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    • 1. 发明授权
    • Information reading and writing device for optical disk
    • 光盘信息读写装置
    • US06243334B1
    • 2001-06-05
    • US09177561
    • 1998-10-23
    • Shinya HasegawaHiroyasu Yoshikawa
    • Shinya HasegawaHiroyasu Yoshikawa
    • G11B7135
    • G11B7/131G11B7/0901G11B7/0908G11B7/0916G11B7/094G11B7/123G11B7/1353G11B7/22
    • The present invention relates to an information reading and writing device for an optical signal, and the optical system is simplified by using a diffraction optical element. A semiconductor laser is used as a light source. There is provided an image formation lens for condensing a beam of light and forming an image on an optical disk medium. In an optical path between the semiconductor laser and the image formation lens, there is provided a hologram having a function of the hologram region diffraction optical element for detecting a tracking error signal of the medium and a focus detection error signal. Two optical detecting elements 24a, 24b for detecting the focus error respectively have two divided regions. Under the condition that the medium is in focus, beams of light diffracted in the two hologram regions 23a, 23b for detecting the focus become the convergent beams which are most converged on a dividing line of the respective optical detecting element and in the direction of the optical axis. The beams of light on two optical detecting elements are in a condition of substantial point symmetry with respect to the central axis of the hologram.
    • 本发明涉及一种用于光信号的信息读写装置,通过使用衍射光学元件来简化光学系统。 半导体激光器用作光源。 提供了一种用于聚集光束并在光盘介质上形成图像的图像形成透镜。 在半导体激光器和图像形成透镜之间的光路中,提供了具有用于检测介质的跟踪误差信号的全息区域衍射光学元件的功能的全息图和焦点检测误差信号。 用于检测聚焦误差的两个光学检测元件24a,24b分别具有两个分割区域。 在介质聚焦的条件下,在用于检测聚焦的两个全息图区域23a,23b中衍射的光束成为最聚焦在各个光学检测元件的分割线上并沿着该方向的收敛光束 光轴。 两个光学检测元件上的光束相对于全息图的中心轴处于基本点对称的状态。
    • 3. 发明授权
    • Optical element utilized for optical storage unit and optical device
including the optical element
    • 用于光学存储单元的光学元件和包括光学元件的光学装置
    • US5745265A
    • 1998-04-28
    • US597710
    • 1996-02-07
    • Shinya HasegawaKohichi TezukaHiroyasu Yoshikawa
    • Shinya HasegawaKohichi TezukaHiroyasu Yoshikawa
    • G11B11/10G02B5/32G11B7/09G11B7/12G11B7/135G11B11/105G02B5/18
    • G11B7/1359G02B5/32G11B11/10545G11B7/0908G11B7/0916G11B7/123G11B7/1353G11B7/1365
    • An optical element for writing and reading signals for an optical storage unit, and an optical device including the optical element, include an optical substrate made of a material allowing the transmission of a laser beam emitted from a semiconductor laser and disposed between the semiconductor laser and an optical storage medium; a first hologram formed on the optical substrate in such a manner as to transmit the laser beam, and to allow it to be incident into the optical storage medium and to diffract the laser beam reflected by the optical storage medium inside the optical substrate; and a second hologram formed on the optical substrate in such a manner as to transmit one polarization component of the laser beam diffracted by the first hologram and propagating inside the optical substrate, to diffract the other polarization component and to thus separate both polarization components. A signal representing the state of the optical storage medium is detected by detecting the difference of the intensities between the polarization components so separated.
    • 一种用于写入和读取用于光学存储单元的信号的光学元件和包括该光学元件的光学装置,包括由能够透射从半导体激光器发射的激光束并且设置在半导体激光器和 光学存储介质; 形成在光学基板上的方式发射激光束的第一全息图,并允许其入射到光学存储介质中并将由光学存储介质反射的激光束衍射到光学基板内部; 以及形成在光学基板上的第二全息图,以便透射由第一全息图衍射并在光学基板内传播的激光束的一个偏振分量,以衍射另一个偏振分量,从而分离两个偏振分量。 通过检测如此分离的偏振分量之间的强度差来检测表示光存储介质的状态的信号。
    • 4. 发明授权
    • Optical device with improved focused error detection and tracing error
detection for optical disk drive
    • 具有改进的光盘驱动器的聚焦误差检测和跟踪误差检测的光学装置
    • US5754503A
    • 1998-05-19
    • US749231
    • 1996-11-14
    • Satoshi SenbaShinya HasegawaHiroyasu YoshikawaFumihiro Tawa
    • Satoshi SenbaShinya HasegawaHiroyasu YoshikawaFumihiro Tawa
    • G11B7/09G11B7/135G11B7/00
    • G11B7/1353G11B7/0908G11B7/0916
    • An optical device for an optical disk drive, for performing focusing error detection and tracking error detection of a laser beam converged on an optical disk. The optical device includes a diffraction grating having first, second, third, and fourth regions for diffracting a reflected beam from the optical disk in different directions. The optical device further includes a first photodetector for detecting a part of the reflected beam diffracted by the first region of the diffraction grating, a second photodetector for detecting a part of the reflected beam diffracted by the second region of the diffraction grating, a third photodetector for detecting a part of the reflected beam diffracted by the third region of the diffraction grating, and a fourth photodetector for detecting a part of the reflected beam diffracted by the fourth region of the diffraction grating. The shape and size of each of the first and second regions of the diffraction grating are optimally controlled to thereby increase a quantity of light incident on the photodetectors for focusing error detection.
    • 一种用于光盘驱动器的光学装置,用于执行会聚在光盘上的激光束的聚焦误差检测和跟踪误差检测。 光学装置包括具有第一,第二,第三和第四区域的衍射光栅,用于沿不同方向衍射来自光盘的反射光束。 光学装置还包括第一光电检测器,用于检测由衍射光栅的第一区域衍射的部分反射光束;第二光电检测器,用于检测由衍射光栅的第二区域衍射的部分反射光束;第三光电检测器 用于检测由衍射光栅的第三区域衍射的一部分反射光束;以及第四光电检测器,用于检测由衍射光栅的第四区域衍射的部分反射光束。 最佳地控制衍射光栅的第一和第二区域的形状和尺寸,从而增加入射到用于聚焦误差检测的光电探测器上的光量。
    • 10. 发明申请
    • DATA RECORDING DEVICE, DATA REPRODUCTION DEVICE, PROGRAM, AND RECORDING MEDIUM
    • 数据记录设备,数据复制设备,程序和记录介质
    • US20090157205A1
    • 2009-06-18
    • US12063412
    • 2006-08-03
    • Satoru InoueNorio ItohMasahiro ShioiShinya HasegawaAkemi Ohara
    • Satoru InoueNorio ItohMasahiro ShioiShinya HasegawaAkemi Ohara
    • G06F17/00
    • H04N7/163G11B27/034G11B27/3027G11B27/34G11B2020/1823H04N9/7921H04N21/4147H04N21/4325H04N21/4334H04N21/44209H04N21/4425
    • A data recording device of the invention has: a reception state acquisition processing section (21) for creating a reception state value on whether the reception state of a broadcast content is good or poor; a recording data creation process section (22) for creating recording data from them; and a recording control processing section (20) for comparing the reception state with a threshold value when there is a change in the reception state value, and controlling whether to pass the recording data to the recording data creation processing section (22). A data reproduction device of the invention has: a formatting analysis processing section for analyzing a format of the recorded data read from a recording medium and extracting the reception state value and the broadcast content; a reproduction control processing section for controlling reproduction of the received data according to the reception state value; a decoding section for decoding the content according to the reproduction control; and an output section for outputting the decoded content. This provides the data recording device capable of reducing a memory amount required for recording the content and the data reproduction device capable of reducing unpleasant feelings felt by a user upon reproduction of a content.
    • 本发明的数据记录装置具有:接收状态获取处理部(21),用于创建关于广播内容的接收状态是好还是差的接收状态值; 用于从其创建记录数据的记录数据创建处理部分(22); 以及记录控制处理部(20),用于当接收状态值发生变化时将接收状态与阈值进行比较,并且控制是否将记录数据传送到记录数据创建处理部分(22)。 本发明的数据再现装置具有:格式化分析处理部分,用于分析从记录介质读取的记录数据的格式并提取接收状态值和广播内容; 再现控制处理部分,用于根据接收状态值控制接收数据的再现; 解码部分,用于根据再现控制对内容进行解码; 以及用于输出解码的内容的输出部分。 这提供了能够减少用于记录内容所需的存储量的数据记录装置和能够减少用户在再现内容时感到的令人不快的感觉的数据再现装置。