公开(公告)号：US5315571A

公开(公告)日：1994-05-24

申请号：US100077

申请日：1993-07-29

申请人： Shigemi Maeda ,  Kunio Kojima ,  Jun Akiyama ,  Shigeo Terashima ,  Tomiyuki Numata

发明人： Shigemi Maeda ,  Kunio Kojima ,  Jun Akiyama ,  Shigeo Terashima ,  Tomiyuki Numata

IPC分类号： G11B7/004 ,  G11B7/085 ,  G11B11/105 ,  G11B19/12 ,  G11B19/24 ,  G11B20/10 ,  G11B20/14 ,  G11B21/08 ,  G11B27/32 ,  G11B7/00

CPC分类号： G11B20/10 ,  G11B11/10504 ,  G11B11/10515 ,  G11B11/10563 ,  G11B19/12 ,  G11B19/24 ,  G11B20/1403 ,  G11B21/085 ,  G11B27/327 ,  G11B7/004 ,  G11B7/08505 ,  G11B2020/1087 ,  G11B2020/10888 ,  G11B2220/20 ,  G11B2220/2525

摘要： An information recording and reproducing device has a first recording clock generation circuit which generates a clock based on pre-recorded information on a magneto-optical disk, a second recording clock generation circuit and a switching circuit The switching circuit selects a first recording clock when recording information is of discrete information and selects a second recording clock when recording information is of successive information. Moreover, in the present device, a first reading clock is used as well as a second clock as a clock for reading out the reproduced data from the magneto-optical disk, which had been once stored in memory. The second reading clock having a reference frequency is generated by a second clock generation circuit and is used for reading out successive information such as music information. The first reading clock in synchronization with the reproduced signal is generated by a first reading clock generation circuit and is used for reading out discrete information such as computer-use data. In addition, in the case of discrete information, it is possible to start recording/reproducing operation immediately after an optical head reaches a desired position, thereby permitting to shorten an access time.

摘要翻译： 信息记录和再现装置具有第一记录时钟产生电路，其基于磁光盘上的预先记录的信息产生时钟，第二记录时钟产生电路和切换电路。切换电路在记录时选择第一记录时钟 信息是离散信息，并且当记录信息是连续信息时选择第二记录时钟。 此外，在本装置中，使用第一读取时钟以及第二时钟作为用于从已经存储在存储器中的磁光盘读出再现数据的时钟。 具有参考频率的第二读取时钟由第二时钟产生电路产生，并且用于读出诸如音乐信息的连续信息。 与再现信号同步的第一读取时钟由第一读取时钟生成电路产生，并且用于读出诸如计算机使用数据的离散信息。 此外，在离散信息的情况下，可以在光头到达期望位置之后立即开始记录/再现操作，从而允许缩短访问时间。

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：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.

公开(公告)号：US5434829A

公开(公告)日：1995-07-18

申请号：US78003

申请日：1993-06-15

申请人： Shigemi Maeda ,  Tomiyuki Numata ,  Kunio Kojima

发明人： Shigemi Maeda ,  Tomiyuki Numata ,  Kunio Kojima

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B20/10 ,  G11B20/14

CPC分类号： G11B20/10 ,  G11B20/1403

摘要： An information reproducing apparatus has (1) a reference signal generating circuit for generating a first reference signal corresponding to reproduced signal of the main information; (2) a first switching circuit for selecting one of the reproduced signal and the first reference signal; and (3) a controller, which generates a selection instructing signal, for controlling such that the reproduced signal is selected during reproducing of the main information recorded area while the first reference signal is selected during reproducing of the main information unrecorded area. With the arrangement, when the main information unrecorded area is reproduced, the clock for carrying out the reproducing of main information is synchronized with the first reference signal which corresponds to the reproduced signal. So, when the reproducing area is changed from the main information unrecorded area to the main information recorded area, the synchronizing with the reproduced signal is carried out in a short time, thereby improving the reliability of the reproducing process.

摘要翻译： 信息再现装置具有：（1）参考信号发生电路，用于产生对应于主信息的再现信号的第一参考信号; （2）用于选择再现信号和第一参考信号之一的第一切换电路; 以及（3）产生选择指示信号的控制器，用于在再现主信息未记录区域期间选择第一参考信号时在主信息记录区域的再现期间选择重放信号。 利用这种布置，当主信息未记录区域被再现时，用于执行主信息再现的时钟与对应于再现信号的第一参考信号同步。 因此，当再现区域从主信息未记录区域改变到主信息记录区域时，与再现信号同步在短时间内进行，从而提高再现处理的可靠性。

公开(公告)号：US07206351B2

公开(公告)日：2007-04-17

申请号：US10154898

申请日：2002-05-24

申请人： Tetsuya Okumura ,  Jun Akiyama ,  Tomiyuki Numata ,  Shigemi Maeda ,  Masanori Ushioda

发明人： Tetsuya Okumura ,  Jun Akiyama ,  Tomiyuki Numata ,  Shigemi Maeda ,  Masanori Ushioda

IPC分类号： H04L5/12

CPC分类号： G11B11/10595 ,  G11B7/094 ,  G11B7/0956 ,  G11B7/1267 ,  G11B11/10504 ,  G11B11/10515 ,  G11B20/10009 ,  G11B20/10055 ,  G11B20/10101 ,  G11B20/10481 ,  G11B20/1426 ,  H03M5/145 ,  H03M7/46 ,  H03M13/15 ,  H03M13/3738 ,  H03M13/39 ,  H03M13/41 ,  H03M13/6312 ,  H03M13/6343

摘要： A signal evaluation device for evaluating a decoded signal of maximum likelihood decoding includes: a differential metric circuit for finding differential metrics; comparators for judging whether a difference of differential metrics exceeds a predetermined threshold; counters for counting respective output pulses of the comparators; and a controller for finding the probability of the differential metrics falling at or below the predetermined threshold, based on the number of measured samples and the number of samples counted by the counters, and processing the probability by arithmetic operations so as to obtain an index of signal evaluation. With this arrangement, signal evaluation devices for evaluating a recording medium or a recording medium driving device can have a simpler structure and can perform evaluations in a plurality of PR modes.

摘要翻译： 用于评估最大似然解码的解码信号的信号评估装置包括：用于找到差分度量的差分度量电路; 比较器，用于判断差分度量的差异是否超过预定阈值; 用于计数比较器的各个输出脉冲的计数器; 以及控制器，用于基于所述测量样本的数量和由所述计数器计数的采样数量，找出所述差分量度落在或低于所述预定阈值的概率，并且通过算术运算来处理所述概率，从而获得 信号评估。 通过这种布置，用于评估记录介质或记录介质驱动装置的信号评估装置可以具有更简单的结构，并且可以在多个PR模式中执行评估。

公开(公告)号：US06967917B1

公开(公告)日：2005-11-22

申请号：US09561856

申请日：2000-04-28

申请人： Tomiyuki Numata ,  Shigemi Maeda

发明人： Tomiyuki Numata ,  Shigemi Maeda

IPC分类号： G11B7/007 ,  G11B20/12 ,  G11B20/18 ,  G11B5/58

CPC分类号： G11B20/1883 ,  G11B7/007 ,  G11B2220/20

摘要： An optical disk using both grooves and lands as a recording track is provided with {circle around (1)} a data area for recording/reproducing data and {circle around (2)} DMAs (Data Management Areas) for managing a defective sector in the data area. The DMAs include four DMAs A–D all formed on the lands. The DMA B(D) is formed behind the ending sector of the DMA A(C). This arrangement realizes a DMA format having high resistance to defects and improving a processing rate. Consequently, highly reliable optical disk and optical disk apparatus can be provided.

摘要翻译： 使用凹槽和平台作为记录轨道的光盘设置有{围绕（1个用于记录/再现数据的数据区域和周围的圆圈（用于管理数据区域中的缺陷扇区的2个DMA（数据管理区域））。 DMA包括四个形成在地面上的DMA AD，DMA B（D）形成在DMA A（C）的结尾扇区之后，这样可以实现具有高抗缺陷性和提高处理速率的DMA格式。 可以提供高度可靠的光盘和光盘装置。

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：US5084848A

公开(公告)日：1992-01-28

申请号：US369124

申请日：1989-06-21

申请人： Toshihisa Deguchi ,  Tomiyuki Numata ,  Masaru Nomura ,  Kunio Kojima

发明人： Toshihisa Deguchi ,  Tomiyuki Numata ,  Masaru Nomura ,  Kunio Kojima

IPC分类号： G11B7/09

CPC分类号： G11B7/094

摘要： A feedback control apparatus in an optical recording and reproducing device for recording, reproducing and/or erasing data from an optical recording medium projects a light beam emitted from an optical head onto the optical recording medium. The apparatus includes an actuator for controlling the illuminating conditions of the light beam projected onto the optical recording medium, a detection unit for detecting the illuminating conditions of the light beam projected onto the optical recording medium, and a control amplifier for driving the actuator in accordance with a detection signal outputted from the detection unit, thereby controlling the illuminating conditions of the light beam projected onto the recording medium. The apparatus further includes a switching device for selectively switching from a detection signal from the detection unit to a reference signal, or vice versa, and for inputting into the control amplifier, the reference signal having the same signal level as that of a detection signal which is expected to be outputted from the detection unit when the illuminating conditions of the light beam projected onto the recording medium are appropriate. An offset compensation device outputs an offset compensation signal to the control amplifier. The offset compensation signal is set such that a control signal generated in the control amplifier has a predetermined signal level when the reference signal is inputted into the control amplifier. The apparatus prevents a DC offset from being included in the control signal from the control amplifier and reduces the procedures required for adjustment during the manufacturing process without employing expensive parts and devices and the like, thereby lowering the production costs.

公开(公告)号：US5008888A

公开(公告)日：1991-04-16

申请号：US384213

申请日：1989-07-21

申请人： Tomiyuki Numata ,  Takashi Iwaki ,  Kunio Kojima ,  Toshihisa DeGuchi

发明人： Tomiyuki Numata ,  Takashi Iwaki ,  Kunio Kojima ,  Toshihisa DeGuchi

IPC分类号： G11B11/10 ,  G11B7/125 ,  G11B11/105 ,  H01S5/06 ,  H01S5/062 ,  H01S5/0683

CPC分类号： G11B7/126 ,  H01S5/06209 ,  H01S5/0617 ,  H01S5/0683

摘要： A semiconductor laser driving apparatus for supplying a driving current to a semiconductor laser device of an optical disk recording and reproducing system, the level of which is changed to adjust the optical output of the laser device to one of plural levels corresponding to positions of an optical disk which is irradiated by a laser beam emitted from the laser device. The apparatus comprises: a current source for sequentially supplying plural reference driving currents having a different predetermined level to the laser device; a monitor for detecting the optical output level of the laser device when each of the reference driving currents is supplied to the laser device; a setting device for setting several optimum values on the basis of the detected optical output levels; a selecting device for selecting one of the several optimum values, depending upon the position of an optical disk where is to be irradiated by a laser beam; and said current source for supplying a driving current for recording information on an optical disk, to the laser device, the level of the driving current corresponding to the selected optimum value.