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11. 发明专利

JP2000260015A MAGNETIC DISK DEVICE AND MANUFACTURE THEREOF 失效
公开(公告)号：JP2000260015A
公开(公告)日：2000-09-22
申请号：JP5662499
申请日：1999-03-04
申请人： HITACHI LTD
发明人： TOKISUE HIROMITSU , TOKUYAMA MIKIO , TSUCHIYAMA RYUJI , MATSUNO JUNICHI
IPC分类号： G11B5/72 , G11B5/60 , G11B5/725 , G11B5/82 , G11B21/21
摘要： PROBLEM TO BE SOLVED: To provide a slider-mounted magnetic disk device capable of reducing the wearing speed of a projection provided on the floating upper surface of a slider, realizing a projection height equal to about 10 nm or smaller necessary for a future slider, and bringing a magnetic head provided in the slider and smooth magnetic disk surface close to each other with a gap reduced to nearly zero therebetween. SOLUTION: In the floating upper surface of a slider 2, a region having a roughness consisting of very small projection parts is formed on the surface of the floating upper surface, the diameter or the width of the top part of each of these very small projection parts measured in a slider traveling direction is set roughly equal to 1 μm or lower, the total are of the top parts of all the very small projection parts is equal to 0.02 mm2 or lower, a lubricant layer 11 is formed on the surface of a magnetic disk 1, and the thickness of the lubricant layer 11 and the surface roughness of the magnetic disk are smaller than the protruding amount of a rough portion formed in the slider 2 from a rail surface.

12. 发明专利

JPH09326109A MAGNETIC HEAD AND MAGNETIC DISK STORAGE UNIT 失效
公开(公告)号：JPH09326109A
公开(公告)日：1997-12-16
申请号：JP14256296
申请日：1996-06-05
申请人： HITACHI LTD
发明人： KAWAKUBO YOICHI , TSUCHIYAMA RYUJI , ISHII MIEKO
IPC分类号： G11B5/60 , G11B21/21
摘要： PROBLEM TO BE SOLVED: To reduce the amount of dust entering from the front edge and to increase the operating reliability of a storage unit by making the distance of the surface of a land part confronted with the magnetic disk against the magnetic disk shorter than that of the upstream side of rotation of an element part. SOLUTION: On the surface of the magnetic head 20 confronted with the magnetic disk, two tapered flat floating surfaces having entirely the same shapes are provided at the inner and outer peripheral sides. On each flow-out side surface of the confronted surface, magnetic materials 30 of the thin film magnetic head are formed and one of them is actually used for the information recording and reproducing operations. The space for the front edge of the tapered parts 26 of the head 20 against the magnetic disk is approximately 4μm, meanwhile, the space to the land parts 130 on the magnetic head is 0.1μm. Therefore, only the dust passing through the part of space 0.1μm against the magnetic disk is caught by the tapered parts 26.

13. 发明专利

JPH06338004A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH06338004A
公开(公告)日：1994-12-06
申请号：JP12870193
申请日：1993-05-31
申请人： HITACHI LTD
发明人： KOIZUMI MAKOTO , TSUYOSHI TOSHIAKI , SATO NAOKI , KOYAMA NAOKI , SASAKI SHINOBU , TSUCHIYAMA RYUJI
IPC分类号： G11B5/02
摘要： PURPOSE:To prevent data in a magnetic disk device from being erased by detecting three typical phenomena generated when a magnetic film constituting an MR reproducing head is touched and damaged, at the time of reproducing the MR head, and recognizing a deterioration of the head. CONSTITUTION:When the deterioration of head is detected by an incorporated microcomputer, the interruption is made by the incorporated microcomputer 12 to interrupt the communication with a host device 2 and to make the state busy, then a data maintenance work is controlled. The frequency of access to the host device 2 is monitored by the incorporated microcomputer 12, and the interruption is made when the frequency is extremely low, then the information of the remainder of the deteriorated head surface is all recorded on an alternate track on a separate head surface. After that, the alternated address is recorded on a nonvolatile storage element 30, then the data maintenance work is completed.

14. 发明专利

JPH04368623A MAGNETIC RECORDING MEDIUM AND MANUFACTURE OF THE SAME AND MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH04368623A
公开(公告)日：1992-12-21
申请号：JP14578791
申请日：1991-06-18
申请人： HITACHI LTD
发明人： TSUCHIYAMA RYUJI
IPC分类号： G11B5/72 , G11B5/725 , G11B5/73 , G11B5/82 , G11B5/84
摘要： PURPOSE:To reduce the damage of a magnetic recording medium without deteriorating of electric characteristics of the medium. CONSTITUTION:A ferromagnetic film 2 is formed on a base board 3 having excellent in flexibility and a hole 6 penetrating through two layers is provided on a non-magnetic area or an area other than the area where recording signal is written. The base board 3 excellent in flexibility and high rigidity base board 4 are formed in the laminating structure, and a gap 5 between both layers is filled with lubricant 7. Since collision force is relaxed and a lubricant is supplied through holes, the magnetic recording medium and the magnetic disk device having high recording density and high reliability are presented.

15. 发明专利

JPH04186573A MAGNETIC HEAD SLIDER AND MAGNETIC DISK APPARATUS USING THE SAME 失效
公开(公告)号：JPH04186573A
公开(公告)日：1992-07-03
申请号：JP31401590
申请日：1990-11-21
申请人： HITACHI LTD
发明人： TSUCHIYAMA RYUJI
IPC分类号： G11B21/21
摘要： PURPOSE:To obtain an efficient slider by forming a flat surface inclined laterally of rails at least at parts of the rails provided at a magnetic head slider in such a manner that the inclined surface is directed rightward or leftward with respect to a center line along the rail. CONSTITUTION:Rails 2a, 2b are provided on a magnetic head slider 1, and composed of air bearing surfaces 3a, 3b inclined longitudinally of the rails, air bearing surfaces 4a, 4b inclined laterally of the rails, and flat surfaces 5a, 6a, 5b, 6b to become air bearing surfaces. Accordingly, a spacing can be microscopically reduced without increasing a pressing load and without reducing the width of the slider. Since a recording density can be enhanced and a contact area with the surface of a magnetic recording medium can be reduced, adherence can be prevented.

16. 发明专利

JPH01155516A PRODUCTION OF MAGNETIC DISK 失效
公开(公告)号：JPH01155516A
公开(公告)日：1989-06-19
申请号：JP31192987
申请日：1987-12-11
申请人： HITACHI LTD
发明人： AKAGI KYO , TSUCHIYAMA RYUJI
IPC分类号： G11B5/84
摘要： PURPOSE:To completely remove microprojections in a short period of time from a magnetic disk surface without damaging said surface by oscillating a varnishing head and load spring system at the resonance frequency of the system by means of a shaker and subjecting the same to seeking in the radial direction of the head. CONSTITUTION:The load spring 2 is fastened to a guide stage 3a. The guide stage 3a is connected to the shaker 4 via an excitation rod 3b. The shaker 4 is fixed onto a moving base 5 movable in the radial direction of the magnetic disk 8. The spring system resonates and the head 1 oscillates when a supporting spring mounting part 3a for supporting the floating head 1 which floats on the rotating magnetic disk 8 is oscillated finely in a vertical direction at the intrinsic frequency of the bending in the vertical direction of the supporting spring 2. Since the head gliding surface is thereby brought into collision against the peak parts of the projections at the frequency conforming to the resonance frequency of the spring system, the projections are efficiently removed.

17. 发明专利

JPS6417276A MAGNETIC HEAD SUPPORTING BODY 失效
公开(公告)号：JPS6417276A
公开(公告)日：1989-01-20
申请号：JP17095287
申请日：1987-07-10
申请人： HITACHI LTD
发明人： TSUCHIYAMA RYUJI
IPC分类号： G11B21/21
摘要： PURPOSE:To prevent the vibration of a load spring from being transmitted to a head by constituting load working points of the load spring and a pivot part of a gimbal in combination with a permanent magnet and a superconductive material and keeping both of them in non-contact. CONSTITUTION:The gimbal 2 for combining the magnetic head 1 and load spring 3 is stuck with only a part 2a as one part of the gimbal 2 onto the magnetic head 1, while a head arm 4 is fixed to the load spring 3 with a screw. In case of giving a load to the magnetic head 1 by the load spring 3, the total load is imposed on a part 3a of the load spring 3 and then transmitted to a part 2b of the gimbal 2. These load working points 3a and 2b are the combination of the permanent magnet and the superconductive material. By this method, the load working points can be brought into non-contact by Meissner effect which is characteristic of the superconductive material, thus preventing the vibration of the load spring from transmitted.

18. 发明专利

JPS6329320A PRODUCTION OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6329320A
公开(公告)日：1988-02-08
申请号：JP17153086
申请日：1986-07-23
申请人： HITACHI LTD
发明人： KAWAMURA YOSHIO , KATO SHIGEO , IMAMURA MASAAKI , OTANI YUICHI , ITO YASUSHI , TSUCHIYAMA RYUJI , SUZUKI SHOJI , MAEHARA KIYOSHI
IPC分类号： G11B5/72 , C09D5/23 , C09D7/12 , G11B5/73 , G11B5/84
摘要： PURPOSE:To improve head crash resistance and non-tackiness by forming a mask material having a pattern of a prescribed shape in a prescribed position to the surface of a magnetic recording medium, sticking a hard and rigid material thereon and fixing the head and rigid material having the prescribed shape and thickness to the prescribed position after removal of the mask material. CONSTITUTION:The magnetic recording medium 2 formed by kneading a magnetic material such as iron oxide with a resin is coated on the surface of a substrate 1 consisting of an Al alloy. A sensitizing agent 4 is coated on the surface of the magnetic recording medium 2 and the pattern sized 0.5mphi is exposed to the prescribed position by using a reduction projecting exposing device, then the agent is developed to form the mask having microholes 7. The hard and rigid material 3 such as alumina or SiC is deposited therein by sputtering. The magnetic recording disk consisting of the magnetic recording medium 2 having the hard and rigid material on the surface is obtd. when the sensitizing agent 4 playing the role of the mask is finally removed by a solvent. The height of the hard and rigid material can be varied by controlling the rate of vapor deposition at the time of the vapor deposition by sputtering. Both the improvement of the head crash resistance and non-tackiness of the magnetic recording medium and the improvement of the magnetic recording density are thereby satisfied.

19. 发明专利

JP2004234743A Magnetic head slider and magnetic disk device 有权
公开(公告)号：JP2004234743A
公开(公告)日：2004-08-19
申请号：JP2003021292
申请日：2003-01-30
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： TSUCHIYAMA RYUJI , TANI KOUJI , TOKUYAMA MIKIO , KODAIRA HIDEKAZU , KURITA MASAYUKI , SHODA MITSUHIRO , JO KINKOKU , MATSUMOTO MASAAKI
IPC分类号： G11B5/60 , G11B21/21
CPC分类号： G11B5/6005
摘要： PROBLEM TO BE SOLVED: To simultaneously reduce vibration caused by the contact between a flat and smooth medium surface and a slider and fluctuation in the amount of floating caused by undulation of the medium surface and pressure change in the vicinity of the slider.
SOLUTION: Inflow pads 11 of a magnetic head slider are more protruded in the thickness direction of a slider 1 than an outflow pad 12, thereby obtaining the magnetic head slider and the magnetic disk device which are excellent to be made high in recording density, high in reliability and low in cost.
COPYRIGHT: (C)2004,JPO&NCIPI

20. 发明专利

JP2004110942A Magnetic disk device 审中-公开
公开(公告)号：JP2004110942A
公开(公告)日：2004-04-08
申请号：JP2002272440
申请日：2002-09-19
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： ODAI MASAKI , AKAGI KYO , TSUCHIYAMA RYUJI
IPC分类号： G11B21/21 , G11B5/55 , G11B19/00 , G11B19/02 , G11B19/22 , G11B19/26 , G11B19/28 , G11B21/12 , G11B25/04
CPC分类号： G11B5/5521 , G11B19/02 , G11B19/26 , G11B25/043
摘要： PROBLEM TO BE SOLVED: To provide a magnetic disk device in which a time required for stating a device from a state of a power saving mode is short and operation can be performed by small power.
SOLUTION: A slow revolution mode in which the number of revolution of a disk 101 is reduced is provided, and the slow revolution mode is achieved by inertia drive and acceleration by an open loop.
COPYRIGHT: (C)2004,JPO

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