公开(公告)号：JP2001243722A

公开(公告)日：2001-09-07

申请号：JP2000054128

申请日：2000-02-29

Applicant: SONY CORP

Inventor： MIYAKE KUNIHIKO ,  KAWASHIMA TETSUJI

IPC: G11B20/12 ,  G11B19/02 ,  G11B19/12 ,  G11B27/10

Abstract: PROBLEM TO BE SOLVED: To expand an address expression range while maintaining the interchangeability with a standard disk. SOLUTION: Expression range as an address value is expanded by representing a 'second' which is a 16-bit binary code by using minute information, second information and frame information in sub-codes or wobbling grooves as a disk recording medium of a CD format.

公开(公告)号：JP2001176082A

公开(公告)日：2001-06-29

申请号：JP35209199

申请日：1999-12-10

Applicant: SONY CORP

Inventor： SHISHIDO YUKIO ,  KAWASHIMA TETSUJI

IPC: G11B19/12 ,  G11B7/004 ,  G11B7/007 ,  G11B27/19 ,  G11B27/24 ,  G11B27/30

Abstract: PROBLEM TO BE SOLVED: To easily judge whether or not an optical disk is the disk whose recording capacitance has been made large. SOLUTION: The synchronizing pattern of ATIP information to be buried into the guide groove of a light spot is made to be the different synchronizing pattern in a high density optical disk, for example, '3T+3T+1T+1T' ('T' is the minimum channel bit of a signal which is obtained by reading position information) with respect to the synchronizing pattern of a standard density optical disk, which is '3T+1T+1T+3T', whose recording capacitance has not been made large. ATIP information is read and the synchronizing pattern is judged so that it can be easily and rapidly judged whether the optical disk is the standard density one or the high density one.

公开(公告)号：JP2001014694A

公开(公告)日：2001-01-19

申请号：JP18242799

申请日：1999-06-28

Applicant: SONY CORP

Inventor： IIDA MICHIHIKO ,  KAWASHIMA TETSUJI ,  MIYAKE KUNIHIKO

IPC: G11B7/09

Abstract: PROBLEM TO BE SOLVED: To make a stable tracking servo control performable even when a beam spot scans a linking section. SOLUTION: In a normal reproducing, switches 70a and 70d are connected to terminals 'a' side to bypass tracking error signals TE. In a linking section, the switches 70a and 70d are switched to terminals 'b' side to supply the signals TE to a hold circuit 70b so that low region components of the inputted tracking error signals TE are outputted. The switches 70a and 70d are controlled by control signals Cs2 supplied from a system controller based on linking signals, address information of the linking section, or the strength of reflected light beams from a disk. Thus, tracking error signals TE are held over a portion or all portion of the linking section.

公开(公告)号：JPH11185396A

公开(公告)日：1999-07-09

申请号：JP35465197

申请日：1997-12-24

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI

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

Abstract: PROBLEM TO BE SOLVED: To more stabilize a phase pulling-in operation by reducing a possibility that a frequency comparator acts as a disturbunce at the time of phase pulling-in. SOLUTION: The maximum value MAX of edge intervals among >= one frame periods and a reference value C2 are compared in an S17. In the case of MAX > C2, when the number of times of the case is >= a previously set value C3, the output of frequency comparisons is made an L (S26a) and the frequency of a VOC is lowered. In the case of MAX

公开(公告)号：JPH11167764A

公开(公告)日：1999-06-22

申请号：JP33192097

申请日：1997-12-02

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI

IPC: G11B19/12 ,  G11B19/28

Abstract: PROBLEM TO BE SOLVED: To provide a discriminating device for an optical record medium and a discriminating method for an optical record medium which can discriminate an optical disk at high speed and surely. SOLUTION: The discriminating device is provided with a two shaft actuator 5, a spindle motor 2, a photo-detector 13 and an RF amplifier 16, an RF binarized signal counter 25 counting a binarized signal of a reproduced information signal for a period being proportional to one rotation such as multiple of integer or the reciprocal-of-an-integer multiple of one rotation of an optical disk 1, and a DVD/CD discriminating section 27 comparing a counted value with the prescribed reference value. When a counted value is larger than the reference value, a medium is discriminated as an optical record medium (DVD) having high density, and when a counted value is smaller than the reference value, it is discriminated as an optical recording medium (CD) having low density.

公开(公告)号：JPH10125009A

公开(公告)日：1998-05-15

申请号：JP27034096

申请日：1996-10-11

Applicant: SONY CORP

Inventor： NAKAGAWA TOSHIYUKI ,  INO HIROYUKI ,  YOSHIMURA SHUNJI ,  KAI SHINICHI ,  NIIFUKU YOSHIHIDE ,  IIDA MICHIHIKO ,  KAWASHIMA TETSUJI ,  SATO MASASHI

IPC: G11B20/10 ,  G11B20/14 ,  H03M7/00 ,  H03M7/14 ,  H04L25/49

Abstract: PROBLEM TO BE SOLVED: To improve a bit error rate and secure a skew margin by a method wherein channel bit data are corrected when there is a location which does not meet conditions of the minimum continuous length and the maximum continuous length within the channel bit data obtained by binarizing a signal read out of a recording medium. SOLUTION: By using an n-tuple (n: an integer of 2 of more) clock obtained by making n-tuple a channel clock of reproduced data by a bit clock generating part 2, channel bit data which do not meet conditions of the minimum continuous length d7 of the same symbol are detected by a (d'-1) detection part 4, and a correction position of the channel bit data which have the continuous length (d'-1) of the same symbol is designated by a correction bit position designation part 5, and the channel bit data are corrected so that the minimum continuous length of the same symbol is set to be d' by a data correction part 6.

公开(公告)号：JPH1064092A

公开(公告)日：1998-03-06

申请号：JP23736496

申请日：1996-08-21

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI ,  AKITA MAMORU ,  YOSHIMURA SHUNJI

IPC: G11B7/00 ,  G11B7/005 ,  G11B7/09 ,  G11B7/095 ,  G11B20/10

Abstract: PROBLEM TO BE SOLVED: To perform a correct signal evaluation with a simple constitution by detecting phase error information from a readout data signal, obtaing an evaluation signal while making the absolute value of this information an analog signal and performing the quality evaluation of the signal while performing the A/D conversion of the evaluation signal. SOLUTION: A readout EMF signal from a binary circuit 25 is supplied to a PLL circuit and a reproducing clock PLCK synchronized with the EMF signal is generated to be supplied to necessary respective parts. Moreover, the EFM signal is also supplied to an evaluation signal generating circuit 35 and an evaluation signal HS is generated from the EFM signal and the reproducing clock PLCK in the circuit 35. This signal HS makes the phase error information between the EMF signal and the reproducing clock PLCK an absolute value and also an analog signal. The signal HS is supplied to the A/D conversion input port of a system controller and is made to be a digital value to be fetched in the controller. As a result, the controller can make the evaluation signal HS the scale of the quality evaluation of the signal. Thus, the correct quality evaluation of the reproduced signal is performed by a simple circuit constitution.

公开(公告)号：JPH07254228A

公开(公告)日：1995-10-03

申请号：JP4421694

申请日：1994-03-15

Applicant: SONY CORP

Inventor： FUNABASHI TAKESHI ,  KAWASHIMA TETSUJI

IPC: G11B20/10 ,  G11B7/00 ,  G11B7/0045 ,  G11B20/12

Abstract: PURPOSE:To obtain a efficient data control technology in the case compressed data are recorded in an optical disk drive. CONSTITUTION:When the compressed data, which are compressed with a data compressing engine 13 without loss (are recorded in a disk 1), an allocation corresponding table FAT, wherein the logic address of the data before compression received from a host computer 10, that is, the address controlled with the host computer 10 is made to correspond to the physical address of the data after the compression to be recorded in the disk 1, is recorded on the disk 1. Thus, the logic address specified by the host computer 10 can be readily converted into the physical address on the disk 1, which is controlled by a CPU 21, in reference to the content of the allocation corresponding table FAT.

公开(公告)号：JPH05314405A

公开(公告)日：1993-11-26

申请号：JP12827292

申请日：1992-04-21

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI ,  NAKAO SHINICHI

IPC: G11B5/02 ,  G11B5/40 ,  G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To suppress a temperature rise of a magnetic head and to prevent a decrease in quality of a record signal by increasing and decreasing a frequency of records in response to a time in which a current flows to the head within a predetermined time immediately before at each predetermined time after a recording is started. CONSTITUTION:A controller 41 receives a command from a host computer 44, and starts recording without reducing a transfer rate of a record in the case of recording. Then, the controller 41 starts counting of number of sectors, and obtains the number of the sectors recorded within a predetermined time immediately before at each predetermined time. If the obtained number of the sectors is larger than a set value, the transfer rate is reduced, and a magneto-optic disc 31 is recorded by a magnetic head 43 through a record data processor 42. Further, the controller 41 returns the transfer rate to an original rate if the rate is already reduced in the case where the obtained number of the sectors is not larger than the set value. Thus, a temperature rise of the head 43 is suppressed, and a recording quality is improved.

公开(公告)号：JPH04291003A

公开(公告)日：1992-10-15

申请号：JP8073891

申请日：1991-03-19

Applicant: SONY CORP

Inventor： KAWASHIMA TETSUJI

IPC: G11B5/02 ,  G11B11/10 ,  G11B11/105 ,  G11B33/00

Abstract: PURPOSE:To suppress unnecessary power consumption and heat radiation. CONSTITUTION:A recording signal outputted by a recording signal supply circuit 21 is supplied to the gates of an FETs 5 and 6, and current corresponding to a coil 7 or 8, respectively, flows. A CPU23 detects the frequency included in the recording signal via a reading circuit 22, controls a voltage control circuit 24 corresponding to the frequency and adjusts the bias voltage of amplifiers 3 and 4.