公开(公告)号：ID25700A

公开(公告)日：2000-11-02

申请号：ID20000351

申请日：2000-04-27

Applicant: SONY CORP

Inventor： KONDO MASAMICHI ,  MIKAMI TETSUO ,  NISHIDA NORIO

IPC: G11B7/126 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/0045 ,  G11B7/125 ,  G11B19/04

Abstract: There is provided a disk drive unit which is capable of making control corresponding to contaminant and defect by discriminating the contaminant (dust, scratch) on the disk surface from the defect on the recording plane. In a pull-in signal PI corresponding to reflected light from a disk, a defect detecting signal corresponding to a signal whose level change is relatively quick corresponding to the defect of the recording plane and a contaminant detecting signal which corresponds to a signal whose level change is relatively slow corresponding to the contaminant on the disk surface are generated. When the defect detecting signal is at low level for example, a system controller retries a recording operation or increases laser light when the contaminant detecting signal is at low level. A quantity of output light of a laser diode is controlled so that a product of output light of a laser diode and reflected light from the disk amounts to a predetermined level.

公开(公告)号：CA2288596A1

公开(公告)日：2000-05-09

申请号：CA2288596

申请日：1999-11-08

Applicant: SONY CORP

Inventor： MUNEKATA KAZUMI ,  OGAWA KENJI ,  TAKEDA TORU ,  KUMAI SATOSHI ,  UEHARA SYUJI ,  OKANISHI TOSHIHARU ,  MIKAMI TATSUO ,  SATO SHOJI ,  MINE NORICHIKA ,  NISHIDA NORIO ,  ISHIKAWA HIDEKI ,  YANAMOTO KAORU

IPC: G11B7/24 ,  G11B7/007 ,  G11B7/26 ,  G11B19/247 ,  G11B20/10 ,  G11B27/19 ,  G11B27/24 ,  G11B27/30 ,  G11B7/0037

Abstract: Disclosed herein are a disc recording medium, a recording apparatus and a playback apparatus, more concretely, the present invention provides a disc recording medium wherein a circular track is created in advance to be used for recording data as a groove or a land, 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.

公开(公告)号：DE68914611T2

公开(公告)日：1994-08-04

申请号：DE68914611

申请日：1989-12-07

Applicant: SONY CORP

Inventor： NISHIDA NORIO

IPC: G11B7/013 ,  G11B7/085 ,  G11B7/09 ,  G11B21/08

Abstract: Apparatus for detecting the speed with which a light beam emitted by an optical head accesses a target record track on an optical disc in which record track traverse data indicating track number are recorded previously. The traverse data is read and traverse data signals indicative of the scanning position of the light beam are produced. Deviations in the traverse data signals obtained at predetermined time intervals are detected to form upper order data bits representing access speed. At the same time, tracking error data signals proportionate to the deviation of the light beam from a record track on the disc are produced and a deviation in the tracking error data signals is detected to form the lower data bits of the access speed.

公开(公告)号：DE3784326T2

公开(公告)日：1993-07-29

申请号：DE3784326

申请日：1987-12-15

Applicant: SONY CORP

Inventor： EGUCHI NAOYA ,  NISHIDA NORIO

IPC: G11B7/085 ,  G11B7/09

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.

公开(公告)号：AT86043T

公开(公告)日：1993-03-15

申请号：AT87311056

申请日：1987-12-15

Applicant: SONY CORP

Inventor： EGUCHI NAOYA ,  NISHIDA NORIO

IPC: G11B7/085 ,  G11B7/09

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.

公开(公告)号：AU766600B2

公开(公告)日：2003-10-16

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.

公开(公告)号：DE69126372T2

公开(公告)日：1997-09-25

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.

公开(公告)号：DE68917720D1

公开(公告)日：1994-09-29

申请号：DE68917720

申请日：1989-04-18

Applicant: SONY CORP

Inventor： KOBAYASHI SEIJI ,  NISHIDA NORIO ,  EGUCHI NAOYA ,  YOSHIMURA SHUNJI

IPC: G11B21/08 ,  G11B7/007 ,  G11B7/085 ,  G11B21/10

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.

公开(公告)号：DE68914611D1

公开(公告)日：1994-05-19

申请号：DE68914611

申请日：1989-12-07

Applicant: SONY CORP

Inventor： NISHIDA NORIO

IPC: G11B7/013 ,  G11B7/085 ,  G11B7/09 ,  G11B21/08

Abstract: Apparatus for detecting the speed with which a light beam emitted by an optical head accesses a target record track on an optical disc in which record track traverse data indicating track number are recorded previously. The traverse data is read and traverse data signals indicative of the scanning position of the light beam are produced. Deviations in the traverse data signals obtained at predetermined time intervals are detected to form upper order data bits representing access speed. At the same time, tracking error data signals proportionate to the deviation of the light beam from a record track on the disc are produced and a deviation in the tracking error data signals is detected to form the lower data bits of the access speed.

公开(公告)号：FR2610130A1

公开(公告)日：1988-07-29

申请号：FR8800663

申请日：1988-01-21

Applicant: SONY CORP

Inventor： KOBAYASHI SEIJI ,  NISHIDA NORIO

IPC: G11B7/085 ,  G11B7/09 ,  G11B21/08 ,  G11B21/10

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.