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1. 发明专利

JP2001006129A WRAPPING GUIDE FOR MR ELEMENT AND METHOD FOR MEASURING STRIPE HEIGHT 失效
公开(公告)号：JP2001006129A
公开(公告)日：2001-01-12
申请号：JP17486299
申请日：1999-06-22
申请人： SONY CORP
发明人： MURAKAMI AKIRA
IPC分类号： G11B5/39 , G11B5/455
摘要： PROBLEM TO BE SOLVED: To exactly measure stripe height without being affected by the distribution of the film thickness of a wafer or the distribution of a volume resistance rate in a simple structure regardless of the element constitution of the head. SOLUTION: Plural MR elements are formed in parallel on a wafer, and patterns for detecting the volume resistance rate of each element are formed at the both edges of the element working part so that a wrapping guide can be constituted. The pattern is constituted of at least three leads 21 formed with different intervals on an MR element detecting part 22 formed in the same process as each element.

2. 发明专利

JPH09305925A MAGNETORESISTANCE EFFECT ELEMENT AND MAGNETORESISTANCE EFFECT TYPE MAGNETIC HEAD 失效
公开(公告)号：JPH09305925A
公开(公告)日：1997-11-28
申请号：JP12027396
申请日：1996-05-15
申请人： SONY CORP
发明人： MURAKAMI AKIRA
IPC分类号： G11B5/39
摘要： PROBLEM TO BE SOLVED: To enable a magneto resistance effect film to be a single magnetic domain and suppress the generation of Barkhausen noises even when a magnetism-sensitive part has a wide width, buy layering an antiferromagnetic film at a part of the magnetism-sensitive part. SOLUTION: A magneto resistance effect element 1 of an SAL bias method is comprised of an SAL film 2, a non-magnetic spacer film 3, a magneto resistance effect film 4 and an antiferromagnetic film 5 layered sequentially. A magnetism-sensitive part sensing a magnetic field among the magneto resistance effect film 4 is a part located between electrodes 6 and 7. The antiferromagnetic film 5 is formed to be in touch with the whole face of the magnetism-sensitive part. Accordingly, the films 4 and 5 are exchange-coupled all over the face of the magnetism-sensitive part, and a magnetic domain of the film 4 is rendered more stable.

3. 发明专利

JPH08212520A SPIN VALVE AND ITS PRODUCTION 失效
公开(公告)号：JPH08212520A
公开(公告)日：1996-08-20
申请号：JP2070395
申请日：1995-02-08
申请人： SONY CORP
发明人： MURAKAMI AKIRA
IPC分类号： G11B5/39 , G11B5/147
摘要： PURPOSE: To make it possible to easily form a spin valve by providing this spin valve with a pinning layer having plural blocks isolated from each other in the longitudinal direction. CONSTITUTION: This spin valve consists of four layers; a pinning layer 21, a first magnetic reluctance material layer 22, an intermediate layer 23, a second magnetic reluctance material layer 24. The pinning layer 21 has the plural blocks 21A across spacings 21B. These blocks 21A form a slender shape, by which shape anisotropy is generated in the longitudinal direction (X axis). The respective blocks 21A are, therefore, provided with magnetization axes in their longitudinal direction (X axis) by the shape anisotropy and are arranged along the minor axis direction (X axis) of the pinning layer 21. Then, the pinning layer 21 has the axis of easy magnetization along the minor axis direction. As the result, the pinning layer 21 is formable out of a ferromagnetic material by the simple method without subjecting the material to an anisotropic treatment.

4. 发明专利

JPH05128431A MAGNETIC HEAD 失效
公开(公告)号：JPH05128431A
公开(公告)日：1993-05-25
申请号：JP28639591
申请日：1991-10-31
申请人： SONY CORP
发明人： URAI AKIRA , SATO HEIKICHI , MURAKAMI AKIRA
IPC分类号： G11B5/23
摘要： PURPOSE:To improve the productivity and yield of the magnetic head constituted of a metal-in-gap type by decreasing the distortions and peeling of the magnetic metallic thin films thereof. CONSTITUTION:A least one of magnetic core half bodies 11 and 12 are constituted of oxide magnetic material parts 1 and 2 and the magnetic metallic thin film part 3. A pair of such magnetic core half bodies 11 and 12 are butted against each other and a magnetic gap g is formed on the butt surface of the magnetic metallic thin film 3 part, by which the magnetic head 20 is constituted. The magnetic metallic thin film part 3 is constituted by laminating a magnetic metallic thin films and an insulating layer. This insulating layer is constituted of at least one kind of Fe and element M and the oxide thereof. The element M is selected from Al, Ga, Zr, Nb, Ru, and Ta.

5. 发明专利

JPH05101321A MAGNETIC HEAD 失效
公开(公告)号：JPH05101321A
公开(公告)日：1993-04-23
申请号：JP29048691
申请日：1991-10-11
申请人： SONY CORP
发明人： TERASAWA AKIHIKO , MURAKAMI AKIRA , OGATA SEIICHI , SAITO TADASHI , EGUCHI HIRONARI , SUGANO TAKASHI , KOBAYASHI TOMIO
IPC分类号： G11B5/127
摘要： PURPOSE:To enhance the magnetic permeability by thinning a working modified layer. CONSTITUTION:Halves 7, 8 of a magnetic core connected integrally while holding metallic magnetic films 1, 2 therebetween with a pair of substrates 3, 4, 5, 6 in the direction of the film thickness are abutted on each other so that the terminated faces of the metallic magnetic films are opposed to each other and a magnetic gap (g) is constituted between the abutting surfaces of the metallic magnetic films 1, 2. By notched grooves 12, 13 notching the metallic magnetic films 1, 2 provided on the magnetic gap part from the one side in the direction to the film thickness, the track width Tw of the magnetic gap (g) is regulated.

6. 发明专利

JPH0581610A PRODUCTION OF CORE MATERIAL FOR MAGNETIC HEAD 失效
公开(公告)号：JPH0581610A
公开(公告)日：1993-04-02
申请号：JP27048191
申请日：1991-09-24
申请人： SONY CORP
发明人： SATO HEIKICHI , MURAKAMI AKIRA
IPC分类号： G11B5/23
摘要： PURPOSE:To produce a core material for a magnetic head with a magnetic metal film with high dimensional accuracy at a low cost. CONSTITUTION:Plural projections 2 are formed on one principal face of a first substrate 1 at prescribed pitches and grooves 4 for fixing the projections 2 are formed in a second substrate 3. The projections 2 are fixed in the grooves 4 and a magnetic metal film 5 is formed between the grooves 4 and the projections 2. The substrates 1, 3 are then integrated by joining and the first substrate 1 is polished until one principal face 3a of the second substrate 3 is exposed.

7. 发明专利

JPH1131305A MAGNETIC HEAD DEVICE 失效
公开(公告)号：JPH1131305A
公开(公告)日：1999-02-02
申请号：JP18413497
申请日：1997-07-09
申请人： SONY CORP
发明人： MURAKAMI AKIRA
IPC分类号： G11B5/31 , G11B5/265
摘要： PROBLEM TO BE SOLVED: To surely shield magnetically between a plurality of magnetic heads by providing the plurality of magnetic heads arranged in the traveling direction of a magnetic recording medium and providing at least a coil between a reproducing magnetic head and a recording magnetic head. SOLUTION: A substrate 8A, a recording magnetic head 5, a coil 7, a reproducing magnetic head 6 and a substrate 8B are formed in parallel to the traveling direction arrow A of a magnetic tape. A prescribed current is supplied to a recording coil 14 in recording, and at this point, a part of an AC magnetic field generated from the recording coil 14 and a magnetic gap G is leaked out from the recording magnetic head 5. This leakage magnetic field is electromagnetically converted by the coil 7 to become a current flowing to the coil 7 and the vertical component of the leakage magnetic field is canceled by the coil 7 not to reach the reproducing magnetic head 6. Thus, the magneto-resistive effect element 16 of the reproducing magnetic head 6 can detect the signal magnetic field of the magnetic tape without being interfered with the leakage magnetic field.

8. 发明专利

JPH05242419A 失效
公开(公告)号：JPH05242419A
公开(公告)日：1993-09-21
申请号：JP27616191
申请日：1991-09-30
申请人： SONY CORP
发明人： SATO HEIKICHI , URAI AKIRA , KIMURA HITOSHI , MURAKAMI AKIRA , KOSAKA MASAYA , ONODERA OSAMU
IPC分类号： G11B5/23
摘要： PURPOSE:To prevent the peeling of a metallic magnetic thin film and also to prevent the crack of a magnetic core material. CONSTITUTION:After a first groove 2 having a slope 2a inclinded against a face 1a to be a magnetic gap forming surface is formed a base plate 1, an oxidized reactive base film 3 is formed at the slope 2a of the first groove 2, and the metallic magnetic thin film 4 is formed on the oxidized reactive base film 3. Then a second groove for controlling a track width is formed adjacent to the slope 2a and a head core block is formed and the head core blocks are connected with each other and then cut to a head chip.

9. 发明专利

JPH04278205A MAGNETIC HEAD 失效
公开(公告)号：JPH04278205A
公开(公告)日：1992-10-02
申请号：JP6372491
申请日：1991-03-06
申请人： SONY CORP
发明人： KOBAYASHI TOMIO , SATO HEIKICHI , KOJIMA HIDEAKI , URAI AKIRA , MURAKAMI AKIRA , IKEDA YOSHITO , YOKOMIZO MITSUAKI , OKADA TOSHIYUKI
IPC分类号： G11B5/23 , G11B5/187
摘要： PURPOSE:To obtain constant contact characteristic to magnetic recording medium and prevent generation of artificial gap by keeping the area of a metal magnetic thin film constant which is arranged at a magnetic gap provided at the magnetic recording medium sliding surface even if such magnetic recording medium sliding surface is worn up to the depth zero position. CONSTITUTION:In a magnetic head structured by integrally joining a pair of magnetic core half bodies comprising metal magnetic thin films 3, 4 and substrates 1, 2 via a gap film 7 with the metal magnetic thin films 3, 4 used as the butting surfaces, the depth Dp zero position of a magnetic gap g is set closer to the side of magnetic recording medium sliding surface 12 than the cutout part starting position A on the side of the magnetic gap g of the one coil groove 11.

10. 发明专利

JPH01138603A MAGNETIC HEAD 失效
公开(公告)号：JPH01138603A
公开(公告)日：1989-05-31
申请号：JP29665487
申请日：1987-11-25
申请人： SONY CORP
发明人： KOBAYASHI TOMIO , OKADA TOSHIYUKI , MURAKAMI AKIRA , OKAWA YOJIRO
IPC分类号： G11B5/127
摘要： PURPOSE:To prevent the generation of a pseudo gap by making a core thickness on a recording medium sliding surface approximately equal to a track width and extending a magnetic thin metallic film up to the side surface part of a head core part at least near a magnetic gap. CONSTITUTION:For head core parts 9 and 10, track width regulating grooves 12a and 12b are formed so that a core thickness on a recording medium sliding surface 11 can be the same width as a track width W and a magnetic thin metallic film 14 is extended up to side surface parts 9a and 9b of track width regulating grooves 12a and 12b of the core part 9 near a magnetic gap 8. Consequently, the interface edge part of the head core part 9 and the film 14 is not directly brought into contact with a glass 16. Consequently, both edge parts K1 and K2 of an interface K of a magnetic gap part 14a and the head core part 9 which are filmed in parallel to the magnetic gap 8 are covered with side surface films 14b and 14c of the magnetic metallic film and not brought into contact with the glass 16. Thus, the component of the glass 16 is not permeated to the interface K, a response layer is not formed and the pseudo gap generation is prevented.

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