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：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：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.

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：US5101386A

公开(公告)日：1992-03-31

申请号：US382233

申请日：1989-07-19

申请人： Kunio Kojima ,  Masaru Nomura ,  Tomiyuki Numata ,  Takashi Iwaki

发明人： Kunio Kojima ,  Masaru Nomura ,  Tomiyuki Numata ,  Takashi Iwaki

IPC分类号： G11B7/085

CPC分类号： G11B7/08517

摘要： A track jumping apparatus for an optical disk pickup which can detect a tracking error signal in performing a track jump, and determine a time of acceleration or deceleration of a jump signal by comparing the tracking error signal with a reference level, the track jumping apparatus comprising storing device for storing of standard values corresponding to the kinds of track jumps, standard value selecting device for selecting a standard value corresponding to a kind of track jump in performing the track jump, reference level setting device for setting a reference level so that the ratio of the reference level to a peak value of the tracking error signal agrees with a value based on the standard value selected by the standard value selecting device in performing the track jump, and standard value amending device for amending the standard value in the storing device selected at that moment according to a state of the tracking error signal at the end of the track jump.

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：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：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：US5729517A

公开(公告)日：1998-03-17

申请号：US740308

申请日：1996-10-28

申请人： Tsuneo Fujiwara ,  Tomiyuki Numata

发明人： Tsuneo Fujiwara ,  Tomiyuki Numata

IPC分类号： G11B20/10 ,  H04N5/76

CPC分类号： G11B20/10101 ,  G11B20/10009 ,  G11B20/10111

摘要： A clock extracting section generates a first clock synchronized with a reproducing signal, and a second clock with a frequency twice a frequency of the first clock. An AD converter quantizes the reproducing signal at timing of the second clock. A data classifier classifies the quantized data into two quantized data streams with a period of the first clock. Each equalizer equalizes the two quantized data streams to (1,1) and (1,2,1) partial response characteristics. Each branch metric arithmetic unit calculates a corresponding branch metric respectively. A synthesizer calculates a sum of them so as to generate a synthetic branch metric. An ACS circuit and a data decoding section Viterbi-decode data according to the synthetic branch metric. As a result, even if an SN ratio is lowered by increase in interference between codes and a noises at the time of recording at high density, an error of decoded data can be decreased.

摘要翻译： 时钟提取部分产生与再现信号同步的第一时钟和频率是第一时钟频率的两倍的第二时钟。 AD转换器在第二时钟的定时量化再现信号。 数据分类器将量化的数据分成具有第一时钟的周期的两个量化数据流。 每个均衡器将两个量化数据流均衡为（1,1）和（1,2,1）部分响应特性。 每个分支度量运算单元分别计算相应的分支度量。 合成器计算它们的和以便产生合成分支度量。 ACS电路和数据解码部分根据合成分支度量维特比解码数据。 结果，即使通过增加代码之间的干扰和在高密度记录时的噪声来降低SN比，可以减少解码数据的误差。

公开(公告)号：US5831953A

公开(公告)日：1998-11-03

申请号：US754534

申请日：1996-11-21

申请人： Tomiyuki Numata

发明人： Tomiyuki Numata

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/085 ,  G11B7/09 ,  G11B7/125 ,  G11B19/12

CPC分类号： G11B7/0945 ,  G11B19/12 ,  G11B7/0908 ,  G11B7/0941 ,  G11B2007/0006

摘要： An optical disk device of a simple structure using an optical pickup alone as read mechanism for detecting a thickness of the substrate of an optical disk. The optical disk device (1) carries out the focus search by moving the focal point of a laser beam emitted through an objective lens in a direction along the thickness of the optical disk in a region covering both the substrate surface and the recording layer, (2) converts S-shaped wave forms produced in a focus error signal FES from a two-piece photo-diode when the focal point passes through the substrate surface and recording layer, respectively into a digital signal CP.sub.out, and (3) detects a pulse interval of the digital signal CP.sub.out, by means of an MPU. Since the MPU detects the number of pulses of the digital signal CP.sub.out, the optical disk device can also detect the number of the recording layers.

摘要翻译： 一种简单结构的光盘装置，其使用单独的光学拾取器作为用于检测光盘的基板的厚度的读取机构。 光盘装置（1）通过在覆盖基板表面和记录层的区域中沿着光盘的厚度的方向移动通过物镜发射的激光束的焦点来进行聚焦搜索（ 2）当焦点通过衬底表面和记录层分别转换成数字信号CPout时，将从聚焦误差信号FES产生的S形波形转换成两片光电二极管，以及（3）检测脉冲 数字信号CPout的间隔，通过MPU。 由于MPU检测到数字信号CPout的脉冲数，所以光盘装置也可以检测记录层的数量。