A deployable two-stage light shield for a large field of view space exploration camera

Abstract

The application provides a deployable two-stage light shield for a large field of view space detection camera, and aims to solve the technical problem that the existing light shield for the large field of view space detection camera is generally in an integrated rigid structure or a partially component deployable form, and does not have the whole deployable function. The deployable two-stage light shield for the large field of view space detection camera is provided, and the strip-shaped spring of a solar light blocking plate and a ground gas light shield is folded in advance during the satellite launching process of the camera load, and the solar light blocking plate and the ground gas light shield in the completely folded state are bound and locked through the corresponding locking ropes, so that a smaller space volume is achieved during the launching process. Meanwhile, the pre-tension is applied to the corresponding locking ropes through the fuse line device, and the corresponding locking ropes are fused and broken through the fuse line device at the preset moment, so that the solar light blocking plate and the ground gas light shield are sequentially and respectively unlocked, and the solar stray light and the ground gas stray light are shielded, thereby meeting the working environment requirement of the large field of view space detection camera.

Description

Technical Field

[0001] This invention relates to optical hoods, and more specifically to a deployable secondary hood adapted to a large field-of-view spatial exploration camera. Background Technology

[0002] With the increasing number of space missions, the amount of space debris is growing dramatically, placing higher demands on space debris detection missions. To improve detection efficiency, the field of view of space probe cameras needs to be continuously increased. However, interference from solar stray light and Earth-atmosphere stray light during on-orbit operation also intensifies, placing more stringent demands on the stray light suppression capabilities of the sunshade. High stray light suppression capabilities typically rely on longer sunshade lengths. For large-field-of-view space probe cameras, to avoid obstructing the field of view, the radial dimension of the sunshade must expand rapidly along the axial direction, which leads to a significant increase in the overall geometric envelope. Under the strictly limited space constraints of the launch vehicle fairing, traditional first-stage sunshades are often difficult to apply directly due to their excessively large envelope.

[0003] To address this issue, the industry currently employs a two-stage sunshade solution. This involves adding a solar shield and a ground-atmosphere shield to the front of the traditional first-stage sunshade, significantly improving the suppression of stray light from specific directions while effectively reducing the envelope volume. However, the solar shield and ground-atmosphere shield of the second-stage sunshade often have different configurations and require sufficient space for installation. A one-piece configuration is difficult to meet the rocket's envelope space constraints. Therefore, introducing the concept of foldable design into the second-stage sunshade, allowing both the solar shield and ground-atmosphere shield to fold and retract during launch and then unfold separately after orbit insertion, represents a new approach to overcoming these size constraints.

[0004] Currently, most light shields for space exploration cameras are cylindrical or planar in shape. Cylindrical light shields are typically suitable for space camera payloads with small fields of view, while planar light shields are generally suitable for orbital payloads with constant solar correlation. For large-size second-stage light shields suitable for space exploration cameras with wide fields of view, those currently in orbit are usually integral rigid structures or partially deployable components, lacking overall deployable capability. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problem that existing light shields adapted to large field-of-view spatial exploration cameras are usually one-piece rigid structures or partially deployable components, and do not have overall deployable functionality. The invention provides a deployable secondary light shield adapted to large field-of-view spatial exploration cameras.

[0006] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0007] A deployable secondary sunshade adapted to a large field-of-view space exploration camera is characterized by including a solar shield, an atmospheric shield, and M locking ropes.

[0008] The solar shield includes a base, a nano-anti-glare multilayer, a first spring assembly, and a clamping rod.

[0009] The upper surface of the base is uniformly provided with M first rope-winding grooves in the circumferential direction, where M≥3;

[0010] The first spring assembly includes N parallel first strip springs, where N ≥ 2; one end of each of the N first strip springs is connected to one side edge of the base, and the other end is connected together by a clamping rod.

[0011] The nano-dulling multilayer is wrapped inside the first spring assembly, and the two sides extend beyond the first spring assembly to form a symmetrical extended envelope; the width of the extended envelope is set to decrease from bottom to top, the lower outer ends of the two extended envelopes are fixed to the two sides of the upper surface of the base, and the middle part of the lower end of the two extended envelopes is separated from the corresponding position of the upper surface of the base.

[0012] The ground-level light-shielding cover includes multiple layers of black matte paint, P light-blocking rings, and P sets of second spring assemblies, where P ≥ 3;

[0013] Each set of second spring assemblies includes Q second strip springs evenly distributed circumferentially, where Q ≥ 3; P light-blocking rings evenly distributed axially, with adjacent light-blocking rings connected by a set of Q second strip springs; the upper surface of the uppermost light-blocking ring is connected to the lower surface of the base by a set of Q second strip springs, and the lowermost light-blocking ring is used to connect to the front flange of the camera; each light-blocking ring and the base are provided with light-transmitting holes; a multi-layered black matte paint is integrally covered on the outside of the P light-blocking rings and extends to the lower surface of the base; the lower surface of the lowermost light-blocking ring is circumferentially provided with M second rope-winding grooves corresponding one-to-one with M first rope-winding grooves, and M wire-welding devices;

[0014] The locking ropes are closed-loop ropes. One end of one locking rope is attached to the corresponding first winding groove and pressing rod, and the other end passes through P light-blocking rings in sequence before being attached to the corresponding second winding groove and welding device. One end of the remaining M-1 locking ropes is attached to the corresponding first winding groove, and the other end passes through P light-blocking rings in sequence before being attached to the corresponding second winding groove and welding device. This is used to keep the first spring assembly and each of the second spring assemblies in a folded state, so as to realize the folding and locking of the solar sun-blocking plate and the ground-atmosphere shading cover. The M welding devices are used to apply pretension to the corresponding locking ropes to melt the corresponding locking ropes at a preset time, so as to realize the unfolding of the solar sun-blocking plate and the ground-atmosphere shading cover.

[0015] Furthermore, each of the light-blocking rings has M limiting blocks evenly distributed circumferentially on its upper surface, which are used to limit the distance between two adjacent light-blocking rings when the ground-level light-blocking shield is fully retracted.

[0016] Furthermore, the welding wire device includes a groove mounting base, a sliding pin base, two tension springs, two sliding pins, and a heating wire;

[0017] The slide rail mounting base is fixed to the lower surface of the lowest light-blocking ring;

[0018] One end of each of the two sliding pins passes through the sliding pin seat, the corresponding tension spring, and the slide groove mounting seat in sequence, and extends out of the slide groove mounting seat;

[0019] One end of the heating wire is connected to one end of the sliding pin extending out of the groove mounting seat, and the other end is connected to the other end of the sliding pin extending out of the groove mounting seat after passing over the corresponding locking rope. Under the action of the tension spring, the heating wire and the corresponding locking rope are in a tight fit.

[0020] Furthermore, the clamping rod is provided with a rope groove, and each light-blocking ring is provided with a rope winding hole corresponding to the position of each limiting block;

[0021] One end of one of the locking ropes is hooked onto the corresponding first winding groove and the rope groove of the clamping rod; the other ends of the M locking ropes pass through the corresponding winding holes on each light-blocking ring in sequence, and are hooked onto the corresponding second winding groove and the heating wire of the melting wire device.

[0022] Furthermore, the first strip spring is a double-layer strip spring;

[0023] The second strip spring is a single-layer strip spring.

[0024] Furthermore, the two ends of the second strip spring are respectively installed on two adjacent light-blocking rings by screws, or the two ends are respectively installed on the light-blocking ring and the base by screws.

[0025] Furthermore, the nano-matte multilayer is a multilayer heat insulation component, the inner surface of the nano-matte multilayer is bonded to the first spring component, and the outer surface is provided with a black carbon nano-flocked black film.

[0026] The black matte multilayer paint is a multilayer heat insulation component. The inner surface of the black matte multilayer paint is attached to the outer wall of the P light-blocking rings, and the outer surface is sprayed with matte black paint.

[0027] Furthermore, both the nano-matte multilayer and the black paint matte multilayer are coated with aluminum polyester film on both sides.

[0028] Furthermore, M=4, N=3; P=5, Q=3.

[0029] Furthermore, the five light-blocking rings are designated from top to bottom as the first light-blocking ring, the second light-blocking ring, the third light-blocking ring, the fourth light-blocking ring, and the fifth light-blocking ring;

[0030] The position between the lower surface of the base and the third light ring corresponding to the black matte multi-layer lacquer is marked as the first crease segment, and the position between the third light ring and the fifth light ring corresponding to it is marked as the second crease segment;

[0031] The first crease segment is a cylindrical structure, and the second crease segment is a conical structure that is larger at the top and smaller at the bottom.

[0032] Compared with the prior art, the present invention has the following beneficial technical effects:

[0033] 1. This invention provides a deployable secondary sunshade adapted for a large field-of-view space exploration camera. It innovatively uses a solar shield driven by a strip spring and an atmospheric shield to form two sunshades with different configurations, used to block stray light from the atmospheric surface and solar energy in orbit, respectively. During the camera payload's launch with the satellite, the strip springs of the solar shield and atmospheric shield are pre-folded, and the fully folded solar shield and atmospheric shield are secured with corresponding locking ropes, achieving a smaller spatial volume during launch. Simultaneously, four fused wire devices installed on the lower surface of the bottom light-blocking ring apply pre-tension to the corresponding locking ropes. After the camera payload is launched into orbit with the satellite, the fused wire devices melt the corresponding locking ropes, sequentially unlocking the solar shield and atmospheric shield to obtain the fully deployed configuration of the deployable secondary sunshade, thereby blocking stray light from the sun and atmospheric surface, meeting the working environment requirements of a large field-of-view space exploration camera, and also providing a reference for deployable structures in other research fields, such as satellite solar panels.

[0034] 2. The present invention provides a deployable two-stage light shield adapted to a large field-of-view space exploration camera. Both stages of the drive are driven by lightweight strip springs to achieve passive drive. At the same time, flexible light shielding films such as nano-moisture multilayer and black paint moisture multilayer are used to suppress solar stray light and ground-atmosphere stray light. This not only greatly reduces the system weight of the light shield, but also effectively ensures the rigidity of the fully deployed configuration of the light shield.

[0035] 3. The present invention provides a deployable secondary sunshade adapted to a large field-of-view space exploration camera. The locking mechanism adopts a compression and release scheme using locking ropes and a fused wire device. Compared with the traditional pyrotechnic unlocking method, it is impact-free, and compared with the shape memory alloy unlocking method, it is lighter in weight. It can effectively ensure the reliable locking of the sunshade during the launch phase and the smooth unlocking and deployment in orbit. Attached Figure Description

[0036] Figure 1This is a schematic diagram illustrating the design principle of a deployable secondary light shield adapted to a large field-of-view spatial exploration camera according to the present invention.

[0037] Figure 2 This is a schematic diagram of an embodiment of a deployable secondary light shield adapted to a large field-of-view spatial exploration camera according to the present invention.

[0038] Figure 3 This is a schematic diagram of the solar shield in its fully deployed state in an embodiment of the present invention (the nano-extinction multilayer is not shown).

[0039] Figure 4 This is a schematic diagram of the solar shield in its retracted state in an embodiment of the present invention (the nano-anti-glare multilayer is not shown).

[0040] Figure 5 This is a schematic diagram of the ground-level light-shielding cover in its fully deployed state in an embodiment of the present invention (the multi-layered black matte paint and the limiting block are not shown).

[0041] Figure 6 This is a schematic diagram of the ground-level light-shielding cover in its retracted state in an embodiment of the present invention (multi-layered matte black paint is not shown).

[0042] Figure 7 This is a schematic diagram of the first fold line of the multi-layered matte black paint in an embodiment of the present invention.

[0043] Figure 8 This is a schematic diagram of the second fold line of the multi-layered matte black paint in an embodiment of the present invention.

[0044] Figure 9 This is a schematic diagram of the unfolding process of the first and second crease segments of the multi-layered matte black paint in an embodiment of the present invention;

[0045] Figure 10 This is a schematic diagram of the fuse device in an embodiment of the present invention;

[0046] Figure 11 This is a schematic diagram of a double-layer strip spring used as the first strip spring in an embodiment of the present invention, wherein (a) is a cross-sectional view of the double-layer strip spring, (b) is a schematic diagram of the double-layer strip spring in a folded state, and (c) is a schematic diagram of the double-layer strip spring in an unfolded, stable, and self-locking state.

[0047] Figure 12 This is a schematic diagram of a single-layer strip spring used as the second strip spring in an embodiment of the present invention, wherein (a) is a cross-sectional view of the single-layer strip spring, (b) is a schematic diagram of the folded state of the single-layer strip spring, and (c) is a schematic diagram of the unfolded, stable, and self-locking state of the single-layer strip spring.

[0048] Figure 13 This is a schematic diagram of the fully retracted state according to an embodiment of the present invention.

[0049] The annotations in the attached figures are explained as follows:

[0050] 1-Sunlight blocking plate, 11-Base, 12-Nano matte multi-layer, 13-First strip spring, 14-Pressure rod, 15-First rope winding groove; 2-Ground air shading cover, 21-Black matte multi-layer, 211-First crease section, 212-Second crease section, 22-Light blocking ring, 23-Second strip spring, 24-Limiting block, 25-Second rope winding groove; 3-Locking rope; 4-Welding device, 41-Groove mounting base, 42-Sliding pin seat, 43-Tension spring, 44-Sliding pin, 45-Heating wire. Detailed Implementation

[0051] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0052] This invention addresses the need for suppressing solar stray light and Earth-atmosphere stray light in the operational state of large field-of-view space exploration cameras, and proposes a deployable secondary sunshade adapted for large field-of-view space exploration cameras, such as... Figure 1 As shown, it mainly consists of two parts: a solar shield 1 and a ground-atmosphere shield 2. Here, α represents the camera's field of view. Considering the harsh working environment required for a large field-of-view space exploration camera, the solar shield 1 needs to be designed with a slanted conical envelope configuration and meet the design requirements for a solar stray light suppression angle β1. Simultaneously, the light-blocking rings inside the ground-atmosphere shield 2 need to be adapted to the conical distribution of the large field of view and meet the design requirements for a ground-atmosphere stray light suppression angle β2. If only a single-stage shield is used under large field-of-view conditions, the diameter of the shield's front end would need to be extended beyond the payload envelope to simultaneously meet the design requirements for both solar stray light suppression angle β1 and ground-atmosphere stray light suppression angle β2. Therefore, this invention assigns the suppression functions of solar stray light and ground-atmosphere stray light to the two-stage front-end components, the solar shield 1 and the ground-atmosphere shield 2, respectively. This avoids the problem of an excessively large single-stage shield and further solves the housing problem of the second-stage configuration during the launch phase through a deployable design.

[0053] like Figure 2 As shown, a deployable secondary sunshade adapted to a large field-of-view space exploration camera includes a solar shield 1, an atmospheric shield 2, four locking ropes 3, and four fused wire devices 4. One end of the atmospheric shield 2 is mounted on the front flange of the camera to block stray light from the Earth's atmosphere, while the solar shield 1 is mounted on the other end of the atmospheric shield 2 to block stray solar light in orbit.

[0054] like Figures 2-4As shown, the solar shield 1 includes a base 11, a nano-anti-glare multilayer 12, a first spring assembly, and a clamping rod 14. The base 11 has light-transmitting holes, and four first rope-winding grooves 15 are evenly distributed circumferentially on its upper surface. The first spring assembly includes three parallel first strip springs 13. One end of each of the three first strip springs 13 is connected to one side edge of the base 11, and the other end is connected together by the clamping rod 14, thus combining the three first strip springs 13 into a single unit to improve the deployment driving torque.

[0055] The nano-matte multilayer 12 is a multilayer heat insulation component. In this embodiment, a multilayer heat insulation component with double-sided aluminized polyester film commonly used in aerospace is selected. The nano-matte multilayer 12 covers the inner side of the first spring assembly, and its two sides extend beyond the first spring assembly to form symmetrical extended envelopes. The width of the extended envelopes decreases from bottom to top, and is designed to form a slanted conical envelope after the first spring assembly is unfolded and driven into place to block stray solar light. Specifically, the inner surface of the nano-matte multilayer 12 is attached to the first spring assembly, and the outer surface is provided with a black carbon nanoparticle flocked black film with a high absorption rate of >99%. The lower outer ends of the two extended envelopes are respectively fixed to the two sides of the upper surface of the base 11. The middle part of the lower end of the two extended envelopes is separated from the corresponding position on the upper surface of the base 11, so as to realize the simultaneous folding and retraction of the nano-matte multilayer 12 and its extended envelopes when the first spring assembly is folded.

[0056] like Figure 5 , Figure 6 As shown, the ground-level light-shielding cover 2 includes a multi-layered black matte finish 21, five light-blocking rings 22, five sets of second spring assemblies, and five sets of limiting devices. Each set of second spring assemblies includes three circumferentially distributed second strip springs 23. The five light-blocking rings 22 are evenly distributed axially, and adjacent light-blocking rings 22 are connected by a set of three second strip springs 23. The upper surface of the uppermost light-blocking ring 22 is connected to the lower surface of the base 11 by a set of three second strip springs 23, and the lower surface of the lowermost light-blocking ring 22 is used for direct connection to the front flange of the camera. Specifically, the two ends of the second strip springs 23 are respectively installed to two adjacent light-blocking rings 2 by screws, or their two ends are respectively installed to the light-blocking rings 2 and the base 11 by screws. Each light-blocking ring 22 and the base 11 are provided with light-transmitting holes to form the camera's observation field of view.

[0057] The matte black paint multilayer 21 is also a multilayer heat insulation component. In this embodiment, a multilayer heat insulation component with double-sided aluminized polyester film commonly used in aerospace is selected. The matte black paint multilayer 21 completely covers the outside of the five light-blocking rings and extends to the lower surface of the base 11. It is used to deploy with the drive of each group of second spring components to block stray light from the ground and prevent external light from entering the field of view. Specifically, the inner surface of the matte black paint multilayer 21 is fitted to the outer wall of the five light-blocking rings, and the outer surface is sprayed with matte black paint, which has a high absorption rate of >98%.

[0058] The five light-blocking rings 22 are sequentially labeled from top to bottom as the first light-blocking ring, the second light-blocking ring, the third light-blocking ring, the fourth light-blocking ring, and the fifth light-blocking ring; the position of the black matte multi-layer paint 21 corresponding to the lower surface of the base 11 to the third light-blocking ring is designated as the first crease segment 211, and the position corresponding to the third light-blocking ring to the fifth light-blocking ring is designated as the second crease segment 212. Then, as shown... Figure 7 As shown, the first fold segment 211 of the matte black multilayer 21 is designed as a cylindrical structure, which is a paper-folding pattern symmetrical about the X and Y axes, as shown in the figure. Figure 8 As shown, the second crease segment 212 is designed as a conical cylinder with a larger top and a smaller bottom, which is a symmetrical origami crease pattern around the Y-axis. That is, the outer diameters of the first, second, and third light rings are equal, the outer diameter of the fourth light ring is smaller than that of the third light ring, and the outer diameter of the fifth light ring is smaller than that of the fourth light ring. Figure 9 As shown, the desired barrel-shaped structure of the ground-level light shield 2 can be achieved through the crease design pattern of the first crease segment 211 and the second crease segment 212. In other embodiments of the present invention, when used for a deployable light shield with a small field of view, the position of the black matte multilayer 21 corresponding to the lower surface of the base 11 to the fifth light ring can be designed as a cylindrical structure as needed.

[0059] Preferably, four limiting blocks 24 are evenly distributed circumferentially on the upper surface of each light-blocking ring 22, which are used to limit the distance between two adjacent light-blocking rings 22 when the ground-level light-blocking cover 2 is fully retracted.

[0060] The lower surface of the lowest light-blocking ring 22 is provided with four second rope-winding grooves 25 circumferentially. Four wire-welding devices 4 are respectively provided on the lower surface of the lowest light-blocking ring 22 and correspond one-to-one with each of the second rope-winding grooves 25. At the same time, the clamping rod 14 is provided with a rope groove, and each light-blocking ring 22 is provided with a rope-winding hole corresponding to the position of each limiting block 24. The locking rope 3 is a closed-loop rope used to achieve binding and locking when the solar light-blocking plate 1 and the ground atmosphere sunshade 2 are fully retracted; wherein, the four first rope-winding grooves 15 on the upper surface of the base 11 and the four second rope-winding grooves 25 on the lower surface of the lowest light-blocking ring 22 are used to guide the corresponding locking ropes 3 and change their force direction. Specifically, one end of one locking rope 3 is hooked onto the corresponding first rope winding groove 15 and the rope groove of the clamping rod 14, and the other end passes through the corresponding rope winding holes on the five light-blocking rings 22 in sequence and is hooked onto the corresponding second rope winding groove 25 and the welding wire device 4. One end of the other three locking ropes 3 is hooked onto the corresponding first rope winding groove 15, and the other end passes through the corresponding rope winding holes on the five light-blocking rings 22 in sequence and is hooked onto the corresponding second rope winding groove 25 and the welding wire device 4, so that the first spring assembly and each of the second spring assemblies are in a folded state. When the first spring assembly and each of the second spring assemblies are in a folded state, the solar light blocking plate 1 and the ground atmosphere sunshade 2 are retracted and locked.

[0061] Four welding devices 4 are used to apply pretension to the corresponding locking ropes 3 to melt and break the corresponding locking ropes 25 at a preset time, thereby enabling the deployment of the solar shield 1 and the ground-level sunshade 2. Typically, the preset time includes a first preset time and a second preset time. At the first preset time, the corresponding locking rope 25 of the solar shield 1 is melted by the corresponding welding device 4, enabling the solar shield 1 to deploy. The moment the solar shield 1 is fully deployed is the second preset time. At this time, the other three welding devices 4 melt and break the three locking ropes 25 corresponding to the ground-level sunshade 2, thereby enabling the ground-level sunshade 2 to deploy.

[0062] like Figure 10As shown, the heating wire device 4 includes a sliding groove mounting base 41, a sliding pin seat 42, two tension springs 43, two sliding pins 44, and a heating wire 45. The sliding groove mounting base 41 is fixed to the lower surface of the lowest light-blocking ring 22; one end of each of the two sliding pins 44 passes through the sliding pin seat 42, the corresponding tension spring 43, and the sliding groove mounting base 41 respectively, and extends out of the sliding groove mounting base 41; when the tension spring 43 is in a relaxed state, the distance between the sliding pin seat 42 and the sliding groove mounting base 41 should be maximized. One end of the heating wire 45 is connected to one end of the sliding pin 44 extending into the groove mounting base 41, and the other end is connected to one end of the sliding pin 44 extending into the groove mounting base 41 after passing over the corresponding locking rope 3. Under the action of the tension spring 43, the heating wire 45 and the corresponding locking rope 3 are in a tight fit. That is, the other ends of the four locking ropes 3 pass through the rope winding holes of the corresponding limiting blocks 24 on each light-blocking ring 22 in sequence, and are hung on the heating wire 45 of the corresponding second rope winding groove 25 and the fuser device 4. When the sunshade reaches the expected position and needs to be unlocked, the heating wire 45 of the corresponding fuser device 4 is heated to raise its temperature, thereby melting the corresponding locking rope 3, releasing the locking constraint, and realizing the deployment of the solar sunshade 1 and the ground atmosphere sunshade 2.

[0063] The first strip spring 13 and the second strip spring 23 in this invention are strip springs with a certain degree of curvature. This type of spring is widely used in aerospace deployable structures; it is extremely lightweight and in a stable state when fully deployed. It can be bent and compressed into various shapes by applying external force and return to its fully deployed state. It also has high self-locking stiffness, providing a self-locking function for deployable structures. Commonly used materials for strip springs are deformable and reinforced stainless steel. Since the solar sunshade 1 needs to drive the nano-anti-glare multilayer 12 from its retracted state to the desired oblique conical configuration, its stroke is relatively long and the required torque is large. Therefore, the first strip spring 13 is selected from… Figure 11 The double-layered strip spring shown is Figure 11 Image (a) is a cross-sectional view of a double-layered strip spring. Figure 11 Image (b) shows a schematic diagram of the folded state of a double-layered strip spring, which is approximately spoon-shaped when folded. Figure 11 (c) is a schematic diagram of the double-layered strip spring in its unfolded, stable, and self-locking state. This state is a straightened state, used to provide support stiffness for the nano-extinction multilayer 12. Since the required unfolding length and torque between the light-blocking rings 22 of the ground-level light-shielding cover 2 are relatively small, the second strip spring 23 is selected... Figure 12 The single-layer strip spring shown has its axis evenly distributed. Figure 12 (a) is a cross-sectional view of a single-layer strip spring. Figure 12 Image (b) is a schematic diagram of the folded state of a single-layer strip spring, which is approximately Ω-shaped when folded. Figure 12(c) is a schematic diagram of the unfolded stable self-locking state of a single-layer strip spring. Its unfolded stable self-locking state is the straightened state, which provides self-locking stiffness between each light-blocking ring 22.

[0064] During the camera payload's launch with the satellite, such as Figure 13 As shown, the first spring assembly of the solar shield 1 and the five sets of single-layer spring assemblies of the ground atmosphere shield 2 are pre-folded, and the solar shield 1 and the ground atmosphere shield 2 are bound and locked in the fully folded state by the corresponding locking ropes 3 to achieve a smaller space volume during launch. At the same time, pretension is applied to the corresponding locking ropes 3 by four fusion wire devices 4 installed on the lower surface of the lowest light-blocking ring 22.

[0065] After the camera payload is launched into orbit with the satellite, the solar shield 1 and the Earth atmosphere shield 2 are unlocked sequentially. Specifically, the fuselage device 4 corresponding to the solar shield 1 is energized first, melting the locking rope 3 hanging on the clamping rod 14, so that the solar shield 1, driven by the first spring assembly, pulls the nano-extinction multilayer 12 to unfold into the desired configuration; then the other three fuselage devices 4 are energized, melting the corresponding three locking ropes 3, so that the Earth atmosphere shield 2, driven by multiple second spring assemblies, unfolds each light-blocking ring 22 into the desired configuration and self-locks, thereby pulling the black paint extinction multilayer 21 to unfold, finally achieving the complete unfolded configuration, realizing the external stray light blocking of the secondary shield unfolded configuration.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A deployable secondary light shield adapted to a large field-of-view space exploration camera, characterized in that: Includes a sunshade (1), an atmospheric shading shield (2), and M locking ropes (3); The solar shield (1) includes a base (11), a nano-moistening multilayer (12), a first spring assembly, and a clamping rod (14). The upper surface of the base (11) is uniformly provided with M first rope-winding grooves (15) in the circumferential direction, where M≥3; The first spring assembly includes N parallel first strip springs (13), where N ≥ 2; one end of each of the N first strip springs (13) is connected to one side edge of the base (11), and the other end is connected together by a clamping rod (14); The nano-dulling multilayer (12) covers the inner side of the first spring assembly, and the two sides extend beyond the first spring assembly to form a symmetrical extended envelope; the width of the extended envelope is set to decrease from bottom to top, the lower outer ends of the two extended envelopes are fixed on both sides of the upper surface of the base (11), and the middle part of the lower end of the two extended envelopes is respectively spaced from the corresponding position of the upper surface of the base (11). The ground-level light shield (2) includes a multi-layer black matte paint layer (21), P light-blocking rings (22), and P sets of second spring assemblies, where P ≥ 3; Each set of second spring assemblies includes Q second strip springs (23) evenly distributed circumferentially, Q≥3; P light-blocking rings (22) evenly distributed axially, and adjacent light-blocking rings (22) are connected by a set of Q second strip springs (23); the upper surface of the uppermost light-blocking ring (22) is connected to the lower surface of the base (11) by a set of Q second strip springs (23), and the lowermost light-blocking ring (22) is used to connect to the front flange of the camera; each light-blocking ring (22) and the base (11) are respectively provided with light-transmitting holes; black matte multilayer paint (21) is completely covered on the outside of the P light-blocking rings and extends to the lower surface of the base (11); the lower surface of the lowermost light-blocking ring (22) is circumferentially provided with M second rope-winding grooves (25) corresponding one-to-one with M first rope-winding grooves (15), and M wire-welding devices (4); The locking rope (3) is a closed loop rope. One end of one locking rope (3) is attached to the corresponding first winding groove (15) and the clamping rod (14), and the other end passes through P light-blocking rings (22) and is attached to the corresponding second winding groove (25) and the welding device (4). One end of the remaining M-1 locking ropes (3) is attached to the corresponding first winding groove (15), and the other end passes through P light-blocking rings (22) and is attached to the corresponding second winding groove (25) and the welding device (4). This is used to make the first spring assembly and each second spring assembly folded, so as to realize the folding and locking of the solar light blocking plate (1) and the ground atmosphere shield (2). M welding devices (4) are used to apply pretension to the corresponding locking rope (3) to melt the corresponding locking rope (3) at a preset time, so as to realize the unfolding of the solar light blocking plate (1) and the ground atmosphere shield (2).

2. The deployable secondary light shield for a large field-of-view spatial exploration camera according to claim 1, characterized in that: Each of the light-blocking rings (22) has M limiting blocks (24) evenly distributed around its upper surface, which are used to limit the distance between two adjacent light-blocking rings (22) when the ground-atmosphere light shield (2) is fully retracted.

3. The deployable secondary light shield for a large field-of-view spatial exploration camera according to claim 2, characterized in that: The wire-welding device (4) includes a groove mounting base (41), a sliding pin base (42), two tension springs (43), two sliding pins (44), and a heating wire (45). The slide mounting base (41) is fixed to the lower surface of the lowest light-blocking ring (22); One end of each of the two sliding pins (44) passes through the sliding pin seat (42), the corresponding tension spring (43), and the slide groove mounting seat (41) in sequence, and extends out of the slide groove mounting seat (41). One end of the heating wire (45) is connected to one end of the sliding pin (44) extending out of the groove mounting seat (41), and the other end is connected to one end of the sliding pin (44) extending out of the groove mounting seat (41) after passing over the corresponding locking rope (3). Under the action of the tension spring (43), the heating wire (45) and the corresponding locking rope (3) are in a close fit.

4. The deployable secondary light shield adapted to a large field-of-view spatial exploration camera according to claim 3, characterized in that: The clamping rod (14) is provided with a rope groove, and each light-blocking ring (22) is provided with a rope winding hole corresponding to the position of each limiting block (24); One end of one of the locking ropes (3) is hooked onto the corresponding first winding groove (15) and the rope groove of the clamping rod (14); the other ends of the M locking ropes (3) pass through the corresponding winding holes on each light-blocking ring (22) in sequence, and are hooked onto the corresponding second winding groove (25) and the heating wire (45) of the melting wire device (4).

5. A deployable secondary light shield adapted to a large field-of-view spatial exploration camera according to any one of claims 1-4, characterized in that: The first strip spring (13) is a double-layer strip spring; The second strip spring (23) is a single-layer strip spring.

6. The deployable secondary light shield for a large field-of-view spatial exploration camera according to claim 5, characterized in that: The two ends of the second strip spring (23) are respectively installed on the two adjacent light-blocking rings (2) by screws, or the two ends are respectively installed on the light-blocking ring (2) and the base (11) by screws.

7. The deployable secondary light shield for a large field-of-view spatial exploration camera according to claim 6, characterized in that: The nano-dulling multilayer (12) is a multilayer heat insulation component. The inner surface of the nano-dulling multilayer (12) is attached to the first spring component, and the outer surface is provided with a black carbon nano-flocked black film. The black matte multilayer (21) is a multilayer heat insulation component. The inner surface of the black matte multilayer (21) is attached to the outer wall of the P light-blocking rings (22), and the outer surface is coated with matte black paint.

8. The deployable secondary light shield for a large field-of-view spatial exploration camera according to claim 7, characterized in that: Both the nano matte multilayer (12) and the black matte multilayer (21) are coated with aluminum polyester film on both sides.

9. The deployable secondary light shield for a large field-of-view spatial exploration camera according to claim 1, characterized in that: The values ​​are M=4, N=3, P=5, and Q=3.

10. The deployable secondary light shield for a large field-of-view spatial exploration camera according to claim 9, characterized in that: The five light-blocking rings are numbered from top to bottom as the first light-blocking ring, the second light-blocking ring, the third light-blocking ring, the fourth light-blocking ring, and the fifth light-blocking ring; The position between the lower surface of the base (11) and the third ring of light corresponding to the black matte multilayer paint (21) is recorded as the first crease segment (211), and the position between the third ring of light and the fifth ring of light corresponding to it is recorded as the second crease segment (212). The first crease segment (211) is a cylindrical tube shape, and the second crease segment (212) is a conical tube shape that is larger at the top and smaller at the bottom.

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