公开(公告)号：JP2001250249A

公开(公告)日：2001-09-14

申请号：JP2000063353

申请日：2000-03-03

Applicant: SONY CORP

Inventor： MIYAKE KUNIHIKO ,  HASEGAWA HIROYUKI ,  KAWASHIMA TETSUJI

IPC: G11B7/005 ,  G11B7/09

Abstract: PROBLEM TO BE SOLVED: To realize the stable tracking servo control in a linking part. SOLUTION: At the time of normal reproduction, a switch 30a is connected to the side of a terminal A to bypass a tracking drive signal TDR, and when the retry is carried out in the linking part, the switch 30a is changed over to the side of a terminal B so that the tracking drive signal TDR is outputted while keeping the low band component by a low-pass filter part (resistor R, capacitor C). The switch 30a is controlled based on e.g. a linking part detection signal L and a retry performance signal RT which are supplied from a system controller 10.

公开(公告)号：JP2001167563A

公开(公告)日：2001-06-22

申请号：JP2000299131

申请日：2000-09-29

Applicant: SONY CORP

Inventor： SAKO YOICHIRO ,  KAWASHIMA TETSUJI ,  SHISHIDO YUKIO ,  TSUKATANI SHIGEKI ,  TOYAMA KATSUMI ,  INOGUCHI TATSUYA

IPC: G11B20/12 ,  G11B7/004 ,  G11B7/007 ,  G11B27/10

Abstract: PROBLEM TO BE SOLVED: To provide a data recording medium which has time information of an existing recording medium as well as an address expressed in a binary number and is adaptive to high capacity. SOLUTION: The time information that is expressed in a BCD as a Q channel of a subcode is recorded in an existing CD-ROM and also recorded in a header included in data (Fig. 10A). To that end, a 24-bit address expression part is used. An address expressed in a binary number is recorded at the address expression part included in the header in place of the time information on the BCD (Fig. 10B). Thus, a larger number of addresses can be expressed in comparison with the BCD address expression so as to cope with increase of the disk capacity. In addition, the time of an existing player, etc., can be displayed since the time information is recorded as a subcode.

公开(公告)号：JP2001167562A

公开(公告)日：2001-06-22

申请号：JP2000299130

申请日：2000-09-29

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI ,  TOYAMA KATSUMI ,  SAKO YOICHIRO ,  INOGUCHI TATSUYA ,  TSUKATANI SHIGEKI ,  SHISHIDO YUKIO

IPC: G11B20/12 ,  G11B7/004 ,  G11B7/007 ,  G11B7/09 ,  G11B7/30 ,  G11B27/10 ,  G11B27/19 ,  G11B27/24 ,  G11B27/30

Abstract: PROBLEM TO BE SOLVED: To cope with high capacity by performing the binary expression of an address. SOLUTION: A wobbling groove is previously formed on an optical disk and an address is recorded as the wobble information on the wobbling groove. In regard to an existing optical disk, the address of a minute/second frame is expressed in a BCD (Fig. 4A). To that end, a 24-bit address expression part is used, and an address of binary expression is recorded at the address expression part (Fig 4B). Thus, a larger number of addresses can be expressed in comparison with the BCD address expression so as to cope with increase of the disk capacity. Then a disk of high density can be discriminated from an existing disk by means of a single specific bit such as an MSB of the address expression part or plural bits or in accordance with the changing way of an address.

公开(公告)号：JP2001167510A

公开(公告)日：2001-06-22

申请号：JP2000297188

申请日：2000-09-28

Applicant: SONY CORP

Inventor： IIDA MICHIHIKO ,  KAWASHIMA TETSUJI ,  OTA SHINJI

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

Abstract: PROBLEM TO BE SOLVED: To easily discriminate whether or not an optical disk is made large in recording capacity. SOLUTION: The optical disk 10 is rotated at a required speed and on a required position, and a signal recorded on the optical disk is read. When the optical disk is an read-out exclusive optical disk, a frequency of a clock CKRF of a regenerative signal is detected with a control port 50. Because of the frequency of the clock of a standard optical disk is different from a high density optical disk. For instance, when the recording density is double of the standard density, the clock frequency of the high density optical disk becomes 1.4 times. As another discrimination method, by large/small of a burst error signal based on a difference of a unit delay amount at an interleave processing time, the optical disk is discriminated. when the optical disk is a writable type, by detecting the frequency of a wobble signal, or detecting an error correction result of a round code, whether the optical disk is standard standard density one, or high density one is discriminated simply and surely, and the configuration is simple.

公开(公告)号：JPH11296309A

公开(公告)日：1999-10-29

申请号：JP9574498

申请日：1998-04-08

Applicant: SONY CORP

Inventor： SHISHIDO YUKIO ,  KAWASHIMA TETSUJI ,  YASUDA KAZUHIRO ,  NAKAMURA TADASHI ,  TSUKADA HIROSHI

IPC: G06F12/08 ,  G06F3/06 ,  G06F12/00 ,  G11B20/10

Abstract: PROBLEM TO BE SOLVED: To relieve a processing load on a control part and to quickly execute transfer processing by discriminating a cache hit at the time of a data transfer request from an external host equipment and transferring and outputting transfer possible data to the equipment without waiting a transfer indication from a system control part. SOLUTION: When the transfer request from a host computer 100 occurs, a system controller 10 executes reception processing of the transfer request. A buffer manager 21 recognizes respective retrieval condition setting parameters in accordance with the indication of a cache search and executes the search. When it is discriminated that a part or whole of data being a transfer request object cannot be transferred from a cache memory 20 by cache hit discrimination, a buffering operation concerning data which cannot be transferred is controlled in execution and also the transfer output of the data to the host equipment is controlled in accordance with that the data becomes transferable by the buffering operation.

公开(公告)号：JPH08185663A

公开(公告)日：1996-07-16

申请号：JP33766094

申请日：1994-12-28

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI ,  SATO MASASHI

IPC: G11B19/28 ,  G11B19/247

Abstract: PURPOSE: To shorten an access time and to reduce the power consumption by controlling the rotational speed of a spindle motor so that the rotational speed of a disk shaped storage medium become higher as compared with a speculated standard rotational speed. CONSTITUTION: Frequency-dividing ratios M and N of frequency-dividing circuits 42, 43 are set so as to correspond to laser beam irradiating positions by a system control circuit 41 and the rotational speed is changed by frequency- dividing ratios M and N recorded in a frequency-dividing ratio table 46 so as to correspond to the laser beam irradiating positions. Consequently, the rotational speed of a CD-ROM 2 is successively changed from a quadruple speed to a sextuple speed toward from an innermost peripheral to an outermost peripheral. Thus, since the variable range of the rotational speed is reduced as compared with that in the case of a CLV method and a time required for changing over the rotational speed is shortened by the amount, a seek time is shortened and also the power consumption is reduced.

公开(公告)号：JPH05205203A

公开(公告)日：1993-08-13

申请号：JP3447892

申请日：1992-01-24

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI ,  IWAASA SHIYOUJI

IPC: G11B5/02 ,  G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To reduce the influences of the magnetic field leaking from an electromagnetic actuator upon recording. CONSTITUTION:By changing the direction of a permanent magnet of an electromagnetic actuator and the direction of a current flowing in the electromagnetic actuator, this magneto-optical disk drive is driven in a manner that the direction of a synthesized magnetic field 38 of the leaking magnetic field generated when the disk drive is driven is agreed with that of a recording magnetic field 36 having smaller intensity than a recording magnetic field 37 in the opposite direction to the recording magnetic field 36.

公开(公告)号：JPH05144194A

公开(公告)日：1993-06-11

申请号：JP32663491

申请日：1991-11-15

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI ,  CHIAKI SUSUMU

IPC: G11B7/00 ,  G11B7/004 ,  G11B11/10 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18

Abstract: PURPOSE:To prevent the impossibility of data reproduction to the utmost and to improve the reliability of a magneto-optical disk system. CONSTITUTION:When a clamp defect occurs at the time of reproducing operation of a certain target sector with respect to the magneto-optical disk which is initialized such that in an MO area involving an address test area in which a first clamp area is set and a data recording area in which a second clamp area is set, a reproduced signal with the same polarity and the same level is obtained, the reproducing operation is restarted from a sector preceding to the target sector. With respect to the reproduced signal obtained from the first and second clamp areas of the sector preceding thereto, clamp is performed and the reproduced signal from the first clamp area of the target sector is not used for the clamp processing and for the data from the data recording area of the target sector, a reproducing processing is performed.

公开(公告)号：JPH04370551A

公开(公告)日：1992-12-22

申请号：JP17334491

申请日：1991-06-19

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI ,  KOBAYASHI SHOEI ,  CHIAKI SUSUMU

IPC: G11B11/10 ,  G11B11/105 ,  G11B20/12

Abstract: PURPOSE:To reduce the error of A/D-converted data by keeping the reference level of the reproduced RF signal of a magneto-optical disk constant. CONSTITUTION:At the time of recording the data to the bulk-erased magneto- optical disk 1, a reference recording area in which the definite data is recorded is provided in the recording area of the data, and simultaneously, the reproduced RF signal of this magneto-optical disk is supplied to a clamp circuit 11 to be clamped by reference voltage sampled in the above-mentioned reference recording area, and is converted into the signal of a definite reference level, and is supplied to an A/D converter 12.

公开(公告)号：JPH04362551A

公开(公告)日：1992-12-15

申请号：JP16251091

申请日：1991-06-07

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI ,  KOBAYASHI SHOEI ,  CHIAKI SUSUMU

IPC: G11B7/00 ,  G11B7/005 ,  G11B7/0055 ,  G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To make the reference level of a regenerative RF signal constant for the optical magnetic disk. CONSTITUTION:A bulk erasing is operated so as to provide a whole recording surface with the magnetic pole of a single direction by magnetizing a whole optical disk 1 in a strong magnetic field and then, the regenerative RF signal from a mirror surface existent in the address area of this optical magnetic disk is detected by a sample pulse P(M) at the time of regeneration. With this detected level as a clamp voltage the clamping of the regenerative RF signal regenerated by the data recording area is operated at a clamp circuit 11.