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公开(公告)号：BR9102008A
公开(公告)日：1991-12-24
申请号：BR9102008
申请日：1991-05-16
Applicant: IBM
Inventor： MATSUI TAKAO , SONOBE YOSHIAKI
Abstract: Described is a magnetic disk apparatus including at least one magnetic disk 1 comprising a glass or ceramic substrate. Magnetic heads (3a, 3b) are arranged on opposite surfaces of the disk and are shifted with respect to one another in a radial direction. This shifting reduces the amount of crosstalk and signal deterioration caused by the electromagnetic coupling of the two heads.
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公开(公告)号：CA2042871A1
公开(公告)日：1991-11-29
申请号：CA2042871
申请日：1991-05-17
Applicant: IBM
Inventor： MATSUI TAKAO , SONOBE YOSHIAKI
Abstract: JA9-89-018 A MAGNETIC DISK APPARATUS The disclosure deals with magnetic disk apparatus and the reduction of crosstalk and output signal attenuation by the expedient of shifting the positions of the top and bottom magnetic heads. Crosstalk noise is caused by the electromagnetic coupling of the top and bottom heads across a disk. Depending upon signal attenuation and crosstalk ratios, the respective heads are shifted, resulting in a sharp reduction in both attenuation and crosstalk.
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公开(公告)号：JPH09298114A
公开(公告)日：1997-11-18
申请号：JP646397
申请日：1997-01-17
Applicant: IBM JAPAN
Inventor： SONOBE YOSHIAKI , IKEDA YOSHIHIRO , UCHIDA HIROSHI , TOYOOKA TAKASHI , TAGASHIRA KAKO
Abstract: PROBLEM TO BE SOLVED: To obtain a good vertical magnetic interaction as one of the characteristics of a vertical magnetic recording medium by a method wherein the composition of a vertical magnetizing film contains Co and Cr, the amount of the Cr is set in the extent of a specified atomic % of higher to a specified atomic % or lower and the vertical magnetizing film is magnetized in the vertical direction to the film surface of the magnetizing film. SOLUTION: A vertical magnetizing film 12 is formed on a glass substrate 10 as a recording layer via a base layer 11 consisting of a Ti layer. The composition of the film 12 contains Co and Cr, the amount of the Cr is contained more than 22 atomic % and is contained within the extent of 30 atomic % of lower and the film 12 is made to magnetize in the vertical direction to the film surface of the film 12. Thereby, a good vertical magnetic interaction can be obtained as one of the characteristics of a vertical magnetic recording medium and though the output of a magnetic recording device is reduced in the extent that the amount of the Cr is 22 atomic % or higher to 30 atomic % or lower, the device can obtain a good S/N ratio.
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公开(公告)号：JPH0432001A
公开(公告)日：1992-02-04
申请号：JP13550690
申请日：1990-05-28
Applicant: IBM
Inventor： MATSUI TAKAO , SONOBE YOSHIAKI
Abstract: PURPOSE: To reduce the crosstalk noise and the deterioration of signal output by arranging to shift the position of a pair of upper/lower magnetic disks holding a glass substrate magnetic disk therebetween. CONSTITUTION: The substrate of the magnetic disk 1 consists of glass, and the magnetic layers are vapor-deposited on the upper surface and lower surface sides of this substrate. The 1st magnetic head 2a is arranged on the upper surface side of this magnetic disk 1 and supported by a 1st slider 3a. Also, the 2nd magnetic head 2b is arranged on the lower surface side of the magnetic disk 1 and supported by a 2nd slider 3b. Then, the 1st magnetic head 2a and the 2nd magnetic head 2b are arranged so that the recording tracks are shifted by (d). By this arrangement, the attenuation amount of signal output and the crosstalk noise are remarkably reduced without forming a shield layer on the substrate of the magnetic disk 1.
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公开(公告)号：JPH087203A
公开(公告)日：1996-01-12
申请号：JP13983794
申请日：1994-06-22
Applicant: IBM
Inventor： SONOBE YOSHIAKI , UCHIDA HIROSHI , TOYOOKA TAKASHI , MATSUI TAKAO , AOKI TATSUJI , IIHARA YASUHIRO , TSUCHIMOTO KAZUNARI , OZAWA YUTAKA
Abstract: PURPOSE: To enhance easily the stability of a magnetic domain of a MR head without carrying out complicated works such as disassembling and assembling etc. and reproduce data. CONSTITUTION: A drive device 28 is driven corresponding to a signal output from a controller body 40 of a HDC 30, and it records and reproduces data in a location where an access arm is pivoted at a specific angle. When data for this disk are recorded and reproduced, a bias current supplied to a reproduction element 21A of a magnetic head 20A having a MR effect is turned on/off only for a specific period by a reproduction control circuit 32A. Accordingly, as a direction of a magnetizing vector is changed within a specific period, a magnetic domain of the reproduction element 21A (MR element) is not unstable, but stabilized so that data from the disk can be reproduced stably.
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Patent Agency Ranking
公开(公告)号：JPH0636274A
公开(公告)日：1994-02-10
申请号：JP17264992
申请日：1992-06-30
Applicant: IBM
Inventor： KANAMARU MASAYUKI , KITAZAKI NOBUYUKI , SONOBE YOSHIAKI
Abstract: PURPOSE: To prevent the disk surface from deteriorating due to its contact with a head by making at least a start-stop region an inclined surface inclined to the side of its back surface in accordance with the radial direction from the inner side to the outer side. CONSTITUTION: The start-stop region 1A of the head is formed on the inner circumferential side of the surface of the disk 1, and a data storage region 1B is formed on the outer circumferential side of the region 1A. The surface of this disk 1 is made to be a truncated conical surface at a prescribed slope angle θ1 from the inner circumferential side toward the outer side over the whole range including the region 1A and the region 1B. Such a disk 1 is used to be set up in a linear actuator type hard disk device or a rotary actuator type hard disk device. By forming this shape, the head positioned in the region 1A can be given an apparent crown, and as a result, the head can quickly be floated up above the region 1A at the starting time of rotating the disk.
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公开(公告)号：CZ283110B6
公开(公告)日：1998-01-14
申请号：CS159491
申请日：1991-05-28
Applicant: IBM
Inventor： MATSUI TAKAO , SONOBE YOSHIAKI
Abstract: Described is a magnetic disk apparatus including at least one magnetic disk 1 comprising a glass or ceramic substrate. Magnetic heads (3a, 3b) are arranged on opposite surfaces of the disk and are shifted with respect to one another in a radial direction. This shifting reduces the amount of crosstalk and signal deterioration caused by the electromagnetic coupling of the two heads.
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公开(公告)号：HUT60059A
公开(公告)日：1992-07-28
申请号：HU177291
申请日：1991-05-27
Applicant: IBM
Inventor： MATSUI TAKAO , SONOBE YOSHIAKI
Abstract: Described is a magnetic disk apparatus including at least one magnetic disk 1 comprising a glass or ceramic substrate. Magnetic heads (3a, 3b) are arranged on opposite surfaces of the disk and are shifted with respect to one another in a radial direction. This shifting reduces the amount of crosstalk and signal deterioration caused by the electromagnetic coupling of the two heads.
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公开(公告)号：CS9101594A3
公开(公告)日：1992-02-19
申请号：CS159491
申请日：1991-05-28
Applicant: IBM
Inventor： MATSUI TAKAO , SONOBE YOSHIAKI
CPC classification number: G11B5/4886 , G11B5/718 , G11B5/7305
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公开(公告)号：JP2001126229A
公开(公告)日：2001-05-11
申请号：JP2000321475
申请日：2000-10-20
Applicant: IBM JAPAN
Inventor： SONOBE YOSHIAKI , IKEDA YOSHIHIRO , UCHIDA HIROSHI , TOYOOKA TAKASHI , TAGASHIRA KAKO
Abstract: PROBLEM TO BE SOLVED: To provide a perpendicular recording medium suitable for using a head utilizing a magneto resistance effect as a reproducing head. SOLUTION: A perpendicular magnetic recording medium having a laminated structure including plural recording layers is characterized in that at least one layer of the recording layers is a perpendicularly magnetized film layer having a composition expressed by the formula (Co100-xCrx)100-yPty wherein x and y are in the range of 27
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