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    • 95. 发明授权
    • Frequency demodulating circuit, optical disk apparatus thereof and preformating device
    • 频率解调电路,其光盘装置和预处理装置
    • US06678223B2
    • 2004-01-13
    • US10244402
    • 2002-09-17
    • Minoru TobitaSusumu TosakaYoshikatsu NiwaShinichi NakaoGoro Fujita
    • Minoru TobitaSusumu TosakaYoshikatsu NiwaShinichi NakaoGoro Fujita
    • G11B7005
    • G11B7/24082G11B7/00718G11B7/00745G11B7/128G11B7/26G11B7/261G11B11/10565G11B11/10578G11B11/10582G11B20/1403G11B27/19G11B27/24G11B2220/2525
    • An optical disk apparatus for driving an optical disk on which a groove wobble corresponding to a signal acquired from frequency modulation of biphase modulated address information, and a mark for representing phase information placed inside the wobble are preformatted, and having the biphase bit count “a” (“a” is a natural number) between two of the adjacent marks, and the channel bit count “n” (“n” is a natural number) between two of the adjacent marks. The apparatus includes first clock signal production device for generating a first clock signal utilizing an “n” frequency multiple of the reproduction signal of the clock mark, wobble signal reproduction device for reproducing from the optical disk a wobble signal corresponding to the groove wobble, and frequency demodulation device for acquiring the address information by frequency demodulation of the wobble signal. The frequency demodulation device has a second clock signal generator for generating a second clock signal by frequency dividing a data clock signal supplied from the first clock signal reproduction device by 1/M(M - - - n/(a·s)) in which a clock “s” (“s” is a natural number) is an oversampling value of the biphase bit, a waveform shaping unit for acquiring binary values by waveforming the wobble signal, and a detector for acquiring the address information by processing the second clock signal using the binary signal.
    • 一种光盘装置,用于驱动光盘,其上对应于从双相调制地址信息的频率调制获取的信号的槽摆动,以及用于表示放置在摆动内的相位信息的标记,并且具有双相位计数“a 两个相邻标记之间的“(”a“是自然数),并且两个相邻标记之间的通道位数”n“(”n“是自然数)。 该装置包括利用时钟标记的再现信号的“n”倍频产生第一时钟信号的第一时钟信号产生装置,用于从光盘再现与凹槽摆动相对应的摆动信号的摆动信号再现装置,以及 频率解调装置,用于通过摆动信号的频率解调获取地址信息。 频率解调装置具有第二时钟信号发生器,用于通过将从第一时钟信号再现装置提供的数据时钟信号分频1 / M(M - - n /(as))来产生第二时钟信号,其中时钟 “s”(“s”是自然数)是双相位的过采样值,波形整形单元,用于通过波形摆动信号来获取二进制值,以及检测器,用于通过处理第二时钟信号来获取地址信息,该检测器使用 二进制信号。
    • 96. 发明授权
    • Recording medium driving device for rotationally driving a disk-shaped recording medium having tilt detection means and tilt detection method
    • 用于旋转驱动具有倾斜检测装置和倾斜检测方法的盘形记录介质的记录介质驱动装置
    • US06526007B1
    • 2003-02-25
    • US09762680
    • 2001-03-16
    • Goro Fujita
    • Goro Fujita
    • G11B700
    • G11B7/00718G11B7/007G11B7/0938G11B7/0956
    • An optical disc reproducing device 10 has an optical pickup 11 for reading out digital data recorded on an optical disc, an amplitude detection circuit 18 for detecting the amplitude of a wobble component signal passed by a band pass filter 14, and a tilt detection, target value setting and drive signal generation circuit 23 for carrying out detection of the tilt quantity. In the optical disc reproducing device 10, a laser beam is cast by the optical pickup 11 onto an optical disc having a recording area with its one sidewall wobbled in a predetermined cycle, then the amplitude of each wobble component signal based on a return light in the case where the laser beam is located on the inner circle side or the outer circle side on the optical disc than the wobbled portion is detected by the amplitude detection circuit 18, and the differential value of the amplitude of the respective wobble component signals is found as a tilt indication value by the tilt detection, target value setting and drive signal generation circuit 23.
    • 光盘再现装置10具有用于读出记录在光盘上的数字数据的光学拾取器11,用于检测由带通滤波器14通过的摆动分量信号的幅度的振幅检测电路18和倾斜检测目标 值设定和驱动信号生成电路23,用于进行倾斜量的检测。 在光盘再现装置10中,激光束被光学拾取器11投射到具有其一个侧壁以预定周期摆动的记录区域的光盘上,然后基于返回光的每个摆动分量信号的振幅 通过振幅检测电路18检测激光束位于光盘的内圆侧或外圆侧的情况,并且找到各摆动分量信号的振幅的微分值 作为倾斜检测,目标值设定和驱动信号生成电路23的倾斜指示值。
    • 98. 发明授权
    • Photomagnetic recording medium and film forming method
    • 光磁记录介质和成膜方法
    • US6110610A
    • 2000-08-29
    • US871378
    • 1997-06-09
    • Goro FujitaMinehiro Tonosaki
    • Goro FujitaMinehiro Tonosaki
    • G11B7/254G11B11/105G11B5/66
    • G11B11/10586G11B11/10584G11B11/10589G11B7/254Y10S428/90
    • A magneto-optical disc in which, for preventing damage to a recording layer in case the foreign matter is sandwiched between a magnetic field modulation head and the magneto-optical disc, or the magnetic field modulation head is contacted for some reason with the magneto-optical disc, the direction of magnetization of the recording layer formed on a polycarbonate substrate, designed for transmitting the laser light, is switched by the magnetic field modulation head. The magnetic field modulation head is mounted floating in a direction opposite to the direction of incidence of the laser light from an optical head converged on an objective lens. A diamond-like carbon (DLC) protective film, composed of a thin DLC film, is provided on the surface of recording layer towards the magnetic field modulation head.
    • 一种磁光盘,其中为了防止异物夹在磁场调制头和磁光盘之间的情况下对记录层的损坏,或磁场调制头由于某些原因与磁光盘相接触, 通过磁场调制头切换设计用于透射激光的聚碳酸酯基板上形成的记录层的磁化方向。 磁场调制头被安装在与聚焦在物镜上的光学头相对的激光入射方向上浮动。 在磁记录层的表面向磁场调制头提供由薄DLC膜组成的类金刚石碳(DLC)保护膜。
    • 100. 发明授权
    • Methods and apparatus for reproducing data recorded on an optical
recording medium
    • 用于再现记录在光学记录介质上的数据的方法和装置
    • US5633854A
    • 1997-05-27
    • US291612
    • 1994-08-17
    • Hideyoshi HorimaiGoro Fujita
    • Hideyoshi HorimaiGoro Fujita
    • G11B7/0045G11B7/005G11B7/007G11B7/09G11B7/14G11B7/26G11B20/14H03M5/14G11B7/00
    • H03M5/14G11B20/1423G11B7/0045G11B7/005G11B7/0901G11B7/0938G11B7/14G11B7/261G11B7/00745G11B7/0943
    • An optical recording medium on which information data is to be recorded and on which an n-th recording track is located at a distance from the (n-1)th recording track preceding the n-th recording track in a recording region which is narrower than the diameter of a spot of a light beam radiated on the recording area, with recording data obtained on logical processing with recording data recorded on the (n-1)th recording track being recorded on the n-th recording track for increasing the storage capacity of information data, is disclosed. A return beam of a light beam radiated across two neighboring recording tracks on the optical recording medium is detected by a detector having first and second light receiving sections having a boundary line extending parallel to the recording track of the optical recording medium for reading out the information recorded on the optical recording medium based on the level of a sum or difference signal of the output signals of the first and second light receiving sections.
    • 在其上记录信息数据的光记录介质,并且第n个记录磁道位于与第n个记录磁道之前的第(n-1)个记录磁道相距一定距离处的记录区域 与记录在记录区域上的光束的点的直径相关联,利用记录在第(n-1)记录磁道上的记录数据的逻辑处理获得的记录数据被记录在第n个记录磁道上以增加存储 披露了信息数据的容量。 通过具有第一和第二光接收部分的检测器检测辐射在光记录介质上的两个相邻记录轨道上的光束的返回光束,该第一和第二光接收部分具有平行于光记录介质的记录轨道延伸的边界线,用于读出信息 基于第一和第二光接收部分的输出信号的和或差信号的电平,记录在光学记录介质上。