A polygonal closed loop inwardly folded columnar light shield system

Abstract

The application provides a polygon closed loop inward folding cylindrical light shield system, comprising: a rigid support structure composed of an upper end rigid boundary and a lower end rigid boundary in a polygon closed loop structure, wherein the two are congruent and arranged in parallel; and a polygonal cylindrical light shielding film arranged between the upper end rigid boundary and the lower end rigid boundary to form a cavity with upper and lower openings, the light shielding film is circumferentially divided into a plurality of rectangular light shielding film pieces, and adjacent film pieces are connected through vertical peak fold lines. Through the polygon closed loop inward folding mechanism, the application realizes the super-compact storage of the strictly directional inward shrinkage of the film, and the storage space is smaller than that of a traditional composite material hard shell type space optical camera light shield.

Description

Technical Field

[0001] This application belongs to the field of light-shielding device technology, and in particular relates to a polygonal closed-loop inwardly folded columnar light-shielding system. Background Technology

[0002] Optical light shield systems have significant application value in airborne and spaceborne optical payloads (especially space telescopes). Their structural dimensions and performance directly affect the image quality of optical spacecraft, making them a key component of optical imaging spacecraft. Their core function is to effectively suppress stray light from external sources such as solar radiation, Earth's thermal radiation, and ground object reflections without obstructing the imaging light within the field of view, thus significantly improving the target's signal-to-noise ratio. As optical systems develop towards higher performance, light shielding devices with high compactness, light weight, and adaptability to specific shape proportions are the ideal forms for future light shields. Traditional cylindrical light shields (such as circular or regular polygonal designs) also have many applications, but they have the following shortcomings: 1) Traditional columnar light shields tend to expand outwards or stack randomly during folding, resulting in a significant increase in the space occupied when stored. 2) The symmetrical structure of the fixed side length of the columnar light shield is difficult to adapt to irregular or irregularly shaped installation space contours (such as equipment compartments, inclined planes, etc.). Although there are some foldable solutions, none of them can achieve strict and only oriented shrinkage of the film towards the central axis of the system, and they lack the ability to independently adjust the length and angle of each side, which seriously limits their application effect in space-constrained or complex contour scenarios. Summary of the Invention

[0003] In view of this, this application aims to propose a polygonal closed-loop inward folding columnar sunshade system to solve the problems of excessive storage volume and poor space adaptability of traditional foldable columnar sunshades.

[0004] To achieve the above objectives, the technical solution of this application is implemented as follows: This application provides a polygonal closed-loop inwardly folded cylindrical light shield system, comprising: A rigid support structure, which consists of an upper rigid boundary and a lower rigid boundary in the form of a polygonal closed loop, wherein the two are congruent and arranged in parallel. A polygonal columnar light-shielding film is installed between the upper rigid boundary and the lower rigid boundary to form a cavity with openings at the top and bottom. The light-shielding film is divided into multiple rectangular light-shielding sheets along the circumference, and adjacent sheets are connected by vertical peak fold lines.

[0005] Furthermore, the upper edge of the light-shielding film is circumferentially fixed to the lower edge of the upper rigid boundary, and the lower edge of the light-shielding film is circumferentially fixed to the upper edge of the lower rigid boundary.

[0006] Furthermore, the number of rectangular light-shielding films, N, is ≥ 3.

[0007] Furthermore, each of the rectangular light-shielding films has a preset crease on its surface, including: Multiple horizontal peak crease lines are arranged in parallel at equal intervals. A horizontal center line is set at the middle position of two adjacent horizontal peak crease lines. The horizontal center line is an auxiliary horizontal crease line. A first oblique valley crease line and a second oblique valley crease line connect the vertical crease line to the horizontal center line, wherein the vertical peak crease line is formed by connecting multiple vertical crease lines, and the first oblique valley crease line and the second oblique valley crease line are mirror images generated along the horizontal center line.

[0008] Furthermore, the angle control of the preset crease includes: The angle formed by the first oblique crease line and the second horizontal crease line is defined, and the angle between the angle and the corresponding rigid boundary segment satisfies the following relationship: .

[0009] Furthermore, in response to adopting a regular polygonal structure, the angle formed by the first diagonal crease line and the second horizontal crease line... ≤60°, the included angle formed between adjacent rigid boundaries ≥60°.

[0010] Furthermore, in response to adopting a regular octagonal structure, the angle formed by the first diagonal crease line and the second horizontal crease line... It is 22.5°; The angle formed between adjacent rigid boundaries It is 135°.

[0011] Furthermore, the light-shielding film is folded inward along the preset crease, and all rectangular light-shielding films are stacked in a self-enclosing manner to be completely accommodated in the cavity between the upper rigid boundary and the lower rigid boundary.

[0012] Furthermore, by separating the upper rigid boundary and the lower rigid boundary, the light-shielding film automatically unfolds under tension, and the polygonal cross-sectional shape is maintained by the vertical peak crease, while the rigid boundary provides stable support.

[0013] Furthermore, the light-shielding film is a polyimide film.

[0014] Compared with the prior art, the polygonal closed-loop inwardly folded columnar light shield system described in this application has the following advantages: 1) The columnar light shield system described in this application achieves ultra-compact storage by strictly oriented inward shrinkage of the thin film through a polygonal closed-loop inward folding mechanism. Compared with the traditional composite material hard shell space optical camera light shield, it occupies less storage space. 2) The columnar light shield system described in this application adopts a polygonal design. The length of each side can be set and adjusted independently during the system design stage, so that it can perfectly adapt to complex irregular spatial contours, while ensuring the stability and high precision of the unfolded state. It is especially suitable for harsh application scenarios with limited space or irregular contours. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a polygonal closed-loop inwardly folding columnar light shield system in the unfolded state, as described in an embodiment of this application. Figure 2 This is a schematic diagram of the three-dimensional structure of the polygonal rigid boundary described in the embodiments of this application; Figure 3 This is a schematic diagram of the polygonal rigid boundary section dimensions as described in the embodiments of this application; Figure 4 This is a schematic diagram of the polygonal columnar light-shielding film described in the embodiments of this application; Figure 5 This is a schematic diagram of the crease of a single unit of the polygonal columnar light-shielding film described in the embodiments of this application; Figure 6 This is a schematic diagram of the unfolded folds of the polygonal columnar light-shielding film described in the embodiments of this application; Figure 7 This is a schematic diagram of the unfolding process of a polygonal closed-loop inwardly folding columnar light shield system as described in the embodiments of this application; Figure 8 This is a schematic diagram of the unfolding process of a polygonal closed-loop inwardly folding columnar light shield system as described in an embodiment of this application.

[0016] Explanation of reference numerals in the attached figures: 1-Polygonal columnar light-shielding film; 2-Upper rigid boundary; 3-Lower rigid boundary. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0018] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0019] Please see Figure 1 As shown, this embodiment provides a polygonal closed-loop inwardly folded cylindrical light shield system, including: A rigid support structure, which consists of an upper rigid boundary and a lower rigid boundary in the form of a polygonal closed loop, wherein the two are congruent and arranged in parallel. A polygonal columnar light-shielding film is installed between an upper rigid boundary and a lower rigid boundary to form a cavity with openings at the top and bottom. The light-shielding film is divided into N rectangular light-shielding films (N≥3) along the circumference, and adjacent films are connected by vertical peak fold lines.

[0020] Specifically, in this embodiment, an upper rigid boundary and a lower rigid boundary with a polygonal closed-loop structure are designed, and a polygonal columnar light-shielding film is set at the middle position of the upper rigid boundary and the lower rigid boundary. The upper edge of the polygonal columnar light-shielding film is circumferentially fixed to the lower edge of the upper rigid boundary, and the lower edge of the polygonal columnar light-shielding film is circumferentially fixed to the upper edge of the lower rigid boundary. The polygonal columnar light-shielding film and the rigid support structure are connected to form a cavity structure with upper and lower openings.

[0021] The polygonal columnar light-shielding film is made of polyimide (PI), which has the characteristics of high temperature resistance, good mechanical strength, corrosion resistance and high light-shielding performance. It is suitable for scenarios with limited space or that need to be adapted to irregular contours (such as spacecraft light shields, precision instrument light-shielding equipment, etc.). The polygonal columnar light-shielding film is divided into multiple rectangular light-shielding films, and adjacent films are connected by vertical peak fold lines.

[0022] During the folding and retraction process, the polygonal columnar light-shielding film folds inward along the preset creases, and all the rectangular light-shielding films are folded together in a self-enclosing manner, ultimately being completely contained within the cavity between the upper and lower rigid boundaries.

[0023] During the unfolding and fixing process, the upper rigid boundary and the lower rigid boundary are separated. The polygonal columnar light-shielding film unfolds automatically under tension, and the polygonal cross-sectional shape is maintained by the vertical peak folds. The rigid boundary provides stable support.

[0024] In this embodiment, the upper and lower rigid boundaries adopt a polygonal design, and the length of each side can be independently set and adjusted during the system design stage. The system can effectively adapt to various regular or irregular spatial contour requirements and has excellent spatial layout adaptability.

[0025] In some embodiments, each rectangular light-shielding film surface is provided with preset creases, including: Multiple horizontal peak crease lines are arranged in parallel at equal intervals. A horizontal center line is set at the middle position of two adjacent horizontal peak crease lines. The horizontal center line is an auxiliary horizontal crease line. The first and second oblique valley fold lines connect the vertical fold lines with the horizontal midline. The vertical peak fold line is formed by connecting multiple vertical fold lines. The first and second oblique valley fold lines are mirror images generated along the horizontal midline.

[0026] This embodiment designs an upper rigid boundary and a lower rigid boundary, and based on the preset crease pattern set on the surface of the rectangular light-shielding film, the film is folded strictly and only towards the direction of the system's central axis (inside), and finally completely folded into the space defined by the upper and lower rigid boundaries, which significantly reduces the spatial volume of the columnar light-shielding system in the stored state.

[0027] In some implementations, the angle control of the preset crease includes: The angle formed by the first oblique crease line and the second horizontal crease line, and the angle between them and the corresponding rigid boundary segments, satisfy the following relationship: .

[0028] In response to the adoption of a regular polygonal structure, the angle formed by the first diagonal crease line and the second horizontal crease line ≤60°, the included angle formed between adjacent rigid boundaries ≥60°.

[0029] In response to the adoption of an irregular polygonal structure, through manual setting... The specific angle can be used to calculate The included angle and the geometric relationships between the parameters are as follows: 。

[0030] This embodiment uses a regular octagonal structure as an example. In this case, the angle formed by the first diagonal crease line and the second horizontal crease line is calculated using the above formula. The included angle between adjacent rigid boundaries is 22.5°. It is 135°.

[0031] Example: Octagonal closed-loop inwardly folded columnar light-blocking system like Figure 1 As shown, the system comprises a polygonal rigid boundary and a polygonal columnar light-shielding film. One is arranged at the upper end of the film (referred to as the upper rigid boundary 2), and the other is arranged at the lower end of the film (referred to as the lower rigid boundary 3). The columnar polygonal film 1 connects the upper and lower rigid boundaries.

[0032] Polygonal Rigid Boundaries: This includes eight rectangular rigid boundaries, corresponding to the eight sides of the polygon: First Rigid Boundary (AA1B1B), Second Rigid Boundary (BB1C1C), Third Rigid Boundary (CC1D1D), Fourth Rigid Boundary (DD1E1E), Fifth Rigid Boundary (EE1F1F), Sixth Rigid Boundary (FF1G1G), Seventh Rigid Boundary (GG1K1K), and Eighth Rigid Boundary (KK1A1A). The top face of polygon ABCDEFGK is congruent to the bottom face of polygon A1B1C1D1E1F1G1K1, as shown below. Figure 2 and Figure 3 As shown.

[0033] like Figure 3 As shown, the following angles are formed between adjacent rigid boundaries: ∠KAB=β1 (eighth boundary and first boundary), ∠ABC=β2 (first boundary and second boundary), ∠BCD=β3 (second boundary and third boundary), ∠CDE=β4 (third boundary and fourth boundary), ∠DEF=β5 (fourth boundary and fifth boundary), ∠EFG=β6 (fifth boundary and sixth boundary), ∠FGK=β7 (sixth boundary and seventh boundary), ∠GKA=β8 (seventh boundary and eighth boundary).

[0034] like Figure 4 As shown, it consists of eight rectangular light-shielding films, the cross-sectional shapes of which are exactly the same as those of the rigid boundary cross-section (the sides and corners correspond one-to-one): the first rectangular light-shielding film (aa1b1b), the second rectangular light-shielding film (bb1c1c), the third rectangular light-shielding film (cc1d1d), the fourth rectangular light-shielding film (dd1e1e), the fifth rectangular light-shielding film (ee1f1f), the sixth rectangular light-shielding film (ff1g1g), the seventh rectangular light-shielding film (gg1k1k), and the eighth rectangular light-shielding film (kk1a1a).

[0035] The side length of each rigid boundary is equal to the width of the corresponding side of its rectangular light-blocking film: AB = ab = , BC=bc= CD=cd= DE=de= EF=ef= FG=fg= GK=gk= KA=ka= .

[0036] Combination Figures 4 to 6 Eight vertical creases are formed at the overlapping edges of adjacent rectangular light-shielding films: the first vertical crease (between kk1a1a and aa1b1b), the second vertical crease (between aa1b1b and bb1c1c), the third vertical crease (between bb1c1c and cc1d1d), the fourth vertical crease (between cc1d1d and dd1e1e), the fifth vertical crease (between dd1e1e and ee1f1f), the sixth vertical crease (between ee1f1f and ff1g1g), the seventh vertical crease (between ff1g1g and gg1k1k), and the eighth vertical crease (between gg1k1k and kk1a1a).

[0037] Each rectangular light-shielding film uses the same crease setting method inside (e.g., ... Figure 5 and Figure 6 (As shown): Horizontal peak crease lines (first horizontal peak crease lines, i.e., ab, a2b2): Multiple lines are provided, parallel to the bottom edge and equally spaced, with a spacing of h. Horizontal midline: Located in the middle of adjacent first horizontal peak crease lines. Sloping valley crease lines: Extend obliquely upwards from the intersection of the first horizontal peak crease line and the first vertical crease line to the horizontal midline (first sloping valley crease line, i.e., aa3), and mirror along this midline to obtain another one (second sloping valley crease line, i.e., a2a3).

[0038] Auxiliary horizontal crease lines: Second horizontal peak crease line (peak crease, i.e., OO2): the midline segment between the right side of the vertical crease line and the left side of the sloping valley crease line; Third horizontal peak crease line (valley crease, i.e., O2O1): the midline segment between the right side of the sloping valley crease line and the left side of the vertical crease line.

[0039] On each rectangular light-shielding film, such as Figure 5 and Figure 6 As shown, the first oblique valley fold line and the second horizontal peak fold line form an angle φ. The included angles of each membrane are: φ1 (first membrane), φ2 (second membrane), φ3 (third membrane), φ4 (fourth membrane), φ5 (fifth membrane), φ6 (sixth membrane), φ7 (seventh membrane), and φ8 (eighth membrane).

[0040] There is a specific geometric relationship between the included angles of these creases φ1-φ8 and the corresponding included angles of the boundary β1-β8: The distance between adjacent first horizontal peak crease lines is h, and the total height of the polygonal columnar light-shielding film is H, satisfying H / h = constant.

[0041] like Figure 2 and Figure 6 As shown, the upper edges (a1b1, b1c1, c1d1, d1e1, e1f1, f1g1, g1k1, k1a1) of each rectangular light-shielding film are fixedly connected to the lower edges (AB, BC, CD, DE, EF, FG, GK, KA) of the corresponding sides of the upper rigid boundary, respectively. The lower edges (ab, bc, cd, de, ef, fg, gk, ka) of each rectangular light-shielding film are fixedly connected to the upper edges (A1B1, B1C1, C1D1, D1E1, E1F1, F1G1, G1K1, K1A1) of the corresponding sides of the upper rigid boundary, respectively.

[0042] like Figure 7 As shown, when folding according to the preset peak and valley folds, all films can be folded inward, and the final folded state can be completely gathered in the space formed between the upper and lower rigid boundaries.

[0043] like Figure 8 As shown, separating the upper and lower rigid boundaries along the axial direction will cause the polygonal columnar light-shielding film to automatically unfold along the preset creases and return to its original state. Figure 1 The unfolded state shown.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not 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 embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

[0045] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A polygonal closed-loop inwardly folded columnar light shield system, characterized in that, include: A rigid support structure, which consists of an upper rigid boundary and a lower rigid boundary in the form of a polygonal closed loop, wherein the two are congruent and arranged in parallel. A polygonal columnar light-shielding film is installed between the upper rigid boundary and the lower rigid boundary to form a cavity with openings at the top and bottom. The light-shielding film is divided into multiple rectangular light-shielding films along the circumference, and adjacent films are connected by vertical peak fold lines. Each of the rectangular light-shielding films has a preset crease on its surface, including: Multiple horizontal peak crease lines are arranged in parallel at equal intervals. A horizontal center line is set at the middle position of two adjacent horizontal peak crease lines. The horizontal center line is an auxiliary horizontal crease line. A first oblique valley fold line and a second oblique valley fold line connect the vertical fold line to the horizontal center line, wherein the vertical peak fold line is formed by connecting multiple vertical fold lines, and the first oblique valley fold line and the second oblique valley fold line are mirror images generated along the horizontal center line; The angle control of the preset crease includes: The angle formed by the first oblique crease line and the second horizontal crease line is defined, and the angle between them and the corresponding rigid boundary segment satisfies the following relationship: ； The light-shielding film is folded inward along the preset crease, and all rectangular light-shielding films are stacked in a self-wrapping manner to be completely accommodated in the cavity between the upper rigid boundary and the lower rigid boundary. The upper rigid boundary and the lower rigid boundary are separated, and the light-shielding film automatically unfolds under tension. The polygonal cross-sectional shape is maintained by the vertical peak crease, and the rigid boundary provides stable support.

2. The polygonal closed-loop inwardly folded columnar light shield system according to claim 1, characterized in that: The upper edge of the light-shielding film is circumferentially fixed to the lower edge of the upper rigid boundary, and the lower edge of the light-shielding film is circumferentially fixed to the upper edge of the lower rigid boundary.

3. The polygonal closed-loop inwardly folded columnar light shield system according to claim 1, characterized in that: The number of rectangular light-blocking films, N ≥ 3.

4. The polygonal closed-loop inwardly folded columnar light shield system according to claim 1, characterized in that: In response to the adoption of a regular polygonal structure, the angle formed by the first oblique crease line and the second horizontal peak crease line ≤60°, the included angle formed between adjacent rigid boundaries ≥60°.

5. A polygonal closed-loop inwardly folded columnar light shield system according to claim 4, characterized in that: In response to the adoption of a regular octagonal structure, the angle formed by the first oblique crease line and the second horizontal peak crease line It is 22.5°; The angle formed between adjacent rigid boundaries It is 135°.

6. The polygonal closed-loop inwardly folded columnar light shield system according to claim 1, characterized in that: The light-shielding film is made of polyimide film.

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