au or Al is deposited by evaporation as an electrode 5. Consequently, the width for adoption of the high-temp. process for the production of the magnetic head is expanded and the life and reliability when the head is operated at a high current density are improved.

25. 发明专利

JPH02130711A MAGNETO-RESISTANCE EFFECT ELEMENT AND MAGNETIC HEAD USING THEREOF 失效
公开(公告)号：JPH02130711A
公开(公告)日：1990-05-18
申请号：JP28358888
申请日：1988-11-11
申请人： HITACHI LTD
发明人： OTOMO MOICHI , KUMASAKA TAKAYUKI , YAMASHITA TAKEO , NAKAMURA HITOSHI , TANABE HIDEO , KOYAMA NAOKI
IPC分类号： G11B5/39 , H01L43/08
摘要： PURPOSE:To reduce Barkhausen noise by piling up multiple magneto-resistance effect films with nonmagnetic insulating layers in between and plural blocks of the multiple magneto-resistance effect films with insulating layers in between, with each block being constituted of a pair of magneto-resistance effect films connected in series by making detecting currents to flow in opposite directions. CONSTITUTION:Multiple magneto-resistance effect films 1 of 'Permalloy(R)', etc., are piled up with nonmagnetic insulating layers 11 and 12 of SiO2, etc., in between and each magneto-resistance effect films block A 9 is constituted of a pair of the films 1. Then detecting currents 13 are made to flow to the films of each block in the opposite directions from a constant-current power source. In addition, similar blocks B 10 are constituted and the blocks A and B 9 and 10 are alternately piled up with insulating layers 12 in between and wiring is made between the blocks A and B 9 and 10 so that the detecting currents can flow serially between the blocks A and B 9 and 10. Since bias magnetic fields 14 produced by the detecting currents received from adjacent effective films 1 are applied in the same direction in the same block and in the opposite direction between blocks, signal magnetic fields from a recording medium 5 can be reproduced with high sensitivity when the voltage thus produced is detected with a differential amplifier 6.

26. 发明专利

JPH0290505A FERROMAGNETIC FILM AND MAGNETIC HEAD USING SAME 失效
公开(公告)号：JPH0290505A
公开(公告)日：1990-03-30
申请号：JP24098988
申请日：1988-09-28
申请人： HITACHI LTD
发明人： NAKATANI RYOICHI , KOBAYASHI TOSHIO , OTOMO MOICHI , KUMASAKA TAKAYUKI
IPC分类号： C22C38/00 , G11B5/127 , H01F10/14 , H01F10/32
摘要： PURPOSE:To achieve a laminated ferromagnetic film with high relative permeability by causing an Fe-B alloy film to have a laminated structure through interposing films having a different composition. CONSTITUTION:This film comprises an Fe-B alloy. The composition of this alloy is such as: 1 and more than 1 atomic % and less than 4 atomic % of B, and the remainder of F, and having a body centered cubic structure. The Fe-B alloy is fabricated by a film fabricating process, and the concentration of B is made to be 1 and more than 1 atomic % and less than 4 atomic %, so that the absolute value of the magnetostriction constant can be made to be not larger than 2X10 and a bcc single phase thin film can be obtained by this composition. Further, the corrosion resistance can be improved scarcely deteriorating the magnetic characteristics by adding 0.5-1 atomic % of at least one element selected from the group consisting of Ru, Rh, Pd, Ag, Os, Ir, Pt, Au to the Fe-B alloy. Further, the soft magnetic characteristics can be improved by adding 0.5-3 atomic % of at least one element selected from a group consisting of Al, Si, P, Ga, Ge, As, Cr, Nb, Ta, Ti to the Fe-B alloy.

27. 发明专利

JPH0249209A MAGNETIC HEAD 失效
公开(公告)号：JPH0249209A
公开(公告)日：1990-02-19
申请号：JP19792088
申请日：1988-08-10
申请人： HITACHI LTD
发明人： SASAKI SHINOBU , OTOMO MOICHI , KUMASAKA TAKAYUKI , YAMASHITA TAKEO
IPC分类号： G11B5/31
摘要： PURPOSE:To obtain a magnetic head with a superior recording and reproducing characteristic by forming a nonmagnetic metallic layer so as to cover a thin film coil partially via an insulating layer. CONSTITUTION:The magnetic head is constituted of the thin film coil 1, a magnetic pole 4 to be coupled with the coil magnetically, the insulating layer 5' for the insulation of the thin film coil 1, and a lead wire 12. Furthermore, the insulating layer 5 is formed extending over the whole of the magnetic head, and an upper nonmagnetic metallic layer 2' to reduce inductance is formed on the layer 5. Since the whole of the magnetic head is enclosed with the nonmagnetic metallic layer 2' via the insulating layer 5 by employing such structure, surplus leakage magnetic flux can be interrupted from the thin film coil 1, which reduces the inductance. Also, since the magnetic pole 4 is enclosed without inserting the nonmagnetic metallic layer 2' between the coil 1 and the magnetic pole 4 at a part where the coil 1 is enclosed with the magnetic pole 4, magnetic joint between the magnetic pole 4 and the coil 1 is not disturbed.

28. 发明专利

JPH01264611A MANUFACTURE OF COMPOUND TYPE MAGNETIC HEAD 失效
公开(公告)号：JPH01264611A
公开(公告)日：1989-10-20
申请号：JP5380689
申请日：1989-03-08
申请人： HITACHI LTD
发明人： KUMASAKA TAKAYUKI , FUJIWARA HIDEO , OTOMO MOICHI , YAMASHITA TAKEO
IPC分类号： G11B5/127 , G11B5/187
摘要： PURPOSE:To obtain a construction to cause an eddy current loss to be small by providing a process to cause a magnetic substance to adhere onto at least the groove surface of a surface at the gap formed side of a substrate block. CONSTITUTION:To a compound type magnetic head, a kerf for deciding a track width is provided. A ferrite part with a width narrower than the track width is left in both side parts of ferrite projecting parts 35 and 35', and they are formed from a core front part to a rear part in both edge parts. In such a case, on a magnetic tape sliding surface, when a shape is formed as to be made wider as the ferrite projecting parts 35 and 35' are separated from an operating gap 32, a film formation can be efficiently executed by sputtering a metallic magnetic substance film from the operating gap surface side at the time of a core half body. Since the metallic magnetic substance film is divided into two lines, the influence of an eddy current can be reduced even in the case of a single layer film.

29. 发明专利

JPH01264610A COMPOUND TYPE MAGNETIC HEAD 失效
公开(公告)号：JPH01264610A
公开(公告)日：1989-10-20
申请号：JP5380589
申请日：1989-03-08
申请人： HITACHI LTD
发明人： KUMASAKA TAKAYUKI , FUJIWARA HIDEO , OTOMO MOICHI , YAMASHITA TAKEO
IPC分类号： G11B5/127 , G11B5/187 , G11B5/23
摘要： PURPOSE:To guarantee the strength of the whole head by filling a space formed of the magnetic substances of side surfaces to be mutually opposed of the projecting parts of two substrate blocks with a nonmagnetic substance. CONSTITUTION:The track width of a compound type magnetic head is made narrower than a core width, and a kerf for deciding the track width is provided. The kerf is formed from a core front part to a core rear part in both edge parts in leaving a ferrite part with a width narrower than the track width on a surface at the gap formed side of a ferrite block. Metallic substance materials 30 and 30' are made to adhere towards the side part of the left ferrite projecting part by a spattering or a thin film forming technique such as a vacuum evaporation. A groove part is filled with nonmagnetic substances 33 and 33' such as a glass, a ceramic and a resin as reinforcing materials. In such a case, ferrite projecting parts 35 and 35' are made into the core of a metallic magnetic substance film, a wear resistance can be guaranteed, and a mechanical strength can be also increased.

30. 发明专利

JPH01125909A LAMINATED MAGNETIC THIN FILM AND MAGNETIC HEAD USING SAME 失效
公开(公告)号：JPH01125909A
公开(公告)日：1989-05-18
申请号：JP28325287
申请日：1987-11-11
申请人： HITACHI LTD
发明人： NAKATANI RYOICHI , KOBAYASHI TOSHIO , OTOMO MOICHI , KUMASAKA TAKAYUKI
IPC分类号： G11B5/147 , G11B5/31 , H01F10/00 , H01F10/30
摘要： PURPOSE:To obtain a laminated magnetic thin-film having a low coercive force, high permeability, and high saturation magnetic-flux density by forming a laminated structure of Fe thin-film or Fe alloy thin-film, a non-magnetic material consisting of one or more kinds of elements chosen from a group of B, C, N, Si intervening between the films. CONSTITUTION:An thin-film 11 of a Fe alloy or with Fe as a main ingredient is laminated on a substrate 13 through a non-magnetic magnetic material 12 composed of at least one or more elements chosen from a group of B, C, NC, Si. Although a saturation magnetic flux density decreases by the influence of the lamination, the saturation magnetic flux density can be increased than that of a laminated layer through Si, O2, Al2O3, so a lamination magnetic thin- film having low coercive force and high magnetic permeability can be obtained.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式