A double L-shaped boundary plane sunshade system with single-axis rotation constraint folding

Abstract

The present invention discloses a double L-shaped boundary plane sunshade system that is constrained to fold around a single axis of rotation. The folding plane sunshade system comprises a first L-shaped rigid boundary and a second L-shaped rigid boundary, a first light-shielding film and a second light-shielding film; the first L-shaped rigid boundary and the second L-shaped rigid boundary have the same L-shaped angle and are hinged at a common vertex A; the first light-shielding film has three edges fixed to the first L-shaped rigid boundary and the second L-shaped rigid boundary; the second light-shielding film has one edge fixed to the first L-shaped rigid boundary and one vertex hinged to the second L-shaped rigid boundary. The double L-shaped boundary plane sunshade system that is constrained to fold around a single axis of rotation drives the first light-shielding film to fold and unfold in half and the second light-shielding film to fold and unfold in a Z-shape by rotating the rigid boundary to achieve the folding and unfolding of the sunshade system. It has the advantages of simple folding and unfolding, high storage rate, tight film surface tension, and sufficient light shielding.

Description

Technical Field

[0001] The present invention relates to the technical field of optical light shield mechanisms, and in particular to a double-L-shaped boundary plane light shield system with single-axis rotation constraint folding. Background Art

[0002] Currently, optical sunshades are widely used in airborne and satellite-borne optical payloads, particularly in space telescopes. Optical sunshades minimize the entry of stray radiation outside the field of view, such as solar radiation, Earth radiation, and ground reflections, without blocking imaging light within the field of view. This maximizes the target's signal-to-noise ratio, making them both highly practical and important.

[0003] Current optical systems, on the one hand, require the sunshade system to have a high stray light suppression capability, and on the other hand, also put forward the demand for miniaturization and lightweight of the sunshade system. In addition, for different optical systems, the sunshade must also meet certain shape and proportion requirements. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a double L-shaped boundary plane sunshade system with sufficient light shielding, simple folding and unfolding, and fully tensioned light shielding film surface.

[0005] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0006] A double L-shaped boundary plane sunshade system capable of folding around a single axis of rotational constraint, comprising:

[0007] A first L-shaped rigid boundary includes a first rigid boundary AB and a second rigid boundary BD, wherein the first rigid boundary AB and the second rigid boundary BD form an angle ∠ABD;

[0008] The second L-shaped rigid boundary includes a third rigid boundary AC and a fourth rigid boundary CE, wherein the third rigid boundary AC and the fourth rigid boundary CE form an angle ∠ACE;

[0009] The first rigid boundary AB and the third rigid boundary AC are of equal length; the angle ∠ABD of the first L-shaped rigid boundary and the angle ∠ACE of the second rigid boundary are equal in magnitude; the first L-shaped rigid boundary and the second L-shaped rigid boundary are hingedly connected at a common vertex A;

[0010] The first light shielding film includes a first connecting edge A'B', a second connecting edge A'C', a third connecting edge B'F' and a free edge;

[0011] The first connecting edge A′B′ is fixed to the first rigid boundary AB, the second connecting edge A′C′ is fixed to the third rigid boundary AC, and the third connecting edge B′F′ is fixed to the second rigid boundary BD;

[0012] The second light-shielding film comprises a fourth connecting edge B′D′, a free edge and a folded edge;

[0013] The fourth connecting edge B′D′ is fixed on the second rigid boundary BD; the two ends of the folded edge of the second light shielding film are respectively connected to the node B of the second rigid boundary BD and the node E of the fourth rigid boundary CE;

[0014] When the second L-shaped rigid boundary rotates relative to the first L-shaped rigid boundary around the common vertex A, the third rigid boundary AC drives the folded edge of the first light shielding film to begin folding, and the fourth rigid boundary CE drives the folded edge of the second light shielding film to begin folding.

[0015] 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 miniaturization, the first and second light-shielding films are designed with creases. For a double-L-shaped boundary plane sunshade, the two L-shaped rigid boundaries should be able to completely overlap in the folded state. Therefore, the sunshade film of the sunshade is designed to be two pieces, with a folding crease arranged in the first light-shielding film and a Z-shaped crease arranged in the second light-shielding film to achieve full compression and storage in the folded state; the three connecting edges of the first light-shielding film are fixedly connected to the two L-shaped rigid boundaries, the connecting edge of the second light-shielding film is fixedly connected to the first L-shaped rigid boundary, and the connecting top angle is hinged to the end of the second L-shaped rigid boundary to ensure that the film is fully tensioned following the boundary in the unfolded state. When folded, the first and second L-shaped boundaries rotate around the hinge point A, the first light-shielding film folds in half following the L-shaped boundary, and the second light-shielding film folds in a Z-shape following the L-shaped boundary until the first and second L-shaped boundaries completely overlap. If necessary, if the storage ratio of the light-shielding film needs to be changed, other folds may be arranged on the first light-shielding film and the second light-shielding film.

[0016] In order to solve the problem of sufficient shading and enable the sunshade system to have a higher stray light suppression ability, the first sunshade film is designed to be a redundant flat shape. When the sunshade system is fully unfolded, a reinforced overlapping area is formed in the seam area of ​​the first sunshade film and the second sunshade film, further blocking stray radiation such as solar radiation, earth radiation, and reflection of ground objects outside the field of view from entering the optical system through the seam, thereby meeting the function of protection and reducing external stray light.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] When deployed, the double-L-shaped, flat, foldable sunshade system, with a single-axis rotational constraint, allows the first and second light-shielding films to be fully tensioned, creating a reinforced overlap at the seam. This provides sufficient light shielding within the area, protecting the optical system and reducing external stray light. The system can be folded away during off-peak hours and fully unfolded and tensioned during operation, offering the advantages of sufficient light shielding and simple folding and unfolding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an overall schematic diagram of the double L-shaped boundary plane sunshade system in the unfolded state provided by the first embodiment of the present invention;

[0020] Figure 2 1. This is a partial schematic diagram of the double L-shaped boundary plane sunshade system in the deployed state provided by the first embodiment of the present invention;

[0021] Figure 3 This is an overall schematic diagram of the double L-shaped boundary plane sunshade system provided by the first embodiment of the present invention in a folded state;

[0022] Figure 4 1 is a schematic diagram of a double L-shaped boundary plane sunshade system in a folded state provided by the first embodiment of the present invention;

[0023] Figure 5 This is an overall schematic diagram of the double L-shaped boundary plane sunshade system in the unfolded state provided by the second embodiment of the present invention;

[0024] Figure 6 1. A schematic diagram of a double L-shaped boundary plane sunshade system in an unfolded state provided by the second embodiment of the present invention;

[0025] Figure 7 This is an overall schematic diagram of the double L-shaped boundary plane sunshade system in a folded state provided by the second embodiment of the present invention;

[0026] Figure 8 1 is a partial schematic diagram of the double L-shaped boundary plane sunshade system in the folded state provided by the second embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1-first L-shaped rigid boundary; 2-second L-shaped rigid boundary; 3-first light-shielding film; 4-second light-shielding film. DETAILED DESCRIPTION

[0029] In order to make the technical solution and its advantages of the present application more clear, the technical solution of the present application will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only some embodiments of the present application and are only used to explain the present application, not 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. 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.

[0030] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application should be the ordinary meanings understood by ordinary 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 relative directions or positional relationships, 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, and therefore cannot be understood as a limitation on this application. The words "one", "an" or "the" and similar words used in the description of this application should not be understood as absolute limitations on quantity, but should be understood as the existence of at least one. The words "including" or "comprising" and similar words 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.

[0031] In addition, unless otherwise clearly specified and limited, the words "install", "connect", "connect" and similar terms 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 a connection between two components. Those skilled in the art can understand their specific meanings in this application based on the specific circumstances.

[0032] The following is combined with Figure 1 To the attached Figure 8 This application is described in further detail.

[0033] The present invention is a double L-shaped boundary plane sunshade system that is folded around a single axis and rotates to constrain folding. The folding and unfolding of the sunshade film is driven by the rotation of the L-shaped rigid boundary, and has the advantages of simple folding and unfolding, tight film surface, and sufficient light shielding.

[0034] Example 1

[0035] like Figure 1 and Figure 2As shown, a double-L-shaped boundary planar light shield system constrained to fold around a single axis of rotation includes a first L-shaped rigid boundary 1, a second L-shaped rigid boundary 2, a first light shielding film 3, and a second light shielding film 4. The first L-shaped rigid boundary 1 includes a rigid boundary AB and a rigid boundary BD, and boundary AB forms an angle ∠ABD with boundary BD; the second L-shaped rigid boundary 2 includes a rigid boundary AC and a rigid boundary CE, and boundary AC forms an angle ∠ACE with boundary CE, and ∠ABD and ∠ACE are equal and equal to β. The second L-shaped rigid boundary 2 is hingedly connected to the first L-shaped rigid boundary 1 at a common vertex A, and the two can rotate freely; the first light shielding film 3 includes three connecting edges A′B′, A′C′, and B′F′ and a free edge, and the connecting edges A′B′ and A′C′ form a vertex angle ∠A′=α, and α and β satisfy a certain restriction relationship. The three connecting edges A′B′, B′F′, and A′C′ are respectively connected to the AB and AD edges of the first L-shaped rigid boundary 1 and the second L-shaped rigid boundary 2. The AC edge is fixedly connected, the first light-shielding film 3 is folded in half, and a crease is distributed on the film, which is a valley line passing through the vertex A' of the film and bisecting ∠A'; the second light-shielding film 4 includes a connecting edge B'D', a connecting vertex angle ∠E', a free edge forming the connecting vertex angle ∠E', and a folded edge, the connecting edge B'D' is fixedly connected to the BD edge of the first L-shaped rigid boundary 1, the connecting vertex angle ∠E' is hingedly connected to one end E of the second L-shaped rigid boundary 2, and the two can rotate freely, the second light-shielding film 4 is folded in a Z shape, and a plurality of creases are distributed on the film, in which the peak lines and the valley lines are arranged alternately; in addition, the lengths of the connecting edge BD of the first L-shaped rigid boundary 1, the connecting edge CE of the second L-shaped rigid boundary 2, and the free edge DE of the second light-shielding film satisfy l CE +l DE =l BD .

[0036] like Figure 3 and Figure 4As shown, when the double L-shaped boundary plane sunshade system is folded, the first L-shaped rigid boundary 1 and the second L-shaped rigid boundary 2 rotate relative to each other around the common hinge vertex and finally completely overlap, and the first light-shielding film 3 is driven to fold in half along the valley line fold through the connecting edges A′B′, A′C′, and B′F′, and the second light-shielding film 4 is driven to fold in a Z shape along the alternating peak line and valley line fold through the connecting edge B′D′ and the connecting vertex angle ∠E′, so as to achieve full compression and storage in the folded state; the unfolding process of the double L-shaped boundary plane sunshade system is opposite to the folding process, and the first L-shaped The rigid boundary 1 and the second L-shaped rigid boundary 2 rotate relative to each other around the common hinge vertex and unfold to an angle α, and the first light-shielding film 3 is driven to unfold through the connecting edges A′B′, A′C′, and B′F′, and the second light-shielding film 4 is driven to unfold through the connecting edge B′D′ and the connecting vertex angle ∠E′, ensuring that the film is fully unfolded and tensioned following the boundary in the unfolded state, and the reinforced overlapping area formed by the seam area of ​​the first light-shielding film 3 and the second light-shielding film 4 further blocks stray radiation from entering the optical system through the seam, thereby meeting the functions of protection and reducing external stray light.

[0037] Example 2

[0038] Based on the first embodiment, a double L-shaped boundary plane light shield system with constrained folding around a single axis rotation is provided according to the present invention to change the crease distribution of the first light shielding film 3.

[0039] like Figures 5 to 8As shown, the second embodiment is similar to the first embodiment and meets the same constraints, but the sizes of the first L-shaped rigid boundary 1, the second L-shaped rigid boundary 2, the first light-shielding film 3 and the second light-shielding film 4 of the double L-shaped boundary plane sunshade system are changed. In addition, compared with the folding crease distribution of the first light-shielding film 3 in the first embodiment, the first light-shielding film 3 in the second embodiment adopts a Z-shaped crease distribution. When the double L-shaped boundary plane sunshade system is folded, the first L-shaped rigid boundary 1 and the second L-shaped rigid boundary 2 rotate relative to each other around the common hinge vertex and eventually completely overlap. The connecting edges A′B′, A′C′, and B′F′ drive the first light-shielding film 3 to fold in a Z shape along the alternating peak and valley creases. The connecting edges B′D′ and the connecting vertex angle ∠E′ drive the second light-shielding film 4 to fold in a Z shape along the alternating peak and valley creases, thereby achieving full compression and storage in the folded state. The unfolding process of the double L-shaped boundary plane sunshade system is opposite to the folding process. The first The L-shaped rigid boundary 1 and the second L-shaped rigid boundary 2 rotate relative to each other around the common hinge vertex and unfold to an angle α, driving the first light-shielding film 3 to unfold through the connecting edges A′B′, A′C′, and B′F′, and driving the second light-shielding film 4 to unfold through the connecting edge B′D′ and the connecting vertex angle ∠E′, ensuring that the film is fully unfolded and tensioned following the boundary in the unfolded state, and further blocking stray radiation light from entering the optical system through the seam through the reinforced overlapping area formed by the seam area of ​​the first light-shielding film 3 and the second light-shielding film 4, thereby meeting the functions of protection and reducing external stray light.

[0040] The advantage of the present invention is that when the double L-shaped boundary plane sunshade system with single-axis rotation constrained folding is unfolded, the first sunshade film and the second sunshade film can be fully tensioned and form a reinforced overlapping area at the joint, so that sufficient light is blocked in the area and it can be completely folded during non-working time, with a high storage rate and a simple folding and unfolding process.

[0041] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solutions of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the scope of protection of the technical solutions of the present invention.

Claims

1. A double L-shaped boundary plane sunshade system with foldable and constrained rotation around a single axis, characterized in that: include: A first L-shaped rigid boundary includes a first rigid boundary AB and a second rigid boundary BD, wherein the first rigid boundary AB and the second rigid boundary BD form an angle ∠ABD; The second L-shaped rigid boundary includes a third rigid boundary AC and a fourth rigid boundary CE, wherein the third rigid boundary AC and the fourth rigid boundary CE form an angle ∠ACE; The first rigid boundary AB and the third rigid boundary AC are of equal length; the angle ∠ABD of the first L-shaped rigid boundary and the angle ∠ACE of the second rigid boundary are equal in magnitude; the first L-shaped rigid boundary and the second L-shaped rigid boundary are hingedly connected at a common vertex A; The first light shielding film includes a first connecting edge A'B', a second connecting edge A'C', a third connecting edge B'F' and a free edge; The first connecting edge A′B′ is fixed to the first rigid boundary AB, the second connecting edge A′C′ is fixed to the third rigid boundary AC, and the third connecting edge B′F′ is fixed to the second rigid boundary BD; The second light-shielding film comprises a fourth connecting edge B′D′, a free edge and a folded edge; The fourth connecting edge B′D′ is fixed on the second rigid boundary BD; the two ends of the folded edge of the second light shielding film are respectively connected to the node B of the second rigid boundary BD and the node E of the fourth rigid boundary CE; When the second L-shaped rigid boundary rotates relative to the first L-shaped rigid boundary around the common vertex A, the third rigid boundary AC drives the free edge of the first light-shielding film to begin to fold so that the free edge is coplanar with the third connecting edge B′F′, and the fourth rigid boundary CE drives the folded edge of the second light-shielding film to begin to fold.

2. The double L-shaped boundary plane sunshade system with single-axis rotational constraint and folding according to claim 1, characterized in that: The vertex angle ∠A′ formed by the connecting edges A′B′ and A′C′ of the first light-shielding film is α, and α and β satisfy the following relationship: Where β is the angle ∠ABD of the first L-shaped rigid boundary.

3. The double L-shaped boundary plane sunshade system with single-axis rotational constraint and folding according to claim 1, characterized in that: The first light-shielding film is folded in half, and the film is provided with a crease which is a valley line passing through the vertex A′ of the film and bisecting ∠A′; The second light-shielding film is folded in a Z shape, and a plurality of folds are distributed on the film, wherein peak lines and valley lines are arranged alternately.

4. The double-L-shaped boundary plane sunshade system with single-axis rotational constraint and folding according to claim 1, characterized in that: The lengths of the connecting edge BD of the first L-shaped rigid boundary, the connecting edge CE of the second L-shaped rigid boundary, and the free edge DE of the second light-shielding film satisfy the following relationship: l CE +l DE ＝l BD 。 5. The double L-shaped boundary plane sunshade system with single-axis rotational constraint and folding according to claim 1, characterized in that: The free edge of the first light-shielding film is a folded edge, the first light-shielding film is folded in a Z shape at the folded edge, and the film is distributed with a plurality of folds, wherein the peak lines and the valley lines are arranged alternately; The second light-shielding film is folded in a Z shape, and a plurality of folds are distributed on the film, wherein peak lines and valley lines are arranged alternately.

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