公开(公告)号：US5725168A

公开(公告)日：1998-03-10

申请号：US745102

申请日：1996-11-07

申请人： Eiji Yokoyama ,  Masato Nagasawa ,  Kazuo Mori ,  Seiji Kishikawa ,  Masami Tomita ,  Nobuzumi Kurihara

发明人： Eiji Yokoyama ,  Masato Nagasawa ,  Kazuo Mori ,  Seiji Kishikawa ,  Masami Tomita ,  Nobuzumi Kurihara

IPC分类号： H04N5/783 ,  G11B5/584 ,  G11B5/588 ,  G11B15/43 ,  G11B15/473 ,  G11B15/56 ,  G11B15/60 ,  G11B15/61 ,  G11B15/46 ,  G11B23/42

CPC分类号： G11B15/43 ,  G11B15/473 ,  G11B15/56 ,  G11B15/602 ,  G11B15/61 ,  G11B5/588

摘要： A magnetic recording and reproducing apparatus for recording a desired sound or picture signal to a magnetic tape by a magnetic head. At the time of normal-speed recording and reproduction, the magnetic tape is taken up at a constant speed, but by changing the tape travelling speed of the tape on the rotary drum, DTF control and high-speed noiseless reproduction are enabled. The tension of the tape on the entrance side of the rotary drum is controlled to a desired value. This apparatus includes a tape tension actuator and a tape drawing actuator on the entrance side and on the exit side, respectively, of the rotary drum. In DTF control, both tape actuators correct a tracking error of the tape in cooperation with each other. In high-speed noiseless reproduction, both tape actuators are differentially driven so as to lower the tape travelling speed on the rotary drum. Both tape actuators are driven in feedback control using the modern control.

公开(公告)号：US5947402A

公开(公告)日：1999-09-07

申请号：US899203

申请日：1997-07-23

申请人： Eiji Yokoyama ,  Masato Nagasawa ,  Kazuo Mori ,  Seiji Kishikawa ,  Masami Tomita ,  Nobuzumi Kurihara

发明人： Eiji Yokoyama ,  Masato Nagasawa ,  Kazuo Mori ,  Seiji Kishikawa ,  Masami Tomita ,  Nobuzumi Kurihara

IPC分类号： H04N5/783 ,  G11B5/584 ,  G11B5/588 ,  G11B15/43 ,  G11B15/473 ,  G11B15/56 ,  G11B15/60 ,  G11B15/61 ,  G11B15/46 ,  G11B23/42

CPC分类号： G11B15/43 ,  G11B15/473 ,  G11B15/56 ,  G11B15/602 ,  G11B15/61 ,  G11B5/588

摘要： A magnetic recording and reproducing apparatus for recording a desired sound or picture signal to a magnetic tape by a magnetic head. At the time of normal-speed recording and reproduction, the magnetic tape is taken up at a constant speed, but by changing the tape travelling speed of the tape on the rotary drum, DTF control and high-speed noiseless reproduction are enabled. The tension of the tape on the entrance side of the rotary drum is controlled to a desired value. This apparatus includes a tape tension actuator and a tape drawing actuator on the entrance side and on the exit side, respectively, of the rotary drum. In DTF control, both tape actuators correct a tracking error of the tape in cooperation with each other. In high-speed noiseless reproduction, both tape actuators are differentially driven so as to lower the tape travelling speed on the rotary drum. Both tape actuators are driven in feedback control using the modern control.

摘要翻译： 一种用于通过磁头将期望的声音或图像信号记录到磁带的磁记录和重放装置。 在正常速度记录和再现时，磁带以恒定速度被采集，但是通过改变旋转磁鼓上的磁带的磁带行进速度，可以进行DTF控制和高速无噪声再现。 将旋转鼓入口侧的胶带的张力控制在期望值。 该装置包括分别在旋转鼓的入口侧和出口侧的带张力致动器和带拉动致动器。 在DTF控制中，两个磁带执行器彼此协调地校正磁带的跟踪误差。 在高速无声再现中，两个磁带致动器被差动驱动，以便降低旋转磁鼓上的磁带行进速度。 两个磁带执行机构均采用现代控制器进行反馈控制。

公开(公告)号：US5395066A

公开(公告)日：1995-03-07

申请号：US882016

申请日：1992-05-13

申请人： Eiji Yokoyama ,  Masato Nagasawa

发明人： Eiji Yokoyama ,  Masato Nagasawa

IPC分类号： B29C45/23 ,  B29C45/77 ,  G11B15/18 ,  G11B15/43 ,  G11B15/467 ,  G11B15/60 ,  B65H23/26

CPC分类号： G11B15/602 ,  G11B15/1875 ,  G11B15/43 ,  G11B15/4673

摘要： A magnetic recording and reproducing apparatus that realizes a DTF control in a wide frequency range and a noiseless high-speed replay at several tens of times the normal replay speed without degradation of picture quality. Optimum contact between the head of the apparatus and the tape is provided at all times by performing tension control with high precision and in a wide frequency range. A pair of supply side stationary pins and a supply side movable pin driven by a supply side tape actuator is provided on the magnetic tape supply side of the head cylinder that has a rotary head. By controlling the supply side tape actuator to move the movable pin, the tension of the magnetic tape at the head cylinder can be controlled by taking into account the acceleration of the deck. When the tape is replayed at a speed different from the recording speed, the supply side tape actuator and a takeup side tape actuator are operated differentially from each other to perform good tracking.

摘要翻译： 一种磁记录和再现装置，其在宽的频率范围内实现DTF控制，并且在正常重放速度的几十倍下实现无噪声的高速重放，而不会降低图像质量。 通过高精度和宽频率范围内的张力控制，始终提供设备头部和带子之间的最佳接触。 在具有旋转头的头筒的磁带供给侧设置有由供给侧带致动器驱动的一对供给侧固定销和供给侧可动销。 通过控制供给侧带致动器来移动可动销，可以通过考虑到甲板的加速度来控制磁头气缸的磁带的张力。 当以与记录速度不同的速度重放胶带时，供给侧胶带致动器和卷取侧胶带致动器彼此差异地操作以执行良好的跟踪。

公开(公告)号：US5157563A

公开(公告)日：1992-10-20

申请号：US446798

申请日：1989-12-06

申请人： Masato Nagasawa ,  Eiji Yokoyama

发明人： Masato Nagasawa ,  Eiji Yokoyama

IPC分类号： G11B5/588 ,  G11B15/467

CPC分类号： G11B5/588 ,  G11B15/4675

摘要： A magnetic recording and reproducing apparatus for performing automatic tracking in a video tape recorder of a helical scan type. A magnetic head is wobbled by an electromagnetically driven actuator in a transverse direction of a recording track, a tracking error signal is obtained by extracting a signal component attributable to this wobbling from a signal reproduced by the magnetic head, and the extracted signal component is fed back to the electromagnetically driven actuator. By setting the magnetic head width to 1-1.5 times the recording track width, a dead zone is made small, and the tracking error signal is obtained positively. In addition, by setting the frequency for driving the electromagnetically driven actuator at a level between a primary resonance frequency and a secondary resonance frequency and by subjecting the driving frequency to phase conversion, the driving frequency is converted into a high frequency to permit highly accurate tracking. Furthermore, any deviation in the tracking by a fixed magnetic head caused by a DC current and the like is prevented by extracting a low-frequency component containing a DC component from the tracking error signal and by feeding back that extracted signal to a capstan motor for driving a magnetic tape.

公开(公告)号：US5566378A

公开(公告)日：1996-10-15

申请号：US304411

申请日：1994-09-09

申请人： Masato Nagasawa ,  Eiji Yokoyama

发明人： Masato Nagasawa ,  Eiji Yokoyama

IPC分类号： G11B5/588 ,  G11B21/02

CPC分类号： G11B5/588

摘要： A movable head position controlling device for magnetic recording and reproducing apparatuses. The position of a magnetic head is detected. The magnetic head is driven by an actuator in accordance with a driving signal. The driving signal is corrected on the basis of the estimated speed of the magnetic head, the absolute height of the movable head, the displacement of the magnetic head, or the output of an equivalent coil. The speed of the magnetic head is estimated by a speed estimating observer. The absolute height is detected by a magnetic field detecting element. The displacement of the magnetic head is detected by non-contacting sensors attached to a member which moves together with the magnetic head and a member which does not move together with the magnetic head, respectively.

公开(公告)号：US5602688A

公开(公告)日：1997-02-11

申请号：US526176

申请日：1995-09-11

申请人： Eiji Yokoyama ,  Masato Nagasawa

发明人： Eiji Yokoyama ,  Masato Nagasawa

IPC分类号： B29C45/23 ,  B29C45/77 ,  G11B15/18 ,  G11B15/43 ,  G11B15/467 ,  G11B15/60

CPC分类号： G11B15/602 ,  G11B15/1875 ,  G11B15/43 ,  G11B15/4673

摘要： A method and apparatus for controlling surface pressure exerted on a movable magnetic head by a recording medium to provide optimum contact between the movable magnetic head and the recording medium with high precision in a wide frequency range. An estimated surface pressure exerted by the recording medium on the movable magnetic head is determined based upon an electrical simulation of the characteristics of the movable magnetic head. The estimated surface pressure exerted is compared to a reference surface pressure in order to develop a surface pressure control signal. The surface pressure tension of the magnetic recording medium and the position of the movable magnetic head may be controlled in accordance with the surface pressure control signal.

摘要翻译： 一种用于通过记录介质控制施加在可移动磁头上的表面压力的方法和装置，以在宽频率范围内以高精度提供可移动磁头与记录介质之间的最佳接触。 基于可移动磁头的特性的电气仿真来确定由记录介质施加在可移动磁头上的估计表面压力。 将所施加的估计的表面压力与参考表面压力进行比较，以便产生表面压力控制信号。 可以根据表面压力控制信号来控制磁记录介质的表面压力张力和可动磁头的位置。

公开(公告)号：US5404252A

公开(公告)日：1995-04-04

申请号：US48951

申请日：1993-04-14

申请人： Masato Nagasawa ,  Eiji Yokoyama

发明人： Masato Nagasawa ,  Eiji Yokoyama

IPC分类号： G11B5/588 ,  G11B21/02

CPC分类号： G11B5/588

摘要： A movable head position controlling device for magnetic recording and reproducing apparatuses. The position of a magnetic head is detected. The magnetic head is driven by an actuator in accordance with a driving signal. The driving signal is corrected on the basis of the estimated speed of the magnetic head, the absolute height of the movable head, the displacement of the magnetic head, or the output of an equivalent coil. The speed of the magnetic head is estimated by a speed estimating observer. The absolute height is detected by a magnetic field detecting element. The displacement of the magnetic head is detected by non-contacting sensors attached to a member which moves together with the magnetic head and a member which does not move together with the magnetic head, respectively.

摘要翻译： 一种用于磁记录和再现装置的可动头位置控制装置。 检测磁头的位置。 磁头由致动器根据驱动信号驱动。 基于磁头的估计速度，可动头的绝对高度，磁头的位移或等效线圈的输出来校正驱动信号。 磁头的速度由速度估计观测器估计。 绝对高度由磁场检测元件检测。 磁头的位移由附着在与磁头一起移动的构件的不接触传感器和不与磁头一起移动的构件分别检测。

公开(公告)号：US5343342A

公开(公告)日：1994-08-30

申请号：US672876

申请日：1991-03-20

申请人： Yuji Kanagawa ,  Masato Nagasawa ,  Eiji Yokoyama ,  Kimihide Nakatsu ,  Toshiharu Miyago

发明人： Yuji Kanagawa ,  Masato Nagasawa ,  Eiji Yokoyama ,  Kimihide Nakatsu ,  Toshiharu Miyago

IPC分类号： G11B5/588 ,  G11B21/02

CPC分类号： G11B5/588

摘要： In a magnetic recording/playback system having a magnetic head drive device for moving a movable head disposed within and mounted to a rotating upper drum in parallel with the axis of the drum, and a fixed drum supporting the upper drum so that the upper drum can rotate, an AC magnetic field generator is disposed along the peripheral surfaces of the drums at a location at which the magnetic tape is not wrapped on the drums. The AC magnetic field generator applies an AC magnetic field to the movable head that varies in the direction of the axis of the drums. Information on the position of the movable head is detected in accordance with the detection signal of the AC magnetic field derived by the movable head and the position of the movable head is controlled by feeding the detected positional infromation back to the magnetic head driving device.

摘要翻译： 在具有磁头驱动装置的磁记录/重放系统中，磁头驱动装置用于使设置在滚筒的轴线上的旋转的上滚筒内的可移动头移动并安装到旋转的上滚筒上，以及支撑上滚筒的固定滚筒， 旋转时，交流磁场发生器沿着磁鼓的周边表面设置在磁带未包裹在磁鼓上的位置。 交流磁场发生器对可动头施加交流磁场，该磁头在鼓的轴线方向上变化。 根据由可动头导出的AC磁场的检测信号来检测关于可移动头的位置的信息，并且通过将检测到的位置信息馈送回磁头驱动装置来控制可移动头的位置。

公开(公告)号：US5481417A

公开(公告)日：1996-01-02

申请号：US249745

申请日：1994-05-26

申请人： Eiji Yokoyama ,  Masato Nagasawa

发明人： Eiji Yokoyama ,  Masato Nagasawa

IPC分类号： B29C45/23 ,  B29C45/77 ,  G11B15/18 ,  G11B15/43 ,  G11B15/467 ,  G11B15/60

CPC分类号： G11B15/602 ,  G11B15/1875 ,  G11B15/43 ,  G11B15/4673

摘要： It is an object of the invention to realize a DTF control in a wide frequency range and a noiseless high-speed replay at several tens of times the normal relay speed without degradation of picture quality. It is also an object to provide an optimum contact between the head and the tape at all times by performing the tension control with high precision and in wide frequency range.A pair of supply side stationary pins 10a.sub.1, 10a.sub.2 and a supply side movable pin 9a driven by a supply side tape actuator 11a are provided on the magnetic tape supply side of the head cylinder that has a rotary head H. By controlling the supply side tape actuator 11a to move the movable pin 9a, the tension of the magnetic tape T at the head cylinder can be controlled. When the tape is replayed at speed different from the recording speed, the supply side tape actuator 11a and a takeup side tape actuator are operated differentially from each other to perform a good tracking.

摘要翻译： 本发明的一个目的是在宽的频率范围内实现DTF控制，并且在正常的中继速度的几十倍下实现无噪声的高速重放，而不会降低图像质量。 本发明的另一个目的是通过以高精度和宽的频率范围进行张力控制，始终提供头与带之间的最佳接触。 在具有旋转头H的头筒的磁带供给侧设置有由供给侧带致动器11a驱动的一对供给侧固定销10a1,10a2和供给侧可动销9a。通过控制供给侧带 致动器11a移动可动销9a，可以控制磁带T在磁头柱上的张力。 当以与记录速度不同的速度重放带时，供给侧带致动器11a和卷绕侧带致动器彼此差异地操作以执行良好的跟踪。

公开(公告)号：US5384676A

公开(公告)日：1995-01-24

申请号：US870459

申请日：1992-04-17

申请人： Eiji Yokoyama ,  Masato Nagasawa

发明人： Eiji Yokoyama ,  Masato Nagasawa

IPC分类号： G11B5/588

CPC分类号： G11B5/588

摘要： In a magnetic recording and reproducing apparatus having a solenoid-driven actuator to move a magnetic head in the tracking direction, a magnetic head position controller includes a state estimator for estimating the moving speed of the actuator from a drive voltage and a drive current supplied to the actuator; and a damping control loop for feeding back the estimated speed signal estimated by the state estimator to the actuator drive voltage. The state estimator is formed of a combination of equivalent circuits that electrically simulate modeled characteristics of the solenoid-driven actuator and receives the drive voltage and the drive current of the actuator and produces the estimated speed signal representing the speed of the actuator. The state estimator includes equivalent circuits that electrically simulate a drive coil resistance and inductance characteristic of the solenoid-driven actuator; a force constant of a magnetic circuit of the solenoid-drive actuator; and an inertia, a spring constant, and a counter electromotive force of the solenoid-driven actuator.

摘要翻译： 在具有螺线管驱动致动器以沿跟踪方向移动磁头的磁记录和再现装置中，磁头位置控制器包括状态估计器，用于根据驱动电压和驱动电流来提供致动器的移动速度 执行机构 以及用于将由状态估计器估计的估计速度信号反馈到致动器驱动电压的阻尼控制回路。 状态估计器由电学模拟电磁驱动致动器的建模特性并接收驱动电压和致动器的驱动电流的等效电路的组合形成，并产生表示致动器速度的估计速度信号。 状态估计器包括电动模拟电磁驱动致动器的驱动线圈电阻和电感特性的等效电路; 螺线管驱动致动器的磁路的力常数; 以及螺线管驱动致动器的惯性，弹簧常数和反电动势。