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公开(公告)号：US5483394A
公开(公告)日：1996-01-09
申请号：US146369
申请日：1993-10-29
申请人： Jefferson H. Harman
发明人： Jefferson H. Harman
CPC分类号： G11B5/584
摘要： A track following positioning system including filtered average servo demodulators for maintaining the position of a magnetic tape head in alignment with tracks of data stored in magnetic medium. A servo head tracks a centerline in a servo written region of the magnetic medium and generates servo head signals corresponding to the displacement of the servo head from the centerline. A filtered average servo demodulator detects the servo head signals and generates servo error signals for realigning the tape head with respect to the magnetic medium in response thereto. To generate servo error signals, the filtered average servo demodulator peak detects and averages the rectified and filtered output signals and then subtracts a proportion of the peak detected signals from the average detected signals.
摘要翻译： 轨道跟踪定位系统包括滤波的平均伺服解调器，用于保持与磁介质中存储的数据的轨迹对准的磁带头的位置。 伺服磁头跟踪磁介质的伺服写入区域中的中心线，并产生对应于伺服磁头从中心线的位移的伺服磁头信号。 滤波后的平均伺服解调器检测伺服头信号，并产生伺服误差信号，用于响应于磁头重新对准磁头。 为了产生伺服误差信号，滤波后的平均伺服解调器峰值检测和平均整流和滤波的输出信号，然后从平均检测信号中减去一部分峰值检测信号。
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公开(公告)号：US4300174A
公开(公告)日：1981-11-10
申请号：US105894
申请日：1979-12-21
CPC分类号： G11B20/1252 , G11B5/012 , G11B5/59633 , G11B2020/10916
摘要： The tunnel-erase-type guard band "writing" along the tracks of a disk in a disk file is controlled by the same microcomputer which controls transducer repositioning in the seek mode. The micro-computer meters different delays for onset and cessation of erasing in relation to a signal (write gate) accompanying the data to be recorded; and these delays are longer for tracks having smaller diameters. The leading and trailing edges of the write gate signal trigger interrupts for the microcomputer, the interrupt channel is released only after the particular delay has been metered.
摘要翻译： 沿着磁盘文件中的盘的磁道的“写入”隧道擦除型保护带由在搜索模式中控制换能器重新定位的同一微型计算机控制。 微计算机对与要记录的数据相关的信号（写入门）相对于开始和停止擦除的延迟进行测量; 对于具有较小直径的轨道，这些延迟更长。 写入门信号的前沿和后沿触发微机的中断，只有在特定的延迟被计量之后，才会释放中断通道。
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公开(公告)号：US4270073A
公开(公告)日：1981-05-26
申请号：US16066
申请日：1979-02-28
申请人： Jefferson H. Harman
发明人： Jefferson H. Harman
IPC分类号： G11B5/55 , G05D23/275
CPC分类号： G11B5/553
摘要： A voice coil type linear motor controls the movement and positioning of a transducer which cooperates with a spinning disk. The motor is feedback controlled for separate speed (seek) and positioning modes in which respectively the transducer is moved across the disk towards a different track and is held centered above that track. In order to offset the effect of a tilted axis of carriage movement, the control condition in the positioning mode representing a correct transducer position in which it is held by the motor, is continuously sampled and held during a period when the transducer is moved to another track to be applied as correction for the control moving the transducer towards another track. This correction signal is also used in the initial phases of holding the transducer above the newly selected track, until sampling and positioning control proper takes over.
摘要翻译： 音圈式线性电机控制与旋转盘配合的换能器的运动和定位。 电动机反馈控制分开的速度（寻道）和定位模式，分别在这些模式下，传感器沿磁盘移动到不同的轨道，并保持在该轨道上方的中心位置。 为了抵消滑架运动的倾斜轴的影响，在换能器移动到另一个的时段期间，表示其由电动机保持的正确换能器位置的定位模式中的控制条件被连续采样和保持 将作为校正的轨道应用于将换能器移向另一轨道的控制。 该校正信号也用于将换能器保持在新选择的轨道上方的初始阶段，直到取样和定位控制正确接管为止。
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4.发明授权Automatic closed loop adjustment of analog read signals under microprocessor control 失效微处理器控制下模拟读取信号的自动闭环调节
公开(公告)号：US5383064A
公开(公告)日：1995-01-17
申请号：US46687
申请日：1993-04-13
申请人： Jefferson H. Harman
发明人： Jefferson H. Harman
CPC分类号： G11B5/09 , G11B20/182
摘要： A closed loop resolution enhancement technique for reducing density effects to permit increased digital data storage density on magnetic media and improve data reliability for at a given density, uses a predetermined test pattern written on the medium to determine the ratio of amplitudes of high and low frequency components of the test pattern and adjust a resolution value. After a test pattern read operation is used to adjust the resolution value, the same value is used during normal data recovery operations.
摘要翻译： 一种用于减小密度效应的闭环分辨率增强技术，以允许在给定密度下提高数字数据存储密度并提高数据可靠性，使用写在介质上的预定测试图案来确定高频和低频振幅的比率 组件的测试图案并调整分辨率值。 在使用测试模式读取操作来调整分辨率值后，在正常数据恢复操作期间使用相同的值。
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公开(公告)号：US5208523A
公开(公告)日：1993-05-04
申请号：US850331
申请日：1992-03-10
申请人： Jefferson H. Harman
发明人： Jefferson H. Harman
CPC分类号： G11B21/08 , G05B19/39 , G11B5/5508 , G11B5/584
摘要： A stepper motor in a magnetic tape cartridge head positioning system applies vernier control to achieve a final target after a preliminary target has been achieved by stepping. The vernier control is provided by a closed loop servo system in which current is applied to stator coils selected so that the target is at a torque maximum rather than at a torque null. Current proportional to a servo error signal is applied to selected stator coils so that the torque is sufficiently linearly related to position to permit classical linear servo analysis for the design of a stable, non-oscillating system. An example of stator coil selection for advancing and retarding a permanent magnet stepper motor operated in eight half steps is provided below in Table 1.
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公开(公告)号：US4306257A
公开(公告)日：1981-12-15
申请号：US105895
申请日：1979-12-21
申请人： Jefferson H. Harman
发明人： Jefferson H. Harman
CPC分类号： G11B5/012
摘要： The signal read-back from a magnetic disk is processed in dependance upon the track diameter in order to cut higher frequencies for outer tracks and to boost high frequencies for inner tracks for, respectively, correcting flat signal portions and eliminating or reducing peak displacement. The circuit develops a signal-amplitude-modifying factor in form of a cosine function of the frequencies of the read-back signal as applied. Two thus modified read-back signals are developed, varying oppositely in strength in dependance upon the track diameter. These two signals are combined to obtain the selective cutting or boosting as required.
摘要翻译： 根据磁道直径来读取从磁盘读回的信号，以便为外轨道切割较高的频率，并分别提高内部磁道的高频，以分别校正平面信号部分，消除或减少峰值位移。 电路以所应用的回读信号的频率的余弦函数的形式产生信号幅度修正因子。 两个如此修改的回读信号被显影，其强度根据轨道直径相反地变化。 将这两个信号组合以获得所需的选择性切割或升压。
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公开(公告)号：US4027217A
公开(公告)日：1977-05-31
申请号：US549333
申请日：1975-02-12
申请人： Jefferson H. Harman
发明人： Jefferson H. Harman
CPC分类号： H02P7/2885 , Y10S388/912 , Y10S388/933
摘要： The spindle motor for a flexible recording disk is connected to a disk with an annular track of optical markings which are scanned to derive therefrom a train of reset pulses for a counter counting higher frequency clock pulses. Reaching of a particular count state is ascertained for each reset cycle to obtain a train of pulses of constant duration with pauses inbetween, varying with motor speed. A steady signal linearly varying with motor speed is derived from that train, compared with a reference and used to controlthe motor.
摘要翻译： 用于柔性记录盘的主轴电机被连接到具有光学标记的环形轨道的盘上，所述光学标记的环形轨迹被扫描以从其中得到用于计数较高频率时钟脉冲的计数器的一系列复位脉冲。 确定每个复位周期的特定计数状态的达到以获得具有恒定持续时间的脉冲序列，其间随着电机速度而变化。 与参考相比，从该列车获得与电动机速度线性变化的稳定信号，并用于控制电动机。
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公开(公告)号：US07619476B2
公开(公告)日：2009-11-17
申请号：US11378029
申请日：2006-03-15
申请人： Jefferson H. Harman
发明人： Jefferson H. Harman
IPC分类号： H03F3/26
CPC分类号： H03F3/3069 , H03F1/30 , H03F1/301 , H03F1/307 , H03F1/308 , H03F3/301 , H03F3/3435
摘要： An amplifier biasing stage includes a transistor that provides a biasing signal for a complementary pair of field-effect transistors included in an output stage of an amplifier. The amplifier biasing stage also includes one resistive element connected to an emitter of the transistor, another resistive element connected to a base of the transistor, and still another resistive element connected to a collector of the transistor. The respective resistances of the resistive elements are selected to substantially match a voltage provided by the amplifier biasing stage to a gate-to-source voltage of the complementary pair of field-effect transistors. The resistances of the resistive elements are also selected to substantially match a temperature coefficient of the amplifier biasing stage to a temperature coefficient of the complimentary pair of field-effect transistors.
摘要翻译： 放大器偏置级包括提供用于放大器的输出级中包括的互补对的一对场效应晶体管的偏置信号的晶体管。 放大器偏置级还包括连接到晶体管的发射极的一个电阻元件，连接到晶体管的基极的另一个电阻元件，以及连接到晶体管的集电极的另一个电阻元件。 选择电阻元件的各自的电阻以将由放大器偏置级提供的电压基本上与互补对的场效应晶体管的栅极 - 源极电压匹配。 还选择电阻元件的电阻以将放大器偏置级的温度系数与互补对的场效应晶体管的温度系数基本一致。
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公开(公告)号：US5452153A
公开(公告)日：1995-09-19
申请号：US277118
申请日：1994-07-19
CPC分类号： G11B5/588
摘要： A magnetic recording head positioning system includes a Terfenol-D magnetostrictive rod prestressed by a lever arm to operate in a linear range to microposition the magnetic recording head in accordance with an electromagnetic field. The mechanical advantage of the lever arm amplifies changes in the magnetostrictive rod to position the head. The varying electromagnetic field is applied to the rod by a coil in response to a position error signal produced from servo data tracks on the magnetic tape. A permanent magnet system biases the magnetostrictive element with a DC field so that varying the field provides bi-directional motion of the magnetic recording head. The DC field also reduces coil current and size requirements. The position signal is filtered so that changes in length of the magnetostrictive rod provide fast, fine positioning of the head while a stepper motor and lead screw subassembly system provide slow, coarse positioning of the magnetic recording head by moving the magnetostrictive element assembly in an open loop and/or closed or servo loop mode.
摘要翻译： 磁记录头定位系统包括由杠杆臂预应力的Terfenol-D磁致伸缩杆，以在线性范围内操作，以根据电磁场对磁记录头进行微定位。 杠杆臂的机械优点放大了磁致伸缩杆的变化以定位头部。 响应于由磁带上的伺服数据轨道产生的位置误差信号，通过线圈将变化的电磁场施加到杆。 永磁体系统利用直流磁场对磁致伸缩元件进行偏置，从而改变磁场提供磁记录头的双向运动。 直流电场还可减少线圈电流和尺寸要求。 位置信号被过滤，使得磁致伸缩杆的长度变化提供了头部的快速，精细定位，而步进电机和丝杠组件系统通过将磁致伸缩元件组件移动开放来提供磁记录头的缓慢而粗略的定位 环路和/或闭合或伺服环路模式。
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公开(公告)号：US5386326A
公开(公告)日：1995-01-31
申请号：US23028
申请日：1993-02-25
申请人： Jefferson H. Harman
发明人： Jefferson H. Harman
摘要： An oscillating erase current circuit for erasing information recorded on magnetic media. The inductance of an erase head is coupled with capacitors to form a tank circuit having a natural resonant frequency. The self-oscillating erase current circuit generates an oscillating signal having a frequency of oscillation determined by and therefore equal to the natural resonant frequency of the tank circuit. Once enabled, the self-oscillating erase current circuit continuously oscillates without any external drive circuit.
摘要翻译： 用于擦除记录在磁性介质上的信息的振荡擦除电流电路。 擦除头的电感与电容器耦合以形成具有固有谐振频率的振荡电路。 自振荡擦除电流电路产生具有振荡频率的振荡信号，振荡频率由该振荡电路的固有谐振频率决定，因此等于振荡电路的固有谐振频率。 一旦使能，自振荡擦除电流电路在没有任何外部驱动电路的情况下连续振荡。
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