Filament for X-ray tube and X-ray tube having the same

Details Filament for X-ray tube and X-ray tube having the same Filament for X-ray tube and X-ray tube having the same

2007-09-18

2007-09-18

Bruce, David (Department: 2809)

Electric lamp and discharge devices

Electrode and shield structures

Filament or resistance heated electrodes

C313S271000

Reexamination Certificate

active

11583747

ABSTRACT:
A filament for an X-ray tube has a varied wire diameter but has a constant coil outside diameter to obtain a good uniformity of the longitudinal temperature distribution of the filament. The filament has a wire diameter d which is gradually reduced from the longitudinal central region to the longitudinal ends while the coil outside diameter D is fixed along the longitudinal direction. The wire is polished at only the inside of the coil to reduce the wire diameter. In order to make the longitudinal temperature distribution uniform as far as possible, the difference Δd between the wire diameter dmaxat the longitudinal central region and the wire diameter dminat the longitudinal ends should satisfy the following limitation:in-line-formulae description="In-line Formulae" end="lead"?Δd/dmax=0.041 to 0.145.in-line-formulae description="In-line Formulae" end="tail"?

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Related U.S. Appl. No. 11/583,448, filed Oct. 19, 2006, Title: “Filament for X-Ray Tube and X-Ray Tube Having the Same”, Inventors: Masaru Kuribayashi et al; Allowed on Feb. 22, 2007.

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