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1. 发明专利

JPH05324208A STORAGE DEVICE 失效
公开(公告)号：JPH05324208A
公开(公告)日：1993-12-07
申请号：JP12641092
申请日：1992-05-19
申请人： FUJITSU LTD
发明人： NAKAHARA TAKESHI , NARUMI TOSHIKATSU , SUZUKI HIROSHI , NAKADA MASAHIRO
IPC分类号： G06F3/06
摘要： PURPOSE:To shorten the retrieval and read time of a file by arranging plural information recording parts in the data area of a recording medium and moving a head to one of the information recording parts according to the position of the head. CONSTITUTION:The data area 1 is formed on the recording medium 11, and a block 2 for storing data and information recording parts 3a and 3b where control information for controlling the block 2 is recorded at the head and tail parts are arranged in the data area 1. Therefore, when the head 4 is positioned on one of the blocks in the data area 1, a control part 12 moves the head 4 to the information recording part 3a or 3b closer to the position of the head 4. Consequently, even if the block 2 where the head 4 is positioned is at a maximum distance from the information recording parts 3a and 3b where the file control information is recorded, the quantity of movement of the head 4 to the information recording parts 3a and 3b becomes >=1/2 as large as before.

2. 发明专利

JPH05205397A OPTICAL DISK 失效
公开(公告)号：JPH05205397A
公开(公告)日：1993-08-13
申请号：JP1133392
申请日：1992-01-24
申请人： FUJITSU LTD
发明人： SUZUKI HIROSHI , NARUMI TOSHIKATSU , NAKADA MASAHIRO , NAKAHARA TAKESHI , INOUE KUMIKO
IPC分类号： G11B7/007 , G11B7/0055 , G11B20/00 , G11B20/12 , G11B27/00
摘要： PURPOSE:To prevent copying by providing a region for writing essential data, a dummy region for writing dummy data and a specified sector for writing the copying range. CONSTITUTION:A magnetooptical disk is provided with a specific sector S0 in an inaccessible region 20 for which the dummy region 12 and the range to be copied are written. When the copying command is issued, at first the specific sector S0 in the inaccessible region 20 is made access. In this sector the range to be copied is designated (i.e., whole data), the copying is impossible since the capacity is over in the storage means of an usual personal computer.

3. 发明专利

JPH04121843A PRODUCTION OF OPTICAL DISK 失效
公开(公告)号：JPH04121843A
公开(公告)日：1992-04-22
申请号：JP24206790
申请日：1990-09-11
申请人： FUJITSU LTD
发明人： IMAMURA FUMINORI , MORIBE MINEO , IWAMURA YASUMASA , NAKAJIMA HIDEKAZU , NARUMI TOSHIKATSU
IPC分类号： G11B23/00 , G11B7/26
摘要： PURPOSE:To decrease the man-hours required for adhering hubs by integrally molding the hubs as well as the time of injection molding of substrates. CONSTITUTION:The optical disk substrate 4 with which the pats of the hubs 3 and the substrates 1 are integrated by simultaneously and integrally molding the parts of the hubs 3 at the time of injection molding a synthetic resin is used. The disk 4 and the hubs 3 are integrally molded by using the same materials at this time and thereafter, a magnetic metallic plate is fixed in the recessed part provided in the hubs 3. The centering stage and adhering stage for the hub are then saved and, therefore, the drastic reduction of the stages is possible.

4. 发明专利

JPH0352646B2 失效
公开(公告)号：JPH0352646B2
公开(公告)日：1991-08-12
申请号：JP16675183
申请日：1983-09-12
申请人： FUJITSU LTD
发明人： NARUMI TOSHIKATSU , SUENAGA TADATOSHI , MAEDA MYOZO , FUKUSHIMA SHIGERU , TAKAHASHI JUN
IPC分类号： G11B5/84

5. 发明专利

JPH03178061A OPTICAL DISK 失效
公开(公告)号：JPH03178061A
公开(公告)日：1991-08-02
申请号：JP31831189
申请日：1989-12-07
申请人： FUJITSU LTD
发明人： MORIBE MINEO , NARUMI TOSHIKATSU , IMAMURA FUMINORI , IWAMURA YASUMASA
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To form a protective film having lubricity to an electromagnet and to attain the driving method (CSS) of a floating magnetic head by constituting the protective film of a copolymer which consists of an acrylic resin and a silicone resin having a methacrylic acid group, etc., at the terminal and is polymerized by UV rays. CONSTITUTION:The recording medium 2 has the magneto-optical recording characteristics that the medium attains a Curie temp. by irradiation with light and the magnetization is inverted by the magnetic field impressed from the electromagnet 4. The protective film 5 is provided on the recording medium 2 and is constituted of the copolymer formed by consisting the chief material of the acrylic resin of a UV curing type and the additive of the silicone resin substd. with the methacrylic group of the UV curing type and curing both by the UV rays. The protective film 5 obtd. in such a manner has the good slip to the electromagnet of the floating magnetic head, etc., and attains the CSS. The protective film 5 having the extremely high durability is thus formed. The CSS control is executed by forming the electromagnet into the floating magnetic head type.

6. 发明专利

JPH03142701A HEAD FOR MAGNETO-OPTICAL DISK 失效
公开(公告)号：JPH03142701A
公开(公告)日：1991-06-18
申请号：JP28225689
申请日：1989-10-30
申请人： FUJITSU LTD
发明人： NARUMI TOSHIKATSU , IMAMURA FUMINORI , MORIBE MINEO
IPC分类号： G11B11/10 , G11B5/02 , G11B11/105
摘要： PURPOSE:To improve recording characteristics by providing a magnetic field generating part holding plate which consists of a resin film and holds a magnetic field generating part near a laser beam focusing position in such a manner that the laser beam is not shielded and bringing the magnetic field generating part near to the recording medium without impairing the recording medium. CONSTITUTION:An optical head 20 contg. at least a laser light source 5 and an optical system 6 which focuses the laser beam emitted from the laser light source 5 to the prescribed position on the recording medium 1 positioned on the outer part and the annular magnetic field generating part 24 which has a hole 21a to obviate the shutting of the laser beam in the central part are provided. The magnetic field generating part holding plate 21 made of the resin film which is fixed to the optical head 20 and holds the magnetic field generating part 24 near the laser beam focusing position so as not to shield the laser beam is provided. Even if the magnetic field generating part 24 and eventually the front end of bellows come into contact with the recording medium, the bellows part 21c absorbs the contact force thereof and, therefore, the above-mentioned contact part easily retreats and does not break the recording medium. The head for magneto-recording disks having the good recording characteristics is obtd. in this way.

7. 发明专利

JPH0246579A MAGNETIC HEAD 失效
公开(公告)号：JPH0246579A
公开(公告)日：1990-02-15
申请号：JP19681288
申请日：1988-08-05
申请人： FUJITSU LTD
发明人： NARUMI TOSHIKATSU , FUKUSHIMA SHIGERU , NANBA YOSHIYUKI
IPC分类号： G11B21/21
摘要： PURPOSE:To prevent a head crush by forming groove parts on a peripheral part of a slider to be approximately orthogonal to the moving direction of the slider and also continuous until both ends of the slider. CONSTITUTION:Protrusion parts 11b and 1c are extendedly situated in the direction of a tangential line to a track of a disk, and this extended direction is approximately orthogonal to the moving direction of the slider 11 during a track seeking time. And, the groove parts 13a-13d are formed on the protrusion parts 11b and 11c along its extended direction. That is, in the case of a collision between the peripheral part of the slider and a disk surface, shock force of the collision given to this peripheral part acts as deforming force for narrowing the groove parts. By this method, since the shock force of the collision is released, a magnetic film on the disk surface is not damaged, and then the head crush is hence suppressed.

8. 发明专利

JPS63237239A MAGNETO-OPTICAL DISK 失效
公开(公告)号：JPS63237239A
公开(公告)日：1988-10-03
申请号：JP7072387
申请日：1987-03-25
申请人： FUJITSU LTD
发明人： TAKAHASHI JUN , FUKUSHIMA SHIGERU , NARUMI TOSHIKATSU , ITO KENICHI , OGAWA SEIYA
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To permit over writing by using a magnetic head to impress a magnetic field to a magneto-optical disk formed with a 1st protective film, recording film and 2nd protective film on a transparent substrate and providing a protective film for head crush resistance on the 2nd protective film. CONSTITUTION:The magneto-optical disk 14 is formed by laminating the 1st protective film 9, the recording film 10 and the 2nd protective film 11 on the transparent substrate 8. The disk 14 formed in such a manner is fixed to a spindle 15 and rotates at a high speed. On the other hand, the laser light from a light source 16 is condensed by a lens and is projected on the recording film of the disk 14. The magnetic head 1 floating apart a slight distance from the disk exists on the side opposite from the irradiated position to impress the magnetic field perpendicularly to the irradiated position. The over writing and the high-speed information processing are thereby permitted.

9. 发明专利

JPS63153773A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS63153773A
公开(公告)日：1988-06-27
申请号：JP30211986
申请日：1986-12-17
申请人： FUJITSU LTD
发明人： NARUMI TOSHIKATSU , FUKUSHIMA SHIGERU , TAKAHASHI JUN
IPC分类号： G11B21/21 , G11B5/455
摘要： PURPOSE:To easily detect the presence or absence of harmful head touch at the shipping inspection after the completion of assembly of a magnetic disk device by fitting a vibration propagation rod provided with an electromechanical conversion element through the hole of a magnetic disk device dust-proof cover to a head fixed arm. CONSTITUTION:A tap hole is provided to the fixed arm 3 of the head 2 in opposition to the track of the magnetic disk 1 at a fine gap. A seat 7 mounting the electromechanical conversion element 15 is provided to the head of the vibration propagation rod 5 and a screw coincident with the thread hole is provided to the tip. The vibration propagation rod is inserted from the hole 10 of the dust-proof cover 9 and screwed and fixed to the tap hole of the head fixed arm. The electromechanical conversion element is adhered to the seat 7 of the vibration propagation rod and the abnormal vibration of the head fixed arm is detected. By such a constitution, the presence or absence of the harmful head touch is detected easily by the shipping inspection after the completion of assembly of the magnetic disk device.

10. 发明专利

JPS62214523A PRODUCTION OF MAGNETIC DISK 失效
公开(公告)号：JPS62214523A
公开(公告)日：1987-09-21
申请号：JP5687986
申请日：1986-03-17
申请人： FUJITSU LTD
发明人： TAKAHASHI JUN , FUKUSHIMA SHIGERU , NARUMI TOSHIKATSU
IPC分类号： G11B5/72 , C09D5/23 , C09D133/04 , C09D133/08 , C09D161/04 , C09D161/06 , C09D163/00 , C10M105/22 , C10N40/18 , G11B5/725 , G11B5/84 , G11B5/842
摘要： PURPOSE:To improve the strength of the coated film of a disk by bringing a titanate coupling agent and lubricating agent having a carboxyl group into reaction in the coated film. CONSTITUTION:A magnetic coating compd. is prepd. by kneading magnetic powder, thermosetting resin, solvent and titanate coupling agent and such magnetic material is coated on a disk substrate to form the coated film, then the substrate is heated. The thermosetting resin is thereafter subjected to primary baking under unreaction conditions and after the lubricating agent having the caboxyl group is coated thereon, the substrate is again heated and the coating is baked under the conditions under which the thermosetting resin in the coated film cures thoroughly.

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