Building board

Abstract

To provide a building board that not only gives a three-dimensional feeling by painting, but has high designability by a different method.SOLUTION: A building board 1 has a plurality of long grooves 2, having a plurality of depths, on a surface of a plate-like base material. A plurality of projection stripes 3 are formed on the surface of the plate-like base material, and sectioned with the plurality of long grooves 2. The plurality of projection stripes 3 have top parts 6 differing in width and the top parts 6 are equal in height. The plurality of projection stripes 3 include at least one narrowest projection stripe 3a which is smallest in width. A shallowest long groove 2a of minimum depth among the plurality of long grooves 2 adjoins a first end edge 3c of at least one specific narrowest projection stripe 3b among narrowest projection stripes 3a. The deepest long groove 2b among the plurality of long grooves 2 adjoins a second end edge 3d of the specific narrowest projection stripe 3b.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a building board that constitutes the exterior walls, interior walls, etc. of a building. [Background technology]

[0002] The building board is made of ceramic materials, metal materials, etc. The surface of the building board may be decorated with a brickwork design, a stonework design, or a tiled design, for example. The building board disclosed in Patent Document 1 is a horizontally long rectangle divided into upper and lower sections by a single horizontal groove. Each section of the upper and lower sections is divided into multiple rows of regions by multiple vertical grooves. A predetermined number of each region is painted as one unit. The vertical grooves are painted in the same color as the horizontal grooves, and the width, pitch, and depth of the vertical grooves are adjusted. This gives the surface of the building board a design.

[0003] The building board disclosed in Patent Document 2 has recesses extending vertically and horizontally on its surface. The recesses divide the board into a number of protruding sections. There are inclined surfaces between the recesses and protruding sections. The portion from the edge of the protruding section to the middle of the inclined surface is painted a darker color than the color of the protruding section. This emphasizes the uneven shape of the surface of the building board, creating a three-dimensional effect. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-141942 A [Patent Document 2] JP 2000-334341 A Summary of the Invention [Problem to be solved by the invention]

[0005] In general, fine rib patterns are considered to have high design value when the ridges are narrow and the long grooves are deep. However, in ceramic building boards, in order to maintain strength, narrower ridges require shallower long grooves, while deeper long grooves require wider ridges. To create or amplify a three-dimensional effect beyond the actual surface shape, the use of painting techniques has been mainstream, but there is a demand for building boards with high design value using methods other than painting techniques. [Means for solving the problem]

[0006] According to one embodiment of the present disclosure, a building board has a plurality of long grooves with a plurality of different depths formed on the surface of a plate-shaped base material. A plurality of ridges are formed on the surface of the plate-shaped base material and are partitioned by a plurality of long grooves. The plurality of ridges have peaks with a plurality of different widths, and the peaks have the same height. The plurality of ridges includes at least one narrowest ridge having the narrowest width. A shallowest long groove having the smallest depth among the plurality of long grooves is adjacent to a first edge that is one end side of at least one specific narrowest ridge among the narrowest ridges. A deepest long groove having the greatest depth among the plurality of long grooves is adjacent to a second edge that is the other end side of the specific narrowest ridge.

[0007] Therefore, by providing multiple long grooves with multiple depths, differences in shading occur for each long groove. Therefore, even if the heights of the tops of multiple convex ridges are the same, a visual effect of surface steps can be obtained. Furthermore, the specific narrowest convex ridge is provided between the shallowest long groove with the smallest depth and the deepest long groove with the largest depth. The deepest long groove creates a solid shadow on the specific narrowest convex ridge, further emphasizing the specific narrowest convex ridge. In other words, a vertically long thin rib pattern is expressed, providing a high level of design.

[0008] According to another aspect of the present disclosure, the building board has a dividing groove that intersects the plurality of long grooves and is deeper than the plurality of long grooves, dividing the surface into a first region and a second region. This provides the surface of the building board having a vertically long thin rib pattern with a highly aesthetic appearance having a small split feel.

[0009] According to another aspect of the present disclosure, the plurality of long grooves each have a linear bottom surface with a constant bottom width, and a center line of the bottom width of the plurality of long grooves in the first region and a center line of the bottom width of the plurality of long grooves in the second region are not located on the same line in at least 70% of all the long grooves. This reduces the proportion of convex stripes between adjacent building boards that are connected in straight lines, making it difficult for patterns to appear accentuated on the construction surface. In addition, the misalignment of patterns on the surface between adjacent building boards is less noticeable.

[0010] According to another aspect of the present disclosure, the centerlines of the plurality of slots in the first region and the centerlines of the plurality of slots in the second region are not all collinear. This further reduces the proportion of convex stripes between adjacent building boards that are connected in straight lines, making it less likely that patterns that are accentuated on the construction surface will occur. Also, the misalignment of patterns on the surface between adjacent building boards will be less noticeable.

[0011] According to another aspect of the present disclosure, a pattern including concave and convex portions is provided on the surface of the plurality of convex stripes. The tops of the plurality of convex stripes, including the convex portions of the pattern, have the same height. This disperses or changes the light reflection on the surface of the building board, resulting in a highly aesthetically pleasing exterior with a different texture.

[0012] According to another aspect of the present disclosure, the plurality of long grooves have the same bottom width at their bottom surfaces or the same opening width at their openings. This creates a visual effect in which the width of the multiple long grooves is uniform and the multiple protrusions are emphasized, resulting in a more aesthetically pleasing vertically long thin rib pattern.

[0013] According to another aspect of the present disclosure, each of the plurality of long grooves has a bottom surface and an opening located on the opposite side of the bottom surface between the crests of the ridges. The plurality of long grooves includes a plurality of first long grooves having a first depth and a plurality of second long grooves having a second depth deeper than the first depth. The bottom widths of the bottom surfaces of the plurality of first long grooves are different from the bottom widths of the bottom surfaces of the plurality of second long grooves. Alternatively, the first opening widths of the openings of the plurality of first long grooves are different from the second opening widths of the openings of the plurality of second long grooves. This allows the multiple long grooves to have different shapes, resulting in differences in shading for each long groove, and a highly aesthetically pleasing appearance in which the vertically long thin rib pattern is arranged more randomly.

[0014] According to another aspect of the present disclosure, the plurality of ridges include side walls that have the same inclination angle relative to the surface. This allows the shadows to look more uniform.

[0015] According to another aspect of the present disclosure, the bottom width of the bottom surfaces of the plurality of long grooves is the same, so that the deeper the grooves are, the larger the opening width of the openings are. This results in different intervals between the multiple protrusions, resulting in a highly aesthetically pleasing exterior with a randomly arranged vertically elongated thin rib pattern. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a front view of the building board according to the first embodiment. [Diagram 2] FIG. 2 is a view taken in the direction of the arrow II in FIG. [Diagram 3] FIG. 2 is a view taken in the direction of the arrow III in FIG. [Figure 4] FIG. 2 is a partially enlarged view of a portion IV in FIG. [Diagram 5] 5 is a view taken in the direction of the arrow V in FIG. 4. [Figure 6] FIG. 2 is a partially enlarged perspective view of a surface of the building board according to the first embodiment. [Figure 7] 13A and 13B are diagrams showing examples of patterns at the tops of ridges on a building board. [Figure 8] 13A and 13B are diagrams showing examples of patterns at the tops of ridges on a building board. [Figure 9] FIG. 11 is a front view of a building board according to a second embodiment. [Figure 10] FIG. 10 is a partially enlarged view of X in FIG. [Figure 11] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] First Embodiment First, a first embodiment of the present invention will be described with reference to Fig. 1 to Fig. 8. The building board 1 according to this embodiment is a building board material having a substantially rectangular shape for forming, for example, the exterior wall of a building, and is, for example, a horizontally long rectangular shape. The building board 1 is, for example, an exterior wall material made of a ceramic base material produced by press molding a raw material made of cement or the like.

[0018] As shown in FIG. 1, in the description of the building board 1, when the building board 1 is constructed as an exterior wall or the like, the horizontal direction is defined as the left-right direction. The vertical direction that is the upper side is defined as the up direction, and the vertical direction that is the lower side is defined as the down direction. The surface of the building board 1 on which the design surface 1a that will become the surface of the exterior wall or the like (plate-shaped base material) is formed is defined as the front surface, and the surface opposite the design surface 1a on which the design surface is not formed is defined as the back surface 50. The size of the design surface 1a of the building board 1 is, for example, approximately 455×1820 mm. The thickness of the building board 1 is, for example, approximately 16.0 mm.

[0019] The building board 1 has a left joint 13 at its left end and a right joint 14 at its right end. As shown in FIG. 2, the left joint 13 forms a front side region having a thickness approximately half that of the building board 1 by cutting the back side of the left end. The right joint 14 forms a back side region having a thickness approximately half that of the building board 1 by cutting the front side of the right end. With this configuration, when multiple building boards 1 are installed adjacent to each other in the left-right direction, the left joint 13 and the right joint 14 fit together to form the left-right joint of the building board 1.

[0020] As shown in Fig. 1, the building board 1 has an upper joint 15 at its upper end and a lower joint 16 at its lower end. As shown in Fig. 3, the upper joint 15 has a thickness of about half the thickness of the building board 1 by cutting the front side of the upper end, and constitutes the back side region. The lower joint 16 has a thickness of about half the thickness of the building board 1 by cutting the back side of the lower end, and constitutes the front side region. With this configuration, when multiple building boards 1 are installed adjacent to each other in the vertical direction, the upper joint 15 and the lower joint 16 are fitted together to form the upper and lower joints of the building board 1.

[0021] 4 to 6, a plurality of long grooves 2 and a plurality of ridges 3 are alternately formed on the design surface 1a. The plurality of long grooves 2 and the plurality of ridges 3 each extend from the upper end to the lower end of the design surface 1a along the vertical direction of the building board 1.

[0022] That is, the multiple protruding strips 3 are partitioned by multiple long grooves 2. As shown in Figs. 5 and 6, the protruding strip 3 has a substantially trapezoidal cross-sectional shape, and has a top 6 that is the most obverse side of the design surface 1a, and two side walls 7 that are inclined surfaces located on both sides of the top 6. The two side walls 7 consist of a right side wall 7a located on the right side of the top 6 and a left side wall 7b located on the left side of the top 6. The heights of the tops 6 of the protruding strips 3 are set to be the same. In other words, the heights of the tops 6 on the design surface 1a (surface) are uniform and are located on the same imaginary plane P. Here, the height of the top 6 refers to the distance from the back surface 50 of the building board 1 to the top 6 in the direction from the back surface 50 of the building board 1 to the design surface 1a (surface).

[0023] As shown in Fig. 6, a pattern 10 is provided on the surface of the top 6 of the convex rib 3, forming the design of the convex rib 3. The pattern 10 includes a concave portion 10a and a convex portion 10b, and the top 6 of the convex rib 3 has the same height including the convex portion 10b. For the pattern 10, for example, a matte pattern 11 shown in Fig. 7 or a stucco pattern 12 shown in Fig. 8 is selected.

[0024] As shown in FIG. 6, the inclination angle α of both side walls 7 of the convex strip 3 is set to be the same. The inclination angle α of the right side wall 7a is opposite to that of the left side wall 7b. The inclination angle α of the side wall 7 refers to an angle with respect to an imaginary plane P formed by the back surface 50 or the top 6 of the building board 1. The inclination angle α is, for example, about 45° to 80°, and preferably about 60°. In this embodiment, the inclination angle α of the right side wall 7a is the same as that of the left side wall 7b, but may be different angles. Also, different inclination angles α may be set for each convex strip 3.

[0025] There are a plurality of types of width W3 of the top 6 of the protruding strip 3. The width W3 of the top 6 refers to the distance from the left end to the right end of the top 6 in the left-right direction of the building board 1.

[0026] As shown in FIG. 6, the multiple ridges 3 include at least one narrowest ridge 3a having the narrowest width. The width of the narrowest ridge 3a (width W3 of the top 6) is, for example, about 1.0 mm to 20.0 mm, and preferably about 2.0 mm. The narrowest ridge 3a includes a specific narrowest ridge 3b described later. The width of a normal ridge 3 other than the narrowest ridge 3a is not limited, but is, for example, about 1.0 mm to 20.0 mm, and preferably about 2.0 mm.

[0027] 5 and 6, the long groove 2 is formed by a flat bottom surface 4 extending along the vertical direction and both side walls 7 (right side wall 7a and left side wall 7b) of the ridges 3 located on both sides of the bottom surface 4. The long groove 2 has an opening 5 located between the tops 6 of the ridges 3, which is defined by the bottom surface 4 and both side walls 7 of the ridges 3.

[0028] The portion of the protruding strip 3 located at the rightmost side of the design surface 1a adjacent to the right joint portion 14 is the right end joint portion 1b. When the building boards 1 are installed adjacent to each other in the left-right direction, the right end joint portion 1b forms a joint portion with the left side wall 7b of the protruding strip 3 located at the leftmost side of the adjacent building board 1 on the right side. In other words, the right end joint portion 1b forms a groove-like shape similar to the long groove 2 at the left-right joint portion of the building boards 1.

[0029] As shown in FIG. 6, the long groove 2 has a plurality of depths (for example, three depths), including a first long groove 2a with a first depth H1, a second long groove 2b with a second depth H2 deeper than the first depth, and a third long groove 2e with a third depth H3 deeper than the first depth and shallower than the second depth. In this embodiment, the first long groove 2a corresponds to the shallowest long groove with the smallest depth, and the second long groove 2b corresponds to the deepest long groove with the largest depth. The depth of the long groove 2 refers to the distance from the virtual plane P formed by the top 6 of the building board 1 to the bottom surface 4 in the direction from the back surface 50 of the building board 1 to the design surface 1a (front surface). In this embodiment, the long groove 2 has three depths, but may have two or more depths.

[0030] The first depth H1 (minimum depth) of the first long groove 2a is, for example, about 0.5 mm to 2.0 mm, and preferably about 1.5 mm. The second depth H2 (maximum depth) of the second long groove 2b is, for example, about 2.0 mm to 6.5 mm, and preferably about 3.0 mm. The bottom width W4 of the bottom surface 4 of each of the plurality of long grooves 2 is the same, and the deeper the groove, the larger the opening width W5 of the opening 5. The bottom width W4 of the bottom surface 4 is, for example, about 1.0 mm to 20.0 mm, and preferably about 2.0 mm. If the bottom width W4 is 1.0 mm or more, problems such as difficulty in painting the design surface 1a are unlikely to occur. The bottom width of the bottom surface 4 refers to the distance from the left end to the right end of the bottom surface 4 in the left-right direction of the building board 1.

[0031] The distance from the design surface 1a to the right end joint 1b, i.e., the depth H4 of the right end joint 1b, is set to be deeper than the multiple long grooves 2, for example, about 4.0 mm. The depth H4 of the right end joint 1b is set to be 1.0 mm deeper than the second depth H2 of the second long groove 2b. As described above, the deeper the long groove, the larger the width of the convex strip must be, so that the convex strips 3 located at the extreme left and right ends of the design surface 1a are not the narrowest convex strips 3a but normal convex strips 3 (convex strips 3 with a width W3 of the top 6 of the convex strip larger than the narrowest convex strip 3a). In other words, the narrowest convex strips 3a are not arranged at the extreme left and right ends.

[0032] At least one of the narrowest convex ribs 3a is a specific narrowest convex rib 3b. The specific narrowest convex rib 3b is a convex rib 3 in which, when the second long groove 2b (deepest long groove) is adjacent to the first edge 3c, which is one end of both ends of the narrowest convex rib 3a, the first long groove 2a (shallowest long groove) is adjacent to the second edge 3d, which is the opposite end (other end).

[0033] With the above-mentioned configuration, the building board 1 according to the first embodiment has the following actions and effects.

[0034] As shown in Figs. 4 to 6, the building board 1 has a plurality of long grooves 2 with a plurality of different depths, so that a difference in shade occurs for each long groove. Therefore, even if the heights of the tops 6 of the plurality of convex stripes 3 are the same, a visual effect of a surface step can be obtained. Furthermore, the specific narrowest convex stripe 3b is provided between the first long groove 2a (shallowest long groove) with the smallest depth and the second long groove 2b (deepest long groove) with the largest depth. The second long groove 2b with the largest depth casts a solid shadow on the specific narrowest convex stripe 3b, so that the specific narrowest convex stripe 3b can be further emphasized. In other words, a vertically elongated thin rib pattern is expressed, and a high designability can be imparted. The above-mentioned action and effect can be sufficiently obtained even when the long groove 2 has two different depths. When the depth of the long groove 2 is set to three or more types, a plurality of types of shadows are generated on the convex stripe 3, so that a thin rib pattern with a rich variety is expressed, and an even higher designability can be imparted.

[0035] On the other hand, when the deepest long groove is adjacent to the narrowest ridge 3a, the strength of the narrowest ridge 3a is lower than other locations. In contrast, in the configuration of this embodiment, the first long groove 2a with the minimum depth is provided on the other side of the second long groove 2b of the narrowest ridge 3a. That is, it is designated as the specific narrowest ridge 3b. Therefore, the first long groove 2a reinforces the narrowest ridge 3a, and the strength of the narrowest ridge 3a can be prevented from decreasing. Therefore, even if a ridge 3 having a groove as deep as possible and a top 6 as narrow as possible is formed to improve the design of the building board 1, the strength of the building board 1 can be prevented from decreasing. Such a configuration that achieves both design and strength can be advantageously applied, particularly to ceramic building boards.

[0036] As shown in Fig. 6, a pattern 10 including recesses 10a and protrusions 10b is provided on the surface of the multiple protrusions 3. The peaks 6 of the multiple protrusions 3, including the protrusions 10b of the pattern 10, are all the same height. This disperses the light reflection on the surface of the building board 1, or causes a change in the light reflection. This results in a highly designed appearance with a different texture.

[0037] Each of the long grooves 2 has a bottom surface 4 and an opening 5 located on the opposite side of the bottom surface 4 and between the peaks 6 of the ridges 3. Since the bottom width W4 of the bottom surface 4 of each of the long grooves 2 is the same, the deeper the long groove 2, the larger the opening width W5 of the opening 5. This results in different intervals between the multiple ridges 3. This results in a highly aesthetically pleasing exterior with a randomly arranged vertically long thin rib pattern.

[0038] The long grooves 2 may have the same bottom width W4 of the bottom surface 4, or the same opening width W5 of the openings 5. This makes the widths of the long grooves 2 uniform, and produces a visual effect that emphasizes the protrusions 3. This makes it possible to express a more stylish vertically elongated thin rib pattern.

[0039] The plurality of protruding stripes 3 have both side walls 7 with the same inclination angle α with respect to the design surface 1a (front surface). This allows the shadow to look uniform.

[0040] The distance from the design surface 1a to the right end joint 1b, i.e., the depth H4 of the right end joint 1b, is set to, for example, about 4.0 mm, deeper than the multiple long grooves 2. This provides a highly designed appearance in which the fine rib pattern is divided and arranged in a fixed set unit. Note that if the design in which the fine rib pattern is divided and arranged in a fixed set unit is not required, or if there is no particular concern about the width W3 of the top 6 of the narrowest protrusion 3a (it does not matter if it is large), the depth H4 of the right end joint 1b and the second depth H2 of the second long groove 2b may be set to the same value.

[0041] <Second embodiment> Next, a second embodiment of the present invention will be described with reference to Figs. 9 and 10. The building board 1 according to this embodiment is a building board material similar to that of the first embodiment, and is used, for example, as an exterior wall material. As shown in Fig. 9, the building board 1 has a dividing groove 8 that divides the design surface 1a (surface) into a first region 1c and a second region 1d. The dividing groove 8 is a horizontal joint that intersects with the multiple long grooves 2 and extends in the left-right direction. The dividing groove 8 is deeper than the multiple long grooves 2, and is formed to the same depth as the right end joint portion 1b, for example.

[0042] Each of the long grooves 2 has a linear bottom surface 4 with a constant bottom width W4. As shown in Fig. 10, at least one center line 2c of the bottom width W4 of the bottom surface 4 of the long grooves 2 in the first region 1c and one center line 2d of the bottom width W4 of the bottom surface 4 of the long grooves 2 in the second region 1d are not located on the same line. In this embodiment, in more than 70% of all the long grooves 2, these center lines 2c, 2d are not located on the same line. Note that it is also possible to configure all the long grooves 2 so that these center lines 2c, 2d are not located on the same line.

[0043] With the above-mentioned configuration, the building board 1 according to the second embodiment has the following actions and effects in addition to the actions and effects described above in the first embodiment.

[0044] The building board 1 has a dividing groove 8 that intersects the multiple long grooves 2 and is deeper than the multiple long grooves 2, dividing the design surface 1a (surface) into a first region 1c and a second region 1d. This gives the surface of the building board 1, which has a vertically elongated thin rib pattern, a highly designed appearance with a small division feeling.

[0045] Each of the long grooves 2 has a straight bottom surface 4 with a constant bottom width W4. As shown in FIG. 10, the center line 2c of the bottom width W4 of the bottom surface 4 of the long grooves 2 in the first region 1c and the center line 2d of the bottom width W4 of the bottom surface 4 of the long grooves 2 in the second region 1d are not located on the same line in more than 70% of all the long grooves 2. This reduces the proportion of the convex stripes 3 of vertically adjacent building boards 1 that are connected in a straight line, making it difficult for patterns to become peculiar and emphasized on the construction surface. In addition, the surface pattern misalignment between vertically adjacent building boards 1 is less noticeable.

[0046] The center line 2c of the bottom width W4 of the bottom surface 4 of the long grooves 2 in the first region 1c and the center line 2d of the bottom width W4 of the bottom surface 4 of the long grooves 2 in the second region 1d may not all be located on the same line. This further reduces the proportion of the convex stripes 3 of vertically adjacent building boards 1 that are connected in a straight line, making it less likely that a pattern quirk that appears emphasized on the construction surface will occur. In addition, the misalignment of the surface patterns between vertically adjacent building boards 1 will be less noticeable.

[0047] The plurality of long grooves 2 includes a plurality of first long grooves 2a having a first depth H1 and a plurality of second long grooves 2b having a second depth H2 deeper than the first depth. As shown in FIG. 11, the building board 1 may be configured such that the bottom width W41 of the bottom surface 4 of the plurality of first long grooves 2a is different from the bottom width W42 of the bottom surface 4 of the plurality of second long grooves 2b. Alternatively, the first opening width W51 of the opening 5 of the plurality of first long grooves 2a is different from the second opening width W52 of the opening 5 of the plurality of second long grooves 2b. This makes the shapes of the plurality of long grooves 2 different. Therefore, a difference in shading occurs in each long groove, and a highly designed appearance in which the vertically long thin rib pattern is arranged more randomly is obtained.

[0048] The present disclosure is not limited to the appearance and configuration described in the above-described embodiment, and various modifications, additions, and deletions are possible without departing from the spirit and scope of the present disclosure.

[0049] For example, the depth H4 (depth of the end groove) of the right end joint portion 1b of the design surface 1a may be the same depth as the deepest long groove (second long groove 2b) of the multiple long grooves 2, or may be deeper.

[0050] For example, the number of different depths and widths of the long groove 2 formed on the design surface 1a is not limited to the above embodiment and may be increased. In the above embodiment, the long groove 2 has three different depths, but the long groove 2 may have four different depths.

[0051] In the above embodiment, the pattern 10 formed on the top 6 of the protruding strip 3 of the building board 1 can be changed as appropriate. Also, the top 6 may be a flat surface without a pattern.

[0052] In the building board 1 according to the first and second embodiments, the openings 5 ​​of the multiple long grooves 2 may have the same opening width W5. Also, as shown in Fig. 11, the bottom width W41 of the bottom surface 4 of the multiple first long grooves 2a may be different from the bottom width W42 of the bottom surface 4 of the multiple second long grooves 2b. Alternatively, the first opening width W51 of the openings 5 ​​of the multiple first long grooves 2a may be different from the second opening width W52 of the openings 5 ​​of the multiple second long grooves 2b.

[0053] The building board 1 according to the above embodiment has left and right joints 13, 14 at the left and right side ends, and upper and lower joints 15, 16 at the upper and lower ends. That is, the building board 1 has joints on all four sides. However, the joints of the building board are not limited to this, and the present invention can be applied to building boards that have joints only on two sides, the upper and lower ends, or building boards that have no joints.

[0054] The arrangement of the multiple long grooves 2 and multiple convex stripes 3 in the building board 1 according to the above embodiment is merely an example, and the arrangement pattern of the long grooves 2 and convex stripes 3 may be changed as appropriate. Even if the arrangement of the long grooves 2 and convex stripes 3 is changed, the same actions and effects as described above can be obtained, and an appearance with a high design quality can be obtained. In addition, by changing the arrangement of the long grooves 2 and convex stripes 3, multiple pattern patterns of the design surface 1a can be produced.

[0055] In the above embodiment, an example of a ceramic-based exterior wall material made of raw materials such as cement is shown as a building board, but the present invention is not limited to this and can be used for building boards made of other materials. Furthermore, the building board can be used not only as an exterior wall material, but also as a building board material for other purposes such as an interior wall material.

[0056] The size and thickness of the building board are not limited to those in the above embodiment and can be changed as appropriate.

[0057] The surface of the building board may be colored by spray coating, roll coating, inkjet coating, printing coating, or the like. [Explanation of symbols]

[0058] 1 Architectural board 1a Design surface (front surface) 1b Right end joint 1c 1st area 1d 2nd area 2 Nagamizo 2a 1st long groove (shallowest long groove) 2b 2nd long groove (deepest long groove) 2c center line 2d center line 2e 3rd Long Groove 3 Convex stripe 3a Narrowest protrusion 3b Specified narrowest protrusion 3c 1st edge 3d second edge 4 Bottom 5 aperture 6 top 7 side wall 7a Right side wall 7b Left side wall 8 Dividing trench 10 Pattern 10a Recess 10b Convex part 11 Pear-skin pattern 12 Stucco Pattern 13 Left side joint 14 Right side joint 15 Upper joint 16 Lower joint 50 back side P Virtual plane H1 First depth (minimum depth) H2 Second depth (maximum depth) H3 3rd Depth H4 Depth of right end joint W3 Width of top of ridge W4 Bottom width W41 Bottom width W42 bottom width W5 opening width W51 1st opening width W52 2nd opening width α Tilt angle

Claims

1. A plurality of long grooves having a plurality of different depths formed on a surface of a plate-shaped base material; a plurality of protrusions formed on the surface, partitioned by the plurality of long grooves, having apexes of a plurality of different widths and the apexes having the same height; The plurality of ridges include at least one narrowest ridge having a narrowest width, a shallowest long groove having a minimum depth among the plurality of long grooves is adjacent to a first edge that is an end side of at least one specific narrowest protrusion among the narrowest protrusions; A building board, wherein a deepest long groove having the greatest depth among the plurality of long grooves is adjacent to a second edge which is the other end side of the specific narrowest convex strip.

2. The building board according to claim 1 , further comprising a dividing groove that intersects with the plurality of long grooves, is deeper than the plurality of long grooves, and divides the surface into a first region and a second region.

3. Each of the plurality of long grooves has a linear bottom surface with a constant bottom width, The building board of claim 2, wherein the center line of the bottom width of the bottom surface of the plurality of long grooves in the first region and the center line of the bottom width of the bottom surface of the plurality of long grooves in the second region are not located on the same line in more than 70% of all of the long grooves.

4. The building board according to claim 3 , wherein the center lines of the plurality of long grooves in the first region and the center lines of the plurality of long grooves in the second region are not all located on the same line.

5. A pattern including concave and convex portions is provided on the surface of the plurality of convex stripes. The building board according to claim 1 or 2, wherein the tops of the plurality of ridges, including the ridges of the pattern, are all the same height.

6. Each of the plurality of long grooves has a bottom surface and an opening located on the opposite side of the bottom surface and between the apexes of the protrusions, The building board according to claim 1 or 2, wherein the bottom widths of the bottom surfaces of the plurality of long grooves are the same, or the opening widths of the openings are the same.

7. Each of the plurality of long grooves has a bottom surface and an opening located on the opposite side of the bottom surface and between the apexes of the protrusions, The plurality of long grooves include a plurality of first long grooves having a first depth and a plurality of second long grooves having a second depth deeper than the first depth, A building board as described in claim 1 or 2, wherein the bottom width of the bottom surface of the plurality of first long grooves is different from the bottom width of the bottom surface of the plurality of second long grooves, or the first opening width of the openings of the plurality of first long grooves is different from the second opening width of the openings of the plurality of second long grooves.

8. The building board according to claim 1 or 2, wherein the plurality of ridges have opposite side walls having the same inclination angle with respect to the surface.

9. Each of the plurality of long grooves has a bottom surface with a bottom width and an opening located on the opposite side of the bottom surface and between the apexes of the protrusions, The building board according to claim 8 , wherein the bottom widths of the bottom surfaces of the plurality of long grooves are the same.

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