JP7433646B2 - Deployment structure - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Law On October 21, 2020, a summary of research on deployable structures was published on the website of the 70th International Astronautical Congress. On October 25, 2020, at the 70th International Astronautical Congress, we published our research on deployable structures. In December 2020, we published a summary of our research on deployable structures on the website of the 35th Space Structures and Materials Symposium. On December 2, 2020, we published our research on deployable structures at the 35th Space Structures and Materials Symposium.

The present invention relates to a deployable structure.

Patent Document 1 discloses a deployable structure including a first panel, a second panel, a panel locking structure, and biasing means. The first panel and the second panel are foldably connected to each other by a hinge structure. A biasing force is applied to the second panel by a biasing means in a direction in which the second panel is expanded relative to the first panel. The panel locking structure holds the second panel in a folded state with respect to the first panel by locking the second panel. In this deployable structure, when the second panel is released from being locked by the panel locking structure, the second panel is deployed with respect to the first panel around the hinge structure and transitions to the deployed state. When the first panel and the second panel are in the unfolded state, the latch structure functions to prevent them from transitioning to the folded state.

Japanese Patent Application Publication No. 2015-85885

In this deployable structure, when the first panel and the second panel transition to the deployed state, the second panel rotates around the hinge structure. A biasing force is applied to the second panel by a biasing member. Therefore, when the locking by the panel locking structure is released, the second panel rotates around the hinge structure. It is conceivable that the latch structure functions as the latch structure transitions to the unfolded state while increasing its rotational momentum. In this case, when the latch structure functions, the rotation of the second panel suddenly stops, and the recoil caused by the sudden stop may act on the deployable structure, so the posture of the deployable structure becomes stable. There is a possibility that it will not.

The present invention has been made in view of the above-mentioned conventional situation, and an object to be solved is to provide a deployable structure that can be deployed satisfactorily while maintaining a stable posture.

The deployable structure of the present invention has a sheet shape, and when heated or irradiated with electromagnetic waves, the cross-sectional shape in one predetermined direction deforms or contracts into a convex shape, and the cross-sectional shape perpendicular to the predetermined one direction is deformed. Alternatively, it comprises a plurality of shape memory members that do not shrink, and a connecting member that connects the edges of the shape memory members arranged so as not to overlap each other, and each of the shape memory members is heated or irradiated with electromagnetic waves. At the front, they are folded so that they overlap each other.

This deployable structure is folded so that a plurality of shape memory members connected by connecting members overlap each other before being heated or irradiated with electromagnetic waves. This deployable structure deforms or contracts into a convex shape in each shape memory member by being heated or irradiated with electromagnetic waves. At this time, a force is applied to the connecting member at the portion where the shape memory members deform to separate from each other so as to be pulled by each shape memory member. On the other hand, the above-mentioned force is not applied to the connecting members at the portions where the shape memory members are deformed so as to approach each other. In this deployable structure, each shape memory member can deploy based on the above-described force applied to the connecting member. For this reason, each shape memory member tends to unfold slowly, and when the deployable structure is deployed in space, it is difficult to affect the attitude of the deployable structure.

FIG. 2 is a plan view of the deployable structure of Example 1 in a deployed state. 2 is a sectional view taken along line AA in FIG. 1. FIG. FIG. 3 is a perspective view showing a state in which the first member and the second member of Example 1 are made into a planar shape and a state in which they are made into a generally semicylindrical shape. FIG. 2 is a plan view of the deployable structure of Example 1 in a deployed state, showing the axes of the first member and the second member. FIG. 2 is a plan view of the unfolded structure of Example 1 in an unfolded state, in which dotted lines indicate mountain-fold positions and dashed-dotted lines indicate valley-fold positions. FIG. 2 is a perspective view showing the unfolded structure of Example 1 in a folded state. FIG. 7 is a plan view of the deployable structure of Example 2 in a deployed state. 8 is a sectional view taken along line BB in FIG. 7. FIG. FIG. 7 is a plan view of the deployable structure of Example 2 in a deployed state, showing the axes of the first member, the third member, and the fourth member. FIG. 3 is a plan view of the unfolded structure of Example 2 in the unfolded state, where dotted lines indicate mountain-fold positions and dashed-dotted lines indicate valley-fold positions. FIG. 7 is a perspective view showing the unfolded structure of Example 2 in a folded state.

A preferred embodiment of the present invention will be described.

Each shape memory member of the deployable structure of the present invention may be connected with the outer surface of the side that protrudes when deformed or contracted by being heated or irradiated with electromagnetic waves facing the same direction. According to this configuration, it becomes easier to apply a pulling force to the connecting member when deforming or contracting, so that it is easier to expand better.

The connecting member of the deployable structure of the present invention connects at least one of the inner surfaces that are recessed when each shape memory member is heated or irradiated with electromagnetic waves and deformed or contracted, and the outer surfaces that are protruded. Good too. According to this configuration, each shape memory member can be easily connected.

The deployable structure of the present invention may include a laminated member provided so as to cover the outer surface of the side that protrudes when each shape memory member is deformed or contracted by being heated or irradiated with electromagnetic waves. According to this configuration, the degree of deformation or contraction of each shape memory member can be adjusted by the laminated member.

The thickness of the connecting member and the laminated member of the deployable structure of the present invention may be thinner than the thickness of the shape memory member. According to this configuration, deformation or contraction of the shape memory member can be made difficult to prevent.

The connecting member and the laminated member of the deployable structure of the present invention may be made of different materials. According to this configuration, materials having necessary characteristics can be used for each of the connecting member and the laminated member.

The shape memory member of the deployable structure of the present invention has a first member having a square shape and a second member having an outer shape obtained by dividing the first member along one diagonal line, and is heated or irradiated with electromagnetic waves. A first array part in which a plurality of first members are arranged in series, the edges of which are connected to each other, which deform or contract into a convex shape when heated, and a diagonal line which deforms or contracts into a convex shape when heated or irradiated with electromagnetic waves. The second arrangement part connects the corresponding edges to each other, and the second arrangement part and the first member connect the edges that deform or contract into a convex shape when heated or irradiated with electromagnetic waves. You may do so. According to this configuration, the plurality of first arrangement parts can be connected to each other so as to extend in two directions by the second arrangement part, so that it is easy to make the outer shape of the deployable structure various.

Next, Examples 1 and 2 embodying the deployable structure of the present invention will be described with reference to the drawings.

<Example 1>
As shown in FIGS. 1 and 2, the deployable structure 1 of Example 1 includes a first member 11 that is a plurality of shape memory members 10, a second member 12 that is a plurality of shape memory members 10, a connecting member 13, and A laminated member 14 is provided. For the first member 11 and the second member 12, SMP (Shape Memory Polymer), which is a sheet-like synthetic resin, is used. The thickness of the first member 11 and the second member 12 is approximately 0.4 mm. The first member 11 has a square outer shape. The outer shape of the second member 12 is a right-angled isosceles triangle. Specifically, the second member 12 has an outer shape that is obtained by dividing the first member 11 into two along one diagonal line. Note that in FIGS. 1, 4, and 5, the outer shape of the second member 12 is smaller than the outer shape of the first member 11 divided into two by one diagonal line, but this is because it is drawn for ease of reference. be.

The first member 11 and the second member 12 become elastic when heated by an external heat source to a temperature higher than a predetermined temperature (glass transition temperature Tg), and become elastic when heated lower than a predetermined temperature. It has the property of changing into a hard state. The glass transition temperature Tg of the first member 11 and the second member 12 is, for example, 55°C. The first member 11 and the second member 12 are heated to a temperature higher than a predetermined temperature, stretched into a planar shape, and maintained at a temperature lower than a predetermined temperature. Thereby, the first member 11 and the second member 12 can memorize (maintain) a state in which they are stretched in a planar shape (see FIGS. 3(A), (C), and (E)).

When the first member 11 and the second member 12, which have been memorized (maintained) in a flat stretched state, are heated again to a higher temperature than a predetermined temperature, the cross-sectional shape in one predetermined direction deforms or contracts into a convex shape. When the temperature is lowered below a predetermined temperature, it maintains the roughly semi-cylindrical shape and changes to a hard state with no elasticity (Figures 3 (B) and (D)). , see (F).) That is, the shape memory member 10 has a sheet shape, and when heated, the cross-sectional shape in one predetermined direction deforms or contracts into a convex shape. Furthermore, the shape memory member 10 does not deform or shrink in its cross-sectional shape perpendicular to one predetermined direction.

The deployable structure 1 is a sheet-like structure in which 16 first members 11 in which the state of being stretched in a flat shape is stored and 16 second members 12 in which a state of being stretched in a flat shape is stored are arranged on the same plane. is doing. The expanded structure 1 has a square outer shape. The dimension of one side of the deployable structure 1 is approximately five times the dimension of one side of the first member 11. Note that in FIGS. 1, 4, and 5, the dimension of one side of the deployed structure 1 is more than five times the dimension of one side of the first member 11, but this is because it is drawn for ease of reference. The first member 11 and the second member 12, which are shape memory members, are heated to a higher temperature than a predetermined temperature so that the outer surfaces of the protruding sides that are deformed or contracted are oriented in the same direction. That is, the shape memory member 10 has its outer surface protruding in the same direction when it is heated and deformed or contracted. In the center of the deployable structure 1, the first member 11 and the second member 12 are not arranged, and a hole H having approximately the same external shape as the first member 11 is formed. For example, the main body of an artificial satellite may be placed in the hole H (not shown).

As shown in FIG. 4, the deployable structure 1 has four first arrangement parts 11A and eight second arrangement parts 12A. The first array part 11A includes three first members 11 connected in series and connected by a connecting member 13, each of which has connected edges that deform or contract into a convex shape when the temperature is higher than a predetermined temperature. (See Figures 1 and 2.) In the first arrangement section 11A, the first members 11 are arranged in a line. In each of the first arrangement parts 11A, the first member 11 located at one end is arranged at each corner E of the deployable structure 1, and one member is arranged along each side S of the deployable structure 1. There is. In the first array portion 11A, the axis A1 of the first member 11 when deformed into a substantially semi-cylindrical shape is along each side S. The first array portion 11A has its longitudinal direction oriented along the side S. The longitudinal direction of the first arrangement portion 11A is the direction in which the first members 11 are lined up in a row.

The second arrangement section 12A has two second members 12. In the second arrangement portion 12A, edges of the second member 12 corresponding to the diagonal lines of the first member 11 that is deformed or contracted into a convex shape are connected by a connecting member 13 (see FIGS. 1 and 2). The outer shape of the second arrangement portion 12A is a square having approximately the same size as the first member 11. In the four sides forming the outer shape of the second arrangement part 12A, the edges that deform or contract into a convex shape are located on two adjacent sides forming right angles. Among the four sides forming the outer shape of the second arrangement portion 12A, the edges that do not deform or contract into a convex shape are located on two adjacent sides forming right angles. When the two second members 12 constituting the second arrangement section 12A are deformed into a generally semi-cylindrical shape, their axes A2 are at right angles.

One second array portion 12A is arranged on each side S (see FIG. 4). One edge of the second arrangement section 12A disposed on the side S that deforms or contracts into a convex shape, and a first member located at the other end of the first arrangement section 11A whose longitudinal direction is disposed along the side S. 11 edges that deform or contract into a convex shape are connected to each other. In the second array portion 12A disposed on the side S, the axis A2 of the second member 12 that constitutes the side S is along the side S that it constitutes. The second arrangement portion 12A disposed on the side S and the first member 11 disposed along the side S in the longitudinal direction connect edges that deform or contract into a convex shape when heated. There is.

The remaining four second arrangement parts 12A are arranged around the hole H of the deployable structure 1. The axis A2 of the second member 12 disposed on the four sides of the hole H is perpendicular to the side of the hole H on which it is disposed.

One first member 11 is provided between the second array portion 12A disposed on the side S and the second array portion 12A disposed on one of the two sides of the hole H that is perpendicular to the side S. is located. One edge of the first member 11 sandwiched between the two second array parts 12A that deforms or contracts into a convex shape has the other edge of the second array part 12A disposed on the side S that deforms or contracts into a convex shape. edges are connected. Further, the other edge of the first member 11 that deforms or contracts into a convex shape is connected to one edge of the second arrangement section 12A disposed in the hole H that deforms or contracts into a convex shape. . In other words, the second arrangement portion 12A and the first member 11 connect edges that deform or contract into a convex shape when heated. The axis A1 of the first member 11 is parallel to the axis A2 of the second member 12 of the second array section 12A connected to each of the edges that deform or contract into a convex shape.

The connecting member 13 is a tape having a thickness of approximately 25 μm and a width of approximately 10 mm, and is made of polyurethane. The connecting member 13 is attached so as to connect the adjacent edges of the first member 11 and the second member 12 arranged as described above. For example, the connecting member 13 is attached to the inner surfaces of the first member 11 and the second member 12 that are concave when deformed or contracted (see FIG. 2). The connecting member 13 connects the edges of the shape memory members arranged so as not to overlap with each other.

The laminated member 14 is made of polyimide (for example, Kapton (registered trademark) manufactured by DuPont-Toray Co., Ltd.) and has a thickness of approximately 35 μm. The laminated member 14 is attached to each of the first member 11 and the second member 12 so as to cover the outer surfaces of the first member 11 and the second member 12 that protrude when deformed or contracted (Fig. 2 reference.). The thickness of the connecting member 13 and the laminated member 14 is thinner than the thickness of the shape memory member 10. The connecting member 13 and the laminated member 14 are made of different materials.

The deployable structure 1 thus configured is folded into the form shown in FIG. 6 by mountain-folding at the dotted line shown in FIG. 5 and valley-folding at the dashed-dotted line. That is, each shape memory member 10 is folded so as to overlap each other before being heated. A state in which the deployable structure 1 is folded is a non-deployed state.

When the unfolded structure 1 folded in this manner is heated to a temperature higher than a predetermined temperature, the first member 11 and the second member 12 change from a planar state to an approximately semi-cylindrical state (see FIG. 3). (See A) to (F).) A laminated member 14 is attached to the first member 11 and the second member 12. Although the deformation of the first member 11 and the second member 12 is not hindered by the laminated member 14, the degree of change in shape is suppressed compared to the case where the laminated member 14 is not attached. In the deployable structure 1, as the first member 11 and the second member 12 deform, a pulling force is applied to the connecting member 13 by the first member 11 and the second member 12. The deployable structure 1 gradually deploys based on this force, and finally changes to a deployed state in which the outer shape is approximately square (see FIGS. 1, 4, and 5).

According to the first embodiment configured as described above, the following effects are achieved.

The deployable structure 1 has a sheet shape, and when heated, the cross-sectional shape in one predetermined direction deforms or contracts into a convex shape, and the cross-sectional shape perpendicular to the predetermined one direction does not deform or contract. It includes a member 10 and a connecting member 13 that connects the edges of the shape memory members 10 arranged so as not to overlap each other, and the shape memory members 10 are folded so as to overlap each other before being heated. .

According to this configuration, the deployable structure 1 is folded so that the plurality of shape memory members 10 connected by the connecting members 13 overlap each other before being heated. When this deployable structure 1 is heated, the shape memory member 10 deforms or contracts into a convex shape. At this time, a force is applied to the connecting members 13 at the portions where the shape memory members 10 deform so as to separate from each other so as to be pulled by the shape memory members 10 . On the other hand, the above force is not applied to the connecting members 13 at the portions where the shape memory members 10 are deformed so as to approach each other. In the deployable structure 1, each shape memory member 10 can be deployed by the above-described force applied to the connecting member 13. For this reason, each shape memory member 10 tends to unfold slowly, and when the deployable structure 1 is deployed in space, the attitude of the deployable structure 1 is hardly affected.

The shape memory members 10 of the deployable structure 1 are connected so that the outer surfaces of the sides that protrude when heated and deformed or contracted are oriented in the same direction. According to this configuration, it becomes easier to apply a pulling force to the connecting member 13 when deforming or contracting, so that it is easier to expand better.

The connecting member 13 of the deployable structure 1 connects the inner surfaces of the sides that are recessed when the shape memory member 10 is heated and deformed or contracted. According to this configuration, the shape memory members 10 can be easily connected.

The deployable structure 1 includes a laminated member 14 provided to cover the outer surface of the side that protrudes when the shape memory member 10 is heated and deformed or contracted. According to this configuration, the degree of deformation or contraction of the shape memory member 10 can be adjusted by the laminated member 14.

The thickness of the connecting member 13 and the laminated member 14 of the deployable structure 1 is thinner than the thickness of the shape memory member 10. According to this configuration, deformation or contraction of the shape memory member 10 can be made difficult to prevent.

The connecting member 13 and the laminated member 14 of the deployable structure 1 are made of different materials. According to this configuration, materials having necessary characteristics can be used for each of the connecting member 13 and the laminated member 14.

The shape memory member 10 of the deployable structure 1 includes a first member 11 having a square shape and a second member 12 having an outer shape obtained by dividing the first member 11 along one diagonal line. The deployable structure 1 constitutes a first arrangement section 11A and a second arrangement section 12A. In the first arrangement section 11A, a plurality of first members 11 are arranged in series, each of which has connected edges that deform or contract into a convex shape when heated. The second array portion 12A connects edges corresponding to diagonal lines that deform or contract into a convex shape when heated. The second arrangement portion 12A and the first member 11 connect edges that deform or contract into a convex shape when heated. According to this configuration, the plurality of first arrangement parts 11A can be connected to each other so as to extend in two directions by the second arrangement part 12A, so that the outer shape of the deployable structure 1 can be easily made into various shapes.

<Example 2>
As shown in FIG. 7, the deployable structure 2 of Example 2 has a right isosceles triangular outer shape in the deployed state, and a first structure that maintains a planar state without deforming or contracting even when heated. This embodiment differs from Example 1 in that the non-shape memory member 15, the second non-shape memory member 16, and the third non-shape memory member 17 are connected. The other configurations are the same as in Example 1, and the same configurations are denoted by the same reference numerals and detailed explanations will be omitted.

The outer shape of the deployable structure 2 of Example 2 is a right isosceles triangle. As shown in FIG. 9, the deployable structure 2 has three first arrangement parts 11A. The two first arrangement portions 11A are arranged along the side S2 that is not perpendicular to the other sides. A square-shaped first non-shape memory member 15 is arranged between these first array parts 11A. The first non-shape memory member 15 has a property of maintaining a planar state without deforming or contracting even when heated.

One end of the remaining first arrangement part 11A is connected to the first non-shape memory member 15 arranged between the two first arrangement parts 11A, and the sides S3 of the same length in the deployable structure 2 touch each other. It is arranged so as to extend toward the corner E2. The longitudinal direction of this first arrangement section 11A is orthogonal to the two first arrangement sections 11A.

In each of the first arrangement parts 11A, a third member 20A, which is the shape memory member 20, and a fourth member 20B, which is the shape memory member 20, are connected to the ends on the sides apart from each other. Sheet-like SMP is used for the third member 20A and the fourth member 20B. In the deployable structure 2, one third member 20A is arranged at each end of the side S2. The third member 20A has a trapezoidal shape. The side of each third member 20A on the side away from the first array section 11A is formed along each side S3. The edge portion of the third member 20A that deforms or contracts into a convex shape is connected to the far end of each first arrangement portion 11A by a connecting member 13. The axis A3 of the third member 20A is parallel to the axis A1 of the first member 11 of the first arrangement section 11A.

The fourth member 20B is arranged at the corner E2 where the sides S3 touch each other. The fourth member 20B has a pentagonal shape. The shape of the fourth member 20B on the side away from the first arrangement section 11A is formed along each of the sides S3. The edge portion of the fourth member 20B that deforms or contracts into a convex shape is connected to the end of the first arrangement portion 11A on the side closer to the corner E2 by the connecting member 13. The axis A4 of the fourth member 20B is parallel to the axis A1 of the first member 11 of the first arrangement section 11A. The first member 11, the third member 20A, and the fourth member 20B have outer surfaces that deform or contract and protrude when the temperature is higher than a predetermined temperature, and are oriented in the same direction.

The deployable structure 2 further includes a second non-shape memory member 16 and a third non-shape memory member 17. The second non-shape memory member 16 and the third non-shape memory member 17 are made of the same material as the first non-shape memory member 15. The second non-shape memory member 16 is formed by cutting out a part of the first non-shape memory member 15 to form a pentagonal shape. The third non-shape memory member 17 has a right isosceles triangular shape. The second non-shape memory members 16 and the third non-shape memory members 17 are arranged alternately along the side S3. The first non-shape memory member 15 is arranged in a region surrounded by the first array portion 11A and the third non-shape memory member 17.

The first member 11, the third member 20A, the fourth member 20B, the first non-shape memory member 15, the second non-shape memory member 16, and the third non-shape memory member 17 arranged in this way are connected. Adjacent edges are connected by the member 13 (see FIGS. 7 and 8). Specifically, the connecting member 13 includes an inner surface of the first member 11, the third member 20A, and the fourth member 20B that is concave when deformed or contracted, and a first non-shape memory member located on this surface side. 15, the second non-shape memory member 16, and the third non-shape memory member 17 are pasted so as to connect their surfaces to each other (see FIGS. 7 and 8).

The laminated member 14 covers the outer surfaces of the first member 11, the third member 20A, and the fourth member 20B that protrude when deformed or contracted. It is attached to each member 20B (see FIG. 8). Note that the laminated member 14 may be attached to the first non-shape memory member 15, the second non-shape memory member 16, and the third non-shape memory member 17, or may not be attached.

The deployable structure 2 thus configured can be folded into the form shown in FIG. 11 by mountain-folding at the dotted line position shown in FIG. 10 and valley-folding at the dashed-dotted line position. A state in which the deployable structure 2 is folded is a non-deployed state.

When the unfolded structure 2 folded in this manner is heated to a higher temperature than a predetermined temperature, the first member 11, the third member 20A, and the fourth member 20B change from a planar state to an approximately semi-cylindrical state. do. The laminated member 14 is attached to the first member 11, the third member 20A, and the fourth member 20B. Although the deformation of the first member 11, the third member 20A, and the fourth member 20B is not prevented by the laminated member 14, the degree of change in shape is suppressed compared to the case where the laminated member 14 is not attached. It will be done. The deployable structure 2 is attached to the connecting member 13 so as to be pulled by the first member 11, the third member 20A, and the fourth member 20B as the first member 11, the third member 20A, and the fourth member 20B deform. power is given. The deployable structure 2 gradually deploys based on this force, and finally changes to a deployed state in which the outer shape is approximately a right isosceles triangle (see FIGS. 7, 9, and 10).

The present invention is not limited to the first and second embodiments explained by the above description and drawings, but the following embodiments are also included within the technical scope of the present invention.
(1) In Examples 1 and 2, the plurality of first array portions are arranged with different longitudinal directions. However, the present invention is not limited to this, and a configuration may be adopted in which the longitudinal directions of the plurality of first arrangement parts are aligned in one direction and connected in series. In this case, the first arrangement portion may be folded into a bellows shape with a crease formed between adjacent first members.
(2) In Examples 1 and 2, the shape memory member is heated from the outside, but the shape memory member can be heated by irradiating electromagnetic waves to the shape memory member kneaded with metal powder. That is, the shape memory member may be made of a material that deforms or contracts when irradiated with electromagnetic waves.
(3) In Example 1, the laminated member is formed of polyimide with a thickness of approximately 35 μm, but the thickness of the laminated member may be thinner than 35 μm or thicker than 35 μm. Further, the laminated member does not need to be made of polyimide and may be formed of other materials.
(4) In Example 1, the thickness of the shape memory member is approximately 0.4 mm, but the thickness of the shape memory member may be thinner than 0.4 mm or thicker than 0.4 mm. Furthermore, it is not necessary to use synthetic resin as the material for the shape memory member, and other materials such as metal may be used for the shape memory member. Further, these materials may be used in combination.
(5) In Example 1, the connecting member is made of polyurethane and has a thickness of about 25 μm, but the connecting member may have a thickness of less than 25 μm or thicker than 25 μm. Furthermore, the connecting member may be formed of any other material instead of polyurethane, as long as it is made of a material that has elastic properties.
(6) Example 1 illustrates a configuration in which the first member and the second member are connected by a connecting member, and Example 2 illustrates a configuration in which the first member, the third member, and the fourth member are connected by the connecting member. Although illustrated, a structure in which the first member, the second member, and the connecting member are integrally formed, or a structure in which the first member, the third member, the fourth member, and the connecting member are integrally formed may be used. Specifically, it is conceivable to mold the portion corresponding to the connecting member to be thinner than the thickness of the first member, the second member, the third member, and the fourth member.
(7) In Example 1, adjacent sides of the first member and second member are connected to each other by a connecting member, and in Example 2, adjacent sides of the first member, third member, and fourth member are connected to each other by a connecting member. Although they are connected by a connecting member, the first member and the second member may be attached to one connecting member side by side so that they do not overlap, or the first member, third member, and fourth member may be attached to one connecting member. It may also be configured such that they are pasted side by side so that they do not overlap.
(8) In Examples 1 and 2, a configuration in which a sheet-like laminated member is pasted is illustrated, but the present invention is not limited to this, and the first member, second member, third member, and fourth member correspond to the laminated member. The laminated members may be laminated by applying and curing the material.
(9) In Examples 1 and 2, the first members are connected such that the axes in the first arrangement part are connected, but the invention is not limited to this, and the axes of adjacent first members in the first arrangement part are at right angles. They may be connected as follows.
(10) In Example 1, the first member and the second member are connected so that the outer surfaces of the protruding sides are in the same direction, and in Example 2, the first member and the second member are connected so that the outer surfaces of the protruding sides are in the same direction. Although the first member, the third member, and the fourth member are connected, the first member and the second member may be connected such that the outer surfaces of the protruding sides are not in the same direction, or the first member, The third member and the fourth member may be connected.
(11) In Example 1, the connecting member is attached to the inner surfaces of the first member and the second member that are concave when deformed or contracted, and in Example 2, the first member, the third member, and In the fourth member, the connecting member is attached to the inner surfaces of the sides that are recessed when deformed or contracted; however, the connection member is not limited to this, and in the first and second members, the sides that protrude when deformed or contracted or may be attached to the outer surfaces of the first, third, and fourth members that protrude when deformed or contracted. In addition, the first member and the second member may be pasted on both the inner surfaces that are recessed when deformed or contracted, and the outer surfaces that protrude when deformed or contracted, or the first member and the third In the member and the fourth member, it may be affixed to both the inner surfaces that are recessed when deformed or contracted, and the outer surfaces that protrude when deformed or contracted.

DESCRIPTION OF SYMBOLS 1, 2... Deployment structure 10, 20... Shape memory member 11... First member 11A... First array part 12... Second member 12A... Second array part 13... Connection member 14... Laminated member

Claims (6)

A plurality of shape memory members that are in a sheet form and whose cross-sectional shape in one predetermined direction deforms or contracts into a convex shape when heated or irradiated with electromagnetic waves, and whose cross-sectional shape perpendicular to the predetermined one direction does not deform or contract. and,
a connecting member that connects the edges of the shape memory members that are arranged so as not to overlap each other;
Equipped with
Each of the shape memory members is folded so as to overlap each other before being heated or irradiated with electromagnetic waves,
The shape memory member is
a first member having a square shape;
and a second member having an outer shape obtained by dividing the first member by one diagonal line,
a first array portion in which a plurality of first members are arranged in series, each of which has connected edges that deform or contract into a convex shape when heated or irradiated with electromagnetic waves;
a second arrangement portion that connects edges corresponding to the diagonal lines that deform or contract into a convex shape when heated or irradiated with electromagnetic waves;
constitutes,
The second array portion and the first member are deployable structures that connect edges that deform or contract into a convex shape when heated or irradiated with electromagnetic waves . 2. The deployable structure according to claim 1, wherein each of the shape memory members is connected with the outer surface of the side that protrudes in the same direction when deformed or contracted by heating or irradiation with electromagnetic waves. From claim 1, wherein the connecting member connects at least one of inner surfaces that are recessed when each of the shape memory members is heated or irradiated with electromagnetic waves and deformed or contracted, and outer surfaces that protrude. Deployable structure according to any one of claims 2 to 3. Any one of claims 1 to 3, further comprising a laminated member provided so as to cover the outer surface of the side that protrudes when each of the shape memory members is deformed or contracted by being heated or irradiated with electromagnetic waves. Deployment structure described. The deployable structure according to claim 4, wherein the thickness of the connecting member and the laminated member is thinner than the thickness of the shape memory member. The deployable structure according to any one of claims 4 and 5, wherein the connecting member and the laminated member are made of different materials.

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