公开(公告)号：DE69525309T2

公开(公告)日：2002-09-19

申请号：DE69525309

申请日：1995-11-24

Applicant: SONY CORP

Inventor： SHIMIZUME KAZUTOSHI ,  AKITA MAMORU ,  NAKAMURA SHINOBU

IPC: G11B20/14 ,  G11B19/28 ,  G11B19/247

Abstract: A disc reproduction apparatus, configured so that a voltage-controlled oscillator (113) is used as a means of giving a reference frequency to an analog phase-locked loop circuit (110), a control voltage based on a speed error of the rotational speed of a spindle with respect to the reference speed is given to this voltage-controlled oscillator by a rotational speed measuring circuit (111), and a reference clock (PLLCKxL) is produced in the analog phase-locked loop circuit (110) based on the oscillation frequency output by this voltage-controlled oscillator (113) and, at the same time, the reproduction clock (PLLCK) is produced by a digital phase-locked loop circuit (120) based on this reference clock, whereby the operation becomes stable with respect to external disturbances of the rotation and high speed access is enabled.

公开(公告)号：DE69520649T2

公开(公告)日：2001-11-15

申请号：DE69520649

申请日：1995-11-24

Applicant: SONY CORP

Inventor： SHIMIZUME KAZUTOSHI ,  AKITA MAMORU

IPC: G11B20/14 ,  G11B7/085 ,  G11B7/095 ,  G11B7/14 ,  G11B19/20 ,  G11B19/247 ,  G11B19/28 ,  G11B20/10 ,  G11B21/00 ,  G11B21/08 ,  G11B25/04 ,  G11B27/10 ,  G11B27/30 ,  G11B7/00

Abstract: A plurality of pickups (3a, 3b) are provided for reading information recorded on a disc (1). Each of the pickups is provided with a signal processing system and a control system. Each of the signal processing systems and the control systems is controlled by a system controller (8) such that, while one pickup is reading the information, another pickup is moved to a next information reading position and put in a standby state. As soon as the former pickup has completed the reading operation, the latter pickup gets out of the standby state to be ready for reading the information at the above-mentioned next position. This novel set-up reduces seek time significantly.

公开(公告)号：EP0714097A3

公开(公告)日：1998-06-10

申请号：EP95402653

申请日：1995-11-24

Applicant: SONY CORP

Inventor： SHIMIZUME KAZUTOSHI ,  AKITA MAMORU ,  NAKAMURA SHINOBU

IPC: G11B20/14 ,  G11B19/28

CPC classification number: G11B19/28

Abstract: A disc reproduction apparatus, configured so that a voltage-controlled oscillator (113) is used as a means of giving a reference frequency to an analog phase-locked loop circuit (110), a control voltage based on a speed error of the rotational speed of a spindle with respect to the reference speed is given to this voltage-controlled oscillator by a rotational speed measuring circuit (111), and a reference clock (PLLCKxL) is produced in the analog phase-locked loop circuit (110) based on the oscillation frequency output by this voltage-controlled oscillator (113) and, at the same time, the reproduction clock (PLLCK) is produced by a digital phase-locked loop circuit (120) based on this reference clock, whereby the operation becomes stable with respect to external disturbances of the rotation and high speed access is enabled.

公开(公告)号：DE69726511T2

公开(公告)日：2004-09-30

申请号：DE69726511

申请日：1997-08-13

Applicant: SONY CORP

Inventor： SHIMIZUME KAZUTOSHI ,  AKITA MAMORU

IPC: G11B7/0037 ,  G11B19/26 ,  G11B19/28

Abstract: In a disk recording/reproduction apparatus, the operational limit of cach of a mechanical apparatus and signal proccssing scction of the disk drive is taken into consideration. When an area from the innermost rcgion of a disk to a predetermined radius is recorded or reproduced, the disk is rotationally, driven by a Constant Angular Velocity (CAV) mcthod, and whcn an area from the predetermined radius of the disk to the outermost region is recorded or reproduced, the disk is rotationally, drivcn by a Constant Linear Velocity (CLV) method.

公开(公告)号：DE69433100T2

公开(公告)日：2004-05-27

申请号：DE69433100

申请日：1994-10-07

Applicant: SONY CORP

Inventor： SHIMIZUME KAZUTOSHI ,  AKITA MAMORU

IPC: G11B7/085 ,  G11B7/09 ,  G11B19/00 ,  G11B19/02 ,  G11B19/04 ,  G11B19/20 ,  G11B19/26 ,  G11B19/28 ,  G11B20/10 ,  G11B27/00 ,  G11B27/30 ,  E04B5/38

Abstract: The frequency of an oscillation output of a VCO (88) is controlled in accordance with a servo error signal obtained from a spindle servo signal processor (18), and such oscillation output is supplied as a system clock signal to a DSP (10). Meanwhile, a phase comparator (92) detects the phase difference between an output of a 1/M frequency divider (91) relative to the oscillation output and an output of a 1/N frequency divider (93) relative to a reference clock signal, and the rotation speed of a disk (1) is controlled on the basis of the detected phase difference. A desired reproduction speed is settable by adequately selecting the respective frequency division ratios of the 14/M frequency divider (91) and the 1/N frequency divider (93), and a play mode is switched to, e.g., 2-fold speed reproduction upon occurrence of a track jump caused during a 1-fold speed play mode by any external disturbance such as shock.

公开(公告)号：DE69726511D1

公开(公告)日：2004-01-15

申请号：DE69726511

申请日：1997-08-13

Applicant: SONY CORP

Inventor： SHIMIZUME KAZUTOSHI ,  AKITA MAMORU

IPC: G11B7/0037 ,  G11B19/26 ,  G11B19/28

Abstract: In a disk recording/reproduction apparatus, the operational limit of cach of a mechanical apparatus and signal proccssing scction of the disk drive is taken into consideration. When an area from the innermost rcgion of a disk to a predetermined radius is recorded or reproduced, the disk is rotationally, driven by a Constant Angular Velocity (CAV) mcthod, and whcn an area from the predetermined radius of the disk to the outermost region is recorded or reproduced, the disk is rotationally, drivcn by a Constant Linear Velocity (CLV) method.

公开(公告)号：DE69424199D1

公开(公告)日：2000-06-08

申请号：DE69424199

申请日：1994-02-03

Applicant: SONY CORP

Inventor： SHIMIZUME KAZUTOSHI ,  AKITA MAMORU ,  INOHANA SHIGERU ,  NODA HIDENOBU

IPC: G11B7/095 ,  G11B7/09

Abstract: In a recording and reproducing apparatus of CD (21) or the like, it is adapted such that the quantity ofjitters in an RF signal is measured as a time difference between an edge of a PLL clock synchronized with an EFM signal and a transition point of the EFM signal in a time difference measuring circuit, a focus bias voltage to bring the time difference to a minimum is established in a bias voltage generator (27), the established focus bias voltage is added in an adder to a focus error signal generated in a focus error signal generator (23), and, thereby, the focus bias is automatically adjusted and focus servo is executed in accordance with the bias-adjusted focus error signal.

公开(公告)号：DE69432572T2

公开(公告)日：2004-04-08

申请号：DE69432572

申请日：1994-10-07

Applicant: SONY CORP

Inventor： SHIMIZUME KAZUTOSHI ,  AKITA MAMORU

IPC: G11B7/085 ,  G11B7/09 ,  G11B19/00 ,  G11B19/02 ,  G11B19/04 ,  G11B19/20 ,  G11B19/26 ,  G11B19/28 ,  G11B20/10 ,  G11B27/00 ,  G11B27/30

Abstract: The frequency of an oscillation output of a VCO (88) is controlled in accordance with a servo error signal obtained from a spindle servo signal processor (18), and such oscillation output is supplied as a system clock signal to a DSP (10). Meanwhile, a phase comparator (92) detects the phase difference between an output of a 1/M frequency divider (91) relative to the oscillation output and an output of a 1/N frequency divider (93) relative to a reference clock signal, and the rotation speed of a disk (1) is controlled on the basis of the detected phase difference. A desired reproduction speed is settable by adequately selecting the respective frequency division ratios of the 14/M frequency divider (91) and the 1/N frequency divider (93), and a play mode is switched to, e.g., 2-fold speed reproduction upon occurrence of a track jump caused during a 1-fold speed play mode by any external disturbance such as shock.

公开(公告)号：DE69432343T2

公开(公告)日：2004-03-04

申请号：DE69432343

申请日：1994-12-22

Applicant: SONY CORP

Inventor： NAKAMURA SHINORU ,  AKITA MAMORU

IPC: G11B7/09 ,  G11B20/10 ,  G11B20/14 ,  G11B27/30 ,  G11B19/00

Abstract: An optical disc player wherein an amount of jitter in a write clock (WRCK) as opposed to a read clock (RFCK) is detected by a jitter counter (28), the write clock (WRCK) is counted by a reference counter (29) for a predetermined number of frames, the jitter amount is added/subtracted to/from the count output by an adder/subtractor (30), an offset of a further predetermined number of frames is given to a result of the addition/subtraction to generate a subcode synchronizing signal (GRSCOR) completely synchronized with the read clock (RFCK). The subcode synchronizing signal (GRSCOR) is outputted through an output determining circuit (32) only when a reproduction subcode synchronizing signal (SCOR) is found matching by a match detector (33) with the count output of the reference counter (29) twice successively. The novel constitution can correctly perform sound linking even for software having successive fixed patterns and perform sound linking without error even if reproduction data at sound linking point is processed with previous-value hold or interpolation.

公开(公告)号：DE69431889T2

公开(公告)日：2003-08-28

申请号：DE69431889

申请日：1994-10-07

Applicant: SONY CORP

Inventor： SHIMIZUME KAZUTOSHI ,  AKITA MAMORU

IPC: G11B7/085 ,  G11B7/09 ,  G11B19/00 ,  G11B19/02 ,  G11B19/04 ,  G11B19/20 ,  G11B19/26 ,  G11B19/28 ,  G11B20/10 ,  G11B27/00 ,  G11B27/30

Abstract: The frequency of an oscillation output of a VCO (88) is controlled in accordance with a servo error signal obtained from a spindle servo signal processor (18), and such oscillation output is supplied as a system clock signal to a DSP (10). Meanwhile, a phase comparator (92) detects the phase difference between an output of a 1/M frequency divider (91) relative to the oscillation output and an output of a 1/N frequency divider (93) relative to a reference clock signal, and the rotation speed of a disk (1) is controlled on the basis of the detected phase difference. A desired reproduction speed is settable by adequately selecting the respective frequency division ratios of the 14/M frequency divider (91) and the 1/N frequency divider (93), and a play mode is switched to, e.g., 2-fold speed reproduction upon occurrence of a track jump caused during a 1-fold speed play mode by any external disturbance such as shock.