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1. 发明专利

JPH04313811A MAGNETIC RECORDING MEDIUM 失效
公开(公告)号：JPH04313811A
公开(公告)日：1992-11-05
申请号：JP40151690
申请日：1990-12-12
申请人： KONISHIROKU PHOTO IND , TOSHIBA CORP
发明人： GOTO SHIGETO , ISSHIKI MASANORI , SASAKI KUNITSUNA , SEKIGUCHI NOBUYUKI , TAKAHASHI HIDEKI
IPC分类号： B32B7/02 , B32B7/12 , B32B27/04 , B32B27/18 , B32B33/00 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/06 , G11B5/706 , G11B5/716 , G11B5/73
摘要： PURPOSE:To improve electromagnetic conversion characteristics by incorporating ferromagnetic metallic powder and/or hexagonal magnetic powder into the uppermost magnetic layer of a nonmagnetic base, incorporating Co-contg. iron oxide into other layers and selecting the thickness and surface roughness of the uppermost layer. CONSTITUTION:The magnetic layer 2, 4 formed by dispersing the magnetic powder into a binder resin are superposed on the base consisting of the film-or disk-shaped polyethylene terephthalate base. The Ba-ferrite magnetic powder of a hexagonal system is used for the uppermost layer 4. The constitutional formula thereof is expressed by BaO.n[Fe1-mMm)2]3, where (m)>0.36, Co+Zn=0.08 to 0.3, Co/Zn=0.5 to 10, (n)=5.4 to 6.0; M is the combined particles of >=2 kinds of elements, the average number of which is 3. The layer 2 contains the Co-contg. magnetic FeOx(4/3

2. 发明专利

JPH07176163A TAPE CARTRIDGE 失效
公开(公告)号：JPH07176163A
公开(公告)日：1995-07-14
申请号：JP31855193
申请日：1993-12-17
申请人： TOSHIBA CORP
发明人： ISSHIKI MASANORI
IPC分类号： G11B23/087
摘要： PURPOSE:To eliminate such a state that a case main body is damaged and it becomes unsightly as it abuts on a positioning member to the utmost. CONSTITUTION:When a cover 14 arrives at the prescribed position of a magnetic recording or reproducing device, the positioning member enters the inside of the notched parts 22a and 22b of the cover 14 and abuts on the tip surfaces 24a and 24b of projecting pieces 23a and 23b integrally formed with the case main body 11. Then, the pressing depth of a tape cartridge is regulated. Since recessed parts 25a and 25b are formed around the pieces 23a and 23b, the positioning member is not caught by the recessed parts 25a and 25b and only the tip surfaces 24a and 24b of the pieces 23a and 23b are damaged caused by the abutting on the positioning member. Even the damage caused on the tip surfaces 24a and 24b of the pieces 23a and 23b becomes inconspicuous by the shadow of the recessed parts 25a and 25b and the unsightly state is reduced. Even when the recessed parts 25a and 25b are damaged, the unsightly state is not conspicous because they are formed to be recessed. Then, the appearance is excellently maintained.

3. 发明专利

JPH0419815A MULTI-FREQUENCY SUPERPOSED MAGNETIC RECORDING SYSTEM 失效
公开(公告)号：JPH0419815A
公开(公告)日：1992-01-23
申请号：JP12269890
申请日：1990-05-11
申请人： TOSHIBA CORP
发明人： ISSHIKI MASANORI , OGUCHI TOSHIHIKO
IPC分类号： G11B5/716 , C09D5/23 , C09D7/12 , G11B5/02
摘要： PURPOSE:To satisfactorily record and reproduce the magnetic recording signals of both short and long wave areas superposed on each other by using a 1st magnetic layer (lower layer) containing the needle-shaped ferromagnetic powder and a 2nd magnetic layer (upper layer) containing the hexagonal ferromagnetic powder to form a magnetic recording medium and at the same time specifying the thickness of the 2nd magnetic layer. CONSTITUTION:A magnetic recording medium consists of a 1st magnetic layer containing the needle-shaped ferromagnetic powder and a 2nd magnetic layer containing the hexagonal ferromagnetic powder. The thickness of the upper layer (2nd magnetic layer) is set under the magnetization penetrating thickness 1/2lambdamin which the maximum output is secured for at least a high frequency signal especially a short wave length signal lambdamin. As a result, the magnetization penetration is surely attained with the lower layer (1st magnetic layer) that is easily magnetized within a surface for a low frequency signal superposed on a high frequency signal. Thus both high and low frequency signals are obtained at high output levels.

4. 发明专利

JPH01245402A MAGNETIC RECORDING DEVICE 失效
公开(公告)号：JPH01245402A
公开(公告)日：1989-09-29
申请号：JP7380088
申请日：1988-03-28
申请人： TOSHIBA CORP
发明人： KOMIYAMA KOZO , ISSHIKI MASANORI
IPC分类号： G11B5/02
摘要： PURPOSE:To always control a recording current to the optimum value corresponding to the temperature of a magnetic recording medium by detecting the temperature of the medium or its vicinity and generating a coefficient output corresponding to the kind of the medium, and then, controlling the recording current based on the coefficient output. CONSTITUTION:A temperature detector 4 detects the temperature T of a magnetic recording medium 3 and the detected output of the detector 4 is inputted to a coefficient converter 5 where the detected output is converted into a coefficient KT corresponding to the kind of the medium 3. Based on the coefficient KT, the amplification degree of a recording amplifier 1 is controlled through a recording current control circuit 6. Therefore, a recording current (is) is controlled to the optimum value in corresponding to the temperature dependency of the coercive force of the recording medium 3.

5. 发明专利

JPS63175229A MAGNETIC TRANSFER SYSTEM 失效
公开(公告)号：JPS63175229A
公开(公告)日：1988-07-19
申请号：JP690287
申请日：1987-01-14
申请人： TOSHIBA CORP
发明人： MIYAZAKI MASATOSHI , SAITOU FUSAKATSU , ISSHIKI MASANORI
IPC分类号： G11B5/86
摘要： PURPOSE:To prevent the copying variance by securing the coincidence between the center of a master medium and that of a slave medium with use of a means which prescribes the outer circumferences of those media. CONSTITUTION:A floppy disk 2 serving as a slave medium is put on a disk- shaped master medium having the same diameter as the disk 2. The hub holes 3a and 3b of the disk 2 are fitted at a center spindle 1c and a driving spindle 1d provided at a recess part 1b of a tray 1. Thus the disk 2 is put on the tray 1 and a disk-shaped master medium 100 is put on the disk 2. These disk media 9 and 10 fixed with pressure to the tray 1 via press-contact rings 4 and 5. Then the transfer magnetic fields are applied to both media 9 and 10 via magnetic field coils 6 and 7. Thus the magnetic information on both media 9 and 10 are simultaneously transferred magnetically on both sides of the disk 2. In this case both master media 9 and 10 are pressed repetitively to each other and therefore the thickness of each of both media 9 and 10 is increased compared with that of the disk 2. In such a way, the center variance is prevented among those disk 2 and both media 9 and 10 respectively.

6. 发明专利

JPH06180440A HOUSING AND CARRYING CONTAINER FOR LIQUID CRYSTAL DISPLAY PANEL 失效
公开(公告)号：JPH06180440A
公开(公告)日：1994-06-28
申请号：JP33294592
申请日：1992-12-14
申请人： TOSHIBA CORP , IBM JAPAN
发明人： ISSHIKI MASANORI , AIDA YUJI
IPC分类号： B65G57/00 , B65D85/86 , G02F1/13
摘要： PURPOSE:To house and carry a liquid crystal display panel without causing dielectric breakdown or mechanical damage. CONSTITUTION:The main part of a housing and carrying container for a liquid crystal display panel is constituted of a holding member 105, a bottom part holding member 107, a holding member 109 and a panel housing guide member 111 which hold the rectangular liquid crystal display panel 101 so that they are not brought into contact with an electrode for connection 103 formed at the circumferential edge part of the panel 101; and a sealing housing 117 which consists of a cover body 113 and a main body 115 and houses the panel 101 having a rectangular shape and the respective holding members inside.

7. 发明专利

JPH04123312A MAGNETIC RECORDING MEDIUM FOR MASTER 失效
公开(公告)号：JPH04123312A
公开(公告)日：1992-04-23
申请号：JP24356190
申请日：1990-09-13
申请人： TOSHIBA CORP
发明人： ISSHIKI MASANORI
IPC分类号： G11B5/706 , C09D5/23 , C09D7/12
摘要： PURPOSE:To improve the output characteristics of short wavelengths by specifying the squareness ratio in the perpendicular direction or intra-surface direction of a magnetic recording layer formed by coating this layer with hexagonal ferrite powder together with a binder component. CONSTITUTION:The magnetic recording layer formed by coating this layer with the hexagonal ferrite powder together with the binder component is provided on a nonmagnetic base body and the squareness ratio in the perpendicular direction or intra-surface direction of this magnetic recording layer is specified to >=0.60. This may be formed into a two-layered structure as well by applying the accicular magnetic powder, such as gamma-Fe2O3, Co-deposited gamma-Fe2O3 or CrO2, together with the binder component (as a substrate) on the inner side of the hexagonal ferrite powder having >=0.60 squareness ratio in the perpendicular direction or intra-surface direction to provide the magnetic layer oriented in the intra-surface direction. The output characteristics of the short wavelengths are improved in this way.

8. 发明专利

JPS6488921A MAGNETIC TRANSFERRING DEVICE 失效
公开(公告)号：JPS6488921A
公开(公告)日：1989-04-03
申请号：JP24549287
申请日：1987-09-29
申请人： TOSHIBA CORP
发明人： EGUCHI YOSHINORI , ISSHIKI MASANORI
IPC分类号： G11B5/86
摘要： PURPOSE:To improve the adhesion between master and slave media by superimposing the magnetic surface of the master and slave media opposite, regulating the outer circumference with the outer circumferential regulating member and escaping the air between both media from an air vent hole provided at a regulating member. CONSTITUTION:A floppy disk, which becomes a slave medium 3, is placed onto the same diameter disk-shaped master medium 2 and the same master medium 1 is mounted onto it. The media 1-3 are press-bonded and fixed to an outer circumferential regulating member 4 by press-bonding rings 11 and 12. The residual air between master media 1 and 2 and a slave medium 3 is escaped from an air vent hole 8 provided on an inner side wall 6a of the member 4 to a hollow part 7 to the inside of a ring part 6 and discharged from an outer side wall part 9 through an air suction duct 10 to the external part. Next, by adding a bias magnetic field for transfer to the media 1-3 with bias magnetic field generating coils 13 and 14, the information recorded at the media 1 and 2 is transferred to both surfaces of a disk 2.

9. 发明专利

JPS63177317A MAGNETIC TRANSFER METHOD 失效
公开(公告)号：JPS63177317A
公开(公告)日：1988-07-21
申请号：JP949087
申请日：1987-01-19
申请人： TOSHIBA CORP
发明人： SUZUKI TOSHIYUKI , ISSHIKI MASANORI
IPC分类号： G11B5/86
摘要： PURPOSE:To obtain a high-quality copy by using a tape, the temp. coefft. of the coercive force of which is larger than the temp. coefft. of the coercive force of a master magnetic recording medium for a slave magnetic recording medium thereby lowering the temp. relatively. CONSTITUTION:A vapor deposited tape or metal tape is used for the master 2 and a hexagonal ferrite tape consisting of Ba ferrite or the like is used for the slave 1. The tape is passed between a magnetic transfer head 3 cooled at -20 deg.C and a roller 4. The coercive force of the master increases and the coercive force of the slave decreases at the temp. lower than ordinary temp. in the case of this combination. The transfer AC magnetic field generated from the magnetic circuit in the head 3 acts on the slave tape 2 and the magnetic transfer of signals is executed from the master 1 to the slave 2 with high efficiency. The slave tape 2 restores the coercive force to maintain the good high- density characteristic at the time of using the same for regeneration.

10. 发明专利

JPS63166023A MAGNETIC TRANSFER DEVICE 失效
公开(公告)号：JPS63166023A
公开(公告)日：1988-07-09
申请号：JP30962586
申请日：1986-12-27
申请人： TOSHIBA CORP
发明人： KURATA YASUTAKE , ISSHIKI MASANORI
IPC分类号： G11B5/86
摘要： PURPOSE:To stabilize a bit of magnetic information on a master medium and to perform magnetic transfer at high speed and in large quantities, by using a medium having temperature dependability whose coercive force is positive as the master medium, and heating an adhesive part between the master medium and a slave medium on which an AC transfer magnetic field is impressed at a temperature higher than a room temperature. CONSTITUTION:A Co-Ti replace type Ba ferrite coating tape is used as the master medium, and a Co coated gamma-Fe2O3 tape is used as the slave medium. The coercive force of the Co-Ti replace type Ba ferrite coating tape shows positive temperature dependability, and meanwhile, the coercive force of the Co coated gamma-Fe2O3 tape shows a negative temperature dependability. Therefore, when the temperature of those tapes are raised, he coercive force of the Co-Ti replace type Ba ferrite coating tape is increased, and adversely, that of the Co coated gamma-Fe2O3 tape is decreased, then, a difference between both coercive forces is increased. In such a way, the bit of magnetic information written on a master tape 17 is stabilized magnetically, and by performing the magnetic transfer setting the master tape as an endless tape, it is possible to form a large number sheets of copy continuously at high speed.

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