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1. 发明专利

JP2000048358A PRODUCTION OF MAGNETIC RECORD MEDIUM 失效
公开(公告)号：JP2000048358A
公开(公告)日：2000-02-18
申请号：JP23344899
申请日：1999-08-20
申请人： HITACHI LTD
发明人： ISHIKAWA AKIRA , HOSOE YUZURU , SHIROISHI YOSHIHIRO , TAKESHITA MASATOSHI , YAKU YOTSUO , YAMAMOTO TOMOO , OZAKI AKIRA , TANAHASHI KIWAMU , FUMIOKA JIYUN , KATO YOSHIKI , OURA MASAKI
IPC分类号： G11B5/738 , G11B5/65 , G11B5/82 , G11B5/84
摘要： PROBLEM TO BE SOLVED: To permit stable running of a head and to enhance S-N ratio in high density recording by forming an underlayer comprising Cr, Mo, W, Nb, Ta or an alloy based on these in a specified thickness between a nonmagnetic disk substrate and a magnetic layer. SOLUTION: An underlayer comprising Cr, Mo, W, Nb, Ta or an alloy based on these is formed in 5-500 nm thickness on a substrate and crystals are grown under orientation so that the (100) or (110) crystal lattice faces of the underlayer are made parallel to the substrate to enhance magnetic anisotropy in the running direction of a head. A magnetic layer preferably comprises Co, Fe, Ni or an alloy based on these and it is preferable that crystals are grown under orientation so that the (110) crystal lattice faces of the magnetic layer are made almost parallel to the substrate because magnetic anisotropy is enhanced by the growth. When a layer of a carbide such as WC or (W-Mo)C is used as a protective layer, sliding and corrosion resistances can be enhanced.

2. 发明专利

JPH0737237A MAGNETIC RECORDING MEDIUM AND ITS PRODUCTION AND MAGNETIC RECORDER 失效
公开(公告)号：JPH0737237A
公开(公告)日：1995-02-07
申请号：JP18101593
申请日：1993-07-22
申请人： HITACHI LTD
发明人： ISHIKAWA AKIRA , SHIROISHI YOSHIHIRO , HOSOE YUZURU , YAMAMOTO TOMOO , YAKU SHINAN , OZAKI AKIRA , KATO YOSHIKI , FUMIOKA JIYUN
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/72 , G11B5/738 , G11B5/85 , G11B5/851
摘要： PURPOSE:To provide the magnetic recording medium which is adaptive to an MR head having a high reproducing sensitivity and has a large writing blur quantity and with which high S/N is obtainable. CONSTITUTION:The surface of a substrate 11 is provided with magnetic films 15, 15' directly or via metallic ground surface films 13, 13'. The value of the product Br1 delta of the residual magnetization Br1 measured in the head traveling direction of the magnetic films and the total film thickness delta thereof is specified to >=5 to $180Gmum. The value of the ratio Br1/Br2 of Br1 and the residual magnetization Br2 measured in the direction parallel with the substrate surface and perpendicular to the head traveling direction is specified to >=1.3 to

3. 发明专利

JPH05305569A 失效
公开(公告)号：JPH05305569A
公开(公告)日：1993-11-19
申请号：JP31453292
申请日：1992-11-25
申请人： HITACHI LTD
发明人： ITO YASUSHI , IMAMURA MASAAKI , KATO YOSHIKI , FUMIOKA JIYUN
IPC分类号： B24B21/00 , B24D3/00 , B24D11/00 , G11B5/84
摘要： PURPOSE:To polish projections on a magnetic disc surface with a high economic efficiency by using an abrasive member having an abrasive grain layer containing at least two kinds of abrasive grains different in hardness. CONSTITUTION:By using an abrasive member having an abrasive grain layer containing at least two kinds of abrasive grains different in hardness, the surface of a material to be polished is polished. At this time, an abrasive grain 1 is formed of diamond 4 and a material lower in hardness than the diamond 4 (for example, Al2O3 or SiC). The base member of the abrasive member is formed into a film, and recessed parts are formed between the mutual abrasive grains 1 on the abrasive grain surface of the abrasive member. Thus, projections on a magnetic disc surface can be polished with a high economic efficiency, and the magnetic disc surface can be highly precisely machined.

4. 发明专利

JPS632661A TAPE GRINDING DEVICE 失效
公开(公告)号：JPS632661A
公开(公告)日：1988-01-07
申请号：JP14483786
申请日：1986-06-23
申请人： HITACHI LTD
发明人： KANETOMO MASABUMI , KAWAKUBO YOICHI , KAWAMURA YOSHIO , FUMIOKA JIYUN , ITO YASUSHI
IPC分类号： B24B21/00
摘要： PURPOSE:To keep the tension of a tape constant and carry out flattening machining with high accuracy by installing a brake and a tachometer on a tape feed reel shaft and a tachometer on a capstan shaft on which a tape driving motor is provided, and controlling said brake with the signals of both tachometers. CONSTITUTION:The braking torque of a brake 3 installed on a tape feed reel shaft 2 is controlled by the signals of a tachometer 7 installed on a capstan shaft 6 and a tachometer 8 installed on the tape feed reel shaft 2. A tape 1 is fed in the direction of the arrow 9 by means of a driving motor 10 and the speed of the tape 1 can be measured by the tachometer 7 installed on the capstan shaft 6. Also, by measuring the rotating speed of a tape feed reel 4, the remaining quantity of a tape diameter at that time can be known from the tape speed. Here, by varying the braking torque of, i.e., a voltage to be applied to, the brake 3, the tension of the tape 1 can be made constant regardless of the remaining quantity of the tape. Accordingly, the flattening machining of a magnetic film surface coated on a magnetic disk can be carried out with high accuracy.

5. 发明专利

JPS61241056A MANUFACTURE OF MAGNETIC DISK BASE PLATE 失效
公开(公告)号：JPS61241056A
公开(公告)日：1986-10-27
申请号：JP7834085
申请日：1985-04-15
申请人： HITACHI LTD
发明人： INOMATA YOICHI , IMAMURA MASAAKI , MAEDA FUJIO , FUMIOKA JIYUN
IPC分类号： G11B5/84 , B24B21/04 , B24B37/00
摘要： PURPOSE:To have flat and uniform application of magnetic coating by removing foreign objects to form a base plate having dints at its surfaces, subjecting the surfaces to a process of mechanochemical polishing, and thereby providing a flat and smooth base plate. CONSTITUTION:Both sides of a base plate 10' prepared in a advance from aluminum alloy are polished b a tape polishing device, and intermetal compound 11 included in the plate 10' is removed to form a base plate 10' having dints 12 at its surfaces. Both sides of this base plate 10' with dints 12 are polished by a mechanochemical polishing device until the surfaces are free of dints 12 so as to provide a flat and smooth base plate 10. A magnetic coating 13 including spherical fillers 14 as a magnetic coating reinforcing agent is applied to each side of this base plate 10 through a process of spin coating etc. to accomplishing a magnetic disk. The disk thus produced is equipped with uniform and flat magnetic films, which provided it with capability of recording with higher density.

6. 发明专利

JPS59148134A Production of magnetic disk medium 失效
标题翻译：磁碟制作
公开(公告)号：JPS59148134A
公开(公告)日：1984-08-24
申请号：JP2148183
申请日：1983-02-14
申请人： Hitachi Ltd
发明人： FUMIOKA JIYUN , IMAMURA MASAAKI , KUZE TSUTOMU
IPC分类号： G11B5/84 , B24B21/00 , G11B5/82 , G11B23/50
CPC分类号： G11B5/82
摘要： PURPOSE:To eliminate effectively only microprojections on the surface of a magnetic disk medium by setting the peripheral speed and the processing pressure of the medium at a prescribed level respectively by means of a polishing tape after processing the surface of the medium with the polishing tape. CONSTITUTION:The disk 1 of a magnetic disk medium is chucked by a spindle and turned. Contact rubber rollers 4 are held by parallel plate springs 5 which are effective to increase the value of spring contact K. These rollers 4 open and close on two slide bars 8 by the function of a tapered core 6 provided to an air cylinder 16 and press a polishing tape having =250m/min and with processing pressure set for the tape 12. Thus it is possible to delete only microprojections existing on the surface of the disk 1.
摘要翻译：目的：为了通过在用研磨带处理介质的表面之后，通过研磨带将介质的圆周速度和处理压力分别设定在规定的水平，以有效地消除磁盘介质表面上的微喷射。构成：磁盘介质的盘1由主轴夹紧并转动。接触橡胶辊4由平行板弹簧5保持，这有助于增加弹簧接触K的值。这些辊4通过设置在气缸16上的锥形芯6的功能而在两个滑杆8上打开和关闭，并且按压具有<= 15mm的抛光带。然后盘1被抛光，圆盘1的圆周速度设定为> = 250m / min，并且以<= 50g / mm。<2>设置用于带12的处理压力。因此可以仅删除存在于磁盘1的表面上的微喷射。

7. 发明专利

JPH06231442A THIN FILM MAGNETIC DISK AND ITS PRODUCTION 失效
公开(公告)号：JPH06231442A
公开(公告)日：1994-08-19
申请号：JP1449293
申请日：1993-02-01
申请人： HITACHI LTD
发明人： OTAKE MITSUYOSHI , WATANABE MASAHIRO , NAKAMURA TAKAO , FUMIOKA JIYUN , TAKEO NORIYUKI , FURUSAWA KENJI
IPC分类号： G11B5/66 , G11B5/65 , G11B5/738 , G11B5/84
摘要： PURPOSE:To eliminate burrs and projections of a disk and to easily clean the disk after treatment by removing grooves formed by texturing of the surface of a Ni-P substrate and specifying the surface roughness of the plate CONSTITUTION:An aluminum substrate 1 (a) is used as a disk substrate, on which a Ni-P plating film 2 is formed to 10-30mum thickness by electroless plating (b). The surface of the plating film 2 is polished with a processing liquid containing an abrasive powder (c), and then cleaned to remove residual matter (d). Then the surface is treated with a surface treating liquid and treating cloth in the circumferencial direction (e). The residue after the treatment is washed out (f), and then a Cr base layer 3, Co magnetic film 4, and C protective film 5 of specified thickness are successively formed on the surface of the substrate 8 by sputtering (g). Further, dust or projections produced in this film forming process are treated with a surface processing machine using only a tape (h). No processing liquid is used. Then the surface is controlled by exposing to an atmosphere of satd. vapor pressure (i) so that a lubricant film can be easily adhered to the surface. A lubricant 6 is applied (j) and the disk is subjected to finish inspection (k). Since no burr or projection is produced in the process of surface treatment (e) or in other processes, nor abrasive powder is used, good cleaning can be easily done after treatment.

8. 发明专利

JPH064861A PRODUCTION OF THIN FILM MAGNETIC DISK 失效
公开(公告)号：JPH064861A
公开(公告)日：1994-01-14
申请号：JP16448192
申请日：1992-06-23
申请人： HITACHI LTD
发明人： OTAKE MITSUYOSHI , NAKAMURA TAKAO , FUMIOKA JIYUN , TAKEO NORIYUKI , WATANABE MASAHIRO
IPC分类号： G11B5/84
摘要： PURPOSE:To impart magnetic anisotropy by subjecting a plane substrate to surface treatment in the circumferential direction without carrying out texturing. CONSTITUTION:In a surface treating process before a film forming process, the surface of an Ni-P substrate 8 is wetted with a hydrophilic surface treating liq. 7 having etching action, a treating tape 9 is pressed against the wetted surface by means of a contact roll 10 and the substrate 8 is rotated to carry out surface treatment. Since only this surface treatment is carried out without using a machining liq. contg. abrasive grains or abrasive powder, washing after treatment is made easy. By the surface treatment, magnetic anisotropy is impated and the floating characteristics of a head are improved.

9. 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.

10. 发明专利

JPS63193326A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPS63193326A
公开(公告)日：1988-08-10
申请号：JP2481487
申请日：1987-02-06
申请人： HITACHI LTD
发明人： SUGAWARA SHUICHI , FUMIOKA JIYUN
IPC分类号： G11B5/72 , C09D171/02 , C10M107/38 , C10N20/00 , C10N40/18 , G11B5/725 , G11B5/73
摘要： PURPOSE:To impart necessary sliding resistance strength to the surface of a coating compd. coated on a substrate and to prevent attraction between a magnetic head and the surface lubricating agent of a magnetic recording medium by coating the surface lubricating agent in the form of speckles onto the surface of said coating compd. CONSTITUTION:The surface lubricating agent 5 is coated in the form of speckles on the surface of the coating compd. coated on the substrate 1. Namely, the coating compd. formed of a solvent, filler 2, magnetic material 3 and binder 4 by kneader kneading ball mill kneading filtering stages is uniformly coated on the surface of the aluminum substrate 1 finished to a specular surface by diamond grinding. The surface lubricating agent 5 is further coated in the form of speckles on the surface of the coating compd. after the coating compd. is subjected to orienting, curing and working of the coated film. The coating of the surface lubricating agent 5 to a required thickness on the coating compd. and the reduction of the effective contact area of the magnetic head and the surface lubricating agent 5 of the magnetic recording medium are, therefore, possible. The necessary sliding resistance strength is thus imparted to the coating compd. by thick coating of the surface lubricating agent 5 thereon and the attraction of the magnetic head and the surface lubricating agent 5 of the magnetic recording medium is prevented.

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