A new cathode structure for X-ray tubes

Abstract

The present invention discloses a novel cathode structure for an X-ray tube, comprising a cathode main control grid and a single emitter grid, wherein a support bracket is arranged inside the cathode main control grid, a cathode emitter assembly is arranged above the support bracket, a cathode emitter lead is arranged at the bottom of the cathode emitter assembly, and a cathode main insulation is arranged at the bottom of the support bracket. The novel cathode structure for an X-ray tube adds bias by adding a ring-shaped voltage around the cathode emitter assembly, which can realize functions such as regulating tube current, emission area size, and rapid shutdown, uses a cathode emitter matrix emission structure, installs a structure of multiple cathode emitter leads on the cathode emitter assembly, and adds multiple different control voltages between the cathode emitter assembly and the cathode main insulation, thereby realizing a multi-point controllable emission structure, thereby realizing real-time regulation of focus and tube current.

Description

Technical Field

[0001] The invention relates to the technical field of X-ray tubes, and in particular to a novel cathode structure for an X-ray tube. Background Art

[0002] An X-ray tube is a device that generates X-rays by bombarding a target with a high-energy electron beam. It is mainly composed of a cathode, an anode, and an X-ray exit window. The cathode can emit electrons under certain conditions, and generate X-rays under high-speed electron bombardment, which are emitted through the X-ray window. Because X-rays have strong penetrating power, one of their most commonly used functions is imaging.

[0003] However, the new cathode structures of most existing X-ray tubes cannot be used for short-term exposure, and most cathode structures cannot adjust the tube current at will, cannot achieve the change of the tube current and the emission area size, and cannot be turned off quickly. The design has defects and is not convenient to use. Summary of the invention

[0004] The object of the present invention is to provide a new cathode structure for an X-ray tube to solve the problems mentioned in the above background technology that the new cathode structures of most existing X-ray tubes cannot be exposed for a short time, and most cathode structures cannot adjust the tube current at will, cannot achieve the change of the tube current and the emission area size, cannot be turned off quickly, have design defects, and are inconvenient to use.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a novel cathode structure for an X-ray tube, comprising a cathode main control grid and a single emitter grid, wherein a support bracket is arranged inside the cathode main control grid, a cathode emitter assembly is arranged above the support bracket, a cathode emitter lead is arranged at the bottom of the cathode emitter assembly, a cathode main insulation is arranged at the bottom of the support bracket, a cross bar 1 and a cross bar 2 are arranged inside the single emitter grid, an insulating support is arranged between the cross bar 1 and the cross bar 2, and a cathode emitter is fixedly installed inside the single emitter grid through the insulating support.

[0006] Preferably, the cathode emitter leads are provided with a plurality of the same, the cathode emitter assembly is rectangular, the cathode emitter leads are located at the bottom of the cathode emitter assembly and are distributed in a rectangular shape, and the cathode emitter assembly and the supporting bracket can install and fix the cathode emitter leads to prevent the cathode emitter leads from shifting.

[0007] Preferably, the bottom of the cathode emitter lead extends to the inside of the cathode main insulation, the cathode main insulation is trumpet-shaped, and the upper end of the cathode main insulation extends to the inside of the supporting bracket, and the cathode main insulation can block the rays emitted by the cathode emitter lead.

[0008] Preferably, the crossbar 1 and the crossbar 2 have the same specifications, and are staggered inside a single emitter grid. The staggered crossbar 1 and the crossbar 2 facilitate installation of insulating supports and cathode emitters.

[0009] Preferably, the number of the insulating supports and cathode emitters is the same, and the insulating supports and cathode emitters are arranged inside a single emitter grid in a matrix distribution. The cathode emitters arranged in a matrix can control the tube current size and the emitter area in real time.

[0010] Preferably, the cathode emitter assembly adopts one of a hot cathode or a cold cathode.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the new cathode structure for an X-ray tube adds a bias voltage by adding a ring-shaped voltage around the cathode emitter assembly, which can realize the functions of regulating the tube current, the size of the emission area, and rapid shutdown, etc., uses a cathode emitter matrix emission structure, installs a structure of multiple cathode emitter leads on the cathode emitter assembly, and adds multiple different control voltages between the cathode emitter assembly and the cathode main insulation, so as to realize a multi-point controllable emission structure, thereby realizing real-time regulation of the focus and the tube current, and the overall design is reasonable and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the installation structure of the cathode emitter assembly of the present invention;

[0013] Figure 2 This is a schematic diagram of the three-dimensional structure of the cathode main control grid of the present invention;

[0014] Figure 3 This is a schematic diagram of the cathode emitter installation structure of the present invention.

[0015] In the figure: 1. cathode main control grid; 2. cathode emitter assembly; 3. cathode emitter lead; 4. cathode main insulation; 5. support bracket; 6. single emitter grid; 7. crossbar one; 8. crossbar two; 9. insulation support; 10. cathode emitter. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1-3 The present invention provides a technical solution: a new cathode structure for an X-ray tube, comprising a cathode main control grid 1 and a single emitter grid 6, a support bracket 5 is arranged inside the cathode main control grid 1, a cathode emitter assembly 2 is arranged above the support bracket 5, a cathode emitter lead 3 is arranged at the bottom of the cathode emitter assembly 2, a cathode main insulation 4 is arranged at the bottom of the support bracket 5, a cross bar 1 7 and a cross bar 2 8 are arranged inside the single emitter grid 6, an insulating support 9 is arranged between the cross bar 1 7 and the cross bar 2 8, and a cathode emitter 10 is fixedly installed inside the single emitter grid 6 through the insulating support 9;

[0018] The cathode emitter leads 3 are provided with a plurality of the same, the cathode emitter assembly 2 is rectangular, the cathode emitter leads 3 are located at the bottom of the cathode emitter assembly 2 and are distributed in a rectangular shape, the bottom of the cathode emitter leads 3 extends to the inside of the cathode main insulation 4, the cathode main insulation 4 is horn-shaped, and the upper end of the cathode main insulation 4 extends to the inside of the support bracket 5, the cathode emitter assembly 2 and the support bracket 5 can install and fix the cathode emitter leads 3 to prevent the cathode emitter leads 3 from shifting;

[0019] The specifications of crossbar 1 7 and crossbar 2 8 are the same. Crossbar 1 7 and crossbar 2 8 are staggered inside a single emitter grid 6. The number of insulating supports 9 and cathode emitters 10 is the same. The insulating supports 9 and cathode emitters 10 are arranged in a matrix pattern inside a single emitter grid 6. The cathode emitter assembly 2 uses either a hot cathode or a cold cathode. The staggered crossbar 1 7 and crossbar 2 8 facilitate the installation of the insulating supports 9 and the cathode emitters 10. The cathode emitters 10 arranged in a matrix pattern can control the tube current and the emitter area in real time.

[0020] Working principle: For this type of new cathode structure of X-ray tube, the bias is added by adding a ring voltage around the cathode emitter assembly 2. In this way, the tube current, emission area, quick shutdown and other functions can be controlled. A cathode emitter 10 matrix emission structure is used, and a plurality of cathode emitter leads 3 are installed on the cathode emitter assembly 2. Multiple different control voltages are added between the cathode emitter assembly 2 and the cathode main insulation 4 to realize a multi-point controllable emission structure, thereby realizing real-time control of the focus and tube current. The overall design is reasonable and easy to use.

[0021] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel cathode structure for an X-ray tube, comprising a cathode master control grid (1) and a single emitter grid (6), characterized in that: A support bracket (5) is provided inside the cathode main control grid (1), a cathode emitter assembly (2) is provided above the support bracket (5), a cathode emitter lead (3) is provided at the bottom of the cathode emitter assembly (2), a cathode main insulation (4) is provided at the bottom of the support bracket (5), a cross bar 1 (7) and a cross bar 2 (8) are provided inside the single emitter grid (6), an insulating support (9) is provided between the cross bar 1 (7) and the cross bar 2 (8), and a cathode emitter (10) is fixedly installed inside the single emitter grid (6) through the insulating support (9); a plurality of the same cathode emitter leads (3) are provided, the cathode emitter assembly (2) is rectangular, and the cathode emitter leads (3) are located at the bottom of the cathode emitter assembly (2) and are distributed in a rectangular shape; the bottom of the cathode emitter lead (3) extends to the inside of the cathode main insulation (4), the cathode main insulation (4) is horn-shaped, and the cathode emitter leads (3) are provided at the bottom of the cathode emitter assembly (2) and are distributed in a rectangular shape; the bottom of the cathode emitter lead (3) extends to the inside of the cathode main insulation (4), the cathode main insulation (4) is horn-shaped, and the cathode emitter leads (3) are provided at the bottom of the cathode emitter assembly (2). The upper end of the cathode main insulation (4) extends to the inside of the support bracket (5); the specifications of the crossbar 1 (7) and the crossbar 2 (8) are the same, and the crossbar 1 (7) and the crossbar 2 (8) are staggered inside a single emitter grid (6); the number of the insulating support (9) and the cathode emitter (10) is the same, and the insulating support (9) and the cathode emitter (10) are arranged in a matrix inside a single emitter grid (6); the cathode emitter assembly (2) adopts one of a hot cathode or a cold cathode; by adding a ring-shaped voltage around the cathode emitter assembly, the tube current, the emission area size, and the rapid shutdown are achieved, a cathode emitter matrix emission structure is used, a structure with multiple cathode emitter leads is installed on the cathode emitter assembly, and multiple different control voltages are added between the cathode emitter assembly and the cathode main insulation to achieve a multi-point controllable emission structure, thereby achieving real-time control of the focus and tube current, and the overall design is reasonable and easy to use.

Images