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257 条记录 (耗时 0.027 秒)

    Information recording and reproducing device with reproduction and automatic gain control circuit
    81.
    发明授权
    Information recording and reproducing device with reproduction and automatic gain control circuit 失效
    具有再现和自动增益控制电路的信息记录和再现装置

    公开(公告)号：US5361247A

    公开(公告)日：1994-11-01

    申请号：US581218

    申请日：1990-09-11

    申请人： Hiroshi Fuji ,  Toshihisa Deguchi ,  Shigeo Terashima ,  Takeshi Yamaguchi

    发明人： Hiroshi Fuji ,  Toshihisa Deguchi ,  Shigeo Terashima ,  Takeshi Yamaguchi

    IPC分类号： G11B7/005 ,  G11B20/10 ,  G11B20/12 ,  G11B7/00

    CPC分类号： G11B7/005 ,  G11B20/10009 ,  G11B20/1217

    摘要： An information recording and reproducing device having an automatic gain control device wherein its amplification degree is adjusted according to an AGC voltage varying with an amplitude of a reproduced signal. The automatic gain control device has a holding circuit which holds the AGC voltage in each of recording and erasing operations, and also holds the AGC voltage in reproducing an un-recorded area of information. The AGC voltage is also used for determining an optimum recording condition for a recording medium. Instead of the holding circuit, by installing a limiter circuit for limiting an amplitude of a reproduced signal, and by the use of transient response of the reproduced signal due to an coupling situated before the limiter circuit, an appropriate amplification degree can also be obtained in the automatic gain control device. Further, the limiter circuit which is disposed at a stage before a reproduction circuit and also before a capacitor having the ac coupling, may restrain influence of the transient response of the ac coupling given on the reproduced signal, thereby making it possible to reproduce a signal with small amplitude immediately after recording or erasing operation.

    摘要翻译： 一种具有自动增益控制装置的信息记录和再现装置，其中根据以再现信号的幅度变化的AGC电压来调节其放大度。 自动增益控制装置具有在每次记录和擦除操作中保持AGC电压的保持电路，并且还保持AGC电压再现未记录的信息区域。 AGC电压也用于确定记录介质的最佳记录条件。 代替保持电路，通过安装用于限制再现信号的幅度的限制电路，并且由于由于位于限幅器电路之前的耦合而使用再现信号的瞬态响应，也可以获得适当的放大度 自动增益控制装置。 此外，设置在再现电路之前的阶段以及具有交流耦合的电容器之前的限幅器电路可以抑制对再现信号给出的交流耦合的瞬态响应的影响，从而可以再现信号 在记录或擦除操作后立即具有小幅度。

    Optical memory system for generating a timing control signal for detecting a recorded region through a playback signal
    82.
    发明授权
    Optical memory system for generating a timing control signal for detecting a recorded region through a playback signal 失效
    光存储系统，用于产生用于通过重放信号检测记录区域的定时控制信号

    公开(公告)号：US5134607A

    公开(公告)日：1992-07-28

    申请号：US564799

    申请日：1990-08-09

    申请人： Hiroshi Fuji ,  Shigemi Maeda ,  Noriaki Sakamoto ,  Shigeo Terashima ,  Takeshi Yamaguchi ,  Kentaro Tsuji ,  Kunio Kojima

    发明人： Hiroshi Fuji ,  Shigemi Maeda ,  Noriaki Sakamoto ,  Shigeo Terashima ,  Takeshi Yamaguchi ,  Kentaro Tsuji ,  Kunio Kojima

    IPC分类号： G11B7/004 ,  G11B11/105 ,  G11B27/30

    CPC分类号： G11B11/10504 ,  G11B11/10515 ,  G11B11/10517 ,  G11B11/10597 ,  G11B27/30 ,  G11B7/004

    摘要： An optical memory device for recording, reproducing, or erasing information applies an optical beam such as a laser beam onto a recording medium. The optical memory device includes a recorded region detecting circuit for detecting information recorded region formed in the recording medium. In the optical memory device, a timing control for recording, reproducing, or erasing is performed with the use of a result obtained through detection of a synchronizing signal, such as a sector mark, indicative of a starting point of an information block and another result obtained through detection in the recorded region detecting circuit. The recorded region detecting circuit includes either at least one peak hold circuit for detecting a peak level of the playback signal or a low pass filter for smoothing the playback signal, and a comparator for comparing an output obtained through the peak hold circuit or through the low pass filter with a reference voltage.

    摘要翻译： 用于记录，再现或擦除信息的光学存储器件将诸如激光束的光束应用到记录介质上。 光学存储器件包括用于检测在记录介质中形成的信息记录区域的记录区域检测电路。 在光学存储器件中，通过使用通过检测指示信息块的起点的同步信号（例如扇区标记）和另一结果而获得的结果来执行用于记录，再现或擦除的定时控制 通过在记录区域检测电路中的检测获得。 记录区域检测电路包括用于检测重放信号的峰值电平的至少一个峰值保持电路或用于平滑重放信号的低通滤波器，以及比较器，用于比较通过峰值保持电路获得的输出或通过低电平 带有参考电压的滤波器。

    Track access and laser beam alignment system for an optical recording and reproduction apparatus
    83.
    发明授权
    Track access and laser beam alignment system for an optical recording and reproduction apparatus 失效
    用于光学记录和再现装置的轨道访问和激光束对准系统

    公开(公告)号：US5107472A

    公开(公告)日：1992-04-21

    申请号：US376412

    申请日：1989-07-05

    申请人： Tsuneo Fujiwara ,  Masaru Nomura ,  Toshihisa Deguchi ,  Kunio Kojima ,  Takeshi Yamaguchi

    发明人： Tsuneo Fujiwara ,  Masaru Nomura ,  Toshihisa Deguchi ,  Kunio Kojima ,  Takeshi Yamaguchi

    IPC分类号： G11B7/0033 ,  G11B7/085 ,  G11B7/14 ,  G11B11/105

    CPC分类号： G11B11/10563 ,  G11B7/0033 ,  G11B7/085 ,  G11B7/14

    摘要： A track access operation system for an optical recording and reproducing apparatus using a medium having a plurality of guide grooves and ID sections utilized for identifying a particular guide groove. The intensity of reflected light and transmitted light from each of a plurality of light beams projected on the recording medium is monitored for determining the location of the beam on the disk. The system is designed such that at least either the plurality of light beams or the plurality of ID sections of the guide grooves are so arranged such that more than half of the light beams or more than half of the ID sections do not overlap in a parallel direction along the guide grooves whereby the number of light beams simultaneously projected on the ID sections is limited to less than half of the total number of light beams projected on the recording medium. Accordingly, even when the collection of light beams move in a perpendicular direction to the guide grooves, the number of pulses in the pulse signal is not influenced by the ID signals but coincident with the number of the guiding grooves through which the light beams have actually passed. With use of the optical memory system having such an arrangement, an accurate measurement of light beam movement is obtained resulting in high accuracy of access operations.

    Optical memory device for recording, reproducing or erasing information onto a recording medium, including a recorded region detecting circuit.
    87.
    发明授权
    Optical memory device for recording, reproducing or erasing information onto a recording medium, including a recorded region detecting circuit. 失效
    用于在包括记录区域检测电路的记录介质上记录，再现或擦除信息的光学存储装置。

    公开(公告)号：US4924447A

    公开(公告)日：1990-05-08

    申请号：US12087

    申请日：1987-02-06

    申请人： Hiroshi Fuji ,  Shigemi Maeda ,  Noriaki Sakamoto ,  Shigeo Terashima ,  Takeshi Yamaguchi ,  Kentaro Tsuji ,  Kunio Kojima

    发明人： Hiroshi Fuji ,  Shigemi Maeda ,  Noriaki Sakamoto ,  Shigeo Terashima ,  Takeshi Yamaguchi ,  Kentaro Tsuji ,  Kunio Kojima

    IPC分类号： G11B7/004 ,  G11B11/105 ,  G11B27/30

    CPC分类号： G11B11/10504 ,  G11B11/10515 ,  G11B11/10517 ,  G11B11/10597 ,  G11B27/30 ,  G11B7/004

    摘要： An optical memory device for recording, reproducing or erasing information by applying an optical beam such as a laser beam onto a recording medium in which the optical memory device includes a recorded region detecting circuit for detecting information recorded in a specified region formed in the recording medium. The optical memory device also includes a timing control for recording, reproducing or erasing data with the use of one result obtained through detection of a synchronizing signal such as a sector mark indicative of a starting point of an information block and another result obtained through detection in the recorded region detecting circuit. The recorded region detecting circuit contains either of at least one peak hold circuit for detecting a peak level of the playback signal and a low pass filter for smoothing the playback signal, and a comparator for comparing an output obtained through the peak hold circuit or through the low pass filter with a reference voltage.

    摘要翻译： 一种用于通过将诸如激光束的光束施加到记录介质上来记录，再现或擦除信息的光学存储器件，其中光学存储器件包括用于检测记录在记录介质中形成的指定区域中的信息的记录区域检测电路 。 光学存储装置还包括一个定时控制，用于通过使用通过检测同步信号获得的一个结果来记录，再现或擦除数据，所述同步信号例如是指示信息块起始点的扇区标记，以及通过检测获得的另一结果 记录区域检测电路。 记录区域检测电路包括用于检测重放信号的峰值电平的至少一个峰值保持电路和用于平滑重放信号的低通滤波器，以及用于比较通过峰值保持电路获得的输出或通过 具有参考电压的低通滤波器。

    Optical disc record reproducing apparatus
    90.
    发明授权
    Optical disc record reproducing apparatus 失效
    光盘记录重放装置

    公开(公告)号：US4788674A

    公开(公告)日：1988-11-29

    申请号：US902593

    申请日：1986-09-02

    申请人： Shigemi Maeda ,  Toshihisa Deguchi ,  Takeshi Yamaguchi ,  Shozou Kobayashi

    发明人： Shigemi Maeda ,  Toshihisa Deguchi ,  Takeshi Yamaguchi ,  Shozou Kobayashi

    IPC分类号： G11B7/005 ,  G11B7/125 ,  G11B11/105 ,  G11B27/36 ,  G11B7/00

    CPC分类号： G11B7/126 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/1053 ,  G11B11/10597 ,  G11B27/36 ,  G11B7/005

    摘要： An optical disc apparatus provided with a recording correcting system for controlling variations in the recorded bit length. The recording correcting system may be controlled not only while the apparatus is put to work, but also during unoccupied times when the recording, reproducing, and erasing operations are not required from a higher level apparatus. Also, the controlling operation may be performed so that the value of the record correction may be renewed at proper time intervals. The repetition of the correction trial at the proper interval allows a time lapse after the apparatus power-supply is put to work to occur with no undesirable effects and the characteristic variation between respective discs during the disc exchange can be coped with.

    摘要翻译： 一种具有记录校正系统的光盘装置，用于控制记录位长度的变化。 记录校正系统不仅可以在设备工作时被控制，而且可以在不需要较高级设备的记录，再现和擦除操作的空闲时间期间被控制。 此外，可以执行控制操作，使得可以以适当的时间间隔更新记录校正的值。 以适当的间隔重复校正试验允许在设备供电工作发生之后发生不期望的影响的时间流逝，并且可以应对在盘更换期间各个盘之间的特性变化。