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1. 发明专利

JPH054751B2 失效
公开(公告)号：JPH054751B2
公开(公告)日：1993-01-20
申请号：JP28770785
申请日：1985-12-23
申请人： HITACHI LTD
发明人： IIDA MUNEO , PPONDA MASANOBU , KAWAMURA KATSUMI , DAITO HIROSHI , MYAKE YOSHIHIKO , SETONE SHOICHI , TAKAHASHI HATSUO , NAKANISHI MICHIHIRO
IPC分类号： G11B21/21 , G11B5/48 , G11B5/54 , G11B5/60

2. 发明专利

JPH01171172A CONTROL SYSTEM FOR MAGNETIC DISK DEVICE 失效
公开(公告)号：JPH01171172A
公开(公告)日：1989-07-06
申请号：JP32701487
申请日：1987-12-25
申请人： HITACHI LTD
发明人： KAWAMURA KATSUMI
IPC分类号： G11B21/08 , G11B21/21
摘要： PURPOSE:To prevent device destruction due to the collision of a magnetic head and a magnetic disk by controlling the driving of an actuator based on the signal of a sensor which detects an oscillation to excite the magnetic head in a floating direction. CONSTITUTION:A strain page 17 is stuck as the sensor to detect the oscillation in the floating direction, namely, in the direction of an arrow 16 on a surface in parallel to a magnetic disk 2 of a head arm 5, a detected strain is converted into a voltage signal 19 by an electric quantity converter 18, and sent to a mode control circuit 20 as a control signal. Thus, the sensor 17 to detect the oscillation in the floating direction is attached to the head arm 5, etc., and when a possibility in which the value exceeds an allowable value exists, by controlling the driving of the actuator such as deceleration of a moving speed and the delay of a next movement starting, the oscillation in the floating direction of magnetic head does not exceeds the allowable value, and the collision of magnetic heads 6 and 7 and the magnetic disk 2 can be evaded, and the file destruction can be prevented.

3. 发明专利

JPS63317993A MAGNETIC DISK 失效
公开(公告)号：JPS63317993A
公开(公告)日：1988-12-26
申请号：JP15326287
申请日：1987-06-22
申请人： HITACHI LTD
发明人： KAWAMURA KATSUMI
IPC分类号： G11B21/08
摘要： PURPOSE:To prevent head crash simply by decreasing or increasing the speed instruction when the deceleration during seek is applied to a track area having a low or high floating quantity setting value respectively. CONSTITUTION:A magnetic disk 2 is supported by a spindle 1 and a magnetic head 4 is positioned on a track of the magnetic disk 2. Then the seek of the magnetic head is applied by controlling a torque of a voice coil motor 3 in response to the speed instruction set so that the average seek time satisfies a prescribed value. In this case, in order to reduce the floating fluctuation during the seek, the speed instruction is set smaller thereby reducing the torque of the voice coil motor 3. In retarding the seek speed, the floating fluctuation at the deceleration is reduced and the minimum floating quantity is 0.2mum or over and the danger of collision with a projection is avoided.

4. 发明专利

JPS63257970A POSITIONING CONTROL METHOD FOR DATA RECORDING DEVICE 失效
公开(公告)号：JPS63257970A
公开(公告)日：1988-10-25
申请号：JP9085187
申请日：1987-04-15
申请人： HITACHI LTD
发明人： KAWAMURA KATSUMI
IPC分类号： G11B21/08
摘要： PURPOSE:To stably maintain positioning and floating precision by controlling the vibration of driving systems, which occurs and remains at the shifting time from a first position to a second position in such a way that vibration goes to a component having an opposite phase with the same frequency as the number of inherent vibration of the driving systems included in the driving force operated from a driving source at the time of shifting from the second position to a third position. CONSTITUTION:The interval of a shift action from a shift start time for the second position in the first position until a shift start time for the third position in the second position is controlled in such a way that the same frequency component as vibration of the driving systems 4 and 5, which occur when a recording and reproducing means 6 shifts from the first position to the second position and which is due to resonance, and the inherent number of vibration of the driving systems 4 and 5, which are included in the driving force operated from the driving source 3 when the recording and reproducing means 6 shifts from the second position to the third position comes to have the opposite phase. Thus, the positioning and floating precision of the recording and reproducing means 6 with respect to a recording medium 2 can stably be maintained without the harmful vibration of the driving systems 4 and 5 driving the recording and reproducing means 6 being increased while the random positioning action of the recording and reproducing means 6 is repeated.

5. 发明专利

JPS63206952A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS63206952A
公开(公告)日：1988-08-26
申请号：JP4066387
申请日：1987-02-24
申请人： HITACHI LTD
发明人： KAWAMURA KATSUMI , NISHIDA HIROSHI , SUZUKI TOMIO , SUZUKI MASAMI
IPC分类号： G11B33/12 , G11B19/04 , G11B19/20 , G11B21/02
摘要： PURPOSE:To simply prevent a fault caused by the dust by applying a lubricant which is the same kind as that used to a magnetic disk and has high affinity with the components of the magnetic disk to a mechanism part of an actuator. CONSTITUTION:An actuator holds a revolving magnetic disk 1 and a magnetic head 2 and sets the head 2 at an optional position on the disk 1. Then a lubricant of the same kind as that used to the disk 1 is applied to a mechanism part including an actuator bearing 10, a guide rail, etc. The lubricant applied to the disk 1 gives no damage to the disk even though it sticks to the disk 1 in the form of the dust. Thus the wear and the damage of a magnetic disk device can be avoided by using such a lubricant is applied to the dust generating parts.

6. 发明专利

JPS6310379A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS6310379A
公开(公告)日：1988-01-16
申请号：JP15402086
申请日：1986-07-02
申请人： HITACHI LTD
发明人： SUZUKI MASAMI , NISHIDA HIROSHI , SUZUKI TOMIO , KAWAMURA KATSUMI , TAKAHASHI TAKESHI
IPC分类号： G11B21/02 , G11B5/55 , H02K41/035
摘要： PURPOSE:To obtain an actuator for a magnetic disk device with high speed and high precision by driving the actuator and regulating the position of the center of gravity or the center position of a driving force in such a way that an oscillation which is generated then becomes minimum. CONSTITUTION:For setting a dislocation DELTAr between the center of gravity G of the actuator and the point of application P of the driving force which abnormally deteriorates the precision of positioning, the bar 21 of a ferromagnetic body is inserted to the adequate depth of a through hole 20. A magnetic flux density on the under side of a magnetic gap 18 (around the through hole 20) increases and the force around is enlarged as the bar 21 is deeply inserted, whereby the point of application P of the driving force dislocates to the under side and the dislocation DELTAr becomes small. At such a time, a magnetic head 5 reproduces and demodulates a position signal recorded in a magnetic disk 10. As to a signal waveform, the oscillation amplitude of the signal waveform becomes small as the dislocation DELTAr becomes small and becomes smallest when DELTAr=0. Consequently, the insertion depth of the bar 21 is optimum at that time.

7. 发明专利

JPS63257986A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS63257986A
公开(公告)日：1988-10-25
申请号：JP9084487
申请日：1987-04-15
申请人： HITACHI LTD
发明人： KAWAMURA KATSUMI , TAKAHASHI TAKESHI , SHIMIZU TAKEMASA , YOSHIMURA MINORU
IPC分类号： G11B33/08 , G11B25/04
摘要： PURPOSE:To improve the positioning accuracy and floating accuracy of a magnetic head, by making the node of the vibration of the natural vibration obtained when a base assembling body is used as a mass and vibration-proof rubber is used as a spring coincident with the rotating center of the magnetic head. CONSTITUTION:The position of the center of gravity of a mass and the positions, number, and spring constants of springs are set so that the node of vibration of the natural vibration, when a base assembling body composed of a base 8 and device constituting member which is fixed to and supported by the base 8 is used as a mass and vibration-proof rubber 9 is used as the springs, can be made coincident with the rotating center of a magnetic head 2. Therefore, the amplitude of the rotating center of the magnetic head 2 can be suppressed to the minimum and, as a result, the vibration of the base 8 can be reduced and the positioning accuracy and floating accuracy of the magnetic head 2 can be improved.

8. 发明专利

JPS63121463A MAGNETIC DISC APPARATUS 失效
公开(公告)号：JPS63121463A
公开(公告)日：1988-05-25
申请号：JP26393186
申请日：1986-11-07
申请人： HITACHI LTD
发明人： SUZUKI MASAMI , NISHIDA HIROSHI , SUZUKI TOMIO , KAWAMURA KATSUMI
IPC分类号： G11B21/02 , H02K33/18
摘要： PURPOSE:To compose the apparatus of high speed and high precision, by enabling the centroid position and the like of an actuator assembly unit to be variable, and by applying a regulating mass, so that oscillation may be minimum after the apparatus is assembled. CONSTITUTION:A magnetic disc apparatus using the actuator of rectilinearly driving type is composed of a carriage 1, a moving coil 2, a load arm 4, a magnetic head 5, a housing 7, guide rails 8, a bearing 9, a magnetic disc 10, a magnetic circuit 11, and the like. The moving coil 2 is inserted into the magnetic gap 18 of the magnetic circuit 11, and is energized for conduction, and the magnetic head 5 is positioned at the specified position of the magnetic disc 10. In this case, in order to diminish a positional shift r between the centroid G of an actuator assembly unit and the working point P of a driving force, a regulating mass 19 is applied to the assembly unit. As a result, the centroid G of the assembly unit can be set at an optimum position, and oscillation at the time of driving the actuator can be set minimum.

9. 发明专利

JPS62149075A MAGNETIC DISK UNIT 失效
公开(公告)号：JPS62149075A
公开(公告)日：1987-07-03
申请号：JP28770385
申请日：1985-12-23
申请人： HITACHI LTD
发明人： TAKAHASHI TAKESHI , KAWAMURA KATSUMI , NARUSE ATSUSHI , SHIMIZU TAKEMASA
IPC分类号： G11B21/02 , F16C19/54 , F16C25/08 , F16C35/06 , F16C41/02 , G11B19/20 , G11B25/04 , G11B33/08
摘要： PURPOSE:To make the unit strong against servo vibration and position a magnetic head accurately by piling up balls interposed between inner rings or outer rings and providing a bearing assembly consisting of plural ball bearings fixed in the state spring energized in axial direction by the balls. CONSTITUTION:An upper side bearing assembly 13 is provided with two piled up ball bearings 15, 16. Outer rings 15a, of ball bearings 15, 16 are in contact with a cylindrical housing 17 and inner rings 15b, 16b are in contact with a sleeve 18 fitted to a shaft 7 slidably in axial direction. On the other hand, a lower bearing assembly 14 has two piled up ball bearings 24, 25. Outer rings 24a, 25a of ball bearings 24, 25 are in contact with a cylindrical housing 26, and inner rings 24b, 25b are in contact with a sleeve 27 fitted slidably to the shaft 7. As inner and outer rings of bearing assembles are stuck fast to the balls pressing them by equal force, each ball bearing receives bearing load equally. Thereby, characteristic frequency of the rotating part becomes high, and becomes strong against servo vibration, and a magnetic head is positioned accurately.

10. 发明专利

JPH01171173A POSITIONING CONTROL SYSTEM 失效
公开(公告)号：JPH01171173A
公开(公告)日：1989-07-06
申请号：JP32701387
申请日：1987-12-25
申请人： HITACHI LTD
发明人： KAWAMURA KATSUMI
IPC分类号： G11B21/10
摘要： PURPOSE:To realize an inexpensive magnetic disk device with excellent oscillation characteristics by attenuating an oscillation by means of an electric control method. CONSTITUTION:Plural compensators A, B and C are set which respectively possess optimum parameters for disturbances which are different according to speed instructions, and when a speed control system is switched to a track tracing control system conforming to the speed instruction, the optimum compensator is selected, and switching is carried out. For example, the phase compensator A has an excellent attenuation for 1,000Hz to indicate open loop characteristics, the compensator B has the excellent attenuation for 500Hz, and the compensator C has the attenuation to a certain extent for 500Hz and 1,000Hz. Thus, even when the condition of the disturbed oscillation is changed, the attenuation can be secured.

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