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    • 3. 发明授权
    • Controlling head heating based on upcoming data sector write pattern
    • 基于即将到来的数据扇区写入模式控制磁头加热
    • US07423832B2
    • 2008-09-09
    • US11703317
    • 2007-02-07
    • Bruce BuchJames Fitzpatrick
    • Bruce BuchJames Fitzpatrick
    • G11B21/02G11B27/36
    • G11B5/02G11B5/6064G11B2005/0005
    • A disk drive includes a rotatable data storage disk, a head, a heater element, and a controller. The disk includes a plurality of data sectors between servo spokes. The head is configured to fly on an air cushion relative to the rotating disk while writing data on the data sectors. The heater element is attached to the head and configured to controllably heat the head responsive to a heater signal. The controller determines an upcoming pattern of selected ones of the data sectors on which data is to be written through the head in response to at least one write command from a host device, and controls the heater signal in response to the determined upcoming pattern of data sectors on which data is to be written.
    • 磁盘驱动器包括可旋转数据存储盘,头,加热器元件和控制器。 盘包括伺服轮辐之间的多个数据扇区。 头部配置成相对于旋转盘在气垫上飞行,同时在数据扇区上写入数据。 加热器元件附接到头部并且被配置为响应于加热器信号可控地加热头部。 控制器响应于来自主机设备的至少一个写入命令,确定要通过头部写入数据的所选数据扇区的即将到来的模式,并根据所确定的即将到来的数据模式来控制加热器信号 要写入数据的扇区。
    • 4. 发明授权
    • Synchronous calibration test circuit for use in recording systems
    • 用于记录系统的同步校准测试电路
    • US06222375B1
    • 2001-04-24
    • US09312018
    • 1999-05-14
    • James FitzpatrickChristopher M. Carpenter
    • James FitzpatrickChristopher M. Carpenter
    • G01R3500
    • G11B27/36G11B20/10009G11B20/1403G11B2005/001G11B2220/20
    • A synchronous calibration test circuit in accordance with the principles of this invention that uses a bandgap reference voltage of a PRML chip and a write clock synthesizer to generate an output reference calibration signal comprising a programmable frequency and whose amplitude is invariant with environmental conditions. This reference signal is injected at the input of a signal path of the PRML chip and measured after the PRML's A/D converter using the synchronous test calibration circuit of this invention. Since the programmable frequency reference signal is insensitive to voltage supply fluctuations as well as temperature and process variations this reference signal can be used to measure and characterize changes in the transfer function of the analog signal path of the PRML chip.
    • 根据本发明的原理的同步校准测试电路,其使用PRML芯片的带隙参考电压和写时钟合成器来生成包括可编程频率并且其幅度与环境条件不变的输出参考校准信号。 该参考信号在PRML芯片的信号路径的输入处被注入,并在使用本发明的同步测试校准电路的PRML的A / D转换器之后测量。 由于可编程频率参考信号对电压波动以及温度和过程变化不敏感,因此该参考信号可用于测量和表征PRML芯片的模拟信号路径的传递函数的变化。
    • 5. 发明授权
    • Method using matched filters for determining head positioner micro-jog
in hard disk drive employing magneto-resistive heads
    • 使用匹配滤波器的方法,用于确定使用磁阻头的硬盘驱动器中的头部定位器微点动作
    • US5691857A
    • 1997-11-25
    • US536416
    • 1995-09-29
    • James FitzpatrickXiaodong Che
    • James FitzpatrickXiaodong Che
    • G11B5/012G11B5/48G11B5/596G11B21/10
    • G11B5/012G11B5/4886G11B5/59627G11B5/59683
    • Determining a micro-jog parameter in a disk drive that employs a magneto-resistive (MR) transducer head assembly and a partial response (PRML) detector includes improved accuracy in measuring on-track signal strength by use of a matched filter technique. The matched filter includes circuitry for emulating a partial response signal expected to be produced by a selected test bit pattern prerecorded on the selected track. The matched filtering technique provides improved accuracy in measuring the detected signal strength as it provides an extremely narrow digital filter focused on the test bit pattern frequency. Improved determination of the micro-jog distance further includes measuring interference from adjacent tracks, the best error rate being achieved at micro-jog positions intermediate the maximum on-track signal strength and the minimum off-track interference. A novel digital detector for accurately measuring adjacent track interference also is disclosed.
    • 确定采用磁阻(MR)传感器头部组件和部分响应(PRML)检测器的磁盘驱动器中的微步进参数包括通过使用匹配滤波器技术来提高测量轨道上信号强度的精度。 匹配滤波器包括用于模拟预期由预先记录在所选轨道上的选定测试位模式产生的部分响应信号的电路。 匹配滤波技术提供了测量检测信号强度的精度,因为它提供了一个集中在测试位模式频率上的极窄数字滤波器。 改进的微步距距离的确定还包括测量来自相邻轨道的干扰,在最大导轨信号强度和最小偏离磁道干扰之间的微点位置处实现最佳误码率。 公开了一种用于精确测量相邻轨道干扰的新型数字检测器。
    • 6. 发明授权
    • Refrigerator door assembly with decorative front trim panels
    • 带装饰前装饰板的冰箱门总成
    • US4948206A
    • 1990-08-14
    • US279017
    • 1988-12-02
    • James Fitzpatrick
    • James Fitzpatrick
    • A47F3/04E06B3/30
    • A47F3/043E06B3/305
    • A refrigerator door assembly mountable in an opening of a refrigerator cabinet including a door mounting cabinet frame having a front wall positionable against the cabinet adjacent the opening and a plurality of insulated glass doors mounted in the cabinet frame. The insulated glass doors each include an insulated glass unit and a door frame surrounding and supporting the periphery of the glass unit. Decorative trim panels, preferably made of plastic, are detachably mounted on the door and cabinet frames in overlapping relation to the front walls thereof for providing the desired finished appearance for the door assembly, which may be color coordinated with the decor of the room or commercial establishment in which the refrigerator is installed.
    • 一种可安装在冰柜的开口中的冰箱门组件,其包括门安装柜框架,所述门安装柜框架具有可邻近开口定位抵靠柜体的前壁和安装在柜框架中的多个隔热玻璃门。 隔热玻璃门各自包括隔热玻璃单元和围绕并支撑玻璃单元周边的门框。 优选由塑料制成的装饰装饰板可以与其前壁重叠地拆卸地安装在门和柜框架上,以提供用于门组件的期望的完成外观,其可以与房间或商业装饰的颜色协调 建立冰箱的安装。