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76 条记录 (耗时 0.031 秒)

    Magnetic memory drive and optical device
    71.
    发明授权
    Magnetic memory drive and optical device 失效
    磁存储器驱动器和光学器件

    公开(公告)号：US06580580B1

    公开(公告)日：2003-06-17

    申请号：US09601359

    申请日：2000-08-01

    申请人： Hiroaki Kojima ,  Kou Shinomori

    发明人： Hiroaki Kojima ,  Kou Shinomori

    IPC分类号： G11B5596

    CPC分类号： G11B5/59677 ,  G11B7/09

    摘要： In a magnetic memory drive, a diffraction grating 16 receives a beam emitted by a light source 1 to generate three beams of 0th-order and ±1st-order light beams, and a condensing system 17 converges the beams on a magnetic recording medium 4. The beams reflected from the medium is received by a photodetector 15 which outputs signals corresponding to quantities of the received beams, and a signal processor 61 processes the signals to output a tracking error. The photodetector comprises a plurality of light-receiving sections. When crosstalk from a light-receiving section for the 0th-order beam to light-receiving sections for the ±1st-order beams is &egr; and crosstalk from the light-receiving sections for the ±1st-order beam to the light-receiving section for the 0th-order is &egr;′0 in the light-receiving sections of the photodetector, quantity of light Q0 of the 0th-order light beam and quantity of light Q±1 of the ±1st-order light beams has a relationship represented by a following equation: Q 0 ⁢ : ⁢ Q ± 1 = 2 × ϵ ′ ϵ ⁢ : ⁢ 1. Thus, the tracking error is reduced.

    摘要翻译： 在磁存储器驱动器中，衍射光栅16接收由光源1发射的光束，以产生0级和±1级光束的三束光，并且会聚系统17将光束会聚在磁记录介质4上。 从介质反射的光束由光电检测器15接收，光电检测器15输出对应于接收光束量的信号，信号处理器61处理信号以输出跟踪误差。 光检测器包括多个光接收部分。 当从0级光束的受光部到±1级光束的受光部的串扰是从±1级光束的光接收部到受光部的串扰为epsi， 在光检测器的光接收部分中的0阶是epsi'0，0级光束的光量Q0和±1级光束的光Q±1具有由 因此，跟踪误差降低。

    Frequency comparison circuit
    72.
    发明授权
    Frequency comparison circuit 有权
    频率比较电路

    公开(公告)号：US06580297B2

    公开(公告)日：2003-06-17

    申请号：US09734451

    申请日：2001-05-30

    申请人： Hiroaki Kojima

    发明人： Hiroaki Kojima

    IPC分类号： H03K906

    CPC分类号： H03D13/001

    摘要： The objective of the invention is to provide technology to give high-speed DVD RF signal reading. Frequency comparison circuit 1 of the present invention has edge spacing detection circuit 3, maximum spacing detection circuit 4, and minimum spacing detection circuit 5. The number of reference clock pulses in response to an RF signal pulse width (edge spacing) is detected by edge spacing detection circuit 3. The maximum value of the edge spacing in one frame, that is, the maximum edge spacing, is detected by maximum spacing detection circuit 4. The minimum value of the maximum edge spacing in multiple frames is detected by minimum spacing detection circuit 5. The maximum edge spacing minimum value is compared with a number that indicates the frame synchronizing signal period to perform frequency comparison. Edge spacing detection circuit 3, maximum spacing detection circuit 4, and minimum spacing detection circuit 5 are each constituted with registers. Frequency comparison is thus possible without using slow-speed comparators or counters, so that the operating speed can be increased compared with circuits of the prior art that use such comparators and counters.

    摘要翻译： 本发明的目的是提供提供高速DVD RF信号读取的技术。本发明的频率比较电路1具有边缘间隔检测电路3，最大间隔检测电路4和最小间隔检测电路5.数量 通过边缘间隔检测电路3检测响应于RF信号脉冲宽度（边缘间隔）的参考时钟脉冲。一个帧中的边缘间隔的最大值，即最大边缘间隔，由最大间隔检测电路 通过最小间隔检测电路5检测多个帧中的最大边缘间隔的最小值。将最大边缘间隔最小值与指示帧同步信号周期的数字进行比较以执行频率比较。 边缘间隔检测电路3，最大间隔检测电路4和最小间隔检测电路5均由寄存器构成。 因此，在不使用慢速比较器或计数器的情况下，可以进行频率比较，从而与使用这种比较器和计数器的现有技术的电路相比，可以提高工作速度。

    Process for preparing a propylene-tetrafluoroethylene copolymer
    75.
    发明授权
    Process for preparing a propylene-tetrafluoroethylene copolymer 失效
    制备丙烯 - 四氟乙烯共聚物的方法

    公开(公告)号：US4277586A

    公开(公告)日：1981-07-07

    申请号：US763136

    申请日：1977-01-27

    申请人： Hiroshi Ukihashi ,  Masaaki Yamabe ,  Hiroaki Kojima

    发明人： Hiroshi Ukihashi ,  Masaaki Yamabe ,  Hiroaki Kojima

    IPC分类号： C08F2/26 ,  C08F210/06 ,  C08F214/26

    CPC分类号： C08F214/265 ,  C08F210/06

    摘要： Propylene and tetrafluoroethylene are copolymerized at the low temperature of 0.degree.-50.degree. C. in an aqueous medium in the presence of a specific redox catalyst system. The specific redox catalyst system comprises (1) a water soluble inorganic persulfate, (2) a water soluble thiosulfate or bisulfite and (3) a water soluble iron salt, and preferably further comprises a reducing sugar and a water soluble pyrophosphate. The propylene-tetrafluoroethylene copolymer having high molecular weight and low Mooney viscosity can be prepared at high copolymerization reaction rates.

    摘要翻译： 丙烯和四氟乙烯在0℃-50℃的低温下，在特定的氧化还原催化剂体系的存在下，在含水介质中共聚。 特定的氧化还原催化剂体系包括（1）水溶性无机过硫酸盐，（2）水溶性硫代硫酸盐或亚硫酸氢盐和（3）水溶性铁盐，并且优选还包含还原糖和水溶性焦磷酸盐。 具有高分子量和低门尼粘度的丙烯 - 四氟乙烯共聚物可以以高共聚反应速率制备。