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1. 发明专利

JP2004080856A Power converter 审中-公开
公开(公告)号：JP2004080856A
公开(公告)日：2004-03-11
申请号：JP2002234294
申请日：2002-08-12
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： SASAKI KANAME , HAMADA HARUKI , HAYASHI MASAAKI , SAITO RYUICHI , TANBA AKIHIRO , NAKAMURA TAKAYOSHI
IPC分类号： H01L23/473 , H01L23/36 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To reduce pressure loss in a passage and obtain high heat radiating performance by a uniform flow, in a semiconductor module which improves the cooling performance, by bringing coolant into direct contact with a heat-radiating board. SOLUTION: The magnification/reduction of the sectional area of a coolant passage is suppressed, by providing a liquid-cooled heat radiator 1 with fins, and also the forms of the fins are made identical at the contact face of the enlarged heat conductive face of the heat-radiating board 2. COPYRIGHT: (C)2004,JPO

2. 发明专利

JP2515771B2 失效
公开(公告)号：JP2515771B2
公开(公告)日：1996-07-10
申请号：JP30642186
申请日：1986-12-24
申请人： HITACHI LTD
发明人： SHIROISHI YOSHIHIRO , HISHAMA SADAO , SUZUKI HIROYUKI , TSUMITA NORIKAZU , SUGANUMA YASUO , GOHARA YOSHIO , HAYASHI MASAAKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/706 , G11B5/73 , G11B5/738

3. 发明专利

JPH0518175B2 失效
公开(公告)号：JPH0518175B2
公开(公告)日：1993-03-11
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

4. 发明专利

JPH03207992A HEAT EXCHANGER 失效
公开(公告)号：JPH03207992A
公开(公告)日：1991-09-11
申请号：JP154290
申请日：1990-01-10
申请人： HITACHI LTD
发明人： ONIHASHI TOKUYUKI , UENO TOSHIO , HAYASHI MASAAKI
IPC分类号： G21D1/00 , F28D7/12
摘要： PURPOSE:To hold the heat insulating states on inlet and outlet sides, to enhance heat exchange efficiency and to achieve the effective and practical use of the space of a heat exchanger and the rationalization of planning and manufacturing by reducing the rising of the liquid level in a double pipe chamber when temp. and pressure are changed. CONSTITUTION:Since temp. difference is large between the secondary system inlet 1 and outlet 2 of a fast breeder reactor, a double pipe chamber 4 is brought to a heat insulating state on the sides of the secondary system inlet 1 and outlet 2 of the reactor to play an important role holding the capacity of a heat exchanger. The double pipe chamber 4 is constituted so that the cross-sectional area of the lower part thereof is made large and the lower and thereof is opened and inert gas is introduced into the double pipe chamber 4. The liquid level of a cooling material rises at the lower end of the double pipe chamber at the time of operation when the temp. and pressure of a secondary system change but, since the volume of the cooling material is reduced by the rising of pressure, the rising of the liquid level becomes the range of the lower part having a large cross-sectional area. When the inert gas is present in the upper part of the double pipe chamber 4, the cooling material is thermally insulated on the inlet and outlet sides and heat exchange efficiency can be enhanced.

5. 发明专利

JPH03185601A MAGNETIC DISK DEVICE AND METHOD FOR RECORDING AND REPRODUCING INFORMATION 失效
公开(公告)号：JPH03185601A
公开(公告)日：1991-08-13
申请号：JP32144589
申请日：1989-12-13
申请人： HITACHI LTD
发明人： MITSUOKA KATSUYA , FUKUI HIROSHI , AIHARA MAKOTO , TANABE MASANORI , FUYAMA MORIAKI , NARUSHIGE SHINJI , SUGITA KEN , SHIROISHI YOSHIHIRO , AOI MOTOI , SAITO SUKEO , KAWAKAMI KANJI , TSUJI GIICHI , HAYASHI MASAAKI , NAKAKOSHI KAZUO
IPC分类号： G11B5/012 , G11B5/02 , G11B5/09 , G11B5/31 , G11B5/39
摘要： PURPOSE:To realize a large capacity magnetic disk device by making a thin film magnetic disk to have a specific track density, line recording density and disk circumferential speed. CONSTITUTION:Plural head disk assembly, which are equipped with plural thin film magnetic disks 4 which possess the track density greater than or equal to 1,800 tracks per one inch and the line recording density greater than or equal to 70 kiro-bits per one inch on one rotational shaft, are provided. And, a thin film magnetic head 5 which the pole thickness PT, the saturated magnetic flux density BS, and a recorded wavelength lambda satisfies a inequality I when the recorded wavelength is 0.3-0.97mum. Thus a large capacity magnetic disk device can be realized.

6. 发明专利

JPH02247809A MAGNETIC DISK DEVICE AND THIN-FILM MAGNETIC HEAD MOUNTED THEREON 失效
公开(公告)号：JPH02247809A
公开(公告)日：1990-10-03
申请号：JP6623089
申请日：1989-03-20
申请人： HITACHI LTD
发明人： KAWABE TAKASHI , FUYAMA MORIAKI , NARUSHIGE SHINJI , ASHIDA EIJI , MORIJIRI MAKOTO , TANABE MASANORI , FUKUI HIROSHI , SUGITA KEN , IKEDA HIROSHI , HAYASHI MASAAKI , NAKAKOSHI KAZUO , KAWAKAMI HIROJI , SAITO SUKEO , KUWAZUKA SHUNICHIRO
IPC分类号： G11B5/012 , G11B5/31 , G11B5/39
摘要： PURPOSE:To obtain the magnetic disk device mounted with the thin-film magnetic head formed with high accuracy in hole length and track width by forming a protective film having a contact hole in the front end part of an upper magnetic film. CONSTITUTION:An upper magnetic core is bisected and the front end part 12 and a rear part 15 are connected through the contact hole 16 provided in the protective film 13 to form a magnetic circuit together with a lower magnetic film 22. The front end A of the rear part 15 of the upper magnetic film is positioned behind the point B of a gap depth 0. The purpose of such formation is to prevent the leak magnetic flux generated from the rear part 15 from affecting a recording medium. Further, the rear end D of the front end part 12 is projected from the rear end C of the contact hole 16 toward the rear of the head. The purpose of such projection is to surely connect the front end part 12 and the rear part 15 through the contact hole 16. The purpose is achieved by using such head.

7. 发明专利

JPS6350769B2 失效
公开(公告)号：JPS6350769B2
公开(公告)日：1988-10-11
申请号：JP9971287
申请日：1987-04-24
申请人： HITACHI LTD
发明人： TAKEURA TOORU , TSUCHA HIROSHI , HAYASHI MASAAKI
IPC分类号： G11B5/02 , G11B5/39 , G11B5/465

8. 发明专利

JPS6339122A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS6339122A
公开(公告)日：1988-02-19
申请号：JP17991286
申请日：1986-08-01
申请人： HITACHI LTD
发明人： SHIROISHI YOSHIHIRO , HISHIYAMA SADAO , SUZUKI HIROYUKI , TSUMITA NORIKAZU , SUGANUMA YASUO , GOHARA YOSHIO , HAYASHI MASAAKI
IPC分类号： G11B5/66 , G11B5/64 , G11B5/706 , G11B5/738
摘要： PURPOSE:To improve corrosion resistance while maintaining the excellent magnetic characteristics of a thin magnetic metallic film by consisting a magnetic layer essentially of Co, Cr and Zr and specifying the content of the Zr. CONSTITUTION:This thin magnetic alloy film consists essentially of the Co, Cr and Zr on a nonmagnetic substrate and the content of the Zr is specified to >=6wt% and =6wt%. On the other hand, the saturation magnetic flux density of the thin magnetic film is decreased when the Zr is added thereto but said density has the practically satisfactory value if the content of the Zr is

9. 发明专利

JPS6042542B2 失效
公开(公告)号：JPS6042542B2
公开(公告)日：1985-09-24
申请号：JP14789478
申请日：1978-12-01
申请人： HITACHI LTD
发明人： MAEDA MUNESHIGE , NISHIDA HIROSHI , AKYAMA YASUO , HAYASHI MASAAKI
IPC分类号： G11B17/32 , G11B5/58 , G11B21/12 , G11B21/20

10. 发明专利

JPS6074149A MAGNETIC HEAD 失效
公开(公告)号：JPS6074149A
公开(公告)日：1985-04-26
申请号：JP10049784
申请日：1984-05-21
申请人： HITACHI LTD
发明人： MAEDA MUNESHIGE , NISHIDA HIROSHI , AKIYAMA YASUO , HAYASHI MASAAKI
IPC分类号： G11B17/32 , G11B21/20
摘要： PURPOSE:To obtain normal recording and reproducing characteristics by making one of sliders have a degree of freedom of no-direction for stabilizing a surface contact of the slider and a flexible magnetic disk by gimbal flexure, and also giving a surface contact force by a load spring. CONSTITUTION:A titled magnetic head has a degree of freedom of no-direction so that a stable surface contact to a magnetic disk 1 can be executed by the operation of a gimbals 4, receives force by a load spring 3, and holds a prescribed contact pressure between itself and the magnetic disk 1. A slider 2 of the lower side in the figure has a degree of freedom of no-direction so that a stable surface contact to the magnetic disk 1 can be executed by the operation of the gimbals 4. Also, the relative height of the magnetic disk surface direction to the magnetic disk 1 is fixed by a stopper 7 installed to an arm 6. A lower side slider 2 is fixed by projecting by DELTAx, therefore, even if a deformation (waviness of the surface) of the magnetic disk 1 exists, the magnetic disk 1 follows the lower side slider 2.

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