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1. 发明授权

US06791781B2 Method and apparatus for providing linear position (LPOS) estimations 失效
标题翻译：用于提供线性位置（LPOS）估计的方法和装置
公开(公告)号：US06791781B2
公开(公告)日：2004-09-14
申请号：US09907307
申请日：2001-07-17
申请人： Nhan X. Bui , John Alexander Koski , Akimitsu Sasaki , Keisuke Tanaka , Kazuhiro Tsuruta
发明人： Nhan X. Bui , John Alexander Koski , Akimitsu Sasaki , Keisuke Tanaka , Kazuhiro Tsuruta
IPC分类号： G11B1518
CPC分类号： G11B5/584 , G11B15/46 , G11B15/52 , G11B15/54
摘要： A method and apparatus for providing linear position (LPOS) estimations. If valid LPOS data may be detected from the tape, then a first method for LPOS estimation is performed using the Hall effect sensors. If valid LPOS data may not be detected from the tape, then an error recovery procedure (ERP) is invoked so that a second method for LPOS estimation is used to provide accurate LPOS information which is synchronized to a validly detected LPOS from tape within about 1 meter prior to the desired data record.
摘要翻译：一种用于提供线性位置（LPOS）估计的方法和装置。如果可以从磁带检测到有效的LPOS数据，则使用霍尔效应传感器执行用于LPOS估计的第一种方法。如果从磁带无法检测到有效的LPOS数据，则调用错误恢复过程（ERP），以便使用LPOS估计的第二种方法来提供准确的LPOS信息，该LPOS信息与大约1的磁带中的有效检测到的LPOS同步在所需数据记录之前。

2. 发明授权

US06762900B2 Method and apparatus for performing position error signal conditioning of LTO media servo format written-in velocity variation 失效
标题翻译：用于执行LTO介质伺服格式写入速度变化的位置误差信号调理的方法和装置
公开(公告)号：US06762900B2
公开(公告)日：2004-07-13
申请号：US09907165
申请日：2001-07-17
申请人： Nhan X. Bui , John Alexander Koski , Akimitsu Sasaki , Kazuhiro Tsuruta
发明人： Nhan X. Bui , John Alexander Koski , Akimitsu Sasaki , Kazuhiro Tsuruta
IPC分类号： G11B5584
CPC分类号： G11B15/52 , G11B15/46
摘要： A method and apparatus for performing position error signal conditioning of LTO media servo format written-in velocity variation is disclosed. According to the present invention only the signals demonstrating velocity deviations are filtered. A magnetic recording tape includes servo signal bursts of flux transitions recorded thereon. The servo bursts include a configuration of stripes of A spacings and B spacings and a servo head disposed proximate to the magnetic recording tape senses the flux transitions of the servo signal bursts. A servo controller, coupled to the servo head, receives the sensed signals from the servo head. The servo controller further includes a filter for filtering the B time interval servo signal components. Then a position error signal according to: PES=ref−A/(B filtered), wherein A represents unfiltered A time interval servo components and B filtered is filtered B time interval servo components.
摘要翻译：公开了一种用于执行LTO介质伺服格式写入速度变化的位置误差信号调节的方法和装置。根据本发明，只有显示速度偏差的信号被过滤。磁记录带包括其上记录的磁通转变的伺服信号脉冲串。伺服脉冲串包括A间隔和B间隔的条纹的配置，并且靠近磁记录带设置的伺服磁头检测伺服信号脉冲串的磁通转变。耦合到伺服头的伺服控制器从伺服头接收感测到的信号。伺服控制器还包括用于对B时间间隔伺服信号分量进行滤波的滤波器。然后根据以下的位置误差信号：其中A表示未过滤的A时间间隔伺服分量，B滤波后的B时间间隔伺服分量。

3. 发明授权

US06587303B1 Servo control of a coarse actuator 有权
标题翻译：伺服控制粗动执行器
公开(公告)号：US06587303B1
公开(公告)日：2003-07-01
申请号：US09590673
申请日：2000-06-09
申请人： Nhan Xuan Bui , John Alexander Koski , Akimitsu Sasaki , Kazuhiro Tsuruta
发明人： Nhan Xuan Bui , John Alexander Koski , Akimitsu Sasaki , Kazuhiro Tsuruta
IPC分类号： G11B5596
CPC分类号： G11B5/584
摘要： A servo system and method position a head laterally with respect to defined servo tracks, employing fine and coarse actuators. A servo control integrates the position error between the head and a desired position in accordance with a predetermined function, and operates the coarse actuator to translate the fine actuator and the head in accordance with the integrated position error. A position error signal loop is coupled to a servo sensor for determining position error for operating the fine actuator to translate the head in a manner to reduce the position error. The position error signal loop may have a compensator function with both integration and other functions. A coarse servo control comprises a connection coupled to the compensator function for providing an integration control representing the integration function of the position error signal loop; and a driver coupled to the connection, operating the coarse actuator to translate the fine actuator and the head in accordance with the integration signal.
摘要翻译：伺服系统和方法相对于限定的伺服轨道横向定位头部，采用精细和粗略的致动器。伺服控制器根据预定的功能将头部和期望位置之间的位置误差进行积分，并且根据积分位置误差操作粗略致动器来平移精细致动器和头部。位置误差信号回路耦合到伺服传感器，用于确定用于操作精细致动器的位置误差，以便以降低位置误差的方式平移头部。位置误差信号回路可以具有补偿器功能，具有集成和其他功能。粗伺服控制包括耦合到补偿器功能的连接，用于提供表示位置误差信号回路的积分功能的积分控制; 以及耦合到所述连接的驱动器，操作所述粗略致动器以根据所述积分信号平移所述精细致动器和所述头部。

4. 发明授权

US06622113B2 Method and apparatus for detecting and computing tape reel radius using low-resolution angular position sensors 有权
标题翻译：使用低分辨率角度位置传感器检测和计算磁带卷轴半径的方法和装置
公开(公告)号：US06622113B2
公开(公告)日：2003-09-16
申请号：US09886298
申请日：2001-06-21
申请人： John Alexander Koski , Akimitsu Sasaki
发明人： John Alexander Koski , Akimitsu Sasaki
IPC分类号： G01C07100
CPC分类号： G01B5/02 , B65H2511/142 , B65H2553/51 , G01B21/02 , G11B15/46 , G11B15/52 , G11B27/13 , G11B2220/90 , G11B2220/95
摘要： A method and apparatus for detecting and computing tape reel radius using low-resolution angular position sensors is disclosed. Tape reels are driven at a constant velocity, a complete resolution of the tape reels is detected using coarse commutation sensors and a radius for a first reel, R1, and a radius for a second reel, R2 is calculated according to: R1=((L*T/pi)/(1+T22/T12))0.5 and R2=((L*T/pi)/(1+T12/T22))0.5, where L is the total length of tape, T is the thickness of tape, T1 is the rotation time for reel 1, and T2 is the rotation time for reel 2. The calculation of the radius of the two reels using two low resolution (one pulse per turn) sensors results in a great cost and product packaging savings.
摘要翻译：公开了一种使用低分辨率角度位置传感器检测和计算磁带卷轴半径的方法和装置。磁带盘以恒定速度驱动，使用粗换向传感器检测磁带卷的完整分辨率，第一卷轴的半径R1和第二卷轴的半径R2根据下式计算：其中L为磁带的总长度，T是磁带的厚度，T1是卷轴1的旋转时间，T2是卷轴2的旋转时间。使用两个低分辨率（每转一个脉冲）的两个卷轴的半径计算，传感器节省了巨大的成本和产品包装。

5. 发明授权

US06963467B2 Method and apparatus for compensating for media shift due to tape guide 失效
标题翻译：用于补偿由磁带引导引起的介质位移的方法和装置
公开(公告)号：US06963467B2
公开(公告)日：2005-11-08
申请号：US09907306
申请日：2001-07-17
申请人： Nhan X. Bui , John Alexander Koski , Akimitsu Sasaki , Kazuhiro Tsuruta
发明人： Nhan X. Bui , John Alexander Koski , Akimitsu Sasaki , Kazuhiro Tsuruta
IPC分类号： G11B5/584 , G11B15/48 , G11B15/60 , G11B17/00
CPC分类号： G11B5/584
摘要： A method and apparatus for compensating for media shift due to spiral groove roller tape guide is disclosed. The lateral tape shift is measured. Then the control of the coarse actuator is adjusted for the lateral tape shift so that the movement of the coarse actuator follows the tape shift.
摘要翻译：公开了一种用于补偿由于螺旋槽辊带引导引起的介质偏移的方法和装置。测量横向胶带位移。然后调整粗调机构的控制，使其侧向带位移，使得粗执行器的移动跟随磁带位移。

6. 发明授权

US06721126B1 Position identification for a coarse actuator portion of a compound actuator 失效
标题翻译：复合致动器的粗致动器部分的位置识别
公开(公告)号：US06721126B1
公开(公告)日：2004-04-13
申请号：US09641135
申请日：2000-08-16
申请人： Nhan Xuan Bui , John Alexander Koski , Akimitsu Sasaki , Kazuhiro Tsuruta
发明人： Nhan Xuan Bui , John Alexander Koski , Akimitsu Sasaki , Kazuhiro Tsuruta
IPC分类号： G11B5584
CPC分类号： G11B5/584 , G11B5/5508 , G11B21/088 , G11B21/103
摘要： A method and position control for a servo system for positioning a head laterally with respect to defined servo tracks. The servo system comprises a servo sensor and detector for sensing lateral position of the head and a compound actuator having a fine actuator portion and a coarse actuator portion. The position control provides position indications for the coarse actuator portion, which may comprise a table relating predetermined nominal lateral position indications to the defined servo tracks. The position control positions the coarse actuator portion at an estimated position with respect to the defined servo tracks, and responds to the servo sensor to determine which servo track is closest to the estimated position. The position control sets the coarse actuator portion position indication to the predetermined nominal lateral position indication of the closest defined servo track, e.g., by looking it up in the table. This thereby corrects the indication of the position of the coarse actuator portion.
摘要翻译：一种用于伺服系统的方法和位置控制，用于相对于限定的伺服轨道横向地定位头部。伺服系统包括用于感测头部的横向位置的伺服传感器和检测器以及具有精细致动器部分和粗略致动器部分的复合致动器。位置控制提供了粗略致动器部分的位置指示，该粗略致动器部分可以包括将预定的标称横向位置指示与定义的伺服轨迹相关联的工作台。位置控制将粗略致动器部分定位在相对于所定义的伺服轨道的估计位置处，并且响应伺服传感器以确定哪个伺服轨道最接近估计位置。位置控制将粗略的致动器部分位置指示设置为最接近的定义的伺服轨道的预定的标称横向位置指示，例如通过在表中查找。由此校正了粗略的致动器部分的位置的指示。

7. 发明授权

US06580581B1 Recovery of lateral position of a servo system with respect to longitudinal servo bands of a magnetic tape 有权
标题翻译：恢复伺服系统相对于磁带的纵向伺服带的横向位置
公开(公告)号：US06580581B1
公开(公告)日：2003-06-17
申请号：US09639076
申请日：2000-08-16
申请人： Nhan Xuan Bui , John Alexander Koski , Akimitsu Sasaki , Kazuhiro Tsuruta
发明人： Nhan Xuan Bui , John Alexander Koski , Akimitsu Sasaki , Kazuhiro Tsuruta
IPC分类号： G11B5584
CPC分类号： G11B5/584
摘要： A servo system and method position a head laterally with respect to magnetic tape longitudinal defined servo bands arranged in a longitudinally shifted pattern for identification, and separated by data tracks. A servo controller responds to a loss of lateral position, sensing an estimated longitudinal position of the magnetic tape. If the estimated longitudinal position is within a predetermined distance of an end of the tape, the servo controller operates a drive to continuously move the tape away from the sensed end. The servo controller senses a home lateral position sensor to determine whether a compound actuator is within a predetermined distance of the edge of the magnetic tape. If so, it operates the coarse actuator portion of the compound actuator to move laterally away from the edge of the magnetic tape; else, to move toward the edge. The servo controller senses a dual servo sensor to detect any two of the defined servo bands; and, upon sensing any two of the defined servo bands, detects the longitudinal shift to identify which ones of the two defined servo bands have been detected.
摘要翻译：伺服系统和方法相对于以纵向移位的图案布置的磁带纵向限定的伺服带横向地定位头部，用于识别，并由数据轨道分隔。伺服控制器响应横向位置的损失，感测估计的磁带的纵向位置。如果估计的纵向位置在带的端部的预定距离之内，则伺服控制器操作驱动器以使带远离感测的端部移动。伺服控制器感测家用横向位置传感器以确定复合致动器是否在磁带的边缘的预定距离内。如果是这样，它操作复合致动器的粗略的致动器部分横向移动离开磁带的边缘; 否则，走向边缘。伺服控制器检测双伺服传感器来检测任何两个定义的伺服带; 并且在感测到所定义的伺服带中的任何两个时，检测纵向偏移以识别已经检测出两个所定义的伺服带中的哪一个。

8. 发明授权

US06344720B1 Current mode PWM technique for a brushless motor 有权
标题翻译：无刷电机的电流模式PWM技术
公开(公告)号：US06344720B1
公开(公告)日：2002-02-05
申请号：US09429674
申请日：1999-10-28
申请人： John Alexander Koski , Nhan Bui
发明人： John Alexander Koski , Nhan Bui
IPC分类号： H02P608
CPC分类号： H02P6/085 , H02P6/14
摘要： A current mode pulse width modulation (PWM) technique for brushless motors. The present system and method controls a brushless motor by increasing or decreasing motor speed respectively according to the polarity and value of a pulse width modulation (PWM) control signal. The PWM signal varies according to an error signal generated in proportion to the difference between a desired motor current and an actual motor current. A motor current sensor is used to sense an actual motor current being applied to the motor. A current comparator is used to compare the current desired reference signal and the actual current signal and to generate an error signal. A pulse width modulator is used to convert the error signal to a pulse-width modulated error signal. Armature position sensors are used for sensing armature positions of the motor. A commutator circuit receives the pulse-width modulated error signal and the armature positions of the motor. Power switches are coupled to outputs of the commutator and also coupled to the motor. The commutator controls activation and deactivation of the respective power switches based on the corresponding pulse-width modulated error signal to control the motor at a desired motor current that corresponds to the desired reference current signal. The commutator controls the respective power switches to drive the motor in either a more positive, a more negative direction, or in the same manner to respectively increase, decrease, or maintain the motor speed when the error signal correspondingly has a generally positive, negative, or zero value.
摘要翻译：无刷电机的电流模式脉宽调制（PWM）技术。本系统和方法通过根据脉宽调制（PWM）控制信号的极性和值分别增加或降低电动机速度来控制无刷电动机。 PWM信号根据与期望的电动机电流和实际电动机电流之间的差成比例地生成的误差信号而变化。电动机电流传感器用于感测施加到电动机的实际电动机电流。电流比较器用于比较当前所需的参考信号和实际电流信号，并产生误差信号。使用脉冲宽度调制器将误差信号转换为脉宽调制误差信号。电枢位置传感器用于检测电机的电枢位置。换向器电路接收脉宽调制误差信号和电动机的电枢位置。电源开关耦合到换向器的输出并且还耦合到电动机。换向器基于对应的脉冲宽度调制误差信号来控制各个功率开关的激活和去激活，以在对应于期望的参考电流信号的期望的电动机电流下控制电动机。当误差信号相应地具有大致正，负的方向时，换向器控制各个功率开关以更正，更负的方向或以相同的方式驱动电动机来分别增加，减小或维持电动机速度，或零值。

9. 发明授权

US06836386B2 Calibration of tape drive velocity employing DC motor hall sensor 失效
标题翻译：使用直流电机霍尔传感器校准磁带机速度
公开(公告)号：US06836386B2
公开(公告)日：2004-12-28
申请号：US10241510
申请日：2002-09-12
申请人： John Alexander Koski
发明人： John Alexander Koski
IPC分类号： G11B1552
CPC分类号： G11B15/54
摘要： Calibration logic separately operates DC motors of a tape drive at a steady state estimated velocity (Omega C) for at least one full revolution without a tape; senses Hall sensor(s) to indicate a full revolution of each motor, measuring the time of the full revolution; determines the actual velocity (Omega A) of each motor employing the measured time; compares Omega C to Omega A to determine a calibration constant (K calib) for each motor; to calibrate the motor velocity of each motor, for determining the velocity for a mounted tape by averaging the tape velocity generated by each motor based on the calibrated motor velocity.
摘要翻译：校准逻辑以固定的估计速度（Ω-C）将带驱动器的直流电动机分别运行至少一整圈而无需磁带; 感测霍尔传感器以指示每个电机的全转，测量完全旋转的时间; 使用测量时间确定每台电机的实际速度（Ω-A）将Omega C与Omega A进行比较，以确定每台电机的校准常数（K calib）; 以校准每个电机的电机速度，以通过基于校准的电动机速度平均由每个电动机产生的磁带速度来确定安装的磁带的速度。

10. 发明授权

US06817560B2 Combined tension control for tape 失效
标题翻译：胶带组合张力控制
公开(公告)号：US06817560B2
公开(公告)日：2004-11-16
申请号：US10233588
申请日：2002-09-04
申请人： James Mitchell Karp , John Alexander Koski , Steven Carter Wills
发明人： James Mitchell Karp , John Alexander Koski , Steven Carter Wills
IPC分类号： B65H1548
CPC分类号： G11B15/43 , G11B15/442
摘要： Dynamic tension control for tape transported along a tape path between supply and take-up reels, driven by supply and take-up motors, and having tachometers for determining linear speed of the tape. A controller accelerates the tape toward a target speed, initially operating the motors in static acceleration tension control; and if the linear speed of the tape is within a predetermined range of the target tape speed, operating the motors in composite tension control employing static tension control and delta velocity control.
摘要翻译：动力张力控制，用于沿供应和卷取卷轴之间的磁带路径传送的磁带，由供应和卷取电机驱动，并具有用于确定磁带线速度的转速计。控制器将磁带加速到目标速度，最初在静态加速度张力控制中操作电机; 并且如果带的线速度在目标带速度的预定范围内，则使用静态张力控制和Δ速度控制来对复合张力控制中的电动机进行操作。

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