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51. 发明专利

JPH05143949A MAGNETIC HEAD 失效
公开(公告)号：JPH05143949A
公开(公告)日：1993-06-11
申请号：JP30446991
申请日：1991-11-20
申请人： HITACHI LTD
发明人： SUZUKI TOMIO , TAKAHASHI TAKESHI , NISHIMURA YUJI , HATANAKA NORIAKI
IPC分类号： G11B5/60 , G11B21/02 , G11B25/04
摘要： PURPOSE:To make the device large in capacity and thin in thickness narrowing the space of a magnetic disk while arranging a head IC and wiring parts on the guide arm side. CONSTITUTION:An FPC 8 with the head IC mounted is attached to the side of a guide arm 6 supporting a slider 4 and a supporting spring 5, and the wiring parts are housed in the guide arm width. An electronic element for amplification is arranged near the head to provide the magnetic head hard to be affected by noise. As the arrangement of the electronic circuit parts is not required on the guide arm surface opposed to the disk surface, enabling narrow pitch.

52. 发明专利

JPH0536261A COOLING STRUCTURE FOR MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH0536261A
公开(公告)日：1993-02-12
申请号：JP18977391
申请日：1991-07-30
申请人： HITACHI LTD
发明人： KIMURA HIDEYUKI , TAKAHASHI TAKESHI , EBIHARA SUSUMU , NISHIMURA YUJI
IPC分类号： G11B33/14
摘要： PURPOSE:To suppress a temp. rise of a magnetic disk drive to a min. by making a cooling airflow run into the magnetic disk device from another fan even when one fan is stopped because of trouble. CONSTITUTION:A pitch of disposition of fans 15 is shifted from a pitch of magnetic disk devices 1 by half a pitch, and one magnetic disk device 1 is cooled by more than one fan 15.

53. 发明专利

JPH04283480A MAGNETIC DISK, POSITIONING SIGNAL WRITING/READING HEAD, AND METHOD AND DEVICE FOR MAGNETIC HEAD POSITIONING SIGNAL WRITING 失效
公开(公告)号：JPH04283480A
公开(公告)日：1992-10-08
申请号：JP4671591
申请日：1991-03-12
申请人： HITACHI LTD
发明人： SHIMIZU TAKEMASA , NARUSE ATSUSHI , TAKAHASHI TAKESHI , NISHIMURA YUJI
IPC分类号： G11B21/10 , G11B5/55
摘要： PURPOSE:To eliminate the error by measuring the error of the positioning signal being read and rewriting the positioning signal in the magnetic disk so as to compensate the positioning error. CONSTITUTION:A piezoelectric element 4c is provided on a head arm 4d of a positioning signal R/W head and the tip part 4b of the head arm moves a minute distance in the arrow B direction with a drive of the element 4c. Also a head slider 4e writes or reads out the positioning signal. Here the written positioning signal is read out with a fixed clock head and the positioning error included therein is measured. Based on the position signal from a position signal demodulation part, the vibration component synchronized with the rotation of the magnetic disk 2 is detected and the correction amount to correct the position is set and is stored in a storage part. Based on the error measured, a CPU controls the control part and the head moves so as to compensate the measured positioning error. Hence the error synchronizing with the rotation of the disk 2 is eliminated.

54. 发明专利

JPH04205863A MAGNETIC DISK APPARATUS 失效
公开(公告)号：JPH04205863A
公开(公告)日：1992-07-28
申请号：JP32935390
申请日：1990-11-30
申请人： HITACHI LTD
发明人： TATE YOSHIYUKI , MORI KENJI , TOYAMA SOICHI , OTSUKI HARUAKI , HAMADA YOSUKE , NISHIMURA YUJI , SAITO SHIGEYOSHI
IPC分类号： G11B21/10
摘要： PURPOSE:To accurately correct a thermal off-track caused by the passage of time by a method wherein positioning information other than a servo signal recorded from a recorded signal is detected and a head-position correction mechanism which positions each data head is installed in the center of each data track. CONSTITUTION:Second positional information is found from data signals which have been recorded on all data tracks; it is recorded. A head-position correction mechanism which positions individual data heads 103 in the central position of the individual data tracks on the basis of the positional information is installed. Consequently, the data tracks are positioned simultaneously by the positional information which is read out by using a servo head 104; the dislocation from the center of the tracks of the individual data heads 103 can be corrected. Thereby, the influence of a thermal off-track caused by the passage of time is eliminated, and a high positioning accuracy can be maintained.

55. 发明专利

JPH01319198A ROTARY DISK TYPE STORAGE DEVICE 失效
公开(公告)号：JPH01319198A
公开(公告)日：1989-12-25
申请号：JP15204088
申请日：1988-06-20
申请人： HITACHI LTD
发明人： SHIBUYA TAKESHI , KIMURA HIDEYUKI , NISHIMURA YUJI , TAKAHASHI TAKESHI , NARUSE ATSUSHI , TOKUYAMA MIKIO , YAMAGUCHI YUZO
IPC分类号： G11B33/14
摘要： PURPOSE:To sufficiently cool by correctly conducting an airflow to accompany the rotation of a rotary disk such as a magnetic disk to an exothermic part which requires cooling. CONSTITUTION:An opening 31 to contain the crossing point of a tangent from the existing range of an IC 34 for processing the signal of a transducer on a supporting means 5 and a barrier 16 is provided. When the second opening 31 is provided, the airflow generated in accompanying the high-speed rotation of a magnetic disk 2 is not directed in a (c) direction but made into a strong airflow (a) directed at an optimum angle to the read/write IC 34 in the part of a (b). The strong airflow (a) is made to compulsorily cool the read/write IC 34 as a heating element on a transducer driving mechanism and, simultaneous ly, to sufficiently cool a voice coil 10 of a driving means 12.

56. 发明专利

JPS6450293A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS6450293A
公开(公告)日：1989-02-27
申请号：JP20523787
申请日：1987-08-20
申请人： HITACHI LTD
发明人： SUZUKI MASAMI , NISHIMURA YUJI , UNE TOKUKI , NAKANISHI MICHIHIRO , NISHIDA HIROSHI
IPC分类号： G11B21/21 , G11B33/14
摘要： PURPOSE:To prevent data from being destructed due to the sliding of a magnetic head with a magnetic disk, by providing a means to detect the temperature of the magnetic head or the magnetic disk, or both temperature of them. CONSTITUTION:The means to detect the temperature of the magnetic head or the magnetic disk, or both of them is provided. For example, since the temperature of a contact part is raised to around 400k due to frictional heating when a servo head core slider 1s slides with the magnetic disk 2, a deviation quantity (delta) at that time shows around 15mum, which can be detected by a transducer part 52' satisfactorily. When such status is generated, by displaying an alarm or stopping a device automatically by interlocking with an output signal from the transducer part 52', it is possible to prevent magnetic recording information from being destructed.

57. 发明专利

JPS63259885A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS63259885A
公开(公告)日：1988-10-26
申请号：JP9304487
申请日：1987-04-17
申请人： HITACHI LTD , HITACHI COMPUTER PERIPHERALS
发明人： MIHASHI HIROYUKI , SUZUKI MASAMI , SUZUKI TOMIO , NISHIDA HIROSHI , TAKAHASHI TAKESHI , NAKAKOSHI KAZUO , NARUSE ATSUSHI , NISHIMURA YUJI , NAKANISHI MICHIHIRO
IPC分类号： G11B25/04 , G11B21/02 , G11B33/08 , G11B33/12
摘要： PURPOSE:To attenuate the vibrations produced by the positioning drive and to extremely improve the positioning accuracy for a magnetic disk device, by providing an additional mass member which can move toward the functioning direction of the positioning drive force for a magnetic head and a means which presses said mass member. CONSTITUTION:A movable coil 5 set at the back of an actuator 4 which supports a magnetic head 3 is put into a magnetic circuit 6. Thus the coil 5 is energized with conduction to produce the electromagnetic drive force and performs the positioning operation of the actuator 4. The circuit 6 receives the reaction (f) with the positioning drive applied in the direction D and a movable mass 7 is moved up to a position (x) by the warp of a spring 8 and the function of a dashpot 11 to be balanced with the reaction. As a result, the circuit 6 has no displacement and no vibration is transmitted to a spindle 1 nor a disk 2. Thus the head 3 is positioned with high accuracy.

58. 发明专利

JPH09166145A DYNAMIC PRESSURE BEARING DEVICE AND SPINDLE MOTOR USING IT 失效
公开(公告)号：JPH09166145A
公开(公告)日：1997-06-24
申请号：JP32447295
申请日：1995-12-13
申请人： HITACHI LTD , JAPAN SERVO
发明人： TOMITA KENJI , KONO TAKASHI , NAKANO MASAAKI , INOUE TOMOAKI , NISHIDA HIROSHI , NISHIMURA YUJI , SATO KEN , HATORI SACHIO
IPC分类号： F16C17/10 , F16C17/02 , F16C17/04 , F16C32/04 , F16C33/66 , F16C33/74
摘要： PROBLEM TO BE SOLVED: To provide a dynamic pressure bearing device to reliably prevent leakage of a lubricant. SOLUTION: A bearing device is formed in such a manner that a rotary shaft 1 is fitted in the hole of a bearing 2 fixed on the inner periphery of a housing 3 provided at a front end with an opening and at a rear end with a cover, a groove pattern for generating a dynamic pressure is formed on the hole surface of a bearing 2/the outer peripheral surface of the rotary shaft 1 to form a radial bearing, a thrust disc 4 having diameter larger than that of the shaft is arranged at the rear end of the rotary shaft 1, groove patterns for generating a dynamic pressure are formed on the front and rear surfaces of the thrust disc 4 to form a thrust bearing, and each bearing part is sealed with magnetic fluid 12 of a lubricant. A magnetic fluid seal 8 consisting of an axially magnetized annular permanent magnet 9 and first and second magnetic poles 10 and 11 are arranged on the front end face of the bearing 2. The rotary shaft 1 is sealed by magnetic fluid seal, and further a recessed groove 13 is formed in the outer peripheral surface of the rotary shaft l positioned facing the permanent magnet 9 to deviate a magnetic field, magnetic fluid is held at a second magnetic pole, and movement to a first magnetic pole is suppressed.

59. 发明专利

JPH09115257A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH09115257A
公开(公告)日：1997-05-02
申请号：JP26680995
申请日：1995-10-16
申请人： HITACHI LTD
发明人： MIYAMOTO YUSUKE , NISHIMURA YUJI , NISHIDA HIROSHI
IPC分类号： G11B21/22 , G11B21/02 , G11B21/12
摘要： PROBLEM TO BE SOLVED: To make a magnetic head move to the inner periphery stop there at the time of stopping the rotation of the magnetic head by arranging a magnetic body near a permanent magnet for revising and correcting external force of a coil carriage by operating a magnetic circuit. SOLUTION: The magnetic head is attached to the coil carriage consisting of a carriage 1 and a coil 2. Further, a lower yoke 3-b, the coil 2, the permanent magnet 4 and an upper yoke 3-a are in a line in this order from the bottom so as to hold the coil 2 therebetween for forming the magnetic circuit. Further, a latch pin 6 for moving the coil carriage and fixing the magnetic head 7 to the inner periphery is attached backward the coil 2, and a latch magnet 5 is attached backward the magnet 4. The pin 6 is affected by the leakage magnetic flux of the magnet 4 through the magnetic body 11 according to approach the magnet 5. Thus, the pin 6 is attracted to the magnet 5 when magnetic disk rotation is stopped, and the magnetic head moves to the inner periphery to stop.

60. 发明专利

JPH05250827A 失效
公开(公告)号：JPH05250827A
公开(公告)日：1993-09-28
申请号：JP5064392
申请日：1992-03-09
申请人： HITACHI LTD
发明人： YOSHIDA SHINOBU , MORI KENJI , NISHIMURA YUJI
IPC分类号： G11B21/02 , G11B21/16 , G11B25/04
摘要： PURPOSE:To enhance positioning accuracy of access and also to suppress displacement in the vertical direction by guiding and supporting a carriage with at least three supporting members, each one end being fixed, having their movements in their specific directions respectively. CONSTITUTION:The three supporting members 31 formed with reciprocating leaf springs are arranged to be deviated from one another in the access direction, and each one end is fastened via an engagement metal fitting 25 to a fixing member 22, while the other end to a carriage barrel 16. Then, when the carriage 14 is driven in the access direction of P by making a current flow in an actuator movable coil 17, degree of freedom in the directions of translation and rotation is restrained by the individual supporting members 31a in a plane that is vertical to the direction of P, and pitching and yawing of the carriage are also restrained. Consequently, the individual supporting members 31a are bent in the access direction, and hence the carriage 14 is restrained in degree of freedom in five directions except the access direction by the three supporting members 31a, and is guided in translation. By this method, the displacement in the vertical direction is suppressed, and hence smooth movement can be carried out.

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