Mechanical installation structure of small electron multiplier

Abstract

The utility model relates to a mechanical installation structure of a small electron multiplier. The mechanical installation structure is composed of a shell, a photomultiplier plate, a pressing plate, a protection cover and an insulation screw. The shell comprises a middle circular hollow area and an embedded area; the photomultiplier plate is fastened with a photomultiplier plate mounting screw hole in the bottom wall of the embedded region through an insulating screw; the pressing plate is placed at the upper part of the photomultiplier plate and is fastened with the pressing plate screw holes in the bottom wall of the embedded area through insulating screws; and the protective cover is fastened with the protective cover mounting screw holes in the outer side of the step avoiding part of the embedded area through insulating screws. The mechanical installation structure of the small-sized electron multiplier is simple in design and small in size, can be installed in a narrow detection space, and meets the requirements of special fields requiring electronic amplification. And an innovative voltage applying design is adopted, so that the problem of applying voltage to the photomultiplier plate which is low in thickness and brittle in material is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of vacuum electron devices, mainly applied to the electron multiplier of ion detection device in vacuum environment such as mass spectrometer, and specifically relates to a mechanical mounting structure of small electron multiplier, which is simple in design, small in size, and uses innovative voltage application design to solve the problem of applying voltage to a photoelectric multiplication plate with low thickness and fragile material. BACKGROUND

[0002] An electron multiplier mainly generates a large number of gain secondary electrons after some special materials are bombarded by high-energy charged particles (cations), and the electrons can reach the purpose of amplifying the micro-impact signal after being amplified through a small channel. The small channel plate (MCP), which is the core component of the electron multiplier, is a channel-type photoelectric multiplication plate, usually made of glass thin plate as a substrate and prepared by atomic layer deposition technology. The shape is a glass round thin sheet that has collected millions of fine parallel hollow tubes. The thickness of the sheet is 0.1mm to several millimeters, and lead-free glass is the main material of the photoelectric multiplication plate. Compared with ordinary glass, lead-free glass has the advantages of good light refraction, impact resistance, high hardness, and no toxicity, and is widely used in optoelectronic devices. At the same time, the photoelectric multiplication plate has the characteristics of low voltage, high resolution, light weight, and small noise, and belongs to a special optical fiber device. In the mechanical structure, it is necessary to ensure that the direct current voltage value applied to both ends of the photoelectric multiplication plate is stable, so as to maintain the low-to-high electron acceleration electric field at both ends of the photoelectric multiplication plate to release more secondary amplified electrons. In the mechanical design, it is necessary to fully consider the installation operability in a narrow space, as well as the stability and safety of the circuit conduction on both sides of the photoelectric multiplication plate. At the same time, due to the characteristics of thin thickness and easy breakage of the photoelectric multiplication plate, the fixation of the photoelectric multiplication plate needs to be fully considered in the mechanical structure design of the fixing part.

[0003] In the current electron multiplier, the part for fixing the photoelectric multiplication plate is mainly a mechanical structure. In the mechanical structure design, the main difficulty is to balance the contact between the surface of the photoelectric multiplication plate and the metal part to ensure the stability of the voltage, and the fixation of the photoelectric multiplication plate in the structure. The process of applying voltage provides a stable electron acceleration electric field for the photoelectric multiplication plate, and too tight fixation of the fixing part will cause the photoelectric multiplication plate to break.

[0004] Therefore, there is an urgent need in the prior art to solve the problem of how to avoid damage to the photoelectric multiplication plate in the mechanical structure design of the fixing part due to the characteristics of thin thickness and easy breakage of the photoelectric multiplication plate. SUMMARY

[0005] The utility model discloses a mechanical mounting structure of small -size electronic multiplier, be used to solve the problem that the surface of the photoelectric multiplication board and the metal part need contact guarantee voltage stability and the fixation of photoelectric multiplication board in the structure of the existing difficult balance.

[0006] In order to solve the above problem, the utility model provides a kind of mechanical mounting structure of small -size electronic multiplier, by shell, photoelectric multiplication board, pressing plate, protective cover, insulating screw composition.

[0007] Shell includes middle circular hollow area and embedded area;Embedded area is located at the top area of shell, including front wall, back wall and the bottom wall connecting front wall and back wall, bottom wall central region is provided with through hole passing through central area, the both sides of through hole are sequentially provided with photoelectric multiplication board mounting screw hole and pressing plate mounting screw hole;Bottom wall is close to the both sides of outer circumferential of shell and is provided with avoiding step portion;

[0008] Photoelectric multiplication board is provided with first light hole, for passing through photoelectric multiplication board insulating screw;

[0009] Pressing plate middle part is provided with the mounting embedded part of photoelectric multiplication board contour adaptation, and the both sides of mounting embedded part are provided with second light hole, for passing through pressing plate insulating screw;

[0010] Protective cover covers the outer periphery of embedded area, and the both ends of protective cover are located in the step avoiding portion of the bottom wall both sides of embedded area, and protective cover mounting screw hole is arranged outside step avoiding portion;

[0011] Photoelectric multiplication board is fastened between the bottom wall of embedded area and the photoelectric multiplication board mounting screw hole of embedded area through insulating screw;Pressing plate is placed on the upper part of photoelectric multiplication board, and pressing plate is fastened between the bottom wall of embedded area and the pressing plate screw hole of embedded area through insulating screw;Protective cover is fastened between the step avoiding portion of embedded area and the protective cover mounting screw hole outside step avoiding portion of embedded area through insulating screw.

[0012] The utility model has the advantages of:

[0013] (1) simple structure design: the mechanical mounting structure of small -size electronic multiplier of the utility model is composed of photoelectric multiplication board, insulating screw, pressing plate, protective cover and other parts by careful design of assembly and assembly mode, realizes the simplification of structure.This simplification not only reduces the number of parts, reduces manufacturing cost, but also makes the whole installation process more quickly and conveniently.Simplified structure also brings the convenience of maintenance, because fewer parts mean fewer potential failure points, thereby reducing maintenance workload and cost.In addition, simplified design also helps to improve the reliability of product, to ensure stable operation in the whole service life.

[0014] (2) Compact size: The mechanical mounting structure of the small-sized electron multiplier of the present utility model pays special attention to the optimization of volume, so that it can adapt to various narrow detection spaces. This compact size design makes the electron multiplier can be easily integrated into various compact devices, such as portable detection devices or space-limited industrial applications. The compact size also helps to reduce the weight of the overall device, which is particularly important for devices that need to be moved or carried. In addition, the compact design also means that less space is required during installation.

[0015] (3) Innovative voltage application design: The present utility model effectively solves the challenge of applying voltage to thin and fragile photomultiplier plates through innovative voltage application design. This design ensures the stable application of voltage, thereby maintaining the low-to-high electron acceleration electric field across the photomultiplier plate, which is crucial for releasing more secondary amplified electrons. In addition, the physical characteristics of the photomultiplier plate are also considered to avoid damage caused by improper voltage application. This innovative voltage application method not only improves the performance of the electron multiplier, but also enhances its applicability and reliability in various applications. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present utility model, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0017] Figure 1 Explosive diagram of the mechanical mounting structure of the small-sized electron multiplier in the embodiment of the present utility model Figure 1 ;

[0018] Figure 2 Explosive diagram of the mechanical mounting structure of the small-sized electron multiplier in the embodiment of the present utility model Figure 2 ;

[0019] Figure 3 Explosive diagram of the mechanical mounting structure of the small-sized electron multiplier in the embodiment of the present utility model Figure 3 ;

[0020] Figure 4 Explosive diagram of the mechanical mounting structure of the small-sized electron multiplier in the embodiment of the present utility model Figure 4 ;

[0021] Figure 5 Structure diagram of the shell of the small-sized electron multiplier in the embodiment of the present utility model.

[0022] Explanation of reference signs:

[0023] 1-Outer shell, 2-Photomultiplier plate, 3-Pressure plate, 4-Protective cover, 5-Central circular hollow area, 6-Embedded area, 7-Front wall, 8-Rear wall, 9-Bottom wall, 10-Through hole, 11-Photomultiplier plate mounting screw hole, 12-Pressure plate screw hole, 13-Avoiding step, 14-First light hole, 15-Mounting embedding part, 16-Second light hole, 17-Protective cover mounting screw hole. Detailed Implementation

[0024] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0025] To fully understand this utility model, detailed steps and structures will be presented in the following description to illustrate the technical solution of this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0026] like Figures 1 to 5 The mechanical mounting structure of a small electron multiplier shown in this utility model consists of a shell 1, a photomultiplier plate 2, a pressure plate 3, a protective cover 4, and insulating screws.

[0027] The outer casing 1 includes a central circular hollow area 5 and an embedded area 6; the embedded area 6 is located in the top area of ​​the outer casing and includes a front wall 7, a rear wall 8 and a bottom wall 9 connecting the front wall and the rear wall. The bottom wall 9 has a through hole 10 in the center that passes through the central area. On both sides of the through hole 10, there are photomultiplier plate mounting screw holes 11 and pressure plate mounting screw holes 12 in sequence; the bottom wall has clearance steps 13 on both sides near the outer periphery of the outer casing.

[0028] The photomultiplier plate 2 is provided with a first light hole 14 for passing through the photomultiplier plate insulating screw;

[0029] The middle part of the pressure plate 3 is provided with a mounting and embedding part 15 that is adapted to the shape of the photomultiplier plate 2. The mounting and embedding part 15 is provided with second light holes 16 on both sides for passing through the pressure plate insulating screws.

[0030] The protective cover 4 covers the outer periphery of the embedded area 6. The two ends of the protective cover 4 are located on the stepped clearance parts 13 on both sides of the bottom wall 9 of the embedded area. The outer side of the stepped clearance parts 13 is provided with protective cover mounting screw holes 17.

[0031] The shell of the electron multiplier adopts a hollow plus embedded design. The middle circular hollow area 5 is a passage for amplified secondary electrons. After passing through the passage, the electrons enter the signal collection area. In the embedded area 6 of the shell and a series of fixing members. The embedded area 6 is provided with a photomultiplier plate 2, a pressing plate 3 and a protective cover 4.

[0032] The photomultiplier plate 2 is fastened between the photomultiplier plate mounting screw hole 11 of the bottom wall 9 of the embedded area 6 and the insulating screw. Then the pressing plate 3 is placed on the upper part of the photomultiplier plate, and the pressing plate 3 is fixed between the pressing plate screw hole 12 of the bottom wall 9 of the embedded area 6 and the insulating screw by the same principle.

[0033] In another aspect, the power supply design of the photomultiplier plate 2 adopts a unique shell power supply. First, the wire is fastened on the stainless steel shell by a screw. In addition, the pressing plate 3 is also fixed on the upper surface of the plate by an insulating screw to supply power to the pressing plate 3. The lower part of the pressing plate is the photomultiplier plate, which serves as a power supply for the upper surface of the photomultiplier plate. The lower surface of the photomultiplier plate is the shell.

[0034] In order to realize the potential difference of the photomultiplier plate and make the electrons accelerate to impact the inner wall of the fine parallel hollow tube to generate more secondary electrons, a voltage needs to be applied to the lower surface of the photomultiplier plate. In the design, the shell in contact with the lower surface of the photomultiplier plate adopts a square design, and one side end face is designed with a wire fixing position.

[0035] The protective cover 4 covers the outer periphery of the embedded area 6, and the two ends of the protective cover are located in the step avoiding parts 13 on both sides of the embedded area bottom wall 9. The step avoiding parts are provided with protective cover mounting screw holes 17, and the protective cover 4 is fixed to the shell 1 by screws. In order to ensure the space tightness and eliminate other stray electron interference, the protective cover 4 needs to be finally fixed to the shell 1.

[0036] Preferably, the shell 1 is circular, square or oval.

[0037] Preferably, the threaded part of the insulating screw is coated with an insulating coating to enhance its insulating performance.

[0038] Preferably, the surface of the photomultiplier plate 2 is covered with an anti-reflection film to reduce light reflection and improve photoelectric conversion efficiency.

[0039] Preferably, the surface of the photomultiplier plate 2 is treated as a frosted or textured surface to reduce light reflection and improve photoelectric conversion efficiency.

[0040] Preferably, the bottom wall 9 of the embedded area 6 of the shell 1 is provided with a plurality of reinforcing ribs to enhance the stability of the structure.

[0041] Preferably, the adjacent surfaces of the shell 1 are transitioned by a round corner.

[0042] The preferred embodiments of the present application are described above. It should be understood that the present application is not limited to the specific embodiments described above, wherein the devices and structures not described in detail should be understood as being implemented in the ordinary way in the art; any person skilled in the art, without departing from the scope of the technical scheme of the present application, can make many possible changes and modifications to the technical scheme of the present application by using the disclosed technical content, or modify it into equivalent embodiments with equivalent changes, which does not affect the essential content of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the content of the technical scheme of the present application, still belongs to the scope of protection of the technical scheme of the present application.

Claims

1. A mechanical mounting structure for a compact electron multiplier, characterized by, It is composed of a shell (1), a photomultiplier plate (2), a pressing plate (3), a protective cover (4), and an insulating screw. The shell (1) comprises a middle circular hollow area (5) and an embedded area (6). The embedded area (6) is located at the top area of the shell and comprises a front wall (7), a back wall (8), and a bottom wall (9) connecting the front wall and the back wall. A through hole (10) is arranged in the center of the bottom wall (9). On both sides of the through hole (10), a photomultiplier plate mounting screw hole (11) and a pressing plate screw hole (12) are arranged in sequence. Step avoiding parts (13) are arranged on both sides of the bottom wall close to the outer periphery of the shell. A first light hole (14) is arranged on the photomultiplier plate, which is used for passing through the insulating screw of the photomultiplier plate. A mounting embedded part (15) with the same shape as the photomultiplier plate (2) is arranged in the middle of the pressing plate (3). Second light holes (16) are arranged on both sides of the mounting embedded part (15), which are used for passing through the insulating screw of the pressing plate. The protective cover (4) covers the outer periphery of the embedded area (6). Both ends of the protective cover (4) are located at the step avoiding parts (13) on both sides of the bottom wall (9) of the embedded area. Protective cover mounting screw holes (17) are arranged outside the step avoiding parts (13). The photomultiplier plate (2) is fastened between the photomultiplier plate mounting screw hole (11) of the bottom wall (9) of the embedded area and the insulating screw. The pressing plate (3) is placed on the upper part of the photomultiplier plate (2) and is fastened between the pressing plate screw hole (12) of the bottom wall (9) of the embedded area and the insulating screw. The protective cover (4) is fastened between the protective cover mounting screw hole (17) outside the step avoiding part (13) of the embedded area and the insulating screw.

2. A mechanical mounting structure for a small electron multiplier according to claim 1, characterized by The surface of the photomultiplier plate (2) is coated with an anti-reflection film.

3. A mechanical mounting structure for a small electron multiplier according to claim 2, wherein The shell (1) is circular, square, or elliptical.

4. A mechanical mounting structure for a small electron multiplier according to claim 3, wherein The bottom wall (9) of the embedded area (6) of the shell (1) is provided with multiple reinforcing ribs.

5. A mechanical mounting structure for a small electron multiplier according to claim 4, wherein The insulating screw is coated with an insulating coating.

6. A mechanical mounting structure for a small electron multiplier according to claim 5, wherein The adjacent surfaces of the shell (1) are connected by a rounded corner.

7. A mechanical mounting structure for a small electron multiplier according to claim 6, wherein The surface of the photomultiplier plate (2) is treated as a frosted or textured surface.

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