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1. 发明专利

JPH06203390A OPTICAL DISK 失效
公开(公告)号：JPH06203390A
公开(公告)日：1994-07-22
申请号：JP35867592
申请日：1992-12-28
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： MURAOKA KOJI , SUENAGA KIYOYUKI , GONDO HIROYUKI , SAKATA SHINGO
IPC分类号： G11B7/085 , G11B7/095 , G11B21/10
摘要： PURPOSE:To make a high-band and high-function servo control even at the time of high-speed rotation of the optical disk by controlling the optical pickup by a 3rd control signal with the 1st and 2nd control signals added. CONSTITUTION:A focusing servo high frequency band compensating means 67 leads, the phase of an inputted focusing error signal 19 by 60 deg.. The means 67 shows the good phase characteristic without phase lag in the arithmetic delay time and control signal hold because of its analog circuit. In a normal servo state reading and writing the signal on an optical disk 1, when a vibration is applied from outside on a focusing servo means 100, an enough open loop gain causing no focus blurring is required. Thus, a focusing servo low-frequency band gain increasing means 78 can change the filter constant so as to increase the gain in the vibration frequency band 1-500Hz by few decibels. Further, a control signal addition means 69 adding the control signals outputted by the means 67 and 78 is provided to enable both the high servo band and the high function compensation.

2. 发明专利

JPH0636484A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH0636484A
公开(公告)日：1994-02-10
申请号：JP18648492
申请日：1992-07-14
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SUENAGA KIYOYUKI , GONDO HIROYUKI , MURAOKA KOJI , SAKATA SHINGO
IPC分类号： G11B7/085 , G11B21/08
摘要： PURPOSE:To improve detection accuracy in a moving speed in an optical pickup in the access operation of an optical disk device. CONSTITUTION:By a controller 39, the outputs of a first speed detection circuit 36 and a second speed detection circuit 37 are selected by inputting a speed detector selection signal 50 to a speed detection value selector 41 according to a moving speed detection value 48 in the pickup. Then, stable access operation at a high speed is performed by controlling the moving speed with high accuracy.

3. 发明专利

JPH064989A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH064989A
公开(公告)日：1994-01-14
申请号：JP16242592
申请日：1992-06-22
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SAKATA SHINGO , GONDO HIROYUKI , SUENAGA KIYOYUKI , MURAOKA KOJI
IPC分类号： G11B7/00 , G11B7/004 , G11B7/095 , G11B19/04 , G11B19/20
摘要： PURPOSE:To provide a highly precise position control even when a low performance servo control system and an optical pickup are used by changing the relative loading position of an optical disk on a spindle motor. CONSTITUTION:A disk deviation detector 22 which detects the eccentricity and the wobbling surface of an optical disk 1 and outputs signals and a position change signal generator 23 are provided. The detector 22 detects a maximum amount of eccentricity of the disk 1 including the eccentricity of a spindle motor 2 from the size of tracking error signals while a tracking servo is turned on. One revolution of the disk 1 is equally divided by reference pulses, the position of the maximum eccentricity of the disk 1 is judged and the position at which the maximum amount of eccentricity is generated is outputted to the generator 23. The generator 23 outputs the signal which shows the position change to an automatic loading mechanism 3. The mechanism 3 unloads the disk 1 from the motor 2 after the motor 2 stops, rotates the motor 2 with prescribed number of reference pulses and again reloads the disk 1 onto the motor 2 so as to change the relative position.

4. 发明专利

JPH05325447A MOVING SPEED DETECTING DEVICE FOR OPTICAL PICKUP 失效
公开(公告)号：JPH05325447A
公开(公告)日：1993-12-10
申请号：JP13652692
申请日：1992-05-28
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： MURAOKA KOJI , SUENAGA KIYOYUKI , GONDO HIROYUKI , SAKATA SHINGO
IPC分类号： G11B21/08
摘要： PURPOSE:To detect a good pickup moving speed even in the case of signal disorder by correcting the pickup moving speed when a track transverse signal goes out of order due to a preformat area. CONSTITUTION:A reference signal generating means 14 generates a reference signal 15 for showing preformat area irradiation with a light spot at the time of track follow-up operation. Also, a predictive window signal generating means 16 generates a predictive window signal for showing the preformat area irradiation with the light spot from the reference signal 15 at the time of access operation. On the other hand, a track transverse signal detecting means 6 detects a track transverse signal 7 and a periodic signal generating means 8 generates a periodic signal 9 from a period of the track transverse signal 7. Moreover, since an optical pickup moving speed detecting means 18 generates a pickup moving speed signal from the periodic signal 9 and corrects it by the predictive window signal 17, influence of light reflection factor of a preformat area can be eliminated.

5. 发明专利

JPH05166195A FOCUS SERVO DEVICE 失效
公开(公告)号：JPH05166195A
公开(公告)日：1993-07-02
申请号：JP33503691
申请日：1991-12-18
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SUENAGA KIYOYUKI , GONDO HIROYUKI , MURAOKA KOJI , FUJISHIMA TOSHIHIRO , SAKATA SHINGO
IPC分类号： G11B7/085 , G11B7/09
摘要： PURPOSE:To move an objective lens away from a disk with no collision caused between them when an out-focus servo state is caused. CONSTITUTION:When a focus servo lead-in operation fails or when a servo state is released in a focus servo operating mode and an objective lens moves out of a focus servo lead-in enable area, a focus servo lead-in signal 5 is set at a low level and therefore the focus servo is turned off. At the same time, a reset signal 1 is produced from a multivibrator 10 and the output of an objective lens shift signal generating circuit 14 is switched by an objective lens shift signal control circuit 11 into the direction where an objective lens is moved away from a disk. Then the signal 1 is applied to a focus coil driving amplifier 8 and an actuator 9 moves forcibly the objective lens away from the disk.

6. 发明专利

JPH05135372A OPTICAL HEAD 失效
公开(公告)号：JPH05135372A
公开(公告)日：1993-06-01
申请号：JP29684991
申请日：1991-11-13
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： MURAOKA KOJI , KIYOMATSU SATOSHI , GONDO HIROYUKI , SUENAGA KIYOYUKI , SAKATA SHINGO
IPC分类号： G11B7/085 , G11B7/135
摘要： PURPOSE:To provide a compact optical head by arranging a fixed optical system in the roughly surface area of an optical disk viewing from the normal direction of the surface of the optical disk by the optical head constituted of a separated optical system. CONSTITUTION:The fixed optical system 1 is arranged in the roughly surface area of the optical disk 8 of the opposing side of a moving optical system while holding a spindle motor 21 therebetween. At this time, a turning mirror 23 turning the optical axis 13 of a laser beam for passing a route evading the spindle motor 21, etc., is provided.

7. 发明专利

JPH0512682A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH0512682A
公开(公告)日：1993-01-22
申请号：JP16674391
申请日：1991-07-08
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SUENAGA KIYOYUKI , GONDO HIROYUKI , MURAOKA KOJI , SAKATA SHINGO
IPC分类号： G11B7/085
摘要： PURPOSE:To eliminate an elastic member, etc., and to stably perform focus servo pull-in by applying it to an actuator while widening successively the output pulse width of a pulse width variable oscillator at the time of the operation of the focus servo pull-in. CONSTITUTION:When power source is supplied, since a focus servo pull-in signal 28 is at a low level and a switch 30 is turned off, the focus servo is not operated. At this time, when a switch 22 is closed, the pulse of the pulse width variable oscillator 21 whose voltage interval is constant and only whose pulse width is changed gradually longer is inputted to a focus coil driving amplifier 23, a current flows through the actuator 24 and an objective lens is moved at a certain current. The focus servo pull-in signal 28 is generated by that the output signals of two focus error sensors 25 pass through a comparator 27 through an adder 26.

8. 发明专利

JPH04307432A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH04307432A
公开(公告)日：1992-10-29
申请号：JP7150691
申请日：1991-04-04
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SUENAGA KIYOYUKI , GONDO HIROYUKI , MURAOKA KOJI , SAKATA SHINGO
IPC分类号： G11B7/085 , G11B7/095
摘要： PURPOSE:To provide an actuator control system capable of stably and highly accurately conducting a tracking servo control in an optical disk device provided with the actuator supported by an elastic member, etc. CONSTITUTION:An offset signal generation circuit 15 applies several appropriate offset signals 13, an object lens is shifted to a proper position, a track address is read from the disk, and the respective offset signals 13 and a position signal 10 of the object lens obtained from the track address 8 are stored in a memory 14. At the time of recording and reproducing the signal, the offset value is read out of the memory 14 corresponding to the position of the object lens, and an offset signal 9 is applied from an offset signal generation circuit 13. Thus, the influence of an external force due to the elastic member, etc., can be eliminated and the stable and highly accurate tracking servo control can be realized.

9. 发明专利

JPH04278233A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH04278233A
公开(公告)日：1992-10-02
申请号：JP4206691
申请日：1991-03-07
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： MURAOKA KOJI , GONDO HIROYUKI , SUENAGA KIYOYUKI , SAKATA SHINGO
IPC分类号： G11B7/085 , G11B7/095 , G11B21/10
摘要： PURPOSE:To estimate a changing tracking error offset value and compensate the offset value. CONSTITUTION:A tracking error signal output from a tracking error signal generator 4 is corrected by a tracking error offset compensator 11, using a tracking error offset signal previously stored in a memory device 10. This corrected tracking error signal is assumed to be a true value of the tracking error so that an optical pick up 1 may be tracking-controlled.

10. 发明专利

JPH0495253A MAGNETO-OPTICAL DISK DEVICE 失效
公开(公告)号：JPH0495253A
公开(公告)日：1992-03-27
申请号：JP21283490
申请日：1990-08-10
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SUENAGA KIYOYUKI , GONDO HIROYUKI , MATSUBA HIROYUKI , TAROUMARU MAKOTO
IPC分类号： G11B11/10 , G11B7/095 , G11B11/105
摘要： PURPOSE:To reduce the total thickness of a magneto-optical disk device by using in common a permanent magnet for focus/tracking control of an objective lens and magnet for generation of the data recording/erasing external bias magnetic filed for the magneto-optical disk in a paired form and furthermore fixing these magnets independently of a carriage. CONSTITUTION:A carriage 9 movable in the radius direction of a magneto- optical disk 10 is provided together with an objective lens holder 2 which contains an objective lens 1, focus coil 4, a tracking coil 3, etc., and the magnets 5 nd 6 which are fixed independently of the carriage 9 so that the same magnetic poles are set counter to each other on a carriage shift path. Then the magnetic fields close to the same magnetic poles are used for the focus and tracking control purposes among those magnetic fields generated by both magnets 5 and 6. Meanwhile the optical axis direction component of the magnetic filed is used as a bias magnetic filed which decides the magnetic filed direction when the data are recorded and erased to the disk 10 at a position near the recording area of the disk 10. As a result, a thin and light-weight magneto-optical disk device is obtained.

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