公开(公告)号：JP2002124040A

公开(公告)日：2002-04-26

申请号：JP2000315459

申请日：2000-10-16

Applicant: SONY CORP

Inventor： HASEGAWA HIROYUKI ,  IIDA MICHIHIKO ,  KAWASHIMA TETSUJI

IPC: G11B20/12 ,  G11B7/004 ,  G11B19/12 ,  G11B20/10

Abstract: PROBLEM TO BE SOLVED: To easily discriminate whether an optical disk has an increased recording capacity or not. SOLUTION: An optical disk 10 is rotated at a desired speed and at a desired position, and a signal recorded on the optical disk is read. When a CRC recorded on a read-in area or a program area on which data can be recorded is reproduced, reproduction is performed by using a CRC error detection polynomial expression based on a difference of unit delay amount during interleave processing. A difference in recording density is discriminated by the reproduction output. A de-interleave processing system selected by a short unit delay amount is selected in the case of an optical disk for normal density, and a de-interleave processing system selected by a long unit delay amount is selected in the case of a high-density optical disk. Thereby, suitable data processing can be realized according to the difference in recording density.

公开(公告)号：JP2001291331A

公开(公告)日：2001-10-19

申请号：JP2000101352

申请日：2000-03-31

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI ,  SHISHIDO YUKIO ,  TSUKADA HIROSHI

IPC: G11B20/12 ,  G11B7/007 ,  G11B20/18

Abstract: PROBLEM TO BE SOLVED: To make a capacity larger and efficiently recording and reproducing operation possible. SOLUTION: A PCA 11, PMA 12, lead-in area 13, plural logic tracks 14a, 14b and 14c and lead-out area are set as recording regions of CD-R. Pregaps 17 are set at the top positions of program regions 16 in the respective logic tracks 14. The pregaps 17 are formed at prescribed frame lengths without depending on the data structure of the other logic tracks.

公开(公告)号：JP2001216650A

公开(公告)日：2001-08-10

申请号：JP2000024790

申请日：2000-01-28

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI

IPC: G11B7/0045 ,  G11B7/26

Abstract: PROBLEM TO BE SOLVED: To easily read control information. SOLUTION: Relating to a cutting device for manufacturing a master disk for duplicating an optical disk where a pre-groove for recording a signal is formed, when light emitted from an He-Cd laser 11 has intensity modulated by an optical modulator 12 in accordance with input data spectrum-spread by an encoder 50 and converged at a photoresist formed on the surface of a glass master disk 101 to form a latent image for the pre-groove, spectrum- spread control information is recorded by wobbling along the pre-groove.

公开(公告)号：JP2001209944A

公开(公告)日：2001-08-03

申请号：JP2000016091

申请日：2000-01-25

Applicant: SONY CORP

Inventor： IIDA MICHIHIKO ,  KAWASHIMA TETSUJI ,  UDAGAWA OSAMU ,  TSUKATANI SHIGEKI ,  TAMURA HARUYUKI

IPC: G11B7/0055

Abstract: PROBLEM TO BE SOLVED: To provide a method for erasing data of an optical disk which is capable of surely erasing the recording data of the optical disk which allows just one time of writing of data. SOLUTION: The desired data recording region of the optical disk which allows just one time of writing of data is irradiated with a laser beam of power exceeding the power in reproducing, by which the recording data of the desired data recording region is erased.

公开(公告)号：JP2000207851A

公开(公告)日：2000-07-28

申请号：JP794499

申请日：1999-01-14

Applicant: SONY CORP

Inventor： SHISHIDO YUKIO ,  KAWASHIMA TETSUJI ,  MIYAKE KUNIHIKO

IPC: G11B20/18

Abstract: PROBLEM TO BE SOLVED: To improve the success rate of reading out data and increase the read-out speed by contriving the retry operation. SOLUTION: When all data forming one group cannot be buffered appropriately and the leading data of the group (e.g. start header) are buffered, this reproducing device performs first retry operation (buffering retry) which is not accompanied by access to a read-out position (F179), on the other hand, when the leading data of the group is not buffered, the device performs second retry operation (access retry) which is accompanied by access to a read-out position (F180).

公开(公告)号：JPH11238297A

公开(公告)日：1999-08-31

申请号：JP4045598

申请日：1998-02-23

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI

IPC: G11B19/12

Abstract: PROBLEM TO BE SOLVED: To propose an optical record medium discriminating method and its device capable of speedily and surely discriminating an optical device. SOLUTION: This optical record medium discriminating device for discriminating the difference of the optical disk 1 of the different format of synchronizing signal at the tiem of reproducing an information signal from an optical pickup 3 with respect to the disk 1 is provided with a spindle motor 2 and a frequency measuring device 6 detecting a clock signal for locking the phase of the information signal reproduced by the pickup 3 at a prescribed position on the disk 1 to discriminate the difference of the optical disk 1 (CD/DVD) of the different format of the synchronizing signal from the difference of the longest pattern of the binary signal of the reproduced information signal. Thereby, during the frequency pull-in operation of PLL for regenerating a clock, the operation of disk discrimination can be executed to realize fast discrimination.

公开(公告)号：JPH10241302A

公开(公告)日：1998-09-11

申请号：JP4667197

申请日：1997-02-28

Applicant: SONY CORP

Inventor： IIDA MICHIHIKO ,  KAWASHIMA TETSUJI ,  SATO MASASHI ,  MASUDA SHOZO

IPC: G11B7/00 ,  G11B7/005 ,  G11B7/007 ,  G11B20/14 ,  G11B27/30

Abstract: PROBLEM TO BE SOLVED: To provide a disk device capable of reproducing recorded data correctly even though an area where the reliability of data is low is generated at a specific position being on a disk where a synchronizing signal is to be recorded. SOLUTION: The comparison error signal between the reproduced RF signal read out from a disk 100 and a channel clock signal PLCK is inputted from a phase/frequency comparing part 12 to a voltage controlled oscillator(VCO) 15, which generates a PLCK with a frequency in accordance with the voltage of the comparison error signal. In a data detecting part 16, data are taken out from the reproduced RF signal. When a sync pattern is detected from the data correctly in a sync pattern detecting and interpolating part 17, the comparison error signal is inputted to the VCO 15 as it is and when it is not detected correctly, a sample-and-hold part 14 holds the voltage of the comparison error signal by a control signal from a control part 20. At this time, the sync pattern interpolating operation of the sync pattern detecting and interpolating part 17 is suspended.

公开(公告)号：JPH09219028A

公开(公告)日：1997-08-19

申请号：JP2646796

申请日：1996-02-14

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI

IPC: G11B7/085

Abstract: PROBLEM TO BE SOLVED: To reduce the seek time of the optical disk having plural information layers. SOLUTION: When a seek, which includes the movement between information layers of an optical disk 1, is conducted, a system controller 6 first executes the movement among the layers by a focus actuator 11 or the coarse seek by a thread servo motor 8. Then, a fine seek is conducted by a tracking actuator 12 and completes the seek.

公开(公告)号：JPH0916264A

公开(公告)日：1997-01-17

申请号：JP16667995

申请日：1995-06-30

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI ,  SATO MASASHI ,  YOSHIKAWA KAZUYUKI

IPC: G11B21/08 ,  G05B11/36 ,  G05D3/12 ,  H02P29/00 ,  H02P5/00

Abstract: PURPOSE: To speed up seek operation when the motor controller is applied to an optical disk drive device. CONSTITUTION: The motor controller is constituted by providing a storage means 21 stored with a 1st data table constituted by arraying reference movement quantities θ(t) for acceleration of every time, an arithmetic means 23 which is activated at the time of the switching of a driving signal to a DC motor 1 and corrects a reference movement quantity θ(t) read out of the storage means 21 to convert it into a reference movement quantity θ'(t) for deceleration, and a control part 25 which outputs the reference movement quantity θ(t) for acceleration from the storage means 21 to a feedback control system 2 before the switching time of the driving signal to the DC motor 1 is elapsed and outputs the reference movement quantity θ'(t) from the arithmetic means 23 to the feedback control system 2 after the switching time is elapsed; and the respective reference movement quantities in the 1st data table stored in the storage means 21 are defined with a function based upon the function of a transient area of time variation in the angular speed of the DC motor 1.

公开(公告)号：JPH07254221A

公开(公告)日：1995-10-03

申请号：JP4421494

申请日：1994-03-15

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI

IPC: G11B20/10 ,  G11B19/02

Abstract: PURPOSE:To minimize the number of repositioning times or tape in a data streamer, wherein data-compressing technology without loss is adopted. CONSTITUTION:The data supplied from a host computer 2 are compressed with a compressing engine 12, which is operated by compressing technology without loss. Thereafter, the data are stored in a data buffer 4. The compressed data from the data buffer 4 are recorded on tape 8, which is passed on F. When the compressed data stored in the data buffer 4 run out during the recording into the tape 8, the tape is rewound for repositioning R. After the data are stored in the data buffer 4 again, the tape 8 is sent in the forward direction again, and the compressed data are recorded from the data buffer 4. The data compressing rate is estimated by a CPU 15, and the repositioning is controlled based on the estimated data compressing rate.