专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

11. 发明专利

JPS634421A PRODUCTION OF MAGNETIC DISK 失效
公开(公告)号：JPS634421A
公开(公告)日：1988-01-09
申请号：JP14707086
申请日：1986-06-25
申请人： HITACHI LTD
发明人： IECHIKA KEIGO , ITO YASUSHI , KATO YOSHIKI , FUMIOKA JIYUN , MAEDA FUJIO
IPC分类号： B24B37/00 , G11B5/84
摘要： PURPOSE:To control and project high-hardness fine inorg. particulate powder to a desired height from a magnetic coated film contg. the high-hardness fine inorg. particulate powder coated on a substrate by grinding the coated film by using abrasive grains which are lower in hardness than the high-hardenss fine inorg. particulate powder and higher in hardness than the magnetic coated film. CONSTITUTION:Grinding fluid supply nozzles 1a, 1b are provided above the point where wrapping tapes 2a, 2b are held pressed to a magnetic disk 4 and the grinding fluid is kept supplied therefrom. The tapes 2a, 2b are respectively fed in the directions of arrows B, C so that always the fresh surface contact the magnetic disk 4. The high-hardness fine inorg. particulate powder 5 is incorporated into the magnetic coated film 6 on the magnetic disk substrate 4. The dislodgment of the high-hardness fine inorg. particulate powder 5 is low in the coated film state obtd. by the working; in addition, the projection height is stably obtd. up to the desired height. Alumina grains are used as, for example, the high-hardness fine inorg. particulate powder 5 and chromium oxide grains are used as the abrasive grains.

12. 发明专利

JPS58120459A SIMULTANEOUSLY GRINDING DEVICE FOR PLURAL SHEETS OF DISCS 失效
公开(公告)号：JPS58120459A
公开(公告)日：1983-07-18
申请号：JP95882
申请日：1982-01-08
申请人： HITACHI LTD
发明人： RACHI MIKIO , MARUTA MINORU , ABE AKIHIRO , HIRUTA TSUGIO , FUMIOKA JIYUN
IPC分类号： B24B7/17
摘要： PURPOSE:To simultaneously grind plural discs and to obtain desired surface roughness, by providing a grinding means in which the discs are held from both sides and moved in a radial direction of the disc. CONSTITUTION:A main body part 1 comprises a rotatively driven main shaft 2 for rotating discs 4. The disc 4 is provided with a disc holding part fiexdly held by an internal peripheral guide and a bearing box 25 rotatably supporting the disc. A disc grinding part contains grinding wheels 19 arranged in both side positions of the disc 4, cam supporting holding of the wheels 19 for the disc 4 and a shaft 14 longitudinally moving the wheel 19. A reversible motor 8 is rotated, and a linear motion bearing 13 is fitted into a shaft 32 by a feed screw 7 to approximate the disc 4 to the disc grinding part. The shaft 2 is rotated to rotate the disc 4, and the wheels 19 are uniformly operated under pressure to start a finishing work.

13. 发明专利

JP2000113440A MAGNETIC RECORDING DEVICE 失效
公开(公告)号：JP2000113440A
公开(公告)日：2000-04-21
申请号：JP31959899
申请日：1999-11-10
申请人： HITACHI LTD
发明人： ISHIKAWA AKIRA , SHIROISHI YOSHIHIRO , HOSOE YUZURU , YAMAMOTO TOMOO , YAKU YOTSUO , OZAKI AKIRA , KATO YOSHIKI , FUMIOKA JIYUN
IPC分类号： G11B5/64 , G11B5/65 , G11B5/73
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording medium which is suitable for an MR head (recording/reproduction separate type head) with a high reproducing sensitivity, which is high in write bleeding, and which can obtain a high S/N ratio. SOLUTION: A magnetic film 15, 15' is provided on a substrate 1 directly or through a metallic base film 13, 13'. Then, the product Br1δ of residual magnetization Br1, which is measured in the head running direction of the magnetic film 15, 15', and the total film thickness δ is set as 5 Gμm

14. 发明专利

JPH05305570A 失效
公开(公告)号：JPH05305570A
公开(公告)日：1993-11-19
申请号：JP31453392
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 forming an abrasive grain layer containing at least two kinds of abrasive grains different in hardness on a base member. CONSTITUTION:To grind projections on the surface of a magnetic disc with a high economic efficiency, polishing is conducted not with a necessary condition of chip pocket but by using a lapping tape having an abrasive grain layer having diamond abrasive grains 4 scattered in Al2O3 abrasive grain groups 3. To more precisely finish the surface without giving a working flaw on the surface, a lapping tape having chip pockets 2 in the abrasive grain layer 3 is used for polishing. Thus, projections on the magnetic disc surface can be polished with a high economic efficiency. Since the magnetic disc surface can be highly precisely worked, the float of a magnetic head can be reduced.

15. 发明专利

JPH05120678A PRODUCTION OF MAGNETIC DISK MEDIUM 失效
公开(公告)号：JPH05120678A
公开(公告)日：1993-05-18
申请号：JP10733292
申请日：1992-04-27
申请人： HITACHI LTD
发明人： FUMIOKA JIYUN , IMAMURA MASAAKI , KUZE TSUTOMU
IPC分类号： B24B21/00 , G11B5/84
摘要： PURPOSE:To efficiently remove the microprojections being present on a magnetic disk surface by pressing a polishing medium via a pressing member having a large inherent oscillation frequency on the surface of a rotating magnetic disk. CONSTITUTION:Contact rubber rollers 4 are held by parallel leaf springs 5 advantageous for increasing the value of a spring constant (k) and are opened/ closed on two sliding bars 8 by the action of tapered pieces 6 provided on an air cylinder 16 to pressurize the polishing tape to a disk 1. A motor plate 14 which supports driving motors 11 is disconnected from the rollers 4 and set in the position where the positional relation between the rollers 4 and a take-up roll 10 is not deviated in order to reduce the weight of the tape head system. The weight of the tape head in such constitution is the weight of the rollers 4 alone and is small and the inherent oscillation frequency of the tape head system is increased by selecting largely the spring constant k. Consequently, the follow-up property of the tape head is improved and the magnetic disk medium having the excellent surface smoothness is obtd.

16. 发明专利

JPH05284A CLEANING METHOD, METHOD FOR CLEANING PART, WASHING SLOUTION, PROCESSING TREATMENT SOLUTION, MAGNETIC RECORDING MEDIUM AND PRODUCTION THEREOF AND MAGNETIC RECORDING APPARATUS 失效
公开(公告)号：JPH05284A
公开(公告)日：1993-01-08
申请号：JP14629991
申请日：1991-06-18
申请人： HITACHI LTD
发明人： INOMATA YOICHI , OGAWA OSAMU , FUMIOKA JIYUN , KATO YOSHIKI , OURA MASAKI , OTAKE MITSUYOSHI , WATANABE MASAHIRO
IPC分类号： B08B11/00 , G11B5/84
摘要： PURPOSE:To effectively remove the shaving powder bonded to the surface of the magnetic film of a magnetic recording medium by rubbing the surface of an objective part with a washing solution containing fine particles while supplying the solution to the objective part to move the shaping powder bonded to the surface of the objective part or to adsorb the shaving powder itself to disperse the shaving powder in a treatment solution. CONSTITUTION:The surface of an objective part is rubbed with a washing solution containing fine particles 16 with a mean particle size of 1mum or less such as Al2O3 fine particles while the washing solution is supplied to the objective part to move the fine shaving powder 9 bonded to the surface of the objective part by the bonding energy of the fine particles 16 dispersed in the treatment 5 liquid of the washing solution or the high following properties thereof in surface fine uneven parts of the objective part or to adsorb the shaving powder 9 itself to disperse the bonded powder in the treatment solution. As a result, the bonded shaving powder 9 can be effectively removed from the surface of the magnetic film of a magnetic recording medium.

17. 发明专利

JPH03116416A PRODUCTION OF MAGNETIC DISK MEDIUM 失效
公开(公告)号：JPH03116416A
公开(公告)日：1991-05-17
申请号：JP10999590
申请日：1990-04-27
申请人： HITACHI LTD
发明人： FUMIOKA JIYUN , IMAMURA MASAAKI , KUZE TSUTOMU
IPC分类号： G11B5/84 , G11B5/62 , G11B5/73
摘要： PURPOSE:To uniformly remove only fine projections from the surface of a medium at high efficiency by using polishing tapes and specifying the circumferencial speed of the medium to be processed and the pressure given on the tapes for processing. CONSTITUTION:A pair of contact rubber rollers 4 supported by parallel leaf springs 5 are opened or closed on two slide bars 8 by movement of a tapered top 6 attached to an air cylinder 16 and the rollers press polishing tapes on the both sides of a disk 1. The disk medium rotates at the circumferential speed of >=250m/min and is processed by the tapes at the pressure of . Namely, the tape head structure used here is a light-weight type, in which a driving motor 11 to travel the polishing tape is separated from the contact rubber roller. Thereby, only fine projections on the medium can be uniformly and efficiently removed.

18. 发明专利

JPH0349859A METHOD FOR DETECTING GRINDING SPEED AND FOR TAPE GRINDING WORK, AND METHOD AND DEVICE FOR MANUFACTURING MAGNETIC DISK 失效
公开(公告)号：JPH0349859A
公开(公告)日：1991-03-04
申请号：JP18463389
申请日：1989-07-19
申请人： HITACHI LTD
发明人： KAWAMURA YOSHIO , KAWAKUBO YOICHI , HORIUCHI YASUAKI , FUMIOKA JIYUN , ITO YASUSHI , MORITA KENJI
IPC分类号： B24B21/00 , G11B5/84
摘要： PURPOSE:To discriminate a work condition for whether it is good or bad in the real time without performing sampling inspection of work-finished disks by measuring a work residual quantity by a grinding means and specifying a work speed with a grinding condition for a workpiece. CONSTITUTION:A workpiece (magnetic disk) 1 is ground by grinding tapes 9, and a work residual quantity, which adheres to a position of these grinding tapes 9, is measured as a quantity of light from a light receiver 11 and displays for the work time. A work speed is grasped by measuring a contact time of the grinding tape 9 with the workpiece under a condition not more than the adhering saturation time of work residue to this grinding tape 9, and a work condition is discriminated for whether it is good or bad by the real time.

19. 发明专利

JPS6399170A POLISHING DEVICE 失效
公开(公告)号：JPS6399170A
公开(公告)日：1988-04-30
申请号：JP24292586
申请日：1986-10-15
申请人： HITACHI LTD
发明人： KAWAMURA YOSHIO , KAWAKUBO YOICHI , KANETOMO MASABUMI , MORITA KENJI , KATO SHIGEO , FUMIOKA JIYUN , ITO YASUSHI
IPC分类号： B24B21/00
摘要： PURPOSE:To enable a device to efficiently perform polishing using polishing tapes of large width, by providing a means, which pressurizes a back surface of the polishing tape with desired distribution, and performing the polishing to be controlled so that its speed obtains a desired value. CONSTITUTION:Polishing tapes 2, 12, wound by winding mechanisms 5, 15, are arranged on a picture of a magnetic disc 1, which is a work, further held by pressurizing parts 3, 13. These pressurizing parts 3, 13, providing two rows of three throttle holes 32 to be drilled over the magnetic disc 1 from its internal peripheral p[arts Ri to peripheral part Ro, form a pressurizing chamber 31 on a surface brought into contact with the polishing tapes 2, 12 in the bottom end of said holes, and a polishing device, which respectively introduces fluid pressures P1-P6 suitably set by a pressurizing force regulating system 4, uniformly presses the polishing tapes 2, 12 to the magnetic tape 1. Under this condition, the device, rotating the magnetic disc 1 in a desired rotary speed, performs polishing. In this way, a surface of optional shape of the work can be efficiently further high accurately polished by using the polishing tape of large width.

20. 发明专利

JPS53147512A DISC FINISHING DEVICE 失效
公开(公告)号：JPS53147512A
公开(公告)日：1978-12-22
申请号：JP6219877
申请日：1977-05-30
申请人： HITACHI LTD
发明人： FUMIOKA JIYUN , ENDOU MITSUSHI
IPC分类号： B24B19/00 , B24B35/00 , G11B5/84
摘要： PURPOSE:To evenly finish both surfaces of a magnetic disc to a specified film thickness in one process by reciprocating grindstones in the radial direction of a disc and applying radial vibtations to the grindstones.

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