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    OPTICAL DISC DRIVE
    32.
    发明专利
    OPTICAL DISC DRIVE 未知

    公开(公告)号：CA1326904C

    公开(公告)日：1994-02-08

    申请号：CA600905

    申请日：1989-05-29

    Applicant: SONY CORP

    Inventor： MAEDA YASUAKI ,  ANDO RYO ,  OBATA HIDEO

    IPC: G11B19/28 ,  G11B19/247 ,  G11B20/18 ,  G11B27/19 ,  G11B27/30 ,  G11B19/12

    Abstract: An optical disc drive is disclosed in which an optical disc on which pregrooves are fomred for affording wobble signals frequency modulated by predetermined data signals is driven at a constant linear velocity. Until the time that the data signals obtained upon demodulating the wobble signals are taken out correctly, the reproduced wobble signals are compared with a predetermined reference signal so that a spindle motor for rotating the optical disc is controlled so as to be driven at an approximately constant linear velocity. After it is detected that the data signals obtained upon demodulating the wobble signals are taken out correctly, the spindle motor is driven in a controlled manner on the basis of data signals obtained upon demodulating the reproduced wobble signals so that the spindle motor is controlled so as to be driven at a constant linear velocity. In this manner, the optical disc is controlled immediately at the start time of the optical disc or at the time of track jump by the optical head so that the optical disc is driven a constant linear velocity.

    APPARATUS FOR RECORDING AND/OR REPRODUCING AN OPTICAL DISC
    34.
    发明专利
    APPARATUS FOR RECORDING AND/OR REPRODUCING AN OPTICAL DISC 未知

    公开(公告)号：CA1310121C

    公开(公告)日：1992-11-10

    申请号：CA565496

    申请日：1988-04-29

    Applicant: SONY CORP

    Inventor： MAEDA YASUAKI

    IPC: G11B27/00 ,  G11B7/00 ,  G11B7/0045 ,  G11B7/007 ,  G11B7/013 ,  G11B7/30 ,  G11B11/105 ,  G11B19/02 ,  G11B27/034 ,  G11B27/036 ,  G11B27/10 ,  G11B27/11 ,  G11B27/32

    Abstract: An apparatus for recording and/or reproducing an optical disc having an optical disc having an optical recording medium which pertimts information signals to be recorded thereon and a recording region divided into a first recording region for recording information signals and a second recording region for recording information signals based on the information signals recorded in the first recording region, an optical pickup for recording information signals on the optical disc and reproducing information signals recorded on the optical disc and a controller for controlling the operation of the optical pickup so as to re-record the information signal written in the second recording region corresponding to the final recording terminating point after an information signal has been recorded or rewritten in the first recording region by the optical pickup.

    OPTICAL RECORDING MEDIUM AND DISC CARTRIDGE
    38.
    发明专利
    OPTICAL RECORDING MEDIUM AND DISC CARTRIDGE 未知

    公开(公告)号：CA2310706A1

    公开(公告)日：2000-12-22

    申请号：CA2310706

    申请日：2000-06-06

    Applicant: SONY CORP

    Inventor： AOKI YOSHITAKA ,  MAEDA YASUAKI ,  KAERIYAMA TAKUYA ,  NETSU NAOHIRO ,  WATANABE TETSU ,  FUJIIE KAZUHIKO

    IPC: G11B7/007 ,  G11B7/013 ,  G11B7/24 ,  G11B7/26 ,  G11B11/105 ,  G11B23/00 ,  G11B23/03 ,  G11B7/0037

    Abstract: An optical recording medium is provided which has a substrate and a signal recording layer provided on the substrate and in which an information signal is recorded in the form of microscopic pits. A light beam is focused on the signal recording layer and some change of the light beam carried by a return light from the signal recording layer is detected to read the information signal recorded on the signal recording layer. The optical recording medium has a diameter of 65 mm or less and a thickness of 0.4 to 0.7 mm. An information signal recording area extends outwardly from a radial position of 12.5 mm or less from the center of the medium. The ratio in area between the information signal recording area and non-signal recording area is 3.4 or more. The storage capacity of this medium is 2 gigabytes or more. The optical recording medium has formed at the center thereof a center hole around which an annular table-abutment convexing to one side of the medium is formed. A magnetic-clamping hub is installed in the center hole and thus the medium is magnetically clamped to a rotation driving mechanism of an optical recording and/or reproducing apparatus. The compactness and high density of recording of the optical recording medium will contribute greatly to a further compact structure of a recording and/or reproducing apparatus in which the medium is to be used.

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