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    • 34. 发明授权
    • Apparatus and method of reproducing synchronization signal in disc
storage system
    • 在盘存储系统中再现同步信号的装置和方法
    • US5724204A
    • 1998-03-03
    • US237404
    • 1994-05-02
    • Tohru ShinoharaShuichi Hashimoto
    • Tohru ShinoharaShuichi Hashimoto
    • G11B20/10G11B5/55G11B5/596G11B19/04G11B20/00G11B20/14G11B21/08
    • G11B21/083G11B19/04G11B5/5526G11B5/5547G11B5/59616
    • An apparatus and a method of reproducing a synchronization signal in a disc storage system. The apparatus includes disc mechanism having a plurality of information storage discs in one of which a predetermined servo pattern is recorded, and a corresponding plurality of reproducing heads, one of the heads reading the servo pattern from the corresponding disc to thereby output a servo signal, a synchronization signal demodulating unit, responsive to the servo signal from the disc mechanism, for demodulating a synchronization signal in synchronization with a rotation of the discs, a synchronization clock generating unit for generating a clock signal with a predetermined frequency in synchronization with the synchronization signal, and a gate unit. For a predetermined period, the gate unit prohibits a supply of the synchronization signal from the synchronization signal demodulating unit to the synchronization clock generating unit. As a result, it is possible to prevent an erroneous detection of a synchronization signal due to a spike noise, an undesirable signal by a defect of a medium, or the like, and thus realize a precise reproducing of the synchronization signal.
    • 一种在盘存储系统中再现同步信号的装置和方法。 该装置包括具有多个信息存储盘的盘机构,其中一个记录有预定的伺服模式,以及相应的多个再现头,其中一个读头从对应的盘读取伺服模式,从而输出伺服信号, 同步信号解调单元,响应于来自盘机构的伺服信号,用于与盘的旋转同步地解调同步信号;同步时钟产生单元,用于与同步信号同步地产生具有预定频率的时钟信号 ,以及门单元。 在预定时间段内,门单元禁止从同步信号解调单元向同步时钟发生单元提供同步信号。 结果,可以防止由于尖峰噪声引起的同步信号的错误检测,由于介质的缺陷导致的不期望的信号等,从而实现了同步信号的精确再现。
    • 37. 发明授权
    • Track access control system preventing unintentional delay in movement
of head in non-adjusted disc device
    • 跟踪访问控制系统防止头部在非调节光盘设备中的移动的意外延迟
    • US5231550A
    • 1993-07-27
    • US667164
    • 1991-03-11
    • Shuichi Hashimoto
    • Shuichi Hashimoto
    • G11B5/55G11B19/20
    • G11B19/20G11B5/5547
    • A track access control system which is used in a rotating disc device, for positioning a servo head above a desired track by speed control and then position control. A timer starts when the head reaches a predetermined position which is out of a predetermined vicinity of the desired track, and when in the vicinity, the control is switched from the speed control to the position control. After a predetermined time has elapsed after the head reaches the predetermined position, the target speed is increased to push the head. Alternatively, after the predetermined time has elapsed after the head reaches the predetermined position, the control may be immediately switched from the speed control to the position control. In addition, in a return-to-zero operation, intervals between times the servo head passes over different tracks are monitored to detect a real speed of the head, and the target speed during the speed control is controlled according to the detected real speed.
    • 一种轨道存取控制系统,其用于旋转盘装置中,用于通过速度控制然后进行位置控制将伺服头定位在期望轨道上方。 当头部到达预期的轨迹预定附近的预定位置时,定时器开始,并且在附近,控制从速度控制切换到位置控制。 在头部到达预定位置经过预定时间之后,目标速度增加以推动头部。 或者,在头到达预定位置经过预定时间之后,可以立即将控制从速度控制切换到位置控制。 此外,在归零操作中,监视伺服头经过不同轨道的间隔,以检测头的实际速度,并且根据检测到的实际速度来控制速度控制期间的目标速度。
    • 38. 发明授权
    • Servo circuit control method and system
    • 伺服电路控制方法与系统
    • US5194798A
    • 1993-03-16
    • US460668
    • 1990-01-03
    • Shuichi HashimotoTohru Shinohara
    • Shuichi HashimotoTohru Shinohara
    • G11B5/55G11B7/085G11B21/08
    • G11B7/08535G11B21/085G11B5/5547
    • A control system for a servo circuit has a speed control unit for controlling the speed of a servo object, a position control unit for controlling the position of the servo object, a switching unit for switching between the speed control unit and the position control unit, a main control unit, and optionally a speed zero detection circuit which compares the real speed and a slice level and detects if the real speed is less than a fixed value. The control system includes a method for producing a target speed using an amount of movement X in an amount of movement d as a remaining amount of movement, and producing a target speed of equal speed for a remaining amount of movement Y. Another method includes controlling the switching of position control of the servo circuit, determining if the conditions for switching to position control are met during speed control, monitoring conditions for switching for a fixed time X after detection of the switching conditions, switching position control when the switching conditions are met for the fixed time X, and returning to determine the switching conditions in accordance with the collapse of switching conditions within the fixed time. An additional method includes outputting a target speed using an amount of movement X as a remaining amount of movement, outputting a target speed of an equal speed of a remaining amount of movement Y, and switching the value of the slice level during the start of movement and after the movement.