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11. 发明专利

JPH01107313A THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JPH01107313A
公开(公告)日：1989-04-25
申请号：JP26380887
申请日：1987-10-21
申请人： HITACHI LTD
发明人： YONEYAMA TOMOKO , KISHIMOTO SEIJI , ARAI NOBUO , ONO HIROAKI , AKAI HIROSHI , MORII TOSHIE
IPC分类号： G11B5/31
摘要： PURPOSE:To reduce the loss of an interval and to improve the efficiency of recording and reproduction by respectively setting the size of a non-magnetic substrate and a protective layer in a contacting area with a recording medium according to their abrasion characteristic. CONSTITUTION:The contacting area of the non-magnetic substrate 1 and the protective layer 5 are made to be different according to the abrasion resistance of material forming the respective things. That means, when the abrasion characteristic of the substrate 1 and the layer 5 are different, phenomenon which the softer one is optionally scraped, for example, does not occur when the recording medium and a magnetic head are slided by making the contacting area of the substrate 1 (the thickness d1 or the area) and the contacting area of the layer 5 (the thickness d2 or the area) to be different. Therefore, the contact of a magnetic gap 3 and the recording medium is always good. Thus, the abrasion resistance of the thin filmed magnetic head is improved and the efficiency of recording and reproduction is improved.

12. 发明专利

JPS6488911A THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JPS6488911A
公开(公告)日：1989-04-03
申请号：JP24371687
申请日：1987-09-30
申请人： HITACHI LTD
发明人： ARAI NOBUO , KISHIMOTO SEIJI , ONO HIROAKI , AKAI HIROSHI , YONEYAMA TOMOKO , MORII TOSHIE
IPC分类号： G11B5/31
摘要： PURPOSE:To obtain a head excellent in a reproducing efficiency and suitable to a high density magnetic recording by having a magnetic gap formed by the laminated layer of a magnetic thin film and a non-magnetic thin film at one side core half body. CONSTITUTION:The head is formed by non-magnetic substrates 1 and 6, a front magnetic core 2, a magnetic gap 3, a coil 4, terminals 4a and 4b and a rear magnetic core 5. By sticking together with a glass or a resin so that joining parts 5a and 5b of the rear magnetic core 5 can be coincident to joining parts 2a and 2b of the front magnetic core 2 respectively, a thin film magnetic head is manufactured. In short, to a first substrate 6, the rear magnetic core 5 is formed, the front magnetic core 2 and the coil 4 including the magnetic gap 3 laminated and formed at a second substrate 1 are formed, both substrates are stuck together so as to coincide magnetic core joining parts 5a and 5b and 2a and 2b, thus, a thin film magnetic head considering the shortening of the magnetic path length is obtained, further, a manufacturing process per substrate can be decreased, and therefore, the number of the days of the manufacturing of the thin film magnetic head can be made into about 10 days.

13. 发明专利

JPS63293711A MULTI-ELEMENT THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JPS63293711A
公开(公告)日：1988-11-30
申请号：JP12814787
申请日：1987-05-27
申请人： HITACHI LTD
发明人： ARAI NOBUO , KISHIMOTO SEIJI , ONO HIROAKI , AKAI HIROSHI , YONEYAMA TOMOKO
IPC分类号： G11B5/31
摘要： PURPOSE:To measure the depth of a gap with high accuracy by forming grooves in the vicinity of a magnetic gap on a magnetic core in the direction of gap depth. CONSTITUTION:The grooves 7a, 7b in the gap depth direction are formed on a face opposed to a face in contact with a ground film 6 of magnetic cores 1a, 1b consisting of amorphous, 'Sendust(R)', 'Permalloy(R)', etc., so as to include magnetic gaps 2a, 2b. When the gap depth of the magnetic gaps 2a, 2b is defined as (gd), the width W of the grooves 7a, 7b along a sliding face is set up to gd=W-10 for instance so as to be increased in accordance with separation from the sliding face with linear relation to the gap depth (gd). Consequently, the grooves 7a, 7b fulfills a function as gap depth marks, and at the time of working the sliding face, the gap depth (gd) can be set up to a required value with high accuracy by monitoring the width W of the grooves 7a, 7b.

14. 发明专利

JPS63261511A THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JPS63261511A
公开(公告)日：1988-10-28
申请号：JP9516187
申请日：1987-04-20
申请人： HITACHI LTD
发明人： ONO HIROAKI , KISHIMOTO SEIJI , ARAI NOBUO , AKAI HIROSHI , YONEYAMA TOMOKO , MORII TOSHIE , ONUKI HIDEO , YOSHIDA TAKAHIKO
IPC分类号： G11B5/31 , G11B5/37
摘要： PURPOSE:To shorten the magnetic path length and to improve the reproducing efficiency by providing a Hall element between the upper and lower cores forming a magnetic core and performing the recording and reproducing jobs by means of a coil and the Hall element respectively. CONSTITUTION:A gap 7, a lower core 1a, a Hall element 6 and an upper core 1b are set around a coil 2 for production of a magnetic circuit of a magnetic head. At the same time, five electrodes, i.e., a bias electrode 3, the output electrodes 4 and 4, and the earth electrodes 5 and 5 are provided around the element 6. In other words, a recording action is carried out by a coil of a single or several turns and a reproducing action is carried out by a Hall element. Thus, it is possible to decrease the number of turns of a coil and therefore to shorten the magnetic path length.

15. 发明专利

JPS6371914A REPRODUCING HEAD 失效
公开(公告)号：JPS6371914A
公开(公告)日：1988-04-01
申请号：JP21575586
申请日：1986-09-16
申请人： HITACHI LTD
发明人： MIURA YOSHITSUGU , TANAKA KATSUYUKI , KATAHASHI HISASHI , SAITO MASAKATSU , ARAI NOBUO
IPC分类号： G11B5/39
摘要： PURPOSE:To improve efficiency of reproduction by installing a metallic thin filmy magnetic substance having magneto-resistance effect in a part of a magnetic core having a magnetic gap and forming a closed magnetic circuit and making magnetic flux of reproduced signals flow in and flow out nearly parallel to the direction of film thickness of the metallic thin filmy magnetic substance. CONSTITUTION:Uniaxial anisotropy that makes the direction of track width (perpendicular to the face of paper) an axis of easy magnetization is applied to upper cores 21, 21' and a magneto-resistance effect element 22. By supplying current (DC) to a bias coil 27, flow of magnetic flux is generated in the upper core and lower core. In the magneto-resistance effect element 22, the magnetic flux flows in the direction of film thickness. Consequently, magnetization of the magneto-resistance effect element inclines in the direction of film thickness and biased to an optimum operation point. Thus, a yoke type magneto-resistance effect head of high reproduction efficiency is realized.

16. 发明专利

JPS61284817A THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JPS61284817A
公开(公告)日：1986-12-15
申请号：JP12607185
申请日：1985-06-12
申请人： HITACHI LTD
发明人： MIURA YOSHITSUGU , KATAHASHI HISASHI , ARAI NOBUO
IPC分类号： G11B5/23 , G11B5/245 , G11B5/31
摘要： PURPOSE:To obtain the structure of a thin film magnetic head which obviates the decrease of a track width during reproduction by forming the surface of the head to slidingly contact with a medium in such a manner that the length of the upper and lower magnetic layers thereof in the track width direction is larger than a desired track width, that the magnetic gap length in the part corresponding to the length of the desired track width is uniform and that the magnetic gap length in the part except said parts gently increases. CONSTITUTION:The thin film magnetic head constituted by successively laminating the lower magnetic layer, nonmagnetic gap material, nonmagnetic inter layer material, metallic conductor layer and upper magnetic layer is so constructed that the length of the gap 14 consisting of the nonmagnetic material is uniform in the part where the length (Tomega+W) in the track width direction of a wing type magnetic core corresponds to the desired track width and that the length gradually increases in the other parts except said part. The thin film magnetic head which obviates the decrease of the effective track width during reproduction is thus obtd.

17. 发明专利

JPS58128016A THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JPS58128016A
公开(公告)日：1983-07-30
申请号：JP999282
申请日：1982-01-27
申请人： HITACHI LTD
发明人： OOSHIMA ISAO , SAITOU MASAKATSU , YAMADA MASAMICHI , ARAI NOBUO , TANAKA KATSUYUKI
IPC分类号： G11B5/17 , G11B5/31
摘要： PURPOSE:To apply cylindrical shaping to a plurality of head chips on the same train at the same time before the head chips are separated, by providing a groove becoming deeper with its end at a lead terminal and forming the lead terminal so as to be laid in this groove. CONSTITUTION:The groove 9 having a taper 8, 30-100mum in depth, becoming deeper with its end is provided at the lead terminal of a base 1, a head element is formed on the base 1 and the lead terminal 32 is formed to be bridged over the groove 9. When the head chips are incorporatedly formed, a reinforced plate is fitted on a protecting film 7 before the chips are separated, the chip cut section is sliced and a head holder is fitted in this state. Thus, a plurality of chips are arranged and each chip is fitted with the reinforced plate and the head holder, allowing to cylindrically shape the plurality of chips at the same time.

18. 发明专利

JPS58128013A THIN FILM MAGNETIC HEAD ELEMENT 失效
公开(公告)号：JPS58128013A
公开(公告)日：1983-07-30
申请号：JP998282
申请日：1982-01-27
申请人： HITACHI LTD
发明人： YAMADA MASAMICHI , ARAI NOBUO
IPC分类号： G11B5/187 , G11B5/23 , G11B5/31
摘要： PURPOSE:To attain accurate head polishment and to make the circuit integration easy at the manufacture of a head element, by forming each polishment electrode just above an insulating substrate and connecting a part of one end of each electrode on a conductive lower magnetic substance layer formed on the insulating substrate. CONSTITUTION:Polishing electrodes 5, 6 are formed just above the insulating substrate 1 and only the parts 5c, 6c are formed on a conductive lower magnetic substance layer 2. A magnetic head current flows between bonding pads 3a, 9a, and an electric signals of the electrodes 5, 6 is detected between bonding pads 5a, 9a and between 6a, 9a. Since the electrodes 5, 6 and the bonding pads 5a, 6a are provided just above the substrate 1, even if polishment is performed to B-B' plane with a conventional polishment and droops 11a, 11b due to the electrode polishment are caused, the bonding pads and the electrodes are not electrically short-circuited, allowing to attain highly accurate polishment. The number of the bonding pads is halved than those of conventional systems, giving convenience for the circuit integration at the manufacture of the head element.

19. 发明专利

JP2001195757A OBJECTIVE LENS DRIVE ASSEMBLY 失效
公开(公告)号：JP2001195757A
公开(公告)日：2001-07-19
申请号：JP2000006058
申请日：2000-01-11
申请人： HITACHI LTD
发明人： ARAI NOBUO , MORI HIROMITSU
IPC分类号： G11B7/09
摘要： PROBLEM TO BE SOLVED: To provide an objective lens drive assembly which is simple in constitution, good in mass productivity and high in rigidity in a rolling direction and a disk device or a magneto-optical disk device having a good servo characteristic. SOLUTION: A lens holder which holds the objective lens, a suspension member which supports the lens holder at one end, a fixing section holder which fixes and supports the other end of the suspension member, a joint part of the lens holder 1 and the suspension member 2 and a joint part of the suspension member 2 and the fixing section holder 13 are integrally formed. The suspension section is provided conductor patterns. The sectional shape of the suspension member is formed to a shape at which sectional secondary moment increases.

20. 发明专利

JP2001118267A OBJECTIVE LENS DRIVING DEVICE AND OPTICAL DISK DEVICE 失效
公开(公告)号：JP2001118267A
公开(公告)日：2001-04-27
申请号：JP29760299
申请日：1999-10-20
申请人： HITACHI LTD
发明人： MORI HIROMITSU , ARAI NOBUO
IPC分类号： G11B7/09
摘要： PROBLEM TO BE SOLVED: To provide an objective lens driving device for an optical pickup, capable of being miniaturized and superior in mass-productivity. SOLUTION: This driving device is composed of a focus coil 104, tracking coils 105, magnets 107 arranged opposite to these coils, and yokes 106 to which the magnets 107 are attached; in this driving device, the magnets 107 are each formed in a manner that the two sides (width and height) of a face vertical to the magnetizing direction are each formed equally in the size A.

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