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公开(公告)号：JPH08328664A
公开(公告)日：1996-12-13
申请号：JP13524395
申请日：1995-06-01
Applicant: IBM
Inventor： KISAKA MASASHI
Abstract: PURPOSE: To surely control the position of an object to be controlled without deteriorating the safety of a control system even when the frequency of a repeated error is high. CONSTITUTION: A digital filter 86 the gain of which becomes a peak against a frequency component in a narrow band containing a prescribed angular frequency ω0 and nearly zero against a frequency component outside the narrow band is provided to a main control section 68 which inputs a head position signal y(n) digitally indicating the size and direction of the deviation of the present position of a magnetic head from the target position of the head at every sampling period Ts and generates and outputs a motor current control signal u(n) digitally indicating the controlled variable of a motor current so that the head position signal y(n) can be inputted to the filter 86. In addition, a phase changing section 88 which outputs the signal outputted from the filter 86 by delaying the phase of the signal by 5Ts is provided to the section 68 so that the phase-delayed signal can be added to the signal u(n) through an adding point 74.
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公开(公告)号：JPH08106741A
公开(公告)日：1996-04-23
申请号：JP23573694
申请日：1994-09-29
Applicant: IBM
Inventor： KISAKA MASASHI , AMANO YOSHIRO
Abstract: PURPOSE: To discriminate the position of a head without error. CONSTITUTION: Data tracks 54 are formed concentrically on a magnetic disk, and identification information for identifying data tracks is recorded corresponding to the tracks on track information identification area 56. The information is formed of first and second gray code, first code has bit number of (n-1) bits (n is bit number of the track address), and each block is decided so that the values are different at each of a plurality of the blocks formed of a plurality (2 in the drawing) of the data tracks. The second code has bit number of 3 bits, being different at each adjacent data track along the radial direction of the disk, and decided at each data track to express the value circulated at each block of three (four in the drawing) series in the radial direction of the disk. The position of the head is discriminated based on the first and second codes read by the head.
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公开(公告)号：JP2004086959A
公开(公告)日：2004-03-18
申请号：JP2002244238
申请日：2002-08-23
Applicant: Internatl Business Mach Corp
, インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation Inventor： KISAKA MASASHI
CPC classification number: G11B5/59622 , G11B5/5526 , G11B7/08505 , G11B2005/001
Abstract: PROBLEM TO BE SOLVED: To reduce the influence of a resonance frequency of an actuator, etc., while suppressing the deterioration of the servo control performance.
SOLUTION: By using a band-pass filter constituted of an APF (all pass filter) 31 and a 2nd adder 33, an APF 34 and a multiplier 35, the detection is made as to how much the present resonance frequency of the actuator is deviated from the set value of the center frequency of the APF 31, the center frequency of the APF 31 is appropriately adjusted based on the detection result. By adjusting the center frequency of the APF 31 in such a manner, the center frequency of a notch filter which is constituted of the APF 31 and a 1st adder 32 can be automatically brought closer to the resonance frequency of an actuator 5 in the present state.
COPYRIGHT: (C)2004,JPO-
14.发明专利
公开(公告)号：JP2004070603A
公开(公告)日：2004-03-04
申请号：JP2002227864
申请日：2002-08-05
Applicant: Internatl Business Mach Corp
, インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation Inventor： KISAKA MASASHI , SHIMIZU YASUHITO
IPC: G06F1/26
Abstract: PROBLEM TO BE SOLVED: To reduce any wasteful power consumption, and to maintain the interchangeability of a conventional system main body and external connecting equipment. SOLUTION: A notebook-sized PC 1 is provided with a PC main body 10 having a 3.3V power source 14 for supplying a voltage which is DC3.3V to an HDD 20 and a 5V power source 15 for supplying a voltage which is DC5.5V and an HDD 20 having an MPU 21 and I/O controller 22 operating with the DC3.3V and a spindle motor 24 and VCM 25 operating with the DV5V. The PC main body 10 supplies the DC5V from the 5V power source 15 to the HDD 20, and then decides whether or not the DC3.3V should be supplied from the 3.3V power source 14 based on the operating condition of the HDD20 to which the DC5V is supplied. COPYRIGHT: (C)2004,JPO
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15.发明专利
公开(公告)号：JP2003304694A
公开(公告)日：2003-10-24
申请号：JP2002102371
申请日：2002-04-04
Inventor： KISAKA MASASHI
CPC classification number: G11B5/59605 , G11B5/5526
Abstract: PROBLEM TO BE SOLVED: To realize a rotation control strong with respect to the influence of a disturbance by raising a gain of a controller, while absorbing an unevenness of a magnet position in a motor. SOLUTION: An apparatus for controlling a rotation comprises a spindle motor 3 for rotatably driving a predetermined object to be driven; a controller 121 for controlling a rotary drive of the motor 3, by comparing a pulse time in the rotary drive of the motor 3 with a predetermined target time; and a peak filter 122 for dynamically changing the target time so as to suppress the rotary frequency included in the waveform of the drive current of the motor 3 and correcting the control by the controller 121. COPYRIGHT: (C)2004,JPO
Abstract translation: 要解决的问题：通过提高控制器的增益来实现相对于扰动的影响的旋转控制，同时吸收电动机中的磁体位置的不均匀性。 解决方案：用于控制旋转的装置包括：主轴电动机3，用于可旋转地驱动预定的被驱动物体; 控制器121，用于通过将马达3的旋转驱动中的脉冲时间与预定的目标时间进行比较来控制马达3的旋转驱动; 以及峰值滤波器122，用于动态地改变目标时间，以便抑制包括在电动机3的驱动电流的波形中的旋转频率并校正控制器121的控制。版权所有（C）2004，JPO
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Patent Agency Ranking
公开(公告)号：JPH11126443A
公开(公告)日：1999-05-11
申请号：JP27709697
申请日：1997-10-09
Applicant: IBM
Inventor： KISAKA MASASHI , OZAWA YUTAKA , TSUCHIMOTO KAZUNARI
Abstract: PROBLEM TO BE SOLVED: To provide a disk drive, disk control method, data reading/writing method, data arranging method, and a disk-like storage medium, which are capable of preventing a nonlinear movement or the increase of the friction of a bearing even though the width of one track becomes further narrower. SOLUTION: In the magnetic disk 11 of a disk drive device 10, LBAs(logical block addresses) are read/written in such a manner that a 1st track including a specified number of continuous LBAs, a 2nd track including a specified number of continuous LBAs in succession of the specified number of continuous LBAs, and at least one track between the 1st track and 2nd track are provided when n pieces of LBAs are included per one track, and in a control part 22, the seek operation is carried out so that the track to read/write the next data is to be the track separated more than one track at least when the continuous data are read/written by moving the track.
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公开(公告)号：JPH05109220A
公开(公告)日：1993-04-30
申请号：JP29487591
申请日：1991-10-16
Applicant: IBM
Inventor： KISAKA MASASHI
Abstract: PURPOSE: To converge head positioning at a high speed by changing the gain of a control system for which an input signal value and a control signal value are state variables only at the time of switching a mode. CONSTITUTION: In response to the input signal value y (m) for indicating a difference between a present head position and a target track, the control signal value u (m) for driving a motor is outputted and a head is positioned to the target track. In the control system for which the input signal value y (m) and the control signal value u (m) are the state variables, in order to the quickly position the head to the target track, an initial value is added to the control signal value u (m) and the gain is changed only at the time of switching the mode. The initial value, a feedforward value r0, is generated by multiplying prescribed coefficients L1-L4 to the input signal value y (m) at the time of switching the mode, a signal value y (m-1) and the control signal value u (m-1) one before and the control signal value u (m-2) two before.
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公开(公告)号：JPS63273281A
公开(公告)日：1988-11-10
申请号：JP10021687
申请日：1987-04-24
Applicant: IBM
Inventor： KISAKA MASASHI
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公开(公告)号：JP2003109336A
公开(公告)日：2003-04-11
申请号：JP2001290031
申请日：2001-09-21
Applicant: IBM
Inventor： KISAKA MASASHI
Abstract: PROBLEM TO BE SOLVED: To realize stable operation within a practical range in a rotary recorder provided with a shock sensor and for obtaining a feedforward signal by adaptively processing an output of the shock sensor. SOLUTION: In this rotary recorder in which a VCM system whose transfer function is represented with G and a controller whose transfer function is represented with H configures feedback, a signals of the shock sensor S is subjected to band limitation with a bandpass filter F, and an output (feedforward control signal ff) of an adaptive filter FIR is obtained by using a signal (f) that has been subjected to band limitation. For a signal to be inputted to a parameter adaptive algorithm PAA, a signal (p) obtained by shifting the phase of the signal (f) with a phase shift filter P is used. The phase of the phase shift filter P coincides with the phase of G/(1+GH) within the range of ±90 deg. within a limited band.
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公开(公告)号：JP2003109331A
公开(公告)日：2003-04-11
申请号：JP2001290030
申请日：2001-09-21
Applicant: IBM
Inventor： KISAKA MASASHI
Abstract: PROBLEM TO BE SOLVED: To adaptively and stably update feedforward quantity in the case of performing sine wave driving of head driving of a rotary recorder. SOLUTION: In this rotary recorder in which a VCM system whose transfer function is represented with G and a controller whose transfer function is represented with H configure feedback, a target position locus in each seek command is generated by using a lamp function and a composite function of a sine wave function. A sine wave component at a target position is inputted to an adaptive filter R in which a coefficient is adaptively updated to be a feedforward signal (r). A signal that has passed through a filter (1-1/z) for removing components other than the sine wave component is inputted to a parameter adaptive algorithm PAA for adaptively updating a coefficient as an input.
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