发明名称 |
Cathode for high emission x-ray tube |
摘要 |
A method and apparatus for an x-ray tube having an emitter and a differentially biased emitter-cup cathode configured to provide an electron beam of substantially greater perveance and beam compression ratio than otherwise obtainable with conventional cathode designs is disclosed. The method and apparatus include a cathode assembly opposing an anode and spaced apart therefrom. The cathode is maintained during operation of the x-ray tube at a negative potential with respect to the anode. The cathode assembly includes an emitter for emitting an electron beam to a focal spot on the anode during operation of the x-ray tube and a cathode front member having an aperture defined by the cathode front member on a first side of the emitter. A backing is disposed on a second side of the emitter and is operably connected to the cathode front member via a backing insulator. The cathode further includes a means for applying a differential bias in the cathode assembly to variably change the focal spot size.
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申请公布号 |
US6785359(B2) |
申请公布日期 |
2004.08.31 |
申请号 |
US20020064606 |
申请日期 |
2002.07.30 |
申请人 |
GE MEDICAL SYSTEMS GLOBAL TECHNOLOGY COMPANY, LLC |
发明人 |
LEMAITRE SERGIO |
分类号 |
H01J35/14;H01J35/06;(IPC1-7):H01J35/06 |
主分类号 |
H01J35/14 |
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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