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    21.
    发明专利
    未知

    公开(公告)号：DE69322601T2

    公开(公告)日：1999-05-06

    申请号：DE69322601

    申请日：1993-10-28

    Applicant: SONY CORP

    Inventor： FUJITA GORO ,  TOBITA MINORU

    IPC: G11B7/005 ,  G11B20/10 ,  G11B20/18

    Abstract: In an optical information recording or reproducing apparatus, an asymmetry detection circuit (16) detects asymmetry values from digital RF signals reproduced from the reference area of an optical disk (3) according to a timing signal generated by a timing signal generator (13). The digital RF signals are demodulated by the viterbi algorithm by a viterbi detection circuit (17) on the basis of asymmetry values detected by an asymmetry detection circuit (16).

    23.
    发明专利
    未知

    公开(公告)号：DE69833590D1

    公开(公告)日：2006-04-27

    申请号：DE69833590

    申请日：1998-06-18

    Applicant: SANYO ELECTRIC CO ,  SHARP KK ,  FUJITSU LTD ,  SONY CORP

    Inventor： TOBITA MINORU ,  MAEDA SHIGEMI ,  HIOKI TOSHIAKI ,  MATSUURA MICHIO

    IPC: G11B7/007 ,  G11B7/24 ,  G11B7/00 ,  G11B7/005 ,  G11B7/09 ,  G11B7/095 ,  G11B11/105 ,  G11B27/19 ,  G11B27/30

    Abstract: An optical disc and an optical disc drive for the optical disc are provided which are suitable for recording data with a high density. The optical disc D uses both lands and grooves as recording tracks. Each of the tracks consists of one address segment and forty five data segments. The address segment is wobbled at one side thereof. Each of the data segments is a DC groove. The address segment records an address information including a sync signal, frame address, track address and CRC, a tilt pattern and a clock mark. The clock mark is adapted to reflect laser beam in one amount before the mark and in another amount after the mark. The tilt pattern has a different track pitch from those in other areas. The data segments record data magneto-optically.

    25.
    发明专利
    未知

    公开(公告)号：DE69726695D1

    公开(公告)日：2004-01-22

    申请号：DE69726695

    申请日：1997-10-01

    Applicant: SONY CORP

    Inventor： HORIMAI HIDEYOSHI ,  TOBITA MINORU ,  FUJITA GORO ,  TOSAKA SUSUMU

    IPC: G11B7/0037 ,  G11B7/007 ,  G11B7/09 ,  G11B7/135 ,  G11B7/14 ,  G11B7/26 ,  G11B11/105 ,  G11B7/00

    Abstract: A format of a recording medium suitable for a larger capacity, a higher transfer rate, and integration of pits/lands/grooves is provided. In a first method, in a recordable and reproduceable area, a twin-track structure of lands/grooves is configured such that tracks on which lands become recording tracks and tracks on which grooves become recording tracks form a double spiral. In a read-only area, pits are arrayed such that tracks in the radial direction of the disk are formed in a data area. In a second method, in a recordable and reproduceable area, a land/groove-alternate track structure is configured such that grooves become data recording tracks in the circular track next to the circular track in which lands become data recording tracks, and lands become data recording tracks in the next circular track. In the read-only area, pits are arrayed such that tracks in the radial direction of the disk are formed in the data area.

    26.
    发明专利
    未知

    公开(公告)号：DE69531527D1

    公开(公告)日：2003-09-25

    申请号：DE69531527

    申请日：1995-09-12

    Applicant: SONY CORP

    Inventor： SAKO YOICHIRO ,  YAMAGAMI TAMOTSU ,  OTSUKA SATOSHI ,  TOBITA MINORU

    IPC: G11B7/007 ,  G11B20/12 ,  G11B20/18 ,  G11B27/19 ,  G11B27/30

    Abstract: Method of recording on a record medium (4) by receiving a series of data elements, adding error detection and error correction data to each data element, moving some of the data in each data element to an adjacent data element to produce arranged data elements, and recording the arranged data elements in different sectors on a record medium (4). Upon reproduction of the arranged data elements from a record medium (4), some of the data in each arranged data element are moved to an adjacent data element to produce rearranged data elements. Errors in each rearranged data element are detected and corrected using data contained therein. A record medium (4) having concentric tracks on which a plurality of sectors are located stores data in each of the sectors. The data in each sector pertains to two different sectors so that the affect of a burst error on a particular sector is minimized.

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