Movable vacuum Dewar cold shield

Abstract

The utility model relates to the technical field of infrared refrigeration detectors, and particularly discloses a movable vacuum Dewar cold shield which comprises a cold shield body, a plurality of connecting pieces and screws. The connecting pieces are arranged on the periphery of the cold shield body in a surrounding mode. A large hole and a small hole are formed in the connecting piece; the large holes are communicated with the small holes; the aperture of the large hole is greater than the width of the small hole; the aperture of the large hole is larger than the diameter of the end of the screw; the width of the small hole is smaller than the diameter of the end of the screw; the screws are used for partially penetrating through the small holes and then pressing and fixing the connecting pieces through the ends. When the cold shield main body is installed, a screw can penetrate into the small hole and then is tightened. When the cold shield body is disassembled, the cold shield body is rotated after the screw is unscrewed so that the large hole can be aligned with the screw, and then the cold shield body can be taken down. The screws do not need to be completely taken down in the dismounting process, and the dismounting complexity of the Dewar cold shield can be effectively reduced.

Description

Technical Field

[0001] This application relates to the technical field of infrared refrigeration detectors, and particularly to a movable vacuum Dewar cold shield. Background Art

[0002] Infrared focal plane detectors have the advantages of high sensitivity, good environmental adaptability, strong anti-interference ability, light weight, low power consumption, etc., and are widely used in fields such as aerospace infrared remote sensing, national defense, meteorology, environment, medicine, and scientific instruments. In the field of monochromatic detection, indium antimonide (InSb) focal plane detectors have advantages in terms of production cost, pixel uniformity, and consistency.

[0003] Indium antimonide infrared focal plane detectors are temperature-sensitive devices, and their performance is affected by their operating temperature. For devices in the infrared band, their performance at room temperature cannot meet the application requirements or even cannot work, so they often need to be refrigerated and the operating temperature needs to be kept stable. Therefore, a suitable packaging structure needs to be adopted and the operating temperature of the device needs to be precisely measured and controlled.

[0004] Indium antimonide infrared focal plane detectors are commonly packaged with Dewar cold shields. In a refrigerated infrared imaging system, the cold shield is a component that prevents stray energy outside the field of view from reaching the detector image plane and improves the temperature sensitivity of the system's response to the target. It can reduce the device background noise and improve the signal-to-noise ratio. When installing the Dewar cold shield, the existing method is generally to use glue for bonding, making its disassembly and assembly process complex. Summary of the Utility Model

[0005] In view of this, the purpose of this application is to provide a movable vacuum Dewar cold shield to solve the problem of complex disassembly and assembly of the existing Dewar cold shield.

[0006] To achieve the above technical purpose, this application provides a movable vacuum Dewar cold shield, including: a cold shield body, a plurality of connecting pieces, and screws;

[0007] The connecting pieces are arranged around the outer periphery of the cold shield body;

[0008] The connecting pieces are provided with large holes and small holes;

[0009] The large holes and the small holes are communicated with each other;

[0010] The aperture of the large hole is larger than the width of the small hole;

[0011] The aperture of the large hole is larger than the end diameter of the screw;

[0012] The width of the small hole is smaller than the end diameter of the screw;

[0013] The screws are used to partially pass through the small holes and then press and fix the connecting pieces through the ends.

[0014] Further, the small holes are strip-shaped holes.

[0015] Further, the connecting pieces are arranged at the bottom of the outer periphery of the cold shield body.

[0016] Further, the connecting pieces are provided with conductive holes penetrating in the vertical direction;

[0017] The conductive holes are used for dropping conductive glue.

[0018] Further, the cold shield body is provided with exhaust holes;

[0019] The exhaust holes are communicated with the inside of the cold shield body.

[0020] Further, a positioning groove is provided at the top of the cold shield body;

[0021] The positioning groove is used for installing a filter;

[0022] The positioning groove is provided with light-transmitting holes.

[0023] As can be seen from the above technical solutions, the present application provides a movable vacuum dewar cold shield, including: a cold shield body, a plurality of connecting pieces and screws; the connecting pieces are arranged around the outer periphery of the cold shield body; the connecting pieces are provided with large holes and small holes; the large holes and the small holes are communicated with each other; the aperture of the large holes is larger than the width of the small holes; the aperture of the large holes is larger than the diameter of the end of the screw; the width of the small holes is smaller than the diameter of the end of the screw; the screws are used for partially passing through the small holes and then pressing and fixing the connecting pieces through the ends.

[0024] When installing the cold shield body, the screws can be inserted into the small holes and then tightened; when disassembling the cold shield body, after loosening the screws, the cold shield body is rotated so that the large holes are aligned with the screws, and then the cold shield body can be removed; during the disassembly process, it is not necessary to completely remove the screws, which can effectively reduce the complexity of the disassembly and assembly of the dewar cold shield. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic diagram of the overall structure of a movable vacuum dewar cold shield provided by an embodiment of the present application;

[0027] In the figure: 10, cold screen main body; 11, exhaust hole; 12, positioning groove; 13, light-transmitting hole; 20, connecting piece; 21, large hole; 22, small hole; 23, conductive hole. Detailed implementation mode

[0028] The technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the specification of the present application without creative efforts belong to the scope claimed by the present application.

[0029] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0030] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a replaceable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0031] Please refer to Figure 1 , a live vacuum dewar cold screen provided in the embodiments of the present application includes: a cold screen main body 10, a plurality of connecting pieces 20 and screws.

[0032] The connecting pieces 20 are arranged around the outer periphery of the cold screen main body 10. In this embodiment, there are two connecting pieces 20, and they are symmetrically distributed with respect to the cold screen main body 10. In practical applications, the connecting pieces 20 can be welded to the cold screen main body 10 by welding. The side of the connecting piece 20 away from the cold screen main body 10 can be an arc structure.

[0033] In this embodiment, a large hole 21 and a small hole 22 are provided on the connecting piece 20; the large hole 21 and the small hole 22 communicate with each other; the aperture of the large hole 21 is larger than the width of the small hole 22; the aperture of the large hole 21 is larger than the end diameter of the screw; the width of the small hole 22 is smaller than the end diameter of the screw; the screw is used to partially pass through the small hole 22 and then press and fix the connecting piece 20 through the end.

[0034] Specifically, when initially installing the cold screen body 10, after aligning the cold screen body 10 with the installation position on the installation surface, use a screw to pass through the small hole and tighten the screw until the end of the screw abuts against the connecting piece 20, then the cold screen body 10 can be pressed and fixed on the installation surface through the connecting piece 20.

[0035] When it is necessary to disassemble the cold screen, loosen the screw until the cold screen body 10 can rotate, then rotate the cold screen body 10 so that the large hole 21 is located below the end of the screw, and then move the cold screen body 10 upward to drive the screw to pass through the large hole 21 and separate from the connecting piece 20, realizing the disassembly of the cold screen body 10.

[0036] When reinstalling the cold screen body 10, align the multiple large holes 21 on the multiple connecting pieces 20 with the multiple screws one by one, then move the cold screen body 10 downward so that the end of the screw passes through the large hole, and then rotate the cold screen body 10 so that the end of the screw comes above the small hole 22, and then the screw can be rotated to press and fix the connecting piece 20.

[0037] The active vacuum dewar cold screen provided in this embodiment can quickly install the cold screen body 10 through the cooperation of screws, large holes and small holes. At the same time, after subsequent disassembly and assembly, the screws do not need to be removed, which can avoid the loss of screws, improve the disassembly and assembly efficiency, and reduce the complexity of disassembly and assembly.

[0038] As a further improvement, the small hole 22 is a strip-shaped hole, which can increase the rotation range of the cold screen body 10 after rotation during installation, and at the same time increase the distance between the screw and the large hole 21 when the screw is installed on the small hole 22.

[0039] Optionally, the connecting piece 20 is arranged at the bottom of the outer periphery of the cold screen body 10.

[0040] In one embodiment, a conductive hole 23 penetrating in the vertical direction is provided on the connecting piece 20; the conductive hole 23 is used for dripping conductive glue.

[0041] When an insulating layer is provided on the surfaces of the cold screen body 10 and the connecting piece 20 and they cannot be grounded, the conductive glue can conduct the cold screen body 10 and the underlying ceramic substrate.

[0042] Furthermore, an exhaust hole 11 is provided on the cold screen body 10; the exhaust hole 11 communicates with the inside of the cold screen body 10.

[0043] When the Dewar is exhausted, the exhaust hole 11 can keep the air pressure inside and outside the cold shield main body 10 consistent.

[0044] Furthermore, a positioning groove 12 is provided at the top of the cold shield main body 10; the positioning groove 12 is used for installing a filter; a light-transmitting hole 13 is provided on the positioning groove 12.

[0045] The light-transmitting hole 13 can allow light to enter the inside of the cold shield main body 10 through the filter to irradiate the internal chip. At the same time, the filter can be prevented from being broken during exhaust through the exhaust hole 11.

[0046] The above are the preferred embodiments of the present application and are not used to limit the present utility model. Although the present application has been described in detail with reference to the examples, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing examples, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A living vacuum Dewar cold shield, characterized in that, Comprising: A cold screen body (10), a plurality of connecting pieces (20) and screws; The connecting pieces (20) are arranged around the outer periphery of the cold screen body (10); The connecting pieces (20) are provided with large holes (21) and small holes (22); The large holes (21) and the small holes (22) communicate with each other; The aperture of the large holes (21) is larger than the width of the small holes (22); The aperture of the large holes (21) is larger than the end diameter of the screws; The width of the small holes (22) is smaller than the end diameter of the screws; The screws are used to partially pass through the small holes (22) and then press and fix the connecting pieces (20) through the ends.

2. The living vacuum Dewar cold shield according to claim 1, wherein, The small holes (22) are strip-shaped holes.

3. The active vacuum dewar cold shield according to claim 1, characterized in that, The connecting pieces (20) are arranged at the bottom of the outer periphery of the cold screen body (10); 4. The live vacuum dewar cold shield according to claim 3, characterized in that, The connecting pieces (20) are provided with conductive holes (23) penetrating in the vertical direction; The conductive holes (23) are used for dripping conductive glue.

5. The live vacuum dewars cold shield according to claim 1, characterized in that, The cold screen body (10) is provided with exhaust holes (11); The exhaust holes (11) communicate with the inside of the cold screen body (10); 6. The living vacuum dewar cold screen according to claim 5, characterized in that, A positioning groove (12) is provided at the top of the cold screen body (10); The positioning groove (12) is used for installing a filter; The positioning groove (12) is provided with a light-transmitting hole (13).

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