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1. 发明专利

JPH11191216A MAGNETIC DISK AND SUBSTRATE THEREFOR 失效
公开(公告)号：JPH11191216A
公开(公告)日：1999-07-13
申请号：JP29640598
申请日：1998-10-19
申请人： HITACHI LTD
发明人： TANAKA HIDEAKI , GOMI KENICHI , SAWAHATA SHOICHI , KONDOU MAKI , OURA MASAKI , MIYAKE YOSHIHIKO , KATO YOSHIKI , OKUWAKI TOYOJI , OKAMOTO NORIAKI , NAKAGAWA YOSHIO
IPC分类号： G11B5/72 , G11B5/73 , G11B5/82
摘要： PROBLEM TO BE SOLVED: To maintain floating stability of a magnetic head over a long period by arranging a lot of projecting parts having about a constant height on a disk surface to be helical centering the center of the disk, and making the deviated amount in the radial direction between those projecting parts, which are helically arranged and successively adjacent to each other, to the radial width of the projecting part or less. SOLUTION: Linear or pit-formed projecting parts 7, consisting of parts of circular arcs of concentric circles or helical circles centering the center of rotation of a magnetic disk 14, are arranged regularly. A part of non- projected part is arranged so as to be smoothly successive from the internal circumference to the external circumference of the magnetic disk 14 within a moving area of a magnetic head. Thus, when the magnetic disk 14 is rotated by putting a slider on the magnetic disk 14, the projecting parts 7 are faced to the whole surface of the slider while they are successively slipping off to the side of the external circumference, so dusts adhered to the slider can be removed therefrom and can further be removed off the side of the external circumference through the non-projecting parts 7 by a centrifugal force.

2. 发明专利

JPH05303735A 失效
公开(公告)号：JPH05303735A
公开(公告)日：1993-11-16
申请号：JP10796892
申请日：1992-04-27
申请人： HITACHI LTD
发明人： NAKAMURA TAKAO , SEKIYAMA SHINYA , MASUDA MASAMI , KATO YOSHIKI
IPC分类号： G11B5/02 , G11B5/64 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/84
摘要： PURPOSE:To provide the magnetic disk device making a small floating and corresponding to the high-density recording and the magnetic recording device. CONSTITUTION:The magnetic disk substrate having small surface roughness (less than 1nmRmax) and high flatness (less than 1mum) is used. To obtain such substrate, the both-side grinding is performed while keeping the elasticity deformation of a substrate 3 within the constant range by monitoring the position deviation of an upper panel 4 by means of a position deviation sensor 13. Thereby eliminating the warp of the substrate 3 and improving the flatness. The substrate 3 is placed between the upper and lower panels 4 and 5 with a surface generating the dynamic pressure. With the dynamic pressure effect of the abrasive material between the panels 4, 5 and the substrate 3, the both-side grinding of the substrate 3 is performed in a non-contact state to reduce the surface roughness.

3. 发明专利

JPH0592363A DUPLEX SIMULTANEOUS POLISHING METHOD FOR BASE AND ITS DEVICE, POLISHING METHOD FOR MAGNETIC DISC BASE USING ABOVE DEVICE AND MANUFACTURE OF MAGNETIC DISC AND MAGNETIC DISC 失效
公开(公告)号：JPH0592363A
公开(公告)日：1993-04-16
申请号：JP2635191
申请日：1991-02-20
申请人： HITACHI LTD
发明人： NAKAMURA TAKAO , SEKIYAMA SHINYA , KAWAI TSUNEO , KATO YOSHIKI
IPC分类号： B24B37/00 , B24B37/015 , B24B37/04 , B24B37/08 , B24B49/14 , B24B57/02 , G11B5/84 , G11B23/50
摘要： PURPOSE:To provide a polishing method and device to realize duplex simultaneous float polishing by which both faces of a base can be simultaneously polished under the condition of no contact with a surface plate. CONSTITUTION:A thin plate 3 such as a base for a magnetic disc is rotatably loaded in the hole of a carrier 8 provided between upper and lower surface plates 4, 5 forming a dynamic pressure generating face in a thermally controlled polishing liquid. When the number of revolutions of the surface plates increase, the dynamic pressure effect of a polishing agent lying between the surfaces of the surface plate and of the base is generated there, and the base is polished under the condition of no contact with the surface plate. The surface of the base is polished by fine isolated abrasive grains in the polishing liquid flowing between the surface plate and base to obtain excellent flatness to which the surface accuracy of the surface plate is transcribed. This polishing method makes the best use of the characteristic of float polishing, and is especially suitable for the surface polishing of a thin plate such as a magnetic disc base in which residual machining strain is undesirable, and can therefore realize the magnetic disc having excellent surface condition.

4. 发明专利

JPH0485725A MAGNETIC DISK DEVICE AND MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH0485725A
公开(公告)日：1992-03-18
申请号：JP19795290
申请日：1990-07-27
申请人： HITACHI LTD
发明人： GOMI KENICHI , TANAKA HIDEAKI , SUGIMOTO HIROYUKI , SAWAHATA SHOICHI , OURA MASAKI , MIYAKE YOSHIHIKO , KATO YOSHIKI
IPC分类号： G11B5/82 , G11B5/64 , G11B5/73 , G11B5/738
摘要： PURPOSE:To prevent the modulation of an electrical output and to stably maintain floating even if the floating quantity of a magnetic head is decreased by orienting a magnetic layer in a circumferential direction. CONSTITUTION:Only the hill part directly faces the head and the area ratio of the magnetic recording medium in contact with a head can be decreased and, therefore, the friction force and attraction force to the head are lowered. In addition, the fluctuation in the floating quantity of the head is decreased if the formed hills are regularly disposed. The stability of the floating of the head is assured over the entire surface of the magnetic recording medium and the fluctuation in the output by the fluctuation in the floating quantity is prevented. Further, the microgrooves formed along the circumferential direction in the hill and groove parts contribute to the shape magnetic anisotropy of the magnetic layer. The coercive force in the circumferential direction with respect to a radial direction and the squareness ratio are large and the fluctuation in the output by the modulation is lessened.

5. 发明专利

JPH02284966A PRODUCTION OF MAGNETIC COATING 失效
公开(公告)号：JPH02284966A
公开(公告)日：1990-11-22
申请号：JP10592089
申请日：1989-04-27
申请人： HITACHI LTD
发明人： TAKASAGO HIDEKAZU , KATO YOSHIKI , IMAMURA MASAAKI
IPC分类号： C09D5/23 , G11B5/842
摘要： PURPOSE:To obtain a magnetic coating capable of providing an uniform coating film having excellent characteristics to a magnetic recording medium by dispersing pulverized magnetic powder having large specific surface area into a resin at a specific ratio. CONSTITUTION:For example, (B) an epoxy resin is blended with (A) magnetic powder having >=38m /g BET value (specific surface area) at a resin amount of >=0.004g based on 1m total surface area of the component A and the blend is subjected to first kneading using a kneader, etc., in 10-400kg/cm shearing stress. Then (C) as necessary a resin and (D) solvent are added thereto and the blend is subjected to second kneading in shearing stress smaller than the above-mentioned shearing stress to provide the aimed magnetic coating.

6. 发明专利

JPH02168402A MAGNETIC RECORDING DEVICE 失效
公开(公告)号：JPH02168402A
公开(公告)日：1990-06-28
申请号：JP23996589
申请日：1989-09-18
申请人： HITACHI LTD
发明人： MIYAKE YOSHIHIKO , KAZAMA TOSHINORI , HONDA MASANOBU , KATAOKA HIROSHI , IMAMURA MASAAKI , NAKAKOSHI KAZUO , SAIKI NORIYUKI , YONEKAWA SUNAO , OTANI YUICHI , ITO YASUSHI , KATO YOSHIKI , HAYASHI MASAAKI
IPC分类号： G11B5/708 , C09D5/23 , C09D7/12 , G11B5/02
摘要： PURPOSE:To prevent wear of a magnetic disk by specifying the Knoop hardness of nonmagnetic particles mixed in a recording layer of a magnetic recording medium selected larger than that of a material used for a slider of the magnetic head. CONSTITUTION:A magnetic recording layer 20 is formed on a base 4 of a disk, and the recording layer 20 is formed by mixing nonmagnetic particles 1 and magnetic particles 2 into a resin 3. As the magnetic particles 2, for example, Fe2O3 is used, the nonmagnetic particles 1 act like a reinforcement member, and an artificial diamond is preferred. The resin 3 is, e.g., and epoxy resin and the nonmagnetic particles 1 and the magnetic particles 2 act like a binder to be coupled with the base 4. The Knoop hardness of a diamond is more than 3000, e.g., nearly 8000, and harder by a multiple of nearly 3.6 times than the hardness of nearly 2200 of a mixture comprising Al2O3 and titanium carbide used for the magnetic head. The hardness of the nonmagnetic particles 1 is increased relatively more than the hardness of a slider member of the magnetic head in this way to prevent wear of the magnetic disk.

7. 发明专利

JPS6462817A METHOD AND DEVICE FOR PRODUCING MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6462817A
公开(公告)日：1989-03-09
申请号：JP21781587
申请日：1987-09-02
申请人： HITACHI LTD
发明人： OGAWA OSAMU , FUMIOKA JIYUN , KATO YOSHIKI , KAWAKUBO YOICHI , KAWAMURA YOSHIO
IPC分类号： G11B5/84
摘要： PURPOSE:To form a recording medium having high-accuracy film thickness tolerance and good smoothness by providing grasping means which grasps a grinding tape with prescribed force into a grinding tape traveling path before grinding and subjecting the grinding tape to a calendering treatment. CONSTITUTION:The grinding tape 4 is delivered by clamping roller units 2 and, therefore, the grinding of a magnetic disk 1 is executed always at a stable traveling speed under the specified tension on a rubber roller 5 which is a pressing member even if there is a fluctuation in the tension state by a change in the winding torque or winding diameter of the tape 4 on a feed reel 8. Furthermore, the calendering treatment of the tape 4 is executed by the clamping roller units 2 and, therefore, the grinding surface of the tape 4 is maintained in the specified abrasive grain state and the specified grinding characteristic is maintained. The thickness of the magnetic film is thus obtd. with high accuracy and the good finish surface having less ruggedness is formed.

8. 发明专利

JPS634421A PRODUCTION OF MAGNETIC DISK 失效
公开(公告)号：JPS634421A
公开(公告)日：1988-01-09
申请号：JP14707086
申请日：1986-06-25
申请人： HITACHI LTD
发明人： IECHIKA KEIGO , ITO YASUSHI , KATO YOSHIKI , FUMIOKA JIYUN , MAEDA FUJIO
IPC分类号： B24B37/00 , G11B5/84
摘要： PURPOSE:To control and project high-hardness fine inorg. particulate powder to a desired height from a magnetic coated film contg. the high-hardness fine inorg. particulate powder coated on a substrate by grinding the coated film by using abrasive grains which are lower in hardness than the high-hardenss fine inorg. particulate powder and higher in hardness than the magnetic coated film. CONSTITUTION:Grinding fluid supply nozzles 1a, 1b are provided above the point where wrapping tapes 2a, 2b are held pressed to a magnetic disk 4 and the grinding fluid is kept supplied therefrom. The tapes 2a, 2b are respectively fed in the directions of arrows B, C so that always the fresh surface contact the magnetic disk 4. The high-hardness fine inorg. particulate powder 5 is incorporated into the magnetic coated film 6 on the magnetic disk substrate 4. The dislodgment of the high-hardness fine inorg. particulate powder 5 is low in the coated film state obtd. by the working; in addition, the projection height is stably obtd. up to the desired height. Alumina grains are used as, for example, the high-hardness fine inorg. particulate powder 5 and chromium oxide grains are used as the abrasive grains.

9. 发明专利

JPS6280827A MAGNETIC DISC 失效
公开(公告)号：JPS6280827A
公开(公告)日：1987-04-14
申请号：JP22004385
申请日：1985-10-04
申请人： HITACHI LTD
发明人： SAKAGUCHI ISAO , KAWADE TATSUO , IMAMURA MASAAKI , KATO YOSHIKI , MAEDA FUJIO , HAYASHI MASAAKI
IPC分类号： G11B5/62 , C09D5/23 , C09D127/04 , C09D127/06 , C09D161/04 , C09D161/06 , G11B5/708 , G11B5/73 , G11B5/82
摘要： PURPOSE:To improve the electric characteristic by providing a groove to a coating film formed by applying a magnetic paint and providing a reinforcement member to the groove so as to improve the coating film intensity of the magnetic disc. CONSTITUTION:The magnetic paint formed by mixing magnetic powder 2 and a reinforcement member 4 in a binder 3 on an aluminum base 1 of the magnetic disc is spin-coated to scatter the magnetic powder 2 into uniform bundle and the reinforcement member 4 is fitted to a gap between bundles. After the spin coating, the magnetic disc 7 is loaded to a spindle 6 of a magnetic field orientation device, and four sets of magnets one set as two magnets are oriented to the face of the disc 7 at an interval of 90 deg.. Then the groove 9 is provided to the coating film formed by applying spin coating to the magnetic paint, the reinforcement member 4 is kept in the groove 9 to improve the coating film strength of the magnetic disc 7 thereby improving the electric characteristic.

10. 发明专利

JPS6180620A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：JPS6180620A
公开(公告)日：1986-04-24
申请号：JP20173184
申请日：1984-09-28
申请人： Hitachi Ltd
发明人： IMAMURA MASAAKI , KATO YOSHIKI , MAEDA FUJIO , TAKASAGO HIDEKAZU
IPC分类号： G11B5/708 , C09D5/23 , C09D7/12
摘要： PURPOSE: To obtain the titled magnetic recording medium having excellent electromagnetic characteristic and sliding-resistant strength characteristic by mixing a whisker into a magnetic paint in the magnetic recording medium obtained by coating the magnetic paint consisting of magnetic powder and an org. resin on a substrate.
CONSTITUTION: In example (I), 5wt% silicon carbide whisker having 0.01W0.3μm minor axis and 0.5W30μm major axis is mixed as a reinforcing additive, and the other composition consists of 55wt% magnetic powder, 17.6wt% epoxy resin, 17.6wt% phenolic resin, and 4.8wt% polyvinyl butyral. The evaluation of the strength of the coated film is performed by sliding the magnetic disk and the magnetic head at high speed and measuring the time until the coated film is destroyed, and the electromagnetic characteristic is shown by the signal- to-noise ratio, namely the S/N ratio. In example (I), the S/N ratio is remarkably improved as shown in the figure as compared with the conventional examples B and C, and the strength of the coated film as high as the conventional example can be obtained. In example (II), a silicon whisker and SiC powder are jointly used, and the magnetic characteristic and coated film strength are simultaneously improved in comparison with the conventional example.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：通过将由磁性粉末和有机组成的磁性涂料涂布而获得的磁记录介质中的晶须混合到磁性涂料中，获得具有优异的电磁特性和耐滑动强度特性的标题磁记录介质。树脂在基材上。构成：在实施例（I）中，将具有0.01-0.3mum短轴和0.5-30mum长轴的5wt％碳化硅晶须作为增强添加剂混合，另一组成由55wt％磁粉，17.6wt％环氧树脂， 17.6重量％酚醛树脂和4.8重量％聚乙烯醇缩丁醛。通过高速滑动磁盘和磁头来测量涂膜的强度的评估，并测量直到涂膜被破坏的时间，并且电磁特性由信噪比表示，即 S / N比。在实施例（I）中，与常规实施例B和C相比，S / N比显着提高，如实施例B和C所示，涂膜的强度可以得到。在实施例（II）中，共同使用硅晶须和SiC粉末，与传统实施例相比，磁特性和涂膜强度同时提高。

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