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31. 发明专利

JPH0416210A AIR FILTER UNIT 失效
公开(公告)号：JPH0416210A
公开(公告)日：1992-01-21
申请号：JP11525190
申请日：1990-05-02
申请人： FUJITSU LTD
发明人： MAETA HIROSHI
IPC分类号： B01D46/10
摘要： PURPOSE:To simplify the assembly work and improve the efficiency of dust removal by pinching and fixing an attachment part of a filtering material of an air filter between plates in both sides having a circular soft material between them. CONSTITUTION:An attachment part of a sheet like air filter material 11 to remove dust floating in air is pinched and fixed between plates 10, 13 in both sides, while a circular soft material 12 is put between them. As a result, the part is fixed airtightly and, at the same time, since no adhesive is needed, the assembly work becomes simple. Also, the decrease of the effective surface area owing to bleeding an adhesive is prevented, so that dust removing effi ciency is improved.

32. 发明专利

JPH01307064A MAGNETIC HEAD POSITIONING CONTROL SYSTEM 失效
公开(公告)号：JPH01307064A
公开(公告)日：1989-12-12
申请号：JP13791788
申请日：1988-06-03
申请人： FUJITSU LTD
发明人： YAMADA TOMOYOSHI , MIZOSHITA YOSHIBUMI , ARIGA TAKAHARU , MAETA HIROSHI , SUZUKI NORIHIKO
IPC分类号： G11B21/02 , G05D19/02
摘要： PURPOSE:To cancel the oscillation mode of a flat type moving part and to increase the head positioning accuracy by conducting respective different driving currents to two flat type twisting coils and generating a moment. CONSTITUTION:In the cavity magnetic field in a magnetic circuit composed of permanent magnets 43a-43d and a yoke, a flat type carriage 44 to support a magnetic head slider by ahead arm 46 and a moving part 45 to provide flat type twisting coils L1 and L2 symmetrically to both front and rear surfaces of the gravity center position are arranged. When the magnetic head positioning is executed by the linear movement of the moving part 45, by conducting the respective different driving currents to both coils L1 and L2, the moment is generated and the oscillation to occur at the moving part 45 is suppressed.

33. 发明专利

JPS63213176A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS63213176A
公开(公告)日：1988-09-06
申请号：JP4585487
申请日：1987-02-27
申请人： FUJITSU LTD
发明人： MIZOSHITA YOSHIBUMI , ARIGA TAKAHARU , IMAMURA TAKAHIRO , MAETA HIROSHI
IPC分类号： G11B21/10
摘要： PURPOSE:To compensate the error of head position due to abnormal vibration, by providing a sensor which detects the abnormal vibration such as to accelerate head access on a part of a housing, and processing a detecting signal, then inputting it to a driving amplifier. CONSTITUTION:An acceleration sensor 21 which detects the generation of the abnormal vibration in a direction of access is provided on a part of the housing which houses a magnetic disk 1 and a magnetic head 5, etc. When vibration due to earthquake or from the outside is received while the magnetic disk device is operated, the acceleration sensor 21 detects it, and a detected signal is changed to a servo compensating signal at a gain setting apparatus 22, and is supplied to an adder 23. At the adder 23, an ordinary head aberration compensating signal from a servo compensation circuit 11 in a head positioning control system and the signal from the gain setting apparatus 22 are added, and a driving motor 8 is driven by an added signal via a driving amplifier 12. Thus, the error of the head positioning due to external vibration can be compensated.

34. 发明专利

JPS63868A HEAD POSITIONING MECHANISM 失效
公开(公告)号：JPS63868A
公开(公告)日：1988-01-05
申请号：JP14457386
申请日：1986-06-19
申请人： FUJITSU LTD
发明人： MAETA HIROSHI , MIZOSHITA YOSHIBUMI , ARIGA TAKAHARU , YAMADA TOMOYOSHI
IPC分类号： G11B21/02 , F16C29/00 , F16C29/02 , G11B33/14
摘要： PURPOSE:To prolong the long service life of a carriage guide mechanism, and to obtain a magnetic disk device with high reliability, by fitting a ring of ceramics at the outside of the outer ring of a ball bearing which guides the linear movement of a carriage. CONSTITUTION:A ring 22 made of an aluminium is fitted to the outside of the outer ring 211 of a ball bearing 21 which guides a carriage 13. In such way, though the aluminium ring 22 is brought into contact with the slanting guide part of the carriage 13, since the ring 22 has a superior wear resistant characteristics, the abrasion is reduced by the fast movement of the carriage 13, so only the quantity of abrasion particles is reduced, and it is possible to prolong the long service life of the carriage guide mechanism.

35. 发明专利

JPH09320050A METHOD FOR MANUFACTURING RECORDING MEDIUM, AND MANUFACTURING APPARATUS THEREFOR, AND MEMORY DEVICE USING THE MANUFACTURED RECORDING MEDIUM 失效
公开(公告)号：JPH09320050A
公开(公告)日：1997-12-12
申请号：JP13186896
申请日：1996-05-27
申请人： FUJITSU LTD
发明人： MAETA HIROSHI , OTSUKA YOSHINORI , KOSHIKAWA YOSHIO
IPC分类号： B24B37/013 , B24B37/07 , G11B5/84 , B24B37/04
摘要： PROBLEM TO BE SOLVED: To reduce the fabrication fluctuation of a recording medium or improve the flatness of recording medium surface, by detecting amount of fabrication for flatness of a film formed on a substrate depending on the change of electrical characteristic and then controlling the fabrication for flatness in accordance with a detected value. SOLUTION: At the time of manufacturing a recording medium, a resistance is detected depending on thickness of a metal film 32a with electrodes 38a, 38b placed in contact with a substrate 32 in a process to execute the fabrication for flatness by the polishing of the meal film 32a formed on the substrate 32. When this resistance value reaches a value not influenced by the metal film 32a, the polishing is stopped under the condition of (c). Thereby, fabrication fluctuation can be reduced by controlling the amount of fabrication for every substrate and flatness of the medium surface can be improved.

36. 发明专利

JPH09320027A MANUFACTURE OF MAGNETIC HEAD SLIDER 失效
公开(公告)号：JPH09320027A
公开(公告)日：1997-12-12
申请号：JP13163696
申请日：1996-05-27
申请人： FUJITSU LTD
发明人： KATAYAMA MAKI , KOSHIKAWA YOSHIO , IMAMURA TAKAHIRO , MAETA HIROSHI
IPC分类号： G11B5/60 , G11B21/21
摘要： PROBLEM TO BE SOLVED: To obtain a method for manufacturing a magnetic head slider with improved lubrication property where a floating surface that is opposed to a magnetic medium is formed nearly in parallel with a head element layer without depending on machining and easily. SOLUTION: In the method for manufacturing a magmetic head slider for separating a magnetic head slider 20 from a substrate 30 by forming a sacrifice layer 31 on the substrate 30, then forming a head element layer 23 and a floating surface layer 24, and further forming a slider body part 29 by plating, and hence constituting the magnetic head slider 20 on the substrate, and then eliminating the sacrifice layer 31, a protection film layer 21 and a first adhesive layer 22 for adhering the protection film layer 21 and the head element layer 23 are formed after forming the sacrifice layer 31 and before forming the head element layer 23.

37. 发明专利

JPH0973746A HEAD SUPPORTING MECHANISM OF DISK DEVICE 失效
公开(公告)号：JPH0973746A
公开(公告)日：1997-03-18
申请号：JP22483895
申请日：1995-09-01
申请人： FUJITSU LTD
发明人： MAETA HIROSHI
IPC分类号： G11B21/21 , G11B21/02 , G11B21/10
摘要： PROBLEM TO BE SOLVED: To make the microdisplacement of tracking correction possible by applying voltage signals to first to fourth electrode elements so as to elongate and contract first to fourth piezoelectric elements in the in-phase or anti-phases. SOLUTION: The voltage signals are applied on the respective piezoelectric elements in such a manner that the piezoelectric elements 36, 40 elongate and contract in the in-phase, the piezoelectric elements 38, 42 elongate and contract in the in-phase as well and the elements 36, 38 elongate and contract in the anti-phases at the time of microdisplacing a head 22 in the diametral direction of a magnetic disk during tracking correction. For example, a load beam 18 is deflected and the head 22 is microdisplaced in the diametral direction of a solid line arrow 78 when the elements 36, 40 are elongated and the elements 38, 42 are contracted by such voltage signals. On the other hand, the head 22 is microdisplaced in the diametral direction of a broken arrow 80 when the voltage signals are so applied that the element 36, 40 contract and the elements 38, 42 elongate. At this time, the reproducibility of the elongation and contraction rates per the unit impressed voltage of the respective elements is good and, therefore, the microdisplacement of the head 22 with the high accuracy is made possible. The microdisplacement of the head 22 in the vertical direction of a solid line arrow 82 is similarly made possible and the accident of the head is prevented.

38. 发明专利

JP2518895B2 失效
公开(公告)号：JP2518895B2
公开(公告)日：1996-07-31
申请号：JP20309088
申请日：1988-08-17
申请人： FUJITSU LTD
发明人： ARIGA TAKAHARU , SUZUKI NORIHIKO , YAMADA TOMOYOSHI , MAETA HIROSHI , IMAMURA TAKAHIRO
IPC分类号： G11B21/02 , H02K33/18

39. 发明专利

JPH07262524A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH07262524A
公开(公告)日：1995-10-13
申请号：JP4870994
申请日：1994-03-18
申请人： FUJITSU LTD
发明人： KOSHIKAWA YOSHIO , MAETA HIROSHI , IMAMURA TAKAHIRO , KATAYAMA MAKI
IPC分类号： G11B5/35 , B81B3/00
摘要： PURPOSE:To provide the highly reliable magnetic recording and reproducing device by stepwisely turning a magnetic storage medium with a driving means and allowing it to act with its turning center maintained. CONSTITUTION:The magnetic storage medium 6 is mounted to be turnable around the turning center RA on a substrate 4 consisting of insulating materials of silicon and ceramics, etc. An X-axial line 8 passing through the turning center RA and a Y-axial line 10 orthogonal to this X-axial line are provided, and the base part side of a head supporting arm 12 is fixed to the substrate 4 by a fixing part 14. The head supporting arm 12 is extended parallel to the Y-axial line 10, and its tip is positioned on the X-axial line 8. The tip of the head supporting arm 12 is fitted with a magnetic head 16 for recording and reproducing data on the magnetic storage medium 6, and this head is brought into slide contact with the magnetic storage medium 6 by an extremely low load. Consequently, the magnetic recording and reproducing device suitable for miniaturization with light weight and feasible of large capacity and moreover with high reliability can be obtained.

40. 发明专利

JPH06267236A MAGNETIC MEMORY DEVICE 失效
公开(公告)号：JPH06267236A
公开(公告)日：1994-09-22
申请号：JP4907393
申请日：1993-03-10
申请人： FUJITSU LTD
发明人： MAETA HIROSHI , TAKAHASHI MINORU
IPC分类号： G11B19/20 , G11B25/04
摘要： PURPOSE:To rotationaly move a magnetic memory disk by microsteps while utilizing the electrostatic force generated by fewer electrodes with the magnetic memory MR head which can make high-density recording with a microminiature size, thereby forming the recording tracks of a diametral direction at a high density in its circumferential direction. CONSTITUTION:A means for turning the magnetic memory disk 12 supported to a stationary shaft 11a on a sheet-like substrate 11 is constituted by fixing plural comb-shaped A electrodes 22, radially from this stationary shaft 11a, via an insulating film 21 on this sheet-like substrate 11 facing the rear surface of the magnetic memory disk 12 and supporting flexible plural comb-shaped B electrodes 23, in the state of isolating these electrodes from the stationary shaft 11 a, so as to mesh these electrodes with the respective plural comb-shaped A electrodes 22 without contact. The magnetic memory disk 12 is turned stepwise by the microsteps of repeating the operations to electrostatically attracting the B electrodes 23 electrostatically attracted, by deflection of the front ends, to the, rear surface of the magnetic memory disk 12 further toward the A electrode 22 side, then parting the front ends from the rear surface of the magnetic memory disk 12 and returning the B electrodes 23 to their home positions.

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