A two-color infrared detector and its lead assembly

Abstract

The present invention relates to the field of infrared detection technology, and specifically to a two-color infrared detector and its lead assembly. The lead assembly includes a metal part, a plurality of rectangular ceramics and an adjustment ring; the metal part includes an upper metal ring, a flange and a lower metal ring connected to each other, a plurality of rectangular ceramics are evenly distributed along the circumference of the metal part and can be inserted into the flange so as to slide up and down, the outer surface of the rectangular ceramic is provided with an external thread, the adjustment ring is arranged inside the upper metal ring and can rotate around its own axis, there is a preset rotation resistance between the adjustment ring and the upper metal ring, the inner circumferential wall of the adjustment ring is provided with an internal thread, and the internal thread can cooperate with the external thread on the rectangular ceramic. The present invention can realize the synchronous adjustment of all rectangular ceramics by rotating the adjustment ring, and the adjustment ring acts as a positioning and locking element for the rectangular ceramic, which has a fixing effect on the rectangular ceramic when it is subjected to external force, thereby ensuring that the stress at the weld is small and cracks are not easy to appear.

Description

Technical Field

[0001] The invention relates to the technical field of infrared detection, and in particular to a two-color infrared detector and a lead assembly thereof. Background Art

[0002] Infrared detection technology is a technology that uses infrared radiation emitted by objects to achieve target detection, identification and ranging. Infrared radiation is an electromagnetic wave with a wavelength longer than visible light but shorter than microwaves, and its frequency range is generally 0.75μm~1000μm. Infrared detection technology has the advantages of being unaffected by light, strong adaptability, and good concealment. It is widely used in military, security, industrial control and other fields.

[0003] Refrigerated infrared detectors often use Dewar packaging to detect chips, filters and other components. Dewar is the packaging carrier of the refrigerated infrared detection chip, which is used to provide optical, electrical and mechanical interfaces for the infrared detector assembly. The lead ring is the electrical interface of the Dewar, which is internally bonded to the readout circuit chip through leads, and externally connected to the system processing circuit. The article "Miniaturization Design Method of Infrared Detector Dewar" published in the journal "Infrared" Volume 41, Issue 9, 2020, introduces the structure of the infrared Dewar, which mentions the use of connectors as the external interface of the lead ring. The Chinese patent document with authorization announcement number CN109449215B discloses an infrared detector electrical lead-out device, which also uses a standard connector to solve the problem of large space occupied by the traditional lead structure. The connector technology is mature, occupies little space, and has standardized interfaces, which is convenient for the application of the whole system and is conducive to the miniaturization of the Dewar.

[0004] The article "Design of High-precision Low-temperature Brazing Lead Ring for Infrared Detectors" published in the journal "Laser & Infrared" Vol. 53, Issue 9, 2023, publicly pointed out that the traditional lead ring has a circular ring structure and the positions of the pins and pads are fixed, making it difficult to adjust the position of the detector in the axial direction. Figure 3 As shown, the lead ring is composed of a metal ring and two rectangular ceramics. The rectangular ceramics are inserted into the square hole of the metal ring to form a cross-shaped welding joint. The cross-shaped welding joint can change the position of the pin and the pad by adjusting the upper and lower positions of the rectangular ceramics to adapt to electrical interfaces in different positions. The above scheme has the following problems: first, it is impossible to adjust the position of the two rectangular ceramics synchronously, which is inefficient; second, the fixation of the rectangular ceramics depends only on the solder at the welding point, and the connection strength is poor; third, the rectangular ceramics still need to be positioned using a fixture during the welding process, otherwise displacement may occur during the welding operation.

[0005] The information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0006] According to the deficiencies of the prior art, the present invention proposes a dual-color infrared detector and a lead assembly thereof to solve the problems of inconvenient ceramic adjustment and unreliable fixation of the prior infrared detector lead assembly.

[0007] The lead wire assembly of a dual-color infrared detector of the present invention adopts the following technical scheme: comprising a metal part, an adjustment ring and a plurality of rectangular ceramics; the metal part comprises an upper metal ring, a flange plate and a lower metal ring connected to each other;

[0008] A plurality of rectangular ceramics are evenly distributed along the circumference of the metal piece and can be inserted into the flange plate in a manner of sliding up and down. In the radial direction, the upper part of the rectangular ceramics is located inside the upper metal ring, and the lower part is located outside the lower metal ring. The outer surface of the rectangular ceramics is provided with external threads.

[0009] The adjusting ring is arranged inside the upper metal ring and can rotate around its own axis. There is a preset rotation resistance between the adjusting ring and the upper metal ring. The adjusting ring is located outside the rectangular ceramic. The inner wall of the adjusting ring is provided with an internal thread. The internal thread can cooperate with the external thread on the rectangular ceramic. The internal thread and the external thread are self-locking threads.

[0010] Optionally, a positioning groove is provided on the inner circumferential wall of the upper metal ring, and the positioning groove is annular. One end of the adjustment ring is provided with a plurality of stop feet, the stop feet are elastic, and the stop feet are arranged in the positioning groove and have a preset friction force with the positioning groove.

[0011] Optionally, the lead assembly of the dual-color infrared detector also includes an adjustment tube, one end of which is provided with a plurality of limit grooves, the limit grooves are adapted to the stop feet, the adjustment tube can be inserted into or withdrawn from the upper metal ring, and the stop feet are located in the limit grooves when the adjustment tube is inserted into the upper metal ring.

[0012] Optionally, a guide groove is provided at the external thread of the rectangular ceramic, and the guide groove penetrates the external thread along the axial direction.

[0013] Optionally, a sliding block is provided on the lower metal ring, and a sliding rail cooperating with the sliding block is provided on the rectangular ceramic.

[0014] Optionally, the slider and the slide rail are dovetail structures.

[0015] Optionally, a bonding finger is provided at the upper end of the rectangular ceramic and a connector is provided at the side.

[0016] Optionally, threaded holes are provided on the rectangular ceramic, and the threaded holes are located on both sides of the connector.

[0017] Optionally, the lead assembly of the above two-color infrared detector is assembled according to the following steps:

[0018] Step 1, turn the metal part upside down and fix it;

[0019] Step 2, install the adjustment ring into the upper metal ring so that the stop foot and the positioning groove fit together;

[0020] Step 3, insert the rectangular ceramic into the metal part and move it to the position where the external thread and the internal thread contact;

[0021] Step 4, insert the adjustment tube into the upper metal ring from bottom to top and place it on the lower side of the adjustment ring, with the stop foot located in the limit groove. Rotate the adjustment tube to drive the adjustment ring to rotate, and the adjustment ring drives the rectangular ceramic to move down to the specified position;

[0022] Step 5, when the metal piece is inverted, filler brazing is performed on the gaps between the rectangular ceramic and the metal piece.

[0023] A two-color infrared detector comprises the lead assembly of the two-color infrared detector mentioned above.

[0024] The beneficial effects of the present invention are as follows: a lead assembly of a two-color infrared detector of the present invention is provided with an adjustment ring, which can rotate and cooperate with the rectangular ceramic thread. When installing, the adjustment ring can be rotated to achieve synchronous adjustment of all rectangular ceramics. Moreover, the adjustment ring acts as a positioning and locking element for the rectangular ceramics, which has a fixing effect on the rectangular ceramics when the rectangular ceramics are subjected to external force. In particular, when the connector on the rectangular ceramics is pulled by external wires, the thread cooperation between the internal thread and the external thread can limit the outward movement of the rectangular ceramics, thereby ensuring that the stress at the weld is small and cracks are not prone to occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a schematic diagram of the overall structure of a lead assembly of a dual-color infrared detector of the present invention;

[0027] Figure 2 for Figure 1 A top view of

[0028] Figure 3 for Figure 2 Middle AA section view;

[0029] Figure 4 for Figure 3 Schematic diagram of the upside-down structure (with adjustment cylinder);

[0030] Figure 5 for Figure 1 Decomposition Figure 1 ;

[0031] Figure 6 for Figure 1 Decomposition Figure 2 .

[0032] In the figure:

[0033] 110, lower metal ring; 120, flange; 130, upper metal ring; 140, positioning groove; 150, slider; 160, mounting groove;

[0034] 210, adjusting ring; 220, stop foot; 230, internal thread;

[0035] 310, rectangular ceramic; 320, slide rail; 330, bonding finger; 340, connector; 350, external thread; 360, guide groove; 370, threaded hole;

[0036] 410. Adjusting cylinder; 420. Limiting groove. DETAILED DESCRIPTION

[0037] 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 making creative work are within the scope of protection of the present invention.

[0038] like Figures 1 to 6 As shown, a lead assembly of a two-color infrared detector provided by an embodiment of the present invention includes a metal part, an adjustment ring 210 and a plurality of rectangular ceramics 310; the metal part includes an upper metal ring 130, a flange 120 and a lower metal ring 110 connected to each other, the upper metal ring 130 and the lower metal ring 110 are connected, and the metal ring is designed as a flange structure to facilitate the installation and positioning of the detector.

[0039] A number of rectangular ceramics 310 are evenly distributed along the circumference of the metal part and can be slidably inserted into the flange 120 up and down. In the radial direction, the upper part of the rectangular ceramic 310 is located on the inner side of the upper metal ring 130, and the lower part is located on the outer side of the lower metal ring 110. The outer surface of the rectangular ceramic 310 is provided with an external thread 350; specifically, the portion of the flange 120 located between the upper metal ring 130 and the lower metal ring 110 is provided with an installation groove 160, and the rectangular ceramic 310 is slidably inserted into the installation groove 160, thereby realizing the assembly of the rectangular ceramic 310, which is convenient for subsequent position adjustment and welding. Referring to the diagram, the preferred rectangular ceramics 310 of the present invention are provided with two. Naturally, the rectangular ceramics 310 can also be set to three or more according to the needs of data transmission.

[0040] A soldering pad is arranged inside the upper metal ring 130 above the rectangular ceramic 310, and the soldering pad is electrically connected to the detection chip through a lead. A bonding finger 330 is arranged at the upper end of the rectangular ceramic 310, and a connector 340 is arranged on the side, with an angle of 90° between the two. The rectangular ceramic 310 is electrically connected to the soldering pad and the connector 340 through the bonding finger 330, and the connector 340 is connected to an external processing circuit, thereby realizing the electrical input and output of the detector and the system.

[0041] The adjustment ring 210 is arranged inside the upper metal ring 130 and can rotate around its own axis. There is a preset rotation resistance between the adjustment ring 210 and the upper metal ring 130. The adjustment ring 210 is located on the periphery of the rectangular ceramic 310. The inner wall of the adjustment ring 210 is provided with an internal thread 230. The internal thread 230 can cooperate with the external thread 350 on the rectangular ceramic 310. The internal thread 230 and the external thread 350 are self-locking threads. When in use, the adjusting ring 210 is rotated to drive several rectangular ceramics 310 to move synchronously, so as to realize synchronous and rapid adjustment of the rectangular ceramics 310. After adjusting the position of the rectangular ceramics 310, the adjusting ring 210 locks the position of the rectangular ceramics 310 through the cooperation of the internal thread 230 and the external thread 350 to ensure the positioning accuracy. That is, the adjusting ring 210 acts as a positioning locking element for the rectangular ceramics 310, and has a fixing effect on the rectangular ceramics 310 when the external force is applied to the rectangular ceramics 310. In particular, when the connector 340 on the rectangular ceramics 310 is pulled by external wires, the thread cooperation between the internal thread 230 and the external thread 350 can limit the outward movement of the rectangular ceramics 310, thereby ensuring that the stress at the weld is small and cracks are not prone to occur.

[0042] In a further embodiment, a positioning groove 140 is provided on the inner wall of the upper metal ring 130, and the positioning groove 140 is annular. A plurality of stop feet 220 are provided at one end of the adjusting ring 210. The stop feet 220 are elastic, and for example, can be made of metal spring sheets. The stop feet 220 are arranged in the positioning groove 140 and have a preset friction force with the positioning groove 140. The setting of the stop feet 220 can limit the axial position of the adjusting ring 210 in the metal part, and at the same time can limit the rotation of the adjusting ring 210 without being subjected to a large external force.

[0043] In a further embodiment, the lead assembly of a two-color infrared detector of the present invention further includes an adjustment cylinder 410, one end of which is provided with a plurality of limit grooves 420, which are adapted to the stop foot 220, and the adjustment cylinder 410 can be inserted into or withdrawn from the upper metal ring 130, and the stop foot 220 is located in the limit groove 420 when the adjustment cylinder 410 is inserted into the upper metal ring 130. By matching the adjustment cylinder 410, when in use, it is only necessary to insert the adjustment cylinder 410 into the metal part to clamp the stop foot 220, and then rotate the adjustment cylinder 410, the adjustment cylinder 410 pushes the stop foot 220 and drives the adjustment ring 210 to rotate, and the rotation of the adjustment ring 210 drives the rectangular ceramic 310 to move synchronously to the specified position, and the adjustment cylinder 410 can be pulled out after the position is adjusted.

[0044] In a further embodiment, a guide groove 360 ​​is provided at the external thread 350 of the rectangular ceramic 310, and the guide groove 360 ​​axially penetrates the external thread 350. After the rectangular ceramic 310 is adjusted in position, it needs to be welded with a metal part to achieve fixation and sealing. During welding, the metal part is turned upside down to facilitate the brazing material to be filled between the mounting groove 160 and the external thread 350 through the guide groove 360 ​​under the action of gravity.

[0045] Furthermore, a plurality of guide grooves 360 are provided to further improve the reliability and efficiency of filling.

[0046] In a further embodiment, a slider 150 is provided on the side wall of the lower metal ring 110, and a slide rail 320 cooperating with the slider 150 is provided on the rectangular ceramic 310. The slider 150 and the slide rail 320 are provided to facilitate positioning of the rectangular ceramic 310. Furthermore, the slider 150 and the slide rail 320 are dovetail structures, which further improves the connection strength and connection reliability.

[0047] In a further embodiment, the rectangular ceramic 310 is provided with threaded holes 370 , which are located on both sides of the connector 340 for installation and fixation of an external electrical adapter.

[0048] Referring to the above embodiment, the lead assembly of a dual-color infrared detector of the present invention is assembled according to the following steps:

[0049] Step 1, turn the metal parts upside down (upper metal ring 130 is at the bottom, lower metal ring 110 is at the top), and fix them; the fixation can be assisted by a clamp or manually fixed, and the fixing method is not limited, and its purpose is to facilitate the subsequent rotation of the adjustment ring 210;

[0050] Step 2, install the adjustment ring 210 into the upper metal ring 130 so that the stop foot 220 and the positioning groove 140 are matched;

[0051] Step 3, insert the rectangular ceramic 310 into the metal part, and move it to the position where the external thread 350 and the internal thread 230 are in contact; it should be explained here that when installing the rectangular ceramic 310, the metal part is inverted to facilitate the threading of the internal thread 230 and the external thread 350 (the combination of the first thread), and after inversion, the rectangular ceramic 310 will not fall off the metal part, and there is no need to additionally fix the rectangular ceramic 310;

[0052] Step 4, insert the adjustment cylinder 410 from bottom to top into the upper metal ring 130, and place it on the lower side of the adjustment ring 210, the stop foot 220 is located in the limit groove 420, and the adjustment cylinder 410 is rotated to drive the adjustment ring 210 to rotate, and the adjustment ring 210 drives the rectangular ceramic 310 to move down to the specified position synchronously and quickly through the cooperation of the internal thread 230 and the external thread 350; after being assembled in place, the rotation and movement of the adjustment ring 210 are limited by the cooperation of the stop foot 220 and the positioning groove 140, thereby locking the position of the rectangular ceramic 310;

[0053] Step 5: When the metal piece is inverted, filler is brazed at each gap between the rectangular ceramic 310 and the metal piece.

[0054] The present invention also provides a two-color infrared detector, including the above-mentioned lead assembly, and also includes a detection chip and a filter. The detection chip can obtain target information in two bands. The lead assembly, the detection chip and the filter are packaged in a Dewar structure. The Dewar structure includes main components such as a cold finger, a housing, and a cold screen. The specific structural form is the existing technology, and can refer to the "Miniaturization Design Method of Infrared Detector Dewar", which will not be repeated here.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lead assembly for a dual-color infrared detector, characterized in that: It includes a metal part, an adjustment ring and a plurality of rectangular ceramics; the metal part includes an upper metal ring, a flange plate and a lower metal ring connected to each other; A plurality of rectangular ceramics are evenly distributed along the circumference of the metal piece and can be inserted into the flange plate in a manner of sliding up and down. In the radial direction, the upper part of the rectangular ceramics is located inside the upper metal ring, and the lower part is located outside the lower metal ring. The outer surface of the rectangular ceramics is provided with external threads. The adjusting ring is arranged inside the upper metal ring and can rotate around its own axis. There is a preset rotation resistance between the adjusting ring and the upper metal ring. The adjusting ring is located outside the rectangular ceramic. The inner wall of the adjusting ring is provided with an internal thread. The internal thread can cooperate with the external thread on the rectangular ceramic. The internal thread and the external thread are self-locking threads.

2. The lead assembly of a dual-color infrared detector according to claim 1, characterized in that: The inner wall of the upper metal ring is provided with a positioning groove, which is annular. One end of the adjusting ring is provided with a plurality of stop feet, which are elastic, are arranged in the positioning groove and have a preset friction force with the positioning groove.

3. The lead assembly of a dual-color infrared detector according to claim 2, characterized in that: The lead assembly of the dual-color infrared detector also includes an adjustment tube, one end of which is provided with a plurality of limit grooves, which are adapted to the stop feet. The adjustment tube can be inserted into or withdrawn from the upper metal ring, and the stop feet are located in the limit grooves when the adjustment tube is inserted into the upper metal ring.

4. The lead assembly of a dual-color infrared detector according to claim 1, characterized in that: A guide groove is provided at the external thread of the rectangular ceramic, and the guide groove penetrates the external thread along the axial direction.

5. The lead assembly of a dual-color infrared detector according to claim 1, characterized in that: A sliding block is arranged on the lower metal ring, and a sliding rail matched with the sliding block is arranged on the rectangular ceramic.

6. The lead wire assembly of a dual-color infrared detector according to claim 5, characterized in that: The slider and the slide rail are dovetail structures.

7. The lead assembly of a dual-color infrared detector according to claim 1, characterized in that: The upper end of the rectangular ceramic is provided with bonding fingers, and the side is provided with connectors.

8. The lead assembly of a dual-color infrared detector according to claim 7, characterized in that: The rectangular ceramic is provided with threaded holes, and the threaded holes are located on both sides of the connector.

9. The lead wire assembly of a dual-color infrared detector according to claim 3, characterized in that: The lead assembly of the dual-color infrared detector is assembled according to the following steps: Step 1, turn the metal part upside down and fix it; Step 2, install the adjustment ring into the upper metal ring so that the stop foot and the positioning groove fit together; Step 3, insert the rectangular ceramic into the metal part and move it to the position where the external thread and the internal thread contact; Step 4, insert the adjustment tube into the upper metal ring from bottom to top and place it on the lower side of the adjustment ring, with the stop foot located in the limit groove. Rotate the adjustment tube to drive the adjustment ring to rotate, and the adjustment ring drives the rectangular ceramic to move down to the specified position; Step 5, when the metal piece is inverted, filler brazing is performed on the gaps between the rectangular ceramic and the metal piece.

10. A two-color infrared detector, characterized in that: A lead assembly comprising a dual-color infrared detector as described in any one of claims 1-8.

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