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1. 发明专利

JPH04113515A MAGNETIC DISK 失效
公开(公告)号：JPH04113515A
公开(公告)日：1992-04-15
申请号：JP23069990
申请日：1990-09-03
申请人： HITACHI LTD
发明人： YAMAGUCHI NOBUYA
IPC分类号： G11B5/82 , G11B5/64 , G11B5/73
摘要： PURPOSE:To allow low-floating and to obtain a higher density by adopting the constitution in which the surface consists of projecting parts and recessed parts and that the occupying areas of the recessed parts are larger the nearer the outer periphery from the inner periphery of the magnetic disk. CONSTITUTION:The surface shape of the magnetic disk is constituted of the projecting parts and the recessed parts and the ratios of the areas of the recessed parts are set larger the nearer the outer periphery from the inner periphery. Namely, the head floating slide surface of a magnetic head is floated by the principle of a gas bearing as the disk rotates and, therefore, the disk surface largely receives the influence of the shape and roughness. The pressure on the floating slide surface of the magnetic head drops and the head floating quantity decreases when the ratios occupied by the recessed parts of the disk surface increase. The increase in the head floating quantity, i.e., the difference between the inner and outer peripheries of the head floating quantity is decreased by increasing the ratio of the recessed parts of the disk surfaces toward the outer periphery. Recording at the high density by the low floating of the head is possible in this way.

2. 发明专利

JPS6295717A MAGNETIC DISC MEDIUM 失效
公开(公告)号：JPS6295717A
公开(公告)日：1987-05-02
申请号：JP23513085
申请日：1985-10-23
申请人： HITACHI LTD
发明人： OTANI YUICHI , SASAZAKI TAKESHI , YAMAGUCHI NOBUYA
IPC分类号： G11B5/62 , G11B5/82
摘要： PURPOSE:To improve the adsorption between a magnetic disc medium and a magnetic head without lowering the sliding resistance characteristic by selecting the lubricant film thickness of a specific part of a contact start stop zone thinner than that of the other parts. CONSTITUTION:A disc 1 is driven while being fitted to a turning spindle 2 and a lubricant from a lubricant supply part 3 moved in a radial direction of the disc 1 or fixed thereto is adsorbed by the disc 1. A magnetic head stop part 5 is assumed to a part of the start top (CS.S) zone 4 of the disc 1 to provided to a mask 6. The ratio of the lubricant film thickness of the stop part 5 to the other parts is decided that the lubricant film thickness of the stop part 5 is decided at first from the permissible value not causing the adsorption depending on the relation between the adsorbing force and lubricant film thickness after for a long time and the lubricant film thickness of the parts other than the stop part from the relation between the slide resistance characteristic and the lubricant film thickness and between the characteristic with respective to the magnetic head floating and the lubricant film thickness. Then the part having a smaller lubricant film thickness than that of the other part is provided to a part of the zone 4 and the adsorption is improved without lowering the slide resistance characteristic.

3. 发明专利

JPS61238357A SPRAY COATING APPARATUS 失效
公开(公告)号：JPS61238357A
公开(公告)日：1986-10-23
申请号：JP7834385
申请日：1985-04-15
申请人： HITACHI LTD
发明人： YAMAGUCHI NOBUYA , OTANI YUICHI
IPC分类号： B05D1/02 , B05B12/12 , G11B5/84
摘要： PURPOSE:To form a stable and uniform coating film, by arranging a lubricant coating spray nozzle at a predetermined distance while arranging a plurality of temp. detectors and control parts in the vicinity of an object to be coated grasped from both surfaces thereof and performing the control of a spray state by the measurement of temp. CONSTITUTION:A magnetic disc 1 is grasped at the inner periphery thereof and rotated to the direction shown by an arrow A. Both surfaces of the magnetic disc are partially held between masks 3, 3 each having an opening part 3a in order to adjust a lubricant spray area and a spray nozzle 2 is arranged in opposed relation to the opening part 3a and sprays the lubricant diluted by a solvent to coat the surface of the magnetic disc 1. Thermocouples 4 are arranged at several places in the vicinity of the opening part 3a of the mask 3 and connected to a control part through an amplifier 5 for amplifying a signal to perform temp. measuring control. The output of the control part 6 is sent to a temp. recording part 7 for recording temp. detected by the thermocouples.

4. 发明专利

JPH0676273A MAGNETIC DISK AND PRODUCTION THEREOF 失效
公开(公告)号：JPH0676273A
公开(公告)日：1994-03-18
申请号：JP22859592
申请日：1992-08-27
申请人： HITACHI LTD
发明人： YAMAGUCHI NOBUYA , YAMADA KAZUO
IPC分类号： G11B5/72 , G11B5/725 , G11B5/82 , G11B5/84
摘要： PURPOSE:To ensure lubricity to a magnetic head and to prevent sticking. CONSTITUTION:In a magnetic disk with plural flat protrusions 11 and recesses 13 at the surface of a protective film 4 on a magnetic film 3, a bonding lubricant 6 bonded to the surface of the protective film 4 is applied to the protrusions 11 and a free lubricant 5 not bonded to the surface of the protective film 4 is applied to the recesses 13. The adsorbing power of the lubricant 6 and the protrusions 11 brought into contact with the slider of a magnetic head is relatively enhanced and sticking can be prevented. The bonding lubricant 6 bonded to the surface of the protective film 4 is applied to the protrusions 11 by activating only the surfaces of the protrusions 11 of the protective film 4 and carrying out lubricant application.

5. 发明专利

JPH01319128A MAGNETIC DISK 失效
公开(公告)号：JPH01319128A
公开(公告)日：1989-12-25
申请号：JP15027988
申请日：1988-06-20
申请人： HITACHI LTD
发明人： YAMAGUCHI NOBUYA
IPC分类号： G11B5/72 , G11B5/725 , G11B5/82
摘要： PURPOSE:To suppress the attraction of a head and a disk at the time when the disk stops and to improve dust resistance by providing a monomolecular film of a lubricating agent having surface bondability to a contact start-stop CSS zone and providing a lubricating film which is larger in amt. than in the CSS zone to the other data area. CONSTITUTION:A Cr lubricating agent film 2, a magnetic Co alloy film 3, and a protective C film 4 are formed by a sputtering method on an Ni-P plated substrate 1. The CSS area is completely coated with the lubricating agent of a bond type and the so-called monomolecular film having no excessive unbonded lubricating agent is formed thereon. The lubricating agent of the amt. larger than in the CSS area is coated in the other data area. Since the excess lubricating agent does not exist in this way, the attraction does not arise even if the head and the disk come into contact with each other over a long period of time. The smooth start is thus possible. Since a large amt. of the lubricating agent exists in the data area of the disk during the operation of the device, the disk having the excellent dust resistance is obtd.

6. 发明专利

JPS60135170A POLISHING METHOD OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS60135170A
公开(公告)日：1985-07-18
申请号：JP24393283
申请日：1983-12-26
申请人： HITACHI LTD
发明人： YAMAGUCHI NOBUYA , FUMIOKA JIYUN , IMAMURA MASAAKI
IPC分类号： B24B21/00 , B23D67/08 , B24B21/04 , G11B5/84
摘要： PURPOSE:To improve yield and the surface precision of a medium by using a polishing member provided with fine holes or fine grooves and quickly removing the polishing powder and separated abrasive grains. CONSTITUTION:A magnetic disk is polished by using a lapping tape 1 formed with fine holes 5 with a diameter of about 50mum and a depth of about 15mum at a rate of four holes/mm. on the surface formed with an abrasive grain layer 4 with a thickness of 17mum on a base film 2. That is, the magnetic disk 6 is rotated in the arrow A direction at a speed of about 400rpm with its inner periphery held, and the abrasive grain layer surface of a lapping tape 1 rewound in the arrow B direction at a speed of 5mm./sec from an unshown feed roll to an unshown rewinding roll is pressed to the surface of the magnetic disk 6 at 2kg/cm by a rubber roller 7. The polishing powder generated by polishing and separated abrasive grains escape in the fine holes 5 formed on the lapping tape 1, thereby the surface of the magnetic disk 6 is finished at high precision with little scratch.

7. 发明专利

JPH10326416A MAGNETIC DISK DEVICE, MAGNETIC RECORDING MEDIUM, AND MANUFACTURE OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH10326416A
公开(公告)日：1998-12-08
申请号：JP13472597
申请日：1997-05-26
申请人： HITACHI LTD
发明人： INOMATA YOICHI , TERAKADO MASAMICHI , AKAMATSU KIYOSHI , YAMAGUCHI NOBUYA , KATAOKA HIROYUKI , TANI KOUJI
IPC分类号： G11B5/82 , G11B5/65 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To provide a magnetic disk less in tackiness to a head and excellent in slide resistance and slide reliability, by providing prescribed projection parts on the data surface of the magnetic disk and providing the prescribed projection parts different from the data surface on a CSS zone. SOLUTION: The data surface is provided with many projection parts that have optional heights of 5-15 nm from a substantially flat reference surface, and the numeral value of (standard deviation of these heights)×3)) is within π30% of a projection part mean value, and a near-most projection part gap is controlled to

8. 发明专利

JPH1010097A DEVICE AND METHOD FOR INSPECTING LEVITATION PERFORMANCE OF MAGNETIC DISC 失效
公开(公告)号：JPH1010097A
公开(公告)日：1998-01-16
申请号：JP16272396
申请日：1996-06-24
申请人： HITACHI LTD
发明人： YONEKAWA TAKAO , SHODA MITSUHIRO , YAMAGUCHI NOBUYA , SAKAI MAKOTO
IPC分类号： G01N29/14 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To provide a disc levitation performance inspecting method for inspecting head levitation performance of a magnetic disc to determine whether or no it is defective. SOLUTION: An AE signal produced from an inspection head 1-2 is passed through an amplifier 1-3, a filter 1-4, and an envelope detector 1-5 and is waveform-generated. As one cycle of this waveform is converted from analog to digital form and sampled into a waveform processing device 1-9, a peak value histogram for an entire measuring range is calculated. Then a variety of numerical processes for extracting a parameter showing the shape of the histogram are performed to extract numerical values derived from projections, roughness, and waviness on a disk surface, so as to determine whether or not the disc is defective as to levitation performance.

9. 发明专利

JPH08306038A MAGNETIC DISK, ITS MANUFACTURE AND MAGNETIC DISK DEVICE ASSEMBLING METHOD 失效
公开(公告)号：JPH08306038A
公开(公告)日：1996-11-22
申请号：JP10891495
申请日：1995-05-08
申请人： HITACHI LTD
发明人： FURUSAWA KENJI , YAMAGUCHI NOBUYA , HAGIMAE HIROAKI , OTAKE MITSUYOSHI , KATO AKIRA , ISHIHARA HEIGO
IPC分类号： G11B5/72 , G11B5/82
摘要： PURPOSE: To provide a magnetic disk of high recording density capable of preventing adhesion of a magnetic disk and reducing tangential force when a magnetic disk device is assembled. CONSTITUTION: This magnetic disk is provided with a data zone 102 provided with a magnetic film 107 and a carbon protection film 108 on a substrate, and for recording/reproducing information by a magnetic head, a CSS zone 101 for performing contact start/stop and a transfer zone 103 with a surface coarser than the data zone. When the magnetic disk device is assembled, the magnetic head is loaded from an outer peripheral end to be stopped to the transfer zone 103, and after the magnetic disk device is assembled, the magnetic head is floated by contact start, and is moved onto the CSS zone to be contact stopped and stopped.

10. 发明专利

JPS63209025A MAGNETIC DISK MEDIUM 失效
公开(公告)号：JPS63209025A
公开(公告)日：1988-08-30
申请号：JP4021587
申请日：1987-02-25
申请人： HITACHI LTD
发明人： SUGAWARA SHUICHI , YAMAGUCHI NOBUYA , ONO SADANOBU
IPC分类号： G11B5/72 , C09D171/02 , G11B5/725 , G11B5/82
摘要： PURPOSE:To prevent the attraction of a magnetic head and to improve the durability of a magnetic disk by using a lubricating agent which is good in attraction resistance in a CSS zone and using a lubricating agent which is good in volatility resistance in other parts. CONSTITUTION:Perfluoroalkyl polyether having the good attraction resistance is diluted to 5wt.% by trichlorofluoroethane in a lubricating agent supplying unit 1. Perfluoropolyether having low volatility is similarly diluted in a lubricating agent supplying unit 2. These lubricating agents are coated from a lubricating agent supplying part 5 toward a rotating disk 8. The part of the disk except the CSS (contact start stop) zone is covered by a mask 3 and the CSS zone is covered by a mask 4. The attraction of the magnetic head to the magnetic disk is thereby prevented while the sliding resistance of the magnetic disk is maintained and, therefore, the durability of the magnetic disk is improved.

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