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41. 发明专利

JPH03252922A MAGNETIC DISK DEVICE, MAGNETIC RECORDING MEDIUM AND PRODUCTION OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH03252922A
公开(公告)日：1991-11-12
申请号：JP4928190
申请日：1990-03-02
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： G11B5/82 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/738 , G11B5/84 , G11B21/12 , G11B21/21
摘要： PURPOSE:To maintain floating stability for a long time by providing lots of specified projections having flat surfaces on the surface of a magnetic disk. CONSTITUTION:The surface of the magnetic disk is divided to concentrically and radially provide recessed parts thereon, leaving projections 7 having flat surfaces with at least an interval of 0.2-50 mum so that the whole surface of a slider mounted on any position on the disk can be brought into contact with the projections while the disk 14 is rotated once. Thereby, frictional force and absorption between a magnetic head and the disk can be reduced, which maintains floating stability of the magnetic head all over the whole surface of the magnetic recording medium and prevents variation in output due to variation in the floating height.

42. 发明专利

JPH03216801A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH03216801A
公开(公告)日：1991-09-24
申请号：JP1193590
申请日：1990-01-23
申请人： HITACHI LTD
发明人： TANI KOUJI , UTA KATSUO , OURA MASAKI , YASHIKI HIROSHI , KATO YOSHIKI
IPC分类号： G11B5/82 , C09D5/23 , C09D7/12 , G11B5/02 , G11B5/65 , G11B5/73 , G11B5/738 , G11B21/21
摘要： PURPOSE:To secure stability in floating by setting the sum of the maximum projection height decided based on the surface roughness of a recording medium and the maximum projection height decided based on the surface roughness of a slider surface

43. 发明专利

JPH0287324A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH0287324A
公开(公告)日：1990-03-28
申请号：JP23869688
申请日：1988-09-26
申请人： HITACHI LTD
发明人： KATO AKIRA , YAMADA KAZUO , IMAMURA MASAAKI , KATO YOSHIKI , AKAGI MOTOO
IPC分类号： G11B5/72 , C09D171/02 , G11B5/725
摘要： PURPOSE:To increase sliding strength and to reduce sticking by specifying the mean diameter of solid particles contained in a liquid lubricant layer. CONSTITUTION:The particles 3 having 40nm or more mean particle size are incorporated into the liquid lubricant layer 4. The amount of particles 3 is preferably 0.5-50wt.% of the sum of particles and lubricant. The particles 3 in the liquid lubricant layer 4 keeps a distance between the magnetic head and the recording medium when the head and the medium interact. Namely, the particles prevent contact of the head to the medium through the lubricant 4 or increase of the contact area. Thus, sticking of a head can be avoided.

44. 发明专利

JPS6398837A METHOD AND DEVICE FOR APPLYING MAGNETIC FILM OF MAGNETIC DISK 失效
公开(公告)号：JPS6398837A
公开(公告)日：1988-04-30
申请号：JP24314786
申请日：1986-10-15
申请人： HITACHI LTD
发明人： IKEDA FUMIAKI , KATO YOSHIKI , KAGOKI YOSHIYUKI
IPC分类号： G11B5/82 , G11B5/842
摘要： PURPOSE:To contrive the improvement of the quality by tilting a disk base and a chamber surrounding the disk substrate simultaneously and relatively and driving the tilted disk substrate at higher speed than that at the point of time of magnetic paint applying so as to form a magnetic film. CONSTITUTION:Since an applying nozzle 11 applies coating while moving along the face of the substrate, both faces of the disk substrate 100 are applied entirely. Then in retrogressing a rod by driving a cylinder being a driving means 20, a frame assembly 13 is moved around a flucrum A while being guided along a guide plate 14 by the rod and a spindle 1 is tilted similarly attended with the tilt of the frame assembly 13 similarly, then both the disk substrate 100 and the chamber 10 are tilted relatively at the same time. In driving the spindle 1 by a drive source to drive the disk substrate 100 more than that at the application of the magnetic paint, the magnetic paint is shaken off by the centrifugal force by the drive and a magnetic film is formed on both faces of the disk substrate 100.

45. 发明专利

JPS6348612A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6348612A
公开(公告)日：1988-03-01
申请号：JP19051886
申请日：1986-08-15
申请人： HITACHI LTD
发明人： FUKUYA HAJIME , AKAGI MOTOO , KATO YOSHIKI , NAGASHIRO KAZUICHI
IPC分类号： C09D5/23 , C09D129/04 , C09D161/04 , C09D161/06 , C09D163/00 , G11B5/70 , G11B5/82 , G11B5/84
摘要： PURPOSE:To decrease electrical defects of a magnetic disk by specifying the weight ratio of ferromagnetic powder and coated film and the film thickness of a coated film. CONSTITUTION:This recording medium has 66-90wt% ratio of the magnetic powder constituting the coated film and =66wt%. Said output increases further if said content is particularly >=70wt%. However, the amt. of the binder decreases on the contrary with the coated film contg. the magnetic powder at an excessively high ratio and since the decreased strength of the coated film is caused therefrom, the content of the magnetic powder is preferably

46. 发明专利

JPS6326821A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6326821A
公开(公告)日：1988-02-04
申请号：JP16991286
申请日：1986-07-21
申请人： HITACHI LTD
发明人： INOMATA YOICHI , NAGASHIRO KAZUICHI , KANDA SATOSHI , HACHIMORI SHIGEO , KATO YOSHIKI
IPC分类号： G11B5/70 , C09D5/23 , C09D127/04 , C09D127/06 , C09D161/04 , C09D161/06 , C09D163/00 , G11B5/73
摘要： PURPOSE:To obtain a recording medium of which the recording and reproducing output does not decrease even if a bit area is reduced by forming a magnetic layer in such a manner that the S.F.D value thereof is 0.1-0.6 or the S* value of the magnetic layer has 0.6-1.0 value. CONSTITUTION:The magnetic recording medium formed with the magnetic layer having the S.F.D. value in the 0.1-0.6 range or the magnetic recording medium formed with the magnetic layer having the S* value in the 0.6-1.0 range is obtd. as the magnetic recording medium. The S.F.D. value is determined by forming the differential curve 2 of the B-H curve 1 of the magnetic layer from said curve, designating the max. crest value thereof as l, determining the points X1, X2 on the axis of abscissa where the crest value is l/2, and further determining the point HC on the axis of abscissa of the crest value l. The S.F.D value is determined from (X1-X2)/Hc. The S* value is determined by forming straight lines 3, 4 with respect to the B-H curve of the magnetic layer and determining the value Hs on the axis of abscissa corresponding to the intersected point 6 thereof. The S* value is obtd. from Hc/Hs. Such magnetic recording medium has the higher density and the smaller bit area and permits the quick reaction of magnetic moment in spite of an increase in writing frequency. The recording and reproducing output is, therefore, remarkably improved.

47. 发明专利

JPS62285229A PAINT COATING DEVICE FOR MAGNETIC DISK 失效
公开(公告)号：JPS62285229A
公开(公告)日：1987-12-11
申请号：JP12794786
申请日：1986-06-04
申请人： HITACHI LTD
发明人： OKAMURA TOMOYOSHI , IINO TOSHIYOSHI , KATO YOSHIKI , KAGOKI YOSHIYUKI
IPC分类号： B05C11/08 , G11B5/842
摘要： PURPOSE:To form a coating film on the entire face of a disk by less quantity of paint by giving vibration to a nozzle at the tip of a paint supply tube in the radial or axial direction of the disk or pulsating the supplied paint so as to form lots of minute projections to the zone of paint supplied onto the disk. CONSTITUTION:In applying an AC current to a solenoid 12, an electromagnetic force is generated and a nozzle 5 is vibrated axially to the disk 1. In supplying a paint to the vibrating nozzle 5 and moving a nozzle arm 7 radially, a coating pattern is obtained on the face of the disk 1. Lots of minute ruggedness is caused at both sides of the painting line 18 of the paint. In rotating the disk at a number of revolutions N2, the paint is being spread toward the outside radially from the projections 19 at the peripheral of the paint line. That is, lots of stripes 19a are caused. Thus, the paint is supplied to the rotating disk, then the time required to spread the paint over the entire disk is reduced remarkably.

48. 发明专利

JPS626428A MAGNETIC COATED FILM 失效
公开(公告)号：JPS626428A
公开(公告)日：1987-01-13
申请号：JP14470385
申请日：1985-07-03
申请人： HITACHI LTD
发明人： TAKASAGO HIDEKAZU , MAEDA FUJIO , KATO YOSHIKI , IMAMURA MASAAKI
IPC分类号： G11B5/702 , C09D5/23 , C09D161/04 , C09D161/10 , C09D163/00 , G11B5/73
摘要： PURPOSE:To improve the strength of a coated film by dispersing magnetic powder and powders of other additives, etc. and uniformly dispersing a resin which adheres to a substrate within the coated film. CONSTITUTION:The resin which uniformly and thoroughly disperses the magnetic powder and the resin which has a thermosetting property, reacts with a crosslinking agent to make a high-molecular polymer and adheres the magnetic powder to the substrate is used. For example, the mixing and dispersion in the different resins are accelerated with an increase in the mixing time with the limit at around 20hr. The coated film structure which has a high crosslinking density and high adhesive power to the substrate after curing is obtd. The mixing and dispersion among the resins are thereby thoroughly executed and the magnetic film having the high crosslinking density and uniform structure after thermal curing is formed, by which the strength of the coated film is improved.

49. 发明专利

JPS6187209A Magnetic head 失效
标题翻译：磁头
公开(公告)号：JPS6187209A
公开(公告)日：1986-05-02
申请号：JP21250785
申请日：1985-09-27
申请人： Hitachi Ltd
发明人： KATO AKIRA , ISHIHARA HEIGO , KATO YOSHIKI , IMAMURA MASAAKI , NAKAMURA TOMIO
IPC分类号： G11B5/60 , G11B5/187 , G11B5/255
CPC分类号： G11B5/187
摘要： PURPOSE:To eliminate a slide breakdown and abnormal abrasion between a magnetic head and recording medium by treating the recording medium facing surface of the magnetic head so that its surface energy is less than a specific value. CONSTITUTION:A surface treated film 3 having film thickness (d) is formed on the recording medium facing surface 2 of a cre 1. A surface treating agent is applied over the recording medium facing surface of the magnetic head to reduce the surface energy of the recording medium facing surface of said mag netic head below 40dyne/cm. Consequently, the dislocation of a lubricant from the recording medium and the sticking of foreign matter are reduced, and the life of the recording medium and magnetic head is improved.
摘要翻译：目的：通过处理磁头的面向记录介质的表面，使其表面能量小于特定值，消除磁头和记录介质之间的滑动破坏和异常磨损。构成：具有膜厚度（d）的表面处理膜3形成在cre 1的记录介质对向表面2上。表面处理剂施加在磁头的记录介质面对表面上，以降低表面能将所述磁头的记录介质面向表面低于40dyne / cm。因此，减少了润滑剂从记录介质的脱位和异物的粘附，从而提高了记录介质和磁头的使用寿命。

50. 发明专利

JPS6180619A Substrate for magnetic disk 失效
标题翻译：磁盘基板
公开(公告)号：JPS6180619A
公开(公告)日：1986-04-24
申请号：JP20173584
申请日：1984-09-28
申请人： Hitachi Ltd
发明人： ITO YASUSHI , IMAMURA MASAAKI , KATO YOSHIKI
IPC分类号： G11B5/82 , G11B5/73 , G11B5/733
摘要： PURPOSE: To obtain the titled lightweight substrate for a magnetic disk while keeping high rigidity by mixing a whisker into an aluminum alloy.
CONSTITUTION: Although an aluminum alloy sheet is widely used as the substrate for a magnetic disk, a coarse intermetallic compd. is formed between aluminum and an impurity element Fe which is contained in the sheet in a small amt., and the compd. is the prime cause of a bit error when the substrate is used for a magnetic disk. When the content of the impurity element Fe is reduced in high-purity aluminum, the mechanical strength is decreased. When a silicon carbide whisker 3 having 0.01W0.3μm diameter is mixed into a high- purity aluminum alloy 2 contg. ≤0.01% impurity element Fe and which is used as a substrate 1 for a magnetic disk, the tensile strength is increased as the volume ratio of the whisker is increased. Accordingly, even when the substrate 1 for a magnetic disk is thinned and made lightweight, high rigidity can be maintained.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：通过将晶须与铝合金混合，获得标准的轻质磁盘基板，同时保持高刚性。构成：虽然铝合金板被广泛用作磁盘的基板，但是粗的金属间化合物。形成在铝和杂质元素Fe之间，该杂质元素Fe以小的形式包含在片材中。是当基板用于磁盘时的误差的主要原因。当杂质元素Fe的含量在高纯度铝中降低时，机械强度降低。当将具有0.01-0.3μm直径的碳化硅晶须3混合到高纯度铝合金2中时， <= 0.01％的杂质元素Fe，其用作磁盘的基板1，拉伸强度随着晶须的体积比增加而增加。因此，即使当用于磁盘的基板1变薄并且重量轻时，也可以保持高刚性。

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