JPH0511302U - X-ray tube cathode structure - Google Patents

Abstract

(57) [Summary] [Purpose] The cathode assembly of an X-ray tube has improved assembly workability and can be sealed to a metal envelope. [Construction] In the cathode assembly, two ceramic-based insulating substrates are arranged in parallel, and the two substrates are connected by a plurality of introduction lines. They are joined together, and the other insulating substrate has a portion to which the focusing electrode is attached, and one insulating substrate supports the other insulating substrate to form an integral structure. [Effect] The cathode assembling work becomes easy, and it becomes possible to seal the metal envelope.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of the cathode structure of a fixed anode X-ray tube or a rotating anode X-ray tube.

[0002]

[Prior Art]

 The cathode of a conventional X-ray tube is miniaturized by assembling the cathode using a glass button stem as a substrate as described in JP-A-57-72252.

[0003]

[Problems to be solved by the device]

 In the conventional cathode structure of an X-ray tube, which is assembled on a glass stem, the focusing electrode and filament are attached by screwing or welding. Bonding was done by glass sealing. Therefore, the present invention aims to facilitate the assembly work around the focusing electrode and to provide a cathode structure that can be sealed to a metal envelope.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, it is provided with two ceramic insulator substrates arranged in parallel, one insulator substrate is joined with a metal cylinder for sealing with the envelope, and the other insulator substrate is connected. The substrate has a unit for attaching a focusing electrode, and both insulator substrates are connected by multiple lead wires, and one insulator substrate supports the other insulator substrate.

[0005]

[Action]

 As an X-ray tube cathode assembly, a ceramic-based insulator substrate is configured in two stages, and an integrated structure in which both substrates are connected by multiple lead wires is adopted, which reduces the length in the tube axis direction and simplifies the structure. It is possible to improve the workability of assembling the electrode. Further, since it is provided with a metal cylinder for sealing, it can be applied to a fixed anode X-ray tube or a rotary anode X-ray tube provided with a metal envelope.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to FIG. FIG. 1 is an internal structure diagram of a cathode assembly showing an embodiment of the present invention. In the figure, reference numerals 1 and 2 denote circular ceramic insulating substrates. The insulating substrate 1 is joined to the adjacent envelope 3 at the outer peripheral portion and constitutes a part of the envelope. The insulating substrate 2 is supported by the insulating substrate 1 via a plurality of lead wires 8. A filament 9 is attached to the insulating substrate 2, and a focusing electrode 11 is placed on the filament 9. Insulation between the lead-in wire 8 and the insulating substrates 1 and 2 is performed by brazing the metallized portions 3 and 4 provided at the connecting portions of the insulating substrates 1 and 2 and the metal plates 6 and 7 attached to the lead-in wire 8. Fix it. The filament 9 is connected to the support 15 and attached to the insulating substrate 2, and is electrically connected to the lead-in wire 8 through the connecting wire 16. The focusing electrode 11 is fixed to the insulating substrate 2 with a small screw 10, and the electrode cover 12 is attached thereon. Further, the insulating substrate 1 and the envelope 13 are coupled to each other by air-sealing by welding the metal cylinder 14 brazed to the metallized portion 5 provided on the outer periphery of the insulating substrate 1 and the end of the envelope 13. FIG. 2 is an internal structural view of a cathode assembly showing another embodiment of the present invention. In this embodiment, the filament 9 is directly attached to the lead-in wire 8.

[0007]

[Effect of the device]

 According to the present invention, since the basic structure of the cathode assembly of the X-ray tube has an integrated structure by brazing, the electrode assembling work becomes easy and the length in the axial direction of the tube can be shortened. Since it is equipped with a metal cylinder that can be welded and sealed to a metal envelope, it is possible to obtain the effects that the conventional glass sealing work can be omitted. In addition, since a commercially available socket or the like can be used for connecting the lead-in wire and the external terminal, it is possible to obtain the effect that the conventional stem wire terminal treatment is unnecessary.

[Brief description of drawings]

FIG. 1 is an internal structural view of a cathode assembly showing an embodiment of the present invention.

FIG. 2 is an internal structural view of a cathode assembly showing another embodiment of the present invention.

[Explanation of symbols]

 1 Ceramics Insulating Substrate 2 Ceramics Insulating Substrate 3 Metallized Part 4 Metallized Part 5 Metallized Part 6 Metal Fragment 7 Metallic Fragment 8 Introducing Wire 9 Filament 10 Small Screw 11 Focusing Electrode 12 Electrode Cover

Claims (1)

[Claims for utility model registration] [Claim 1] Two ceramics-based insulating substrates arranged in parallel are provided, and one insulating substrate is joined with a metal cylinder for sealing with an envelope. , The other insulating substrate has a portion for attaching the focusing electrode, and the two insulating substrates are connected by a plurality of introducing lines, and one insulating substrate has an integral structure supporting the other insulating substrate. X-ray tube cathode structure.