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    • 5. 发明授权
    • Surge current protection circuit
    • 浪涌电流保护电路
    • US4091434A
    • 1978-05-23
    • US731766
    • 1976-10-12
    • Tadao SuzukiShigeaki Wachi
    • Tadao SuzukiShigeaki Wachi
    • G05F1/10G05F1/56H02H3/08H02H7/12H02H9/00H02H11/00H02M3/00H02M3/28H03F1/52H02H7/10
    • H03F1/52H02H11/006H02H3/08H02H7/12H02H9/005H02M3/00
    • A surge current protection circuit includes an input terminal supplied with a rectified alternating voltage, an output terminal to be connected to a load, and a semiconductor controlled rectifier having its anode and cathode electrodes connected in series between the input and output terminals. The collector and emitter electrodes of a control transistor are connected between the gate and cathode electrodes of the rectifier. The base-emitter voltage is supplied with any sharp transients, and the transistor becomes conductive before the rectifier if the transients are sharp enough and of high enough amplitude. Conduction of the transistor prevents the semiconductor controlled rectifier from conducting surge currents and protects circuits connected in series with the rectifier.
    • 浪涌电流保护电路包括提供有整流交流电压的输入端子,要连接到负载的输出端子以及其阳极和阴极电极串联连接在输入和输出端子之间的半导体可控整流器。 控制晶体管的集电极和发射极连接在整流器的栅极和阴极之间。 基极 - 发射极电压提供任何尖锐的瞬变,如果瞬变足够锐利且足够高的幅度,晶体管将在整流器之前导通。 晶体管的导通防止半导体可控整流器传导浪涌电流并保护与整流器串联连接的电路。
    • 7. 发明授权
    • Transistor inverter
    • 晶体管逆变器
    • US4031454A
    • 1977-06-21
    • US691827
    • 1976-06-01
    • Tadao SuzukiTadao YoshidaShigeaki Wachi
    • Tadao SuzukiTadao YoshidaShigeaki Wachi
    • H02M3/338H02M7/5383H02M7/5387H02M3/335
    • H02M3/3387
    • A transistor inverter includes a pair of switching transistors each having base, emitter and collector electrodes, each of the collector and emitter circuits of which is connected between a DC voltage source through a primary winding of an output transformer, respectively, the secondary winding of which is connected to a rectifying circuit so as to produce a DC output voltage at its output. The transistor inverter also includes an input transformer with a saturable core and voltage feedback and current feedback circuits. The current feedback circuit has another transformer which controls the amount of current feedback, and the winding ratio of the primary and secondary windings is determined in connection with the current amplification factor of said first and second switching transistors in order to improve a switching speed of the switching transistors.
    • 晶体管反相器包括一对开关晶体管,每个开关晶体管具有基极,发射极和集电极,其集电极和发射极各自分别通过输出变压器的初级绕组连接在直流电压源之间,其次级绕组 连接到整流电路,以在其输出端产生直流输出电压。 晶体管反相器还包括具有饱和磁芯和电压反馈和电流反馈电路的输入变压器。 电流反馈电路具有控制电流反馈量的另一个变压器,并且根据所述第一和第二开关晶体管的电流放大系数来确定初级绕组和次级绕组的绕组比,以便提高开关速度 开关晶体管。
    • 9. 发明授权
    • Optical recording medium and recording and/or reproducing apparatus
using such optical recording medium
    • 光记录介质和使用这种光记录介质的记录和/或再现设备
    • US5537374A
    • 1996-07-16
    • US416070
    • 1995-04-04
    • Shigeaki Wachi
    • Shigeaki Wachi
    • G11B7/007G11B7/085G11B7/09G11B7/095G11B7/24G11B11/105G11B7/00
    • G11B11/10578G11B7/0901G11B7/0938G11B7/094G11B7/24
    • An optical recording medium on which a data signal is formed comprises an area A of recording tracks for recording a data signal between pairs of grooves Gr and a d.c. offset cancel area B for canceling d.c. offset by the push-pull system, which serves as a predetermined area. In the d.c. offset cancel area B, no grove Gr is formed, and grooves are formed at the recording track center positions Tc. The groove at the recording track center position Tc is caused to have the same width and depth as those of the groove Gr. In carrying out recording/reproduction of a data signal by using this optical recording medium, a return light from the optical recording medium is detected by a bisected detector. A difference signal between outputs from the detector is determined by an amplifier. In accordance with an output signal of a sample-hold signal supply unit, first and second sample-hold units respectively hold signals having output phases different from each other by 180 degrees. An adder adds these signals to take out only a d.c. fluctuation component to eliminate the d.c. fluctuation component superimposed on a tracking error signal at a d.c. offset eliminating unit.
    • 其上形成有数据信号的光记录介质包括记录轨道的区域A,用于在成对的槽Gr和d.c.之间记录数据信号。 偏移取消区域B用于取消直流。 由作为预定区域的推挽系统偏移。 在d.c. 偏移抵消区域B,没有形成格子Gr,并且在记录轨道中心位置Tc处形成凹槽。 使记录轨道中心位置Tc处的槽具有与槽Gr相同的宽度和深度。 通过使用该光学记录介质进行数据信号的记录/再现,来自光记录介质的返回光由二等分检测器检测。 来自检测器的输出之间的差分信号由放大器确定。 根据采样保持信号供给单元的输出信号,第一采样保持单元和第二采样保持单元分别保持输出相位彼此相差180度的信号。 一个加法器加上这些信号,只取出一个直流电 波动成分消除直流。 波动分量叠加在跟踪误差信号上。 偏移消除单元。
    • 10. 发明授权
    • Seek control for information storage disc drive
    • 寻求信息存储磁盘驱动器的控制
    • US5471447A
    • 1995-11-28
    • US744966
    • 1991-08-14
    • Shigeaki Wachi
    • Shigeaki Wachi
    • G11B21/08G05D3/12G11B7/085G11B21/10G11B7/00G11B5/596
    • G11B7/08529G11B21/106
    • An optical pickup is controlled to move to a target track on an optical information storage disc based on target value information representing the sum of speed information indicative of a speed at which the optical pickup is to move, and distance information indicative of a distance which the optical pickup has moved toward the target track. A first subtractor produces a differential signal indicative of the difference between the target value information and remaining distance information which represents a remaining distance that the optical pickup is to move. The differential signal is supplied to a second subtractor which determines the difference between the differential signal and actual speed information indicating an actual speed at which the optical pick is moving. The second subtractor produces a differential signal which is supplied to an actuator to move the optical head.
    • 控制光拾取器基于表示表示光拾取器要移动的速度的速度信息的总和的目标值信息以及指示距离的距离信息指示光信息存储盘上的目标轨迹 光学拾取器朝向目标轨道移动。 第一减法器产生指示目标值信息与表示光学拾取器要移动的剩余距离的剩余距离信息之间的差异的差分信号。 差分信号被提供给第二减法器,该第二减法器确定差分信号与指示光拾取器移动的实际速度的实际速度信息之间的差。 第二减法器产生差分信号,该差分信号被提供给致动器以移动光学头。