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    3.
    发明专利
    未知

    公开(公告)号：BRPI0809922A2

    公开(公告)日：2014-10-07

    申请号：BRPI0809922

    申请日：2008-12-04

    Applicant: PANASONIC CORP

    Inventor： MIYASHITA HARUMITSU ,  HINO YASUMORI ,  NAKAMURA ATSUSHI ,  SHOJI MAMORU ,  OHNISHI KANJI

    IPC: G11B7/0045 ,  G11B7/007 ,  G11B7/125

    Abstract: Provided is an information recording medium which is compatible with a plurality of recording speeds and contains recording conditions of the recording speeds which have been recorded in advance. The recording conditions include: a parameter concerning a recording power for recording at each of the recording speeds and a parameter concerning a recording waveform; and other parameters concerning a recording power for performing a recording at a recording speed other than the aforementioned recording speeds by using a parameter concerning a recording waveform for performing a recording at the recording speed.

    5.
    发明专利
    未知

    公开(公告)号：BRPI0722380A2

    公开(公告)日：2012-06-12

    申请号：BRPI0722380

    申请日：2007-05-31

    Applicant: PANASONIC CORP

    Inventor： NAKAMURA ATSUSHI ,  MIYAGAWA NAOYASU

    IPC: G11B7/005 ,  G11B7/125

    Abstract: A reading devices suppresses deterioration of the recording marks caused by increasing the output laser power to compensate for a drop in the S/N ratio when reading at a high speed information recorded to a high density recording medium. To read information recorded to an optical data recording medium that is written and read using a laser beam output from a semiconductor laser, the reading method modulates a high frequency current on the drive current of the semiconductor laser to output the laser beam, and changes the light modulation rate according to the selected linear velocity used for reading. The light modulation rate is the ratio Pp/Pave between the peak power Pp and the average read power Pave of the light intensity of the high frequency modulated laser beam.

    Information recording medium and recording/reproducing device
    6.
    发明专利
    Information recording medium and recording/reproducing device 未知

    公开(公告)号：AU2009299344A1

    公开(公告)日：2010-04-08

    申请号：AU2009299344

    申请日：2009-09-25

    Applicant: PANASONIC CORP

    Inventor： KOBAYASHI ISAO ,  NAKAMURA ATSUSHI ,  HINO YASUMORI

    IPC: G11B7/0045 ,  G11B7/125

    Abstract: An information recording medium according to the present invention includes a track on which a data sequence including a plurality of recording marks and a plurality of spaces provided between the plurality of recording marks is recordable; and a recording condition recording area in which a recording condition for recording the data sequence on the track is recordable. Where a recording mark which is included in the data sequence and is to be formed on the track based on the recording condition is a first recording mark, when a length of the first recording mark is longer than a prescribed length, the recording condition is classified using a combination of the length of the first recording mark and a length of a first space located adjacently previous or subsequent to the first recording mark, and when the length of the first recording mark is equal to or shorter than the prescribed length, the recording condition is classified using a combination of the length of the first recording mark, the length of the first space, and a length of a second space not located adjacent to the first space and located adjacent to the first recording mark.

    OPTICAL DISC TEST METHOD AND OPTICAL DISC MEDIUM
    7.
    发明专利
    OPTICAL DISC TEST METHOD AND OPTICAL DISC MEDIUM 未知

    公开(公告)号：CA2686881A1

    公开(公告)日：2009-08-20

    申请号：CA2686881

    申请日：2009-02-10

    Applicant: PANASONIC CORP

    Inventor： FURUMIYA SHIGERU ,  NAKAMURA ATSUSHI

    IPC: G11B7/26 ,  G11B7/004

    Abstract: An optical disc test method includes a step that records data at a record ing speed (V1) at a first radius position of an optical disc, a second radiu s position the optical disc is more inside than the first radius position, a nd a third radius position that is more inside than the second radius positi on, respectively, and reproduces the recorded data, so as to measure signal quality index values (A, B, C) of the reproduced signal; a step that records data at a recording speed (V2) that is larger than the first recording spee d (V1) at the first radius position and the second radius position, respecti vely, and reproduces the recorded data, so as to measure signal quality inde x values (D, E) of the reproduced signal, respectively; and a step that corr ects the signal quality index (C) in accordance with a difference between th e signal quality index values (B and E), so as to record data at the second speed (V2) at the third radius position, and calculates a signal quality ind ex value (F) in the case of the reproduction of the recorded data.

    8.
    发明专利
    未知

    公开(公告)号：DE69840859D1

    公开(公告)日：2009-07-16

    申请号：DE69840859

    申请日：1998-06-03

    Applicant: PANASONIC CORP

    Inventor： SHOJI MAMORU ,  OHARA SHUNJI ,  NAKAMURA ATSUSHI ,  ISHIDA TAKASHI

    IPC: G11B7/00 ,  G11B7/007 ,  G11B7/09 ,  G11B7/095 ,  G11B7/125 ,  G11B20/10 ,  G11B20/18

    Abstract: An optical disk apparatus performing either one of recording and reproduction of an optical disk in which groove-shaped groove tracks and land tracks present between the groove tracks are alternately connected to each other in a spiral shape, includes: a recording and reproduction unit for recording a signal in at least one continuous groove track and at least one continuous land track, and then reproducing the signal from the groove track and the land track; a detector for detecting a quality of the signal recorded and reproduced by the recording and reproduction unit; a control parameter setting unit for setting a control parameter related to at least one of the recording and the reproduction of the optical disk; and a controller for changing the control parameter set by the control parameter setting unit, repeating the recording and reproduction performed by the recording and reproduction unit and detection performed by the detector every time the control parameter is changed, and determining the control parameter based on the quality of the signal detected by the detector.

    DISPOSITIVO DE LECTURA Y METODO DE LECTURA PARA MEDIO DE GRABACION DE DATOS OPTICO.
    9.
    发明专利
    DISPOSITIVO DE LECTURA Y METODO DE LECTURA PARA MEDIO DE GRABACION DE DATOS OPTICO. 未知

    公开(公告)号：MX2008015884A

    公开(公告)日：2009-04-22

    申请号：MX2008015884

    申请日：2007-05-31

    Applicant: PANASONIC CORP

    Inventor： NAKAMURA ATSUSHI ,  MIYAGAWA NAOYASU

    IPC: G11B7/005 ,  G11B7/125

    Abstract: Se describen dispositivos de lectura que suprimen el deterioro de las marcas de grabación provocados al incrementar la energía de láser de salida para compensar la salida en la proporción S/N, cuando se lee una información de alta velocidad grabada en un medio de grabación de alta densidad. Para leer información grabada a un medio de información de datos óptico que es escrito y leído utilizando un haz de láser emitido de un láser semiconductor, el método de lectura modula una corriente de alta frecuencia sobre la corriente de impulso del láser semiconductor para emitir el haz de láser y cambia la velocidad de modulación de luz de acuerdo con la velocidad lineal seleccionada usada para la lectura. La velocidad de modulación de luz es la proporción Pp/Pave entre la energía pico Pp y la energía de lectura promedio Pave de la intensidad de luz del haz de láser modulado de alta frecuencia.

    10.
    发明专利
    未知

    公开(公告)号：DE60137155D1

    公开(公告)日：2009-02-05

    申请号：DE60137155

    申请日：2001-12-26

    Applicant: PANASONIC CORP

    Inventor： GUSHIMA TOYOJI ,  FURUMIYA SHIGERU ,  ISHIDA TAKASHI ,  ISHIBASHI HIROMICHI ,  DEGUCHI HIRONORI ,  NAKAMURA ATSUSHI ,  MINAMINO JUNICHI ,  USUI MAKOTO ,  NAKAJIMA TAKESHI

    IPC: G11B7/0045 ,  G11B7/00 ,  G11B7/007 ,  G11B20/10 ,  G11B20/12 ,  G11B20/14 ,  G11B20/18 ,  G11B27/30

    Abstract: A recording medium comprising a recording area, wherein: the recording area includes a first area, the first area includes a fourth area including N number of frame areas, N being equal to or greater than 2, each of the N number of frame areas includes an area in which a synchronization code sequence (SY) and at least a portion of data (DATA) are to be recorded, wherein the synchronization code sequence (VF0) which is to be recorded in the frame area located at the start of the fourth area is different by a code distance equal to or greater than 2 in NRZI representation from any synchronization code sequence (SY) which is to be recorded in any of the frame areas of the fourth area other than the frame area (F0) located at the start of the fourth area, and the synchronization code sequence (SY) which is to be recorded in the frame area located at the start of the fourth area includes a pattern which does not occur in the portion of data (DATA).

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