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    OPTICAL DISK DEVICE AND RECORDING/PLAYBACK DEVICE
    1.
    发明公开
    OPTICAL DISK DEVICE AND RECORDING/PLAYBACK DEVICE 审中-公开

    公开(公告)号：EP4231297A1

    公开(公告)日：2023-08-23

    申请号：EP21879942.7

    申请日：2021-10-06

    申请人： Panasonic Intellectual Property Management Co., Ltd.

    发明人： KUZE, Yuuichi ,  YAJIMA, Masatoshi ,  KONISHI, Shinichi ,  NISHIOKA, Akihiko

    IPC分类号： G11B7/004 ,  G11B7/005 ,  G11B7/095 ,  G11B7/125 ,  G11B7/1275

    摘要： An optical disc device (2) includes: an optical pickup (4) including a first laser light source (10) that emits laser light, an objective lens (24) that focuses the laser light emitted from the first laser light source (10) onto an optical disc (8), and a light receiving element (30) that receives reflected light from the optical disc (8), and performs photoelectric conversion on the reflected light received to output a received-light signal; an FS signal generator (54) that generates an FS signal indicating the light amount of the reflected light from the optical disc (8), based on the received-light signal from the light receiving element (30); and a dirt determiner (56) that determines that dirt is present in the optical pickup (4), when the peak level of the FS signal is less than a dirt determination threshold, and controls the light receiving element (30) to increase the peak level of the received-light signal from the light receiving element (30).

    READ HEAD AND METHODS FOR READING MULTILAYER OPTICAL DATA STORAGE MEDIA
    2.
    发明公开
    READ HEAD AND METHODS FOR READING MULTILAYER OPTICAL DATA STORAGE MEDIA 审中-公开

    公开(公告)号：EP4141870A1

    公开(公告)日：2023-03-01

    申请号：EP21194152.1

    申请日：2021-08-31

    申请人： Microsoft Technology Licensing, LLC

    发明人： WILLIAMS, Hugh ,  LEGTCHENKO, Serguei, Anatolievitch ,  KUNKEL IV, William Minster ,  GOMEZ DIAZ, Ariel ,  WAINMAN, Philip, Athelstan ,  BLACK, Richard, John

    IPC分类号： G11B7/005 ,  G11B7/085

    摘要： Provided are a read head and methods for reading a multi-layered optical data storage medium comprising a transparent substrate having layers of voxels embedded therein. The read head comprises an imaging system for capturing images of groups of voxels, wherein the read head is configured to bring the imaging system into focus on variable depths in a multi-layered optical data storage medium; and an autofocus system for identifying depth positions of voxels in the multi-layered optical data storage medium by sampling an area in the optical data storage medium. The autofocus system comprises a light source for illuminating the area; and a detector for detecting light from the light source transmitted through the multi-layered optical data storage medium. A method of reading data from a multi-layered optical storage medium comprises capturing, using an imaging system, images of sectors in a first track. The multi-layered optical data storage medium and imaging system are held at fixed lateral positions during the capture of the images.

    INFORMATION RECORDING MEDIUM AND REPRODUCTION DEVICE
    3.
    发明公开
    INFORMATION RECORDING MEDIUM AND REPRODUCTION DEVICE 审中-公开

    公开(公告)号：EP4068285A1

    公开(公告)日：2022-10-05

    申请号：EP22174394.1

    申请日：2014-04-08

    申请人： Sharp Kabushiki Kaisha ,  Memory-Tech Holdings Inc.

    发明人： YAMADA, Hirohisa ,  NAKA, Takayuki ,  YAMAMOTO, Masaki ,  ADACHI, Yoshihisa ,  TAJIMA, Hideharu ,  KONISHI, Masahito

    IPC分类号： G11B7/007 ,  G11B7/005 ,  G11B7/24085 ,  G11B7/24097 ,  G11B20/12 ,  G11B27/00

    摘要： An information recording medium (300) comprises a first region (301) in which type identification information for identifying a type of the information recording medium (300) is recorded by recesses and/or protrusions which are formed by a given modulation method and whose lengths are longer than a length of an optical system resolution limit of a playback device (1), a second region (302) in which content data is recorded by recesses and/or protrusions which are formed by the given modulation method and which include a recess and/or a protrusion whose length is shorter than the length of the optical system resolution limit, and a blank region (303) between the first region and the second region. Here, the first region (301) contains first address information recorded therein in a first address data format, the second region (302) contains second address information recorded therein in a second address data format that differs from the first address data format, the blank region (303) is constituted by a group of recesses and/or protrusions in which no significant information other than an address is recorded, wherein a region of the blank region (303) which is closer to the first region (301) is provided with recesses and/or protrusions which are formed by the given modulation method, whose lengths are longer than the length of the optical system resolution limit, and which are suited to the first address data format, and a region of the blank region (303) which is closer to the second region (302) is provided with recesses and/or protrusions which are formed by the given modulation method, which include a recess and/or a protrusion whose length is shorter than the length of the optical system resolution limit, and which are suited to the second address data format, and the second region (302) has a track pitch shorter than that of the first region (301).

    REPRODUCTION DEVICE AND REPRODUCTION METHOD
    7.
    发明公开
    REPRODUCTION DEVICE AND REPRODUCTION METHOD 有权
    再生装置和再生方法

    公开(公告)号：EP3252772A1

    公开(公告)日：2017-12-06

    申请号：EP15879825.6

    申请日：2015-11-19

    申请人： Sony Corporation

    发明人： SEKIGUCHI, Koji ,  SAITO, Kimihiro

    IPC分类号： G11B7/005 ,  G11B7/135 ,  G11B20/10 ,  G11B20/18

    CPC分类号： G11B20/10046 ,  G11B7/005 ,  G11B7/00718 ,  G11B7/131 ,  G11B7/1365 ,  G11B20/10009

    摘要： A set of first signal light and reference light with a phase difference of almost 0 degree, a set of second signal light and reference light with a phase difference of almost 180 degrees, a set of third signal light and reference light with a phase difference of almost 90 degrees, and a set of fourth signal light and reference light with a phase difference of almost 270 degrees are generated. A first differential signal as a difference between a first light-receiving signal obtained by a first light-receiving element and a second light-receiving signal obtained by a second light-receiving element is calculated, and a second differential signal as a difference between a third light-receiving signal obtained by a third light-receiving element and a fourth light-receiving signal obtained by a fourth light-receiving element is calculated. The first differential signal and the second differential signal are supplied to respective FIR filters. An equalization error is formed from output signals from the FIR filters. Tap coefficients for the FIR filters are controlled to minimize the equalization error.

    摘要翻译： 一组第一信号光和具有几乎0度相位差的参考光，一组第二信号光和具有几乎180度相位差的参考光，一组第三信号光和具有相位差为 几乎90度，并且产生具有几乎270度的相位差的一组第四信号光和参考光。 计算作为由第一光接收元件获得的第一光接收信号和由第二光接收元件获得的第二光接收信号之间的差的第一差分信号以及作为第二差分信号 计算由第三光接收元件获得的第三光接收信号和由第四光接收元件获得的第四光接收信号。 第一差分信号和第二差分信号被提供给各个FIR滤波器。 均衡误差由FIR滤波器的输出信号形成。 控制FIR滤波器的抽头系数以最小化均衡误差。