JP2023032686A - Three-dimensional structure body - Google Patents

Abstract

To provide a three-dimensional structure body having an appropriate physical property according to an application.SOLUTION: There is provided a three-dimensional structure body, in which a plurality of unit structures each having a space of n-prismatic shape (n is an integer of 3 or greater) as one unit is arranged, and at least one of the plurality of unit structures includes: a center point of the space; and p pieces of structural pillars (p is an integer satisfying 2≤p≤(2n-1)) connecting p pieces of vertices in 2n pieces of vertices forming the n-prismatic shape.SELECTED DRAWING: Figure 5A

Description

Embodiments of the present invention relate to three-dimensional structures.

BACKGROUND ART Conventionally, objects (three-dimensional structures) have various mechanical physical properties (hereinafter also simply referred to as "physical properties") such as durability, hardness, resilience, impact absorption, and fit. Objects are required to have various physical properties depending on their uses, such as medical products and construction materials. Therefore, when manufacturing an object for a specific use, for example, materials with various physical properties are combined according to the use.

For example, in the medical field, when a person's physical function is reduced or lost due to illness or injury, it is a device worn on the body of a subject (patient) to compensate for that function or protect the affected area. is used. An example of medical equipment is an insole (medical insole) that is laid between the sole of a subject's foot and the insole of a shoe. Insoles are manufactured for each individual patient by combining materials with various physical properties depending on the location and symptoms of the affected area. In addition, braces are used not only for medical purposes but also for assisting and protecting bodily functions in sports and daily life.

JP 2017-012751 A

However, with the conventional techniques, it was sometimes difficult to achieve physical properties suitable for the intended use. For example, when the external shape is specified according to the application, such as medical products and construction materials, it is necessary to realize desired physical properties without changing the external shape. In addition, when the choice of materials is limited depending on the manufacturing method, such as a three-dimensional printer (3D-Printer), it is necessary to realize the desired physical properties in the limited materials. As described above, when there are restrictions on the external shape and materials, it is sometimes difficult to achieve physical properties suitable for the intended use.

An object of the present invention is to provide a three-dimensional structure having physical properties appropriate for its use.

In order to solve the above-described problems and achieve the object, the present invention provides a plurality of unit structures having n (n is an integer of 3 or more) prismatic space as one unit, and among the plurality of unit structures, At least one is p vertices connecting the center of the space and p (p is an integer satisfying 2≦p≦(2n−1)) out of 2n vertices forming the n-prism shape. It is a three-dimensional structure having structural columns of

FIG. 1 is a diagram showing an example of the structure of an insole according to an embodiment. FIG. 2 is a diagram for explaining the unit structure of the embodiment. FIG. 3 is a diagram for explaining the unit structure of the embodiment. FIG. 4 is a diagram for explaining the asymmetry of the unit structure in the load direction according to the embodiment. FIG. 5A is a diagram for explaining the asymmetry of the unit structure in the load direction according to the embodiment; FIG. 5B is a diagram for explaining the asymmetry of the unit structure in the load direction according to the embodiment; FIG. 5C is a diagram for explaining the asymmetry of the unit structure in the load direction according to the embodiment; FIG. 5D is a diagram for explaining the asymmetry of the unit structure in the load direction according to the embodiment; FIG. 5E is a diagram for explaining the asymmetry of the unit structure in the load direction according to the embodiment; FIG. 6 is a diagram for explaining the relationship between the asymmetry of the unit structure in the load direction and physical properties according to the embodiment.

Hereinafter, embodiments of a three-dimensional structure according to the present invention will be described in detail with reference to the accompanying drawings.

(embodiment)
In this embodiment, a medical insole will be described as an example of a three-dimensional structure. However, the embodiments are not limited to insoles, and can be widely applied to braces that are applied to various parts of the human body, such as hands, elbows, knees, shoulders, and head. Moreover, the embodiments are not limited to medical equipment, but are widely applicable to equipment used for assisting or protecting physical functions in sports or daily life, for example. The insole is also called an insole, an insole, or the like. In addition, the embodiments are not limited to braces, and three-dimensional structures (objects) with various shapes can be manufactured, such as construction materials, depending on the application.

FIG. 1 is a diagram showing an example of the structure of the insole 10 of the embodiment. The left diagram of FIG. 1 illustrates a plan view of the insole 10 for the right foot viewed from the contact surface side that comes into direct or indirect contact with each part of the human body. The right figure of FIG. 1 illustrates the side view of the left figure. The upper side of FIG. 1 shows the toe side of the insole 10, and the lower side of FIG. 1 shows the heel side of the insole 10. As shown in FIG.

As shown in FIG. 1, the insole 10 of the embodiment has a region R1, a region R2, and a region R3. Region R1 is a region that forms the overall contour of insole 10 . A region R2 is a region in contact with a portion near the calcaneus. A region R3 is a region in contact with a site near the metatarsal joint of the thumb.

Region R1, region R2, and region R3 according to the embodiment are configured by different unit structures. That is, it is preferable that the insole 10 has at least two regions composed of unit structures different from each other.

Note that the content shown in FIG. 1 is merely an example, and the embodiment is not limited to this. For example, the number, position, size, shape, and thickness of each region constituting the insole 10 can be arbitrarily changed according to the purpose of use and symptoms of the wearer. Also, the insole 10 may be manufactured with uniform physical properties as a whole without having individual regions.

The unit structure will be described with reference to FIGS. 2 and 3. FIG. 2 and 3 are diagrams for explaining the unit structure of the embodiment.

FIG. 2 exemplifies a spatial shape in which the unit structure is one unit. As shown in FIG. 2, one unit of the unit structure is a cubic space (unit space) composed of six square faces. The unit structure has eight points P1 to P8 corresponding to vertices.

Here, a method of notating lines and planes in the unit structure will be described. In this embodiment, when describing a line and a plane, vertices forming the line or plane are shown in parentheses. For example, the notation "line (P1, P2)" represents a line connecting point P1 and point P2. Also, the notation "line (P1, P7)" represents a line (diagonal line) connecting the point P1 and the point P7. Also, the notation "surface (P1, P2, P3, P4)" represents a surface (bottom surface) having points P1, P2, P3, and P4 as vertices.

A unit structure according to the embodiment includes a plurality of structural columns that connect two of the plurality of points P1 to P8. That is, the spatial shape of FIG. 2 corresponds to the shape of the unit structure. The number and direction (arrangement direction) of the structural pillars are defined in advance by, for example, the unit cell model. A unit structure defined by a unit cell model is also referred to as a unit cell structure.

FIG. 3 illustrates a unit cell model showing the basic skeleton shape of the unit structure. In FIG. 3, the dashed line indicates a cubic space (the space in FIG. 2) corresponding to one unit. Solid lines also indicate the presence of structural columns. The unit cell model illustrated in FIG. 3 is preferably arranged in each region of the insole 10 so that the arrangement direction thereof coincides with the load direction applied to the brace in the vertically downward direction in FIG. The load direction applied to the brace is the direction in which the load received from each part of the human body is applied.

For example, the unit cell models include model A, model B, model C, model D, model E, and model F, as shown in FIG. Here, model A, model B, and model C have the intersection of the structural columns at the center of the cuboidal space. Moreover, model D and model E each have an intersection of structural columns at the center of at least one of a plurality of surfaces forming a cubic shape.

Model A is a unit cell model with four structural columns arranged along diagonals of a cubic shape. Specifically, model A has structural columns on line (P1, P7), line (P2, P8), line (P3, P5), and line (P4, P6), respectively.

Model B is a unit cell model with structural columns on eight lines arranged along multiple sides surrounding the bottom and top surfaces of the cube, in addition to the four lines of model A. be. Specifically, model B has structural columns on the four lines that model A has. Furthermore, model B has four lines surrounding the bottom surface (P1, P2, P3, P4): lines (P1, P2), lines (P2, P3), lines (P3, P4), and lines (P4, P1). , each has a structural column. In addition, model B has four lines (P5, P6) surrounding the top surface (P5, P6, P7, P8), lines (P6, P7), lines (P7, P8), and lines (P8, P5). , each has a structural column.

Model C is a unit cell model with 12 lines similar to Model B, plus additional structural columns on 4 lines arranged along the load direction. Specifically, model C has structural columns on the 12 lines that model B has. Furthermore, model C is plotted on four lines (P1, P5), lines (P2, P6), lines (P3, P7), and lines (P4, P8) arranged along the direction of load applied to the insole. , each with a structural column.

That is, the difference between model B and model C is the four lines (P1, P5), (P2, P6), (P3, P7), and (P4, P8) arranged along the load direction. ), whether or not it has a structural column.

Model D is a unit cell model with structural columns on 12 lines placed along the diagonal of each of the 6 faces. Specifically, model D has structural posts on two lines (P1, P3) and lines (P2, P4) corresponding to the diagonals of the bottom surface (P1, P2, P3, P4), respectively. Model D also has structural columns on two lines (P5, P7) and lines (P6, P8) corresponding to the diagonals of the top surface (P5, P6, P7, P8), respectively. Model D also has two lines (P1, P6) and lines (P2, P5) corresponding to the diagonals of the sides (P1, P2, P5, P6). Model D also has structural columns on two lines (P2, P7) and lines (P3, P6) corresponding to diagonals of sides (P2, P3, P6, P7), respectively. Model D also has structural columns on two lines (P3, P8) and lines (P4, P7) corresponding to diagonals of sides (P3, P4, P7, P8), respectively. Model D also has structural columns on two lines (P1, P8) and lines (P4, P5) corresponding to diagonals of sides (P1, P4, P5, P8), respectively.

Model E is a unit cell model that does not have structural columns on the diagonals of the bottom and top surfaces compared to model D, and has additional structural columns on eight lines corresponding to multiple sides surrounding the bottom and top surfaces. Specifically, model E has structural columns on two lines (P1, P6) and lines (P2, P5) corresponding to the diagonals of sides (P1, P2, P5, P6), respectively. Model E also has structural columns on the two lines (P2, P7) and lines (P3, P6) corresponding to the diagonals of the sides (P2, P3, P6, P7), respectively. Model E also has structural columns on the two lines (P3, P8) and (P4, P7) corresponding to the diagonals of the sides (P3, P4, P7, P8), respectively. Model E also has structural columns on two lines (P1, P8) and lines (P4, P5) corresponding to diagonals of sides (P1, P4, P5, P8), respectively. In addition, model E has four lines (P1, P2) surrounding the bottom surface (P1, P2, P3, P4), lines (P2, P3), lines (P3, P4), and lines (P4, P1). , each has a structural column. In addition, model E has four lines (P5, P6) surrounding the top surface (P5, P6, P7, P8), lines (P6, P7), lines (P7, P8), and lines (P8, P5). , each has a structural column.

That is, the difference between model D and model E is the presence or absence of linear structural columns arranged on the bottom and top surfaces. Specifically, it has structural pillars on four lines (P1, P3), lines (P2, P4), lines (P5, P7), and lines (P6, P8) along the diagonals of the bottom and top surfaces. is model D. Also, eight lines surrounding the bottom and top surfaces (P1, P2), lines (P2, P3), lines (P3, P4), lines (P4, P1), lines (P5, P6), lines (P6, P7) ), lines (P7, P8), and structural columns on lines (P8, P5) is Model E.

In FIG. 3, the structural columns of model D and model E are illustrated by solid lines of two different thicknesses, but this does not indicate the actual thickness of the structural columns, but is intended to clarify the illustration. is. In other words, the thicker solid line indicates the structural pillar included in the "surface seen on the front side of the box" when the cubic space is likened to a box. In addition, the thin solid line indicates a structural column that is included only in the "surface visible on the back side of the box" when the cubic space is likened to a box. It should be noted that the "surfaces visible on the front side of the box" are the top surface (P5, P6, P7, P8), the side surfaces (P1, P2, P5, P6), and the side surfaces (P1, P4, P5, P8). Also, the "faces visible on the back side of the box" are the bottom (P1, P2, P3, P4), the side (P2, P3, P6, P7), and the side (P3, P4, P7, P8).

The model F is a unit cell model having structural pillars on 12 lines corresponding to each side of the spatial shape of which the unit structure shown in FIG. 2 is one unit. Specifically, the model F has four lines (P1, P2), lines (P2, P3), lines (P3, P4), and lines (P4, P4) surrounding the bottom surface (P1, P2, P3, P4). P1) each has a structural column on it. In addition, model F has four lines (P5, P6) surrounding the top surface (P5, P6, P7, P8), lines (P6, P7), lines (P7, P8), and lines (P8, P5). , each has a structural column. In addition, the model F is plotted on four lines (P1, P5), lines (P2, P6), lines (P3, P7), and lines (P4, P8) arranged along the direction of load applied to the insole. , each with a structural column.

Thus, the region R1, the region R2, and the region R3 are configured by different unit structures. That is, each region of the insole 10 has a structure in which a plurality of unit structures are repeatedly and continuously arranged. Specifically, each region of the insole 10 has at least one layer in which a plurality of unit structures are arranged on the same plane, and this layer is laminated. The cross-sectional shape of the structural column can be any shape such as a polygon such as a quadrangle, a pentagon, or a hexagon, a circle, an ellipse, or the like.

Note that the contents shown in FIGS. 2 and 3 are merely examples, and the contents shown in the drawings are not restrictive. For example, the cubic space shown in FIG. 2 is merely an example, and the spatial shape of each unit structure may be a polygonal prism shape. In this case, for the unit structure, it is preferable that a space having any one shape of, for example, a triangular prism shape, a square prism shape, and a hexagonal prism shape is used as one unit. As the triangular prism shape, an equilateral triangular prism shape is suitable. Moreover, as the quadrangular prism shape, a rectangular parallelepiped shape is preferable in addition to the above-described cubic shape. Moreover, as the hexagonal prism shape, a regular hexagonal prism shape is suitable. Also, the structural column has a columnar shape such as a polygonal columnar shape or a cylindrical columnar shape. Further, the lateral direction of the structural column is a direction orthogonal to the axial direction of the structural column.

Further, it is preferable that the unit structures forming each of the regions R1 to R3 have a constant spatial shape. For example, the unit structures forming the region R1 have a uniform triangular prism shape, the unit structures forming the region R2 have a uniform square prism shape, and the unit structures forming the region R3 have a uniform hexagonal prism shape.

In addition, the unit structure forming each of the regions R1 to R3 may have a partially missing (cut off) structure at the boundary. Here, the boundary portion corresponds to the contour surface of the insole 10, the boundary surface between the regions R1 and R2, the boundary surface between the regions R1 and R3, and the like. Since such a boundary portion does not necessarily coincide with the outer surface of the unit structure, the unit structure is partially cut to match the shape of the boundary portion. In addition, the unit structure (or the excised unit structure) may be exposed, or the boundary may be covered with a film or the like having an arbitrary thickness.

The model shown in FIG. 3 is merely an example, and the unit cell model may have structural columns at arbitrary positions. However, it is preferable that the unit structure has a plurality of structural columns such that one of the structural columns passes through all the vertices forming the polygonal columnar space.

Here, the insole 10 according to the present embodiment has appropriate physical properties according to the application by introducing the asymmetry of the unit structure in the load direction by the deletion of the structural pillars. That is, in the insole 10, a plurality of unit structures each having a unit of n (n is an integer equal to or greater than 3) prismatic space are arranged. In addition, in the insole 10, at least one of the plurality of unit structures is positioned between the center of the space and p (p is an integer satisfying 2≤p≤(2n-1)) among the 2n vertices forming the n-prism shape. ) vertices and p structural pillars. It should be noted that the n-prism shape is preferably a quadrangular prism shape or a hexagonal prism shape.

4, 5A, 5B, 5C, 5D, and 5E, the asymmetry of the unit structure in the load direction according to the embodiment will be described. 4 to 5E are diagrams for explaining the asymmetry of the unit structure in the load direction according to the embodiment. 4 to 5E, description will be given by exemplifying the case where the deletion of the structural pillar is introduced into the unit structure of the model A in FIG. 4 to 5E, points P1 to P8 correspond to points P1 to P8 shown in FIG. 2, respectively. A point P9 corresponds to the center point (the intersection of the model A) of the space in which the unit structure is one unit. 4 to 5E, the Y-axis corresponds to the opposite direction of the load direction, the X-axis is orthogonal to the Y-axis, and the Z-axis is orthogonal to the X-axis and the Y-axis. That is, in the insole 10, the unit structures are arranged so that a load is applied to the upper surface of the n-prism-shaped space.

FIG. 4 illustrates each structural pillar that can be deleted in the unit structure of model A (symmetrical unit structure) without deletion. In FIG. 4, structural pillar L1 is a structural pillar arranged on a line connecting point P1 and point P9. The structural column L2 is a structural column arranged on a line connecting the points P2 and P9. The structural column L3 is a structural column arranged on a line connecting the points P3 and P9. The structural column L4 is a structural column arranged on a line connecting the points P4 and P9. The structural column L5 is a structural column arranged on a line connecting the points P5 and P9. The structural column L6 is a structural column arranged on a line connecting the points P6 and P9. Structural pillar L7 is a structural pillar arranged on a line connecting point P7 and point P9. The structural pillar L8 is a structural pillar arranged on a line connecting the points P8 and P9.

FIG. 5A illustrates the asymmetry due to the deletion of one structural pillar. The unit structure “D1” illustrated in FIG. 5A is a structure lacking the structural column L1. That is, the unit structure "D1" is a structure having a structural column L2, a structural column L3, a structural column L4, a structural column L5, a structural column L6, a structural column L7, and a structural column L8.

Figures 5B-5D illustrate the asymmetry due to the deletion of two structural pillars. The unit structure “D2A” illustrated in FIG. 5B is a structure lacking the structural pillar L1 and the structural pillar L7. That is, the unit structure "D2A" is a structure having structural column L2, structural column L3, structural column L4, structural column L5, structural column L6, and structural column L8. A unit structure “D2B” illustrated in FIG. 5C is a structure in which structural pillars L1 and structural pillars L2 are deleted. That is, the unit structure "D2B" is a structure having structural column L3, structural column L4, structural column L5, structural column L6, structural column L7, and structural column L8. The unit structure “D2C” illustrated in FIG. 5C is a structure lacking the structural pillar L1 and the structural pillar L3. That is, the unit structure "D2C" is a structure having structural column L2, structural column L4, structural column L5, structural column L6, structural column L7, and structural column L8.

FIG. 5E illustrates the asymmetry due to the deletion of four structural pillars. A unit structure “D4” illustrated in FIG. 5E is a structure lacking the structural column L1, the structural column L3, the structural column L6, and the structural column L8. That is, the unit structure "D4" is a structure having the structural column L2, the structural column L4, the structural column L5, and the structural column L7.

Even if one of the structural pillars is deleted from the unit structure, if each unit structure is arranged three-dimensionally, there will be a structural pillar of one of the unit structures at each vertex. Therefore, a structure remains at each vertex. Therefore, as shown in FIG. 5A, for example, even if the structural pillar L1 is deleted, the spherical structure remains at the point P1. 5B, points P1 and P2 in FIG. 5C, points P1 and P3 in FIG. 5D, points P1, P3, P6, and P8 in FIG. 5E. The same is true for structures.

Thus, the unit structure of model A shown in FIGS. 5A to 5E has an asymmetric structure in which at least one of the eight structural columns L1 to L8 is deleted. By arranging a plurality of such asymmetric unit structures in the X-axis, Y-axis, and Z-axis directions, the insole 10 having appropriate physical properties according to the application can be formed.

Note that the contents shown in FIGS. 4 to 5E are merely examples, and the embodiment is not limited to these. For example, the number of structural pillars to be deleted can be arbitrarily deleted as long as it is half or less of the total number of structural pillars in a unit structure without deletion. In other words, in the unit structure of the model A, it is possible to delete four or fewer of the eight structural columns L1 to L8. In other words, the unit structure preferably has (n/2) or more structural pillars.

Moreover, the position of the structural pillar to be deleted can be set arbitrarily. For example, when deleting one structural pillar, it is possible to delete any one of the eight structural pillars L1 to L8.

Further, although FIGS. 4 to 5E show the case where the structural column has a columnar shape, it may have a polygonal columnar shape. In other words, the structural column is preferably cylindrical or polygonal.

Next, the relationship between the asymmetry of the unit structure in the load direction and the physical properties according to the embodiment will be described with reference to FIG. FIG. 6 is a diagram for explaining the relationship between the asymmetry of the unit structure in the load direction and physical properties according to the embodiment. FIG. 6 illustrates the compressive properties of an object. The compression characteristic is a curve (graph) representing the relationship between the stress [MPa] applied to an object and the compression ratio [%] (displacement) of the object due to the stress. In FIG. 6, compression characteristics were measured by planarly compressing an object formed by each unit structure in the direction of gravity.

In FIG. 6, the vertical axis of the graph corresponds to stress [MPa], and the horizontal axis of the graph corresponds to compression ratio [%]. "D4 100-15" indicates the curve when compressed for the unit structure "D4" (Fig. 5E), where the thickness of the structural column is "15" when the length of one side of the unit space is "100". . "D2A 100-12" indicates a curve at the time of compression of the unit structure "D2A" (Fig. 5B), in which the thickness of the structural column is "12" when the length of one side of the unit space is "100". . "D2B 100-12" indicates a curve when compressed for the unit structure "D2B" (Fig. 5C), where the thickness of the structural column is "12" when the length of one side of the unit space is "100". . "100-7" indicates a curve when compressing the unit structure (no deletion) of model A, where the thickness of the structural column is "7" when the length of one side of the unit space is "100". . "100-10" indicates a curve when compressing the unit structure (no deletion) of model A, where the thickness of the structural column is "10" when the length of one side of the unit space is "100". . "100-12" indicates a curve when compressing the unit structure (no deletion) of model A, where the thickness of the structural column is "12" when the length of one side of the unit space is "100". .

As shown in FIG. 6, in the unit structure of model A, which has no structural pillars, the slope at the early stage of compression (compression ratio of about 0 to 10%) and the slope at the end of compression (compression ratio of 50 % or more), the area of the graph (integrated value), etc. differed greatly. Here, the inclination at the initial stage of compression contributes to the "fitness" of the insole 10 . Also, the graph shape in the latter half of compression contributes to the “stress (hardness)” of the insole 10 . Also, the area of the graph contributes to the “shock absorption” of the insole 10 . From this, it can be concluded that in the unit structure of Model A, which does not have structural columns, physical properties such as fit, stress (hardness), and shock absorption change significantly simply by changing the thickness of the structural columns. was suggested.

For example, when compared to "100-10", the stress (hardness) and impact absorption of "100-12" are improved by making the structural columns thicker, while the slope at the initial stage of compression also changes significantly, resulting in a better fit. It suggests that you may lose your senses. On the other hand, if the structural columns are thinned, the stress (hardness) and impact absorption will decrease as shown in the graph of "100-7". From this, it was suggested that physical properties such as fit, stress (hardness), and impact absorption would change in conjunction with simply changing the thickness of the structural columns in the unit structure of model A. In other words, it is suggested that it is difficult to individually control physical properties such as fit, stress (hardness), and impact absorption within the desired range simply by changing the thickness of the structural columns in the unit structure of Model A. was done.

On the other hand, in the unit structure “D4”, the unit structure “D2A”, and the unit structure “D2B” according to the embodiment, the slopes at the early stage of compression were generally the same, but the slopes at the late stage of compression and the area of the graph were was different. Based on this, by changing the thickness of the structural column in the unit structure without the structural column, the stress (hardness) and impact absorption at a constant displacement can be adjusted to the desired level while maintaining the fit feeling almost constant. It was suggested that the range can be controlled. Therefore, compared to the case of using only the unit structure without the deletion of the structural column, when using the unit structure including the deletion of the structural column, the fit, stress (hardness), and shock absorption are more flexible. Therefore, it was suggested that the degree of freedom in design can be improved.

As described above, in the insole 10 of the embodiment, a plurality of unit structures each having a unit of n (n is an integer equal to or greater than 3) prismatic space are arranged. In addition, in the insole 10, at least one of the plurality of unit structures is positioned between the center of the space and p (p is an integer satisfying 2≤p≤(2n-1)) among the 2n vertices forming the n-prism shape. ) vertices and p structural pillars. As a result, the insole 10 of the embodiment has appropriate physical properties according to the application. For example, the insole 10 has appropriate physical properties according to the application even when there are restrictions on the external shape and materials due to the lack of structural pillars in the unit structure. In other words, according to this embodiment, it is possible to provide a three-dimensional structure having both an outer shape and physical properties suitable for the application.

In FIG. 6, the unit structure "D4" and the unit structure "D2A" had less distortion in the graph shape than the unit structure "D2B". The unit structure “D4” and the unit structure “D2A” are structures in which structural columns are connected to three vertices P2, P4, and P5 adjacent to the vertex P1 from which the structural column L1 is deleted. That is, it is preferable that structural columns are connected to vertices adjacent to vertices to which structural columns are not connected among the 2n vertices.

Further, in the unit structure "D2C" and the unit structure "D4", the structural column L7 is connected to the vertex P7 facing the vertex P1 from which the structural column L1 is deleted across the center point (point P9). That is, it is preferable that structural columns are connected to the vertices facing each other across the center from the 2n vertices to which the structural columns are not connected.

In addition, the insole 10 may be formed with one type of unit structure, or may be formed with a plurality of types of unit structures (including symmetrical unit structures and asymmetrical unit structures). For example, the entire insole 10 may be shaped by the unit structure "D1". In addition, in the insole 10 that is entirely formed by the unit structure "D1", the region A may be formed by another unit structure (for example, the unit structure "D2A").

Note that the "deletion" described in this embodiment can be replaced with, for example, "defect" and "missing". The descriptions such as "deleted", "defective", and "defective" are intended to indicate that some structural pillars are excluded compared to the original unit cell model, and the final product It is not the intention that the function of the orthosis is inferior.

(Orthosis manufacturing method)
The object (insole 10) described in the above embodiment is preferably modeled (manufactured) by a three-dimensional printer (3D-Printer). As a method for forming the insole 10 by a three-dimensional printer, an optical forming method or a powder forming method can be applied.

As the stereolithography method, for example, an SLA (Stereolithography) method, a DLP (Digital Light Projector) method, and an LCD (Liquid Crystal Display) method can be applied. The SLA method is a modeling method in which a liquid photocurable resin is selectively irradiated with a laser to photocure a modeling portion layer by layer, and the layers are laminated. Further, the DLP method is a modeling method in which a liquid photo-curable resin is planarly exposed using a projector and shaped at high speed. The LCD method is a molding method in which an image displayed on a liquid crystal panel (LCD) is projected onto a liquid photocurable resin using ultraviolet light as a backlight.

As the powder molding method, for example, a powder sintering layered molding method or a method using thermal fusion of powder resin can be applied. The powder sintering additive manufacturing method is a modeling method in which a powdered resin is selectively irradiated with a laser to sinter a modeled part. In addition, the method of thermally fusing powdered resin is a modeling method in which a melting accelerator is selectively sprayed onto the powdered resin, and then heated to fuse and laminate the parts to be shaped.

Here, a photo-curing resin is used in the optical molding method, and a thermoplastic resin is used in the powder molding method. In other words, the unit structure described in the above embodiment is shaped with photocurable resin or thermoplastic resin.

Note that the manufacturing method described above is merely an example, and the embodiments are not limited to this. For example, any modeling method can be applied as long as it can model a material having physical properties required for an object (three-dimensional structure) with the positional accuracy required for forming a unit structure.

(load direction)
In the above embodiment, for example, as shown in FIG. 3, the load direction corresponds to the vertically downward direction in the drawing, but the embodiment is not limited to this. For example, the direction of the unit structure within the brace can be appropriately set by the manufacturer. For example, in the case of a device worn on the hand, the normal direction at the point of contact between the hand and the device may be defined as the load direction. In this case, the unit structures in FIG. 3 are arranged in the brace so that the vertically downward direction in the figure corresponds to the normal direction at the point of contact with the human body.

According to the embodiments described above, it is possible to provide a three-dimensional structure having physical properties appropriate for the application. For example, the three-dimensional structure according to this embodiment is used as one of an elastic structure, a shock absorbing material, and a cushioning material. Each of the elastic structure, the shock absorbing material, and the cushioning material is, for example, sports gear used in the general sports field including parasports (sports for the disabled), and medical equipment used in the medical field such as nursing and nursing care. equipment (comedical aids), mobility parts used for various mobility (seat, backrest, handle, etc.), and construction materials.

10 Insole

Claims (12)

A plurality of unit structures are arranged in which n (n is an integer of 3 or more) prismatic space is arranged as a unit,
At least one of the plurality of unit structures is positioned between the center of the space and p (p is an integer satisfying 2≦p≦(2n−1)) out of 2n vertices forming the n-prism shape. having p structural pillars connecting the vertices,
three-dimensional structure. Among the 2n vertices, a vertex adjacent to a vertex to which the structural column is not connected is connected to the structural column.
The three-dimensional structure according to claim 1. Among the 2n vertices, the structural column is connected to a vertex that is opposite to the vertex that is not connected to the structural column across the center.
The three-dimensional structure according to claim 1. The unit structure has (n/2) or more structural pillars,
The three-dimensional structure according to any one of claims 1-3. The unit structure has asymmetry in the load direction,
The three-dimensional structure according to any one of claims 1-4. The n-prism shape is a quadrangular prism shape or a hexagonal prism shape,
The three-dimensional structure according to any one of claims 1-5. The structural column has a cylindrical shape or a polygonal column shape,
The three-dimensional structure according to any one of claims 1-6. The unit structure is shaped with a photocurable resin or a thermoplastic resin,
The three-dimensional structure according to any one of claims 1-7. Having appropriate physical properties according to the application,
The three-dimensional structure according to any one of claims 1-8. Combining external shape and physical properties according to the application,
The three-dimensional structure according to any one of claims 1-8. Used for either elastic structure, shock absorbing material, or cushioning material,
The three-dimensional structure according to any one of claims 1-10. Each of the elastic structure, the shock absorbing material, and the cushioning material is used for sports gear, co-medical equipment, mobility parts, and construction materials.
The three-dimensional structure according to claim 11.

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