Building board

Abstract

To prevent an appearance of a wall surface constituted of a building board where pseudo joints are formed to a design surface from being spoiled.SOLUTION: A design pattern part of a building board 10 has: multiple pattern units located side by side to a first direction; and pseudo joints extending up to both ends of the design pattern part in a second direction and partitioning the pattern units located side by side in the first direction. On a design surface 14 of the building board 10, multiple band-like patterns 51 extending in the second direction and having widths in the first direction wider than joint widths of the pseudo joints and multiple fine line patterns 53 extending in the second direction and having widths in the first direction narrower than the joint widths of the pseudo joints 31 are formed by coating per pattern unit.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a building board having a decorative surface. [Background technology]

[0002] As a building board for forming, for example, a wall portion of a building, a building board having a predetermined design surface, such as a ceramic siding board or a metal siding board, may be used. A wall surface is formed by arranging and joining a plurality of such building boards.

[0003] In the joints between building boards, there are cases where the joint width varies and the joints are misaligned. Therefore, Patent Documents 1, 2, and 3 describe building boards that make the joint width variation and the joint misalignment formed at the joints between building boards less noticeable. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-031721 A [Patent Document 2] JP 2013-167120 A [Patent Document 3] JP 2013-204336 A Summary of the Invention [Problem to be solved by the invention]

[0005] Some building boards have a pseudo joint formed on the design surface. In such a building board, the pseudo joint may be misaligned at the joint between the building boards, which may damage the aesthetics of the wall surface formed by the building boards. The misalignment of the pseudo joint may be caused, for example, by manufacturing errors in the dimensions of the building boards, or by cutting the end of the building board on the side where it will be joined to other building boards at the construction site, causing the dimensions between this end and the pseudo joint to vary for each building board.

[0006] The present invention has been made in consideration of the above problems, and has an object to provide a building board having pseudo joints formed on its design surface that minimizes the impairment of the aesthetic appearance of the wall surface formed by this building board. [Means for solving the problem]

[0007] Aspect 1 of the present invention for solving the above problem is a building board that is rectangular extending in a first direction and a second direction perpendicular to the first direction, has a back surface and a front surface, and has a design surface on at least the front surface, and is provided with a plurality of protrusions protruding in a direction from the back surface side to the front surface side, and a design pattern portion formed by the plurality of protrusions. The design pattern portion includes a plurality of protrusions, has a rectangular shape defined by the first direction and the second direction, has a plurality of pattern units adjacent to each other in the first direction, and has pseudo joints that extend to both ends of the design pattern portion in the second direction and divide the pattern units adjacent to each other in the first direction. The pattern units have a plurality of first band-like patterns formed by painting, extending in the second direction, and having a width in the first direction wider than the joint width of the pseudo joints, and a plurality of first thin line patterns formed by painting, extending in the second direction, and having a width in the first direction narrower than the joint width of the pseudo joints.

[0008] In the building board of the above configuration, when light is incident, a shadow is formed in the groove formed by the pseudo joint and the side of the pattern unit partitioned by this pseudo joint along the second direction, which is the direction in which this pseudo joint extends. At this time, the width of the shadow in the first direction changes depending on the angle of the light incident on the building board. Therefore, on the design surface of the building board, a shadow is formed along the second direction for each pattern unit, A plurality of band-like patterns whose width in a first direction is wider than the joint width of the pseudo joints, and a plurality of thin line patterns that extend in a second direction and whose width in the first direction is narrower than the joint width of the pseudo joints are formed by painting. As a result, the design surface is given a sense of shadow by the band-like patterns and thin line patterns in accordance with the direction in which the pseudo joints extend, so that people looking at the wall surface focus on the sense of shadow on the design surface, making it possible to make the misalignment of the pseudo joints that occurs at the joints between the building boards less noticeable.

[0009] In a second aspect of the present invention, adjacent pattern units in the first direction have different arrangements of the multiple convex portions in at least one of the first direction and the second direction, and the first band-shaped pattern extends along a row of convex portions formed by a plurality of convex portions arranged in the second direction.

[0010] As a result, the band-like pattern extends along the arrangement direction of the multiple protrusions on the design surface of the pattern unit, making it possible to express a sense of shadow according to the arrangement pattern of the protrusions and making the misalignment of the pseudo joints less noticeable.

[0011] In a third aspect of the present invention, the pattern unit has a plurality of block portions each consisting of a plurality of convex portions arranged in at least one of a first direction and a second direction, and block joints separating adjacent block portions.

[0012] This makes it possible to express the sense of shadow formed near the block joints on the design surface, and to present a sense of shadow that does not seem strange to the viewer.

[0013] In a fourth aspect of the present invention, a boundary between adjacent first band-like patterns in the first direction is located on at least one of the bottom surface of the pseudo joint and the top surface of the protrusion.

[0014] This makes it possible for the boundaries of the band-like pattern to overlap the pseudo joints, making the pseudo joints less noticeable.

[0015] In a fifth aspect of the present invention, the design surface is formed by painting, and has a plurality of second fine line patterns extending in a first direction and having a width in a second direction narrower than the joint width of the pseudo joint.

[0016] As a result, the second fine line pattern formed on the design surface extends in the direction in which the joints between adjacent building boards in the second direction extend, making the joints between the building boards less noticeable, and ultimately making the misalignment of the pseudo joints even less noticeable.

[0017] In a sixth aspect of the present invention, the design surface is formed by painting, and has a plurality of second band-like patterns extending in a first direction and having a width in a second direction wider than the joint width of the pseudo joint.

[0018] As a result, the second band-like pattern formed on the design surface extends in the direction in which the joints between adjacent building boards in the second direction extend, making the joints between the building boards less noticeable and ultimately making the misalignment of the pseudo joints even less noticeable.

[0019] In a seventh aspect of the present invention, the length in the second direction of at least one of the first thin line pattern and the first band-like pattern is shorter than the length in the second direction of the decorative design portion.

[0020] As a result, the length of the first thin line pattern in the second direction is shorter than the length of the decorative pattern portion in the second direction, and so attention is drawn to the length of the first thin line pattern, and it appears as if a building board with a long length in the second direction and a building board with a short length in the second direction are combined together.As a result, the joint positions of the building boards formed at both ends in the second direction of the building board and extending in the first direction do not appear to be lined up at regular intervals, making the joint lines extending in the first direction difficult to see.

[0021] In an eighth aspect of the present invention, the second thin line pattern is formed across adjacent pattern units in the first direction.

[0022] This makes it easier to focus attention on the top faces of the convex portions due to the boundaries of the band-like pattern than on the pseudo joints, making the misalignment of the pseudo joints less noticeable.

[0023] In a ninth aspect of the present invention, the first band-like pattern is formed across at least three convex portions aligned in the second direction.

[0024] As a result, the second thin line pattern is formed across adjacent pattern units in the first direction. In other words, the end in the direction in which the second thin line pattern extends is formed in the middle of adjacent pattern units across the pseudo joint, creating the illusion that the end of the pattern unit is formed in a position different from the position of the pseudo joint between the pattern units of the building board, making the misalignment of the pseudo joint less noticeable. Effect of the Invention

[0025] According to the present invention, it is possible to make the misalignment of the pseudo joints at the joints between the building boards less noticeable, and also to prevent deterioration of the aesthetic appearance of the wall surface formed by the building boards. [Brief description of the drawings]

[0026] [Figure 1] FIG. 1 is a view of a building board according to a first embodiment, seen from the design surface side. [Diagram 2] FIG. 2 is a photograph of the building board of the first embodiment, viewed from the design surface side. [Diagram 3] FIG. 3 is an enlarged view of a part of FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along the line AA in FIG. [Diagram 5] FIG. 5 is a cross-sectional view taken along line BB of FIG. [Figure 6] FIG. 6 is a diagram illustrating a design surface corresponding to the handle unit of the first embodiment. [Figure 7] FIG. 7 is a diagram illustrating a design surface corresponding to the handle unit of the first embodiment. [Figure 8] FIG. 8 is a diagram for explaining a pattern in the vicinity of the pseudo joint in the first embodiment. [Figure 9] FIG. 9 is a diagram for explaining a pattern in the vicinity of a pseudo joint according to the second embodiment. [Figure 10] FIG. 10 is a view of a building board according to a modified example, seen from the design surface side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] (First embodiment) Hereinafter, the building board according to this embodiment will be described with reference to the drawings. The building board 10 shown in Figures 1 to 5 is a board material used to construct wall parts such as exterior walls and interior walls of buildings. Note that Figure 3 shows the building board 10 shown in Figure 1 with some of the patterns omitted.

[0028] The building board 10 is an example of an exterior wall, and as shown in Figs. 4 and 5, it has a back surface 13 that faces the indoor side of the wall when constructed, and a design surface 14 on the front surface side opposite to the back surface 13. The building board 10 has a long side 11 extending in a left-right direction D1 that becomes left and right when constructed, and a short side 12 that is perpendicular to the left-right direction D1 and extends in a vertical direction D2 that becomes up and down when constructed. In other words, the building board 10 is a plate material whose shape is defined by the left-right direction D1 and the vertical direction D2. In the building board 10, the thickness direction D3 is defined based on the back surface 13. The thickness direction D3 is also a normal direction from the back surface 13 to the outdoor side. In this embodiment, the left-right direction D1 is an example of a first direction, the vertical direction D2 is an example of a second direction, and the thickness direction D3 is an example of a third direction.

[0029] The long sides 11, which are both edges in the vertical direction D2 of the building board 10, are formed with joints 15 and 16 for joining to other building boards. As shown in FIG. 4, with the back surface 13 facing downward, one (left) long side 11 in the vertical direction D2 has a lower joint 16. On the other side (right side) in the up-down direction D2, an upper joint 15 is formed to be paired with a lower joint 16. The upper joint 15 is a part called an upper joint, and the lower joint 16 is a part called a lower joint.

[0030] In this embodiment, the dimension of the long side 11 of the building board 10 is, for example, 910 [mm] to 4000 [mm]. The dimension of the short side 12 of the building board 10 is, for example, 303 [mm] to 1100 [mm]. The dimension of the thickness direction D3 of the building board 10 is, for example, 14 [mm] to 35 [mm]. The material of the building board 10 is, for example, ceramic siding, metal siding, cement board, concrete board, ALC (Autoclaved Lightweight Aerated Concrete) board, wood board, metal board, etc.

[0031] Each building board 10 is arranged so that the long side 11 is horizontal with the back surface 13 facing the mounting location in the building. That is, the short side 12 is arranged so that it is vertical. Next, by connecting the short sides 12 together, the length of the wall surface of the building can be extended left and right. Specifically, the building boards 10 are connected left and right with the direction in which the short sides 12 extend facing the top and bottom of the building. In this case, as shown in FIG. 5, the building boards 10 may be connected to each other via a joint material 70 such as a known sealant and a known hat joiner 71 between the short sides 12 of the building boards 10. At this time, the building boards 10 are connected to each other so that the long sides 11 of the building boards 10 adjacent to each other in the left-right direction D1 are in a straight line. In addition, by connecting the long sides 11 of the building boards 10 together via the lower joint 16 and the upper joint 15, the length of the wall surface of the building can be extended up and down. Hereinafter, the area formed at the joint between the lower joint 16 and the upper joint 15, i.e., the joint between the long sides 11, and the area formed at the left and right joints, i.e., the joint between the short sides 12, will also be referred to as joint joints.

[0032] In this embodiment, the building board 10 is configured to have a lower joint 16 (lower part) and an upper joint 15 (upper part) on the long side 11, but alternatively, the building board 10 does not have to have a lower joint 16 and an upper joint 15 on the long side 11.

[0033] The building board 10 has a base 18, a decorative pattern portion 17 that is continuous with the base 18 in the thickness direction D3, and a back surface 13. The base 18 is a rectangular portion defined by the left-right direction D1 and the up-down direction D2. The surface of the base 18 opposite the decorative pattern portion 17 is the back surface 13.

[0034] The design pattern portion 17 is a portion that forms the uneven pattern of the design surface 14 of the building board 10, and has a plurality of protruding portions 20 arranged in a lattice pattern. Here, the protruding portions 20 arranged in a lattice pattern refer to the protruding portions 20 that are arranged in the left-right direction D1 and the up-down direction D2, and are surrounded by joints arranged in a lattice pattern. The protruding portions 20 are substantially quadrangular pyramid portions having a rectangular top surface 21, and the cross section of the protruding portions 20 is substantially trapezoidal, and the top surface 21 of the protruding portions 20 is a portion that protrudes from the back surface 13 toward the front surface side, i.e., the design surface 14 side, in the thickness direction D3. The protruding portions 20 are arranged in a lattice pattern to form the uneven pattern on the design surface 14. The protruding portions 20 are rectangular, with the top surface 21 having dimensions of, for example, 20 [mm] to 50 [mm], and preferably rectangular. Details of the arrangement pattern formed by arranging the plurality of protruding portions 20 in a lattice pattern will be described later.

[0035] The design pattern portion 17 has multiple pattern units 30 and pseudo joints 31 that divide the multiple pattern units 30. As shown in FIG. 1, one pattern unit 30 is a rectangular portion defined by the left-right direction D1 and the up-down direction D2. The multiple pattern units 30 are adjacent to each other in the left-right direction D1 and are divided by the pseudo joints 31. In FIGS. 1 and 2, the positions of the pseudo joints 31 on the building board 10 are indicated by dashed lines so that the pattern units 30 can be distinguished from each other. Hereinafter, when distinguishing between the pattern units 30 that make up the design pattern portion 17, alphabets (a, b...) are added to the symbols.

[0036] As shown in Fig. 3, the pattern unit 30 is composed of a block portion 40 formed by an arrangement of a plurality of protrusions 20, and block joints 41 that divide the block portion 40. That is, the block portion 40 is formed by an arrangement of a plurality of protrusions 20, and the pattern unit 30 is formed by an arrangement of a plurality of block portions 40. Hereinafter, when distinguishing between the block portions 40 in the pattern unit 30, alphabets (a, b...) are added to the reference numerals.

[0037] The pseudo joint 31 extends to the long sides 11, which are both ends of the design pattern portion 17, in the vertical direction D2. That is, the pseudo joint 31 is a portion that, when the building board 10 is constructed as a wall surface, extends vertically relative to the building to pseudo-represent a joint joint, which is a joint between the short sides 12 of adjacent building boards 10. As shown in FIG. 5, the pseudo joint 31 is formed as a surface whose height in the thickness direction D3 is lower than the top surface 21 of the protrusion 20 when the back surface 13 is used as a reference. Specifically, the height H1 of the pseudo joint 31 in the thickness direction D3 is lower than the height H2 to the top surface 21 of the protrusion 20. In this embodiment, the height H1 of the pseudo joint 31 is equal to the height of the joint joint, and the joint width W, which is the width dimension of the pseudo joint 31 in the left-right direction D1, is approximately constant.

[0038] The pseudo joint 31 forms a groove that opens toward the design surface 14 side with respect to the back surface 13 at the boundary between the pattern units 30 adjacent to each other in the left-right direction D1 based on the pseudo joint 31. The angle between the pseudo joint 31 and the side surface 22 connecting the top surface 21 of the protrusion 20 of the pattern unit 30, i.e., the angle between the side surface 22 and the back surface 13, is, for example, 45° to 60°. It is preferable that this angle D is constant for all the pseudo joints 31. The joint width W of the pseudo joint 31, i.e., the width of the joint bottom surface, is 2mm to 8mm, and the joint depth, i.e., the length from the top surface 21 of the protrusion 20 to the joint bottom surface, is 4mm to 8mm.

[0039] The pattern unit 30 shown in Fig. 3 has two or more block parts 40 and block joints 41 that separate the block parts 40 from each other. In Fig. 3, the pattern unit 30a has a block part 40a, and block parts 40b and 40c arranged below the block part 40a in the vertical direction D2 in the figure. Each of the block parts 40a to 40c is separated by the block joints 41. The block parts 40 are not limited to being arranged in the vertical direction D2 via the block joints 41, but may be arranged in the horizontal direction D1, or may be arranged in a combination of the vertical direction D2 and the horizontal direction D1.

[0040] 4, in this embodiment, when the back surface 13 is used as a reference, the block joint 41 is formed as a surface whose height in the thickness direction D3 is lower than the top surface 21 of the protrusion 20 and is the same height as the pseudo joint 31. In other words, the height H3 of the block joint 41 in the thickness direction D3 is lower than the height H2 to the top surface 21 of the protrusion 20 and is the same height as the height H1 (FIG. 5) of the pseudo joint 31.

[0041] The block portion 40 has a plurality of protruding portions 20 arranged in a lattice pattern and protruding portion joints 45 that separate the protruding portions 20. The plurality of protruding portions 20 are arranged in a lattice pattern in the left-right direction D1 and the up-down direction D2 to form the block portion 40 having a rectangular shape defined by the left-right direction D1 and the up-down direction D2.

[0042] In the block portion 40, the intervals between the convex portions 20 arranged in a grid pattern vary according to the dimension of the joint bottom of the convex portion joints 45. As shown in FIG. 3, the convex portion joints 45 have a first convex portion joint 46 extending in the left-right direction D1 and a second convex portion joint 47 extending in the up-down direction D2. The first convex portion joints 46 and the second convex portion joints 47 have a wide dimensional portion and a narrower dimensional portion than the wide dimensional portion. Specifically, the first convex portion joints 46 have an expanded portion 46a whose dimension in the up-down direction D2 is larger than a predetermined dimension and a reduced portion 46b whose dimension in the up-down direction D2 is smaller than the predetermined dimension, thereby changing the arrangement pattern of the convex portions 20 arranged in the left-right direction D1. The second protruding joint 47 has an expanding portion 47a whose dimension in the left-right direction D1 is larger than a predetermined dimension, and a reducing portion 47b whose dimension in the left-right direction D1 is smaller than the predetermined dimension, thereby changing the arrangement pattern of the protruding portions 20 arranged in the second direction. As a result, the protruding portions 20 forming the surface shape of the design surface 14 are arranged in a lattice pattern, but the intervals between the protruding portions 20 are not uniform. For example, the joint width indicated by the predetermined dimension is 8 to 12 mm, the joint width of the expanding portion 47a is 10 to 25 mm, and the joint width of the reducing portion 47b is 3 to 10 mm.

[0043] 5, the convex joint 45 is formed as a surface that is lower than the top surface 21 of the convex portion 20 and higher than the pseudo joint 31 when viewed in the thickness direction D3 with the back surface 13 as the reference. In other words, the height H4 of the convex joint 45 in the thickness direction D3 is lower than the height H2 to the top surface of the convex portion 20 and higher than the height H1 of the pseudo joint 31. For example, H2-H4, i.e., the height of the convex joint, is 0.5 [mm] to 4 [mm].

[0044] Next, the pattern formed on the design surface 14 will be described with reference to FIG. 3 and FIGS. Figures 6 and 7 show the design surface 14 of one of the pattern units 30 of the building board 10 shown in Figure 3. The area defined by the thick solid lines shows the positions where the convex parts 20 and the convex joints 45 of the pattern unit 30 shown in Figure 3 are arranged in the up-down direction D2. Of these, Figure 7 is a simplified view of the pattern of the design surface 14 of the pattern unit 30 shown in Figure 8.

[0045] On the design surface 14, a first belt-like pattern 51, a second belt-like pattern 52, a first thin line pattern 53, and a second thin line pattern 54 are formed by painting. Specifically, the design surface 14 of the design pattern portion 17 is formed by a paint layer including the patterns 51, 52, 53, and 54, and a protective layer that protects the paint layer. The paint layer is formed by spraying ink onto the surface of the design pattern portion 17 with an inkjet painter. For example, a computer is used to create data on the pattern and color, and the inkjet painter is controlled based on the data to spray ink onto the surface side of the design pattern portion 17 to form a paint layer. In addition, the protective layer is formed by painting a clear paint using a painter such as a sprayer on the surface of the design pattern portion 17 on which the paint layer has been formed.

[0046] FIG. 8 shows an enlarged view of the periphery of the pseudo joint 31 in the design pattern portion 17. The first band-like pattern 51 extends in the vertical direction D2, and has a width in the horizontal direction D1 that is wider than the joint width W of the pseudo joint 31. A plurality of the first band-like patterns 51 are arranged in the horizontal direction D1 for each block portion 40a, 40b, 40c. Specifically, each of the first band-like patterns 51 arranged in the horizontal direction D1 extends in the vertical direction D2 along the direction in which the row of convex portions formed by arranging a plurality of the convex portions 20 in the vertical direction D2 in each block portion 40a, 40b, 40c arranged in a lattice shape extends. The first band-like pattern 51 may also be formed along a row of convex portions formed by arranging three or more in the vertical direction D2. The width of the first band-like patterns 51 formed in each block portion 40a, 40b, 40c may be different. The width of the first band-like pattern 51 in the left-right direction D1 is, for example, 50 mm to 100 mm.

[0047] The cross section in the joint width direction of the "joints" including the pseudo joints 31, block joints 41, and protruding joints 45 is formed into a substantially inverted trapezoid shape. Therefore, in this embodiment, the "joint width" is the width of the so-called joint bottom in the joint. In addition to this, the joint width may be the width of the opening on the opposite side to the joint bottom in the side wall part of the joint, that is, the width of the opening on the design surface 14 side in the groove formed by the joint and the side surface 22 of the protruding part 20 located adjacent to the joint as a reference.

[0048] As shown in FIG. 7, in each of the block portions 40a, 40b, and 40c, adjacent The overlapping first belt-like patterns 51 have different color schemes. The term "different color schemes" refers to the fact that one or more of the hue, saturation, brightness, and fill pattern of the color in the first belt-like patterns 51 are different. Here, the fact that the fill patterns are different means that the patterns formed by the inkjet coater are different, and for example, this means that the geometric patterns, such as checkered, striped, lattice, houndstooth, scale pattern, arabesque, cloisonné, thunder pattern, seigaiha, arabesque, and monogram, are different, or the color schemes of the pattern and the background are interchanged.

[0049] The first band-like pattern 51 has a high-brightness pattern 51a having a brightness higher than a predetermined brightness and a low-brightness pattern 51b having a brightness lower than a predetermined brightness due to differences in color scheme. Here, the predetermined brightness means, for example, the average brightness of the entire design surface 14. The high-brightness pattern 51a is a pattern that simulates a highlight area that appears brighter due to the incident light when light is incident on the pseudo joint 31. The low-brightness pattern 51b is a pattern that simulates a shadow area that appears darker due to the incident light when light is incident on the pseudo joint 31. In this embodiment, the high-brightness pattern 51a and the low-brightness pattern 51b are positioned adjacent to each other in the left-right direction D1 on the design surface 14, thereby expressing a sense of shadow including a highlight portion and a shadow portion on the design surface 14. The color scheme of the first band-shaped patterns 51 adjacent to each other in the left-right direction D1 may be any color that can express a sense of shadow, and high-brightness patterns 51a with different brightnesses, or low-brightness patterns 51b with different brightnesses may be positioned adjacent to each other.

[0050] As shown in FIG. 8, on the pseudo joint 31, that is, on the joint bottom or the side wall 22 of the pseudo joint 31, the boundary L between the first band-like patterns 51 adjacent to each other in the left-right direction D1 is located. This allows a pseudo shadow to be expressed on the pseudo joint 31, making the positional deviation of the pseudo joint 31 in the left-right direction D1 less noticeable. In addition, on the block joints 41 that divide the block portions 40, the boundary between the first band-like patterns 51 is also located. When the block portions 40 are adjacent to each other in the left-right direction D1 within the pattern unit 30, the first band-like patterns 51 may be formed across the block portions 40 adjacent to each other in the up-down direction D2. In addition, on the block joints 41, the boundary between the second band-like patterns 52 is also located. When the block portions 40 are positioned adjacent to each other in the up-down direction D2 within the pattern unit 30, the second band-shaped pattern 52 may be formed across the block portions 40 positioned adjacent to each other in the left-right direction D1.

[0051] A second belt-like pattern 52 extending in the left-right direction D1 is formed on the design surface 14. The second belt-like pattern 52 extends in the left-right direction D1, and has a width in the up-down direction D2 wider than the joint width W of the pseudo joint 31. The color tone of the intersection between the first belt-like pattern 51 and the second belt-like pattern 52 is drawn with either the first belt-like pattern 51 or the second belt-like pattern 52, or a color intermediate between them. In addition, the filling pattern of the intersection is drawn with either pattern, an intermediate pattern between the two patterns, or a pattern different from the two patterns. The filling pattern is the same as the filling pattern described above.

[0052] In this way, due to the change in color or filling pattern at the intersections, for example, the first band-like pattern 51 may appear to be divided midway by the second band-like pattern 52, multiple parallel first band-like patterns 51 may be connected to appear as a wide band, or the first and second band-like patterns 51, 52 may appear to be disconnected at each intersection. In other words, the line of sight is more likely to be focused on the first and second band-like patterns 51, 52, making the joining joints of the building boards 10 less noticeable, and even if the pseudo joints 31 are misaligned, the misalignment of the pseudo joints 31 can be made less noticeable.

[0053] As shown in Figs. 6 and 7, the first thin line patterns 53 extend in the up-down direction D2 on the design surface 14, and have a width in the left-right direction D1 that is narrower than the joint width W of the pseudo joint 31. In each block portion 40a, 40b, and 40c, the multiple first thin line patterns 53 have different lengths in the up-down direction D2. Among them, even the one having the longest length dimension in the vertical direction D2 is shorter than the length dimension in the vertical direction D2 (i.e., the dimension of the short side 12) of the decorative pattern portion 17. Among the first thin line patterns 53 formed on each of the block portions 40a, 40b, 40c, some are formed across each of the block portions 40 in the vertical direction D2.

[0054] The second thin line pattern 54 extends in the left-right direction D1 on the design surface 14, and has a width in the up-down direction D2 narrower than the joint width W of the pseudo joint 31. In this embodiment, the second thin line pattern 54 may be formed across adjacent pattern units 30 in the left-right direction D1 on the design surface 14.

[0055] The first and second thin line patterns 53, 54 have a different color scheme from the first and second band patterns 51, 52 that are the bases of the first and second thin line patterns 53, 54. Therefore, the first and second thin line patterns 53, 54 and the first and second band patterns 51, 52 are visually perceived as being separated in the middle due to the change in the shading at the intersection where they intersect. This makes it appear as if the variation of shading formed on the design surface 14 has increased, and the line of sight is focused on the difference in shading, making the misalignment of the pseudo joint 31 on the joining joint surface less noticeable. In addition, the intersection between the first thin line pattern 53 and the second thin line pattern 54 has the same relationship as the intersection between the first band pattern 51 and the second band pattern 52.

[0056] The first and second thin line patterns 53, 54 have a width of, for example, about 5 mm to about 10 mm, and a length of, for example, about 100 mm to about 1000 mm.

[0057] The above-described embodiment provides the following advantages. The building boards 10 are joined together in the left-right direction D1 and the up-down direction D2 to form a wall surface of a building. Due to manufacturing errors of the building boards 10 and errors when cutting the building boards 10 parallel to the short sides 12 at the construction site, the dimension from the end in the left-right direction D1 to the pseudo joint 31 may vary for each building board 10. For this reason, the joints of the pseudo joints 31 may be misaligned at the joints near the long sides 11 of the building boards 10. However, the design surface 14 of the building board 10 expresses a pseudo shadow effect by the first stripe pattern 51 and the first thin line pattern 53 in accordance with the second direction in which the pseudo joints 31 extend. As a result, when the wall surface is viewed, the shadow effect of the design surface 14 is easily focused on, making it possible to make the misalignment of the pseudo joints 31 at the joints less noticeable.

[0058] Since the first band-like pattern 51 extends along the arrangement direction of the multiple protrusions 20 in the pattern unit 30 that constitutes the design pattern portion 17, it is possible to express a sense of shadow according to the arrangement pattern of the protrusions 20 on the design surface 14. This makes it possible to suitably make the misalignment of the pseudo joints 31 less noticeable.

[0059] The pattern unit 30 has a plurality of block portions 40 each made up of a plurality of protruding portions 20 arranged in a grid pattern, and block joints 41 that divide adjacent block portions 40 in the left-right direction D1 or the up-down direction D2. This allows the first stripe pattern 51 and the first thin line pattern 53 to simulate a sense of shadow formed near the block joints 41, thereby allowing a sense of shadow that does not seem strange to a person viewing the wall surface formed by the building board 10.

[0060] On the design surface 14, the boundary L of the first band-like patterns 51 adjacent to each other in the left-right direction D1 is located on the pseudo joint 31. As a result, the boundary L of the first band-like patterns 51 overlaps with the pseudo joint 31, making the misalignment of the pseudo joint 31 less noticeable.

[0061] The second thin line pattern 54 formed on the design surface 14 extends in the direction of a joint between adjacent building boards 10 in the vertical direction D2, that is, in the left-right direction D1. Therefore, the joints between the upper and lower building boards 10 are made less noticeable, and the misalignment of the vertically connected pseudo joints 31 is made even less noticeable.

[0062] Since the second band-like pattern 52 formed on the design surface 14 extends in the direction in which the joints between adjacent building boards 10 extend in the vertical direction D2, the joints between the building boards 10 in the vertical direction D2 are made less noticeable, and thus the misalignment of the pseudo joints 31 is made even less noticeable.

[0063] The length dimension in the vertical direction D2 of the first fine line pattern 53 extending in the vertical direction D2 is shorter than the length dimension in the vertical direction D2 of the design pattern portion 17. In other words, at least one end of the first fine line pattern 53 does not intersect with the joint on the long side 11 side of the design surface 14. As a result, the pseudo joint 31 extending in the same direction as the first fine line pattern 53 becomes less noticeable due to the pattern formed on the design surface 14, and the misalignment of the joint of the pseudo joint 31 can be made less noticeable.

[0064] On the design surface 14, the second thin line pattern 54 extending in the vertical direction D2 is formed across adjacent pattern units 30 in the first direction, so that a sense of shading across a plurality of pattern units 30 can be expressed on the design surface 14. This makes the pseudo joints 31 that separate the pattern units 30 less noticeable, and by extension, the adjacent pattern units 30 are aligned with each other and look like a single pattern unit, so that when a wall surface is constructed, the misalignment of the pseudo joints 31 is less noticeable.

[0065] Second embodiment In the second embodiment, the configuration different from the first embodiment will be mainly described. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will not be repeated.

[0066] In the first embodiment, the boundary of the band-like patterns 51 adjacent to each other in the left-right direction D1 was located on the pseudo joint 31. Instead of or in addition to this configuration, as shown in Fig. 9, the boundary L of the band-like patterns 51 adjacent to each other in the left-right direction D1 is located on the top surface 21 of the protrusion 20. This makes it easier to focus on the boundary of the band-like patterns 51 formed on the top surface 21 of the protrusion 20, making the misalignment of the pseudo joint 31 at the joining joint even less noticeable.

[0067] (Other embodiments) The configuration of the building board 10 is not limited to the above-described embodiment, but can be modified in various ways without departing from the spirit of the invention. For example, the following modifications are also possible. In the above embodiment, the edge of the handle unit 30 in the left-right direction D1 was formed by the side surface 22 of the protrusion 20. Therefore, the pseudo joint 31 was sandwiched in the left-right direction D1 by the side surface 22 of the protrusion 20 to form a concave groove. Instead, in this embodiment, as shown in FIG. 10, the block portion 40 constituting the handle unit 30 has a seat portion 60 that is one step lower in the thickness direction D3 than the protrusion 20. In other words, in the block portion 40 of this embodiment, the protrusion 20 protrudes from the front surface side of the seat portion 60 in the thickness direction D3. In this embodiment, the height H5 from the back surface 13 to the seat portion 60 is higher than the height H1 to the joint bottom of the pseudo joint 31 and is lower than the height H2 to the top surface 21 of the protrusion 20. In Figure 10, for example, pseudo joint 31a forms a concave groove by being sandwiched in the left-right direction D1 between the side surface of seat portion 60 in block portion 40 constituting handle unit 30a and the side surface of seat portion 60 in block portion 40 constituting handle unit 30b.

[0068] In the above embodiment, the first and second band-like patterns 51, 52 are formed on the design surface 14 by painting using an inkjet paint machine. Alternatively, the first and second band-like patterns 51, 52 may be formed by embossing the design surface 14. The first and second band-like patterns 51, 52 may be formed by embossing the design surface 14 to resemble, for example, sedimentary rock such as sandstone or granite. The first and second band-like patterns 51, 52 may be formed with a pattern of a cleavage surface of igneous rock such as a rock, a broken stone surface, an ashlar surface, a masonry surface, a brick surface, or the like. In addition, the first and second band-like patterns 51, 52 may be formed with a pattern that forms the surface shape of, for example, mortar, a mud wall, a plaster, a piled roof tile, a cloth grain, a wood grain, or the like. It is also possible to combine the above-mentioned painting and embossing. In this way, a realistic design pattern portion 17 can be formed, and the design of the building board 10 can be improved.

[0069] In the above embodiment, the first and second belt-like patterns 51, 52 are formed on the design surface 14. Alternatively, the second belt-like pattern 52 may not be formed on the design surface 14, and only the first belt-like pattern 51 may be formed.

[0070] In the above embodiment, the first and second thin line patterns 53, 54 are formed on the design surface 14. Alternatively, the second thin line pattern 54 may not be formed on the design surface 14, and only the first thin line pattern 53 may be formed.

[0071] In the above embodiment, the joints 15, 16 are formed on the long side 11 of the building board 10. In addition to the long side 11 of the building board 10, a pair of joints may be formed on the short side 12 as well. That is, the building board 10 may be a board material having four sides joined together.

[0072] In the above embodiment, the entire area of ​​the front surface of the building board 10 is configured as the design surface 14. Alternatively, a portion of the area of ​​the front surface of the building board 10 may be configured as the design surface 14. In this case, the design pattern portion 17 only needs to form the design surface 14 by arranging a plurality of protrusions 20 in the left-right direction D1 and the up-down direction D2, and is not limited to being arranged in a lattice pattern. [Explanation of symbols]

[0073] 10...Building board, 13...Back side, 14...Design surface, 17...Design pattern part, 18...Base, 20…Convex part, 21...Top surface, 22…side, 30…Pattern unit, 31...Pseudo joint, 40…Block section, 41…Block joint, 45…Convex joint, 51…First band pattern, 53…First thin line pattern,

Claims

1. A building board having a rectangular shape extending in a first direction and a second direction perpendicular to the first direction, a back surface and a front surface, and a design surface on at least the front surface, A plurality of protrusions protruding in a direction from the back surface side toward the front surface side; A design pattern portion formed by a plurality of the protrusions, The design pattern portion is A plurality of the protrusions are included, A shape defined by the first direction and the second direction is a rectangle, and a plurality of pattern units are positioned adjacent to each other in the first direction; A pseudo joint that extends to both ends of the design pattern portion in the second direction and divides the pattern units adjacent to each other in the first direction; having The handle unit is A plurality of first band-like patterns formed by painting, extending in the second direction, and having a width in the first direction wider than the joint width of the pseudo joint; a plurality of first thin line patterns formed by painting, extending in the second direction, and having a width in the first direction narrower than the joint width of the pseudo joint; Architectural board.

2. The pattern units adjacent to each other in the first direction have different arrangements of the protrusions in at least one of the first direction and the second direction, The first belt-like pattern extends along a row of protrusions formed by arranging a plurality of the protrusions in the second direction.

2. The building board according to claim 1.

3. The handle unit is a plurality of block portions each including the protruding portions arranged in at least one of the first direction and the second direction; and a block joint that divides the adjacent block portions.

3. A building board according to claim 1 or 2.

4. A boundary between adjacent first band-shaped patterns in the first direction is located on at least one of a bottom surface of the pseudo joint and a top surface of the protrusion. The building board according to any one of claims 1 to 3.

5. The design surface is formed by painting, and has a plurality of second fine line patterns extending in the first direction and having a width in the second direction narrower than a joint width of the pseudo joint. The building board according to any one of claims 1 to 4.

6. The design surface is formed by painting, and has a plurality of second band-like patterns extending in the first direction and having a width in the second direction wider than a joint width of the pseudo joint. The building board according to any one of claims 1 to 5.

7. A length in the second direction of at least one of the first thin line pattern and the first band-like pattern is shorter than a length in the second direction of the design pattern portion. The building board according to any one of claims 1 to 6.

8. The building board according to claim 5 , wherein the second thin line pattern is formed across the pattern units adjacent to each other in the first direction.

9. The first belt-like pattern is formed across at least three of the protrusions aligned in the second direction. The building board according to any one of claims 1 to 8.

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