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    3.
    发明专利
    未知

    公开(公告)号：DE60134518D1

    公开(公告)日：2008-08-07

    申请号：DE60134518

    申请日：2001-09-24

    Applicant: SONY CORP

    Inventor： NAGASHIMA KENJI ,  KUMAGAI EIJI ,  KUMAI SATOSHI ,  MORIZUMI TOSHIO

    IPC: G11B7/125 ,  G11B7/0045 ,  G11B7/126

    Abstract: After the initiation of writing, an output signal from an LPF is sampled in correspondence with a portion with a predetermined pulse width of recording data, so as to obtain a pit level. In the resultant signal, its varying portions which correspond to the multi-pulse trains of the write signal are smoothed. A controller modifies a level of a target level signal to be supplied to an APC circuit in such a manner that the pit level becomes an optimum pit level which has been obtained prior to the initiation of writing.

    5.
    发明专利
    未知

    公开(公告)号：DE60015899D1

    公开(公告)日：2004-12-23

    申请号：DE60015899

    申请日：2000-09-20

    Applicant: SONY CORP

    Inventor： TAKEDA TORU ,  KUMAI SATOSHI ,  KONISHI AYUMI ,  SUZUKI JUNICHI

    IPC: G11B7/09 ,  G11B7/0045 ,  G11B7/007 ,  G11B7/12 ,  G11B27/19 ,  G11B27/30 ,  G11B7/00 ,  A61M1/00 ,  H01M2/16

    Abstract: There are provided a spindle motor 12, an optical head 20, a high-pass filter 31, low-pass filters 32 and 33, an adder 38, and a PLL 39. The spindle motor 12 rotatively drives an optical disk 11. The optical head 20 irradiates a laser beam onto a target track and both tracks adjacent to the target track on the optical disk 11 and detects a return light from each track. The high-pass filter 31 filters a high-frequency component in a signal used for detecting a return light from a target track in the optical head 20. Each of the low-pass filters 32 and 33 filters a low-frequency component in a signal used for detecting a return light from each of the adjacent tracks. The adder 38 operates output signals from the high-pass filter 31, and the low-pass filters 32 and 33. Based on a signal from the adder 38, the PLL 39 generates a reference signal used as a time reference for generating recording signals. An operation by the adder 38 nullifies a cross modulation component.

    8.
    发明专利
    未知

    公开(公告)号：DE60015899T2

    公开(公告)日：2006-03-02

    申请号：DE60015899

    申请日：2000-09-20

    Applicant: SONY CORP

    Inventor： TAKEDA TORU ,  KUMAI SATOSHI ,  KONISHI AYUMI ,  SUZUKI JUNICHI

    IPC: G11B7/09 ,  A61M1/00 ,  G11B7/00 ,  G11B7/0045 ,  G11B7/007 ,  G11B7/12 ,  G11B27/19 ,  G11B27/30 ,  H01M2/16

    Abstract: There are provided a spindle motor 12, an optical head 20, a high-pass filter 31, low-pass filters 32 and 33, an adder 38, and a PLL 39. The spindle motor 12 rotatively drives an optical disk 11. The optical head 20 irradiates a laser beam onto a target track and both tracks adjacent to the target track on the optical disk 11 and detects a return light from each track. The high-pass filter 31 filters a high-frequency component in a signal used for detecting a return light from a target track in the optical head 20. Each of the low-pass filters 32 and 33 filters a low-frequency component in a signal used for detecting a return light from each of the adjacent tracks. The adder 38 operates output signals from the high-pass filter 31, and the low-pass filters 32 and 33. Based on a signal from the adder 38, the PLL 39 generates a reference signal used as a time reference for generating recording signals. An operation by the adder 38 nullifies a cross modulation component.

    DATA RECORDER AND METHOD FOR RECORDING DATA ! MAGNETIC DISK UNIT
    10.
    发明专利
    DATA RECORDER AND METHOD FOR RECORDING DATA ! MAGNETIC DISK UNIT 失效

    公开(公告)号：JP2002117627A

    公开(公告)日：2002-04-19

    申请号：JP2000306573

    申请日：2000-10-05

    Applicant: SONY CORP

    Inventor： HORIBATA YOSHIHIRO ,  MITSUNE NORICHIKA ,  KUMAI SATOSHI ,  KAWAMURA TETSUSHI ,  OEDA TAKASHI ,  HIROSE TSUNEO ,  KUBO MITSURU ,  KARASAWA NORIYUKI ,  TAKADA YUKITO

    IPC: G11B20/12 ,  G11B7/0045 ,  G11B7/007 ,  G11B7/09 ,  G11B20/10 ,  G11B20/14 ,  G11B20/18

    Abstract: PROBLEM TO BE SOLVED: To avoid nonconformities where a tracking servo deviates in a prescribed block area, when an optical disk is played back by a ROM drive or the like in the case that shift processing is applied to the prescribed block area of the optical disk, by preventing the prescribed block area from turning into an unrecorded portion. SOLUTION: When a normal write clock is no longer generated correctly during writing data in a block area A, writing of data is stopped (Fig. 11 (a)) and shift processing is applied to this block area. Then, data are written in the block area A by using a reference clock based on a signalling frequency from a quartz oscillator. Data are recorded so as to span the next block area A+1 (Fig. 11 (b)), thereby the area following the block area A is prevented from constituting the unrecorded portion caused by the irregular rotation of the optical disk or the like. Data are recorded on the block area A+1 (Fig. 11 (c)) by using a usual write clock. The shift processing is applied also to the block area A+1.

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