公开(公告)号：US4000432A

公开(公告)日：1976-12-28

申请号：US599272

申请日：1975-07-25

申请人： Warren P. Coon ,  Elisha B. Merritt

发明人： Warren P. Coon ,  Elisha B. Merritt

IPC分类号： H01J29/00 ,  H01J29/86 ,  H01J1/52

CPC分类号： H01J29/867 ,  H01J29/003 ,  H01J2229/003

摘要： Intensifier tubes for x-rays or low-light levels form an image of photoelectrons which is focused on a fluorescent viewing screen. Stray magnetic fields, including the earth's field, bend the electron trajectories and distort the image. Magnetic shielding has been used around the tube, leaving the image-receiving end open. Magnetic field leaking through the open end is reduced by extending the end of the shield around the image-receiving aperture inward and forward of the edge of the tube.

摘要翻译： 用于x射线或低光级的增强管形成聚焦在荧光观察屏上的光电子的图像。 杂散磁场，包括地球场，弯曲电子轨迹并扭曲图像。 管周围已经使用磁屏蔽，使图像接收端打开。 通过将图像接收孔周围的图像接收孔的端部延伸到管的边缘的内部和前部来减小通过开口端泄漏的磁场。

公开(公告)号：US5567864A

公开(公告)日：1996-10-22

申请号：US263999

申请日：1994-06-22

申请人： Warren P. Coon ,  Stuart C. Watkins ,  Charles M. Kropp

发明人： Warren P. Coon ,  Stuart C. Watkins ,  Charles M. Kropp

IPC分类号： G11B21/21 ,  G11B33/10 ,  G01B21/30

CPC分类号： G11B33/10 ,  G11B21/21

摘要： A method and apparatus for calibrating a flying height measurement instrument that: (1) precisely determines the actual height of a recording head over a disk, (2) is inexpensive, (3) permits the head whose flying height is to be measured to be used during the calibration procedure, and (4) is nondestructive to the calibration apparatus. In addition, the present invention can be used to calibrate different flying height measurement instruments and is independently verifiable. During the inventive calibration process, a special calibration slider is positioned over a measurement disk of a flying height measurement instrument in place of a slider which normally flies over the measurement disk when the flying height of a slider is being measured. The calibration slider has at least one support structure of a known height. During calibration of the flying height measurement instrument, the calibration slider is supported by the support structure over the measurement disk, such that the calibration slider is spaced apart from the calibration disk by the height of the support structure. The spacing is then statically determined. The result of the static measurement is used to plot the relationship between the output of the instrument during a dynamic measurement and the actual height of the recording head.

摘要翻译： 一种用于校准飞行高度测量仪器的方法和装置：（1）精确地确定记录头在盘上的实际高度，（2）是便宜的，（3）允许测量飞行高度的头是 在校准过程中使用，和（4）对校准装置是非破坏性的。 此外，本发明可用于校准不同的飞行高度测量仪器，并且可独立验证。 在本发明的校准过程中，当飞行高度测量仪器的测量盘被放置在飞行高度测量仪器的测量盘上时，代替当测量滑块的飞行高度时通常飞过测量盘的滑块。 校准滑块具有至少一个已知高度的支撑结构。 在飞行高度测量仪器的校准期间，校准滑块由测量盘上的支撑结构支撑，使得校准滑块与校准盘隔开支撑结构的高度。 然后静态确定间距。 静态测量的结果用于绘制动态测量期间仪器的输出与记录头的实际高度之间的关系。