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1. 发明专利

JP2003346332A Magnetic disk unit and manufacturing method therefor 审中-公开
标题翻译：磁碟单元及其制造方法
公开(公告)号：JP2003346332A
公开(公告)日：2003-12-05
申请号：JP2002150959
申请日：2002-05-24
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： TANABE MASANORI , HIGUCHI SHINSUKE , NAKAZAWA TAKESHI
IPC分类号： G11B5/09 , G11B5/00 , G11B5/02 , G11B5/31 , G11B5/39 , G11B5/84 , G11B20/10
摘要： PROBLEM TO BE SOLVED: To provide a magnetic disk unit and a manufacturing method of the magnetic disk unit that prevent troubles due to thermal protrusion phenomenon in a magnetic head, in advance.
SOLUTION: In the manufacturing process of the magnetic disk unit, write operation or the like is carried out, while the write current is increased, and then defect search and registration are conducted.
COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：提供一种磁盘单元及其制造方法，该磁盘单元预先防止磁头中的热突起现象引起的故障。解决方案：在磁盘单元的制造过程中，执行写入操作等，同时增加写入电流，然后进行缺陷搜索和配准。版权所有（C）2004，JPO

2. 发明专利

JP2002334408A THIN FILM MAGNETIC HEAD, ITS MANUFACTURING METHOD, AND MAGNETIC DISK DEVICE USING THE THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JP2002334408A
公开(公告)日：2002-11-22
申请号：JP2001135051
申请日：2001-05-02
申请人： HITACHI LTD
发明人： KUWAZUKA SHUNICHIRO , TANABE MASANORI
IPC分类号： G11B5/31
摘要： PROBLEM TO BE SOLVED: To meet the demand of narrowing a track width, and to prevent writing exudation by securing a writing magnetic flux. SOLUTION: The thin film magnetic head is provided with an upper core, a lower core, and a gap part formed between both cores. Either the upper or the lower cores has a structure where a stepped shape of 3 or more layers is formed, and the dimension of a track width direction is reduced toward the gap part. The other of the upper or the lower core has the structure of a 2-layer stepped shape whose dimension is equal to that in the track width direction contacting the gap part. Either the upper core or the lower core has the structure of a tapered shape whose dimension in the track width direction is gradually reduced toward the gap part. The other one of the upper or the lower core has the structure of a 2-layer stepped shape whose dimension is equal to that in the track width direction contacting the gap part.

3. 发明专利

JPH103603A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH103603A
公开(公告)日：1998-01-06
申请号：JP15520296
申请日：1996-06-17
申请人： HITACHI LTD
发明人： TANABE MASANORI , MATSUYAMA IWAO
IPC分类号： G11B5/39 , G11B5/02 , G11B20/18
摘要： PROBLEM TO BE SOLVED: To avoid the occurrence of fault in a device by detecting thermal asperity caused by succeedingly contact of a magnetic disk medium with an MR element and error registering its adjacent tracks. SOLUTION: An MR head 7 scans on the magnetic disk media 8 of at least a sheet or above fixed onto a rotary body by a carriage 9 in the radial direction of the medium. A servo control circuit 10 scans the MR head 7, and the scanning head 7 reproduces a concentric circle positioning signal written in advance in the medium 8 to recognize a track position. A drive controller 11 detects a thermal asperity TA signal caused by the contact of the MR element with a projection part on the magnetic disk medium by a reproduced signal which is amplified by a recording/reproducing control circuit 12 from the head 7, and retreats the data to an area prepared in advance by a control part 14. Then, the controller 11 error-registers the adjacent tracks.

4. 发明专利

JPH08167121A METHOD FOR DETECTING ABNORMAL PROJECTION ON MAGNETIC DISK AND MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH08167121A
公开(公告)日：1996-06-25
申请号：JP30724394
申请日：1994-12-12
申请人： HITACHI LTD
发明人： TANABE MASANORI , HONDA MASANOBU , OTANI YUICHI
IPC分类号： G11B5/39 , G11B5/84 , G11B19/04
摘要： PURPOSE: To provide an abnormal projection detecting method detecting an abnormal projection on a magnetic disk with the same sensitivity as a real small-sized head used for a magnetic disk device. CONSTITUTION: A magnetic head loading an element causing resistance change by contact heat, e.g. an MR element is arranged on the magnetic disk 1. A relative position between the magnetic head and the magnetic disk 1 is changed, and the resistance change of the element caused by the contact heat between the magnetic disk with the element of the magnetic head is detected, and a gain is amplified by a read amplifier 6, and is detected by a read control circuit 5 according to a prescribed level.

5. 发明专利

JPH0628628A MAGNETIC RECORDING/REPRODUCING DEVICE MOUNTING THIN FILM HEAD 失效
公开(公告)号：JPH0628628A
公开(公告)日：1994-02-04
申请号：JP18238092
申请日：1992-07-09
申请人： HITACHI LTD
发明人： TANABE MASANORI , NARUSHIGE SHINJI , SHIIKI KAZUO , SUDA MITSUO , TAKAGI MASAYUKI , SHIRAISHI KAZUHISA , AMANO HIDEAKI
IPC分类号： G11B5/00 , G11B5/012 , G11B5/31 , G11B5/39 , G11B5/65 , G11B5/82 , G11B5/74
摘要： PURPOSE:To provide the head of a high recording magnetic field gradient in a high recording magnetic field with the tip part of a magnetic core difficult to be saturated even when there is a variance in gap depths. CONSTITUTION:The magnetic gap length GL of a recording head (constituted of an upper part magnetic core 121 and a lower part magnetic core 122) is made wider than minimum magnetization bit length fc recorded on a magnetic recording medium 18. Thus, in both cases where a gap depth Gd is deep and shallow, an area where a magnetic saturation is first started when increasing a starting magnetic force is moved away from the tip part of the upper part core 121 to an inclined part and a head magnetic field Hmax and its gradient dHx/dx are heightened. Further, an MR head is used for a reproducing head, a normal bias current is supplied to an MR element only during reproducing data, a smaller bias current is supplied during reproducing the other ID signal and thus, the generation of heat is prevented.

6. 发明专利

JPH0475536B2 失效
公开(公告)号：JPH0475536B2
公开(公告)日：1992-12-01
申请号：JP15311884
申请日：1984-07-25
申请人： HITACHI LTD
发明人： SATO KAZUYA , YONEYAMA TAKAO , TANABE MASANORI , KAWAKAMI HIROJI
IPC分类号： G06F3/043 , G06F3/03 , G06K11/06

7. 发明专利

JPH03268214A THIN-FILM MAGNETIC HEAD CONTROLLED IN NOISE AFTER WRITING 失效
公开(公告)号：JPH03268214A
公开(公告)日：1991-11-28
申请号：JP6422690
申请日：1990-03-16
申请人： HITACHI LTD
发明人： SANO MASAAKI , MITSUOKA KATSUYA , NISHIOKA KOICHI , NARUSHIGE SHINJI , SUGITA KEN , TANABE MASANORI , FUKUI HIROSHI , KOBAYASHI TETSUO , YOSHIDA TOSHIHIRO , SAITO SUKEO , KAWAKAMI KANJI , TSUJI GIICHI , NAKAKOSHI KAZUO , HAYASHI MASAAKI
IPC分类号： G11B5/31
摘要： PURPOSE:To decrease the generation of pseudo noises and to prevent the error of a device by controlling the max. value of the noises after recording so as to attain

8. 发明专利

JPH0159525B2 失效
公开(公告)号：JPH0159525B2
公开(公告)日：1989-12-18
申请号：JP20466882
申请日：1982-11-24
申请人： HITACHI LTD
发明人： TANABE MASANORI , KAWAKAMI HIROJI
IPC分类号： G01D5/14 , G01D5/18 , G01L1/18 , G01L9/00 , G01L9/06 , G01N27/00 , G01N27/07 , G01N27/12 , G01N27/414 , H01L29/84
摘要： The drain voltage of an IG FET (T,) having a channel responsive to the change in physical quantity to be measured is negatively fed back to the gate terminal of the IG FET. The negative feedback loop includes series connection of a first amplifier (A,) having an amplification factor larger than unity and a second amplifier (N,) having an amplification factor smaller than unity. The interconnection point between the first and the second amplifiers is connected to the output terminal. There is provided a stable, highly sensitive and highly reliable semiconductor sensor.

9. 发明专利

JPH01201813A MAGNETIC RECORDING METHOD USING READOUT/WRITE SEPARATION TYPE THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JPH01201813A
公开(公告)日：1989-08-14
申请号：JP2369288
申请日：1988-02-05
申请人： HITACHI LTD
发明人： TANABE MASANORI , FUKUI HIROSHI , AIHARA MAKOTO , HANAZONO MASANOBU , KAWAKAMI HIROJI , SAITO MAKOTO
IPC分类号： G11B5/31 , G11B5/012 , G11B5/127 , G11B5/29 , G11B5/48
摘要： PURPOSE:To obtain a device having a fast access function by writing information to be written on a header field on a magnetic disk with a signal of long wavelength, and enabling the information to be read out by either a write head or a read head. CONSTITUTION:A magnetic head slider 1 is arranged on an arbitrary plane on a magnetic disk 3 with the spring constant of a load arm to mount the slider 1 and a floating interval decided by the rotating speed of the disk 3, etc. The write head 11 and the read head 12 are formed in parallel on the side plane of the slider 1 in a direction intersecting orthogonally to an information track formed on the disk 3, and they are formed integrally with a conductor 13 for drawing out an electrical signal. On the plane of the disk 3 corresponding to the positions of both heads 11 and 12 on the slider 1, corresponding information tracks A and B are formed by the access of the slider 1, respectively. Since the signal of the header field 41 can be read out by the write head 11, it is not required to read out the signal of the field 41 by the read head 12 at the time of writing new information on a data part 43, thereby, the fast access function of the device can be maintained.

10. 发明专利

JPS6419510A THIN FILM MAGNETIC HEAD 失效
公开(公告)号：JPS6419510A
公开(公告)日：1989-01-23
申请号：JP17466687
申请日：1987-07-15
申请人： HITACHI LTD
发明人： KAWAKAMI HIROJI , FUKUI HIROSHI , TANABE MASANORI , FUKUOKA HIROTSUGU , SUDA MITSUO , NARUSHIGE SHINJI , MITSUOKA KATSUYA , SAITO SUKEO , TSUJI GIICHI , KOBAYASHI TETSUO , TAKAGI MASAYUKI , YOSHIDA TOSHIHIRO
IPC分类号： G11B5/31
摘要： PURPOSE:To improve reading accuracy at the time of performing a high frequency operation, by constituting the magnetic pole plane of an upper magnetic core and a lower magnetic core with a single layer of magnetic film, and forming structure where a part positioned at the rear of the magnetic pole plane is laminated with plural magnetic films and non- magnetic insulating films alternately. CONSTITUTION:The lower magnetic core 20 is constituted of the magnetic films 1 and 2 and the non-magnetic insulating film 3, and the upper magnetic core 30 is constituted of the magnetic films 4 and 5 and the non-magnetic film 6. Both magnetic cores 20 and 30 form a prescribed magnetic gap 9 at the tip of the heads where they confront with a magnetic recording medium 100, and are connected magnetically at the rear part separated far from the magnetic gap, and a conductive coil 10 with prescribed number of winding which passes both cores 20 and 30 and crosses with a magnetic circuit is provided between the cores 20 and 30, and when a current flows on the coil 10, an intensified magnetic field is generated in the magnetic gap 9, and information can be recorded on the recording medium 100 by the magnetic field. When the medium 100 passes through in the neighborhood of the magnetic gap 9 at high speed, magnetic flux is generated which alternates from the upper core 20 to the lower core 30 in a short time, and a voltage is induced in the conductive coil 10 by the magnetic flux, then, the information can be reproduced on the medium 100.

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