专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

31. 发明专利

JP2001028121A GLIDE CHECK HEAD, MANUFACTURE AND REPRODUCING METHOD OF THE SAME AND MANUFACTURE OF MAGNETIC DISK UTILIZING THE SAME 失效
公开(公告)号：JP2001028121A
公开(公告)日：2001-01-30
申请号：JP19976499
申请日：1999-07-14
申请人： HITACHI LTD
发明人： KASHIWASE HIDEKAZU , SHODA MITSUHIRO , KATAOKA HIROYUKI , KOKADO YUICHI , SUZUKI HIROYUKI
IPC分类号： G11B5/72 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To stably inspect a disk for a long time by inspecting the surface of the disk utilizing a glide check head having a surface layer formed thereon which has a surface hardness higher by a specified value or higher, than that of the disk halving a protective film having a specified hardness or higher. SOLUTION: A magnetic disk for a hard disk the surface of which is to be inspected consists of a multi-layered film having a Cr substrate 22, a magnetic layer 23, a protective layer 24 and a lubricating layer 25 laminated on a magnetic disk substrate 21 in this order. The protective layer 24 consists essentially of carbon and nitrogen, hydrogen, silicon, boron or the like is added to the layer to obtain a film halving a >=10 Gpa surface hardness. The film thickness of the protective layer 24 is, for example, 2-15 nm. And the surface of the disk can be stably inspected with reduced ware ratio of the surface layer by inspecting the surface utilizing a slider comprising a surface layer consisting essentially of carbon which has the surface hardness 3.5 times as higher as the surface hardness of the magnetic disk or higher.

32. 发明专利

JP2001006144A MAGNETIC RECORDING PLAYBACK APPARATUS AND MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JP2001006144A
公开(公告)日：2001-01-12
申请号：JP17628899
申请日：1999-06-23
申请人： HITACHI LTD
发明人： YAMANAKA ICHISUKE , KATAOKA HIROYUKI , HOSOE YUZURU , SUZUKI HIROYUKI
IPC分类号： G11B5/64 , G11B5/39 , G11B5/65 , G11B5/73 , G11B5/738 , H01F10/16 , H01F10/28 , H01F10/30
摘要： PROBLEM TO BE SOLVED: To improve the resolution and reduce the noise by setting the product of an activation volume and a spontaneous magnetization at a remanence coercive force point of a magnetic layer to a specified value or less, the product of a uniaxial anisotropic constant and a magnetization inversion volume divided by the product of the Boltzmann's constant and an absolute temp. to a specified or less and the dispersion thereof to a specified value or more. SOLUTION: The product v.Isb of an activation volume v and spontaneous magnetization Isb at a remanence coercive force point of a magnetic layer is set to 0.8×10-15emu or less, the product of a uniaxial anisotropic constant K and a magnetization inversion volume V divided by the product of the Boltzmann's constant k and an absolute temp. T, KV/kT is set to 80-120, and the dispersion thereof, S(KV/kT) is set to 0.7 or more. It is composed of a nonmagnetic substrate 1 of Al-Mg alloy, etc., covered with an amorphous Ni-P film, an adhesive reinforcing layer 2 required for less adhesion of a glassmade nonmagnetic substrate, etc., to a magnetic film, a Cr alloy orientation control layer 3, a magnetic film 4 contg. C as a main component such as Co-Cr-Ta, and a protection layer 5.

33. 发明专利

JP2000030235A MAGNETIC RECORDING MEDIUM AND MAGNETIC MEMORY DEVICE 失效
公开(公告)号：JP2000030235A
公开(公告)日：2000-01-28
申请号：JP19840598
申请日：1998-07-14
申请人： HITACHI LTD
发明人： YAMANAKA ICHISUKE , KATAOKA HIROYUKI , ISHIKAWA AKIRA
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/738 , H01F10/16
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording medium and a magnetic memory device having 5 Gbits/inch2 or higher recording density. SOLUTION: A ferromagnetic metal thin film having the following characteristics is used as a magnetic layer and combined with a magnetic head having a ferromagnetic thin film as a part of the magnetic pole. The ferromagnetic metal thin film has 1.1×10-15 emu or less for v.Isb which is the product of the activated volume and spontaneous magnetization at the remanence coercive force point, and has a remanence coercive force of 2400 Oe or larger, 2.05×10-12/(v.Isb) or smaller and 3.40×10-12/(v.Isb) or smaller.

34. 发明专利

JPH11316950A PRODUCTION OF MAGNETIC DISK 失效
公开(公告)号：JPH11316950A
公开(公告)日：1999-11-16
申请号：JP1401099
申请日：1999-01-22
申请人： HITACHI LTD
发明人： KATAOKA HIROYUKI , FURUSAWA KENJI , ABE KATSUO , DAIROKU NORIYUKI , KAWANA TAKESHI , KOKADO YUICHI , NAKAZATO JUN , HAYASHI MASAAKI
IPC分类号： G11B5/85 , C23C14/56
摘要： PROBLEM TO BE SOLVED: To improve the function of a processing system by providing at least one unit of a plurality of vacuum vessels connected in series with a vessel for preventing the mixing of processing atmosphere gases and subjecting magnetic disks to treatment while preventing the mixing of the gases with the preventive vessel when the atmosphere gases of the adjacent two treatments vary. SOLUTION: The respective vacuum vessels are equipped with the mechanisms necessary for the treatment. One unit each of vessel control computers 13 having the functions communicating with the outside is mounted on each vacuum vessel. These vessel control computers 13 are connected to each other by GP-IB communication circuits 31 and a host computer 14 for controlling the entire part of the vacuum treatment system is connected to the GP-IB communication circuits 31. The operation to carry pallets into the system from a carrying-in port on a left side, to execute the required treatment and measurement and to eject the pallets from an ejection port on the right side is repeated. During the repeating operation, the vessel control computers and the host computer operate by cooperating with each other with the signals flowing through the GP-IB communication circuits 31 in such a manner that the carrying-in and out operation is synchronized between two units of the vacuum vessels.

35. 发明专利

JPH1074314A MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING DEVICE 失效
公开(公告)号：JPH1074314A
公开(公告)日：1998-03-17
申请号：JP12375297
申请日：1997-05-14
申请人： HITACHI LTD
发明人： KANBE TETSUYA , ISHIKAWA AKIRA , FUKAYA SHINJI , TAMAI ICHIRO , YAKU SHINAN , HOSOE YUZURU , TANAHASHI KIWAMU , MATSUDA YOSHIFUMI , KATAOKA HIROYUKI , ONO TOSHINORI , ENDO NAOTO , URA KAZUHIRO
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/738 , H01F10/16 , H01F10/30
摘要： PROBLEM TO BE SOLVED: To obtain a medium having 2 G bits recording density per sq. inches and a mean time between failure of >=300,000 hours by using a magnetic record ing medium having a multilayered base film in which one layer consists of an amorphous or fine crystalline material containing Co. SOLUTION: A chemically reinforced soda-lime glass is used as a substrate 20. Then a first base layer 21 comprising Co-30at.%Cr-10%Zr alloy is formed to 50nm thickness, and then a second base layer 22 comprising Cr-15at.%Ti alloy to 30 nm thickness, a magnetic layer 23 comprising Co-20at.%, Cr-12at.%Pt alloy to 20 nm, and further a carbon protective film 24 to 10 nm are formed by DC sputtering method. The first base layer is formed without heating the substrate. Then the substrate is over heated to 250 deg.C by a lamp heater and the upper layers are formed. After the films are formed, a lubricant 25 prepared by diluting a perfluoroalkylpolyether material in a fluorocarbon material is applied thereon.

36. 发明专利

JP2565568B2 失效
公开(公告)号：JP2565568B2
公开(公告)日：1996-12-18
申请号：JP16708889
申请日：1989-06-30
申请人： HITACHI LTD
发明人： KAWANA TAKESHI , DAIROKU NORYUKI , SAWASE FUMIHIKO , SANO MAKOTO , TAKAHASHI NAOKI , ABE KATSUO , KATAOKA HIROYUKI
IPC分类号： C23C14/50

37. 发明专利

JPH08212531A MAGNETIC RECORDING MEDIUM AND PRODUCTION THEREOF 失效
公开(公告)号：JPH08212531A
公开(公告)日：1996-08-20
申请号：JP2069795
申请日：1995-02-08
申请人： HITACHI LTD
发明人： KATAOKA HIROYUKI , KANBE TETSUYA , KASHIWASE HIDEKAZU , FUJITA SHIOJI , FURUSAWA KENJI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/738 , G11B5/84 , G11B5/85 , H01F41/20
摘要： PURPOSE: To obtain a multilayered film type structure of a magnetic recording medium suppressing the generation of recording noise at the time of high density recording and a method to produce the magnetic recording medium. CONSTITUTION: A 1st underlayer 5 of Cr, Ti, Zr, Al, Si, V, Nb, Mo or an alloy based on such metals, a 2nd underlayer 4 of Ta or Hf, a 3rd underlayer 3 of Cr, V or an alloy of them, a magnetic layer 2 of a Co alloy and a protective lubricative layer 1 are successively laminated on a nonmagnetic substrate 6. The average coercive force of the resultant magnetic recording medium is increased by 10-20% as compared with the conventional magnetic recording medium having a similar structure and the standardized noise factor is reduced by 10-18%.

38. 发明专利

JPH0813143A PLASMA TREATMENT AND TREATING DEVICE 失效
公开(公告)号：JPH0813143A
公开(公告)日：1996-01-16
申请号：JP14282194
申请日：1994-06-24
申请人： HITACHI LTD
发明人： SASAKI SHINJI , SANO HIDEZO , OTSUBO TORU , NISHIMURA NORIMASA , KATAOKA HIROYUKI , INABA HIROSHI , ABE KATSUO
IPC分类号： H05H1/46 , C23C14/34 , C23C16/50 , C23C16/509 , G11B5/85
摘要： PURPOSE:To provide a method capable of simultaneously and accurately treating both surfaces of a substrate even if this substrate is not a conductor at the time of subjecting both front and rear surfaces of the substrate to thin film formation and the plasma treatment, such as etching and heating and a device therefor. CONSTITUTION:A circuit for impressing high-frequency potential between a first target electrode 5 and a second target electrode 3. A substrate holding mechanism 21 is so formed that an electrically insulated state is maintained between this mechanism and the high-frequency circuit except at the contact point with the substrate 9. The first target electrode 5 is connected to a high-frequency power source 14 via a capacitor 35 and a matching device 13. A bias current flows via the capacitor between both surfaces of the substrate when a potential difference (bias potential) is generated between two plasmas 10 and 8. As a result, a high-frequency electric field is generated on both front and rear surfaces of the substrate to accelerate incident ions. The evaporation of film by a current concentration at the contact points of the electrodes with the substrate surfaces like heretofore and the consequent abnormal discharge and bias impression defect do not arise.

39. 发明专利

JPH0249215A MAGNETIC RECORDING MEDIUM AND PRODUCTION THEREOF 失效
公开(公告)号：JPH0249215A
公开(公告)日：1990-02-19
申请号：JP12151189
申请日：1989-05-17
申请人： HITACHI LTD
发明人： FURUSAWA KENJI , ABE KATSUO , KATAOKA HIROYUKI , TAKAGAKI ATSUSUKE , SHIROISHI YOSHIHIRO , TSUMITA NORIKAZU
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/667 , G11B5/72 , G11B5/73 , G11B5/738 , G11B5/851
摘要： PURPOSE:To obtain the recording medium which decreases modulation by successively laminating at least two layers of sputtered layers of thin chromium films having bow-shaped columnar structures, the sputtered layer of a thin magnetic alloy film and a thin protective film on a nonmagnetic substrate. CONSTITUTION:Ni-P is plated on the Al alloy substrate 11 and thereafter, the surface thereof is polished and textured. The thin Cr films 25 are formed of the Cr layer 12 having the 1st bow-shaped columnar structure projecting in the transporting direction of the substrate 11, the Cr layers 13, 14 having the 2nd, 3rd bow-shaped columnar structures and the thin magnetic film 26 and the protective layer 17 are provided thereon. The substrate 11 is transported in a direction 22 at the time of film formation. The curvature (r) of the bow-shaped columnar layers 12, 13, 14 is specified to about 240nm and the thickness t of the respective layers to about 130nm. The value of r/t in this case is about 1.8. The r/t is about 1 in case of one layer of the thin Cr film consisting of the bow-shaped columnar structure. The columnar structures grow more perpendicularly to the substrate surface as the value of the r/t is larger and, therefore, the magnetic anisotropy in the substrate transporting direction of the magnetic recording medium is decreased and the coercive force Hc uniform in the circumferential direction of the disk is applied. The recording medium which decreases the modulation is thus obtd.

40. 发明专利

JPH01155283A EVALUATING APPARATUS OF MAGNETIC DISK 失效
公开(公告)号：JPH01155283A
公开(公告)日：1989-06-19
申请号：JP31401287
申请日：1987-12-14
申请人： HITACHI LTD
发明人： ABE KATSUO , KATAOKA HIROYUKI , FURUSAWA KENJI
IPC分类号： G01R33/12 , G01R33/032
摘要： PURPOSE:To enable the rapid execution of measurement in a non-destructive and non-contact manner, by providing a focusing optical device focusing a polarized light and applying same obliquely to a magnetic disk and a magnetic field generating device impressing a horizontal magnetic field on the magnetic disk. CONSTITUTION:A light flux 2 emitted from a laser light source 1 passes through a collimator lens 3 and it is polarized by a polarizer 4 and applied to a magnetic disk 6 by a focusing lens 5. Then, it is subjected to minute rotary polarization by the magnetic disk 6, a reflected light 7 therefrom passes through an objective lens 8 and an analyzer 9, and the optical signal is transduced into an electric signal by a photodetector 10. On the occasion, a change in the polarized state of the reflected light 7 caused by sweeping of a Weiss-type horizontal magnetic field impressing device installed just under an irradiated surface of the magnetic disk is taken out from the detector 10 as a change in the optical signal, i.e. the electric signal. Accordingly, the magnetic characteristic of the magnetic disk can be measured rapidly without destructing the magnetic disk and in a non-contact manner.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式