Panel structure

Abstract

To improve rigidity against bending loads in multiple directions in a panel structure.SOLUTION: On a face plate 12, a plurality of cross protrusions 13 each of which protrudes in a thickness direction and is formed in a cross shape by placing a vertical protrusion 14, extending in a vertical direction, crosswise to a lateral protrusion 15, extending in a lateral direction, are arranged in the vertical direction and the lateral direction. On the face plate 12, a pattern is formed so that the vertical protrusion 14 forming the cross protrusion 13 extends arranged along the vertical protrusion 14 forming another cross protrusion 13 located adjacent to the cross protrusion 13 at one side in the vertical direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a panel structure. [Background technology]

[0002] The panel structure described in Patent Document 1 aims to improve rigidity by forming a pattern of many convex shapes on a metal plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-261360 Summary of the Invention [Problem to be solved by the invention]

[0004] Even if a large number of convex shapes are formed as a pattern, if the gaps between the convex shapes extend linearly, the rigidity against bending loads around the axis along the extending direction of the gaps is low. An object of the present invention is to increase the rigidity of a panel structure against bending loads in multiple directions. [Means for solving the problem]

[0005] A panel structure according to one aspect of the present invention includes a face material. Two different surface directions are defined as a vertical direction and a horizontal direction. The face material has a plurality of cross-shaped convex portions arranged in the vertical and horizontal directions, each of which is convex in the thickness direction and has a cross shape formed by intersecting a vertical convex portion extending in the vertical direction with a horizontal convex portion extending in the horizontal direction. The face material is patterned so that the vertical convex portions constituting one cross-shaped convex portion extend side by side along a vertical convex portion constituting another cross-shaped convex portion adjacent to the other cross-shaped convex portion on one side of the vertical direction. [Effects of the Invention]

[0006] According to the present invention, the gaps between the cross-shaped convex portions can be prevented from extending linearly, and therefore rigidity against bending loads in a plurality of directions can be increased. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing a panel structure. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 1 is a diagram illustrating a three-point bending test. [Figure 5] 10A and 10B are diagrams illustrating a three-point bending test on a panel structure. [Figure 6] FIG. 10 is a diagram illustrating the stiffness magnification. [Figure 7] FIG. [Figure 8] FIG. 1 is a diagram showing a comparative example 1. [Figure 9] FIG. 10 is a diagram showing Comparative Example 2. [Figure 10] FIG. 10 is a diagram showing Comparative Example 3. [Figure 11] FIG. 10 is a diagram showing the comparison results. [Figure 12] FIG. 10 is a diagram showing a comparative example in which the plate thickness is increased. [Figure 13] FIG. 10 is a diagram showing a comparative example in which a bent portion is provided. [Figure 14] FIG. 10 is a diagram showing a comparative example in which a number of convex shapes are patterned. [Figure 15] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the drawings are schematic and may differ from the actual product. Furthermore, the following embodiments exemplify devices and methods for embodying the technical concept of the present invention, and are not intended to limit the configuration to those described below. In other words, the technical concept of the present invention can be modified in various ways within the technical scope described in the claims.

[0009] <<Embodiment>> "composition" In the following description, the three mutually orthogonal directions are referred to as a vertical direction, a horizontal direction, and a thickness direction. FIG. 1 is a diagram showing a panel structure 11. (a) in the figure shows the panel structure 11 as viewed from the other side in the vertical direction, one side in the horizontal direction, and one side in the thickness direction. (b) in the figure shows the panel structure 11 as viewed from one side in the thickness direction. (c) in the figure shows the panel structure 11 as viewed from the other side in the vertical direction. The panel structure 11 is applied to sheet metal structures such as electrical panels, vending machines, and showcases, and is mainly used in areas where strength is required and where aesthetic appearance due to unevenness is not an issue, such as bottom panels and internal partition panels. The panel structure 11 is not limited to being made of metal, but may also be made of resin. The panel structure 11 has one face material 12. The face material 12 is patterned with multiple cross-shaped convex portions 13. The cross-shaped convex portion 13 is convex in the thickness direction and is formed by intersecting vertical convex portions 14 extending vertically and horizontal convex portions 15 extending horizontally.

[0010] FIG. 2 is a diagram showing the cross-shaped convex portion 13. As shown in FIG. 1A shows the basic pattern of the cross convex portion 13. The cross convex portion 13 has an oblique cross shape in which an intersection 21 between the vertical convex portion 14 and the horizontal convex portion 15 is formed at a position offset from both the longitudinal center of the vertical convex portion 14 and the longitudinal center of the horizontal convex portion 15. Therefore, the vertical convex portion 14 has a vertical long side portion 22 and a vertical short side portion 23, with the intersection 21 as the boundary, and the horizontal convex portion 15 has a horizontal long side portion 24 and a horizontal short side portion 25, with the intersection 21 as the boundary. Vertically adjacent cross convex portions 13 have shapes that are mirrored in the vertical direction, and the vertical convex portions 14 constituting one cross convex portion 13 are arranged so as to extend side by side along the vertical convex portions 14 constituting the other cross convex portion 13. Specifically, the vertical long side portion 22 constituting one cross convex portion 13 is arranged so as to extend side by side along the vertical long side portion 22 constituting the other cross convex portion 13 adjacent to it on one side of the vertical direction. The two vertically long sides 22 are close to each other in the horizontal direction without touching each other. (b) in the figure is a diagram explaining the pattern formation. The face material 12 has a pair of cross-shaped protrusions 13 as a basic pattern, which are aligned vertically and horizontally to form the pattern.

[0011] As a result, as shown in FIG. 1 , the vertical convex portions 14 constituting one cross convex portion 13 extend side by side along the vertical convex portions 14 constituting another adjacent cross convex portion 13 on one side of the vertical direction. Furthermore, the horizontal convex portions 15 constituting one cross convex portion 13 extend side by side along the horizontal convex portions 15 constituting another adjacent cross convex portion 13 on one side of the horizontal direction. At this time, the vertical long side portions 22 constituting the cross convex portion 13 extend side by side along the vertical long side portions 22 constituting the other adjacent cross convex portion 13 on one side of the vertical direction. Furthermore, the vertical short side portions 23 constituting the cross convex portion 13 extend side by side along the vertical short side portions 23 constituting the other adjacent cross convex portion 13 on the other side of the vertical direction. Specifically, the vertical long side portions 22 constituting the cross convex portion 13 extend further on the other side of the horizontal direction than the vertical long side portions 22 constituting the other adjacent cross convex portion 13 on one side of the vertical direction. Furthermore, the vertical short side portion 23 constituting the cross convex portion 13 extends further in the other horizontal direction than the vertical short side portion 23 constituting another adjacent cross convex portion 13 in the other vertical direction. Furthermore, the horizontal long side portion 24 constituting the cross convex portion 13 extends alongside the horizontal short side portion 25 constituting another adjacent cross convex portion 13 in one horizontal direction. Specifically, the horizontal long side portion 24 constituting the cross convex portion 13 extends further in the other vertical direction than the horizontal short side portion 25 constituting another adjacent cross convex portion 13 in one horizontal direction.

[0012] FIG. 3 is a diagram showing the vertical convex portion 14. As shown in FIG. (a) in the figure shows the vertical convex portion 14 as viewed from the vertical direction when no bending load is acting on the face material 12. The vertical convex portion 14 has a top surface 31 parallel to the face direction, and has a cross-sectional shape that is approximately trapezoidal. (b) in the figure schematically shows the vertical convex portion 14 as viewed from the vertical direction when a bending load is acting on the face material 12. The presence of the top surface 31 on the vertical convex portion 14 makes the face material appear as if its thickness has been increased by the height of the vertical convex portion 14, as shown by the hatched area. Therefore, the bending rigidity is improved compared to a face material that does not have a top surface 31 and has a cross-sectional shape that is approximately triangular or approximately semicircular. Here, the vertical convex portion 14 has been described, but the horizontal convex portion 15 is similar and therefore not shown in the figure.

[0013] Next, the three-point bending test will be described. FIG. 4 is a diagram illustrating the three-point bending test. Two mutually orthogonal directions in the plane direction are defined as the first direction and the second direction. (a) in the figure shows the state of a three-point bending test on the test piece 35 as viewed from the thickness direction. (b) in the figure shows the state of a three-point bending test on the test piece 35 as viewed from the first direction. In the three-point bending test, the test piece 35 is supported from one side by two support points 36 extending in the first direction on both sides of the second direction, and a bending load is applied to the test piece 35 from the other side by an indenter 37 extending in the first direction at the center of the second direction. This bends the test piece 35 along the bending deformation line Lb extending in the first direction. The distance between the support points 36 along the second direction is defined as Df.

[0014] FIG. 5 is a diagram illustrating a three-point bending test on the panel structure 11. (a) in the figure shows the panel structure 11 as viewed from one side in the thickness direction. When a three-point bending test is performed, the panel structure 11 is bent along the bending deformation line Lb. It is desirable that the longitudinal dimensions of the vertical convex portions 14 and the horizontal convex portions 15 be set to 0.7 times or more the distance Df between the support points 36 along the second direction. (b) in the figure shows the transmission path of the bending deformation line Lb. The panel structure 11 is patterned with cross-shaped convex portions 13, and the horizontal convex portions 15 perpendicular to the bending deformation line Lb exhibit high rigidity against bending loads. Because the numerous cross-shaped convex portions 13 are densely patterned in an intricate manner, the gaps between the cross-shaped convex portions 13 do not extend linearly. Therefore, the transmission path of the bending deformation line Lb will weave through the gaps between the cross-shaped convex portions 13, which have low rigidity, as shown by the thick solid line. However, it is unrealistic for the panel structure 11 to bend along such a transmission path. In reality, the panel structure 11 can only bend at the lateral protrusions 15, and since multiple lateral protrusions 15 are involved, the panel structure 11 exhibits high rigidity.

[0015] Example Next, an example will be described. FIG. 6 is a diagram illustrating the stiffness magnification. (a) in the figure is a graph showing displacement versus load when a nonlinear static analysis was performed on a flat plate simulating a three-point bending test. Here, the vertical axis represents load and the horizontal axis represents displacement. The region where load and displacement are proportional is the elastic region, and the slope at this point is defined as a stiffness multiplier of 1.0. (b) in the figure is a graph showing the stiffness multiplier when a three-point bending test was performed with different pattern angles. The pattern angles were 0 degrees, 45 degrees, 90 degrees, 135 degrees, and 180 degrees, but since a flat plate without a pattern was actually used, the same test specimen was used in all cases, and the stiffness multiplier was 1.0.

[0016] FIG. 7 is a diagram showing an embodiment. In the example, a nonlinear static analysis simulating a three-point bending test was performed on a panel structure 11 having the aforementioned skewed cross-shaped cross convex portion 13 patterned thereon. The panel structure 11 has a vertical dimension of 50 mm, a horizontal dimension of 150 mm, a thickness of the face material 12 of 1 mm, and a height of the cross convex portion 13 of 3 mm. The height of the cross convex portion 13 is the dimension from the top surface of the face material 12 to the top surface of the top surface 31. Therefore, the height of the cross convex portion 13 is added to the thickness of the face material 12, resulting in an overall thickness of the panel structure 11 of 4 mm. The longitudinal dimension of the vertical convex portion 14 and the longitudinal dimension of the horizontal convex portion 15 are both 35 mm, and the lateral dimension of the vertical convex portion 14 and the lateral dimension of the horizontal convex portion 15 are both 5 mm. The longitudinal dimensions of the vertical long side portion 22 and the horizontal long side portion 24 are both 19 mm, and the longitudinal dimensions of the vertical short side portion 23 and the horizontal short side portion 25 are both 11 mm. In a pair of vertically adjacent cross-shaped protrusions 13, the horizontal distance between the vertical protrusions 14 is 2 mm.

[0017] (a) in the figure shows a panel structure 11 with a pattern angle of 0 degrees. The pattern angle is not the rotation angle of the panel structure 11, but the angle of the pattern formed on the panel structure 11, and refers to the angle of the direction in which the vertical convex portions 14 extend relative to the vertical direction, or the angle of the direction in which the horizontal convex portions 15 extend relative to the horizontal direction. Although not shown here, the rigidity multiplier was calculated when a nonlinear static analysis simulating a three-point bending test was performed on panel structures 11 with pattern angles of 45 degrees, 90 degrees, 135 degrees, and 180 degrees. (b) in the figure is a graph showing the rigidity multiplier for each pattern angle. When the pattern angle was 0 degrees and 180 degrees, the rigidity multiplier was approximately 4.8, when the pattern angle was 45 degrees and 135 degrees, the rigidity multiplier was approximately 3.0 to 3.3, and when the pattern angle was 90 degrees, the rigidity multiplier was approximately 3.4.

[0018] FIG. 8 is a diagram showing a first comparative example. In Comparative Example 1, a nonlinear static analysis simulating a three-point bending test was performed on a panel structure 41 in which beam-like protrusions were patterned in a staggered arrangement. (a) in the figure shows a panel structure 41 with a pattern angle of 0 degrees. The pattern angle is the angle of the pattern formed on the panel structure 41, and refers to the angle of the direction in which the beam-like protrusions extend relative to the vertical direction. Although not shown here, the rigidity multiplier was calculated when a nonlinear static analysis simulating a three-point bending test was performed on panel structures 41 with pattern angles of 45 degrees, 90 degrees, 135 degrees, and 180 degrees. (b) in the figure is a graph showing the rigidity multiplier for each pattern angle. When the pattern angles were 0 degrees and 180 degrees, the rigidity multiplier was approximately 7.2, when the pattern angles were 45 degrees and 135 degrees, the rigidity multiplier was approximately 2.3, and when the pattern angle was 90 degrees, the rigidity multiplier was approximately 0.8. Therefore, although the maximum rigidity multiplier is high, the minimum rigidity multiplier is equivalent to that of a flat plate.

[0019] FIG. 9 is a diagram showing a second comparative example. In Comparative Example 2, a nonlinear static analysis simulating a three-point bending test was performed on a panel structure 42 in which circular embossed protrusions were patterned in a staggered arrangement. (a) in the figure shows the panel structure 42 with a pattern angle of 0 degrees. The pattern angle refers to the angle of the pattern formed on the panel structure 42. Although not shown here, the rigidity multiplier was calculated when a nonlinear static analysis simulating a three-point bending test was performed on panel structures 42 with pattern angles of 45 degrees, 90 degrees, 135 degrees, and 180 degrees. (b) in the figure is a graph showing the rigidity multiplier for each pattern angle. When the pattern angles were 0 degrees and 180 degrees, the rigidity multiplier was approximately 1.3, when the pattern angles were 45 degrees and 135 degrees, the rigidity multiplier was approximately 1.5, and when the pattern angle was 90 degrees, the rigidity multiplier was approximately 1.2. Therefore, although the difference in rigidity multiplier due to the pattern angle was small, the overall rigidity multiplier was low.

[0020] FIG. 10 is a diagram showing a comparative example 3. In Comparative Example 3, a nonlinear static analysis simulating a three-point bending test was performed on a panel structure 43 having a pattern of equilateral cross-shaped convex portions. The equilateral cross convex portions have a shape in which the intersection of the vertical and horizontal convex portions coincides with both the longitudinal center of the vertical convex portion and the longitudinal center of the horizontal convex portion. (a) in the figure shows a panel structure 43 with a pattern angle of 0 degrees. The pattern angle is the angle of the pattern formed on the panel structure 43. Although not shown here, the panel structure 43 also has pattern angles of 45 degrees, 90 degrees, 135 degrees, and 180 degrees. The rigidity multiplier was calculated when a nonlinear static analysis simulating a three-point bending test was performed on the panel structure 43. (b) in the figure is a graph showing the rigidity multiplier for each pattern angle. The rigidity multiplier was approximately 3.6 when the pattern angles were 0 degrees and 180 degrees, approximately 2.8 when the pattern angles were 45 degrees and 135 degrees, and approximately 3.6 when the pattern angle was 90 degrees. Therefore, the rigidity ratio is high at any pattern angle, but is inferior to the example with a skewed cross.

[0021] FIG. 11 is a diagram showing the comparison results. In the skewed cross example, the maximum stiffness multiplier is approximately 4.8 and the minimum stiffness multiplier is approximately 3.0. In the beam-shaped comparative example 1, the maximum stiffness multiplier is approximately 4.8 and the minimum stiffness multiplier is approximately 3.0. In the embossed comparative example 2, the maximum stiffness multiplier is approximately 1.5 and the minimum stiffness multiplier is approximately 1.2. In the regular cross comparative example 3, the maximum stiffness multiplier is approximately 3.6 and the minimum stiffness multiplier is approximately 2.8. Therefore, the skewed cross example has the second highest maximum stiffness multiplier after comparative example 1 and the highest minimum stiffness multiplier. As such, it was found that the skewed cross example has high stiffness against bending loads in multiple directions.

[0022] <<Action and Effect>> Next, the main effects of the embodiment will be described. The panel structure 11 includes a face material 12. Two mutually different surface directions are defined as the vertical direction and the horizontal direction. The face material 12 has a plurality of cross convex portions 13 arranged in the vertical and horizontal directions, each of which is convex in the thickness direction and has a cross shape formed by intersecting vertical convex portions 14 extending in the vertical direction and horizontal convex portions 15 extending in the horizontal direction. The face material 12 is patterned so that the vertical convex portions 14 constituting each cross convex portion 13 extend side by side along the vertical convex portions 14 constituting another cross convex portion 13 adjacent to it on one side of the vertical direction. This prevents the gaps between the cross convex portions 13 from extending linearly, thereby increasing rigidity against bending loads in multiple directions.

[0023] The face material 12 is patterned so that the horizontal protrusions 15 that make up the cross-shaped protrusions 13 extend side by side along the horizontal protrusions 15 that make up the other cross-shaped protrusions 13 that are adjacent to each other on one side of the horizontal direction. This prevents the gaps between the cross-shaped protrusions 13 from extending linearly, thereby increasing rigidity against bending loads in multiple directions. In the cross-shaped convex portion 13, the intersection 21 between the vertical convex portion 14 and the horizontal convex portion 15 is formed at a position that is shifted from both the longitudinal center of the vertical convex portion 14 and the longitudinal center of the horizontal convex portion 15. This prevents the gaps between the cross-shaped convex portions 13 from extending linearly, thereby increasing rigidity against bending loads in multiple directions.

[0024] The cross-shaped convex portions 13 have a shape that is vertically inverted relative to other vertically adjacent cross-shaped convex portions 13. This prevents the gaps between the cross-shaped convex portions 13 from extending linearly, thereby increasing rigidity against bending loads in multiple directions. Each vertical convex portion 14 has a long vertical side portion 22 and a short vertical side portion 23, with an intersection 21 as the boundary. The face material 12 is patterned so that the long vertical side portions 22 that make up a cross convex portion 13 extend side by side along the long vertical side portions 22 that make up another adjacent cross convex portion 13 on one side of the vertical direction. This prevents the gaps between the cross convex portions 13 from extending linearly, thereby increasing rigidity against bending loads in multiple directions.

[0025] The face material 12 is patterned so that the vertical short side portions 23 that make up one cross-shaped convex portion 13 extend alongside the vertical short side portions 23 that make up another adjacent cross-shaped convex portion 13 on the other side of the vertical direction. This prevents the gaps between the cross-shaped convex portions 13 from extending linearly, thereby increasing rigidity against bending loads in multiple directions. The face material 12 is patterned so that the long vertical sides 22 that make up the cross convex portion 13 extend further in the other horizontal direction than the long vertical sides 22 that make up another adjacent cross convex portion 13 on one side of the vertical direction. The face material 12 is patterned so that the short vertical sides 23 that make up the cross convex portion 13 extend further in the other horizontal direction than the short vertical sides 23 that make up another adjacent cross convex portion 13 on the other side of the vertical direction. This prevents the gaps between the cross convex portions 13 from extending linearly, thereby increasing rigidity against bending loads in multiple directions.

[0026] Each horizontal convex portion 15 has a horizontal long side portion 24 and a horizontal short side portion 25, with the intersection 21 as the boundary. The face material 12 is patterned so that the horizontal long side portions 24 that make up a cross convex portion 13 extend side by side along the horizontal short side portions 25 that make up another adjacent cross convex portion 13 on one side of the horizontal direction. This prevents the gaps between the cross convex portions 13 from extending linearly, thereby increasing rigidity against bending loads in multiple directions. The face material 12 is patterned so that the long horizontal sides 24 that make up a cross-shaped convex portion 13 extend further in the vertical direction than the short horizontal sides 25 that make up an adjacent cross-shaped convex portion 13 in the horizontal direction. This prevents the gaps between the cross-shaped convex portions 13 from extending linearly, thereby increasing rigidity against bending loads in multiple directions.

[0027] The vertical direction and the horizontal direction are perpendicular to each other, which makes it possible to increase rigidity against bending loads around an axis along the horizontal direction and an axis along the vertical direction. A top surface 31 parallel to the surface direction is formed on the cross-shaped convex portion 13. This makes the surface material appear as if its thickness has been increased by the height of the cross-shaped convex portion 13, improving bending rigidity. Two mutually orthogonal directions among the surface directions are defined as a first direction and a second direction. In the panel structure 11, the face material 12 is supported from one side by two support points 36 extending in the first direction on both sides of the second direction. At this time, the longitudinal dimension of the vertical convex portion 14 and the longitudinal dimension of the horizontal convex portion 15 are set to 0.7 times or more the distance Df between the support points 36 along the second direction. This increases rigidity against bending loads.

[0028] Other Comparative Examples To increase the rigidity of the face material, the thickness of the plate may be increased. FIG. 12 is a diagram showing a comparative example in which the plate thickness is increased. Here, an example is shown in which the plate thickness is increased from t1 to t2. Increasing the plate thickness is an easy method, but it is not realistic to increase the plate thickness by 4 times, 5 times, ... n times, as the cost increases with the increase in plate thickness, and the effect of increasing rigidity is not as great as expected. Furthermore, increasing the plate thickness reduces workability and makes handling difficult due to the increase in weight.

[0029] In order to increase the rigidity of the face material, a folded portion may be provided. FIG. 13 is a diagram showing a comparative example in which a bent portion is provided. (a) in the figure shows an example where a bent section is provided on one side of the face material. By providing a bent section on the face material, it is easy to increase the height and it also has a great effect in increasing rigidity, but it is difficult to increase the rigidity against bending loads in multiple directions. In this case, it is strong against bending loads in direction A, but weak against bending loads in direction B. (b) in the figure shows an example where a bent section is provided on all four sides of the face material. This makes it possible to increase the rigidity against bending loads in multiple directions, but since it is not possible to provide a bent section in the center of the face material, the rigidity is low.

[0030] To increase the rigidity of the face material, a number of convex shapes may be patterned. FIG. 14 is a diagram showing a comparative example in which a number of convex shapes are patterned. (a) in the figure shows a panel structure 41 in which beam-like protrusions are patterned in a staggered arrangement. This configuration is strong against bending loads around an axis along the vertical direction, but weak against bending loads around an axis along the horizontal direction. In other words, as shown by the thick solid lines, it is prone to bending along bending deformation lines. (b) in the figure shows a panel structure 42 in which circular embossed protrusions are patterned in a staggered arrangement. This configuration also tends to bend along bending deformation lines that run approximately vertically while avoiding the protrusions, or along diagonal bending deformation lines, as shown by the thick solid lines. Thus, even if a pattern of many protrusions is formed, if the gaps between the protrusions extend linearly, the rigidity against bending loads around an axis along the extension direction of the gaps is low.

[0031] <<Variation>> In the embodiment, the vertical convex portions 14 and the horizontal convex portions 15 reach the sides of the face material 12, but the present invention is not limited to this. That is, the vertical convex portions 14 and the horizontal convex portions 15 may not reach the sides 16 of the face material 12. FIG. 15 is a diagram showing a modified example. (a) in the figure shows a configuration in which the vertical convex portions 14 and the horizontal convex portions 15 reach the sides 16 of the face material 12. If the vertical convex portions 14 and the horizontal convex portions 15 reach the sides 16 of the face material 12, the end faces will be open, making them weak against bending loads. (b) in the figure shows a configuration in which the vertical convex portions 14 and the horizontal convex portions 15 do not reach the sides 16 of the face material 12. In other words, the vertical convex portions 14 and the horizontal convex portions 15 are shaped so that they end along the sides 16 just before the sides 16. This further increases rigidity against bending loads.

[0032] Although the present invention has been described above with reference to a limited number of embodiments, the scope of the invention is not limited thereto, and modifications of the embodiments based on the above disclosure will be obvious to those skilled in the art. [Explanation of symbols]

[0033] 11...Panel structure, 12...Face material, 13...Cross convex portion, 14...Vertical convex portion, 15...Horizontal convex portion, 16...Side, 21...Intersection, 22...Vertical long side portion, 23...Vertical short side portion, 24...Horizontal long side portion, 25...Horizontal short side portion, 31...Top surface, 35...Test piece, 36...Support point, 37...Indenter, 41...Panel structure, 42...Panel structure, 43...Panel structure

Claims

1. Equipped with face material, Two different directions among the surface directions are defined as a vertical direction and a horizontal direction, The panel structure is characterized in that the face material has a plurality of cross convex portions that are convex in the thickness direction and that are formed into a cross shape by crossing vertical convex portions extending in the vertical direction and horizontal convex portions extending in the horizontal direction, and are arranged in the vertical and horizontal directions, and the vertical convex portions that make up the cross convex portions are patterned so that they extend side by side along the vertical convex portions that make up other cross convex portions that are adjacent to each other on one side of the vertical direction.

2. The panel structure according to claim 1, characterized in that the face material is patterned so that the horizontal convex portions constituting the cross convex portion extend side by side along the horizontal convex portions constituting other cross convex portions adjacent to one side of the horizontal direction.

3. The panel structure according to claim 1, characterized in that the intersection of the vertical convex portion and the horizontal convex portion of the cross convex portion is formed at a position offset from both the longitudinal center of the vertical convex portion and the longitudinal center of the horizontal convex portion.

4. 4. The panel structure according to claim 3, wherein the cross-shaped convex portion has a shape that is inverted in the vertical direction with respect to another cross-shaped convex portion adjacent to the cross-shaped convex portion in the vertical direction.

5. The vertical convex portion has a vertical long side portion and a vertical short side portion formed on either side of the intersection, The panel structure according to claim 4, characterized in that the face material is patterned so that the vertically long side portions constituting the cross-shaped convex portion extend side by side along the vertically long side portions constituting other cross-shaped convex portions adjacent to one another on one side of the vertical direction.

6. The panel structure described in claim 5, characterized in that the face material is patterned so that the vertical short side portions that constitute the cross-shaped convex portion extend side by side along the vertical short side portions that constitute other adjacent cross-shaped convex portions on the other side of the vertical direction.

7. The panel structure described in claim 6, characterized in that the face material is patterned so that the long vertical side portions constituting the cross convex portion extend further in the other horizontal direction than the long vertical side portions constituting other cross convex portions adjacent to them in one of the vertical directions, and the short vertical side portions constituting the cross convex portion extend further in the other horizontal direction than the short vertical side portions constituting other cross convex portions adjacent to them in the other vertical direction.

8. The horizontal convex portion has a horizontal long side portion and a horizontal short side portion formed on either side of the intersection, The panel structure described in claim 3, characterized in that the face material is patterned so that the long horizontal sides that constitute the cross-shaped convex portion extend side by side along the short horizontal sides that constitute other cross-shaped convex portions adjacent to one another on one side of the horizontal direction.

9. The panel structure described in claim 8, characterized in that the face material is patterned so that the horizontal long side portion that constitutes the cross-shaped convex portion extends further in the other vertical direction than the horizontal short side portion that constitutes another cross-shaped convex portion adjacent to it in one horizontal direction.

10. The panel structure according to claim 1 , wherein the vertical direction and the horizontal direction are orthogonal to each other.

11. The panel structure according to claim 1 , wherein the cross-shaped convex portion has a top surface formed parallel to the surface direction.

12. The panel structure according to claim 1, characterized in that the cross-shaped convex portion is interrupted along the edge just before the edge so that the vertical convex portion and the horizontal convex portion do not reach the edge of the panel material.

13. Two directions perpendicular to each other among the planar directions are defined as a first direction and a second direction, The panel structure described in claim 1, characterized in that when the panel is supported from one side by two support points extending in the first direction on both sides of the second direction, the longitudinal dimension of the vertical convex portion and the longitudinal dimension of the horizontal convex portion are set to be 0.7 times or more the distance between the support points along the second direction.

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