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71 条记录 (耗时 0.015 秒)

    Optical disk medium and drive system
    2.
    发明公开
    Optical disk medium and drive system 审中-公开
    Optisches Plattenmedium和Treibersystem

    公开(公告)号：EP1942497A1

    公开(公告)日：2008-07-09

    申请号：EP08007780.3

    申请日：2003-05-07

    申请人： NEC Corporation

    发明人： Yamanaka, Yutaka

    IPC分类号： G11B7/095 ,  G11B7/24

    CPC分类号： G11B7/0956

    摘要： An optical disk medium and a drive system are provided that enable high density recording to be carried out. In the optical disk medium, recorded information tracks are formed in a concentric or spiral manner, and information is recorded and played back by irradiating the recorded information tracks with a laser beam through a transparent substrate or a transparent cover layer. A change in tilt of the optical disk medium over one circuit of each of the tracks is set equal to or less than an allowed value, a change in tilt over the entire surface of the optical disk medium is permitted to be larger than the allowed value, and low frequency bandwidth tilt control is carried out by the drive system.

    摘要翻译： 提供了能够进行高密度记录的光盘介质和驱动系统。 在光盘介质中，以同心或螺旋的方式形成记录的信息轨道，通过透明基板或透明覆盖层用激光束照射所记录的信息轨迹来记录和重放信息。 光盘介质在每个磁道的一个电路上的倾斜度的变化被设置为等于或小于允许值，允许在光盘介质的整个表面上的倾斜变化大于允许值 ，并且驱动系统执行低频带宽倾斜控制。

    Optical disc medium and optical disc device
    4.
    发明公开
    Optical disc medium and optical disc device 审中-公开
    光盘介质和光盘装置

    公开(公告)号：EP1729293A3

    公开(公告)日：2007-06-27

    申请号：EP06010502.0

    申请日：2006-05-22

    申请人： NEC Corporation

    发明人： Yamanaka, Yutaka

    IPC分类号： G11B7/007 ,  G11B7/24

    CPC分类号： G11B7/00736 ,  G11B7/08511 ,  G11B7/24038 ,  G11B2007/0013

    摘要： Areas, which are located on the inner peripheral sides of multi-layered information recording areas (20) and have the same radial ranges, are set as burst cutting area forming zones, and a burst cutting area (BCA) (101) is formed in one information recording layer. All of the same radial ranges of the other information recording layers are formed as mirror surfaces (5). Thereby, interference from other layers and scattering of readout light are prevented, so reading of the burst cutting area (BCA) is realized stably.

    Optical head having multiple light sources having different wavelengths
    7.
    发明公开
    Optical head having multiple light sources having different wavelengths 失效
    光学头具有多个具有不同波长的光源

    公开(公告)号：EP0831466A3

    公开(公告)日：1998-05-13

    申请号：EP97402199.0

    申请日：1997-09-22

    申请人： NEC CORPORATION

    发明人： Yamanaka, Yutaka

    IPC分类号： G11B7/08

    CPC分类号： G11B7/127 ,  G11B7/08 ,  G11B7/1356 ,  G11B2007/0006

    摘要： An optical head includes a fixed optical system having a first light source for outputting a first collimated light having a first wavelength, a first detection system for receiving a reflection of the first collimated light from a first optical disk having a first substrate thickness, a second light source outputting a second collimated light parallel to the first collimated light and having a second wavelength different than that of the first wavelength, and a second detection system for receiving a reflection of the second collimated light from a second optical disk having a second substrate thickness different than that of the first substrate thickness. A movable optical system includes an objective lens for focusing the first light on the first optical disk, and for focusing the second light on the second optical disk and an optical system for converting a wavefront of the second light and transmitting the second light to the objective lens. A driving system moves the movable optical system in a direction relative to the first collimated light.

    摘要翻译： 一种光学头包括：固定光学系统，具有用于输出具有第一波长的第一准直光的第一光源;第一检测系统，用于接收来自具有第一基底厚度的第一光盘的第一准直光的反射;第二 光源，输出平行于第一准直光并具有与第一波长不同的第二波长的第二准直光;以及第二检测系统，用于接收来自具有第二衬底厚度的第二光盘的第二准直光的反射 不同于第一基底厚度的。 可移动光学系统包括用于将第一光聚焦在第一光盘上并用于将第二光聚焦在第二光盘上的物镜和用于转换第二光的波前并将第二光传输到物镜的光学系统 镜片。 驱动系统在相对于第一准直光的方向上移动可移动光学系统。

    Optical head having multiple light sources having different wavelengths
    8.
    发明公开
    Optical head having multiple light sources having different wavelengths 失效
    Optischer Kopf mit mehreren Lichtquellen verschiedenerWellenlängen

    公开(公告)号：EP0831466A2

    公开(公告)日：1998-03-25

    申请号：EP97402199.0

    申请日：1997-09-22

    申请人： NEC CORPORATION

    发明人： Yamanaka, Yutaka

    IPC分类号： G11B7/08

    CPC分类号： G11B7/127 ,  G11B7/08 ,  G11B7/1356 ,  G11B2007/0006

    摘要： An optical head includes a fixed optical system having a first light source for outputting a first collimated light having a first wavelength, a first detection system for receiving a reflection of the first collimated light from a first optical disk having a first substrate thickness, a second light source outputting a second collimated light parallel to the first collimated light and having a second wavelength different than that of the first wavelength, and a second detection system for receiving a reflection of the second collimated light from a second optical disk having a second substrate thickness different than that of the first substrate thickness. A movable optical system includes an objective lens for focusing the first light on the first optical disk, and for focusing the second light on the second optical disk and an optical system for converting a wavefront of the second light and transmitting the second light to the objective lens. A driving system moves the movable optical system in a direction relative to the first collimated light.

    摘要翻译： 一种光头包括具有第一光源的固定光学系统，用于输出具有第一波长的第一准直光;第一检测系统，用于接收来自具有第一基板厚度的第一光盘的第一准直光的反射;第二 光源输出平行于第一准直光并且具有与第一波长不同的第二波长的第二准直光，以及第二检测系统，用于接收来自具有第二基板厚度的第二光盘的第二准直光的反射 不同于第一衬底厚度。 可移动光学系统包括用于将第一光聚焦在第一光盘上并用于将第二光聚焦在第二光盘上的物镜和用于转换第二光的波前并将第二光传输到目标的光学系统 镜片。 驱动系统沿相对于第一准直光的方向移动可移动光学系统。

    Focus error detection system for an optical head
    9.
    发明公开
    Focus error detection system for an optical head 失效
    Fokusfehlerermittlungssystemfüreinen optischen Kopf

    公开(公告)号：EP0829857A2

    公开(公告)日：1998-03-18

    申请号：EP97115455.4

    申请日：1997-09-05

    申请人： NEC CORPORATION

    发明人： Yamanaka, Yutaka

    IPC分类号： G11B7/09 ,  G11B7/135 ,  G11B7/13

    CPC分类号： G11B7/131 ,  G11B7/0908 ,  G11B7/0912 ,  G11B7/0916 ,  G11B7/094 ,  G11B7/0943 ,  G11B7/1356

    摘要： A focus error detection system in an optical head has an optical divider for dividing an optical beam reflected from an optical disk, and first and second light receiving areas on a photodetector for receiving the split optical beam. Each of the first and second light receiving areas has first and second light receiving sections divided by a boundary which receives one of the split optical beams at the center thereof. Both the difference signals obtained by subtracting the output of the first light receiving section from the output of the second light receiving section of the first and second light receiving areas are respectively normalized by summed signals obtained by adding the outputs of the first and second light receiving sections of the first and second light receiving areas. Both the normalized difference signals are added to obtain a focus error signal for a focus control of the optical head.

    摘要翻译： 光头中的聚焦误差检测系统具有用于分割从光盘反射的光束的光分路器和用于接收分离光束的光电检测器上的第一和第二光接收区域。 第一和第二光接收区域中的每一个具有被接收其中心处的分束光束之一的边界划分的第一和第二光接收部分。 通过从第一和第二光接收区域的第二光接收部分的输出中减去第一光接收部分的输出而获得的差分信号分别通过将第一和第二光接收的输出相加而获得的相加信号归一化 第一和第二光接收区域的部分。 归一化差分信号相加以获得用于光学头的聚焦控制的聚焦误差信号。

    Photodetector used for optical head
    10.
    发明公开
    Photodetector used for optical head 失效
    Photodetektorfüroptischen Kopf

    公开(公告)号：EP0790607A1

    公开(公告)日：1997-08-20

    申请号：EP97102451.8

    申请日：1997-02-14

    申请人： NEC CORPORATION

    发明人： Yamanaka, Yutaka

    IPC分类号： G11B7/13 ,  G11B7/135

    CPC分类号： G11B7/131 ,  G11B7/0037 ,  G11B7/133 ,  G11B7/1353 ,  G11B2007/0006

    摘要： There is provided an optical head including: a laser source (1); an objective lens (4) for focusing a light onto an optical recording medium (5, 6); and a photodetector (3) for receiving a light reflected from the optical recording medium and passing through the objective lens, characterized by the photodetector including a first light-receiving region (7a) for receiving a reflected light passing through a central portion of the objective lens and a second light-receiving region (7b) for receiving a reflected light passing through a non-central portion of the objective lens; and means (8) for selecting one of an output signal transmitted from the first light-receiving region and a sum of output signals transmitted from the first and second light-receiving regions in accordance with a thickness of the optical recording medium.

    摘要翻译： 提供了一种光学头，包括：激光源（1）; 用于将光聚焦到光学记录介质（5,6）上的物镜（4）; 以及用于接收从光记录介质反射并穿过物镜的光的光电检测器（3），其特征在于，所述光电检测器包括：第一受光区（7a），用于接收通过所述物镜的中心部分的反射光 透镜和用于接收通过物镜的非中心部分的反射光的第二光接收区域（7b） 以及用于根据所述光学记录介质的厚度选择从所述第一光接收区域发送的输出信号和从所述第一和第二光接收区域发送的输出信号之和的装置（8）。