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71 条记录 (耗时 0.015 秒)

    Condenser lens for optical disks
    11.
    发明公开
    Condenser lens for optical disks 失效
    光盘用聚光镜

    公开(公告)号：EP0785543A3

    公开(公告)日：1997-07-30

    申请号：EP97100458.5

    申请日：1997-01-14

    申请人： NEC CORPORATION

    发明人： Yamanaka, Yutaka

    IPC分类号： G11B7/135

    CPC分类号： G11B7/1374 ,  G11B7/1353 ,  G11B7/13922 ,  G11B2007/0006

    摘要： A condenser lens (13) to be used for an optical head capable of recording or reading information on or from optical disks (6, 7) having different substrate thicknesses in an optical disk device such as a CD or the like. A light beam emitted from a laser light source (11) is focused by a condenser lens (13) to form a minute spot. The incident surface of the condenser lens (13) is divided into a plurality of division areas which are sufficiently small with respect to the lens opening. The division areas constitute first and second lens surfaces (14, 15) , that is, parts of lens surfaces of two different lenses. The light beam is focused by the first lens surface (14) to form a minute spot on a first optical disk (6) and by the second lens surface (15) to from a minute spot on a second optical disk (7). The two lenses can be optimized independently and be designed readily. One condenser lens (13) having the first and second lens surfaces (14, 15) can form two kinds of light beam spots and adaptable to two optical disks (6, 7) having different substrate thicknesses.

    摘要翻译： 一种聚光透镜（13），用于能够在诸如CD等的光盘装置中在具有不同基板厚度的光盘（6,7）上记录信息或从其读取信息的光学头。 从激光光源（11）发射的光束由聚光透镜（13）聚焦以形成微小点。 聚光透镜（13）的入射面被分割成相对于透镜开口足够小的多个分割区域。 分割区域构成第一和第二透镜表面（14,15），即，两个不同透镜的透镜表面的一部分。 该光束由第一透镜表面（14）聚焦以在第一光盘（6）上形成微小光点，并由第二透镜表面（15）在第二光盘（7）上形成微小光点。 这两个镜头可以独立进行优化，并且易于设计。 具有第一和第二透镜表面（14,15）的一个聚光透镜（13）可以形成两种光束点并且适用于具有不同衬底厚度的两个光盘（6,7）。

    Magneto-optical head system
    12.
    发明公开
    Magneto-optical head system 失效
    Systemfürmagneto-optischen Kopf。

    公开(公告)号：EP0547624A2

    公开(公告)日：1993-06-23

    申请号：EP92121587.7

    申请日：1992-12-18

    申请人： NEC CORPORATION

    发明人： Katayama, Ryuichi ,  Yamanaka, Yutaka

    IPC分类号： G11B11/10 ,  G11B7/13 ,  G11B7/135

    CPC分类号： G11B7/131 ,  G11B7/1353 ,  G11B11/10543 ,  G11B11/10576

    摘要： A magneto-optical head has first and second diffraction gratings, for diffracting a reflection light reflected at a magneto-optical disk. Further, the system is provided with a photodetector for detecting an error signal and an information signal in accordance with the diffracted lights supplied from the diffraction gratings, respectively.

    摘要翻译： 本发明的磁光头具有用于衍射在磁光盘上反射的反射光的第一和第二衍射光栅。 此外，该系统设置有用于分别根据从衍射光栅提供的衍射光检测误差信号和信息信号的光电检测器。

    Recording control method of rewritable type optical disc and drive unit for recording and reproducing the same
    14.
    发明公开
    Recording control method of rewritable type optical disc and drive unit for recording and reproducing the same 审中-公开
    用于记录可重写类型光盘的控制方法和记录单元和相关联的读

    公开(公告)号：EP1868198A1

    公开(公告)日：2007-12-19

    申请号：EP07108584.9

    申请日：2007-05-22

    申请人： NEC CORPORATION

    发明人： Yamanaka, Yutaka

    IPC分类号： G11B20/12 ,  G11B27/28

    CPC分类号： G11B20/1217 ,  G11B27/3027 ,  G11B27/322 ,  G11B2020/1222 ,  G11B2020/1285 ,  G11B2020/1287 ,  G11B2020/1288 ,  G11B2020/1295 ,  G11B2220/216 ,  G11B2220/218 ,  G11B2220/235 ,  G11B2220/2537

    摘要： In the recording on a rewritable optical disc (1), the searching time for the no data area is reduced. In this method, data is recorded in ECC blocks (20), each of which is a minimum unit region in the recording operation by the drive unit (33). Recording blocks (21) are assigned to the user data region (4) of the optical disc so that each recording block includes at least two ECC blocks. A bit map is generated. Every 1 bit data of the bit map represents the recording state of a recording block (21). By referencing the bit map, the area in which data is not recorded can be searched in a short time.

    摘要翻译： 在记录为可重写光盘（1），为对号数据区搜索时间被减少。 在该方法中，数据被记录在ECC块（20）的内容，每个魁的是在由所述驱动单元（33）的记录操作的最小单位区域。 记录块（21）被分配给光盘记录n表示每个块包括至少两个ECC块的用户数据区域（4）。 生成一个位图。 位图的每1位数据表示一个记录块（21）的记录状态。 通过引用位图，在Qui数据没有被记录的区域可以在很短的时间内搜索。

    Optical information recording medium and optical information reproducing apparatus
    15.
    发明公开
    Optical information recording medium and optical information reproducing apparatus 有权
    Optisches Informationsaufzeichnungsmedium und optischesInformationswiedergabegerät

    公开(公告)号：EP1742212A1

    公开(公告)日：2007-01-10

    申请号：EP06116115.4

    申请日：2006-06-27

    申请人： NEC CORPORATION

    发明人： Ohkubo, Shuichi ,  Yamanaka, Yutaka

    IPC分类号： G11B7/24 ,  G11B7/26

    CPC分类号： G11B7/26 ,  G11B7/24038

    摘要： In an optical information recording medium to which a recording operation or reproducing operation of information is carried out by irradiating a laser beam, there are provided with two recording layers provided through a space layer. An absolute value of a change Δd of a film thickness of the space layer for every unit length in a circumferential direction is equal to or less than a predetermined value which is determined based on a wavelength of the laser beam, a refractive index of the space layer in the wavelength λ and one of a line velocity of the laser beam and the shortest pit length in a pit sequence recorded in each of the recording layers.

    摘要翻译： 在通过照射激光束进行信息的记录操作或再现操作的光学信息记录介质中，设置有通过空间层设置的两个记录层。 每个单位长度的圆周方向上的空间层的膜厚的变化的绝对值d等于或小于基于激光束的波长确定的预定值， 波长λ的空间层，以及记录在每个记录层中的凹坑序列中的激光束的线速度和最短凹坑长度之一。

    Optical disc medium and optical disk recording and reproducing apparatus
    16.
    发明公开
    Optical disc medium and optical disk recording and reproducing apparatus 有权
    的光盘介质和装置用于记录和再现的光盘

    公开(公告)号：EP1591997A3

    公开(公告)日：2006-10-11

    申请号：EP05009345.9

    申请日：2005-04-28

    申请人： NEC CORPORATION

    发明人： Yamanaka, Yutaka

    IPC分类号： G11B7/007

    CPC分类号： G11B7/00745 ,  G11B7/0053 ,  G11B7/24082

    摘要： The present invention provides an optical disc apparatus capable of detecting recorded control information stably and an optical disc medium used for the optical disc apparatus. The optical disc medium is a recordable optical disc medium and configures such that a spiral shaped recording track is formed, an information addition area (21,22) separating a recording track by a predetermined length L is provided for each control information addition unit (25), having the length of less than 25 percent of the L. Also, the information addition area has a first arrangement (21) and a second arrangement (22) where the positions differ by substantially one-half of the L within the control information addition unit and the first arrangement and the second arrangement are selected such that the information addition area is adjacent not overlapping but being a predetermined distance apart in the recording track direction between recording tracks adjoining in the radial direction.

    Focused spot position-discriminating system and optical disk with guiding groove suited therefor
    20.
    发明公开
    Focused spot position-discriminating system and optical disk with guiding groove suited therefor 失效
    系统，用于确定聚焦的光点的位置，以及用于与导向槽适当的光学板

    公开(公告)号：EP0841657A1

    公开(公告)日：1998-05-13

    申请号：EP97119437.8

    申请日：1997-11-06

    申请人： NEC CORPORATION

    发明人： Yamanaka, Yutaka

    IPC分类号： G11B7/007 ,  G11B7/085

    CPC分类号： G11B7/08505 ,  G11B7/00718 ,  G11B7/24079

    摘要： It is an object of the invention to provide a focussed spot position-discriminating system and an optical disk with a guiding groove suited therefor. A laser light emitted from a laser light source is focussed on the optical disk with the guiding groove by an objective lens. The servo control circuit of a servo control system for controlling the position of the objective lens discriminates whether the focussed spot is on a land track or a groove track based on the offset of the focussing error signal. The depth of the guiding groove is selected to be λ/8 to λ/6 in order to obtain nearly the maximum offset of the focussing error signal.

    摘要翻译： 它是本发明的一个目的是提供一种焦斑判别位置的系统并对其光盘具有适合用于其的导向槽。 从激光光源发射的激光通过在物镜聚焦与导向槽在光盘上。 的伺服控制系统，用于控制物镜的位置的伺服控制电路判别是否焦斑是对一个国家轨道或基于所述聚焦误差信号的偏移的凹槽轨道。 导向槽的深度被选择为的λ/ 8到的λ/ 6，以获得几乎最大的聚焦误差信号的偏移。