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1. 发明授权

US4700056A Objective lens focus initialization system 失效
标题翻译：物镜聚焦初始化系统
公开(公告)号：US4700056A
公开(公告)日：1987-10-13
申请号：US797434
申请日：1985-11-13
申请人： Dorrel R. Silvy , Todd D. Baumann , Roger R. Bracht
发明人： Dorrel R. Silvy , Todd D. Baumann , Roger R. Bracht
IPC分类号： G11B7/09 , G01J1/20 , G11B5/09
CPC分类号： G11B7/0945
摘要： A focus initialization system adapted for use with an optical data recording system. Focus initialization is performed while a tracking servo loop is in an open loop mode, and an objective lens is fixedly positioned along a tracking axis. With a focus servo system in an open loop mode, the objective lens is cyclically driven along a focus axis about a neutral position and between offset positions. Displacement of the offset positions from the neutral position is increased with each successive cycle. After the objective lens has been positioned at each peak offset position, the focus servo loop is closed and track crossings resultant from eccentricity of the servo tracks on the record carrier are counted. Focus capture is recognized when at least a predetermined number of track crossings are counted during a predetermined time period. If less than the predetermined number of track crossings are counted during the predetermined time period, the focus servo loop is opened and the objective lens is driven to a successive offset position.
摘要翻译：适用于光学数据记录系统的聚焦初始化系统。在跟踪伺服环路处于开环模式的同时执行对焦初始化，并且物镜沿着跟踪轴固定地定位。利用聚焦伺服系统处于开环模式，物镜沿着焦点轴线绕中立位置和偏移位置循环驱动。偏移位置与中立位置的位移随每个连续的循环而增加。在物镜位于每个峰值偏移位置之后，聚焦伺服环路闭合，并记录由记录载体上的伺服轨道的偏心引起的交叉点。当在预定时间段期间至少预定数量的轨道交叉点被计数时，识别焦点捕获。如果在预定时间段期间小于预定数量的轨道交叉点，则聚焦伺服环路被打开并且物镜被驱动到连续的偏移位置。

2. 发明授权

US5343131A Method and apparatus for self-synchronizing seek deceleration 失效
标题翻译：用于自动同步寻道减速的方法和装置
公开(公告)号：US5343131A
公开(公告)日：1994-08-30
申请号：US009773
申请日：1993-01-27
申请人： Todd D. Baumann
发明人： Todd D. Baumann
IPC分类号： G05D3/12 , G11B21/08 , G05B11/06
CPC分类号： G11B21/083
摘要： During the deceleration portion of a seek operation, the current level provided to the actuator motor of a disk drive is based on a desired linear deceleration versus time profile that has been temporally advanced by half of a servo data position sampling interval. At each position sampling interval, a new current level is determined and maintained for the interval between samples. The actual deceleration current follows a staircase curve centered on the desired profile so as to be self-synchronizing. The current level is also adjusted to compensate for the delay between obtaining a new servo data position sample and applying a new current level to the motor.
摘要翻译：在寻道操作的减速部分期间，提供给盘驱动器的致动器电动机的电流水平是基于时间上提前了伺服数据位置采样间隔的一半的期望的线性减速度对时间曲线。在每个位置采样间隔，为样本之间的间隔确定和维护新的电流电平。实际减速电流遵循以所需轮廓为中心的阶梯曲线，以便自同步。还调整当前电平以补偿获得新的伺服数据位置采样和向电动机施加新的电流电平之间的延迟。

3. 发明授权

US4967291A Method and apparatus for preventing an over-velocity error condition of a hard disk drive system 失效
标题翻译：用于防止硬盘驱动系统的超速错误状态的方法和装置
公开(公告)号：US4967291A
公开(公告)日：1990-10-30
申请号：US266127
申请日：1988-11-02
申请人： James J. Touchton , Todd D. Baumann
发明人： James J. Touchton , Todd D. Baumann
IPC分类号： G11B5/55
CPC分类号： G11B5/5547
摘要： An apparatus for detecting an over-velocity error condition of a head actuator driven by a voice coil motor in a hard disk drive system includes an integrator for providing an integrated value of the current flowing through the voice coil motor and a detector for detecting when the integrated value exceeds a threshold value. In response to this detection, the supply of current through the voice coil motor is interrupted. To prevent false detections, the integrator is inhibited until the motor current reaches a level indicative of a track access operation.
摘要翻译：用于检测由硬盘驱动系统中的音圈电动机驱动的磁头致动器的超速度误差状态的装置包括：积分器，用于提供流过音圈电动机的电流的积分值;以及检测器，用于检测何时积分值超过阈值。响应于该检测，通过音圈电机的电流供应被中断。为了防止错误检测，积分器被禁止，直到电动机电流达到指示轨道存取操作的水平。

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