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11. 发明专利

JPH09213018A EVALUATION DEVICE 失效
公开(公告)号：JPH09213018A
公开(公告)日：1997-08-15
申请号：JP3560896
申请日：1996-01-30
申请人： VICTOR COMPANY OF JAPAN
发明人： OSADA YUTAKA , YANAGISAWA OSAMU , NAKANO EIJI
IPC分类号： G11B20/14 , G11B7/00 , G11B7/005 , G11B20/18
摘要： PROBLEM TO BE SOLVED: To effectively and accurately measure 'data to clock jitter' by obtaning a channel clock by simulation based on a measured time data array. SOLUTION: A time data Td obtained by continuously measuring reversing time intervals in a reproduced signal (a) is outputted by a measuring means 7. The channel clock (b') is generated and outputted by software simulation in a PLL simulation circuit 16 based on this time data Td. Then, a variation ('data to clock jitter') of a time base fluctuation data in accordance with a time base fluctuation between the time data Td and the channel clock (b') is obtained by a fluctuation data measuring means 17.

12. 发明专利

JPH05334696A 失效
公开(公告)号：JPH05334696A
公开(公告)日：1993-12-17
申请号：JP16378092
申请日：1992-05-29
申请人： VICTOR COMPANY OF JAPAN
发明人： OSADA YUTAKA
IPC分类号： G11B7/085 , G11B7/095
摘要： PURPOSE:To provide an access controller by which transfer from seek to tracking control can be stably performed even when external shock, etc., is applied, and the access time of an optical disk device can be shortened. CONSTITUTION:The access controller of the optical disk device using an optical disk 10 provided with a circular shape track for information recording is equipped with a lens position sensor 6 which detects the position of the objective lens 3L of an optical pickup 2, and a lens vibration suppression circuit 7B controlled corresponding to the output of the lens position sensor 6 and which suppresses the vibration of the objective lens 3L. The output of the lens vibration suppression circuit 7B is supplied to a tracking driving circuit 5 which controls a tracking actuator 3 for a prescribed time just before and immediately after the transfer from the seek to the tracking control is performed.

13. 发明专利

JPH05151584A ACCESS CONTROL DEVICE 失效
公开(公告)号：JPH05151584A
公开(公告)日：1993-06-18
申请号：JP34001791
申请日：1991-11-29
申请人： VICTOR COMPANY OF JAPAN
发明人： OSADA YUTAKA
IPC分类号： G11B7/085 , G11B7/095 , G11B21/10
摘要： PURPOSE:To enhance the stability of tracking settlement at the time of commencing tracking control and to shorten the access time without using a brake on a disk with no RF signal having a phase difference of 90 degrees from a track error signal. CONSTITUTION:The access control device of a disk device is so constituted that a tracking actuator 3 is controlled in accordance with a difference between an output V2 of a relative speed detecting circuit 1 for detecting relative speed of a recording and reproducing head 2 to a track at the time of a shift to a tracking control and an output V1 of a reference speed signal generating means (MPU), so as to make the relative speed approximately zero, and afterward, the normal tracking control is performed.

14. 发明专利

JPH0210670B2 失效
公开(公告)号：JPH0210670B2
公开(公告)日：1990-03-09
申请号：JP19642984
申请日：1984-09-19
申请人： VICTOR COMPANY OF JAPAN
发明人： OSADA YUTAKA , SAKAKIBARA SUSUMU , NOMURA HIDEO
IPC分类号： H02P29/00 , G05D3/12 , G11B5/55 , G11B19/28

15. 发明专利

JPH01236484A POSITION CONTROL SYSTEM FOR RECORDING AND REPRODUCING ELEMENT 失效
公开(公告)号：JPH01236484A
公开(公告)日：1989-09-21
申请号：JP6429588
申请日：1988-03-17
申请人： VICTOR COMPANY OF JAPAN
发明人： OSADA YUTAKA , KANEKO KEIICHI
IPC分类号： G11B21/10 , G11B21/08
摘要： PURPOSE:To minimize overshooting at the time of settling and to shorten the settling time by starting the operation of a filter with the data of the condition of the internal part of a filter in a storing means as the initial value of the filter after switching is executed to a position control means. CONSTITUTION:A switch SW in a digital signal processor DSP is made into an ON condition immediately switching is executed from a seek mode to a position control action mode and the reference speed is corrected only for the speed of a track runout. By outputting a feed forward signal from a ram table in a fine time from immediately after an action mode is switched to a position control mode, the overshooting at the time of settling is minimized without receiving the influence of the track runout. Further, after the fine time, the calculation of a band amplifying filter BAF is started with the data in the ram table as the initial value of the band amplifying filter BAF. Thus, the time until the stationary condition of the band amplifying filter BAF, namely, the stationary condition of a position control is obtained is shortened.

16. 发明专利

JPS6449181A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS6449181A
公开(公告)日：1989-02-23
申请号：JP20601187
申请日：1987-08-19
申请人： VICTOR COMPANY OF JAPAN
发明人： MIYAZAKI TAKESHI , OSADA YUTAKA
IPC分类号： G11B21/10
摘要： PURPOSE:To make data tracks high density without using a complex circuit by detecting a servo pattern recorded on a magnetic disk by a means other than a magnetic recording means and executing accurate tracking servo. CONSTITUTION:The magnetic disk 1 has the servo pattern (SP) for tracking servo concentrically or spirally formed by a means other than a magnetic recording means and two collating burst signals V1, V2 magnetically recorded in an area other than a data area A0 so as to be shifted from each other in the diameter direction on the basis of the SP. A magnetic head 4 for recording/ reproducing a data signal is provided with a sensor 2 for detecting the SP at a position separated by a prescribed distance, and when the SP is out from the detecting range, on-track is immediately executed by a tracking control circuit 4 for comparing the levels of the signals V1, V2 and detecting and collating the quantity of off-track, a head actuator driving circuit 11 and a head actuator 8. Thereby, the interval between tracks can be shortened and high density can be attained.

17. 发明专利

JPS61242381A REVOLVING SPEED CONTROLLER FOR SPINDLE MOTOR 失效
公开(公告)号：JPS61242381A
公开(公告)日：1986-10-28
申请号：JP8221285
申请日：1985-04-19
申请人： VICTOR COMPANY OF JAPAN
发明人： NOMURA HIDEO , OSADA YUTAKA
IPC分类号： H02P29/00 , G05D3/12 , G11B19/28 , G11B21/08 , G11B21/10
摘要： PURPOSE:To perform the control of revolution of a spindle motor with extremely high accuracy by giving linear drive continuously or intermittently to the information recording/reproduction signals in the radius direction of a disk at a prescribed position in response to the number of tracks between a track at the present position and a track at the target position of an information recording/reproduction element. CONSTITUTION:An access motor driver contains a speed control means 20 which skips at a high speed a magnetic head device 11 serving as an information recording/ reproduction element up to a track at the target position from a track at the present position, a position control means 21 which secures the accurate coincidence between the center position of the device 11 set on the track at the target position by the means 20 and the center position the track at the target position, and a revolution control means 19 which receives supply of the speed and position control signals S1 and S2 delivered from the means 20 and 21 respectively and drives with control a rotary shaft 13 of a spindle motor 12 in a prescribed direction and at a prescribed speed. Thus the shaft 13 can be revolved accurately and at a high speed for each minute angle. This attains a revolving speed controller for spindle motor which is effectively applied to a motor driver, etc.

18. 发明专利

JP2002352442A OPTICAL DISK, OPTICAL DISK-RECORDING METHOD AND OPTICAL DISK DEVICE 失效
公开(公告)号：JP2002352442A
公开(公告)日：2002-12-06
申请号：JP2001153938
申请日：2001-05-23
申请人： VICTOR COMPANY OF JAPAN
发明人： OSADA YUTAKA
IPC分类号： G11B7/24 , G11B7/0045 , G11B7/007
摘要： PROBLEM TO BE SOLVED: To surely set up the starting position for recording on the grooves of an optical disk. SOLUTION: In the optical disk presented by this invention, a track is formed by pairing wobbled grooves 3 with a land 5 located between the adjacent grooves, and address information for having access to the data to be recorded to the grooves and the like are preliminarily formed as a land prepit 5 on the land. Further, on the grooves 3, the combination of a front area 3a having the first data size and a data area 3b having second data size located behind the front area 3a is repeatedly arranged, the land prepits formed on the land are arranged at a prescribed interval for every combination in correspondence with the front area and the data area, and a front land prepit-detecting window area 3a2 for reading only the front land prepit 5a located in the front in correspondence with the front area by means of a laser power of fixed value without modulation when the data are recorded is arranged in the front area 3.

19. 发明专利

JP2002298446A OPTICAL DISK 失效
公开(公告)号：JP2002298446A
公开(公告)日：2002-10-11
申请号：JP2001102250
申请日：2001-03-30
申请人： VICTOR COMPANY OF JAPAN
发明人： OSADA YUTAKA
IPC分类号： G11B7/24 , G11B7/007 , G11B20/12
摘要： PROBLEM TO BE SOLVED: To reliably detect an address recorded on an optical disk by effectively utilizing an information recording surface even in recording data with higher density than before, and to carry out recording and playback resistant and stable to an external impact. SOLUTION: A user data recording area and an address data recording area are alternately formed in a disk circumferential direction. The address data are formed in a pit row on the recording area of address data in the form where a form of wobbling is continued to a groove track or a land track. Thereby, the address recorded on the optical disk can reliably be detected by effectively utilizing the information recording surface in recording data with higher density than before.

20. 发明专利

JP2002133758A RECORD REPRODUCING DEVICE 失效
公开(公告)号：JP2002133758A
公开(公告)日：2002-05-10
申请号：JP2000320480
申请日：2000-10-20
申请人： VICTOR COMPANY OF JAPAN , MATSUSHITA ELECTRIC IND CO LTD
发明人： UEKI YASUHIRO , OSADA YUTAKA , YANAGISAWA OSAMU , IGUCHI MUTSUMI , KAMIOKA YUICHI , KONNO KOUJIYU
IPC分类号： G11B20/10 , G11B7/005 , G11B7/007 , G11B19/28 , G11B20/14 , G11B27/19 , G11B27/24 , G11B27/30 , G11B19/247
摘要： PROBLEM TO BE SOLVED: To detect a wobbling signal with high precision even when a noise component is superimposed on the wobbling signal in a record reproducing device. SOLUTION: The prerecording information signal SPPX amplified by an X-time amplifier 33 is applied to a limiter 101 by a wobbling signal extracting section 22, and the noise component of a prepit signal is removed based on an upper level limit signal SUL and a lower level limit signal SWL from a limit level generator 102. The signal SPPX is made to pass an LPF(low pass filter) 104, the SL signal passing the LPF is made to pass an HPF(high pass filter) 105, and the SB signal passing the HPF is binarized by a binarizing unit 107 and fed to a servo circuit 15 after the wobbling extraction signal SDTT is extracted from it. The SL signal passing the LPF or the SB signal passing the HPF is selected and adjusted in phase by a phase adjuster 102a, and the limit level signals SWL and SUL are generated by the limit level generator based on the signal SSW adjusted in phase.

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