Outward-inclined folding film light shield system suitable for narrow and small space

Abstract

The invention discloses a camber folding film light shield system suitable for a narrow space. The system is composed of a narrow rigid boundary, a left polygonal film, a middle polygonal film and a right polygonal film. According to rigid boundary conditions, through specific crease design, the left polygonal film and the middle polygonal film are connected, and the middle polygonal film and the right polygonal film are connected. The three parts of the film are all folded in a narrow rigid boundary, and the bottom edge of the film is fixed to the narrow folded rigid boundary. Transversely folding the thin film and then laterally putting the thin film into the folding space; when the film is unfolded, the upper edge of the middle film is pulled, and the film is unfolded from outside to inside in sequence. The method has the advantages of being high in folding storage rate and suitable for being folded in a narrow space, and the use efficiency and practicability of the optical light shield in a limited space can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of optical sunshade mechanisms, and in particular to an outward-inclined folding film sunshade system suitable for narrow spaces, and is particularly suitable for optical equipment applications in space-constrained environments. Background Art

[0002] With the development of spacecraft and satellite technology, optical sunshade systems have been widely used in airborne and satellite optical payloads, especially in high-end optical equipment such as space telescopes. Optical sunshades can effectively block external stray light such as solar radiation, earth radiation, and reflection from ground objects while maintaining the imaging light in the field of view, significantly improving the target signal-to-noise ratio. Therefore, the design of the optical sunshade not only needs to have efficient light-shielding performance, but also requires miniaturization and lightweight.

[0003] While meeting the optical requirements, current technologies face the problem of limited storage space, which places higher demands on the folding and unfolding methods of the sunshade. Existing folding methods often cannot achieve effective storage and rapid unfolding in a small space, limiting the flexibility of loading and use. Summary of the invention

[0004] The object of the present invention is to provide a light-shielding film sunshade system that has excellent light-shielding performance in a small space, is easy to unfold and has a high storage rate. The method aims to achieve sufficient tension on the surface of the light-shielding film so that it can be efficiently folded and quickly unfolded in a small space to meet the performance requirements of modern optical systems for film sunshade products.

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

[0006] 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′, 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 polygonal film ABCD on the left, the film boundary AB is fixed on the left side HI of the narrow rigid boundary;

[0009] The middle polygonal membrane B′E′H′C′, the membrane boundary B′E′ is fixed on the middle IJ edge of the narrow rigid boundary;

[0010] The right polygonal film EFGH, the film boundary EF is fixed on the right side JK of the narrow rigid boundary;

[0011] When folding, the left polygonal film ABCD, the middle polygonal film BCHE and the right polygonal film EHGF are folded simultaneously;

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

[0013] In order to solve the problem of fully compressing and folding in the non-working state and fully unfolding in the working state, thereby improving the storage rate and meeting the needs of storage in a narrow space, the left polygonal film, the middle polygonal film, and the right polygonal film are designed. The fold of the middle polygonal film is parallel to the bottom edge of the film, and the fold height is set to a fixed height h; the value of the folding angle α is calculated in the left and right polygonal film parts according to the number of folded layers, the height after folding, and the folding boundary. The left polygonal film is arranged according to the mirror image of the middle polygonal fold CB, and the right polygonal film is arranged according to the mirror image of the middle polygonal fold EH. After the fold arrangement of the single-vertex four-fold part is completed, the remaining part is set with a Z-shaped fold using multiple diagonal lines according to the folding height; after the left, middle and right films are folded, they can be stored in the narrow boundary cavity. When unfolding, pull the upper edge of the middle polygonal film diagonally upward, and the film unfolds from the outside to the inside. In order to solve the problem of sufficient shading and adapt to the working mode of the optical system, the film can extend obliquely outward after being unfolded, so as to fully shield the light without blocking the operation of the optical system.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] When the entire film system is folded, it can be folded into a small U-shaped space with very little width restriction, which meets the requirements of flexible layout of the shading system and minimizing the layout space. In the unfolded state, since there are two triangular film areas on the lower left and lower right sides of the film, the triangular film areas will drive the upper shading film to rotate when unfolded on the side of the narrow rigid boundary, so that the shading film has a certain outward inclination angle. The outward inclination of the film can effectively block the optical system from working without blocking it, and better realize the shading function. It has the characteristics of high folding and storage rate and small storage space during non-working time, and is fully unfolded and tensioned during work. It also has the advantages of sufficient shading and simple folding and unfolding. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an overall schematic diagram of a partially unfolded film state of an outward-tilted folding film sunshade system suitable for a narrow space provided by an embodiment of the present invention;

[0017] Figure 2It is a schematic diagram of the narrow rigid boundary of the outward-inclined folding film sunshade system suitable for a narrow space provided by an embodiment of the present invention;

[0018] Figure 3 1 is a schematic diagram of a film folding process 1 of an outward-folding film sunshade system suitable for a narrow space provided by an embodiment of the present invention;

[0019] Figure 4 is a schematic diagram of a film folding process 2 of an outward-folding film sunshade system suitable for a narrow space provided by an embodiment of the present invention;

[0020] Figure 5 is a schematic diagram of a film folding process 3 of an outward-folding film sunshade system suitable for a narrow space provided by an embodiment of the present invention;

[0021] Figure 6 It is a schematic diagram of the outward-folding film sunshade system suitable for a narrow space provided by an embodiment of the present invention after the film is folded;

[0022] Figure 7 It is a three-dimensional schematic diagram of a narrow rigid boundary of an outward-inclined folding film sunshade system suitable for a narrow space provided by an embodiment of the present invention;

[0023] Figure 8 It is a schematic diagram of the relationship between the film of the outward-folding film sunshade system suitable for a narrow space provided by an embodiment of the present invention and the narrow rigid boundary after the film is folded;

[0024] Fig. 9 It is a schematic diagram of the relationship between the film and the narrow rigid boundary when the outward-inclined folding film sunshade system suitable for a narrow space provided by an embodiment of the present invention is unfolded;

[0025] Description of reference numerals:

[0026] 1- polygonal membrane on the left; 2- polygonal membrane in the middle; 3- polygonal membrane on the right; 4- narrow rigid boundary. DETAILED DESCRIPTION

[0027] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be further described in detail in a clear and complete manner in conjunction with the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, rather than to limit the present application. It should be noted that, for the sake of ease of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0028] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application should be the usual meanings understood by the general technicians in the field to which this application belongs. The words "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inside", "outside" and other words indicating orientation used in the description of this application are only used to indicate the relative direction or positional relationship, and do not imply that the device or element must have a specific orientation, 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, so it cannot be understood as a limitation on this application. The similar words such as "one", "one" or "the" used in the description of this application should not be understood as an absolute limitation on the number, but should be understood as the existence of at least one. The similar words such as "including" or "comprising" used in the description of this application mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0029] In addition, unless otherwise clearly specified and limited, the words "installed", "connected", "connected" and similar words used in the description of this application should be understood in a broad sense. For example, the 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, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0030] The following is combined with Figure 1 To Attachment Fig. 9 This application is described in further detail.

[0031] The present invention is an inward-inward folding film sunshade system in a narrow space. By designing a folding method, a film system stored in a narrow space is obtained, which has an outward-inward shape when unfolded. The system has the advantages of simple folding and unfolding, tight film surface, sufficient light shielding, etc.

[0032] A folded film sunshade system for a narrow space, comprising a folded film and a narrow rigid boundary 4, wherein the folded film comprises a left film 1, a middle film 2 and a right film 3 (such as Figure 1 direction shown).

[0033] The narrow rigid boundary 4 comprises an inner frame, an outer frame and a receiving cavity between the inner frame and the outer frame; the receiving cavity comprises a back portion and side portions connected to both sides of the back portion; the back portion and the two side portions form a first angle The angle of the first 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 angle on the left side of the narrow rigid boundary is ∠HIJ=∠H′I′J′; the angle on the right side of the narrow rigid boundary is ∠KJI=∠K′J′I′; the angle on the left side of the rigid boundary is the same as the angle on the right side of the rigid boundary, both of which are the first angle The width dimension KK′ in the narrow rigid boundary space is L, 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 and 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 angle crease area, the middle film 2 is a second parallel crease area, the first parallel crease area is a second crease parallel to each other, the second parallel crease area is a third crease parallel to each other, and the angle crease area is a plurality of fourth creases intersecting at one 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 angle α with the first crease, and the second angle α is an acute angle;

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

[0038] The bottom boundary of the left membrane is AB, whose length is less than or equal to the length of the rigid boundary HI;

[0039] The bottom boundary B′E′ of the middle membrane is equal to the length of the rigid boundary IJ;

[0040] The length of the bottom boundary EF of the right membrane is less than or equal to the length of the rigid boundary JK.

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

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

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

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

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

[0046] The crease within the BCHE range is parallel to the BE;

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

[0048] The crease within the EHGM' range is parallel to the EI';

[0049] The distance between the folds and the height of the rigid boundary 4 are known, both are h. If the uppermost layer of the fold does not meet the requirement of being equal to h, the distance between the folds is directly taken according to the remaining height of the film;

[0050] The left film and the middle film are connected by a single vertex four fold arrangement, and the right film and the middle film are connected by a single vertex four fold arrangement;

[0051] In the left angle crease area AIB and the right angle crease area FEI', Z-shaped creases are arranged in the manner of angle bisectors, 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 a narrow rigid boundary 4 .

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

[0054] The middle polygonal film B′E′H′C′, the film boundary B′E′ is fixed on the middle IJ edge of the narrow rigid boundary;

[0055] The right polygonal film EFGH, the film boundary EF is fixed on the left side JK of the narrow rigid boundary;

[0056] When folding, the left polygonal film ABCD, the middle polygonal film BCHE and the right polygonal film EHGF are folded 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 membranes are fixed to the inner edge HIJK of the narrow rigid boundary;

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

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

[0061]

[0062]

[0063] N 左 =N1+N2

[0064] N 右 =N1+N3

[0065] Among them, d CH,BE is the distance between straight line CH and straight line BE; is the distance from point A to point M; is the distance from point F to point M'; h is the dimension of the rigid boundary in the height direction; EvenCeil(N) represents the integer rounded upward for any real number N; the formula EvenCeil(N) represents the even number rounded upward for any real number N, N1 represents the number of film folding layers in the middle parallel crease area; N2 represents the number of film folding layers in the left corner crease area; N3 represents the number of film folding layers in the right corner crease area; N 左 Indicates the number of film folds in the left fold area; N 右 Indicates the number of film folds in the right crease area.

[0066] The first angle at a known rigid boundary When the width L of the rigid boundary and the height h of the rigid boundary are considered, the calculation process of the second angle α of the film is as follows. Figure 1 , Attachment 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 formed by surface S and surface S’ is ∠A”-OB”-E” and the first angle of the rigid boundary. are equal, as shown below:

[0068]

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

[0070]

[0071] Combined with the above formula, the second angle α is calculated and converted through 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 is complementary to α, and the β position is as follows Figure 1 The positions of the remaining points are shown in Figure 3 shown.

[0075] The film is distributed with a number of folds, in which the peaks and valleys are arranged alternately.

[0076] The fold in the middle film area surrounded by BCHE is parallel to the bottom edge BE; the fold in the boundary of the left film area surrounded by ADCB is divided into two parts, the distance between the folds in the BMDC area is h, parallel to the BM edge, and the redundant part ABM is divided by the angle bisector, which must be an odd-numbered fold, and the distance between the fold ends is less than h; the fold in the boundary of the right film area surrounded by EHGF is divided into two parts, the distance between the folds in M'EHG is h, parallel to the EM' edge, and the redundant part EFM' is divided by the angle bisector. The bisectors of the angles must be odd numbers, and the distance between the ends of the folds is less than h. The narrow rigid boundaries 4 are composed of HI, IJ, JK, KK′, K′J′, J′I′, I′H′ and H′H. The width of the narrow rigid boundaries is L, and the angles formed are ∠HIJ=∠H′I′J′=90°, ∠IJK=∠I′J′K′=90°. When folding, the entire film structure is folded together, the redundant part is folded according to the Z-shaped fold, and the rest is folded according to the single vertex four folds. The folding process is as shown in the attached figure. Figure 3 -Attached Figure 5 As shown in the figure, the edge DCHG gradually converges to the edge ABEF, and at the same time, the CDAB region and the HGFE region gradually fold in the direction perpendicular to the CHEB region; the shape of the film after folding into place is shown in the figure. Figure 6 As shown, AB is perpendicular to BE, FE is perpendicular to EB, and after the film is folded, the distance between BC and EH is equal to the distance between rigid boundaries II' and JJ'. The three-dimensional diagram of the narrow rigid boundary is shown in the attached figure. Figure 7 As shown; the gathered film (as shown in the attached Figure 6 ) into a narrow rigid boundary (as shown in the attached Figure 7 As shown in the figure, the boundary ABEF of the film is fixed to the narrow rigid boundary HIJK, and the entire sunshade system is assembled. When unfolding, pull the points C and H outward and upward, and the film unfolds from the outside to the inside in sequence, as shown in the figure. Fig. 9 shown.

Claims

1. An outward-folding film sunshade system suitable for narrow spaces, characterized in that: include: A narrow rigid boundary, comprising an inner frame and an outer frame and a receiving cavity between the inner frame and the outer frame; the receiving cavity comprises a back portion and side portions connected to both sides of the back portion; the back portion and the two side portions form a first angle; A folding film is composed of a central polygonal film and side polygonal films symmetrically distributed on both sides of the central polygonal film, the connecting line between the central polygonal film and the side polygonal film is a first fold; the side polygonal film includes a first parallel fold area and an angle fold area, the central polygonal film is a second parallel fold area, the first parallel fold area is a second fold parallel to each other, the second parallel fold area is a third fold parallel to each other, and the angle fold area is a plurality of fourth folds intersecting at one point; the second fold and the third fold intersect on the first fold; when the folding film is flattened, the second fold and the third fold form the same second angle with the first fold, and the second angle is an acute angle; the first fold is formed by alternately connecting the peak line and the valley line; the second fold and the third fold are alternately arranged by the peak line and the valley line; After being folded, the folding membrane is placed in the accommodating cavity with the narrow rigid boundary, the bottom edge of the middle polygonal film of the folding membrane is fixed to the bottom of the back of the accommodating cavity, and the bottom edge of the side polygonal film of the folding membrane is fixed to the bottom of the side of the accommodating cavity; the unfolding of the folding membrane is achieved by tensioning the top edge of the middle polygonal film of the folding membrane and the top edge of the side polygonal film of the folding membrane.

2. The outward-folding film sunshade system suitable for narrow spaces according to claim 1, characterized in that: The second angle formed by the second crease and the third crease with the first crease and the first angle of the narrow rigid boundary satisfy: cos(∠B”-OE”-C”)=(cos∠C”OB”-cosα×cosβ) / (sinα×sinβ) in, is the first angle; α is the second angle, β is complementary to α; ∠B”-OE”-C” is the angle between the two folding surfaces in the first parallel crease area; ∠C”OB”- is the angle between the adjacent valley lines and peak lines on the first crease.

3. The outward-folding film sunshade system suitable for narrow spaces according to claim 2, characterized in that: The relationship between the height of the rigid boundary and the number of folded layers of the folded membrane is: N 左 =N1+N2 N 右 =N1+N3 Among them, d CH,BE is the distance from the top edge to the bottom edge of the middle polygonal film; It is the length of the outer edge of the corner crease area on one side; is the length of the outer edge of the other side angle crease area; h is the dimension of the rigid boundary in the height direction; EvenCeil(N) represents the rounding of any real number N upwards to an integer; the formula EvenCeil(N) represents the rounding of any real number N upwards to an even integer, N1 represents the number of film folding layers in the middle parallel crease area; N2 represents the number of film folding layers in the one side corner crease area; N3 represents the number of film folding layers in the other side corner crease area; N 左 Indicates the number of film folds in the crease area on one side; N 右 Indicates the number of film folds in the crease area on the other side.

4. The outward-folding film sunshade system suitable for narrow spaces according to any one of claims 1 to 3, characterized in that: The bottom edge of the middle polygonal film in the folded film is fixed on the inner frame at the bottom of the accommodating cavity, and the bottom edge of the side polygonal film in the folded film is fixed on the inner frame at the bottom of the side accommodating cavity.

5. The outward-folding film sunshade system suitable for narrow spaces according to any one of claims 1 to 3, characterized in that: The fourth folds in the angle fold area are all arranged in a Z-shaped fold in the manner of angle bisectors.

6. The outward-folding film sunshade system suitable for narrow spaces according to any one of claims 1 to 3, characterized in that: The narrow rigid boundary is a U-shaped frame of equal width.

7. The outward-folding film sunshade system suitable for narrow spaces according to any one of claims 1 to 3, characterized in that: The first angle between the narrow rigid boundary back and the two side portions It is 75°-120°.

8. The outward-folding film sunshade system suitable for narrow spaces according to any one of claims 1 to 3, characterized in that: The first angle between the narrow rigid boundary back and the two side portions is 90°.

9. The outward-folding film sunshade system suitable for narrow spaces according to any one of claims 1 to 3, characterized in that: The same angle formed by the narrow rigid boundary back and the two side parts becomes different angles formed by the narrow rigid boundary back and the two side parts.

10. The outward-folding film sunshade system suitable for narrow spaces according to claim 9, characterized in that: The angle between the middle polygonal film and the two side polygonal films in the folded film is different depending on the angle between the narrow rigid boundary back and the two side portions.

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