公开(公告)号：US5010540A

公开(公告)日：1991-04-23

申请号：US225892

申请日：1988-07-29

申请人： Hiroshi Fuji ,  Tsuneo Fujiwara ,  Takashi Iwaki ,  Tomiyuki Numata ,  Kentaroh Tsuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

发明人： Hiroshi Fuji ,  Tsuneo Fujiwara ,  Takashi Iwaki ,  Tomiyuki Numata ,  Kentaroh Tsuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

IPC分类号： G11B19/247

CPC分类号： G11B19/247

摘要： An apparatus for recording and reproducing information on and from an optical disk includes a first control for producing a first control signal for controlling the rotational speed of a rotational driving apparatus, on the basis of the detected radial position; a judging apparatus which judges whether or not the reproduced signals are reproduced from a recorded region of the optical disk; a second control for producing a second control signal for controlling the rotational speed of the rotational driving apparatus, on the basis of the signals reproduced from the disk; and a switch apparatus which switches the circuit so that the rotational driving apparatus is controlled by the first control signal when the reproduced signals are not reproduced from a non-recorded region, and controlled by the second control signal when the reproduced signals are reproduced from a recorded region.

公开(公告)号：US4906874A

公开(公告)日：1990-03-06

申请号：US299001

申请日：1989-01-19

申请人： Hiroshi Fuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

发明人： Hiroshi Fuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/005 ,  G11B7/125 ,  G11B7/13 ,  G11B11/105 ,  G11B19/04 ,  G11B20/24

CPC分类号： G11B7/126 ,  G11B11/10502 ,  G11B11/10595 ,  G11B19/04 ,  G11B7/00 ,  G11B7/004 ,  G11B7/13

摘要： An analog signal switching device for use in an optical memory device having a recording/erasing mode and a mode other than the recording/erasing mode is disclosed. The switching device includes a source for producing a switch control signal which is HIGH during the recording/erasing mode and LOW during the mode other than the recording/erasing mode. An analog switch is provided for receiving a direct input analog signal and a held input signal and for providing as output the direct input signal during the LOW state of the switch control signal, and the held input signal during the HIGH state of the switch control signal by a switching operation. Further provided is a mask signal generator for generating a mask signal which covers a period during the HIGH state of the switch control signal so as to cover a period during the switching operation of the analog switch, and a gate circuit controlled by the mask signal for allowing the direct input analog signal to pass therethrough during the absence of the mask signal and for preventing the held input signal to pass therethrough during the presence of the mask signal. Thus, noise signals produced by the switching operation of the analog switch are eliminated.

公开(公告)号：US4910479A

公开(公告)日：1990-03-20

申请号：US299013

申请日：1989-01-19

申请人： Hiroshi Fuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

发明人： Hiroshi Fuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B11/105 ,  G11B19/02 ,  G11B20/10

CPC分类号： G11B20/10027 ,  G11B11/10515 ,  G11B11/10597 ,  G11B19/02 ,  G11B20/10009 ,  G11B7/005

摘要： An automatic gain control device for use in an optical memory device has a circuit for producing an amplification control signal which is fed back to a gain control amplifier through a sample-hold circuit. A pulse train detection circuit is provided for detecting the pulse train indicating that the data stored are a on the optical memory device is being playedback. When the pulse train is detected, the sample-hold circuit is made inactive so that the amplification control signal is directly fed back to the gain control amplifier, and when the pulse train ends, the sample-hold circuit is made active to hold the amplification control signal obtained at the end of the pulse train and to produce the amplification control signal held in the sample-hold circuit.

公开(公告)号：US4954903A

公开(公告)日：1990-09-04

申请号：US245771

申请日：1988-09-19

申请人： Hiroshi Fuji ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima ,  Tsuneo Fujiwara

发明人： Hiroshi Fuji ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima ,  Tsuneo Fujiwara

IPC分类号： G11B20/10

CPC分类号： G11B20/10009

摘要： A digital signal reproduction apparatus includes a first differential circuit for differentiating a reproduction signal reproduced from a recording medium. This differential circuit outputs a first order differential signal and second differential circuit differentiates the first order differential signal of the reproduction signal and outputs a second order differential signal. A comparator compares the second order differential signal with a predetermined level to produce a window signal. A peak detecting circuit detects zero-cross points in the first order differential signal and outputs a peak detecting signal. A gate gates the peak detecting signal with the window signal to output a reproduction data signal.

公开(公告)号：US5166838A

公开(公告)日：1992-11-24

申请号：US498710

申请日：1990-03-26

申请人： Hiroshi Fuji ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima ,  Tsuneo Fujiwara

发明人： Hiroshi Fuji ,  Takeshi Yamaguchi ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima ,  Tsuneo Fujiwara

IPC分类号： G11B20/10

CPC分类号： G11B20/10009

摘要： A digital signal reproduction apparatus includes a first differential circuit for differentiating a reproduction signal reproduced from a recording medium. This differential circuit outputs a first order differential signal. A second differential circuit differentiates the first order differential signal of the reproduction signal and outputs a second order differential signal. A comparator compares the second order differential signal with a predetermined level to produce a window signal. A peak detecting circuit detects zero-cross points in the first order differential signal and outputs a peak detecting signal. A gate gates the peak detecting signal with the window signal to output a reproduction data signal.

摘要翻译： 数字信号再现装置包括用于区分从记录介质再现的再现信号的第一差分电路。 该差分电路输出一阶差分信号。 第二差分电路区分再现信号的一阶差分信号并输出​​二阶微分信号。 比较器将二阶差分信号与预定电平进行比较以产生窗口信号。 峰值检测电路检测一阶差分信号中的零交叉点，并输出峰值检测信号。 门通过窗口信号对峰值检测信号进行门极输出再现数据信号。

公开(公告)号：US5546364A

公开(公告)日：1996-08-13

申请号：US311452

申请日：1994-09-26

申请人： Hiroshi Fuji ,  Toshihisa Deguchi ,  Kunio Kojima ,  Takeshi Yamaguchi ,  Shigeo Terashima ,  Akira Takahashi ,  Kenji Ohta

发明人： Hiroshi Fuji ,  Toshihisa Deguchi ,  Kunio Kojima ,  Takeshi Yamaguchi ,  Shigeo Terashima ,  Akira Takahashi ,  Kenji Ohta

IPC分类号： G11B7/0045 ,  G11B7/005 ,  G11B7/013 ,  G11B11/105 ,  G11B13/04 ,  G11B7/12 ,  G11B11/12

CPC分类号： G11B7/24085 ,  G11B11/10504 ,  G11B11/10515 ,  G11B11/10528 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/013

摘要： A magneto-optical memory apparatus for enhancing the recording density of a magneto-optical recording medium, thereby to increase its recording capacity. The magneto-optical recording medium having recording marks, each having two ends in which information is recorded. The apparatus also includes an optical head arranged such that at the time of recording onto the magneto-optical recording medium, the recording marks are recorded such that the ends of each recording mark correspond to a second code of digital information composed of two different types of codes; at the time of reproduction, a light beam having a condensing spot is projected to the magneto-optical recording medium and, when a reproduction light containing reproduction information is entered to the optical head from the magneto-optical recording medium, a reproduction signal is supplied; and when the light beam is projected to a recording mark, an information pulse corresponding to the second code is generated in the reproduction signal, only when the reproduction light from the recording mark interferes with the reproduction light from the non-marking part; and a signal detector circuit for detecting the information pulse in the reproduction signal obtained from the optical head and for converting the reproduction signal into a digital reproduction signal.

摘要翻译： 一种用于增强磁光记录介质的记录密度的磁光存储装置，从而提高其记录容量。 具有记录标记的磁光记录介质，每个记录标记具有记录信息的两端。 该装置还包括一个光学头，其被配置为使得在记录到磁光记录介质上时，记录标记被记录为使得每个记录标记的端部对应于由两种不同类型的 代码; 在再现时，将具有聚光点的光束投影到磁光记录介质，并且当从磁光记录介质将包含再现信息的再现光输入到光头时，提供再现信号 ; 并且当光束投射到记录标记时，只有当来自记录标记的再现光干扰来自非标记部分的再现光时，才在再现信号中产生与第二代码相对应的信息脉冲; 以及信号检测器电路，用于检测从光头获得的再现信号中的信息脉冲，并将再现信号转换成数字再现信号。

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。

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。

公开(公告)号：US4999824A

公开(公告)日：1991-03-12

申请号：US440261

申请日：1989-11-22

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 magneto-optical memory device for recording, reproducing or erasing information by applying an optical beam such as a laser beam onto a magneto-optical recording medium, the magneto optical memory device including a recorded region detecting circuit for detecting information recorded region formed in the recording medium. In the memory, a timing control for recording, reproducing or erasing is performed 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 comprises a pair of peak hold circuits for detecting a peak levels of the playback signals and first and second selecting circuits for selecting one of the reproduced signals and for selecting one of two reference voltages with different voltage levels, respectively smoothing the playback signal, and a comparator for comparing the outputs of the first and second selecting circuits.

公开(公告)号：US5170389A

公开(公告)日：1992-12-08

申请号：US538340

申请日：1990-06-15

申请人： Tomiyuki Numata ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

发明人： Tomiyuki Numata ,  Kunio Kojima ,  Toshihisa Deguchi ,  Shigeo Terashima

IPC分类号： G11B7/125 ,  H01S5/068

CPC分类号： G11B7/126 ,  H01S5/06825

摘要： The invention provides an improvement of the conventional laser driving circuit mainly including a control logic circuit, a reproducing power producing circuit, and a recording power producing circuit for preventing a recording film of a disk from being damaged by a laser in a reproducing mode. The improved respect is addition of a voltage monitoring circuit and a bypass transistor for an abnormal signal. The voltage monitoring circuit monitors a voltage drop caused in the control logic circuit and supplies a voltage abnormality indicating signal, thereby causing the bypass transistor to be conductive for allowing the abnormal signal to be flown therethrough.