公开(公告)号：US5189355A

公开(公告)日：1993-02-23

申请号：US866695

申请日：1992-04-10

申请人： David N. Larkins ,  Glenn T. Yoshida ,  Thomas L. Helmers

发明人： David N. Larkins ,  Glenn T. Yoshida ,  Thomas L. Helmers

IPC分类号： G11B15/02 ,  G11B15/10 ,  G11B15/18 ,  G11B19/00 ,  G11B27/024 ,  G11B27/028

CPC分类号： G11B19/00 ,  G11B15/026 ,  G11B15/103 ,  G11B15/1875 ,  G05B2219/23053 ,  G05B2219/23379 ,  G05B2219/35459 ,  G05B2219/37023 ,  G05B2219/37396 ,  G11B2220/90 ,  G11B27/024 ,  G11B27/028 ,  H01H2003/008

摘要： An apparatus for controlling conditions in response to an operator input, the apparatus including a rotary knob coupled to the shaft of the rotor of a stepper motor having first and second stator windings, in quadrature, with each winding being center tap grounded to provide first and second winding portions for each winding. One pair of first winding portions are used for providing pulse inputs to a microprocessor on rotation of the knob, in either direction, via a pulse control system, with the microprocessor providing command signals to a braking control system, which includes a direct current power control source, which may be either a voltage or current control source. The power control source, in turn is in circuit relation with the pair of second winding portions. On command of the processor, a force or torque is applied to the rotor, by means of energization of the other pair of winding portions, with the force being in opposition to the direction of rotation of the knob, the force being in proportion to the applied power. Under control of a microprocessor, the force may be intermittently applied to simulate a mechanical detent arrangement, or a constant force for braking, either of which provides tactile feedback to the operator.

公开(公告)号：US5248112A

公开(公告)日：1993-09-28

申请号：US492241

申请日：1990-03-08

申请人： David R. Rodal ,  Glenn T. Yoshida

发明人： David R. Rodal ,  Glenn T. Yoshida

IPC分类号： G11B15/43 ,  G11B15/46

CPC分类号： G11B15/43 ,  G11B15/46

摘要： A feedforward circuit applies a capstan drive current, or its equivalent, to the reel tension servo circuits whose associated reels are transporting the tape. The additional drive current to the reel drive motors increases the rotational velocity of the reels to maintain the same resultant acceleration between the tape driven by the capstan and the tape being transported between reels. Since the tape pack affects the gain of the feedforward circuit, a preselected average gain corresponding to the mean tape pack diameter is used to match different cassette sizes. A microprocessor may be used to provide the various signals and may vary the gain of the feedforward circuit not only in response to reel size but also in response to instantaneous reel tape pack diameter.

摘要翻译： 前馈电路将主导轴驱动电流或其等效物施加到相关联的卷轴正在传送带的卷轴张力伺服电路。 到卷轴驱动电动机的附加驱动电流增加了卷轴的旋转速度，以便在由主导轴驱动的带和在卷盘之间传送的带之间保持相同的合成加速度。 由于磁带包影响前馈电路的增益，因此使用与平均磁带包直径相对应的预选平均增益来匹配不同的磁带盒大小。 可以使用微处理器来提供各种信号，并且可以改变前馈电路的增益，不仅响应于卷轴尺寸而且还响应于瞬时卷轴带包装直径。

公开(公告)号：US4414658A

公开(公告)日：1983-11-08

申请号：US273235

申请日：1981-06-12

申请人： Glenn T. Yoshida

发明人： Glenn T. Yoshida

IPC分类号： G11B7/09 ,  G11B7/00 ,  G11B21/10

CPC分类号： G11B7/0901

摘要： An optical system for recording information on or retrieving information from a rotating disc is disclosed herein. In this system a beam of light located on one side of the disc is directed onto and laterally across a given track of the disc. The track serves to contain the recorded information and, ignoring this information, is characterized by a predetermined light transmissivity curve in its cross-direction. An arrangement for maintaining the beam and given track in a fixed lateral position relative to one another as the disc rotates, even if the track moves laterally to a limited extent from its intended path of movement, is also disclosed herein. This position maintaining arrangement utilizes circuitry including light sensitive means, specifically two light detectors having trapezoidal light sensitive surfaces, disposed in optical alignment with the beam on an opposite side of the disc and responsive to the light passing through the disc from the beam for producing an electrical error signal corresponding in time to and substantially linearly in magnitude with limited lateral deviations of the given track from its intended position with respect to the light beam, this linear relationship resulting from the configurations of the light sensitive surfaces. The error signal is in turn utilized to vary the position of the initial beam for minimizing the lateral deviations relative to the beam.

摘要翻译： 本文公开了一种用于从旋转盘记录信息或从其回收信息的光学系统。 在该系统中，位于盘的一侧的光束被引导到盘的给定轨道上并横向穿过。 该轨道用于包含所记录的信息，忽略该信息的特征在于其横向上的预定光透射率曲线。 这里还公开了一种用于当光盘旋转时将光束和给定光轨保持在相对于彼此的固定横向位置的布置，即使轨道从其预期的移动路径侧向移动到有限的程度。 该位置维持装置利用了包括光敏装置的电路，具体地说，具有梯形光敏表面的两个光检测器，其设置成与光盘对准在光盘的相对侧，并且响应于从光束通过光盘的光， 由于光敏表面的结构产生的线性关系，电子误差信号在时间上相当于并且基本线性地大小，其中给定轨道的相对于光束的预期位置的有限的横向偏差。 反过来利用误差信号来改变初始光束的位置，以最小化相对于光束的横向偏差。