Dewar electrical lead structure for large array infrared detector assembly

Abstract

The application discloses a kind of for big face array infrared detector component dewar electrical lead structure.In the electrical lead structure of infrared component dewar, mainly by connector, dewar shell, flexible band line, band line fixing frame, fixed pressing strip, lead wire is composed.This patent introduces a kind of electrical lead structure in the dewar packaging process of big face array infrared detector component, the characteristics of different lead modes can be prepared using the both ends of flexible band line, realize the lead transition connection between connector and big face array infrared module of infrared detector.Solve the problem that big face array infrared module in dewar cannot be directly bonded to the connector on dewar shell.The lead structure is less affected to the heat leakage under the condition of dewar refrigeration working state under the premise of guaranteeing mechanical reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of infrared photoelectric detection, in particular to an electrical lead structure of a large-array infrared detector Dewar assembly, which is suitable for electrical lead-out of various large-scale infrared detector assemblies such as large-array and long-line-array infrared detector assemblies. BACKGROUND

[0002] Refrigeration-type infrared detector assemblies are widely used in the field of spaceborne infrared detection, and the detection performance of infrared sensors is an important technical index of high-spatial-resolution infrared remote sensing instruments. With the increasing demand for spaceborne application of infrared photoelectric detector technology and the continuous improvement of infrared detector technology, the scale of infrared detector arrays is continuously expanding, and the structure size is also continuously increasing. The traditional packaging structure of miniature infrared detectors cannot meet the application requirements of large-array infrared detector packaging. Large-array infrared detectors need to be packaged in Dewars and thermally connected with refrigerators to ensure that the large-array infrared detector chips work in a low-temperature environment by using the high-vacuum insulation principle of the Dewar. The thermal load of the Dewar is a comprehensive index representing the insulation capacity of the Dewar, and its size is an important index for measuring the refrigerator. When the thermal load increases to a certain extent, the cooling capacity provided by the mechanical refrigerator cannot meet the requirements of deep low-temperature work of the large-array infrared detector, so the large-array infrared detector cannot work at the required temperature point, and the residual gas in the Dewar will condense on the surface of the detector, causing the performance of the large-array detector to degrade or even be lost, thereby causing the high-spatial-resolution infrared remote sensing instrument to malfunction. Therefore, it is urgent to develop a large-array infrared detector Dewar assembly with low thermal load and high vacuum.

[0003] The infrared detector large-array infrared module in the Dewar cannot be directly bonded and led out to the connector on the Dewar shell, and the traditional Dewar design is to fix the wires in the Dewar to the cold head of the Dewar, i.e. to the cold end of the Dewar. Such packaging method will cause a part of the cooling capacity of the refrigerator to be transferred to the lead connector through the wires when the refrigerator is cooling the infrared detector, and the lead connector is generally on the room-temperature Dewar shell assembly, which will increase the thermal load of the large-array Dewar assembly, and further increase the power consumption of the refrigerator. In summary, in order to solve the problem that the large-array infrared module cannot be directly bonded and led out to the connector, and to reduce the thermal load of the large-array infrared detector, an electrical lead structure of a large-array infrared detector Dewar assembly is urgently needed. SUMMARY

[0004] The application aims to provide a large-array infrared detector assembly Dewar electrical lead structure, which realizes the lead transition connection between the connector and the large-array infrared module of the infrared detector by utilizing the characteristics of the flexible ribbon line that can be prepared in different lead modes.

[0005] The application has the structure as shown in the figure Figure 1 The application has the structure as shown in the figure

[0006] The application has the structure as shown in the figure Figure 1 The application has the structure as shown in the figure

[0007] The connector 1 is made of Kovar metal, the internal metal pin 101 is formed by glass bead airtight sintering, and the size of the side welding edge 102 is adapted to the welding edge 201 of the Dewar shell 2.

[0008] The Dewar shell 2 is made of Kovar metal and is prepared by machining, the size of the welding edge 201 of the Dewar shell 2 is 0.02mm-0.06mm larger than the size of the welding edge 102 of the connector 1, and the size of the welding edge 202 of the Dewar shell 2 is 0.02mm-0.06mm larger than the size of the welding edge 401 of the ribbon line fixing frame 4.

[0009] The flexible ribbon line 3 is made of constantan and is prepared by customized machining, the thickness is 0.1mm-0.2mm, and the flexible ribbon line 3 has the bonding point 301, the welding hole 302 and the two mounting holes 303.

[0010] The ribbon line fixing frame 4 is made of Kovar metal, has an arch bridge structure, the thickness is 2mm-3mm, the size of the welding edge 401 is 0.02mm-0.06mm smaller than the size of the welding edge 202 of the Dewar shell 2, has the two mounting screw holes 402 and the mounting surface 403.

[0011] The fixed pressing strip 5 is made of Kovar metal, has a long strip shape, and has a thickness of 1mm-2mm, and two installation through holes 501 are arranged at left and right ends.

[0012] The lead wire 6 is made of Au, and has a diameter of 38 microns.

[0013] The implementation process of the large-array infrared detector assembly Dewar electrical lead wire structure is as follows:

[0014] 1. The connector 1 is nested and installed inside the Dewar shell 2, and laser welding, argon arc welding and electron beam welding are used to perform airtight welding between the welding edge 102 of the connector 1 and the welding edge 201 of the Dewar shell 2.

[0015] 2. The welding hole 302 of the flexible ribbon wire 3 is nested with the pin 101 of the connector 1, and is welded by using a soldering iron.

[0016] 3. The welding edge 401 of the ribbon wire fixing frame 4 is nested with the welding edge 202 of the Dewar shell 2, and is welded by using laser welding, argon arc welding and electron beam welding.

[0017] 4. The installation hole 303 of the flexible ribbon wire 3 is aligned with the installation screw hole 402 of the ribbon wire fixing frame 4, is installed on the installation surface 403 of the ribbon wire fixing frame 4, the installation hole 501 of the fixed pressing strip 5 is aligned with the installation hole 303 of the flexible ribbon wire 3, and is fixed by using a screw.

[0018] 5. The bonding point 301 on the flexible ribbon wire 3 is connected with the large-array infrared detector through the lead wire 6.

[0019] The advantages of the present application are as follows:

[0020] 1. The structure is reliable and convenient to operate.

[0021] 2. The connector and the large-array infrared module of the infrared detector can be connected through the lead wire.

[0022] 3. The problem that the large-array infrared module of the infrared detector inside the Dewar cannot be directly bonded to the connector on the Dewar shell can be solved.

[0023] 4. The present application can ensure mechanical reliability and has less influence on heat leakage under the refrigeration working state of the Dewar. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic diagram of the large-array infrared detector assembly Dewar electrical lead wire structure.

[0025] In the drawing:

[0026] 1 - connector;

[0027] 2 - Dewar shell

[0028] 201 - Dewar shell welding edge

[0029] 3 - Flexible ribbon wire

[0030] 4 - Ribbon wire fixing frame

[0031] 5 - Fixing batten

[0032] 6 - Lead wire

[0033] Figure 2 Top view of Dewar electrical lead structure for large area infrared detector assembly

[0034] In the figure:

[0035] 202 - Dewar shell welding edge

[0036] 301 - Flexible ribbon wire bonding point

[0037] 501 - Fixing batten mounting hole

[0038] Figure 3 Connector schematic diagram

[0039] In the figure:

[0040] 101 - Connector pin

[0041] 102 - Connector welding edge

[0042] Figure 4 Flexible ribbon wire schematic diagram

[0043] In the figure:

[0044] 302 - Flexible ribbon wire welding hole

[0045] 303 - Flexible ribbon wire mounting hole

[0046] Figure 5 Ribbon wire fixing frame schematic diagram

[0047] In the figure:

[0048] 401 - Ribbon wire fixing frame welding edge

[0049] 402 - Ribbon wire fixing frame mounting screw hole

[0050] 403 - Ribbon wire fixing frame mounting surface

[0051] Figure 6 Fixing batten schematic diagram DETAILED DESCRIPTION

[0052] The specific embodiment of the present patent is further described in detail below with reference to the accompanying drawings. The schematic diagram of the electrical lead structure of the large-area infrared detector assembly in the present patent is shown in Figure 1 The large-area infrared detector assembly is encapsulated in the Dewar. The main implementation method of the present patent is as follows:

[0053] The connector 1 is made of Kovar metal, and the internal metal pin 101 is formed by glass bead airtight sintering. The connector has an outer dimension of 37.5 mm x 6.7 mm x 10.1 mm, and the four edges are chamfered with R=3 mm. The size of the welding edge 102 is 31.8 mm x 6.2 mm, and the four edges are chamfered with R=2 mm. The upper tolerance is -0.01 mm, and the lower tolerance is -0.03 mm.

[0054] The Dewar shell 2 is made of Kovar metal and is prepared by machining. The outer dimension is 81 mm x 81 mm x 64.2 mm. The bottom is a disc with a diameter of 63 mm and a thickness of 4 mm. The middle is a cylinder with a diameter of 35 mm and a thickness of 1.1 mm. The upper part is a square disc with a dimension of 81 mm x 81 mm and a thickness of 4 mm, and the middle is hollow. The size of the welding edge 201 of the Dewar shell 2 is 31.8 mm x 6.2 mm, and the four edges are chamfered with R=2 mm. The upper tolerance is +0.03 mm, and the lower tolerance is +0.01 mm. The size of the welding edge 202 of the Dewar shell 2 is 54 mm x 9 mm, and the four edges are chamfered with R=3 mm. The upper tolerance is +0.03 mm, and the lower tolerance is +0.01 mm.

[0055] The flexible ribbon wire 3 is made of constantan and is customized and processed. The size is 53 mm x 28 mm x 0.1 mm. The bonding points 301 on the flexible ribbon wire 3 are a total of 66, with a size of 0.5 mm x 0.8 mm and a mutual spacing of 0.2 mm. The welding holes 302 are a total of 66, with a diameter of 0.5 mm. The upper row has 23 welding holes, the lower row has 21 welding holes, the upper and lower spacing is 1.1 mm, and the left and right spacing is 1.27 mm. The two mounting holes 303 have a diameter of 1.8 mm, and the spacing between the two holes is 50 mm.

[0056] The ribbon wire fixing frame 4 is made of Kovar metal and has an arch bridge-like structure. The size is 54 mm x 9 mm x 6.7 mm. The welding edge 401 has a size of 54 mm x 9 mm, and the four edges are chamfered with R=3 mm. The upper tolerance is -0.01 mm, and the lower tolerance is -0.03 mm. The two mounting screw holes 402 have a diameter of 1.6 mm and a depth of 2.5 mm, and the spacing between the two holes is 50 mm. The mounting surface 403 has a size of 53 mm x 5 mm x 2.5 mm, and the four edges are chamfered with R=1 mm.

[0057] The fixed pressing strip 5 is made of Kovar, shaped as a long strip, with the size of 53mm*2.5mm, the thickness of 1.5mm, two mounting through holes 501 at the left and right ends, with the diameter of 1.8mm, and the distance between the two holes of 50mm.

[0058] The lead wire 6 is made of Au, with the diameter of 38 microns, and is interconnected by ultrasonic bonding equipment.

[0059] The implementation process of the large-array infrared detector assembly Dewar electrical lead wire structure is as follows:

[0060] 1. The connector 1 is nested and installed inside the Dewar shell 2, and the welding edge 102 of the connector 1 and the welding edge 201 of the Dewar shell 2 are hermetically welded by using welding methods such as laser welding, argon arc welding and electron beam welding.

[0061] 2. The welding hole 302 of the flexible ribbon wire 3 and the pin 101 of the connector 1 are nested with each other, and are welded by using electric soldering iron tin soldering.

[0062] 3. The welding edge 401 of the ribbon wire fixing frame 4 and the welding edge 202 of the Dewar shell 2 are nested with each other, and are welded and fixed by using welding methods such as laser welding, argon arc welding and electron beam welding.

[0063] 4. The mounting hole 303 of the flexible ribbon wire 3 is aligned with the mounting screw hole 402 of the ribbon wire fixing frame 4, and is mounted on the mounting surface 403 of the ribbon wire fixing frame 4, the mounting hole 501 of the fixed pressing strip 5 is aligned with the mounting hole 303 of the flexible ribbon wire 3, and is fixed by two M1.6 screws.

[0064] 5. The bonding point 301 on the flexible ribbon wire 3 and the large-array infrared detector are interconnected by the lead wire 6.

Claims

1. A kind of for large array infrared detector assembly dewar electrical lead structure, including connector (1), dewar shell (2), flexible ribbon (3), ribbon fixed frame (4), fixed compression strip (5), lead (6), it is characterized in following: The welding edge (102) of the connector (1) is connected with the welding edge (201) of the dewar shell (2), the welding hole (302) of the flexible ribbon (3) is nested with the pin (101) of the connector (1), the welding edge (401) of the ribbon fixed frame (4) is connected with the welding edge (202) of the dewar shell (2), the mounting hole (303) of the flexible ribbon (3) is aligned with the mounting screw hole (402) of the ribbon fixed frame (4), is mounted on the mounting surface (403) of the ribbon fixed frame (4), the mounting hole (501) of the fixed compression strip (5) is aligned with the mounting hole (303) of the flexible ribbon (3), the bonding point (301) on the flexible ribbon (3) is interconnected with large array infrared detector through lead (6); The connecting process of the lead structure is: a, the connector (1) is nested and installed in the dewar shell (2) inside, using welding method makes the welding edge (102) of the connector (1) and the welding edge (201) of the dewar shell (2) carry out gas tight welding; b, the welding hole (302) of the flexible ribbon (3) is nested with the pin (101) of the connector (1), is welded by electric soldering iron soldering; c, the welding edge (401) of the ribbon fixed frame (4) is nested with the welding edge (202) of the dewar shell (2), is welded and fixed using welding method; d, the mounting hole (303) of the flexible ribbon (3) is aligned with the mounting screw hole (402) of the ribbon fixed frame (4), is mounted on the mounting surface (403) of the ribbon fixed frame (4), the mounting hole (501) of the fixed compression strip (5) is aligned with the mounting hole (303) of the flexible ribbon (3), is fixed by screw; e, the bonding point (301) on the flexible ribbon (3) is interconnected with large array infrared detector through lead (6).

2. A Dewar electrical feedthrough structure for a large area array infrared detector assembly according to claim 1, wherein: The material of the connector (1) is Kovar metal, the internal metal pin (101) is formed by glass bead airtight sintering, the size of the side welding edge (102) is adapted to the welding edge (201) of the dewar shell (2).

3. A Dewar electrical feedthrough structure for a large area array infrared detector assembly according to claim 1, wherein: The material of the dewar shell (2) is Kovar metal, the welding edge (201) of the dewar shell (2) size is 0.02mm-0.06mm larger than the welding edge (102) size of the connector (1), the welding edge (202) of the dewar shell (2) size is 0.02mm-0.06mm larger than the welding edge (401) of the ribbon fixed frame (4).

4. The electrical feedthrough structure for a large format infrared detector assembly dewar according to claim 1, wherein: The material of the flexible ribbon (3) is constantan, the thickness is about 0.1mm-0.2mm, there are bonding point (301), welding hole (302) and two mounting holes (303) on the flexible ribbon (3).

5. A Dewar electrical feedthrough structure for a large area array infrared detector assembly according to claim 1, wherein: The material of the wire fixing frame (4) is Kovar metal, the structure is like an arch bridge, the thickness is 2mm-3mm, the size of the welding edge (401) is 0.02mm-0.06mm smaller than that of the welding edge (202) of the Dewar shell (2), and the wire fixing frame (4) has two mounting screw holes (402) and a mounting surface (403).

6. A Dewar electrical feedthrough structure for a large area array infrared detector assembly according to claim 1, wherein: The material of the fixing strip (5) is Kovar metal, the shape is long strip, the thickness is 1mm-2mm, and the left and right ends have two mounting through holes (501).

7. A Dewar electrical feedthrough structure for a large array infrared detector assembly according to claim 1, wherein: The material of the lead wire (6) is Au, and the diameter is 38 microns.

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