发明名称 |
X-ray tube electron beam switching and biasing method and apparatus |
摘要 |
An X-ray tube having a capability to produce multiple anode spots. The X-ray tube can produce three or more different size anode focal spots without modification of the connectors, cabling, or high voltage supply for routing high voltage signals to the X-ray tube. An isolating fiber optic control input connects an external light emitting diode to a controller inside the tube housing. The controller responds to light signals from the light emitting diode to control the size of focus spots on the tube anode. In a preferred embodiment each of three filaments are individually energized to produce three different size focal spots and a cathode cup to which the filaments are mounted is also biased to add a four spot capability. In an alternate embodiment a split or segmented cathode cup has its segments biased to different electrical potentials by tapping power from a conventional high voltage filament supply used in energizing a cathode filament. Confirmation circuitry monitors operation of the controller and deactivates the X-ray tube in the event of a controller malfunction.
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申请公布号 |
US4685118(A) |
申请公布日期 |
1987.08.04 |
申请号 |
US19850752311 |
申请日期 |
1985.07.03 |
申请人 |
PICKER INTERNATIONAL, INC. |
发明人 |
FURBEE, AVERY D.;PLEIL, VIKTOR W.;BURKE, JAMES E. |
分类号 |
H01J35/06;H01J35/14;H05G1/08;H05G1/26;H05G1/34;H05G1/52;(IPC1-7):H05G1/56 |
主分类号 |
H01J35/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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