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1. 发明专利

JP2003162834A OPTICAL DISC DRIVE 审中-公开
公开(公告)号：JP2003162834A
公开(公告)日：2003-06-06
申请号：JP2001360240
申请日：2001-11-27
申请人： HITACHI LTD , HITACHI LG DATA STORAGE INC
发明人： IIJIMA KOJI , SUZUKI MOTOYUKI , IMAGAWA SEIJI
IPC分类号： G11B7/095
摘要： PROBLEM TO BE SOLVED: To provide a control device that can improve tracking and focusing of an optical disc drive against defects by correcting errors in servo signals based on the tracking or focusing errors caused by the defects. SOLUTION: The optical disc drive of this invention has a signal processing means that finds defects based on the optical signals received from a disc and makes calculation for the tracking or focusing servo signals when there are any defects or no defect. When there are defects, it sample-and-holds the low frequency components of the servo signals right before the defects are found, and adds eccentricity correction signals or surface wobble correction signals. It also adds reverse polarity signals and brake signals to the above sum signals right after the defects are found. COPYRIGHT: (C)2003,JPO

2. 发明专利

JP2002093032A OPTICAL DISK UNIT 失效
公开(公告)号：JP2002093032A
公开(公告)日：2002-03-29
申请号：JP2000276600
申请日：2000-09-07
申请人： HITACHI LTD
发明人： IMAGAWA SEIJI , SUZUKI MOTOYUKI , ONO HIROAKI , IIJIMA KOJI , NARITA YOSHIO
IPC分类号： G11B20/10 , G11B19/00 , G11B19/28
摘要： PROBLEM TO BE SOLVED: To provide an optical disk unit which intermittently records and reproduces data and is equipped with a low-noise, low-power spindle motor control function by equipping the optical disk unit with two spindle control systems. SOLUTION: This unit is composed of a spindle motor, a frequency detecting means, a 1st motor control means, a 2nd motor control means including a computing element, a serial communication device and a programmable DA converter, a system controller, a switching means, and a motor driving means. As spindle motor control, rotational frequency control using a feedback loop system is performed during recording and reproducing operation and constant- voltage driving using an open-loop system is carried out at an intermittent operation stop. Further, reference signals for respective driving voltages are generated independently to reduce the noise of a spindle at startup time while reducing the electric power of the drive. The reliability and operability of the drive can, therefore, be improved.

3. 发明专利

JP2001118271A SURFACE WOBBLE CORRECTION AND CONTROL METHOD, ECCENTRICITY CORRECTION AND CONTROL METHOD, AND OPTICAL DISK DEVICE USING THEM 失效
公开(公告)号：JP2001118271A
公开(公告)日：2001-04-27
申请号：JP29760199
申请日：1999-10-20
申请人： HITACHI LTD
发明人： IMAGAWA SEIJI , SUZUKI MOTOYUKI , ONO HIROAKI
IPC分类号： G11B7/095 , G11B19/247 , G11B19/28
摘要： PROBLEM TO BE SOLVED: To inexpensively realize a surface wobble and eccentricity correction control provided with high operability by repeatedly using a surface wobble correction signal and an eccentricity correction signal generated after a disk is loaded until the disk is exchanged or re-loaded in the next time and eliminating re-detection even when the disk stops. SOLUTION: A signal synchronized with the rotational frequency of an optical disk is identified based on the rotational phase information of the optical disk, and the surface wobble and eccentricity correction data are generated to be preserved, and by outputting the preserved surface wobble correction data based on the signal synchronized with the rotational frequency, the surface wobble is corrected.

4. 发明专利

JP2000217068A INFORMATION RECORDER 失效
公开(公告)号：JP2000217068A
公开(公告)日：2000-08-04
申请号：JP1397099
申请日：1999-01-22
申请人： HITACHI LTD
发明人： IMAGAWA SEIJI , ONO HIROAKI , SUZUKI MOTOYUKI , KATSUKI MANABU
IPC分类号： H04N5/765 , G11B20/10 , H04N5/781 , H04N5/91
摘要： PROBLEM TO BE SOLVED: To perform coping even when a recording operation is stopped for a long period of time by recording image information as intermittent still image information when a recording capacity exceeds a target value. SOLUTION: A recording means a4 records compressed information outputted from the recording means b3. When the recording means a4 is incapable of recording due to vibration or the like, the recording capacity of the recording means b3 increases and exceeds a prescribed amount (a). A controller 5 detects that the prescribed amount (a) is exceeded and outputs abnormality signals (a) to a display means a7. When the recording capacity increases and exceeds the prescribed amount b, a control means 5 outputs the abnormality signals b. A signal processing means 2 generates the compressed information of the still images of a fixed cycle from the image information from an input means 1 and outputs it to the recording means b3 and a display device a7. In such a manner, intermittent still images are recorded as the image information. At the point of time at which the recording capacity of the recording means b3 reaches the prescribed amount c, the controller 5 outputs abnormality information c to the recording means b3 and the display means a7 and the recording means b3 stops new recording, and when the recording means a4 becomes recordable, outputs pseudo end information together with holding information.

5. 发明专利

JPH11219550A TAPE TENSION DETECTING MECHANISM 失效
公开(公告)号：JPH11219550A
公开(公告)日：1999-08-10
申请号：JP2062998
申请日：1998-02-02
申请人： HITACHI LTD
发明人： ETATSU YASUO , KAKU NOBUYUKI , MASUOKA NOBUO , FUJITA KOJI , IMAGAWA SEIJI
IPC分类号： G11B15/43
摘要： PROBLEM TO BE SOLVED: To suppress a tension drift due the change of a tape winding diameter from being generated by arranging a magnetic force generating means and a magnetic force detecting means three-dimensionally and making the change of an output due to the change of the magnetic force of the magnetic force detecting means to be roughly linear in the rotational range of a tension arm while displacing one side of the magnetic force generating means or the magnetic force detecting means relatively by tension. SOLUTION: At the time of the prescribed tension of a state B, a Hall device 5 is arranged at the roughly center of a magnet 3 and a magneti 4 and its output becomes zero. When tension becomes high, a tension arm 1 is rotated to the right direction and the balanced state of the arm 1 becomes to be in a state A. At this time, the magnet 3 whose N pole is opposed to the hole element 5 approaches the device 5 and the output voltage of the device 5 becomes a positive. When the tension becomes low, the magnet 4 whose S pole is opposed to the element 5 approaches the element 5 and the output voltage of it becomes negative. Thus, the relation of the output voltage with respect to the rotational angle of the arm 1 is made to be linear by arranging the magnets 3, 4 while allowing their poles different each other to be opposed to the Hall device 5.

6. 发明专利

JPH08167201A TAPE TRAVELING SPEED CONTROLLER 失效
公开(公告)号：JPH08167201A
公开(公告)日：1996-06-25
申请号：JP30456894
申请日：1994-12-08
申请人： HITACHI LTD
发明人： IMAGAWA SEIJI , HIGUCHI SHIGEMITSU , FUJITA KOJI , SUGA ATSUO , KATSUKI MANABU
IPC分类号： G11B15/43 , G11B15/46
摘要： PURPOSE: To shorten the time required for recovering stable traveling and also to shorten a state transition time by performing tape traveling control using a control signal obtained at the time of the stable traveling. CONSTITUTION: Tension data (d) as a deflection angle of a tension sensor arm 6 detected by a detector 9 when the traveling becomes unstable is inputted to a tape traveling state discriminator 26. If it exceeds a prescribed range, switches 16 and 21 are changed to take out previous speed error data (g) and (h) from memories 17 and 22 respectively in place of present tape speed error data (b) and (f), and these data (g) and (h) are supplied to motor drive amplifiers MDAs 18 and 23, while they are stored again in the memories 17 and 22. Then, at the time of changing modes, a wound diameter of a reel 2 is calculated by a calculator 28 from count values of counters 10 and 11 and a total wound area, and is stored in a memory 29. If a tape speed is changed by changing modes, the speed is inputted via a switch 30 to a speed error calculator 32, where an error is calculated and supplied to an MDA 18 to perform speed control.

7. 发明专利

JP2007080402A Optical disk device 审中-公开
标题翻译：光盘设备
公开(公告)号：JP2007080402A
公开(公告)日：2007-03-29
申请号：JP2005267860
申请日：2005-09-15
申请人： Hitachi Ltd , Hitachi-Lg Data Storage Inc , 株式会社日立エルジーデータストレージ , 株式会社日立製作所
发明人： IMAGAWA SEIJI
IPC分类号： G11B7/085 , G11B7/125
CPC分类号： G11B7/1378 , G11B7/08511 , G11B7/13925 , G11B2007/0013
摘要： PROBLEM TO BE SOLVED: To solve the problem that it takes time to perform the processing operation of an aberration correcting element in the interlayer movement of a multilayer disk and in a device initialization operation in an optical disk device needing the aberration correcting element for correcting a spherical aberration. SOLUTION: The optical disk device using a pickup comprises a focus actuator for moving an objective lens in a disk rotary shaft direction, a tracking actuator for moving the objective lens in a disk radial direction, an aberration correcting means for correcting the aberration and a feed means for moving the pickup in the disk radial direction, and the control operation of the aberration correcting means and the control operation of the feed means are performed in parallel. COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题为了解决在多层盘的层间移动中执行像差校正元件的处理操作需要时间的问题以及需要像差校正元件的光盘装置中的器件初始化操作的问题用于校正球面像差。解决方案：使用拾取器的光盘装置包括用于沿盘旋转轴方向移动物镜的聚焦致动器，用于沿盘径向移动物镜的跟踪致动器，用于校正像差的像差校正装置以及用于在盘的径向方向上移动拾取器的进给装置，并行地执行像差校正装置的控制操作和进给装置的控制操作。版权所有（C）2007，JPO＆INPIT

8. 发明专利

JP2004164787A Optical disk device 审中-公开
公开(公告)号：JP2004164787A
公开(公告)日：2004-06-10
申请号：JP2002331831
申请日：2002-11-15
申请人： Hitachi Ltd , Hitachi-Lg Data Storage Inc , 株式会社日立エルジーデータストレージ , 株式会社日立製作所
发明人： IMAGAWA SEIJI , SUZUKI MOTOYUKI , IIJIMA KOJI
IPC分类号： G11B7/085 , G11B7/095
摘要： PROBLEM TO BE SOLVED: To shorten a processing time for sweeping operation in pulling-in a focus servo and adjusting a focus amplitude, and also to prevent the pulling-in of the focus servo from failing due to the wobbling and vibration of the disk.
SOLUTION: In the pulling-in of the focus servo of the optical disk, and amplitude adjustment of an inter-focus layer jumping or focus error signal, an optical spot position and moving speed are accurately controlled by providing an objective lens with micro-vibrations by a high-frequency signal, comparing the phase of the high-frequency component of the focus error signal with that of the original high-frequency signal, and discriminating between the positive feedback area and the negative feedback area of an S-character signal, and thereby not only the operational stability is improved, but also the processing time is shortened.
COPYRIGHT: (C)2004,JPO

9. 发明专利

JP2002092912A OPTICAL DISK DEVICE 失效
公开(公告)号：JP2002092912A
公开(公告)日：2002-03-29
申请号：JP2000276602
申请日：2000-09-07
申请人： HITACHI LTD
发明人： IIJIMA KOJI , IMAGAWA SEIJI , ONO HIROAKI
IPC分类号： G11B7/095
摘要： PROBLEM TO BE SOLVED: To provide an optical disk device in which the followup performance of a focus and a tracking control system is improved by generating a surface wobbling signal and an eccentricity correcting signal on the basis of the frequency characteristics of a feedback control system and a vibration level in an actuator. SOLUTION: In an actuator control system which has a memory means to store the frequency characteristics of the control system and a vibration detecting means to detect the vibration of an actuator and which detects and corrects surface wobbling and eccentricity components, the followup performance of a focus and a tracking control system can be improved by operating so that surface wobbling and eccentricity correcting signals are generated in consideration of the frequency characteristics and vibration of the feedback control system.

10. 发明专利

JP2001344786A OPTICAL DISK DEVICE 失效
公开(公告)号：JP2001344786A
公开(公告)日：2001-12-14
申请号：JP2000161118
申请日：2000-05-26
申请人： HITACHI LTD
发明人： IIJIMA KOJI , IMAGAWA SEIJI , ONO HIROAKI
IPC分类号： G11B7/095
摘要： PROBLEM TO BE SOLVED: To reduce motion sound caused by the movement of an objective lens driven by an actuator, in the case where vibration, face wobbling of an optical disk, and eccentricity that are above the allowable level are detected in the optical disk device. SOLUTION: The device is constituted of a disk motor, rotational frequency generating means, disk motor control means, focus actuator, tracking actuator, focus error signal detecting means, focus control signal generating means, tracking error signal detecting means, tracking control signal generating means, actuator frequency characteristics setting means, wobbling correcting signal generating means, and eccentricity correcting signal generating means. The frequency characteristics of an actuator control loop is set to the absolute minimum, the motion sound caused by the movement of the objective lens driven by the actuator is reduced, the focus and tracking error signal levels are monitored constantly, and, focus control and tracking control are interrupted, thus, the motion sound can be reduced.

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