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1. 发明授权

US07724460B2 Magneto-resistive head resistance sensor 有权
标题翻译：磁阻电阻传感器
公开(公告)号：US07724460B2
公开(公告)日：2010-05-25
申请号：US11034997
申请日：2005-01-13
申请人： David J. Fitzgerald , Jeffrey A. Gleason , James P. Howley , Scott M. O'Brien , Michael P. Straub
发明人： David J. Fitzgerald , Jeffrey A. Gleason , James P. Howley , Scott M. O'Brien , Michael P. Straub
IPC分类号： G11B5/02 , G11B5/03 , G11B5/09
CPC分类号： G11B5/02 , G11B2005/001 , G11B2005/0018
摘要： A recording system employing a magneto-resistive (MR) element senses a resistance value of the MR element and generates one or more MR resistance (MRR) signal values based on the sensed MR element resistance value. The MRR signal values might be, for example, current or voltage values proportional or inversely proportional to the MR element resistance value. The MRR signal values might be employed to control one or more of: i) a unity gain bandwidth of a bias loop for the MR element, ii) an MR read head preamplifier low corner frequency, and iii) a slew rate across the MR element.
摘要翻译：使用磁阻（MR）元件的记录系统感测MR元件的电阻值，并且基于感测的MR元件电阻值产生一个或多个MR电阻（MRR）信号值。 MRR信号值可以是例如与MR元件电阻值成比例或成反比的电流值或电压值。可以采用MRR信号值来控制以下各项中的一个或多个：i）用于MR元件的偏置环路的单位增益带宽，ii）MR读取头前置放大器低转角频率，以及iii）横跨MR元件的转换速率。

2. 发明授权

US07119977B2 Reduced recovery time for perpendicular recording systems 有权
标题翻译：缩短垂直记录系统的恢复时间
公开(公告)号：US07119977B2
公开(公告)日：2006-10-10
申请号：US11091352
申请日：2005-03-28
申请人： Daniel J. Dolan, Jr. , James P. Howley , Zachary Keirn , German Feyh , Michael P. Straub
发明人： Daniel J. Dolan, Jr. , James P. Howley , Zachary Keirn , German Feyh , Michael P. Straub
IPC分类号： G11B5/02
CPC分类号： G11B20/10203 , G11B5/012 , G11B5/09 , G11B5/1278 , G11B20/10009 , G11B20/1403 , G11B2005/001
摘要： User data is read from a medium having servo data and user data encoded thereon. The user data is read with a read/write head that is operable in a write mode and a read mode. Servo data is read in a time window following a transition from write mode to read mode, with a frequency passband that has a first low frequency corner. User data is read from the medium after expiration of the time window, with a frequency passband that has a second low frequency corner that is lower than the first low frequency corner.
摘要翻译：从具有伺服数据和在其上编码的用户数据的介质读取用户数据。读取/写入头可以在写入模式和读取模式下操作用户数据。在从写入模式转换到读取模式之后的时间窗口中读取伺服数据，具有第一低频角的频率通带。用户数据在时间窗口到期后从介质中读取，频率通带具有低于第一低频角的第二低频角。

3. 发明授权

US07443896B2 Optical midpoint power control and extinction ratio control of a semiconductor laser 有权
标题翻译：半导体激光器的光中点功率控制和消光比控制
公开(公告)号：US07443896B2
公开(公告)日：2008-10-28
申请号：US10616334
申请日：2003-07-09
申请人： Jonathan H. Fischer , James P. Howley
发明人： Jonathan H. Fischer , James P. Howley
IPC分类号： H01S3/00
CPC分类号： H01S5/0683 , H01S5/042 , H01S5/06812
摘要： The present invention provides a method and apparatus, such as an integrated circuit, to control the optical midpoint power level and the extinction ratio of a semiconductor laser and maintain the optical midpoint power level and the extinction ratio substantially constant at corresponding predetermined levels. Apparatus embodiments include a semiconductor laser, a modulator, a photodetector, an optical midpoint controller, and an extinction ratio controller. The semiconductor laser is capable of transmitting an optical signal in response to a modulation current. The modulator is capable of providing the modulation current to the semiconductor laser, with the modulation current corresponding to an input data signal. The photodetector, which is optically coupled to the semiconductor laser, is capable of converting the optical signal into a photodetector current. In response to the photodetector current, the optical midpoint controller is capable of adjusting the forward bias current of the semiconductor laser, and the extinction ratio controller is capable of adjusting the modulation current provided by the modulator to the semiconductor laser, to respectively generate the optical signal having substantially a predetermined optical midpoint power level and a predetermined extinction ratio.
摘要翻译：本发明提供了一种诸如集成电路的方法和装置，用于控制半导体激光器的光中点功率电平和消光比，并将光中点功率电平和消光比保持在相应的预定电平上。装置实施例包括半导体激光器，调制器，光电检测器，光中点控制器和消光比控制器。半导体激光器能够响应于调制电流而发送光信号。调制器能够向半导体激光器提供调制电流，调制电流对应于输入数据信号。光学耦合到半导体激光器的光电检测器能够将光信号转换成光电检测器电流。响应于光电检测器电流，光中点控制器能够调节半导体激光器的正向偏置电流，并且消光比控制器能够调制由调制器提供给半导体激光器的调制电流，以分别产生光学信号具有基本上预定的光中点功率电平和预定的消光比。

4. 发明授权

US06862379B2 Extinction ratio control of a semiconductor laser 有权
标题翻译：半导体激光器的消光比控制
公开(公告)号：US06862379B2
公开(公告)日：2005-03-01
申请号：US10616332
申请日：2003-07-09
申请人： James P. Howley
发明人： James P. Howley
IPC分类号： G02B6/00 , G02B6/12 , H01S5/026 , H01S5/062 , H01S5/0683
CPC分类号： H01S5/062 , H01S5/026 , H01S5/0264
摘要： The present invention provides a method and apparatus, such as an integrated circuit, to control the extinction ratio of a semiconductor laser and maintain the extinction ratio substantially constant at a predetermined level. Apparatus embodiments include a semiconductor laser, a modulator, a photodetector, and an extinction ratio controller. The semiconductor laser is capable of transmitting an optical signal in response to a modulation current. The modulator is capable of providing the modulation current to the semiconductor laser, with the modulation current corresponding to an input data signal. The photodetector, which is optically coupled to the semiconductor laser, is capable of converting the optical signal into a photodetector current. The extinction ratio controller, in response to the photodetector current, is capable of adjusting the modulation current provided by the modulator to the semiconductor laser to generate the optical signal having substantially a predetermined extinction ratio.
摘要翻译：本发明提供了一种控制半导体激光器的消光比并将消光比保持在预定水平的方法和装置，例如集成电路。装置实施例包括半导体激光器，调制器，光电检测器和消光比控制器。半导体激光器能够响应于调制电流而发送光信号。调制器能够向半导体激光器提供调制电流，调制电流对应于输入数据信号。光学耦合到半导体激光器的光电检测器能够将光信号转换成光电检测器电流。响应于光电检测器电流，消光比控制器能够将由调制器提供的调制电流调节到半导体激光器，以产生具有基本上预定消光比的光信号。

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