CN210837647U

CN210837647U - Side window type ray tube

Info

Publication number: CN210837647U
Application number: CN201922259340.7U
Authority: CN
Inventors: 刘骏; 王刘成; 张伟
Original assignee: Wuxi Unicomp Technology Co ltd
Current assignee: Wuxi Unicomp Technology Co ltd
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-06-23
Anticipated expiration: 2029-12-17

Abstract

The utility model belongs to the technical field of the ray tube technique and specifically relates to a side window type ray tube, including shell, negative pole, anode and beryllium window, the anode penetrates and is fixed with the shell from one side of shell, the opposite side at the shell is fixed to the negative pole, anode and negative pole are in on the same water flat line, and the beryllium window is installed on the shell lateral wall with anode vertically, and the glass window is relative with the positive pole target surface, the utility model discloses can solve the problem that X ray emission angle is restricted in the end window type pipe among the prior art.

Description

Side window type ray tube

Technical Field

The utility model relates to a ray tube technical field, specific field is a side window type ray tube.

Background

SMT (surface mount technology) is the most popular and widely applied technology in the electronic assembly industry at present, and the electronic product can be reduced by 40-60% in volume and 60-80% in weight by using the SMT technology. The microfocus X-ray tube is widely applied to SMT detection, generally, an end window type tube is applied to the X-ray tube, an included angle of 90 degrees is formed between a cathode and an anode, a beryllium window is arranged at one end of the anode, X-rays are filtered and emitted from the beryllium window, and the size of the beryllium window is smaller than that of the end face of a tube shell because a glass window is arranged on the tube shell, so that the emission angle of the X-rays can be limited, the detection area during working is limited, and the detection efficiency is low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a side window type ray tube to solve among the prior art problem that X ray emission angle is restricted in the end window type pipe.

In order to achieve the above object, the utility model provides a following technical scheme: a side window type ray tube comprises a shell, a cathode, an anode and a beryllium window, wherein the anode penetrates into the shell from one side and is fixed with the shell, the cathode is fixed at the other side of the shell, the anode and the cathode are positioned on the same horizontal line, the beryllium window is arranged on the side wall of the shell vertical to the anode, and a glass window is opposite to an anode target surface.

Preferably, the housing is integrally formed by glass, the housing is composed of a large cylinder and a small cylinder which are coaxial, the cathode is arranged in the cylinder with the smaller diameter, and the beryllium window and the anode are arranged on the cylinder with the larger diameter.

Preferably, the cathode is composed of a plurality of layers of gradations, and the electron beams are gathered by the plurality of layers of gradations to form fine electron beams which bombard on the anode target surface to form micro-focal spots.

Preferably, the cathode is composed of five layers of sheets, and the five layers of sheets sequentially comprise a public end level, a grid control level, an acceleration level, a focusing A level and a focusing B level from left to right.

Compared with the prior art, the beneficial effects of the utility model are that: the beryllium window is arranged on the side wall of the shell, the size and the position are not limited, a large transmission angle can be formed, and the detection efficiency is improved; the cathode is composed of multiple layers of sheets, can provide electron beams which are fine enough, can excite a focal spot of several micrometers on the target surface of the anode, and is stable in detection process and reliable in detection result.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1 anode, 2 cathode, 3 outer shell, 4 beryllium window.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a side window type ray tube comprises a shell 3, a cathode 2, an anode 1 and a beryllium window 4, wherein the anode 1 penetrates from one side of the shell 3 and is fixed with the shell 3, the cathode 2 is fixed at the other side of the shell 3, the anode 1 and the cathode 2 are positioned on the same horizontal line, the beryllium window 4 is arranged on the side wall of the shell 3 vertical to the anode 1, a glass window is opposite to an anode target surface, concretely, the shell 3 is integrally formed by glass materials, the shell 3 consists of a large cylinder and a small cylinder which are coaxial, the cathode 2 is arranged in the cylinder with a small diameter, the beryllium window 4 and the anode 1 are arranged on the cylinder with a large diameter, the beryllium window 4 is arranged on the side wall of the shell 3, the size and the position of the beryllium window are not limited any more, a large reflection angle can be formed for detecting an object, the detection area is not limited any more during the.

Preferably, the cathode 2 is composed of a plurality of stages, the electron beam is gathered by the plurality of stages to form a fine electron beam to bombard on the anode target surface to form a micro focal spot, wherein each stage is provided with a lead led out from an electrode and can independently control current and voltage, concretely, in the embodiment, the cathode 2 is composed of five stages, the five stages are sequentially provided with a common end stage, a grid control stage, an acceleration stage, a focusing A stage and a focusing B stage from left to right, wherein the common end stage is used as the common stage of the five stages to enable the five stages to become a large lens to integrally act, a small hole is arranged in the middle of the grid control stage to control the size of the electron beam and prevent high-speed electrons from impacting the pipe wall, the acceleration stage provides an acceleration when the electron beam passes through the central small hole under the control of external voltage, the focusing A stage and the focusing B stage focus the electron beam to the micro-scale to impact the anode target, the cathode 2 is composed of multiple layers of sheets, can provide electron beams which are thin enough, can excite a focal spot of several micrometers on the anode target surface, and is stable in detection process and reliable in detection result.

The working process is as follows: applying high voltage between the cathode 2 and the anode 1, leading electron beams to be drawn by the cathode 2 and bombarded on an anode target surface to form X rays, filtering the X rays by the beryllium window 4, and detecting an object; the cathode 2 is composed of a plurality of stages, the electron beam is focused by the plurality of stages and finally bombarded on the target surface by the superfine electron beam to form a focal spot of several micrometers.

According to the detection device, the beryllium window 4 is arranged on the side wall of the shell 3, the size and the position of the beryllium window 4 are not limited, a large transmission angle can be formed, and the detection efficiency is improved; the cathode 2 is composed of multiple layers of sheets, can provide electron beams which are thin enough, can excite a focal spot of several micrometers on the anode target surface, and is stable in detection process and reliable in detection result.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A side-window type ray tube comprising a housing (3), a cathode (2), an anode (1) and a beryllium window (4), characterized in that: the anode (1) penetrates from one side of the shell (3) and is fixed with the shell (3), the cathode (2) is fixed on the other side of the shell (3), the anode (1) and the cathode (2) are positioned on the same horizontal line, the beryllium window (4) is installed on the side wall of the shell (3) vertical to the anode (1), and the glass window is opposite to the target surface of the anode (1).

2. A side window type ray tube according to claim 1, wherein: the shell (3) is made of glass materials and is integrally formed, the shell (3) is composed of a large cylinder and a small cylinder which are coaxial, the cathode (2) is installed in the cylinder with the small diameter, and the beryllium window (4) and the anode (1) are arranged on the cylinder with the large diameter.

3. A side window type ray tube according to claim 1, wherein: the cathode (2) is composed of a plurality of layers of graded sheets, and electron beams are gathered by the plurality of layers of graded sheets to form fine electron beams which bombard on the target surface of the anode (1) to form micro focal spots.

4. A side window type ray tube according to claim 3, wherein: the cathode (2) is composed of five layers of cascade plates, and the five layers of cascade plates are a public end stage, a grid control stage, an acceleration stage, a focusing A stage and a focusing B stage from left to right in sequence.