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1. 发明专利

GB2303486B Magnetic disc drive 未知
公开(公告)号：GB2303486B
公开(公告)日：1999-05-05
申请号：GB9604990
申请日：1996-03-08
申请人： MITSUBISHI ELECTRIC CORP
发明人： SUGAWARA NAOTO , WATANABE SEIICHI , HANDA SEIICHI
IPC分类号： G11B5/60 , G11B5/10 , G11B5/105 , G11B5/127 , G11B5/187 , G11B5/23 , G11B5/265 , G11B5/48 , G11B5/58
摘要： A magnetic head device is disclosed, including a magnetic circuit having a head core unit, a back core and a coil. The head core unit includes a first core made from a magnetic material and a second core made from a magnetic material. A magnetic gap is formed between the first core and the second core. The back core is made from a magnetic material and is joined to the first core and the second core to form back gaps between the back core and vertical portions of the first and second cores, and the coil is mounted on the first core. The device includes a first holder which is bonded to the first and second cores at two locations, one on the side of the magnetic gap and one on the side of the back gaps, to hold the magnetic circuit. The device further includes a second holder which is bonded to the first and second cores at the magnetic gap side to hold the magnetic circuit, the second holder being substantially in the shape of a rectangular beam.

2. 发明专利

GB2303486A Magnetic disc drive head structure 未知
公开(公告)号：GB2303486A
公开(公告)日：1997-02-19
申请号：GB9604990
申请日：1996-03-08
申请人： MITSUBISHI ELECTRIC CORP
发明人： SUGAWARA NAOTO , WATANABE SEIICHI , HANDA SEIICHI
IPC分类号： G11B5/60 , G11B5/10 , G11B5/105 , G11B5/127 , G11B5/187 , G11B5/23 , G11B5/265 , G11B5/48 , G11B5/58
摘要： A magnetic head device is disclosed, including a magnetic circuit having a head core unit, a back core and a coil. The head core unit includes a first core made from a magnetic material and a second core made from a magnetic material. A magnetic gap is formed between the first core and the second core. The back core is made from a magnetic material and is joined to the first core and the second core to form back gaps between the back core and vertical portions of the first and second cores, and the coil is mounted on the first core. The device includes a first holder which is bonded to the first and second cores at two locations, one on the side of the magnetic gap and one on the side of the back gaps, to hold the magnetic circuit. The device further includes a second holder which is bonded to the first and second cores at the magnetic gap side to hold the magnetic circuit, the second holder being substantially in the shape of a rectangular beam.

3. 发明专利

JPH09265606A MANUFACTURE OF MAGNETIC HEAD 失效
公开(公告)号：JPH09265606A
公开(公告)日：1997-10-07
申请号：JP7648996
申请日：1996-03-29
申请人： MITSUBISHI ELECTRIC CORP
发明人： HANDA SEIICHI , OUCHI HIROBUMI , ISHII HIROMASA , MUNAKATA KENICHI , WATANABE SEIICHI
IPC分类号： G11B5/265 , G11B5/127 , G11B5/187
摘要： PROBLEM TO BE SOLVED: To prevent the performance of the magnetic head from deteriorating, thereby eliminating the formation of a back gap due to grinding liquid and refuse, etc., stuck to a back bar of a magnetic core by performing assembling of a slider prior to grinding and to improve the stability and production yield in reducing damage of the magnetic core by fixing upper and lower parts of the core with holders. SOLUTION: An assembly 12 of setting coils 2a and 2b on the magnetic core 1 is set in the holder 3 having a U-shaped cross section, and is then set in the holder 4 and the back bar 5, and then an adhesive is applied on them, and is cured. Subsequently, a grinding margin 13 of the back bar 5 is ground to be removed, and a radius surface grinding part 14 is also ground. Consequently, grinding waste, etc., are prevented from sticking to a back bar fitting surface of the magnetic core, thus eliminating a gap to be formed between the magnetic core and the back bar, and hence the performance of the magnetic head is prevented from deteriorating, and also damage of the magnetic core by the holder is reduced, and then production yield is improved.

4. 发明专利

JPH07192219A MAGNETIC HEAD 失效
公开(公告)号：JPH07192219A
公开(公告)日：1995-07-28
申请号：JP33538593
申请日：1993-12-28
申请人： MITSUBISHI ELECTRIC CORP
发明人： MURATA YUICHIRO , TERASAWA TAKESHI , EGUCHI SHINICHIRO , HANDA SEIICHI
IPC分类号： G11B5/265 , G11B5/127 , G11B5/245
摘要： PURPOSE:To decrease the crosstalk without lowering the efficiency of an erasing head by nearly equalizing the product of the magnetic resistance of a center core and the magnetic resistance of a route arriving directly at a recording and reproducing core through the outside of a head from the signal of a medium on an erasing gap and the product of the magnetic resistance of a part where the erasing core and the erasing back core are jointed and the magnetic resistance of a recording and reproducing gap part. CONSTITUTION:PHI4 is a magnetic flux returning to Vm by passing the recording and reproducing gap part Rg, the recording and reproducing core part Rr and the erasing core part Re from the signal Vm of the medium on the erasing gap and the caption number 6 is a magnetic flux returning to Vm by passing the center core Rc, the recording and reproducing part Rr and the outside part Ro of the head from the signal Vm of the medium. The magnetic flux PHI flowing in the recording and reproducing core part Rr is a synthesized one of PHI4 and PHI6 and corresponds to the crosstalk which is given by equation I. The polarity of the crosstalk inverts from positive to negative and the efficiency of the erasing head lowers if the magnetic resistance Re of the erasing back core part is increased. The zero crosstalks are realized near the magnetic resistance Re by satisfying equation II.

5. 发明专利

JPH05189718A MAGNETIC HEAD 失效
公开(公告)号：JPH05189718A
公开(公告)日：1993-07-30
申请号：JP2424692
申请日：1992-01-16
申请人： MITSUBISHI ELECTRIC CORP
发明人： HANDA SEIICHI , OUCHI HIROBUMI , SANPEI TOSHIMASA
IPC分类号： G11B5/265
摘要： PURPOSE:To obtain the magnetic head capable of suppressing cross talk without providing a dedicated circuit for suppressing cross talk due to an erase gap at the time of read. CONSTITUTION:A magnetic flux change due to recording information of a recording medium is received by a read/write gap 2, and hence an output voltage V0 is generated between both taps 10a and 10b of a read/write coil 10 and is detected by a read/write circuit 13, so that the recording information of the recording medium is read out. On the other hand, magnetic flux by the recording information of the recording medium is generated by the erase gap 3, whereas a current is conducted in a short-circuit coil part of a erase coil 11 by this magnetic flux, and magnetic flux is generated to cancel a magnetic flux change due to the erase gap 3. As a result, magnetic flux in the erase core 7 is decreased, and a cross talk output voltage generated on the read/write coil 10 is very small, so that the readout can be carried out with good accuracy.

6. 发明专利

JPH02260208A DEVICE FOR FIXING BACK BAR OF MAGNETIC HEAD 失效
公开(公告)号：JPH02260208A
公开(公告)日：1990-10-23
申请号：JP8057689
申请日：1989-03-31
申请人： MITSUBISHI ELECTRIC CORP
发明人： HANDA SEIICHI
IPC分类号： G11B5/60 , G11B5/127
摘要： PURPOSE:To simply fix a back bar without using an exclusive member by forming respective inclined faces on the opposite faces of the back bar and a slider or a bobbin and pressing the back bar by a spring chip formed on a gimbal spring. CONSTITUTION:The back bar 6 is arranged so that its inclined face 6a comes into contact with the inclined face 2Bb of the slider 2B and its opposite face comes into contact with the side of the head of the leg part of a magnetic core 3. When the gimbal spring 1 is stuck to the adhering faces 2Aa, 2Bb of the sliders 2A, 2B, the spring chip 1a presses the back bar 6 in the direction along the face of the core 3. Since the inclined faces 6a, 2Bb act as wedges, pressing force based upon the spring chip 1a is divided and the back bar 6 is pressed by the face of the core 3 and stuck fast to the core 3. Consequently, the back bar 6 can be simply fixed on the magnetic core 3 without using an exclusive spring or holder.

7. 发明专利

JPH10255221A COMPOSITE TYPE MAGNETIC HEAD AND MANUFACTURE OF HEAD CORE OF THE SAME 失效
公开(公告)号：JPH10255221A
公开(公告)日：1998-09-25
申请号：JP6041197
申请日：1997-03-14
申请人： MITSUBISHI ELECTRIC CORP
发明人： OUCHI HIROBUMI , OBUSE TOSHIHISA , KASUGA YOSHIO , HIBARA TATSUNORI , TAKAHASHI MASAO , YAMADA KOICHI , HANDA SEIICHI , ISHII HIROMASA , WATANABE SEIICHI
IPC分类号： G11B5/016 , G11B5/127 , G11B5/265 , G11B5/29 , G11B5/48
摘要： PROBLEM TO BE SOLVED: To prevent generation of deviation of track surface by forming a cylindrical core member by joining a flat type core element and a recessed core element and cutting a plurality of grooves on one the joining surface orthogonal to the axis thereof to form a plurality of track surfaces. SOLUTION: A groove section 106 is cut to one joining surface to form a track surface 105 orthogonal to the axis of the cylindrical member joining a first core member 101 and a second core member 102. Here, a chromium layer is formed by the sputtering method on the surface of the groove 106 to assure good diffusion of glass material 108. A head holder member 107 is temporarily fixed with a jig and a rod type glass material 108 is placed thereon to dissolve by the heat treatment in order to join the head holder member 107 to the core member 100. A part of the glass material 108 projecting from the groove is removed by the cutting process and the joining part of the leg portion of the head core member 100 is removed also by the cutting process. Next, the cutting is made for each groove 106 in the entire part to form the head core 110 including the head holder 107a.

8. 发明专利

JPH06333209A MAGNETIC HEAD DEVICE 失效
公开(公告)号：JPH06333209A
公开(公告)日：1994-12-02
申请号：JP16724093
申请日：1993-07-07
申请人： MITSUBISHI ELECTRIC CORP
发明人： AKUTSU SATORU , SATO TADASHI , OUCHI HIROBUMI , SUGAWARA NAOTO , HANDA SEIICHI
IPC分类号： G11B5/265
摘要： PURPOSE:To provide the magnetic head device which is suppressed in generation of crosstalk noises and is not required to be particularly provided with additive circuits, etc. CONSTITUTION:Current is passed to a read-write coil 10 by a magnetic flux phir generated via a read-write gap 3 in the case of reproduction of the information recorded on a recording medium. The current is read out as the signal based on the information recorded on the recording medium. The magnetic flux phie2 generated via an erasing gap 7 is generated in the read-write core at this time. The magnetic resistance Rr of the core part exclusive of the read- write gap 3 in a read-write core chip 5 is, however, set at 1.2 times the magnetic resistance Re in the core part exclusive of the erasing gap 7 in the read-write core chip 9 and, therefore, the crosstalks are suppressed to

9. 发明专利

JPH06162407A MAGNETIC HEAD DEVICE 失效
公开(公告)号：JPH06162407A
公开(公告)日：1994-06-10
申请号：JP32896692
申请日：1992-11-16
申请人： MITSUBISHI ELECTRIC CORP
发明人： HANDA SEIICHI
IPC分类号： G11B5/02
摘要： PURPOSE:To obtain a flexible printed circuit(FPC) usable for both systems of an advance erase system and a tunnel erase system in common. CONSTITUTION:A FPC terminal part connected to a head coil terminal is wired symmetrically to a center line, and two erase coil terminals 4a and 4b which are inserted in a FPC terminal part 7b at an erase coil side electrically connected to a read write coil center terminal 3c on the FPC and a FPC terminal part 7b in adjacent to the terminal part 7b are short-circuited with a lead line 4d. Consequently, the FPC terminal part 7b at the erase coil side electrically connected to the read write coil center terminal 3c is electrically connected to a driving circuit.

10. 发明专利

JPH0552713A DUST ATTACHING APPARATUS 失效
公开(公告)号：JPH0552713A
公开(公告)日：1993-03-02
申请号：JP21862291
申请日：1991-08-29
申请人： MITSUBISHI ELECTRIC CORP
发明人： OUCHI HIROBUMI , HANDA SEIICHI
IPC分类号： B41J29/17 , B41J29/46 , G01M99/00 , G11B33/00
摘要： PURPOSE:To make it possible to attach dust to a body under test under the state close to actual use by placing the device under test into a low-pressure tightly-sealed container, and making the air containing the dust in an environment for investigation, flow into the container. CONSTITUTION:A body under test 4 is contained in a tightly closed container 1, and the container is sealed. A vacuum pump 10 is operated. Then, an air release valve 8 is opened, and the inside of the container 1 is evacuated to the specified atmospheric pressure. Thereafter, the air release valve 8 is closed, and the flow of the air in the container 1 is stopped. Then, a dust material container 3 containing a dust sample is made to approach an air nozzle 6. An air intake valve 5 is opened, and the pressure in the container 1 is returned to the atmospheric pressure. The sample 2 is injected into the container together with the sample 2. As a result, the dust is uniformly dispersed in the air even if the amount of the sample is very small. The dust is deposited to the bottom part of the inside of the container 1 approximately uniformly. When the inside of the container 1 becomes the atmospheric pressure, the valve 5 is closed. The container is left alone for about 5 minutes, and the dust is attached. After the air in the container 1 is sufficiently stabilized, the body under test 4 is taken out. Thus, the dust can be attached to the body under test with excellent reproducibility.

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