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公开(公告)号：JP2000137939A
公开(公告)日：2000-05-16
申请号：JP30821898
申请日：1998-10-29
Applicant: IBM
Inventor： SAKAI TATSUYA , TOKIZONO AKIRA , KAGAMI NAOYUKI , KURODA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To provide a disk drive device, a servo controller and a control device, which are capable of contributing to the improvement of performance of the disk drive device. SOLUTION: When data for showing the reproduction level of a servo pattern are supplied from a channel 5 through a servo control part 21, the calculation for the servo control is executed by an SA(servo assist) 23 independently of an MPU 12 and the calculated result is supplied to a VCM(voice coil motor) driving part 6 through a SIO(serial I/O) 22 to drive a head arm 3. The selection is made by an interruption generating part 26 with regard to whether the interruption against the MPU 12 is generated for every reproduction of the servo pattern or the interruption against the MPU 12 is generated based on condition signals from the SC(servo control part) 21, SA 23 and DC(drive control part) 25, according to the selection from the SA 23 or MPU 12.
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公开(公告)号：JP2000132932A
公开(公告)日：2000-05-12
申请号：JP30354398
申请日：1998-10-26
Applicant: IBM
Inventor： KAGAMI NAOYUKI , TOKIZONO AKIRA
Abstract: PROBLEM TO BE SOLVED: To improve stability of head positioning servo to reduce fluctuation of head by including a step to compensate for a position detection signal gain depending on a cyclic loop gain and adequately compensating, not depending on the head, for inclination of PES at the center of MPES and SPES. SOLUTION: PES gain H(x) is read to a PES gain table within a memory. A MPES/SPES calculating means 8b calculates a main position detecting signal using PES gain H(x). Noise is respectively set to a noise table and sine table or the like reserved in the memory. A cyclic loop gain of head is obtained, the PES gain (inclination of PES) itself is compensated depending on deviation from the standard value (average value) of cyclic loop gain and moreover the Cont gain of a servo loop having a large cyclic loop gain is also compensated. Thereby, gradient of PES may be set identical for any head.
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公开(公告)号：JPH1166695A
公开(公告)日：1999-03-09
申请号：JP21864197
申请日：1997-08-13
Applicant: IBM
Inventor： SAKAI TATSUYA , MURAKAMI MASAYUKI , KAGAMI NAOYUKI , NAKAGAWA YUZO
Abstract: PROBLEM TO BE SOLVED: To reduce a processing load of an MPU without increasing costs so much and to easily realize an advanced servo control. SOLUTION: Reproduced levels A, B, C and D of respective burst patterns from a channel 5 is subject to an AD conversion by ADC(A/D converter) 16 and are set to an ADC REG(ADC register) 17. A parameter such as a position error of a head 2 is obtained, independent on an MPU 12, by an SA 23 in accordance with the reproduced levels of the respective burst patterns held in the ADC REG 17 and instructions from the MPU 12, etc., held in an SRAM 24, survo data (DACOUT) for driving a VCM(voice.coil.motor) are computed in accordance therewith and are supplied to a DAC of a VCM driving part 6 via an SIO 22.
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公开(公告)号：JPH04146531A
公开(公告)日：1992-05-20
申请号：JP26398190
申请日：1990-10-03
Applicant: IBM
Inventor： KAGAMI NAOYUKI , KUBO HIROAKI , OKADA KEIICHI , TAKEKOSHI MAKOTO
Abstract: PURPOSE: To prevent a failure in shifting from a seek operation to a track following operation and also a failure of the seek operation by correcting a variation in a feedback amt. at the time of speed control or a variation of a driving signal. CONSTITUTION: A prescribed value is set in a speed profile generator 88 by a controller 200, and a seek in the direction outside a prescribed number of tracks is started. At this time, a timer 400 is simultaneously started to judge whether contents of a track counter 84 is reduced by 100 tracks, and when the 100 tracks are reduced, its required time is measured by the timer 400. In this case, an outside seek TES gain correcting value is evaluated by a prescribed calculating expression to obtain the positive TES gain correcting value if a seek time is shorter than a target time, i.e., a prescribed reference value, and the negative correcting value if larger. By this method, no shifting failure from the seek operation to the track following operation and no failure in the seek operation can be ensured.
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15.发明专利Data storage device, controller, off-track control method and control method 审中-公开数据存储装置，控制器，关闭控制方法和控制方法
公开(公告)号：JP2003346439A
公开(公告)日：2003-12-05
申请号：JP2002156406
申请日：2002-05-29
Inventor： SENBA TETSUO , KAGAMI NAOYUKI , TOKIZONO AKIRA , IKEDO MANABU
CPC classification number: G11B5/5526 , G11B5/5582
Abstract: PROBLEM TO BE SOLVED: To effectively prevent erroneous operation in the correcting operation based on the sensor output by dynamically controlling a gain of a sensor.
SOLUTION: The device is furnished with a servo control part 10 constituting a servo loop for the seek of a head for reading and writing data with respect to a recording medium, a correction signal generation part 20 for generating the correction signal to correct the control by this servo control part 10 on the basis of the output of the specified sensor, and a correction signal control part 30 for predicting the effect obtained when this correction signal is injected to the servo loop and controlling whether this corrected signal is injected to the servo loop or not in accordance with the predicted result. Also, the gain of the sensor is dynamically controlled in accordance with the above predicted result.
COPYRIGHT: (C)2004,JPOAbstract translation: 要解决的问题：通过动态地控制传感器的增益，有效地防止基于传感器输出的校正操作中的错误操作。 解决方案：该装置配有一个伺服控制部件10，该伺服控制部件10构成一个伺服回路，用于寻找一个相对于记录介质读取和写入数据的头部;校正信号产生部分20，用于产生校正信号以校正 该伺服控制部10基于指定的传感器的输出进行的控制，以及校正信号控制部30，用于预测当将该校正信号注入伺服回路时获得的效果，并控制是否将该校正信号注入到 伺服回路或不符合预测结果。 此外，传感器的增益根据上述预测结果动态地控制。 版权所有（C）2004，JPO
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Patent Agency Ranking
公开(公告)号：JP2000134982A
公开(公告)日：2000-05-12
申请号：JP30669998
申请日：1998-10-28
Applicant: IBM
Inventor： SHIMIZU YASUHITO , KAGAMI NAOYUKI , TOKIZONO AKIRA , OYAMA AKIHIRO
Abstract: PROBLEM TO BE SOLVED: To provide a method for starting a spindle motor and a device utiliz ing it which enables the motor to start well even in the spindle motor having the number of poles and slots in the ratio of 4:3, which is liable to cause a starting failure easily. SOLUTION: This method for starting a spindle motor 1 is intended for the spindle motor 1 having the number of poles and slots in the ratio of 4:3, which is liable to cause a starting failure easily. In this spindle motor 1, the timing of a starting is created by breaking down torque balance between a rotor 2 and a stator 3. In this device, by breaking down torque balance between the rotor 2 and stator 3 at the time of starting, leaving from the magnetic balance can be effected immediately at the time of starting, and the starting failure can be avoided. As a result, in a hard disk drive, too, which uses the spindle motor 1 having the number of poles and slots in the ratio of 4:3, which is liable to cause a starting failure easily, the starting time of the hard disk drive can be shortened. Also, this device is provided with a means which breaks down the torque balance between the rotor 2 and stator 3 in starting to create the timing of a starting.
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公开(公告)号：JPH11112289A
公开(公告)日：1999-04-23
申请号：JP26203597
申请日：1997-09-26
Applicant: IBM
Inventor： KAGAMI NAOYUKI , TOKIZONO AKIRA , HIEN FUU DAN , ARN SHARMA , MUTUTANBII SURIIJAYANTA
Abstract: PROBLEM TO BE SOLVED: To prevent filter output from becoming discontinuous at the time of switching a filter characteristic by setting the output value of a delay means with an initial value setting means at the time of changing a filter coefficient by the setting of a coefficient setting means. SOLUTION: The hardware state machine(SM) 29 of a hardware sequencer(SA) 23 calculates respective parameters and judges an operation mode. The SM 29 compares the mode of previous execution, which is held in an inner variable or the like, with a present mode. When the mode is changed, the parameters of the filter characteristics for the respective operation modes, which are stored, are set and the initial value of the inner variable is set. When the filter characteristic is changed, the filter coefficient of the digital filter suddenly changes. Thus, the filter output becomes discontinuous when the inner variable (delay value) until previous time is used as it is. A value Uss obtained by multiplying a value Css estimated to be control output at the time of switching the filter and the gain together is obtained and the delay value is set.
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公开(公告)号：JPH06150335A
公开(公告)日：1994-05-31
申请号：JP28269092
申请日：1992-10-21
Applicant: IBM
Inventor： KAGAMI NAOYUKI , TAKEKOSHI MAKOTO
Abstract: PURPOSE: To surely set a focus by gradually attenuate an offset value at a prescribed level added to a focus error signal in response to the closing of the loop of a focus servo so as to control the focus servo so that an objective lens may always exist in the neighborhoed of a focal position. CONSTITUTION: A disk 100 is rotated by a spindle motor 102 and an optical head 108 is provided with the objective lens 104 and a focus actuator 106 for driving this in a direction vertical to the face of the disk, namely in a focusing direction. The focus error signal is obtained by a focus error signal generator 110 through the use of a astigmatizing method and this error signal is made a so to speak S-curve characteristic near the focal position of the lens 104. A focus servo circuit based on the focus error signal consists of a signal generator 110, a phase compensation circuit 120 and a focus actuator driver 122 and when the loop is closed, the lens 104 is driven vertically to insert the disk surface within the focal depth of the lens 104.
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公开(公告)号：JPH06103587A
公开(公告)日：1994-04-15
申请号：JP4457591
申请日：1991-01-17
Applicant: IBM
Inventor： KAGAMI NAOYUKI , KUBO HIROAKI , NAKASE KOJI
Abstract: PURPOSE: To maintain a still state by operating a controlled variable for moving an optical disk in the radius direction of the optical disk at equal speed on the optical head which is once stopped. CONSTITUTION: A tracking error signal(TES) showing relative displacement quantity against the track of a spot on the optical disk of a laser beam which an object lens 16 emits is transmitted from the optical head 10 to a track counter 26, and a generated number is given to a micro processor 30. The processor 30 has a timer 32 and an analog value by the D/A converter 34 of the digital value of the controlled variable for controlling the head 10 is given to a VCM (voice coil motor) driver 38 through a switch 36. The driver 38 gives driving voltage or driving current based on the analog value to VCM 24. A servo control part 42 controls VCM 24 so that a relative rotary angle against the linear actuator 14 of a rotary actuator 12 becomes zero. Thus, the still state can be maintained.
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公开(公告)号：JPH04139669A
公开(公告)日：1992-05-13
申请号：JP25546990
申请日：1990-09-27
Applicant: IBM
Inventor： KAGAMI NAOYUKI , KUBO HIROAKI , UENO SHIGEO
Abstract: PURPOSE: To surely position an optical disk driving device even if an optical disk is inclined by adding/reducing speed of an optical pickup with the use of a tracking error signal. CONSTITUTION: An optical pickup 3 is moved outward after it is pressed to a position where no track guiding groove is formed inside an optical disk 5. Then, a tracking error signal is detected by a tracking sensor 15, with a track counter 21 calculating the number of crossing of the track guiding groove. The crossing state is monitored for the pickup 3 of the track guiding groove by constantly checking this discrete value, so that an adding/reducing/stopping control of the pickup 3 is carried out by CPU 20. Accordingly, without detecting the absolute position using a scale, the initial adjustment of the optical pickup is performed well by surely positioning the disk driving device without complicating the structure even when the pickup is inclined.
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