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公开(公告)号：DE69126372D1
公开(公告)日：1997-07-10
申请号：DE69126372
申请日：1991-06-26
Applicant: SONY CORP
Inventor： NISHIDA NORIO , YAMASHITA YOSHIHIDE
IPC: G11B19/28
Abstract: Disk drive apparatus for reproducing information signal from a disk (1) on which the information signal and a servo sector pulse are recorded, which includes sampling circuit for sampling an output of a counter (9). A speed control signal is generated by detecting a difference between continuous sampling values, and a spindle motor (7) is controlled by the speed control signal. When the rotational speed is slow, the sampling is performed by a detection output for the spindle motor (7), and when the rotational speed is nearly equal to a normal speed, that is performed by the sector pulse.
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公开(公告)号：HK41891A
公开(公告)日：1991-06-07
申请号：HK41891
申请日：1991-05-30
Applicant: SONY CORP
Inventor： KOBAYASHI SEIJI , NISHIDA NORIO
Abstract: A tracking servo follows recording tracks formed in a recording medium. A signal proportional to a displacement from a recording track in a track pitch direction of the recording track is used as a displacement signal, so that following a given track or jumping to a new track position can be stably and easily performed.
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公开(公告)号：DE3801696A1
公开(公告)日：1988-08-04
申请号：DE3801696
申请日：1988-01-21
Applicant: SONY CORP
Inventor： KOBAYASHI SEIJI , NISHIDA NORIO
Abstract: A tracking servo follows recording tracks formed in a recording medium. A signal proportional to a displacement from a recording track in a track pitch direction of the recording track is used as a displacement signal, so that following a given track or jumping to a new track position can be stably and easily performed.
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公开(公告)号：AU5836199A
公开(公告)日：2000-05-11
申请号：AU5836199
申请日：1999-11-08
Applicant: SONY CORP
Inventor： TAKEDA TORU , KUMAI SATOSHI , MIKAMI TATSUO , UEHARA SYUJI , OKANISHI TOSHIHARU , OGAWA KENJI , NISHIDA NORIO , SATO SHOJI , ISHIKAWA HIDEKI , MUNEKATA KAZUMI , YANAMOTO KAORU , MINE NORICHIKA
IPC: G11B7/24 , G11B7/007 , G11B7/26 , G11B19/247 , G11B20/10 , G11B27/19 , G11B27/24 , G11B27/30 , G11B27/32 , G11B20/16
Abstract: Disclosed herein are a disc recording medium (1), a recording apparatus and a playback apparatus, more concretely, the present invention provides a disc recording medium (1) wherein a circular track is created in advance to be used for recording data as a groove (GV) or a land (L), said track is wobbled to contain approximately fixed number of wobbling periods as counted in a longitudinal direction of said track, and said track includes rotational-angle marks each showing a predetermined rotational angular position on said disc recording medium. As a result, the precision and the reliability of recording can be attained.
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公开(公告)号：AT110485T
公开(公告)日：1994-09-15
申请号：AT89904609
申请日：1989-04-18
Applicant: SONY CORP
Inventor： KOBAYASHI SEIJI , NISHIDA NORIO , EGUCHI NAOYA , YOSHIMURA SHUNJI
Abstract: The method of the present invention comprises detecting a recording pattern, which is different for each track, in each of track groups consisting of a predetermined number N of tracks recorded in advance on an optical disk (1), generating a tracking signal SET whose signal level changes on the positive and negative sides of a target track TO as the center, and moving the optical spot to the target track TO on the basis of this tracking signal SET. In this manner, it becomes possible to prevent uncontrollable movement of the optical spot and align the optical spot to a desired recording track within a short period of time.
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Patent Agency Ranking
公开(公告)号：ID25721A
公开(公告)日：2000-11-02
申请号：ID991033
申请日：1999-11-08
Applicant: SONY CORP
Inventor： TAKEDA TORU , KUMAI SATOSHI , MIKAMI TATSUO , UEHARA SYUJI , OKANISHI TOSHIHARU , OGAWA KENJI , NISHIDA NORIO , SATO SHOJI , SATO HIDEKI , ISHIKAWA HIDEKI , MUNEKATA KAZUMI , YANAMOTO KAORU , MINE NORICHIKA
Abstract: Disclosed herein are a disc recording medium (1), a recording apparatus and a playback apparatus, more concretely, the present invention provides a disc recording medium (1) wherein a circular track is created in advance to be used for recording data as a groove (GV) or a land (L), said track is wobbled to contain approximately fixed number of wobbling periods as counted in a longitudinal direction of said track, and said track includes rotational-angle marks each showing a predetermined rotational angular position on said disc recording medium. As a result, the precision and the reliability of recording can be attained.
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公开(公告)号：DE3801696C2
公开(公告)日：1996-12-05
申请号：DE3801696
申请日：1988-01-21
Applicant: SONY CORP
Inventor： KOBAYASHI SEIJI , NISHIDA NORIO
Abstract: A tracking servo follows recording tracks formed in a recording medium. A signal proportional to a displacement from a recording track in a track pitch direction of the recording track is used as a displacement signal, so that following a given track or jumping to a new track position can be stably and easily performed.
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公开(公告)号：DE68917720T2
公开(公告)日：1995-01-12
申请号：DE68917720
申请日：1989-04-18
Applicant: SONY CORP
Inventor： KOBAYASHI SEIJI , NISHIDA NORIO , EGUCHI NAOYA , YOSHIMURA SHUNJI
Abstract: The method of the present invention comprises detecting a recording pattern, which is different for each track, in each of track groups consisting of a predetermined number N of tracks recorded in advance on an optical disk (1), generating a tracking signal SET whose signal level changes on the positive and negative sides of a target track TO as the center, and moving the optical spot to the target track TO on the basis of this tracking signal SET. In this manner, it becomes possible to prevent uncontrollable movement of the optical spot and align the optical spot to a desired recording track within a short period of time.
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公开(公告)号：DE3784326D1
公开(公告)日：1993-04-01
申请号：DE3784326
申请日：1987-12-15
Applicant: SONY CORP
Inventor： EGUCHI NAOYA , NISHIDA NORIO
Abstract: A track servo system in a recordable optical disc player utilizes clock signals produced by irradiating a laser beam (P) on clock pits (3) in servo areas as a reference signal for on-track adjustment. Based on the clock signal, the polarity of a tracking error signal is detected (20) for selectively opening and closing a servo loop (50) of the tracking servo system. CLOSED LOOP on-track adjustment is performed while a laser beam spot is in a range where the tracking error indicating value decreases as the distance of the laser beam spot from the track centre decreases. On the other hand, OPEN LOOP on-track adjustment is performed while the laser beam spot is in a range where the tracking error indicating value increases as Since the polarity of the tracking error signal indicates the range of the laser beam spot position, selection of the CLOSED LOOP and OPEN LOOP can be made without requiring the signal to be reproduced from the data area.
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公开(公告)号：GB2200227B
公开(公告)日：1991-01-16
申请号：GB8801083
申请日：1988-01-19
Applicant: SONY CORP
Inventor： KOBAYASHI SEIJI , NISHIDA NORIO
Abstract: A tracking servo follows recording tracks formed in a recording medium. A signal proportional to a displacement from a recording track in a track pitch direction of the recording track is used as a displacement signal, so that following a given track or jumping to a new track position can be stably and easily performed.
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