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77 条记录 (耗时 0.029 秒)

    Light modulation method for forming a mark in magneto-optical recording system
    71.
    发明授权
    Light modulation method for forming a mark in magneto-optical recording system 失效
    用于在磁光记录系统中形成标记的光调制方法

    公开(公告)号：US5457666A

    公开(公告)日：1995-10-10

    申请号：US114062

    申请日：1993-08-31

    申请人： Tsuyoshi Toda ,  Hiroshi Ide ,  Fumiyoshi Kirino ,  Takeshi Maeda ,  Hiroyuki Tsuchinaga ,  Toshimitsu Kaku ,  Seiichi Mita ,  Kazuo Shigematsu

    发明人： Tsuyoshi Toda ,  Hiroshi Ide ,  Fumiyoshi Kirino ,  Takeshi Maeda ,  Hiroyuki Tsuchinaga ,  Toshimitsu Kaku ,  Seiichi Mita ,  Kazuo Shigematsu

    IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/0055 ,  G11B7/006 ,  G11B7/125 ,  G11B11/10 ,  G11B11/105 ,  G11B7/24

    CPC分类号： G11B7/126 ,  G11B11/10506 ,  G11B11/1053 ,  G11B7/0045 ,  G11B7/006

    摘要： A magneto-optical disk recording control method using the mark length recording method wherein the marks and gap regions between marks are recorded on the surface of the disk by maintaining a constant temperature distribution during the recording. The laser is driven to a non-recording level in gap regions between marks that exceed a base recording level used for reproduction of the marks. When a mark is recorded, the laser power is increased to a recording power level and after the mark has been recorded, the laser power level is reduced to the base power level, followed by being raised to the gap recording level. Control of the laser is performed by superposing a plurality of pulse trains that are synchronized with respect to a clock having a cycle T. The pulse trains are derived from the code train to be recorded and have pulses with a duration that is an integral multiple of (1/2)T. If the pulse width of the recording code train exceeds 2T, then the laser is controlled to reach a first power level in accordance with pulses of a first pulse train, be reduced to the gap recording level and then raised to a second power level in accordance with a second recording pulse train to maintain the temperature distribution constant during the recording of the mark. For the recording of longer marks, the laser is controlled to vary between the second power level and the gap recording level.

    摘要翻译： 一种使用标记长度记录方法的磁光盘记录控制方法，其中通过在记录期间保持恒定的温度分布将标记之间的标记和间隙区域记录在盘的表面上。 在超过用于再现标记的基本记录水平的标记之间的间隙区域中激光被驱动到非记录水平。 当记录标记时，激光功率增加到记录功率水平，并且在记录标记之后，激光功率水平降低到基本功率水平，然后升高到间隙记录水平。 通过叠加相对于具有周期T的时钟同步的多个脉冲串来执行激光的控制。脉冲序列是从要被记录的代码序列导出的，具有持续时间为整数倍的脉冲 （1/2）T。 如果记录代码串的脉冲宽度超过2T，则根据第一脉冲序列的脉冲将激光器控制到达到第一功率电平，减小到间隙记录电平，然后依次升高到第二功率电平 具有第二记录脉冲串，以在记录记录期间保持温度分布恒定。 为了记录更长的标记，激光器被控制在第二功率电平和间隙记录电平之间变化。

    Information reproducing apparatus with a DC level correcting capability
    72.
    发明授权
    Information reproducing apparatus with a DC level correcting capability 失效
    具有DC电平校正功能的信息再现装置

    公开(公告)号：US5412632A

    公开(公告)日：1995-05-02

    申请号：US28224

    申请日：1993-03-09

    申请人： Seiichi Mita ,  Toru Kawashima ,  Toshimitsu Kaku

    发明人： Seiichi Mita ,  Toru Kawashima ,  Toshimitsu Kaku

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

    CPC分类号： G11B11/10597 ,  G11B20/10009

    摘要： A signal reproducing system discriminates signals stably in the case of reproducing a signal from an optical recording medium which has coexistent recording areas with the signals recorded in different recording forms therein. Parts that constitute a reproduced signal are respectively derived by corresponding signal detectors from the optical recording medium in which a preformat area and a data area are included as the coexistent recording areas. The average potentials of VFO parts, which are respectively contained in the reproduced signal parts, are detected on the basis of the envelopes of the signal parts by a peak detecting circuit and a bottom detecting circuit. The detected average potentials are compared with a reference voltage, and the resulting difference potentials are added to the reproduced signal by an adder to bring the average potentials of the VFO parts into agreement. Further, an unwanted part of the output signal of the adder corresponding thereto is replaced by a switch with the output signal of a signal generator, which has an average potential equal to the average potential of the VFO parts brought into agreement.

    摘要翻译： 信号再现系统在再现来自具有记录在不同记录形式的信号的具有共存记录区域的光记录介质的信号的情况下，稳定地鉴别信号。 构成再现信号的部件分别由来自其中包括预格式区域和数据区域的光记录介质的相应信号检测器导出为共存记录区域。 基于由峰值检测电路和底部检测电路的信号部分的包络来检测分别包含在再现信号部分中的VFO部分的平均电位。 将检测到的平均电位与参考电压进行比较，并通过加法器将所得差分电位加到再现信号上，使VFO部分的平均电位一致。 此外，与其对应的加法器的输出信号的不希望的部分由具有信号发生器的输出信号的开关代替，该信号发生器具有等于VFO部分的平均电位的平均电位。

    Apparatus for optical disc memory with correction pattern and master disc cutting apparatus
    75.
    发明授权
    Apparatus for optical disc memory with correction pattern and master disc cutting apparatus 失效
    具有校正图案和主光盘切割设备的光盘存储器的设备

    公开(公告)号：US5084860A

    公开(公告)日：1992-01-28

    申请号：US551025

    申请日：1990-07-11

    申请人： Takeshi Maeda ,  Yoshito Tsunoda ,  Kazuo Shigematsu ,  Toshimitsu Kaku

    发明人： Takeshi Maeda ,  Yoshito Tsunoda ,  Kazuo Shigematsu ,  Toshimitsu Kaku

    IPC分类号： G11B7/007 ,  G11B7/09 ,  G11B7/26 ,  G11B11/105

    CPC分类号： G11B7/261 ,  G11B11/10565 ,  G11B11/10578 ,  G11B11/10582 ,  G11B7/0901 ,  G11B7/0938 ,  G11B7/094 ,  G11B7/24082

    摘要： A record carrier having a disc-shaped substrate and a recording layer for optically writing information therein is disclosed which includes a guide groove extended in the rotational direction of the record carrier so that a plurality of revolutions of the guide groove are spaced apart from each other in radial directions of the record carrier, and a pit pattern provided between adjacent guide grooves, at positions arranged at intervals in the above rotational direction, for detecting the deviation of a light spot from the center line between adjacent guide grooves. The recording/reproducing operation for this record carrier is performed in such a manner that the first tracking error signal is detected from diffracted light from the guide groove, the second tracking error signal is detected from the pit pattern, and information is recorded in and reproduced from a land formed between adjacent guide grooves in a state that a tracking operation is performed using the first and second tracking error signals. The second tracking error signal detected from the pit pattern is not affected by the tilting of the record carrier and the movement of the light spot. When a tracking signal obtained by adding the first and second tracking error signals to each other, is used in a closed-loop tracking system, a stable tracking operation can be performed. The polarity of the pit pattern is reversed on every track, and hence a polarity pit having a depth of .lambda./4 (where .lambda. indicates the wavelength of a reproducing light beam) is provided in the record carrier, to reverse the polarity of the second tracking signal on every track on the basis of a signal from the polarity pit.