Total reflection optical splicing focal plane structure

Abstract

The invention relates to a total reflection optical splicing focal plane structure, belongs to the technical field of space optical remote sensing, and solves the problem that the utilization rate of pixels of a detector is reduced due to the large range of a pixel overlapping area. The device comprises a focal plane substrate, a reflector assembly and at least two detector module assemblies, each detector module assembly comprises a detector, a supporting structure assembly, an installation and adjustment gasket set, a circuit board, a module assembly cover plate and a stray light eliminating blocking piece, and the stray light eliminating blocking piece is fixed to an installation face where a photosensitive pixel area of the detector is located. The detector, the circuit board and the module assembly cover plate are all fixed on the supporting structure assembly, the focal plane substrate is provided with substrate light through holes, and one detector module assembly is fixed on each substrate light through hole. According to the invention, the distance between the light-sensitive surface of the sensor and the mirror surface of the reflector can be reduced, thereby reducing the number of pixels in a pixel overlapping area, improving the pixel utilization rate of the detector, reducing the number of the detectors and the number of structural components and electronic components matched with the detectors, and reducing the production cost.

Description

Technical Field

[0001] The invention relates to the technical field of space optical remote sensing, and in particular to a total reflection optical splicing focal plane structure. Background Art

[0002] Space cameras widely use the method of splicing multiple detectors to expand the width to meet the needs of long-line arrays and large-area arrays on the focal plane. Currently, the common focal plane splicing methods include mechanical splicing and optical splicing. Among them, optical splicing is mainly divided into semi-reflective and semi-transparent optical splicing and fully reflective and fully transparent optical splicing.

[0003] Mechanical focal plane stitching is to arrange the detectors into two staggered parallel arrays. Two adjacent detectors are staggered in the direction of image movement. The space gap in the first row is supplemented by the detectors in the second row. The pixel areas between adjacent detectors are overlapped end to end. The advantages are compact structure and simple operation. The disadvantages are that the focal plane of this stitching method is difficult to process in the later stage and requires a large storage capacity.

[0004] Semi-reflective and semi-transparent optical splicing. The advantage of this splicing method is that it avoids a lot of image processing work in mechanical splicing. The disadvantage is that the beam splitter is large in size and weight, and the light energy utilization rate is low, which affects the camera imaging effect.

[0005] At present, full reflection and full transmission optical splicing is usually used. The reflector used in this splicing method is small in size and weight and has high light energy utilization rate. The disadvantage is that the edge of the mirror surface of the full reflector will cause vignetting when dividing the light beam. It is necessary to set up a detector pixel overlap area to compensate for the influence of vignetting. The overlap area range is designed according to the vignetting spot size, and the overlap area range must be able to cover the vignetting spot size. Usually, the number of pixels in the pixel overlap area accounts for 10%-30% of the total number of detector pixels. The existence of the pixel overlap area reduces the utilization rate of the detector pixels. Summary of the invention

[0006] In order to solve the problem in the prior art that the utilization rate of detector pixels is reduced due to the large pixel overlap area, the present invention proposes a total reflection optical splicing focal plane structure that can improve the utilization rate of detector pixels. The total reflection optical splicing focal plane structure improves the vignetting phenomenon introduced by the reflector, reduces the number of pixels in the overlap area, and improves the utilization rate of detector pixels.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0008] A total reflection optical splicing focal plane structure, comprising a focal plane substrate, a reflector assembly and at least two detector module assemblies;

[0009] Each detector module assembly includes a detector, a support structure assembly, an adjustment gasket group, a circuit board, a module assembly cover plate and a stray light shielding sheet. A first cover plate mounting surface and a first circuit board mounting surface located inside the first cover plate mounting surface are provided on one side surface of the support structure assembly, and a detector seat support structure is provided on the other opposite side surface. A detector mounting surface and a detector pin through hole are provided inside the detector seat support structure. The pin pins of the detector pass through the pin through hole of the detector and are welded and fixed to the circuit board through hole on the circuit board. The support structure mounting surface where the pin pins are located is fixedly connected to the detector mounting surface. The first baffle mounting surface where the photosensitive pixel area of ​​the detector is located is flush with the top surface of the detector seat support structure, the second circuit board mounting surface of the circuit board is fixedly connected to the first circuit board mounting surface, the module component cover is fixedly connected to the first cover mounting surface, the stray light eliminating baffle is provided with a baffle light through hole matching the size of the photosensitive pixel area, after the baffle light through hole is aligned with the photosensitive pixel area, the stray light eliminating baffle is fixedly connected to the first baffle mounting surface, the two opposite side edges of the support structure component are provided with a support structure external mounting surface, and the support structure external mounting surface is provided with a support structure external mounting interface for fixing to the focal plane substrate;

[0010] The focal plane substrate includes a direct surface detector mounting plate, a reflective surface detector mounting plate and a reflector mounting surface located therebetween. The direct surface detector mounting plate and the reflective surface detector mounting plate are respectively provided with at least one substrate light through hole. A reflector assembly is mounted on the reflector mounting surface. On the sides of the direct surface detector mounting plate and the reflective surface detector mounting plate facing away from the reflector assembly, a pair of mounting bosses with mounting threaded holes are respectively provided on both sides of each substrate light through hole. The size of each substrate light through hole is larger than the outer contour size of the characteristic supporting structure of the detector seat. A detector module assembly is fixedly mounted on each substrate light through hole through the mounting threaded hole, an adjusting gasket group and an external mounting interface of the supporting structure. The adjusting gasket group includes two gaskets, which are both assembled between the external mounting surface of the supporting structure and the mounting boss of the focal plane substrate, and the detector seat supporting structure in the installed detector module assembly passes through the corresponding substrate light through hole from the side where the mounting boss is located.

[0011] The beneficial effects of the present invention are:

[0012] The present invention adjusts the focal plane substrate structure and enlarges the size of the light-through hole of the substrate so that the detector and the detector seat support structure can pass through the substrate wall, thereby allowing the detector photosensitive surface to move forward in the opposite direction along the incident direction of light, reducing the distance between the photosensitive pixel surface of the detector and the mirror surface of the reflector. At the same time, the detector support structure is rearwardly placed on the back of the detector tube shell, eliminating the thickness of the detector support seat and the adjustment gasket, further shortening the distance from the photosensitive pixel surface to the mirror surface of the reflector, improving the vignetting phenomenon caused by the reflector in optical splicing, thereby reducing the range of the detector overlapping pixel area, and ultimately improving the detector pixel utilization rate in optical splicing. At the same time, it helps to reduce the number of detectors used in the optical splicing focal plane of wide-width cameras, reduce the production cost of wide-width cameras, and improve the economic benefits of camera mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of one structure of a total reflection optical splicing focal plane structure described in the present invention;

[0014] Figure 2 for Figure 1 Schematic diagram of the back structure of the total reflection optical splicing focal plane structure shown

[0015] Figure 3 is a schematic diagram of one structure of a focal plane substrate;

[0016] Figure 4 is a schematic diagram of the structure of a reflector assembly;

[0017] Figure 5 is a schematic diagram of the structure of the detector;

[0018] Figure 6 is a schematic diagram of the structure of the supporting structure assembly;

[0019] Figure 7 It is a structural schematic diagram of the gasket assembly;

[0020] Figure 8 It is a schematic diagram of the structure of the circuit board;

[0021] Fig. 9 It is a structural schematic diagram of the module component cover;

[0022] Fig.10 It is a schematic diagram of the structure of the stray light blocking piece;

[0023] Fig.11 It is a schematic diagram of the assembly relationship of the detector module components;

[0024] Fig.12 is a comparison diagram between a conventional focal plane structure and the focal plane structure of the present invention;

[0025] Fig.13This is the light trace diagram of the reflector when L1 = 31.7 mm and the field of view is 0°;

[0026] Fig.14 This is the light trace diagram of the reflector when L2=21.7mm and the field of view is 0°.

[0027] Description of reference numerals: 1, focal plane substrate; 2, detector; 3, reflector assembly; 4, support structure assembly; 5, adjustment gasket set; 6, circuit board; 7, module assembly cover; 8, stray light shield; 9, substrate light hole; 10, reflector mounting surface; 11, direct surface mounting boss; 12, reflective surface mounting boss; 13, mounting threaded hole; 14, reflector surface; 15, reflector external mounting surface; 16, photosensitive pixel area; 17, pin pin; 18, first shield mounting surface; 1 9. Support structure mounting surface; 20. Detector mounting surface; 21. Detector pin through hole; 22. Detector seat support structure; 23. Support structure external mounting surface; 24. First circuit board mounting surface; 25. First cover plate mounting surface; 26. Support structure external mounting interface; 27. Circuit board through hole; 28. Second circuit board mounting surface; 29. ​​Second cover plate mounting surface; 30. Limiting boss structure; 31. Second baffle mounting surface; 32. Baffle light hole; 33. Detector module assembly. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0029] See also Figures 1 to 11 This embodiment provides a total reflection optical splicing focal plane structure that can improve the utilization rate of detector pixels, which includes a focal plane substrate 1, a reflector assembly 3 and at least two detector module assemblies 33 with the same structure. The reflector assembly 3 and each detector module assembly 33 are installed on the focal plane substrate 1, wherein each detector module assembly 33 includes a detector 2, a support structure assembly 4, a circuit board 6, a module assembly cover 7 and a stray light shielding sheet 8. It should be noted that Figure 1-Figure 3 The structure of the present invention is merely illustrated by taking the total reflection optical splicing focal plane structure of the present invention including three detector module assemblies 33 as an example, which should not be regarded as limiting the protection scope of the present invention.

[0030] Specifically, the focal plane substrate 1 includes a direct surface detector mounting plate and a reflective surface detector mounting plate. The direct surface detector mounting plate and the reflective surface detector mounting plate are connected to each other on their sides and are perpendicular to each other. Alternatively, the direct surface detector mounting plate and the reflective surface detector mounting plate may also adopt an integrated structure or other common focal plane structures, which is not limited here.

[0031] At least one substrate light through hole 9 is provided on the direct surface detector mounting plate, and at least one substrate light through hole 9 is also provided on the reflective surface detector mounting plate. The size of each substrate light through hole 9 is larger than the outer contour size of the detector seat support structure 22 in the support structure assembly 4, that is, Figure 6 The outline dimensions of the middle dotted line envelope.

[0032] The focal plane substrate 1 also includes a reflector mounting surface 10 assembled with the reflector assembly 3, and the reflector mounting surface 10 is located between the direct surface detector mounting plate and the reflective surface detector mounting plate. The function of the reflector assembly 3 is to fold the light path and overlap the pixel areas of the detector on the direct surface detector mounting plate and the detector on the reflective surface detector mounting plate to achieve detector pixel overlap.

[0033] like Figure 3 As shown, taking the focal plane substrate 1 including three substrate light through holes 9 as an example, two substrate light through holes 9 are provided on the direct surface detector mounting plate, one substrate light through hole 9 is provided on the reflective surface detector mounting plate, and the reflector mounting surface 10 is located between the two substrate light through holes 9 on the direct surface detector mounting plate. The substrate light through holes 9 on the reflective surface detector mounting plate are arranged opposite to the reflector assembly 3 mounted on the reflector mounting surface 10, so as to receive the light reflected by the reflector assembly 3.

[0034] On the side of the direct surface detector mounting plate and the reflective surface detector mounting plate facing away from the reflector assembly 3, a pair of mounting bosses are respectively provided on both sides of each substrate light through hole 9. The mounting bosses provided on the direct surface detector mounting plate and the reflective surface detector mounting plate are respectively the direct surface mounting boss 11 and the reflective surface mounting boss 12, and both the direct surface mounting boss 11 and the reflective surface mounting boss 12 are provided with mounting threaded holes 13 for assembly with the corresponding support structure assembly 4.

[0035] The direct surface mounting boss 11 is used for assembly with the supporting structure assembly 4 located on the direct surface detector mounting plate. It should be noted that each supporting structure assembly 4 located on the direct surface detector mounting plate has two coplanar mounting surfaces with the focal plane substrate 1, and the mounting surfaces increase in pairs as the number of direct surface detectors increases.

[0036] The reflective surface mounting boss 12 is used for assembly with the support structure assembly 4 located on the reflective surface detector mounting plate. It should be noted that the support structure assembly 4 located on the reflective surface detector mounting plate has two coplanar mounting surfaces with the focal plane substrate 1 .

[0037] The reflector assembly 3 comprises a reflector surface 14 and a reflector external mounting surface 15 . The reflector external mounting surface 15 is fixedly connected to the reflector mounting surface 10 .

[0038] The detector 2 includes a photosensitive pixel area 16, a pin pin 17, a first baffle mounting surface 18 and a support structure mounting surface 19. The photosensitive pixel area 16 and the pin pin 17 are located on both sides. The first baffle mounting surface 18 is located on the side where the photosensitive pixel area 16 is located, and the support structure mounting surface 19 is away from the photosensitive surface side and is located on the side where the pin pin 17 is located. The first baffle mounting surface 18 is used to install the stray light blocking sheet 8, and the support structure mounting surface 19 is used to be fixed to the support structure assembly 4.

[0039] The support structure assembly 4 includes a detector mounting surface 20, a detector pin through hole 21, a detector seat support structure 22, a support structure external mounting surface 23, a first circuit board mounting surface 24, a first cover plate mounting surface 25 and a support structure external mounting interface 26. One side surface of the support structure assembly 4 is provided with a first cover plate mounting surface 25 and a first circuit board mounting surface 24 located inside and recessed in the first cover plate mounting surface 25, and the other opposite side surface is provided with a detector seat support structure 22, and the inside of the detector seat support structure 22 is provided with a recessed detector mounting surface 20 and a through detector pin through hole 21. The support structure assembly 4 is an integrated assembly, which provides support for the detector 2 and the circuit board 6 at the same time. It should be noted that as long as the stable connection between the detector 2, the circuit board 6 and the focal plane substrate 1 can be achieved, the support structure assembly 4 is not limited to the integrated structure form in the present application, and a split design or other structural forms can also be used.

[0040] The circuit board 6 is provided with a circuit board through hole 27 that matches with the pin pin 17 of the detector 2. After the pin pin 17 of the detector 2 passes through the detector pin through hole 21, the position of the circuit board through hole 27 of the circuit board 6 is adjusted at the same time, so that the circuit board through hole 27 can be adapted to the pin pin 17, and the pin pin 17 is adapted to the circuit board through hole 27. After the pin pin 17 is adapted to the circuit board through hole 27, welding connection is performed. The support structure mounting surface 19 where the pin pin 17 is located is fixedly connected with the detector mounting surface 20 of the support structure assembly 4 by bonding or the like, and the first baffle mounting surface 18 where the photosensitive pixel area 16 of the detector 2 is located is flush with the top surface of the detector seat support structure 22, which shortens the distance from the photosensitive pixel area 16 of the detector 2 to the reflective mirror surface 14.

[0041] The side of the circuit board 6 fixed to the support structure assembly 4 is the second circuit board mounting surface 28, and the second circuit board mounting surface 28 is fixedly connected to the first circuit board mounting surface 24 by bonding or other means. The circuit board 6 can include different electrical components and modules according to actual conditions.

[0042] After the through hole 27 of the circuit board 6 is adapted to the pin 17 of the detector, a welding connection is performed;

[0043] The module assembly cover plate 7 includes a second cover plate mounting surface 29 assembled with the support structure assembly 4 , and the second cover plate mounting surface 29 is fixedly connected to the first cover plate mounting surface 25 by bonding or other methods.

[0044] Further, see Fig. 9 The module assembly cover plate 7 is provided with a limiting boss structure 30 around the side surface opposite to the circuit board 6, namely, the second cover plate mounting surface 29. The limiting boss structure 30 cooperates with the inner edge of the first cover plate mounting surface 25 for limiting.

[0045] The stray light blocking sheet 8 is provided with a baffle light through hole 32 that matches the size of the photosensitive pixel area 16. After the baffle light through hole 32 is aligned with the photosensitive pixel area 16, it is ensured that the photosensitive pixel area 16 of the detector 2 can be completely exposed through the light through hole 32 of the stray light blocking sheet 8, and the system light will not be blocked by the stray light blocking sheet 8. The second baffle mounting surface 31 of the stray light blocking sheet 8 and the first baffle mounting surface 18 of the detector 2 are fixedly connected by bonding or the like.

[0046] The stray light shielding piece 8 needs to be treated by any one or any combination of stray light treatment methods such as blackening, painting or coating. It should be noted that the stray light treatment methods are not limited to the above methods, as long as they can eliminate stray light and do not damage the structure of the stray light shielding piece.

[0047] It should be noted that the fixing method between the detector 2 and the supporting structure assembly 4, between the circuit board 6 and the supporting structure assembly 4, between the module assembly cover plate 7 and the supporting structure assembly 4, and between the stray light baffle 8 and the detector 2 is not limited to adhesive connection, as long as the fastening effect can be achieved without damaging the detector 2, the supporting structure assembly 4, the circuit board 6, the module assembly cover plate 7, and the stray light baffle 8.

[0048] Two opposite sides of the support structure assembly 4 are provided with support structure external mounting surfaces 23, and the support structure external mounting surfaces 23 are provided with support structure external mounting interfaces 26 for fixing with the focal plane substrate 1. The number of the support structure external mounting interfaces 26 can be selected according to actual needs, for example, each support structure external mounting surface 23 is provided with two support structure external mounting interfaces 26 to achieve stable fixation of the support structure assembly 4.

[0049] A detector module assembly 33 is fixedly mounted on each substrate light through hole 9 through the mounting threaded hole 13 and the external mounting interface 26 of the support structure, and the detector seat support structure 22 in the mounted detector module assembly 33 passes through the corresponding substrate light through hole 9 from the side where the mounting boss is located. After the detector module assembly 33 is mounted on the focal plane substrate 1, the detector seat support structure 22 can be fully extended out of the substrate light through hole 9 on the focal plane substrate 1, so that the distance from the photosensitive pixel area 16 of the detector 2 to the reflective mirror surface 14 can be shortened.

[0050] Specifically, two of the detector module assemblies 33 are installed on the direct surface mounting boss 11 of the focal plane substrate 1 through the supporting structure's external mounting interface 26 and the adjusting gasket group 5, thereby completing the installation of the detector module assembly on the direct surface side of the focal plane; the remaining detector module assembly 33 is installed on the reflective surface mounting boss 12 of the focal plane substrate 1 through the supporting structure's external mounting interface 26 and the adjusting gasket group 5, thereby completing the installation of the detector module assembly on the reflective surface side of the focal plane.

[0051] The adjustment gasket set 5 includes at least one set of two gaskets, which are mounted between the external mounting surface 23 of the support structure of the support structure assembly 4 and the direct surface mounting boss 11 or the reflective surface mounting boss 12 of the focal plane substrate 1. The adjustment gasket set 5 in the present invention replaces the original adjustment gasket between the detector and the substrate, which can shorten the distance between the photosensitive surface of the detector and the mirror surface of the reflector. The position of the detector can be adjusted by repairing the adjustment gasket set 5, thereby further improving the focal plane splicing accuracy.

[0052] Furthermore, the focal plane substrate 1, the supporting structure assembly 4, the adjustment gasket set 5, the module assembly cover 7 and the stray light shielding sheet 8 should be made of the same material to ensure that the thermal expansion coefficient is consistent and to avoid the accumulation of thermal stress.

[0053] The assembly relationship of the total reflection optical splicing focal plane structure proposed by the present invention is described below:

[0054] First, the detector 2 is bonded to the detector mounting surface 20 of the support structure assembly 4 through the support structure mounting surface 19, and the pin 17 of the detector 2 passes through the detector pin through hole 21 of the support structure assembly 4;

[0055] Then, the circuit board 6 is bonded to the support structure assembly 4, and the first circuit board mounting surface 24 of the support structure assembly 4 is bonded to the second circuit board mounting surface 28. During the bonding process between the circuit board 6 and the support structure assembly 4, the position of the circuit board through hole 27 should be adjusted so that the circuit board through hole 27 can be matched with the pin 17 of the detector 2. After matching, the two are welded together.

[0056] The second cover plate mounting surface 29 of the module assembly cover plate 7 is connected to the first cover plate mounting surface 25 of the support structure assembly 4 by bonding, and the limiting boss structure 30 of the module assembly cover plate 7 is used for matching and limiting;

[0057] The stray light shielding sheet 8 is bonded to the first shielding sheet mounting surface 18 of the detector 2, and it is necessary to ensure that the photosensitive pixel area 16 of the detector 2 is completely exposed through the shielding sheet light holes 32 of the stray light shielding sheet 8, and the system light is not blocked;

[0058] According to the above method, the detector module assembly 33 is assembled one by one. The structure of the detector module assembly 33 is as follows: Fig.11 As shown, in this embodiment, the number of optical splicing detectors is 3, of which 2 are direct surface detectors and 1 is reflective surface detector, that is, this embodiment includes 3 sets of detector module assemblies 33;

[0059] The two detector module assemblies 33 are installed on the direct surface mounting boss 11 of the focal plane substrate 1 through the support structure external mounting interface 26 of the support structure assembly 4 and the adjustment gasket assembly 5, thereby completing the installation of the detector module assembly on the direct surface side of the focal plane;

[0060] A detector module assembly 33 is installed on the reflective surface mounting boss 12 of the focal plane substrate 1 through the support structure external mounting interface 26 of the support structure assembly 4 and the adjustment gasket assembly 5, thereby completing the installation of the detector module assembly on the reflective surface side of the focal plane;

[0061] The position of the detector is adjusted by repairing and adjusting the gasket group 5, so as to achieve high-precision splicing of the focal plane;

[0062] After completing the above steps, the total reflection optical splicing focal plane structure proposed in this embodiment that can improve the utilization rate of detector pixels can be obtained.

[0063] The present invention provides a total reflection optical splicing focal plane structure that can improve the utilization rate of detector pixels. By changing the structural configuration of the focal plane components and the assembly method between the focal plane components, especially the assembly method between the detector and the support structure component, and the detector and the focal plane substrate, the focal plane substrate structure is adjusted to expand the light hole size of the substrate, so that the detector and the detector seat support structure can pass through the substrate wall, so that the detector photosensitive surface moves forward in the reverse direction along the incident direction of the light, and the detector support structure is placed at the back of the detector tube shell, eliminating the thickness of the detector support seat and the adjustment gasket, further shortening the distance from the focal plane detector photosensitive pixel surface to the reflector mirror surface, reducing the field width corresponding to the focal plane vignetting area, and then reducing the overlap area width of adjacent detectors, thereby improving the detector pixel utilization rate of the total reflection optical splicing focal plane. At the same time, the present invention helps to reduce the number of detectors used in the wide-width optical splicing focal plane, while reducing the structural components, electronic equipment and even subsequent image processing workload of the detector, reducing the production cost of wide-width cameras, and improving the economic benefits of camera mass production.

[0064] For the total reflection optical splicing focal plane, the size of the focal plane vignetting zone is related to the distance L between the reflector and the photosensitive surface of the detector. The smaller the L value, the smaller the vignetting zone. Since the detector has no external mounting interface, it needs to be bonded to the detector support seat as a whole, and the detector support seat provides an external interface to connect to the substrate. In the past, conventional focal plane structures bonded the tube shell surface of the detector close to the photosensitive surface to the detector seat, and then the detector seat and the adjustment gasket were connected to the substrate by screws. The distance L value is usually greater than the sum of the thickness of the substrate and the thickness of the detector seat. Due to the structural volume of the detector support seat, the adjustment gasket and the substrate, the distance L value cannot be further reduced.

[0065] like Fig.12 As shown, Figure (a) is a conventional focal plane structure, including a conventional focal plane substrate, a detector, a reflector assembly and a supporting structure assembly, and the distance between the reflector and the photosensitive surface is L1, and Figure (b) is a focal plane structure in an embodiment of the present invention, and the distance between the reflector and the focal plane photosensitive surface is L2. The model distance is measured to obtain L1 = 31.7mm, L2 = 21.7mm.

[0066] In order to illustrate the actual improvement effect of the present invention on the focal plane vignetting phenomenon and to further illustrate the reduction effect of the present invention on the overlapping pixel area of ​​the detector, an optical system model is introduced, and the vignetting area field range of the conventional focal plane structure and the focal plane structure of the present invention is measured and compared.

[0067] L1 = 31.7mm, 0° field of view, the field width angle corresponding to the vignetting area is:

[0068] 2.21°-1.77°=0.44°, e.g. Fig.13 As shown, the colored ring in Figure (a) is the light spot presented by the reflective mirror under a 1.77° field of view, and the colored ring in Figure (b) is the light spot presented by the reflective mirror under a 2.21° field of view.

[0069] When L2 = 21.7mm and the field of view is 0°, the field width angle corresponding to the vignetting area is:

[0070] 2.23°-1.89°=0.34°, e.g. Fig.14 As shown, the colored ring in Figure (a) is the light spot presented by the reflective mirror under a 1.89° field of view, and the colored ring in Figure (b) is the light spot presented by the reflective mirror under a 2.23° field of view.

[0071] After calculation, it can be found that compared with the conventional focal plane structure, the field width corresponding to the vignetting area of ​​the present invention is reduced by 22.7%. Generally, the overlap width of the detector pixel is proportional to the field width corresponding to the vignetting area. It can be seen that the overlap width of the detector is reduced by 22.7%. This proves the actual beneficial effect of the present invention on improving the utilization rate of the detector pixel.

[0072] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A total reflection optical splicing focal plane structure, characterized in that: It comprises a focal plane substrate (1), a reflector assembly (3) and at least two detector module assemblies (33); Each detector module assembly (33) comprises a detector (2), a support structure assembly (4), an adjustment gasket group (5), a circuit board (6), a module assembly cover plate (7) and a stray light shielding plate (8); a first cover plate mounting surface (25) and a first circuit board mounting surface (24) located inside the first cover plate mounting surface (25) are provided on one side surface of the support structure assembly (4); a detector seat support structure (22) is provided on the other opposite side surface; a detector mounting surface (20) and a detector pin through hole (21) are provided inside the detector seat support structure (22); a plug pin (17) of the detector (2) passes through the detector pin through hole (21) and is welded and fixed to the circuit board through hole (27) on the circuit board (6); a support structure mounting surface (19) where the plug pin (17) is located is fixed to the detector mounting surface (20) The detector (2) is connected to the first baffle mounting surface (18) where the photosensitive pixel area (16) of the detector (2) is located and is flush with the top surface of the detector seat support structure (22); the second circuit board mounting surface (28) of the circuit board (6) is fixedly connected to the first circuit board mounting surface (24); the module component cover plate (7) is fixedly connected to the first cover plate mounting surface (25); a baffle light through hole (32) matching the size of the photosensitive pixel area (16) is provided on the stray light blocking baffle (8); after the baffle light through hole (32) is aligned with the photosensitive pixel area (16), the stray light blocking baffle (8) is fixedly connected to the first baffle mounting surface (18); two opposite side edges of the support structure component (4) are provided with support structure external mounting surfaces (23); and the support structure external mounting surfaces (23) are provided with support structure external mounting interfaces (26) for fixing to the focal plane substrate (1); The focal plane substrate (1) comprises a direct surface detector mounting plate, a reflective surface detector mounting plate and a reflector mounting surface (10) located therebetween, the direct surface detector mounting plate and the reflective surface detector mounting plate respectively being provided with at least one substrate light through hole (9), a reflector assembly (3) being mounted on the reflector mounting surface (10), and a pair of mounting bosses with mounting threaded holes (13) being respectively disposed on both sides of each substrate light through hole (9) on the side of the direct surface detector mounting plate and the reflective surface detector mounting plate facing away from the reflector assembly (3), the size of each substrate light through hole (9) being The dimensions of the detector seat support structure (22) are larger than the characteristic outer contour dimensions of the detector seat support structure (22); a detector module assembly (33) is fixedly mounted on each substrate light through hole (9) through a mounting threaded hole (13), an adjustment gasket group (5) and an external mounting interface (26) of the support structure; the adjustment gasket group (5) includes two gaskets, both of which are mounted between the external mounting surface (23) of the support structure and the mounting boss of the focal plane substrate (1); and the detector seat support structure (22) in the mounted detector module assembly (33) passes through the corresponding substrate light through hole (9) from the side where the mounting boss is located.

2. The total reflection optical splicing focal plane structure according to claim 1, characterized in that: The number of detector module assemblies (33) is three, two substrate light through holes (9) are arranged on the direct-irradiation surface detector mounting plate, and the reflector mounting surface (10) is located between the two substrate light through holes (9).

3. A total reflection optical splicing focal plane structure according to claim 1 or 2, characterized in that: The focal plane substrate (1), the supporting structure component (4), the mounting and adjusting gasket set (5), the module component cover plate (7) and the stray light blocking plate (8) are made of the same material.

4. A total reflection optical splicing focal plane structure according to claim 1 or 2, characterized in that: The module assembly cover plate (7) is provided with a limiting boss structure (30) around the side surface opposite to the circuit board (6), and the limiting boss structure (30) cooperates with the inner edge of the first cover plate mounting surface (25) for limiting.

5. A total reflection optical splicing focal plane structure according to claim 1 or 2, characterized in that: Two supporting structure external mounting interfaces (26) are provided on the external mounting surface (23) of each supporting structure.

6. A total reflection optical splicing focal plane structure according to claim 1 or 2, characterized in that: The side edges of the direct-surface detector mounting plate and the reflective-surface detector mounting plate are connected and are perpendicular to each other.

7. A total reflection optical splicing focal plane structure according to claim 1 or 2, characterized in that: The stray light eliminating baffle (8) is a baffle that has been treated to eliminate stray light. The stray light eliminating treatment method includes any one of black dyeing, painting, and coating, or any combination of the above.

8. A total reflection optical splicing focal plane structure according to claim 1 or 2, characterized in that: The support structure mounting surface (19) and the detector mounting surface (20) are fixed by bonding.

9. A total reflection optical splicing focal plane structure according to claim 1 or 2, characterized in that: The second circuit board mounting surface (28) and the first circuit board mounting surface (24) are fixed by bonding.

10. A total reflection optical splicing focal plane structure according to claim 1 or 2, characterized in that: The module assembly cover plate (7) and the first cover plate mounting surface (25) are fixed by bonding.

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