An outward-tilting folding film sunshade system suitable for confined spaces

Abstract

This invention discloses an outward-tilting folding film light shield system suitable for confined spaces. The system consists of a narrow rigid boundary, a left polygonal film, a middle polygonal film, and a right polygonal film. Based on the rigid boundary conditions and a specific crease design, the left polygonal film is connected to the middle polygonal film, and the middle polygonal film is connected to the right polygonal film, respectively. All three film components are folded within the narrow rigid boundary, with the bottom edges of the films fixed to the narrow folding rigid boundary. After being folded laterally, the films are placed sideways into the folding space; when unfolded, by pulling the upper edge of the middle film, the films unfold sequentially from the outside in. This method has the advantages of high folding efficiency and adaptability to folding in confined spaces, improving the efficiency and practicality of optical light shields in limited spaces.

Description

Technical Field

[0001] This invention relates to the field of optical shield mechanism technology, and more specifically to an outward-tilting folded thin-film shield system suitable for confined spaces, particularly suitable for optical equipment applications in space-constrained environments. Background Technology

[0002] With the development of spacecraft and satellite technology, optical shielding systems are widely used in airborne and spaceborne optical payloads, especially in high-end optical equipment such as space telescopes. Optical shields can effectively block stray light from external sources such as solar radiation, terrestrial radiation, and reflections from ground objects while maintaining the imaging light within the field of view, significantly improving the target's signal-to-noise ratio. Therefore, the design of optical shields not only requires high-efficiency light-blocking performance but also miniaturization and lightweight design.

[0003] While current technology meets optical requirements, it faces the challenge of limited storage space, placing higher demands on the folding and unfolding methods of light shields. Existing folding methods often cannot achieve effective storage and rapid unfolding in confined spaces, limiting the flexibility of loading and use. Summary of the Invention

[0004] The objective of this invention is to provide a light-shielding film light shield system that offers excellent light-shielding performance in confined spaces, is easy to unfold, and has a high storage efficiency. This method aims to achieve sufficient tension on the surface of the light-shielding film, enabling it to be efficiently folded and quickly unfolded within a confined space, thereby meeting the performance requirements of modern optical systems for film light-shielding products.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A narrow rigid boundary, the boundary range is HIJKK′J′I′H′, the width of the rigid boundary is L, ∠HIJ=∠H′I′J′=∠IJK=∠I′J′K′, and the size of ∠HIJ can be set arbitrarily;

[0007] The vertical height of the cavity formed by the narrow rigid boundary is h;

[0008] The left side is a polygonal thin film ABCD, with the film boundary AB fixed on the left side HI of a narrow rigid boundary;

[0009] The central polygonal thin film B′E′H′C′ has its boundary B′E′ fixed on the narrow, rigid boundary IJ side.

[0010] The right-side polygonal thin film EFGH has its boundary EF fixed on the right side of the narrow rigid boundary JK.

[0011] During folding, the left polygonal film ABCD, the middle polygonal film BCHE, and the right polygonal film EHGF fold simultaneously.

[0012] After being fully folded, the folded film is placed within a narrow rigid boundary, and the ABEF of the film is fixed to the narrow rigid boundary HIJK.

[0013] To address the challenge of fully compressing and folding the film when not in use and fully unfolding it when in use, thereby improving storage efficiency and meeting the needs of storage in confined spaces, a design was developed for the left, middle, and right polygonal films. The creases of the middle polygonal film are parallel to its bottom edge, with a fixed crease height h. For the left and right polygonal film sections, the folding angle α was calculated based on the number of folds, the height after folding, and the folding boundaries. The left polygonal film was arranged mirror-image along CB following the creases of the middle polygonal film, and the right polygonal film was arranged mirror-image along EH following the creases of the middle polygonal film. After completing the crease arrangement for the single-vertex four-crease section, the remaining portion was folded using a multi-diagonal Z-shaped crease design according to the folding height. After the left, middle, and right films are folded, they can be stored within a narrow inner cavity. When unfolding, the upper edge of the middle polygonal film is pulled diagonally upwards, and the film unfolds sequentially from the outside in. To address the issue of sufficient light blocking and adapt to the working mode of the optical system, the film can extend obliquely outward after unfolding, providing sufficient light blocking without obstructing the operation of the optical system.

[0014] Compared with existing technologies, the advantages of this invention are:

[0015] When the entire thin-film system is folded up, it can be stored within a narrow U-shaped space with minimal width limitations, meeting the requirements for flexible arrangement of the light-shielding system and minimizing the required space. In the unfolded state, due to the two triangular film regions on the lower left and right sides of the film, the unfolding of these triangular regions along the narrow, rigid boundaries causes the upper light-shielding film to rotate, giving it a certain outward tilt angle. This outward tilt ensures effective light shading without obstructing the optical system's operation, thus better achieving the light-shielding function. During non-working periods, it features a high folding and storage efficiency, a small storage space, and the ability to be fully unfolded and tensioned during operation, while also providing ample light shading and easy folding and unfolding. Attached Figure Description

[0016] Figure 1 This is an overall schematic diagram of the unfolded state of the outward-tilting folding film light shield system suitable for confined spaces provided in an embodiment of the present invention;

[0017] Figure 2This is a schematic diagram of the narrow rigid boundary of the outward-tilting folding film light shield system suitable for confined spaces provided in the embodiments of the present invention;

[0018] Figure 3 This is a schematic diagram of the film folding process 1 of the outward-tilting folding film light shield system suitable for confined spaces provided in an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the film folding process 2 of the outward-tilting folding film light shield system suitable for confined spaces provided in an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the film folding process 3 of the outward-tilting folding film light shield system suitable for confined spaces provided in an embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the outward-tilting folding film light shield system for confined spaces provided in this embodiment of the invention after the film has been folded.

[0022] Figure 7 This is a three-dimensional schematic diagram of the narrow rigid boundary of the outward-tilting folding film light shield system suitable for confined spaces provided in the embodiments of the present invention;

[0023] Figure 8 This is a schematic diagram illustrating the relationship between the folded film and the narrow rigid boundary of the outward-tilting folding film light shield system suitable for confined spaces, provided in an embodiment of the present invention.

[0024] Figure 9 This is a schematic diagram showing the relationship between the film and the narrow rigid boundary when the outward-tilting folding film light shield system suitable for confined spaces is unfolded, as provided in an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1-Left polygonal film; 2-Middle polygonal film; 3-Right polygonal film; 4-Narrow rigid boundary. Detailed Implementation

[0027] To make the technical solution and advantages of this application clearer, a more clear and complete detailed description of the technical solution of this application will be provided in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings. Other related parts can be referred to with general design. In the absence of conflict, the embodiments and technical features in the embodiments of this application can be combined with each other to obtain new embodiments.

[0028] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms indicating orientation, such as “upper,” “lower,” “left,” “right,” “center,” “vertical,” “horizontal,” “inner,” and “outer,” used in this application description are used only to indicate relative directions or positional relationships, and do not imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, and therefore should not be construed as a limitation on this application. The terms “a,” “one,” or “the,” etc., used in this application description should not be construed as an absolute limitation on quantity, but rather as indicating the presence of at least one. The terms “including,” “comprising,” etc., used in this application description mean that the element or object preceding the term covers the element or object listed after the term and its equivalents, without excluding other elements or objects.

[0029] Furthermore, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and similar terms used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also be a connection within two components. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0030] The following is in conjunction with the appendix Figure 1 To be continued Figure 9 This application will be described in further detail.

[0031] This invention is a folding film light shield system for confined spaces with inward and outward tilting. By designing the folding method, a film system that can be stored in a confined space is obtained. When unfolded, it has an outward tilting shape. This system has the advantages of simple folding and unfolding, tight film tension, and sufficient light blocking.

[0032] A confined space inward and outward tilting folded film light shield system includes a folded film and a narrow rigid boundary 4. The folded film includes a left film 1, a middle film 2, and a right film 3 (e.g., ...). Figure 1 (Directions shown).

[0033] The narrow rigid boundary 4 includes an inner frame and an outer frame, and a receiving cavity located between the inner frame and the outer frame; the receiving cavity includes a back and side portions connected to both sides of the back; the back and the two side portions form a first included angle. The angle of the first included angle is adjusted according to design requirements.

[0034] Narrow rigid boundary 4, see Figure 2 and Figure 7The boundary range formed by the bottom of the inner frame (HIJK) and the bottom of the outer frame (H'I'J'K') is HIJKK′J′I′H′.

[0035] The included angle on the left side of the narrow rigid boundary is ∠HIJ = ∠H′I′J′; the included angle on the right side of the narrow rigid boundary is ∠KJI = ∠K′J′I′; the included angles on the left and right sides of the rigid boundary are the same, both being the first included angle. The width dimension KK′ = L in the narrow rigid boundary space, and the width dimension of the entire narrow space is the same as L; the dimension of the narrow rigid boundary 4 in the height direction is h.

[0036] The connecting line between the middle film 2, the left film 1, and the right film 3 is the first crease; the left film 1 and the right film 3 respectively include a first parallel crease area and an angular crease area, the middle film 2 is the second parallel crease area, the first parallel crease area consists of mutually parallel second creases, the second parallel crease area consists of mutually parallel third creases, and the angular crease area consists of multiple fourth creases intersecting at a point; the second crease and the third crease intersect on the first crease; when the folded film is flattened, the second crease and the third crease form the same second included angle α with the first crease, and the second included angle α is an acute angle;

[0037] Folded membrane, see Figure 1 The membrane consists of a left polygonal membrane 1, a middle polygonal membrane 2, and a right polygonal membrane 3. The left polygonal membrane 1 includes edges AB, AD, CD, and BC connected to the middle membrane. The middle polygonal membrane 2 includes edges B′C′, C′H′, and B′E′ connected to the left membrane, and edge H′E′ connected to the right membrane. Edge BC coincides with edge B′C′, and edge HE coincides with edge H′E′. The right polygonal membrane 3 includes edges EF, FG, GH, and HE connected to the middle membrane. The upper boundary DCHG of the entire membrane is a horizontal line. The lower boundary ABEF of the membrane forms two angles: ∠ABE=∠FEB, the angle ∠BCH=α formed by BC and CH, and the angle ∠EHC=α formed by EH and HC.

[0038] The bottom boundary of the left-side film is AB, and its length is less than or equal to the length of the rigid boundary HI.

[0039] The bottom boundary B′E′ of the middle film has a length equal to the length of the rigid boundary IJ;

[0040] The bottom boundary EF of the right-side film has a length less than or equal to the length of the rigid boundary JK.

[0041] The angle between the left-side film and the middle film is ∠ABE′;

[0042] The angle between the right-side film and the middle film is ∠FEB′;

[0043] The angle between the left-side film and the middle film is ∠CBE′;

[0044] The angle between the right-side film and the middle film is ∠HEB′;

[0045] BC is the angle bisector of ∠IBC, and EH is the angle bisector of ∠HEF;

[0046] The creases within the BCHE area are parallel to BE;

[0047] The crease within the MDCB area is parallel to IB;

[0048] The creases within the EHGM' range are parallel to EI';

[0049] The distance between creases and the height of the rigid boundary 4 are known, both being h. If the requirement of being equal to h is not met at the top layer of the creases, then the distance between creases is directly taken according to the remaining height of the film.

[0050] The left and middle films are connected by a single-vertex four-fold arrangement, and the right and middle films are connected by a single-vertex four-fold arrangement.

[0051] In both the left-side angular crease area AIB and the right-side angular crease area FEI', Z-shaped creases are arranged according to the angle bisector, and the edge distance is less than or equal to the distance h between the creases;

[0052] After the film is folded and gathered, it is placed within the narrow rigid boundary 4.

[0053] The left side is a polygonal thin film ABCD, with the film boundary AB fixed on the left side HI of a narrow rigid boundary;

[0054] The central polygonal thin film B′E′H′C′ has its boundary B′E′ fixed on the narrow, rigid boundary IJ side.

[0055] The right-side polygonal thin film EFGH has its boundary EF fixed on the left-side JK edge of a narrow rigid boundary.

[0056] During folding, the left polygonal film ABCD, the middle polygonal film BCHE, and the right polygonal film EHGF fold simultaneously.

[0057] After being fully folded, the folded film is placed within a narrow rigid boundary, and the ABEF of the film is fixed to the narrow rigid boundary HIJK.

[0058] The lower boundaries ABEF of the left, middle, and right films are fixed to the inner edge HIJK of a narrow, rigid boundary.

[0059] During unfolding, pull the film at points C and H and stretch it diagonally upwards.

[0060] The relationship between the folding height h and the number of folding layers is as follows:

[0061]

[0062]

[0063] N 左 =N1+N2

[0064] N 右 =N1+N3

[0065] Where, d CH,BE The distance between line CH and line BE; Let be the distance from point A to point M; is the distance from point F to point M'; h is the dimension in the height direction of the rigid boundary; The formula EvenCeil(N) represents rounding up to the nearest integer for any real number N; N1 represents the number of film folds in the central parallel crease region; N2 represents the number of film folds in the left corner crease region; N3 represents the number of film folds in the right corner crease region; N 左 N represents the number of film folds in the left crease region; 右 This indicates the number of film folds in the rightmost crease region.

[0066] At the first included angle of the known rigid boundary Given the width L and height h of the rigid boundary, the calculation process for the second included angle α of the thin film is as follows, with relevant illustrations attached. Figure 1 Appendix Figure 2 and attached Figure 3 As shown:

[0067] After the film is folded, A”OB” forms surface S, and E”OB” forms surface S’. Since the film is fixed at the bottom of the rigid boundary cavity, the angle ∠A”-OB”-E” formed by surfaces S and S’ is the first angle between the rigid boundary and the first angle between the two surfaces. They are equal, as shown in the following formula:

[0068]

[0069] The geometric relationship between the angle ∠B”-OE”-C” formed by OE”C” and surface S’ and surface S”, ∠B”-OE”-C”, the number of folded layers N1, and the width L of the rigid boundary is as follows:

[0070]

[0071] Combining the above formula, the second included angle α can be obtained by calculating and transforming using the spherical triangle formula. The relevant formula is as follows:

[0072] cos(∠B”-OE”-C”)=(cos∠C”OB”-cosα×cosβ) / (sinα×sinβ)

[0073]

[0074] Among them, β and α are complementary, and the position of β is shown in the attached figure. Figure 1 As shown in the figure, the positions of the remaining points are as follows: Figure 3 As shown.

[0075] The film has several folds, with peaks and valleys alternating.

[0076] The creases in the central film region enclosed by BCHE are parallel to the bottom edge BE; the creases in the left film region enclosed by ADCB are divided into two parts: the distance between the creases in the BMDC region is h, parallel to the BM edge; the redundant part ABM is divided by angle bisectors, which must be odd-numbered creases, and the distance between the ends of the creases is less than h; the creases in the right film region enclosed by EHGF are divided into two parts: the distance between the creases in M'EHG is h, parallel to the EM' edge; the redundant part EFM' is divided by angle bisectors. The structure is divided by bisectors, with an odd number of angle bisectors and a crease distance of less than h. The narrow rigid boundary 4 is composed of HI, IJ, JK, KK′, K′J′, J′I′, I′H′, and H′H, with a width of L. The resulting angles are ∠HIJ=∠H′I′J′=90° and ∠IJK=∠I′J′K′=90°. During folding, the entire membrane structure is folded together. Redundant parts are folded along Z-shaped creases, while the remaining parts are folded along single-vertex four-crease folds. The folding process is shown in the attached figure. Figure 3 -Appendix Figure 5 As shown, edge DCHG gradually converges towards edge ABEF, while regions CDAB and HGFE gradually fold towards the direction perpendicular to region CHEB; the shape of the film after folding is shown in the attached figure. Figure 6 As shown, AB is perpendicular to BE, FE is perpendicular to EB, and after the film is contracted, the distance between BC and EH is equal to the distance between the rigid boundaries II' and JJ'. A three-dimensional diagram of the narrow rigid boundaries is attached. Figure 7 As shown; the gathered film (as attached) Figure 6 (As shown) Placed within a narrow, rigid boundary (as attached) Figure 7 As shown in the diagram, the film boundary ABEF is fixed to the narrow, rigid boundary HIJK, completing the assembly of the entire light shield system. During unfolding, points C and H are pulled outwards and upwards, causing the film to unfold sequentially from the outside in, as shown in the attached diagram. Figure 9 As shown.

Claims

1. An outward-tilting folding film light shield system suitable for confined spaces, characterized in that, include: A narrow rigid boundary includes an inner frame and an outer frame, and a receiving cavity located between the inner frame and the outer frame; the receiving cavity includes a back and side portions connected to both sides of the back; the back and the two side portions form a first included angle; The folded film consists of a central polygonal film and symmetrically distributed side polygonal films on both sides of the central polygonal film. The connecting line between the central and side polygonal films is the first crease. The side polygonal films include a first parallel crease area and an angular crease area. The central polygonal film is the second parallel crease area. The first parallel crease area consists of mutually parallel second creases. The second parallel crease area consists of mutually parallel third creases. The angular crease area consists of multiple fourth creases intersecting at a point. The second and third creases intersect on the first crease. When the folded film is flattened, the second and third creases form the same second included angle with the first crease, and the second included angle is an acute angle. The first crease is formed by alternating peak lines and valley lines. The second and third creases are formed by alternating peak lines and valley lines. The folded membrane is placed inside the cavity of the narrow rigid boundary after being folded. The bottom edge of the central polygonal film of the folded membrane is fixed to the bottom of the back of the cavity, and the bottom edge of the side polygonal film of the folded membrane is fixed to the bottom of the side of the cavity. The folded membrane is unfolded by tensioning the top edge of the central polygonal film and the top edge of the side polygonal film of the folded membrane. The second angle formed by the second and third creases and the first crease satisfies the following relationship with the first angle of the narrow rigid boundary: in, The first included angle; The second included angle, and Complementary; The angle between the two folded surfaces in the first parallel crease area; It is the angle between the adjacent valley line and peak line on the first crease.

2. The outward-tilting folding film light shield system suitable for confined spaces according to claim 1, characterized in that, The relationship between the height of the rigid boundary and the number of folds in the folded membrane is as follows: in, This is the distance from the top edge to the bottom edge of the polygonal thin film in the middle. The length of the outer edge of the lateral angled crease area; This is the length of the outer edge of the other side's angled crease area; The dimension in the height direction of the rigid boundary; Represents any real number N Round up to the nearest integer; formula This means taking the even number upwards for any real number N. This indicates the number of film folds in the central parallel crease area; Indicates the number of film folds in the corner crease area; This indicates the number of film folds in the crease area on the other side. Indicates the number of film folds in the crease area on one side; This indicates the number of film folds in the crease area on the other side.

3. The outward-tilting folding film light shield system suitable for confined spaces according to claim 1 or 2, characterized in that, The bottom edge of the central polygonal film in the folded membrane is fixed to the inner frame at the bottom of the receiving cavity, and the bottom edge of the side polygonal film in the folded membrane is fixed to the inner frame at the bottom of the side receiving cavity.

4. The outward-tilting folding film light shield system suitable for confined spaces according to claim 1 or 2, characterized in that, The fourth crease in the angular crease area is arranged in a Z-shape according to the angle bisector.

5. The outward-tilting folding film light shield system suitable for confined spaces according to claim 1 or 2, characterized in that, The narrow rigid boundary is a U-shaped frame of equal width.

6. The outward-tilting folding film light shield system suitable for confined spaces according to claim 1 or 2, characterized in that, The first included angle between the back of the narrow rigid boundary and the two sides The range is 75°-120°.

7. The outward-tilting folding film light shield system suitable for confined spaces according to claim 1 or 2, characterized in that, The first included angle between the back of the narrow rigid boundary and the two sides It is 90°.

8. The outward-tilting folding film light shield system suitable for confined spaces according to claim 1 or 2, characterized in that, The same angle formed between the back of the narrow rigid boundary and the two sides becomes a different angle formed between the back of the narrow rigid boundary and the two sides.

9. The outward-tilting folding film light shield system for confined spaces according to claim 8, characterized in that, The angle between the central polygonal film and the two side polygonal films in the folded membrane varies depending on the angle between the back of the narrow rigid boundary and the two sides.

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