Abstract:
A cathode ray tube includes a phosphor screen and an electron gun. The electron gun includes an indirectly heated cathode structure and plural grid electrodes in axially spaced relationship. The cathode structure includes a cap-shaped base metal having an electron emissive material coating and a heater for heating the cap-shaped base metal. The heater includes a major heating portion having a spirally wound heating wire and leg portions, and each of the leg portions includes a first multilayer winding portion having heating wires wound spirally in plural layers and a second multilayer winding portion intermediate between the major heating portion and the first multilayer winding portion and having heating wires wound in plural layers. The major heating portion and at least a portion of the second multilayer winding portion are covered with an insulating coating, the heater is welded to electrical conductors for applying a voltage thereto at the first multilayer winding portion, and a number of turns per unit length in the first multilayer winding portion is smaller than that in the second multilayer winding portion.
Abstract:
A filament (10) for an X-ray tube has a varied wire diameter (d) but has a constant coil outside diameter (D) 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 (12) 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 d max at the longitudinal central region and the wire diameter d min at the longitudinal ends should satisfy the following limitation: Δd / d max = 0.041 to 0.145.
Abstract translation:用于X射线管的灯丝(10)具有变化的线径(d),但是具有恒定的线圈外径(D),以获得长丝纵向温度分布的良好均匀性。 灯丝具有从纵向中心区域到纵向端部逐渐减小的线径(d),而线圈外径(D)沿着纵向被固定。 线(12)仅在线圈的内部被抛光,以减少线径。 为了使纵向温度分布尽可能均匀,纵向中心区域的线径d max与纵向端部的线径d min之差“d”应满足以下限制:“d / d max = 0.041〜0.145。
Abstract:
A filament (10) for an X-ray tube has a varied wire diameter (d) but has a constant coil outside diameter (D) 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 (12) 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 d max at the longitudinal central region and the wire diameter d min at the longitudinal ends should satisfy the following limitation: Δd / d max = 0.041 to 0.145.
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 dmax at the longitudinal central region and the wire diameter dmin at the longitudinal ends should satisfy the following limitation: Δd/dmax=0.041 to 0.145.
Abstract translation:用于X射线管的灯丝具有变化的线径,但具有恒定的线圈外径以获得长丝的纵向温度分布的良好均匀性。 灯丝具有从纵向中心区域到纵向端部逐渐减小的线径d,而线圈外径D沿着纵向方向固定。 线材只在线圈内部抛光,以减少线径。 为了使纵向温度分布尽可能均匀,在纵向中心区域的线径d max max之间的差值Deltad与线径d < 纵向端应满足以下限制:<?in-line-formula description =“In-line formula”end =“lead”?> Deltad / d sub> = 0.041 to 0.145。 <?in-line-formula description =“In-line Formulas”end =“tail”?>
Abstract:
A cathode ray tube includes a phosphor screen and an electron gun. The electron gun includes an indirectly heated cathode structure and plural grid electrodes arranged in axially spaced relationship. The cathode structure includes a base metal having an electron emissive material coating and a heater for heating the base metal. The heater includes a major heating portion having a spirally wound heating wire and a pair of leg portions connected to opposite ends of the major heating portion. The major heating portion and an inner portion of each of the leg portions on a major-heating-portion side thereof are covered with an insulating coating, and the heater is welded to electrical conductors for applying a voltage thereto at an outer portion of each of the leg portions, the outer portion not being covered with the insulating coating. The outer portion of each of the leg portions includes a first multilayer winding portion having heating wires wound spirally in plural layers, and the inner portion of each of the leg portions includes a second multilayer winding portion having heating wires wound spirally in plural layers. The number of turns per unit length in the first multilayer winding portion is smaller than that in the second multilayer winding portion.