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公开(公告)号：JPH1116267A
公开(公告)日：1999-01-22
申请号：JP17056697
申请日：1997-06-26
Applicant: IBM
Inventor： YONEDA ISAO , UCHIIKE HIROSHI , UENO SHINJI , OGASAWARA KENJI
Abstract: PROBLEM TO BE SOLVED: To provide a disk drive device, a loading/unloading device and its control method wherein data reliability is increased by performing stable speed control. SOLUTION: A disk drive device 10 is provided with a VCM spindle driver 12 for rotary-driving a disk 11, an actuator mechanism 14 for moving a head slider having a magnetic head 13 above the surface of a magnet disk 11 and to a retreating position, a lamp block 15 and a CPU/HDC 16 for controlling operations including loading/unloading control, control for the speed of the actuator or data reading/writing in the disk 11. Before performing speed control for loading the actuator on a recording medium, a proper rectangular current wave is first applied so as to release the actuator from its static state by an open loop, then the movement of the actuator caused by the application of the rectangular current wave is immediately measured, whether a proper initial speed is obtained or not is determined and, when a proper initial speed is not obtained, a rectangular current wave is applied again and then the initial condition of speed control is decided based on the measuring result.
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公开(公告)号：JPH1116259A
公开(公告)日：1999-01-22
申请号：JP16729697
申请日：1997-06-24
Applicant: IBM
Inventor： UCHIIKE HIROSHI , OGASAWARA KENJI , AMANO YOSHIRO , SHIMIZU MASAHIRO , KURIHARA SHUSUKE , TSUCHIMOTO KAZUNARI , KITAZAKI NOBUYUKI , UENO SHINJI , YONEDA ISAO , YOKOE YUJI , SAI FUMINORI
Abstract: PROBLEM TO BE SOLVED: To prevent a head slider from accidentally landing. SOLUTION: The head slider provided with a transducer head is mounted on a head arm of the head mechanism and loaded on a disk by the turning of the head arm and also unloaded to the retreating position out of the disk from on the disk. A shock sensor is provided for sensing the shock received by the head mechanism from the outside. The loading operation of the head slider is started at a step S2, and when the shock is sensed at a step S3 during the loading operation, the loading is stopped at a step S5 and the unloading is carried out at a step S6 to return the head slider to the retreating position. When the unloading operation at the step S6 is finished, the head slider is returned to the step S2 and the reloading is started.
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公开(公告)号：JPH1125627A
公开(公告)日：1999-01-29
申请号：JP17443597
申请日：1997-06-30
Applicant: IBM
Inventor： KITAZAKI NOBUYUKI , AMANO YOSHIRO , OGASAWARA KENJI , UENO SHINJI
Abstract: PROBLEM TO BE SOLVED: To surely unload a head slider. SOLUTION: A transistor Tr5 is made to be in ON. When a main power source Vdd is turned OFF at a time t1, transistors Tr1, Tr2 and a diode D1 are turned OFF and the level of a control signal Ret becomes higher than threshold voltages Vth of transistors Tr3, Tr4 to turn transistors Tr3, Tr4 OFF. Moreover, a capacitor C1 starts a discharge. A control signal InRet changes to 'L' level and a control signal OutRet does not change while being kept in 'L'. As a result, an IR(inner retract) driver 133aa makes the VCM(voice coil motor) current of a negative polarity flow through a voice coil 5 to preliminarily move a head arm to a direction opposite to an unload direction. Next, when it becomes a time t2 and the level of the control signal Ret becomes the level of not larger than the threshold voltages Vth, the control signals InRet and OutRet both change to 'H' and the IR driver 13aa stops the operation and an OR(outer retract) driver 13ab reverses the moving direction of the head arm by making the VCM current of a possitive polarity flow through the voice coil 5.
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Patent Agency Ranking
公开(公告)号：JPH1116136A
公开(公告)日：1999-01-22
申请号：JP17156997
申请日：1997-06-27
Applicant: IBM
Inventor： YONEDA ISAO , UCHIIKE HIROSHI , UENO SHINJI , OGASAWARA KENJI
Abstract: PROBLEM TO BE SOLVED: To prevent the occurrence of an accidental unloading. SOLUTION: The head slider having a converter head is mounted on a head arm. If the arm is rotated, the slider is unloaded from a disk. The retracting position is located at the boundary section within the rotating range of the arm. If the slider is normally unloaded to the retracting position, the arm does not move even though a driving force is applied to the head arm in an unloading direction. Then, an unloading is executed in a step S2, a position confirmation driving force is applied to the arm in the unloading direction, the moving speed of the slider is detected in a step S4 and discrimination is made in a step 5 to determine whether the slider is unloaded to the retracting position or not based on the movement speed. If the slider is not unloaded at the retracting position, a re-unloading is executed in a step S7 to move the slider back to the retracting position.
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公开(公告)号：JP2002026468A
公开(公告)日：2002-01-25
申请号：JP2000199768
申请日：2000-06-30
Applicant: IBM
Inventor： TANIMURA HIROTOSHI , OTSUBO KEIICHI , UENO SHINJI
Abstract: PROBLEM TO BE SOLVED: To approximately uniformly bond a heat dissipating surface of a heat generating component to a heat transfer surface of a printed wiring board to obtain efficient heat dissipation and approximately closely bond the heat dissipating surface of a heat generating electronic component to the heat transfer surface of the printed wiring board to avoid leaving voids. SOLUTION: The printed wiring board 10 for mounting electronic components 26 comprises a heat transfer surface 12 for conducting heat of the electronic components 26 and solder regions 14 formed by sectioning the heat transfer surface 12 into a plurality of independent regions and depositing solder respectively to the plurality of regions, thus forming the board 10.
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公开(公告)号：JPH09223363A
公开(公告)日：1997-08-26
申请号：JP2905596
申请日：1996-02-16
Applicant: IBM
Inventor： UENO SHINJI , IIHARA YASUHIRO , ANDO HARUO , NAKAMURA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To efficiently perform data reassigning in a disk device. SOLUTION: In data reassignment processing for moving reading or writing error data in the disk device from an error generation sector position to an alternative region on a disk and recording this, the execution of data reassigning is decided by referring to the remaining capacity of the alternative region in order to efficiently use the alternative region. When the remaining capacity of the alternative region is large, the condition of data reassigning is relaxed and when there is not much remaining capacity, the condition of data reassigning is set strict, only data satisfying a particular condition is moved to the alternative region and for data other than this, only data recovery is performed according to an error recovery procedure(ERP). Thus, the too early disappearance of the alternative region is prevented.
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公开(公告)号：JPH1125626A
公开(公告)日：1999-01-29
申请号：JP17184997
申请日：1997-06-27
Applicant: IBM
Inventor： YONEDA ISAO , UCHIIKE HIROSHI , UENO SHINJI , OGASAWARA KENJI , AOKI YOSHIHIKO , SAI FUMINORI
Abstract: PROBLEM TO BE SOLVED: To provide a disk drive device, a load/unload device and its control method performing stable speed control and improving reliability in data. SOLUTION: The disk drive device 10 is provided with a VCM(voice coil motor) spindle driver 12 rotation driving a disk 11, a magnetic head 13, an actuator mechanism 14 moving a head slider having the magnetic head 13 over the magnetic disk 11 surface and to a retreat position, a lamp block 15 and a CPU/HDC (hard disk controller) 16 controlling a speed of an actuator, controlling calibration detecting offset and dynamic range of an AD(analog/digital) converter prior to this speed control and controlling operation such as read-out/ write-in, etc., of data for the disk 11. Then, the device 10 increases a rectangular current value applied to a voice coil while successively changing a code, and measures the offset from the value of the AD converter at every current value, and decides it is a nonlinear area when a difference between the expected value and the measured value of the AD converter becomes a prescribed value or above to measure the dynamic range.
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公开(公告)号：JPH10334626A
公开(公告)日：1998-12-18
申请号：JP12853997
申请日：1997-05-19
Applicant: IBM
Inventor： OGASAWARA KENJI , SAI FUMINORI , UENO SHINJI , YONEDA ISAO
Abstract: PROBLEM TO BE SOLVED: To prevent the adhesion of a head/slider assembly to the surface of a magnetic recording disc when the air pressure in the using environment is lowered. SOLUTION: When this method is used, a head flies on a disc 1, a head supporting arm 4 is moved along the diagonal direction of the disc 1 and a disc driving device positions the head to one of the cylinder positions of the disc 1. In this case, the air pressure at the part where the device set is detected during the power-on-reset period. The value is compared with a threshold value. Whether the operation for lowering the flying height of the head to the height lower than height for operation during the reading/writing period is prohibited or is not judged. In the detection, the current required for retaining the head at the selected cylinder position is detected and compared with the reference current value for retaining the head at the cylinder position at the reference air pressure. The value of the difference is generated and compared with the threshold value. The step for generating the information is included.
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