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1. 发明授权

US4233666A Drive power sequencing 失效
标题翻译：驱动电源排序
公开(公告)号：US4233666A
公开(公告)日：1980-11-11
申请号：US952767
申请日：1978-10-19
申请人： Per-Erik Walberg , Donald F. Johann , Charles E. Mendenhall
发明人： Per-Erik Walberg , Donald F. Johann , Charles E. Mendenhall
IPC分类号： G05F1/577 , G06F1/00
CPC分类号： G05F1/577
摘要： In a digital information storage system or the like, start up power sequencing for independently operable machines such as disk drives each equipped with a microprocessing unit is provided through a simplified power sequencing circuit. The power sequencing circuit is operatively coupled with an independent preprogrammable micropocessing unit in each machine and to a single control line common to all disk drives. The microprocessing unit is preprogrammed to interact with the power sequencing circuit to provide Enable/Disable signals to the control line and to sense the state of the control line. In particular, the microprocessing unit executes a preprogrammed sequence of steps in interaction with the control line to sequence the start-up of each spindle motor irrespective of the number of disk drives coupled to the control line, thereby preventing electrical power overload.
摘要翻译：在数字信息存储系统等中，通过简化的功率排序电路来提供启动用于独立可操作的机器的功率排序，例如各自配备有微处理单元的磁盘驱动器。电源排序电路与每个机器中的独立的可预编程微处理单元可操作地耦合到所有磁盘驱动器通用的单个控制线。微处理单元被预编程以与电源排序电路交互以向控制线提供启用/禁用信号并感测控制线的状态。特别地，微处理单元执行与控制线相互作用的预编程步骤序列，以对每个主轴电动机的起动进行排序，而不管耦合到控制线的盘驱动器的数量如何，从而防止电力过载。

2. 发明授权

US4268905A Autonomous fault diagnosis for disk drive using an internal microprocessor 失效
标题翻译：使用内部微处理器进行磁盘驱动器的自动故障诊断
公开(公告)号：US4268905A
公开(公告)日：1981-05-19
申请号：US969604
申请日：1978-12-14
申请人： Donald F. Johann , Charles E. Mendenhall
发明人： Donald F. Johann , Charles E. Mendenhall
IPC分类号： G06F11/22 , G11B19/04 , G11B20/18 , G06F11/00 , G06F13/04
CPC分类号： G11B19/04 , G06F11/22 , G11B20/1816
摘要： A disk drive control system incorporating an internal microprocessor and internal testing capabilities. The disk drive control system is capable of simulating drive operation without carriage motion so as to test substantially all functional subsystems of the disk drive. The test technique comprises the exercising of subsystems and a diagnosis of operations according to a hierarchy of interdependence of subsystem operation.
摘要翻译：包含内部微处理器和内部测试功能的磁盘驱动器控制系统。磁盘驱动器控制系统能够模拟没有滑架运动的驱动操作，以便基本上测试磁盘驱动器的所有功能子系统。测试技术包括根据子系统操作的相互依赖性层次来运行子系统和操作诊断。

3. 发明授权

US5355356A Charge pump for restoring DC in an optical recording read channel 失效
标题翻译：用于在光学记录读取通道中恢复DC的电荷泵
公开(公告)号：US5355356A
公开(公告)日：1994-10-11
申请号：US63907
申请日：1993-05-19
申请人： Donald F. Johann , John E. DeFiore
发明人： Donald F. Johann , John E. DeFiore
IPC分类号： G11B20/10 , G11B5/76 , G11B5/09 , H04N5/76
CPC分类号： G11B20/10203
摘要： An optical recording system having a DC restored read signal for qualifying pulses in the read channel. The equalized and filtered read signal is input to a differentiator and a DC restore circuit. The zero crossings of the differentiated signal which represent the peaks of the pulses are detected. The DC restore circuit inverts the read signal, generates a reference voltage, and compares the negative pulses peaks of the read signal to the reference voltage. The charge of a capacitor is adjusted according to the difference in voltages of the pulse peaks to that of the reference voltage in order to maintain a constant DC level. The DC restored signal is qualified according to a threshold. Only those pulses which have zero crossings and which have been qualified are considered to be valid.
摘要翻译：一种具有用于在读通道中限定脉冲的DC恢复读信号的光记录系统。均衡和滤波的读取信号被输入到微分器和DC恢复电路。检测表示脉冲峰值的微分信号的零交叉。直流恢复电路反转读取信号，产生参考电压，并将读取信号的负脉冲峰值与参考电压进行比较。根据脉冲峰值的电压差与参考电压的电压差来调节电容器的电荷，以保持恒定的直流电平。 DC恢复信号根据阈值进行限定。只有那些具有零交叉且已经合格的脉冲被认为是有效的。

4. 发明授权

US5341360A Method and apparatus for calibrating laser write power by averaging upper and lower knees of a calibration profile 失效
标题翻译：通过平均校准轮廓的上下膝盖校准激光写入功率的方法和装置
公开(公告)号：US5341360A
公开(公告)日：1994-08-23
申请号：US893777
申请日：1992-06-05
申请人： Donald F. Johann , Alan C. Burroughs , Neil T. Phipps , Feng Li
发明人： Donald F. Johann , Alan C. Burroughs , Neil T. Phipps , Feng Li
IPC分类号： G11B7/125 , G11B11/105
CPC分类号： G11B7/126 , G11B11/10502 , G11B11/10595
摘要： In an optical recording system employing a laser for writing digital data onto a storage medium, an apparatus and method for calibrating a laser to a power level which minimizes write errors. A calibration profile is generated by writing test data patterns onto the storage medium by using a number of different predetermined laser power levels. The test data patterns are then read back. The number of write errors is determined for each of the different laser power levels by comparing the written data patterns to the read back data patterns. The calibration profile denotes the number of write errors as a function of laser power levels. Next, an optimum laser power is determined corresponding to an average of an upper and a lower knee of the calibration profile. The laser is calibrated to this optimum power level.
摘要翻译：在采用用于将数字数据写入存储介质的激光器的光学记录系统中，用于将激光校准为使写入错误最小化的功率水平的装置和方法。通过使用多个不同的预定激光功率电平将测试数据模式写入存储介质来产生校准曲线。然后读取测试数据模式。通过将写入的数据模式与回读数据模式进行比较，为每个不同的激光功率电平确定写入错误的数量。校准曲线表示作为激光功率电平的函数的写入误差的数量。接下来，对应于校准曲线的上下膝的平均值确定最佳激光功率。激光器被校准到该最佳功率水平。

5. 发明授权

US5396479A Apparatus and method for setting a threshold level to maintain duty cycle in a pulse width modulated optical recording system 失效
标题翻译：用于设置阈值电平以维持脉宽调制光学记录系统中的占空比的装置和方法
公开(公告)号：US5396479A
公开(公告)日：1995-03-07
申请号：US239249
申请日：1994-05-06
申请人： Donald F. Johann
发明人： Donald F. Johann
IPC分类号： G11B7/005 , G11B20/10 , G11B7/00 , G11B5/09
CPC分类号： G11B7/005 , G11B20/10009
摘要： An apparatus for setting a threshold voltage for determining bit positions of digital data stored on an optical recording device utilizing pulse width modulation. The optical recording device reads a pattern from an optical medium. The read pattern has a fixed, known duty cycle. A feedback circuit processes the pattern according to an initial threshold voltage. The feedback signal is then input to a comparator. The comparator compares the feedback signal against the pattern. Based on this comparison, the amount of current input to and output from a compensation circuit is adjusted. Thereupon, the compensation circuit sets the threshold voltage accordingly.
摘要翻译：一种用于设置用于确定利用脉冲宽度调制存储在光学记录装置上的数字数据的位位置的阈值电压的装置。光学记录装置从光学介质读取图案。读取模式具有固定的已知占空比。反馈电路根据初始阈值电压来处理图案。然后将反馈信号输入到比较器。比较器比较反馈信号与模式。基于该比较，调整输入到补偿电路和从补偿电路输出的电流量。因此，补偿电路相应地设置阈值电压。

6. 发明授权

US5184343A Compensation for dust on an optical disk by increasing laser writing power 失效
标题翻译：通过增加激光写入功率来补偿光盘上的灰尘
公开(公告)号：US5184343A
公开(公告)日：1993-02-02
申请号：US696230
申请日：1991-05-06
申请人： Donald F. Johann , Alan C. Burroughs
发明人： Donald F. Johann , Alan C. Burroughs
IPC分类号： G11B7/125
CPC分类号： G11B7/126
摘要： An apparatus and method for compensating for dust particles on the surface of an optical disk during a write operation includes a circuit for sensing the reflected laser light back from the optical storage medium, and a negative peak detection circuit for determining when the reflected laser light drops below the average read power level. The reflected laser power is reduced below the average read level whenever a dust or dirt particle is blocking a portion of the incoming laser light. An additonal circuit means then increases the power of the laser beam by an amount proportional to the detected reduction so that the data can be effectively recorded.
摘要翻译：在写入操作期间用于补偿光盘表面上的灰尘颗粒的装置和方法包括用于感测从光存储介质返回的反射激光的电路和用于确定反射的激光何时下降的负峰值检测电路低于平均读取功率水平。每当灰尘或污垢颗粒阻挡进入的激光的一部分时，反射的激光功率降低到平均读取水平以下。然后，附加电路装置将激光束的功率增加与检测到的减小成比例的量，使得可以有效地记录数据。

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