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：US5056076A

公开(公告)日：1991-10-08

申请号：US508538

申请日：1990-04-10

申请人： Kentaroh Tsuji ,  Hiroshi Fuji ,  Tomiyuki Numata ,  Tsuneo Fujiwara ,  Shigeo Terashima

发明人： Kentaroh Tsuji ,  Hiroshi Fuji ,  Tomiyuki Numata ,  Tsuneo Fujiwara ,  Shigeo Terashima

IPC分类号： G11B19/28 ,  G11B19/247

CPC分类号： G11B19/247

摘要： A method of controlling the rotational velocity of an information recording disk having one or more tracks in which patterns and marks are formed, the marks including at least one specific pattern having a predetermined length, which method comprises: measuring a time during which each of the patterns passes; detecting each of the marks on the basis of the values of the measured times; and controlling the rotational velocity of the disk on the basis of the measured time of the specific pattern of the detected mark, thereby making the linear velocity of the detected mark constant.

公开(公告)号：US5018120A

公开(公告)日：1991-05-21

申请号：US284669

申请日：1988-12-15

申请人： Kentaroh Tsuji ,  Tsuneo Fujiwara ,  Hiroshi Fuji ,  Shigeo Terashima ,  Tomiyuki Numata

发明人： Kentaroh Tsuji ,  Tsuneo Fujiwara ,  Hiroshi Fuji ,  Shigeo Terashima ,  Tomiyuki Numata

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/24 ,  G11B11/10 ,  G11B11/105 ,  G11B20/12 ,  G11B27/19 ,  G11B27/30

CPC分类号： G11B27/19 ,  G11B20/1251 ,  G11B27/3027 ,  G11B2020/10888 ,  G11B2220/2525 ,  G11B2220/2537

摘要： An optical disc medium indexing system having a plurality of elongated parallel tracks wherein each track contains a nonerasable index portion located in less than a single frame. The index portions are formed on the substrate of the disc by a plurality of indentations representing the absolute address of each track on the disc recorded in a multiplex format. Each index portion containing information on the mark, track number and CRC. The disc is constructed so that information may be recorded on the entire surface of the medium including the indexed portions.

公开(公告)号：US4993012A

公开(公告)日：1991-02-12

申请号：US201908

申请日：1988-06-03

申请人： Hiroshi Fuji ,  Tomiyuki Numata ,  Tsuneo Fujiwara ,  Kentaroh Tsuji

发明人： Hiroshi Fuji ,  Tomiyuki Numata ,  Tsuneo Fujiwara ,  Kentaroh Tsuji

IPC分类号： G11B11/10 ,  G11B11/105

CPC分类号： G11B11/10597

摘要： A magneto-optic record signal processing system uses a linearly polarized light beam to be projected onto a magneto-optic medium and a recorded signal is reproduced by analyzing the polarized conditions of a reflected light beam from the medium. This processing system also includes a recording face identifying device for determining the recording face of the magneto-optic record medium. To determine the recording face, an initialized area projecting device projects a light beam onto an initialized area of a magneto-optic record medium. A transducing circuit then converts a slant in a polarization plane of a reflected light beam from the initialized area into a light intensity. A photo-detector detects the light intensity outputted from the transducing means and a comparator compares the output from the photo-detector with a reference level to determine the magnetization of the recording face.

公开(公告)号：US4862443A

公开(公告)日：1989-08-29

申请号：US19707

申请日：1987-02-27

申请人： Kentaroh Tsuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Toshihisa Deguchi ,  Noriaki Sakamoto ,  Shigeo Terashima

发明人： Kentaroh Tsuji ,  Shigemi Maeda ,  Takeshi Yamaguchi ,  Toshihisa Deguchi ,  Noriaki Sakamoto ,  Shigeo Terashima

IPC分类号： G11B20/10 ,  G11B20/14 ,  G11B27/10 ,  H04L7/08 ,  H04N5/935

CPC分类号： H04N5/935 ,  G11B20/1403 ,  G11B20/1426

摘要： A sync signal detection apparatus is provided wherein a sync signal represents the top of recorded data. The sync signal includes a plurality of marks each having a different pattern from the pattern of any other mark. The apparatus is equipped with a circuit for sequentially detecting the patterns of the individual marks in a reproduction mode. Also, a circuit is provided generating a sync pulse at the top of the data in accordance with the address pattern of the mark after a predetermined number of marks are detected. The apparatus ensures accurate reproduction of the recorded data with a small number of bits and an increase in data reliability.

摘要翻译： 提供了同步信号检测装置，其中同步信号表示记录数据的顶部。 同步信号包括多个标记，每个标记具有与任何其他标记的图案不同的图案。 该装置配备有用于在再现模式中顺序地检测各个标记的图案的电路。 此外，提供电路，在检测到预定数量的标记之后，根据标记的地址图案在数据的顶部产生同步脉冲。 该装置确保以少量位精确地再现记录的数据并增加数据的可靠性。