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    • 4. 发明授权
    • Helical scan tracking system
    • 螺旋扫描跟踪系统
    • US4945426A
    • 1990-07-31
    • US200373
    • 1988-05-31
    • Hiroshi OkamotoSouichirou Fujioka
    • Hiroshi OkamotoSouichirou Fujioka
    • G11B15/18G11B15/467G11B15/60
    • G11B15/467G11B15/1808G11B15/602
    • A tracking system for a helical scanning type magnetic recording/reproducing apparatus which records and reproduces signals by a rotating magnetic head in which a tracking error signal is detected, and the feeding amount of the magnetic tape is controlled by a transfer section to accomplish tracking. The transfer of the magnetic tape is controlled so that the average transfer speed of the magnetic tape becomes a specified speed during a period when the rotating magnetic head does not reproduce signals. In particular, the tracking error signal is separated into low band and high band frequency components by a band separating circuit. A first transfer section is controlled by the low band frequency component to accomplish average tracking, and a second transfer section is controlled by the high band frequency component thereby changing the length of the magnetic tape between the rotating drum and the first transfer section. At the same time, while the rotating magnetic head does not reproduce signals, the second transfer section is controlled so that the tracking error signal becomes zero during the initial stage when the rotating magnetic head scans over the recorded track thereby to accomplish more stable tracking.
    • 螺旋扫描型磁记录/再现装置的跟踪系统,其通过检测到跟踪误差信号的旋转磁头记录和再现信号,并且由传送部分控制磁带的馈送量以完成跟踪。 控制磁带的传送,使得在旋转磁头不再现信号的期间磁带的平均传送速度变为规定的速度。 特别地,通过频带分离电路将跟踪误差信号分离成低频带和高频带分量。 第一传送部分由低频带频率分量控制以实现平均跟踪,并且第二传送部分由高频带频率分量控制,从而改变旋转鼓和第一传送部分之间的磁带的长度。 同时,当旋转磁头不再现信号时,控制第二传送部分,使得在旋转磁头扫描记录轨道的初始阶段,跟踪误差信号变为零,从而实现更稳定的跟踪。
    • 6. 发明授权
    • Brushless DC motor
    • 无刷直流电机
    • US4631459A
    • 1986-12-23
    • US804253
    • 1985-12-03
    • Souichirou FujiokaToshio InajiSusumu Yamamoto
    • Souichirou FujiokaToshio InajiSusumu Yamamoto
    • H02P6/08H02P6/16H02P6/20H02P6/02
    • H02P6/16H02P6/21
    • A brushless DC motor which can be started positively by using a single position detecting element. The motor has a starting circuit which forcibly energizes the stator coils thereby to start rotating the rotor. The position detecting element produces n position signals corresponding to n positions of the rotor at which a specific stator coil is to be energized. When the position detecting element produces one of the n position signals, the motor begins to energize the stator coils according to position signals obtained from counter electromotive forces generated in the stator coils. Further, one of the n position signals produced by the position detecting element is made different from the other, a reference position signal can be obtained.
    • 通过使用单个位置检测元件能够正面启动的无刷直流电动机。 电动机具有启动电路,强制使定子线圈通电,从而开始转动转子。 位置检测元件产生对应于特定定子线圈通电的转子的n个位置的n个位置信号。 当位置检测元件产生n个位置信号中的一个时,电动机根据从定子线圈中产生的反电动势获得的位置信号开始给定子线圈通电。 此外,由位置检测元件产生的n个位置信号中的一个与另一个不同,可以获得基准位置信号。