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11. 发明专利

JPH0778327A MAGNETIC MULTILAYERED RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE USING THE SAME 失效
公开(公告)号：JPH0778327A
公开(公告)日：1995-03-20
申请号：JP22543993
申请日：1993-09-10
申请人： HITACHI LTD
发明人： HOSOE YUZURU , SHIROISHI YOSHIHIRO , ISHIKAWA AKIRA , TOMIYAMA HIROSHI , YOSHIDA KAZUYOSHI , YAMAMOTO TOMOO , YAKU SHINAN , OZAKI AKIRA , ABE KATSUO , NARUSHIGE SHINJI , KODAMA NAOKI
IPC分类号： G11B5/02 , G11B5/31 , G11B5/39 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/738
摘要： PURPOSE:To obtain a high S/N and high recording density in the magnetic multilayered recording medium by making coercive force of the medium at the time of impressing a magnetic field upon the medium in the parallel direction to the traveling direction of a magnetic head larger than the coercive force in the orthogonal direction. CONSTITUTION:The storage device is composed of the magnetic recording medium 31, a rotational driving part 32 and a recording/reproducing signal processing means 35. An MR head is used for a reproducing part of the magnetic head 33, and the recording medium 31 is composed of plural magnetic layers and non-magnetic layers arranged between them, formed directly or via a base layer on a non-magnetic disk substrate. Moreover, the coercive force is selected, provided that the coercive force Hc(theta) at the time of impressing the magnetic field approximately parallel to the traveling direction is larger than the coercive force Hc(r) at the time of impressing the magnetic field in an approximately orthogonal direction. By this constitution, a high S/N can be obtained, and the magnetic storage device with high recording density and large capacity in small size and with long average intervals of occurrence of a fault can be obtained.

12. 发明专利

JPH0773433A MAGNETIC RECORDING MEDIUM, ITS PRODUCTION AND MAGNETIC RECORDER 失效
公开(公告)号：JPH0773433A
公开(公告)日：1995-03-17
申请号：JP22122793
申请日：1993-09-06
申请人： HITACHI LTD
发明人： ISHIKAWA AKIRA , SHIROISHI YOSHIHIRO , HOSOE YUZURU , YAKU SHINAN , YAMAMOTO TOMOO , IGARASHI KAZUSUKATSU
IPC分类号： G11B5/02 , G11B5/39 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/85 , G11B5/851
摘要： PURPOSE:To provide a magnetic recording medium, its producing method, and a magnetic recorder where low floating of a head and high-density recording are possible. CONSTITUTION:With respect to the magnetic recording medium which is provided with at least a nonmagnetic disk substrate 11 and a magnetic film 14 formed on the nonmagnetic disk substrate 11 directly or with a foundation film 13 of at least one layer between them, the value of a product Brdelta between a residual magnetic flux density Br of the magnetic film 14 measured in the head running direction and an overall film thickness delta of the magnetic film is set to 5Gmum to

13. 发明专利

JPH0729142A THIN-FILM MAGNETIC RECORDING MEDIUM AND ITS MANUFACTURE AND MEMORY DEVICE 失效
公开(公告)号：JPH0729142A
公开(公告)日：1995-01-31
申请号：JP16886193
申请日：1993-07-08
申请人： HITACHI LTD
发明人： CHIBA KATSUYOSHI , SHIROISHI YOSHIHIRO , HOSOE YUZURU , ISHIKAWA AKIRA , SUGINO KENZO
IPC分类号： G11B5/02 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/85
摘要： PURPOSE:To attain specific high density by turning particles into a highly orientated and highly dispersed state via a physically evaporating ambience through an interaction between the wave energy from a wave driving body such as sound waves or the like and a light, etc., when a magnetic thin film is to be formed on a substrate in vacuum. CONSTITUTION:A supporting stage 2 of ceramic, Teflon, etc., is set in a vacuum box 1 of a sputtering apparatus. There are arranged wave driving bodies 4a, 4b so that particles physically evaporated on a, e.g. 3.5-inch aluminum non- magnetic substrate 3 having an NiP undercoating layer are transmitted onto the supporting stage 2 with accompanying the wave energy of sound waves and ultrasonic waves, and moreover, red semiconductor lasers 40a, 40b of a specific wavelength are provided. The wave energy from the wave driving bodies 4a, 4b is allowed to interact with the light or laser, whereby the particles are turned into a highly orientated and highly dispersed state through the physically evaporating ambience. Accordingly, recording with high density not smaller than 900Mb/in or so is achieved.

14. 发明专利

JPH06176341A MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE 失效
公开(公告)号：JPH06176341A
公开(公告)日：1994-06-24
申请号：JP32915492
申请日：1992-12-09
申请人： HITACHI LTD
发明人： YAMAMOTO TOMOO , ISHIKAWA AKIRA , SHIROISHI YOSHIHIRO , HOSOE YUZURU , TAKESHITA MASATOSHI , YAKU SHINAN , OZAKI AKIRA , MANGYO EMI
IPC分类号： G11B5/02 , G11B5/39 , G11B5/64 , G11B5/66 , G11B5/73 , G11B5/738
摘要： PURPOSE:To provide the magnetic recording medium with which the reproduced signals at the time of high-density recording are large and good S/N is obtainable and the large-capacity high-density magnetic storage device. CONSTITUTION:This magnetic storage medium has a nonmagnetic substrate 11, C layers 12 provided on this nonmagnetic substrate 11 and further, single or plural magnetic layers 14, 14' provided via a nonmagnetic ground layer 13 or directly thereon and, in the case of the plural magnetic layers, has nonmagnetic intermediate layers 15, 15'' disposed between the magnetic layers. The magnetic recording medium and a magnetic head formed by using metallic thin films in at least a part of magnetic poles or a magnetic head utilizing a magneto-resistance effect for reproduction are combined.

15. 发明专利

JPH05197942A MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDER 失效
公开(公告)号：JPH05197942A
公开(公告)日：1993-08-06
申请号：JP901192
申请日：1992-01-22
申请人： HITACHI LTD
发明人： ISHIKAWA AKIRA , SHIROISHI YOSHIHIRO , HISHIYAMA SADAO , OONO TSUGUYUKI , YAKU SHINAN , KATO YUKIO , YAMAMOTO TOMOO
IPC分类号： G11B5/66 , G11B5/64 , G11B5/738 , H01F10/16
摘要： PURPOSE:To enable high density recording by using a magnetic recording medium with prescribed underlayers and magnetic layers formed on both sides of the substrate. CONSTITUTION:Nonmagnetic plating layers 12, 12' of NiP, NiWP, etc., are formed on both sides of a substrate 11 for a magnetic disk made of an Al-Mg alloy, chemical strengthening glass, ceramics, etc. Underlayers 13, 13' of a metal such as Cr, Mo or W or an alloy and magnetic layers 14, 14' of a metal such as Co, Ni or Co-Cr are successively formed on the nonmagnetic plating layers 12, 12' and nonmagnetic protective layers 15, 15' of carbon, SiO2, etc., are further formed on the magnetic layers 14, 14' to obtain a magnetic recording medium. When this magnetic recording medium is used, a small-sized magnetic recorder having large capacity is obtd.

16. 发明专利

JPH0589452A THIN-FILM TYPE MAGNETIC RECORDING MEDIUN OR DEVICE AND PRODUCTION OF MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH0589452A
公开(公告)日：1993-04-09
申请号：JP3009091
申请日：1991-02-25
申请人： HITACHI LTD
发明人： ISHIKAWA AKIRA , SHIROISHI YOSHIHIRO , HISHIYAMA SADAO , OONO TSUGUYUKI , YAKU SHINAN , YAMAMOTO TOMOO
IPC分类号： G11B5/72 , G11B5/64 , G11B5/65 , G11B5/725 , G11B5/73 , G11B5/738 , G11B5/84
摘要： PURPOSE:To provide the high-density magnetic recording device having high reliability by smoothing the surfaces of protective films and magnetic films, thereby preventing the stress concentration in the protective films and improving sliding resistance and corrosion resistance. CONSTITUTION:Plating layers of a nonmagnetic substrate 12 are formed on both surfaces of a disk substrate 11 and the surfaces thereof are polished. This substrate is mounted into a magnetron sputtering device. Chromium substrate films 13 varying in purity are formed by using chromium target materials varying in impurity concn. Magnetic metallic films 14 are formed thereon and further carbon protective films 15 are formed thereon. Finally, lubricating layers consisting of adsorptive perfluoroalkyl polyether, etc., are formed thereon. The magnetic disk produced in such a manner have the extremely high corrosion resistance and sliding resistance.

17. 发明专利

JPH0293539A METHOD FOR PROCESSING INORGANIC RESIST OF PEROXOPOLYTUNGSTIC ACID 失效
公开(公告)号：JPH0293539A
公开(公告)日：1990-04-04
申请号：JP24415988
申请日：1988-09-30
申请人： HITACHI LTD
发明人： OKAMOTO HIROSHI , ISHIKAWA AKIRA , KUDO TETSUICHI , MIYAUCHI KATSUMI
IPC分类号： G03F7/004 , G03F7/027 , G03F7/038
摘要： PURPOSE:To obtain high and stable sensitivity by controlling atm. humidity at the time of exposing to the oxide inorg. resist contg. peroxo and controlling particularly the humidity to a specific range. CONSTITUTION:The oxide inorg. resist contg. the peroxo is exposed in a 50 to 99% atm. humidity range and is then developed. The oxide inorg. resist contg. the peroxo is the oxide of transition metals such as tungsten, molybdenum, niobium and tantalum or the oxide mixture composed thereof. Since the photosensitive reaction of the peroxopolytungstic acid is accelerated by the humidity in an atmosphere gas, i.e. water, the rate of the sensitivity reaction is controlled and the stable sensitivity is eventually obtd. if the humidity is controlled. The sensitivity of the inorg. resist of the peroxopolytungstic acid is stabilized in this way and is improved about 2 fold.

18. 发明专利

JPS63184737A PATTERN FORMING METHOD 失效
公开(公告)号：JPS63184737A
公开(公告)日：1988-07-30
申请号：JP1607387
申请日：1987-01-28
申请人： HITACHI LTD
发明人： ISHIKAWA AKIRA , OKAMOTO HIROSHI , KUDO TETSUICHI , MIYAUCHI KATSUMI , MURAI FUMIO , OKAZAKI SHINJI
IPC分类号： G03F7/038 , G03C1/725 , G03F7/075 , G03F7/11
摘要： PURPOSE:To increase the sticking strength between a lower layer of an org. resin and an upper layers of peroxocondensed acid by using a silane coupling agent as a sticking agent between the lower layer and the upper layer in two layers process. CONSTITUTION:The silane coupling agent is used for the sticking agent between the layer composed of peroxocondensed acid and the layer composed of the org. polymer resin. The silane coupling agent is composed of an org. silicone monomer having >=2 different reactive groups in a molecular. One of the two reactive groups is the reactive group capable of chemically bonding with an inorg. substance such as methoxy, ethoxy and silanol group, and another one of said reactive groups is the reactive group capable of chemically bonding with an org. material such as vinyl, epoxy, methacryl, amino and mercaphto groups. Thus, in the two layer resist process in which the peroxocondensed acid inorg. resist and the org. resin are used, the peeling phenomenon between the peroxocondensed acid and the org. resin which occurs at the time of developing is prevented, and a fine pattern having

19. 发明专利

JPS62182644A METHOD FOR DETECTING CONCENTRATION OF SUBSTANCE 失效
公开(公告)号：JPS62182644A
公开(公告)日：1987-08-11
申请号：JP2375586
申请日：1986-02-07
申请人： HITACHI LTD
发明人： KAWAMURA TAKESHI , ISHIKAWA AKIRA , KUDO TETSUICHI
IPC分类号： G01N27/416
摘要： PURPOSE:To independently measure the concns. of methanol etc. in an electrolyte, by changing relative sensitivity to methanol etc. by changing the Mo-to-W ratio and/or applying potential of three detection electrodes. CONSTITUTION:When electrolysis is performed in an aqueous solution containing 1mol/l of H2SO4 and 1mol/l of methanol, formaldehyde or formic acid at constant potential using an electrode comprising a carbide catalyst W1-XMoXC, the relation between a current value and Mo-content (x) is shown by a drawing. As (x) increases, the sensitivity to methanol is enhanced and the sensitivity to formic acid is lowered while the sensitivity to formaldehyde is slightly enhanced. On the basis of this experimental result, the electrode comprising the catalyst wherein (x) is 0 is set to 0.3V and electrodes wherein (x) is 0.7 to 0.2V and 0.5V and the concn. dependence of response to each org. substance in a 1mol/l H2SO4 electrolyte is measured. In such a case that or. substances are mixed in each electrode system, an additivity is formed.

20. 发明专利

JPS61121264A Catalitic material for electrode 失效
标题翻译：电极用催化材料
公开(公告)号：JPS61121264A
公开(公告)日：1986-06-09
申请号：JP24066784
申请日：1984-11-16
申请人： Hitachi Ltd
发明人： KAWAMURA TAKESHI , KUDO TETSUICHI , ISHIKAWA AKIRA
IPC分类号： H01M4/90
CPC分类号： H01M4/90
摘要： PURPOSE:To obtain highly activating and excellently performance electrodes by forming catalitic material used in fuel electrodes of a fuel cell from two sorts of compounds, namely, complex carbide consisting of tungsten and molybdenum, and compound of germanium, antimony, etc. CONSTITUTION:Catalitic material for electrode used in fuel electrodes of a fuel cell employing organic compounds such as methanol, formalin, etc., is prepared in such a way that two sorts of compounds, namely, complex carbides consisting of tungsten and molybdenum, W1-xMoxC(0
摘要翻译：目的：通过从两种化合物，即由钨和钼组成的复合碳化物，以及锗，锑等的化合物形成燃料电池的燃料电极中使用的催化剂材料，以及锗，锑等化合物，来获得高活性和卓越的性能电极。使用甲醇，福尔马林等有机化合物的燃料电池的燃料电极中使用的电极用材料以两种化合物，即由钨和钼组成的复合碳化物，W1-xMoxC（0 <= X <= 1），并且包括元素Ge，As，Se，Sn，Sb，Te，Pb，Bi，Re和Os中的至少一种的化合物浸入或浸入并同时电镀由添加有碳化物催化的助催化剂元素组成的化合物溶液。因此，可以获得高活性和优异的性能的燃料电极，而不需要作为用作电极的催化剂材料的铂族的这种稀有和昂贵的元素。

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