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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.
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公开(公告)号：US4864125A
公开(公告)日：1989-09-05
申请号：US104968
申请日：1987-10-06
申请人： Hisashi Minami , Toshihisa Deguchi , Masaru Nomura , Takao Hyuga
发明人： Hisashi Minami , Toshihisa Deguchi , Masaru Nomura , Takao Hyuga
IPC分类号： H02P3/08 , G11B11/10 , G11B11/105
CPC分类号： G11B11/1056
摘要： An extra magnetic field positioning apparatus includes a motor which does not have stable points for defining the extra magnetic field. An encoder is provided which is rotated with the motor and individually has the information which indicates rotating displacement and the information which indicates rotating position. Further, a sensor detects the information indicating the rotating position recorded on the encoder, and another sensor detects the information indicating the rotating displacement recorded on the encoder.
摘要翻译： 一种额外的磁场定位装置包括不具有用于限定额外磁场的稳定点的电动机。 提供与电动机一起旋转的编码器，并且分别具有指示旋转位移的信息和指示旋转位置的信息。 此外，传感器检测指示记录在编码器上的旋转位置的信息，并且另一个传感器检测指示记录在编码器上的旋转位移的信息。
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公开(公告)号：US5432768A
公开(公告)日：1995-07-11
申请号：US079743
申请日：1993-06-22
IPC分类号： G11B7/004 , G11B7/007 , G11B11/105 , G11B19/04 , G11B27/034 , G11B27/036 , G11B27/11 , G11B27/32 , G11B27/34 , G11B27/36 , G11B7/00
CPC分类号： G11B27/11 , G11B11/10502 , G11B11/10595 , G11B19/04 , G11B27/034 , G11B27/036 , G11B27/329 , G11B27/34 , G11B27/36 , G11B7/004 , G11B7/007 , G11B2220/2525 , G11B2220/65
摘要： A recording and reproducing device, which records and reproduces information on and from a rewritable recording medium having absolute addresses and including an information recording area wherein information entered from external devices is recorded and a Table of Contents area wherein additional address information with respect to the information recorded in the information recording area is recorded. The TOC area contains the absolute addresses of the recording positions of each information recorded in the information recording area. A display section graphically and independently displays the recorded and unrecorded ranges of the information recording area according to the absolute addresses recorded in the TOC area with respect to the recording positions of each piece of information. A warning device alerts the user that a position on the disc is occupied by referring TOC area when it is instructed to record new information in the position of the information recording area where another information has already been recorded.
摘要翻译： 一种记录和再现设备，其记录和重放具有绝对地址的可重写记录介质上的信息，并且包括其中记录了从外部设备输入的信息的信息记录区域，以及一个目录区域，其中关于该信息的附加地址信息 记录在信息记录区中的记录。 TOC区域包含记录在信息记录区域中的每个信息的记录位置的绝对地址。 显示部分根据相对于每条信息的记录位置记录在TOC区域中的绝对地址图形地和独立地显示信息记录区域的记录和未记录的范围。 当指示在记录了其他信息的信息记录区域的位置记录新信息时，警告装置通知引导TOC区域来警告用户盘上的位置。
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公开(公告)号：US5142521A
公开(公告)日：1992-08-25
申请号：US528497
申请日：1990-05-25
IPC分类号： G11B7/004 , G11B7/007 , G11B11/105 , G11B19/28 , G11B20/10 , G11B20/12 , G11B27/034 , G11B27/32
CPC分类号： G11B20/10 , G11B11/10563 , G11B11/10595 , G11B19/28 , G11B27/034 , G11B27/329 , G11B7/004 , G11B7/007 , G11B20/1258 , G11B2220/2525
摘要： A recording/reproducing device performs the recording/reproduction on a recording medium having an information recording area and a table of contents area. The recording medium is provided with guiding grooves that snake in cycles corresponding to values of absolute addresses. The device divides the information recording area into a plurality of domains. Each domain corresponds to a single sampling frequency with respect to the information being recorded. An electromagnet and an optical head record information in the domain that corresponds to its sampling frequency and records additional information concerning the division in the table of contents. A spindle motor drives the disk which is adjusted such that the velocity of the disk is changed for each domain during recording and reproduction. A demodulator obtains the absolute addresses through demodulation by comparing frequencies determined from the snaking cycles of the guiding grooves with a reference frequency. An operational circuit converts the demodulated absolute addresses in accordance with the velocity of the disk into corrected absolute addresses that represented the period of time which has elapsed since the starting time. As a result, the burden imposed on the spindle motor is relieved, the demodulation of the absolute addresses may be executed accurately even when the rotational speed of the disk varies, and the time elapsed since the start of the recording/reproduction may be determined.
摘要翻译： 记录/再现装置在具有信息记录区和内容区表的记录介质上执行记录/再现。 记录介质设置有与绝对地址值相对应的循环蛇形引导槽。 该设备将信息记录区域划分成多个域。 每个域对应于相对于正在记录的信息的单个采样频率。 一个电磁体和一个光头记录了与其采样频率相对应的域中的信息，并且记录了关于内容表中的划分的附加信息。 主轴电动机驱动盘，其被调整为使得在记录和再现期间每个域改变盘的速度。 解调器通过将从引导槽的蛇形周期确定的频率与参考频率进行比较来获得解调的绝对地址。 操作电路根据盘的速度将解调的绝对地址转换成表示自开始时间以来经过的时间段的校正绝对地址。 结果，减轻了主轴电机的负担，即使当盘的转速变化时也可以精确地执行绝对地址的解调，并且可以确定从记录/再现开始以来经过的时间。
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公开(公告)号：US5005164A
公开(公告)日：1991-04-02
申请号：US186580
申请日：1988-04-27
申请人： Noriaki Sakamoto , Shigemi Maeda , Toshihiro Yamanaka , Toshihisa Deguchi , Nobuyuki Horie , Takeshi Yamaguchi , Kunio Kojima
发明人： Noriaki Sakamoto , Shigemi Maeda , Toshihiro Yamanaka , Toshihisa Deguchi , Nobuyuki Horie , Takeshi Yamaguchi , Kunio Kojima
IPC分类号： G11B7/004 , G11B7/125 , G11B11/105 , G11B19/02
CPC分类号： G11B7/126 , G11B11/10597 , G11B19/02 , G11B7/004
摘要： A recording and reproducing apparatus is provided which includes a recording condition control device for controlling recording conditions during recording of a binary-coded original recording signal on a recording medium, a signal recording device for recording the original recording signal onto the recording medium according to recording conditions set by the recording condition control device, a reproducing signal output device for outputting binary-coded reproducing signals by detecting the recording signal as recorded on the recording medium by the signal recording device, and a recording condition setting device for obtaining the recording conditions to provide a reproducing signal approximately equal to the original recording signal through a comparison between the reproducing signal outputted from the reproducing signal output device and the original recording signal.
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公开(公告)号：US5001732A
公开(公告)日：1991-03-19
申请号：US458367
申请日：1989-12-28
CPC分类号： G11B7/08541
摘要： The track counter for optical disk in accordance with the present invention, that counts the number of tracks a light beam passes upon when an optical head moves over an optical disk in the radial direction, comprises a passage signal generating circuit for detecting based on a reflected light of the light beam from the optical disk, that the light beam passed upon a track and for releasing a passage signal on that occasion, a counter that counts the passage signals released by the passage signal generating circuit, a count suspending circuit for forecasting that the light beam will pass upon a specific position of a track and for suspending the count by the aforementioned counter of the passage signals during this forecasted period, and a count value compensating circuit for assuming, when the count of the passage signals is suspended by the count suspending circuit, the number of tracks the light beam passed upon during that period, and for adding this assumed number to the count value of the counter. This track counter for optical disk is arranged such that it is able to count accurately the number of tracks the light beam passed upon even when the light beam passed upon the ID sections of a track, or when the passage upon a track cannot be detected because of a scratch on the surface of the disk or the like. Thereby, when the optical head moves and slides, the access speed may be enhanced.
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公开(公告)号：US5301174A
公开(公告)日：1994-04-05
申请号：US550973
申请日：1990-07-11
CPC分类号： G11B7/08529 , G11B7/08517
摘要： An optical disk recording and reproducing apparatus in which during coarse access, an adjustable target speed is obtained using a speed offset value stored in a speed offset memory. The speed offset value being determined between a plurality of reference velocities and a plurality of adjustable offset velocity values. The system also performs fine access within a defined distance from the optical head to the designated track upon completion of the coarse access mode. The speed offset values are continually updated by to improve the accuracy of the coarse access operation saving overall access time.
摘要翻译： 一种光盘记录和再现装置，其中在粗略访问期间，使用存储在速度偏移存储器中的速度偏移值来获得可调节的目标速度。 速度偏移值在多个参考速度和多个可调偏移速度值之间确定。 在粗略访问模式完成时，该系统还在从光头到指定轨迹的限定距离内执行精细的访问。 速度偏移值不断更新，以提高粗略访问操作的精度，从而节省总体访问时间。
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18.发明授权
公开(公告)号：US4849953A
公开(公告)日：1989-07-18
申请号：US924262
申请日：1986-10-29
CPC分类号： G11B7/0956 , G11B7/08517 , G11B7/0901 , G11B7/094 , G11B7/0948
摘要： An optical information recording and reproducing apparatus comprising: a circuit for focusing a light beam on a recording track of an optical disk having tracks formed spirally or concentrically; a circuit for recording the information on a track corresponding to the focused position of light beam on the track or reproducing information from on the track; a tracking control circuit for generating a tracking control signal for matching the focused position of the light beam with the track; a circuit for detecting deviation of the focused position of the light beam from the track and generating a deviation signal corresponding to the focused position of the light beam; a holding circuit for holding the deviation signal; a subtracting circuit for subtracting the held deviation signal from the tracking control signal; and a circuit for moving an objective lens for controlling the focused position of the light beam in response the output signal from the subtracting circuit.
摘要翻译： 一种光信息记录和再现装置，包括：用于将光束聚焦在具有螺旋或同心的轨道的光盘的记录轨道上的电路; 用于将信息记录在与轨道的聚焦位置对应的轨道上或从轨道上再现信息的电路; 跟踪控制电路，用于产生用于将光束的聚焦位置与轨道匹配的跟踪控制信号; 用于检测来自光道的光束的聚焦位置的偏离并产生对应于光束的聚焦位置的偏差信号的电路; 用于保持偏差信号的保持电路; 减法电路，用于从跟踪控制信号中减去保持的偏差信号; 以及用于响应于来自减法电路的输出信号移动用于控制光束的聚焦位置的物镜的电路。
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公开(公告)号：US4782476A
公开(公告)日：1988-11-01
申请号：US65285
申请日：1987-06-22
CPC分类号： G11B7/0935
摘要： An objective lens-driving unit comprising a lens supporting means for supporting the objective lens having an optical axis vertical to a recording medium on which light beams converge through the objective lens so as to attain optical recording, optical playing and optical erasing of information on the recording medium; at least one driving means for driving said lens supporting means in the tracking direction; a driving means for driving said intermediate supporting means in the focusing direction, wherein said tracking direction-driving means comprises a magnetic circuit that produces magnetic flux in the circumferential direction of the recording medium, and a tracking direction-driving coil that is positioned to cross a gap formed in the magnetic circuit to thereby receive an electro-magnetic force due to an interaction between the magnetic field of the magnetic circuit and the current passing through said coil, said tracking direction-driving coil being positioned within the excitation area of the magnetic circuit even when said coil moves in the focusing direction.
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公开(公告)号：US5666345A
公开(公告)日：1997-09-09
申请号：US203619
申请日：1994-02-28
申请人： Akira Takahashi , Tetsuya Inui , Kenji Ohta , Toshihisa Deguchi , Kazuo Van
发明人： Akira Takahashi , Tetsuya Inui , Kenji Ohta , Toshihisa Deguchi , Kazuo Van
CPC分类号： G11B7/24085 , G11B7/0938 , G11B7/007
摘要： An optical memory disc medium contains a plurality of guide groove tracks. The guide groove tracks are arranged parallel to each other and they are used for controlling a position of a light beam. There is a land region between the guide groove tracks which is wider than the width of the guide groove tracks as measured in the disc-radial direction. Prepits for providing address information for the guide groove tracks are provided. The prepits are formed on the land regions and interposed between the lateral edges in the disc-radial direction of adjacent parallel guide groove tracks. Each prepit has a width which width is a narrower dimension than the width of each guide groove track as measured in the disc-radial direction.
摘要翻译： 光存储盘介质包含多个导槽轨道。 引导槽轨道彼此平行地布置，并且它们用于控制光束的位置。 在导向槽轨道之间具有比在径向方向上测量的引导槽轨道的宽度宽的区域。 提供了用于提供导槽轨道的地址信息的准备。 在凹槽区域上形成预凹坑，并且在相邻的平行引导槽轨道的盘径方向上插入横向边缘之间。 每个预凹坑具有宽度，该宽度比在径向方向上测量的每个引导槽轨道的宽度更窄。
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