JP2013076278A - Net-like member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a net-like member capable of making moire inconspicuous.SOLUTION: A net-like member 40 having a plurality of opening areas 42 formed therein is formed of a large number of boundary line segments 48 each extending between two branch points 46 and defining opening areas 42. The net-like member 40 includes regions each of which includes at least two of three kinds of opening areas: the opening areas 42 each surrounded by five boundary line segments 48; the opening areas 42 each surrounded by six boundary line segments 48; and the opening areas 42 each surrounded by seven boundary line segments 48. In this case, the shape and area of each of a plurality of opening areas 42 surrounded by the same number of boundary lines among five, six, and seven lines included in the regions is not fixed.

Description

  The present invention relates to a mesh member in which a plurality of opening regions are defined, and more particularly to a mesh member that can effectively suppress the occurrence of moire.

  Conventionally, a screen door is used in order to prevent insects and dust from entering the room without impeding air permeability and translucency inside and outside the room. The screen door includes a mesh member, and a frame member (a kerchief) fixed to the periphery of the mesh member.

  Patent Document 1 discloses, as an example of a mesh door mesh member, a mesh member in which warp yarns extending in the longitudinal direction and weft yarns extending in the lateral direction are woven, thereby defining a large number of meshes (opening regions). Yes. In this case, the warp and the weft are orthogonal to each other, and each opening region has a rectangular or square shape. Moreover, each opening area | region is located in a line with the regular repetition period in both the vertical direction and the horizontal direction.

Japanese Patent Publication No. 60-53156

  In general, it is known that when geometrically regularly distributed lines are overlapped, a striped pattern, that is, moire (pseudo interference fringes) is visually recognized due to the density of the line spacing. Therefore, when the open areas of the mesh member are arranged in a regular repeating cycle as described above, when the mesh member overlaps with a member having other periodicity, such as a ridge, the interference of the periodicity of the both is caused. It is conceivable that moire is visually recognized. Such moire obstructs the field of view of people in and out of the room or gives a visually uncomfortable feeling.

  This invention is made | formed from such a point, and it aims at providing the net-like member which can make a moire inconspicuous.

The mesh member according to the present invention is:
A reticulated member in which a plurality of open areas are defined,
The mesh member is formed from a number of boundary line segments extending between two branch points to define the open region;
The mesh member includes an opening region surrounded by five boundary segments, an opening region surrounded by six boundary segments, and an opening region surrounded by seven boundary segments. Including an area containing at least two types,
It is a mesh member in which the shape or area of the plurality of open regions surrounded by the same number of boundary lines out of 5, 6, or 7 included in the region is not constant.

  In the mesh member according to the present invention, the region may be formed of a pattern having no direction in which the opening regions are regularly arranged.

  In the mesh member according to the present invention, the area may include an opening area surrounded by six boundary lines.

  In the mesh member according to the present invention, the region may include the largest number of opening regions surrounded by six boundary lines.

In the mesh member according to the present invention, if the number of opening regions surrounded by k boundary segments among the opening regions included in the region is N _k ,
N _k ≦ N _k +1 may be satisfied when k is an integer satisfying 3 ≦ k ≦ 5, and N _k ≧ N _k +1 may be satisfied when k is an integer satisfying 6 ≦ k.

  According to the present invention, the mesh member is surrounded by the opening area surrounded by the five boundary lines, the opening area surrounded by the six boundary lines, and the seven boundary lines. A plurality of openings including an area including at least two types of the opening areas and surrounded by the same number of boundary lines of five, six, or seven included in the area The shape or area of the region is not constant. According to such a net-like member, moire can be made extremely inconspicuous.

FIG. 1 is a view for explaining an embodiment of the present invention, and is a view showing a screen door provided with a mesh member and a frame member. FIG. 2 is a view showing a bag as an example of a member combined with a screen door. FIG. 3 is a plan view showing a mesh member of the screen door of FIG. 1, and is a diagram for explaining a pattern of the mesh member. FIG. 4 is a partially enlarged view of FIG. 3 for explaining the pattern of the mesh member. FIG. 5 is a diagram for explaining the maximum branch point interval. FIG. 6 is a graph showing the number of open regions surrounded by each number of boundary line segments. FIG. 7 is a plan view showing a state in which the screen door shown in FIG. 1 and the fence shown in FIG. 2 are overlapped. FIG. 8 is a plan view showing a state in which the fence shown in FIG. 2 is slightly tilted and overlapped with the screen door shown in FIG. FIG. 9 is a diagram for explaining a method of designing the pattern of the mesh member shown in FIG. 3, and is a diagram showing a method for determining a generating point. FIG. 10 is a diagram for explaining a method of designing the pattern of the mesh member shown in FIG. 3, and is a diagram showing a method for determining a generating point. FIG. 11 is a diagram for explaining a method of designing the pattern of the mesh member shown in FIG. 3, and is a diagram showing a method for determining a generating point. 12A to 12D are diagrams showing the determined mother point group in the absolute coordinate system and the relative coordinate system, and are diagrams for explaining the degree of dispersion of the mother point group. FIG. 13 is a diagram for explaining a method of designing the pattern of the mesh member shown in FIG. 3, and is a diagram showing a method of determining a pattern by creating a Voronoi diagram from the determined mother point. . FIG. 14 is a plan view showing a modification of the mesh member. FIG. 15 is a plan view for explaining a pattern of a mesh member according to the first comparative embodiment. 16 is a plan view showing a state in which the ridge shown in FIG. 2 and the net-like member shown in FIG. 15 are overlapped. FIG. 17 is a plan view showing a state in which the ridges shown in FIG. 2 are slightly tilted and overlapped with the mesh member shown in FIG. FIG. 18 is a plan view showing a mesh member according to the second comparative embodiment. FIG. 19 is a plan view showing a mesh member according to a third comparative embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual product. Furthermore, terms used in the present specification for specifying shapes and geometric conditions, for example, terms such as “parallel”, “orthogonal”, “triangle”, “trapezoid” and the like are not restricted to a strict meaning. Therefore, it should be interpreted including an allowable error to the extent that a similar function can be expected.

  The embodiment described below is an example in which the mesh member according to the present invention is applied to a mesh door configured by fixing the mesh member to a frame member. However, the present invention is not limited to this example, and the mesh member according to the present invention is widely applied to other uses such as a mosquito net configured by supporting the mesh member so that a space surrounded by the mesh member is formed. be able to.

  1-13 is a figure for demonstrating one Embodiment by this invention. Among these, FIG. 1 is a figure which shows the screen door provided with the net-like member and the frame member, and FIG. 2 is a figure which shows the collar as an example of the member combined with a screen door. 3 to 5 are diagrams for explaining the mesh member of the screen door, and FIG. 6 is a diagram illustrating the number of boundary lines surrounding the opening region and the boundary line segments of each number for the mesh member shown in FIG. Is a graph showing the relationship between the number of open regions surrounded by. FIG. 7 is a diagram illustrating a state in which a screen door and a ridge are overlapped, and FIG. 8 is a diagram illustrating a modification of FIG. 9-13 is a figure for demonstrating the method of determining the plane pattern of the mesh-like member shown by FIGS. 3-5.

(Screen door)
As shown in FIG. 1, the screen door 30 includes a mesh member 40 in which a plurality of opening regions 42 are defined, and a frame member 35 fixed to the periphery of the mesh member 40 so as to stretch the mesh member 40. ing. As shown in FIG. 1, each opening region 42 of the mesh member 40 is formed as a region surrounded by a line portion 44 extending over the entire surface of the mesh member 40. In general, the screen door 30 is configured by stretching a net-like member 40 on the inner side of the bag, and the screen door 30 is fitted into a window frame, a door frame, or the like located at the boundary between the room and the outdoor. The screen 30 is often opened and closed by sliding between the sill and the duck at the heel part. In addition, as another configuration example (use example), a net-like member 40 may be directly stretched inside a window frame or a door frame without using a scissors (so-called fitting killing). In the present specification, the frame, the window frame, and the door frame are collectively referred to as a frame member 35.
By providing such a screen door 30, insects and dust can be prevented from entering the room from the outside by the line portion 44 of the screen door 30, and the air permeability between the outside and the room by each opening region 42 of the screen door 30. And translucency can be ensured.

  The material constituting the line portion 44 of the mesh member 40 of the screen door 30 is not particularly limited as long as it has strength capable of withstanding the tension by the frame member 35. For example, iron (carbon steel other than pure iron, carbon steel) A metal such as an iron alloy such as polyamide resin (nylon), a resin such as polypropylene, and the like can be used.

(簾)
As shown in FIG. 2, the reed 60 overlapped with the screen door 30 includes a plurality of transverse members 62 arranged in the longitudinal direction at a predetermined repetition pitch Pt, and longitudinal locking members that connect the transverse members 62 to each other. 64. Each of the lateral members 62 is a member extending in the lateral direction and capable of shielding external light, and is made of, for example, bamboo or wood. Further, the longitudinal locking member 64 is made of, for example, a thread.

(Reticulated member)
Next, the mesh member 40 will be further described in detail with reference to FIGS. As shown in FIGS. 3 to 5, the line portion 44 of the mesh member 40 includes a large number of branch points 46. The line portion 44 of the mesh member 40 includes a number of boundary line segments 48 that form branch points 46 at both ends. That is, the line portion 44 of the mesh member 40 is composed of a large number of boundary line segments 48 extending between the two branch points 46. An opening region 42 is defined by connecting the boundary line segment 48 at the branch point 46. In other words, one opening region 42 is defined by being surrounded and divided by the boundary line segment 48.

  One of the main functions of the mesh member 40 is to prevent insects and dust from entering the room from the outside. Therefore, the upper limit of the dimension of each opening area 42 is set based on the viewpoint of sufficiently preventing insects and dust from entering the room from the outside. On the other hand, in the mesh member 40 as described above, air permeability and translucency between the outdoor and the indoor are ensured through the respective opening regions 42. Therefore, the lower limit of the dimension of each opening region 42 is set based on the viewpoint of sufficiently ensuring the air permeability and translucency between the outdoor and the indoor. Further, the line portion 44 prevents insects and dust from entering, but on the other hand, it also inhibits light transmission and air flow. Therefore, the upper limit of the dimension of the line portion 44 is set based on the viewpoint of sufficiently ensuring the air permeability and translucency between the outside and the room. For these reasons, in order to prevent insects and dust from entering the room from the outside by the screen door 30 and to ensure air permeability and translucency between the outside and the room, the line portion 44 and each opening region 42 It can be said that it is important to appropriately set the dimension range (upper limit and lower limit).

  In the present embodiment, in order to appropriately set the size range of the line portion 44 and each opening region 42, the range of the width v of the line portion 44 and the range of the maximum branch point interval U in each opening region 42 are appropriate. The method of setting to is adopted. Among these, the width v of the line portion 44 is such that the line portion 44 in the direction orthogonal to the direction in which the line portion 44 extends along the opening region 42 is shown in the enlarged display surrounded by a round frame in FIG. Means the dimensions. Note that the lower limit of the width v of the line portion 44 is set based on the viewpoint of ensuring the strength of the mesh member 40 appropriately.

The maximum branch point interval U will be described with reference to FIG. In FIG. 5, one opening region 42 made of a hexagon is shown, and six branch points 46 of the opening region 42 are indicated by reference signs P _{1 to} P ₆ . Here, the length of the line segment connecting any two branch points P _x and P _y (x, y = 1 to 6, x ≠ y) among the branch points P _{1 to} P ₆ is determined as a branch point interval uxy. In this case, the maximum branch point interval U is defined as the maximum value in each uxy. In the example shown in FIG. 5, the branch point interval u25, which is the length of the line segment connecting the branch point P2 and the branch point P5, is the maximum value in each xy, and therefore the branch point interval u25 is The maximum branch point interval U is set. The maximum distance U between the branch points is a value representative of the size or dimension of the opening region 42. The maximum branch point distance U corresponds to the maximum diagonal length in the polygon when the opening region 42 is a polygon, and also corresponds to the circumscribed circle diameter when the opening region 42 is a regular polygon. To do.

  As a result of repeated experiments by the present inventors, it is found that the width v of the line portion 44 is set to 50 to 200 μm and the maximum branch point interval U is set to 0.5 to 3 mm. It has been found that it is preferable for preventing intrusion of dust and dust, ensuring air permeability and translucency between the outside and the inside of the room, and ensuring the strength of the mesh member 40 appropriately. Therefore, in the mesh member 40 according to the present embodiment, preferably, the width v of the line portion 44 is set to 50 to 200 μm, and the maximum branch point interval U is set to 0.5 to 3 mm. In general, the pitch Pt in the vertical direction of the horizontal member 62 of the above-described rod 60 is larger than the maximum branch point interval U of the mesh member 40.

The net member 40 as described above can be formed by, for example, the following methods (1) and (2) when the line portion 44 is made of metal. Further, when the line portion 44 is made of resin, the mesh member 40 can be formed by, for example, the following method (3).
(1) A method of laminating a metal foil on an appropriate base film and etching the metal foil into a desired net pattern by a known method. In this case, a resist layer for etching the metal foil into a desired net pattern is provided on the side of the metal foil opposite to the side facing the base film. The metal foil etched into the mesh pattern is peeled from the base film.
(2) A method of preparing a metal foil and etching the metal foil into a desired net pattern by a known method. In this case, resist layers for etching the metal foil into a desired net pattern are provided on both sides of the metal foil.
(3) A resin layer is provided on a suitable substrate, and then the resin layer is punched out using a mold having a desired net pattern. The resin layer punched into the mesh pattern is peeled off from the substrate.

  The mesh member 40 formed as described above is shipped in a state of being wound in a roll shape, for example. Thereafter, the mesh member 40 cut into a desired shape and size is fixed to the frame member 35, whereby the mesh door 30 is formed. The method for fixing the mesh member 40 to the frame member 35 is not particularly limited, and a known method is appropriately used.

  Next, a pattern (plan view pattern) of the mesh member 40 when observed from the normal direction of the mesh member 40 spread in a plane will be described with reference mainly to FIGS. 3, 4, and 13.

  As shown in FIGS. 3, 4, and 13, the line portion 44 of the mesh member 40 includes a large number of boundary line segments 48 that extend between the two branch points 46. An opening region 42 is defined by connecting the boundary line segment 48 at the branch point 46.

  As shown in FIGS. 3, 4, and 13, since the line portion 44 is configured only by the boundary line segment 48, there is no line portion 44 that extends into the opening region 42 and becomes a dead end. In other words, there is no wire projecting from the branch point 46 without being connected anywhere, which may cause poor appearance or destruction. For this reason, the quality and durability of the mesh member 40 can be improved.

  By the way, as described above, when a screen door having a conventional mesh member in which each open region is arranged in a regular repetition period is overlapped on the kite, the stripes caused by interference between the periodicity of the kite and the mesh member -Like patterns, that is, moire (interference fringes) may be visually recognized. If moiré is seen, it will interfere with the visibility of people who are indoors and outdoors.

  Here, FIG. 15 shows a conventional typical mesh member 140 having opening regions 142 formed in a square lattice pattern as a first comparative form. Further, FIG. 16 shows a state in which the screen door 130 having the conventional mesh member 140 shown in FIG. 15 is overlapped with the ridge 60 shown in FIG. Further, FIG. 17 shows a state in which the fence 60 shown in FIG. 2 is slightly tilted and overlapped with the screen door 130 having the conventional mesh member 140 shown in FIG. 16 and 17, only the lateral members 62 periodically arranged in the vertical direction in the rod 60 are shown as lines for convenience of explanation.

  As shown in FIG. 16, when the mesh member 140 formed in a square lattice pattern is overlapped with the ridge 60 having the transverse members 62 periodically arranged in the vertical direction, the regular mesh member is formed. Due to the interference between the (periodic) pattern and the regular (periodic) pattern of the ridge 60, light and dark stripes are visually recognized along the vertical direction. Furthermore, as shown in FIG. 17, when the heel 60 is slightly inclined, the moire can be visually recognized more clearly. Note that slightly tilting the ridge 60 means that the ridge 60 is slightly inclined due to an installation error when the ridge 60 is attached to a door or door, or that the ridge 60 is slightly inclined due to fluctuations caused by the wind. Is assumed.

  On the other hand, in order to prevent the occurrence of moire, the mesh member 40 of the screen door 30 according to the present embodiment has an open region 42 (a straight line segment with a narrow boundary line) surrounded by five boundary line segments 48. In this case, it corresponds to a pentagon), and each includes at least two types of an opening region 42 surrounded by six boundary segments 48 and an opening region 42 surrounded by seven boundary segments 48. It is. In addition, in the mesh member 40 of the screen door 30 according to the present embodiment, a plurality of openings surrounded by the same number of boundary lines 48 out of the five, six, or seven included in the mesh member 40. The shape or area of the region 42 (the area of the portion surrounded by the boundary line segment) is not constant. Here, the shape or area is not constant. (A) When only the shape is not constant (area is constant), (b) Only the area is not constant (shape is constant), (c) Shape and area In the case where both are not constant, it means that either case is applicable. That is, when the mesh member 40 includes a plurality of opening regions 42 surrounded by the five boundary line segments 48, the plurality of opening regions 42 defined by the five boundary line segments 48. When the mesh member 40 includes a plurality of opening regions 42 surrounded by the six boundary line segments 48, at least two of the two boundary line segments 48 have different shapes or areas. At least two of the plurality of defined open areas 42 have different shapes or areas, and the reticulated member 40 includes a plurality of open areas 42 surrounded by seven boundary segments 48. In the case where at least two of the plurality of opening regions 42 defined by the seven boundary line segments 48 have different shapes or areas. More preferably, 50% or more of the plurality of opening regions 42 surrounded by the same number of boundary line segments 48 are configured such that their shapes or areas are different from each other. More preferably, all of the plurality of opening regions 42 surrounded by the same number of boundary line segments 48 are configured to have different shapes or areas. In addition, when two (or more) congruent opening regions 42 have different directions, the shapes of these opening regions 42 are treated as different from each other. According to such an aspect, the pattern of the mesh member 40 can be effectively irregularized.

  As a result of intensive research, the inventors of the present invention do not simply make the pattern of the mesh member 40 irregular, but rather open regions 42 and 6 boundaries surrounded by five boundary segments 48. At least two types of the opening region 42 surrounded by the line segment 48 and the opening region 42 surrounded by the seven boundary line segments 48 are respectively included in the mesh member 40, and the mesh member 40 The pattern of the mesh member 40 is defined so that the shape or area of the plurality of opening regions 42 surrounded by the same number of boundary line segments 48 out of the five, six, or seven included in FIG. It has been found that the moire that can occur when the screen door 30 provided with the net-like member 40 and the ridge 60 overlap can be made inconspicuous very effectively.

  Generally, it is considered that making the pattern of the mesh member 40 irregular is effective for making the moire invisible. However, according to the studies by the present inventors, even if the pattern shape and arrangement pitch of the mesh member 40 are simply made irregular, moire cannot always be made sufficiently inconspicuous.

  For example, the mesh member 140A according to the second comparative embodiment shown in FIG. 18 does not have a periodicity in the horizontal direction (the left-right direction in the figure) in the two-dimensional plane composed of the vertical direction and the horizontal direction. As a result, the entire two-dimensional plane does not have a complete repetition cycle and can be visually recognized as an indefinite pattern. That is, by making the shape or the arrangement pitch of the opening area partially irregular, the repetition regularity of the arrangement of the opening area can be specified by the same shape of the opening area 142 at a constant repetition pitch vertically and horizontally. Compared with the square lattice arrangement of FIG. 15 arranged in the linear direction, the mesh member 140A itself can be visually recognized as an irregular pattern as a whole. However, with the net-like member 140A that is visually recognized as the irregular pattern, the moiré cannot be perceived to the extent that it cannot be perceived. The reason why the moire cannot be made inconspicuous effectively is thought to be because it still has a repetition cycle in the vertical direction. That is, if a partial periodicity remains in any direction in the two-dimensional plane even partially, it is considered that moire occurs due to the residual periodicity.

  Further, like the mesh member 140B according to the third comparative embodiment shown in FIG. 19, if each opening region has a completely irregular pattern in both the vertical direction and the horizontal direction in the two-dimensional plane, it does not have a repeating periodicity. It is also possible to eliminate moire. However, when such a completely irregular pattern is adopted, a new problem occurs. That is because the variation in the shape and area of each opening region is large, so that an opening region having a maximum branch point interval larger than that of the expected insects and dusts is partially generated, and as a result, through the opening region. Insects and dust enter the room from the outside. This is a drawback when the mesh member 40 is used for insect repellent applications. Further, as can be seen from FIG. 19, due to the distribution of the shape (or area) of the opening region, that is, the non-transparent unevenness, the disadvantage that unevenness of light and dark or light and shade appears in the landscape seen through the mesh member 140B is also manifested. . In addition to this, as a result of the line portions constituting the mesh member 140B being randomly arranged, a portion where the tip of the line portion exists without being connected to other line portions is generated. As a result, the quality and durability of the mesh member 140B are deteriorated.

On the other hand, when the pattern included in the mesh member 40 satisfies both of the following conditions (A) and (B) like the planar pattern of the mesh member 40 according to the present embodiment described here, In the pattern, it is possible to effectively prevent the occurrence of moire, and the shape and area of each opening region is prevented from excessively varying to such an extent that the unevenness can be visually recognized in the transparent scenery. It became possible.
Condition (A): An opening region 42 surrounded by five boundary line segments 48, an opening region 42 surrounded by six boundary line segments 48, and seven boundary line segments 48. A plurality of at least two types of the surrounded open areas 42 are included.
Condition (B): The shape or area of the plurality of opening regions 42 surrounded by the same number of boundary lines 48 out of 5, 6, or 7 is not constant. That is, when a plurality of opening regions 42 surrounded by the five boundary line segments 48 are included, at least two of the plurality of opening regions 42 defined by the five boundary line segments 48 are included. Are defined by the six boundary line segments 48 when they have different shapes or areas and include a plurality of open regions 42 surrounded by the six boundary line segments 48. When at least two of the plurality of open regions 42 have different shapes or areas and include a plurality of open regions 42 surrounded by seven boundary segments 48, the seven open regions 42 are included. At least two of the plurality of opening regions 42 defined by the boundary line segment 48 have different shapes or areas.

  The effects achieved by the mesh member 40 satisfying the conditions (A) and (B) exceed the range that can be predicted in light of the conventional state of the art that has simply implemented pattern irregularity as an invisible moire pattern. It can be said that this is a remarkable effect. The details of the reason why such a function and effect can be obtained by the mesh member 40 satisfying the conditions (A) and (B) are unknown, but the following is presumed to be the reason. The However, the present invention is not limited to the following estimation.

  First, according to the condition (A), the arrangement of the opening regions 42 is an arrangement in which regularity of the shape and arrangement of each unit area is broken from a honeycomb arrangement in which regular hexagons having the same shape are regularly arranged, in other words, And, the arrangement and the arrangement of each unit region can be randomized with reference to the honeycomb arrangement. As a result, it is possible to suppress the occurrence of clear roughness in the arrangement of the opening regions 42, and it is estimated that a large number of the opening regions 42 can be distributed with a substantially uniform density, that is, with a substantially uniform distribution. The In addition, according to the condition (B), it is possible to sufficiently randomize the arrangement of the many opening regions 42. From these facts, it is presumed that it is possible to effectively suppress both the variation of the area of the opening region 42 or the variation in the maximum branch point interval and the occurrence of moire.

  As a result of actual diligent investigations by the present inventors, the arrangement of the open regions 42 was sufficiently randomized when the conditions (A) and (B) were satisfied. Furthermore, when the conditions (A) and (B) are satisfied, the arrangement of the opening regions 42 can be completely irregular, that is, there can be no direction in which the opening regions 42 are regularly arranged. As a result, it has been confirmed that it is possible to effectively suppress both the variation of the area of the opening region 42 or the variation in the maximum branch point interval and the occurrence of moire.

Here, FIG. 4 is a plan view for explaining a state in which there is no direction in which the opening regions 42 are regularly arranged, in other words, a state in which there is no direction in which the opening regions 42 are arranged with regularity. It is. In FIG. 4, on the mesh member 40 widened in a planar manner, virtual straight line d _i of one facing any direction is selected at an arbitrary position. This single line d _i intersects with the boundary line segment 48 of the line portion 44 to form an intersection. The intersections are shown as intersections C ₁ , C ₂ , C ₃ ,..., C _{9 in} order from the lower left side of the drawing. Adjacent intersections, for example, the distance between the intersection C ₁ and the intersection C ₂ is the is the dimension T ₁ of the on linear d _i of one opening region 42 certain. Next, another opening region 42 adjacent along the straight line d _i with respect to the opening area 42 with dimensions T ₁ likewise, is determined dimension T ₂ of the on linear d _i. Then, the linear d _i any direction at any position, from the boundary line 48. intersecting the straight line d _i, for a number of opening regions 42 to encounter any direction of linear d _i at an arbitrary position, on the straight line d _i T ₁ , T ₂ , T ₃ ,..., T ₈ are determined. And the arrangement of the numerical values of T ₁ , T ₂ , T ₃ ,..., T ₈ has no periodicity (regularity). That is, the opening regions 42 are arranged so as not to have regularity along the linear direction d _i ,
T _k ≠ T _{k + 1} (k: arbitrary natural number, l: arbitrary natural number) Conditional expression (x)
It comes to satisfy. In FIG. 4, the _{T 1, T 2, T 3} , ······, T 8 is the drawing down as easily understandable, there drawn separately from the mesh member 40 with the straight line _{d i} .

The dimensional T ₁ of the this linearly d _i a is rotated by an arbitrary angle from those shown in Figure 4 another linear d _{i + l} direction for each opening area _A, T _2, when seeking ..., also in FIG. 4 As in the case shown in the figure, the conditional expression (x) is also satisfied in the direction of the straight line d _{i + 1} , and no periodicity (regularity) is observed in the dimensions T ₁ , T ₂ ,. . Thus, when the opening region 42 satisfies the conditional expression (x) in any direction, there is no direction in which the opening region is regularly arranged, or there is a direction in which the opening region 42 has a repeating cycle. Or the arrangement of the open regions is not regular.

Moreover, when the present inventors investigated about the pattern of the various mesh members 40, when the following conditions (C) are further satisfied in addition to the conditions (A) and (B), the condition (C ) And (D) were further satisfied, it was possible to further suppress both the area of the opening region 42 or the variation in the maximum branch point interval and the occurrence of moire. Further, in addition to the conditions (A) and (B), when the following conditions (C), (D) and (E) are further satisfied, the variation of the area of the opening region 42 or the maximum branch point interval and Both occurrences of moire could be further suppressed. Such a tendency agrees with the above estimation and can be said to be a phenomenon that supports the above estimation.
Condition (C): A plurality of opening regions 42 surrounded by six boundary line segments 48 are included.
Condition (D): The opening region 42 surrounded by the six boundary line segments 48 is most often included. That is, the opening area 42 surrounded by the six boundary line segments 48 is included more than the opening area 42 surrounded by the other boundary line segments 48.
Condition (E): Let N _{k be} the number of open regions 42 surrounded by k boundary line segments 48 (in the case where the boundary line segment 48 is a narrow line segment, this corresponds to a k-gon).
When k is an integer satisfying 3 ≦ k ≦ 5, N _k ≦ N _{k + 1}
When k is an integer satisfying 6 ≦ k, N _k ≧ N _{k + 1}
It has become. That is, the largest number of the opening regions 42 surrounded by the six boundary line segments 48 are included, and as the number of the boundary line segments 48 surrounding the opening region 42 increases from six, the opening region 42 As the number of boundary line segments 48 surrounding the region decreases from six, the number of open regions 42 decreases.

  Strictly speaking, whether or not the conditions (A) to (E) are satisfied is examined for all the open regions 42 included in the mesh member 40. However, in practice, the overall tendency of the number of boundary line segments 48 surrounding one opening region 42 in consideration of the size of each opening region 42 defined by the line portion 44 and the like. A boundary that surrounds the opening region 42 included in one section having an area that can be reflected (for example, in the case of the mesh member 40 in which the opening region 42 is formed in the dimension example described above, a portion of 30 mm × 30 mm). The number of line segments 48 may be investigated to determine whether or not each condition (A) to (E) is satisfied. Similarly, as to whether or not the opening area is in a regularly arranged direction, strictly speaking, the arrangement of the opening areas 42 in an arbitrary direction is investigated in the entire area of the target mesh member 40. Become. However, in practice, a section having an area expected to reflect the overall tendency of the arrangement of the opening regions 42 (for example, in the mesh member 40 in which the opening regions 42 are formed in the above-described dimension example). Is the arrangement of the opening regions 42 in each direction passing through the center of the 30 mm × 30 mm portion (for example, in the mesh member 40 in which the opening regions 42 are formed in the above-described dimension example, the direction is every 15 °). It is sufficient to determine whether or not the opening regions exist in a regularly arranged direction.

  Actually, when the mesh member 40 of the screen door 30 shown in FIG. 3 was investigated, as shown in FIG. 12, the mesh member 40 has four, five, six, seven, eight, nine, 79, 1141, 2,382, 927, 94, and 8 open regions 42 surrounded by the boundary line 48 of the book were included, respectively. Further, the mesh member 40 did not include the opening region surrounded by three boundary line segments and the opening region 42 surrounded by ten or more boundary line segments 48. That is, the mesh member 40 shown in FIG. 3 satisfies the conditions (C), (D), and (E) in addition to the conditions (A) and (B).

  FIG. 7 shows a state in which the screen door 30 having the mesh member 40 shown in FIG. 3 is overlapped with the ridge 60 shown in FIG. Further, FIG. 8 shows a state in which the fence 60 shown in FIG. 2 is slightly tilted and overlapped with the screen door 30 having the mesh member 40 shown in FIG. 7 and 8, only the lateral members 62 periodically arranged in the vertical direction in the rod 60 are shown as lines for convenience of explanation.

  As can be understood from FIG. 7, when the mesh member 40 shown in FIG. 3 is actually manufactured to form a combined body in which the screen door 30 provided with the mesh member 40 and the basket 60 are overlapped, A striped pattern that can be visually recognized, that is, moire (interference fringes) did not occur on the body. Further, as can be understood from FIG. 8, moire did not occur even when the ridge 60 was slightly tilted and overlapped with the screen door 30. Such an effect of the mesh member 40 of the screen door 30 is a remarkable effect that exceeds the range expected from the prior art.

  Here, an example of a method for producing the pattern of the line portion 44 of the mesh member 40 that satisfies the above-described conditions (A) and (B) will be described.

  The method described below includes a step of determining a generating point, a step of creating a Voronoi diagram from the determined generating point, and a boundary segment extending between two Voronoi points connected by one Voronoi boundary in the Voronoi diagram. And determining the pattern of the mesh member 40 (line portion 44) by determining the thickness of the determined path and demarcating each boundary line segment. Hereinafter, each step will be described in order. Note that the pattern shown in FIG. 3 described above is a pattern actually determined by the method described below.

  First, the process of determining a generating point will be described. First, as shown in FIG. 9, a first generating point (hereinafter referred to as “first generating point”) BP1 is arranged at an arbitrary position in the absolute coordinate system XY. The absolute coordinate system referred to here is a normal two-dimensional space (plane), but is particularly called an absolute coordinate system in order to distinguish it from a relative coordinate system described later. Next, as shown in FIG. 10, the second generating point BP2 is arranged at an arbitrary position away from the first generating point BP1 by the distance r1 or more and the distance r2 or less. That is, the circumference of the radius r1 located on the absolute coordinate system XY around the first generating point BP1, the circumference of the radius r2 located on the absolute coordinate system XY around the first generating point BP1, The second generating point BP2 is arranged in a circumferential region surrounded by. Here, the distance r1 is smaller than the distance r2 (r1 <r2), and when producing the mesh member 40 shown in FIG. 3, the distance r1 was 480 μm and the distance r2 was 570 μm.

  Next, as shown in FIG. 11, the third mother point BP1 is separated from the first mother point BP1 by a distance r1 or more and a distance r2 or less, and is further separated from the second mother point BP2 by a distance r1 or more. Point BP3 is arranged. Thereafter, the fourth generating point is arranged at an arbitrary position away from the first generating point BP1 by the distance r1 or more and the distance r2 or less and further from the other generating points BP2 and BP3 by the distance r1 or more. In this way, until the next generating point cannot be arranged, it is separated from the first generating point BP1 by the distance r1 or more and the distance r2 or less, and in addition, the distance from the other generating points BP2, BP3,. The mother point is arranged at an arbitrary position separated by r1 or more. That is, the circumference of the radius r1 located on the absolute coordinate system XY around the first generating point BP1, the circumference of the radius r2 located on the absolute coordinate system XY around the first generating point BP1, The mother points are arranged until there are no positions apart from the mother points except for the first mother point BP1 by the distance r1 or more in the circumferential region surrounded by.

  Thereafter, this operation is continued based on the second generating point BP2. That is, it is separated from the second generating point BP2 by a distance r1 or more and a distance r2 or less, and further at an arbitrary position distant from the other generating points BP1, BP3, BP4,. Place the mother point. With reference to the second generating point BP2, until the next generating point cannot be arranged, that is, with the circumference of the radius r1 positioned on the absolute coordinate system XY with the second generating point BP2 as the center, In a circumferential area surrounded by the circumference of the radius r2 located on the absolute coordinate system XY with the second generating point BP2 as the center, the distance r1 or more from all generating points other than the second generating point BP2 The mother point is arranged until there is no remote position. Thereafter, the base point as a reference is sequentially changed, and the base point is formed in the same procedure.

  With the above procedure, the mother point is arranged until the mother point cannot be arranged in the region where the mesh member 40 is to be formed. When the generating point cannot be arranged in the region where the mesh member 40 is to be formed, the step of generating the generating point is completed. By the processing so far, the generating point groups irregularly arranged in the two-dimensional plane (XY plane) are uniformly dispersed in the region where the mesh member 40 is to be formed.

With respect to the generating point groups BP1, BP2,..., BP6 (see FIG. 12A) distributed in the two-dimensional plane (XY plane) in such a process, the distance between the generating points is not constant. Have a distribution. However, the range between any distribution completely random distribution of distances between two adjacent base points (uniformly distributed) but without the upper limit value R _MAX and the lower limit value R _MIN across the mean value R _AVG [Delta] R = It is distributed in R _MAX -R _MIN . Here, regarding two adjacent generating points, when a Voronoi diagram is created as described later from the generating point groups BP1, BP2,... It is defined that the generating points located in the two Voronoi regions XA are adjacent to each other. In FIG. 12A, a Voronoi boundary (see FIG. 13) obtained from these generating point groups is shown by a broken line for reference.

That is, with respect to the generating point group described here, a coordinate system having each generating point as an origin (referred to as a relative coordinate system oxy), on the other hand, an actual two-dimensional plane (coordinate system) is absolute as described above. 12 (B), FIG. 12 (C),... In which all the generating points adjacent to the generating point placed on the origin are plotted on the coordinate system O-XY). Find the mother point. Then, when the graphs of the adjacent generating points on all the relative coordinate systems are displayed with the origin o of each relative coordinate system superimposed, a graph as shown in FIG. 12D is obtained. The distribution pattern of adjacent mother point groups on such a relative coordinate system is such that the distance between any two adjacent mother points constituting the mother point group is not a uniform distribution from 0 to infinity, but more than zero. It is distributed within a finite range from a large (R _AVG -ΔR) to (R _AVG + ΔR) (a donut-shaped region from a radius R _MIN to R _MAX ). As can be seen from FIG. 12D, the distribution of other generating points as seen from any one generating point is isotropic to substantially isotropic. Correspondingly, the pattern of the mesh member 40 obtained as a Voronoi diagram created based on the generating point group as will be described later is also isotropic to substantially isotropic.

Thus, by setting the distance between each generating point, the Voronoi area XA obtained from the generating point group by the method described below, and the circumscribed circle diameter (or the opening area) of the opening area 42 obtained therefrom are used. Also, the distribution of the area is not a uniform distribution (completely random) but a distribution within a finite range. By comprising in this way, air permeability and translucency surface distribution at the time of visually observing the pattern of the mesh member 40 become more uniform. In order to make the non-permeability of air permeability and translucency substantially unrecognizable or visually invisible, and also compatible with the anti-moire due to the non-periodicity of the pattern of the mesh member 40, the size of the opening region 42, that is, the maximum branch point When the maximum value of the interval U is U _MAX and the minimum value is U _MIN , the distribution range ΔU of the maximum branch point interval U is larger than the average value U _AVE of the maximum branch point interval U.
0.1 ≦ ΔU / U _AVE ≦ 0.6... Conditional expression (y1)
More preferably 0.2 ≦ ΔU / U _AVE ≦ 0.4... Conditional expression (y2)
And When the present inventors formed various patterns and tried them, when the conditional expression (y1) is satisfied, in the normal observation ability, the air permeability and translucency are not felt, and the condition (y2 ), The air permeability and translucency were not felt even when observed carefully.

In the above-described step of determining the generating point, by changing the size of the distance r1, it is possible to adjust the size of the U _{AVE and} the opening area 42 per one. Specifically, by reducing the size of the distance r1, it is possible to reduce the size of U _{AVE and} the opening area 42 per one, and conversely, by increasing the size of the distance r1, U U The average size of the _{AVE, that} is, the opening area 42 can be increased. Further, by changing the difference between the distance r1 and the distance r2, and further changing the distribution range ΔU of the maximum branch point interval U, the size of the range in which the distance between two adjacent mother points is dispersed (in FIG. 12D). (The magnitude of ΔR) can be changed. Specifically, by reducing the difference between the distance r1 and the distance r2, the variation in the distance between two adjacent generating points tends to be reduced.

  Next, as shown in FIG. 13, a Voronoi diagram is created on the basis of the arranged generating points. As shown in FIG. 13, a Voronoi diagram is configured by dividing a vertical bisector between two adjacent generating points and connecting them with intersections of the vertical bisectors. FIG. Here, the line segment of the perpendicular bisector is called a Voronoi boundary XB, the intersection of the Voronoi boundaries XB forming the ends of the Voronoi boundary XB is called a Voronoi point XP, and a region surrounded by the Voronoi boundary XB is a Voronoi region Called XA.

  In the Voronoi diagram created as shown in FIG. 13, each Voronoi point XP forms a branch point 46 of the mesh member 40. Then, one boundary line segment 48 is provided between two Voronoi points XP forming the end of one Voronoi boundary XB. At this time, the boundary line segment 48 may be determined so as to extend linearly between the two Voronoi points XP as in the example shown in FIG. Various paths (for example, circle (arc), ellipse (arc), fence line, hyperbola, sine curve, hyperbolic sine curve, elliptic function curve, Bessel function curve, etc.) between the two Voronoi points XP without It may be extended by a broken line or the like. In addition, as in the example illustrated in FIG. 3, when the boundary line segment 48 is determined to connect the Voronoi points XP in a straight line, each Voronoi boundary XB defines the boundary line segment 48. become.

By defining each boundary line segment 48 in this way, the maximum branch point interval U is not a completely random distribution (uniform distribution) but an average value, as in the case of the distance between the two generating points. It can be distributed in the range ΔU = U _MAX −U _MIN between the upper limit value U _MAX and the lower limit value U _MIN across the U _AVG . That is, the variation in the maximum branch point interval U in each opening region 42 can be reduced. Accordingly, the maximum branch point interval U in each opening region 42 is an appropriate range for ensuring air permeability and translucency between the outdoor and indoors and preventing insects and dust from entering from the outdoor to the indoors. Comes in securely. Thereby, the air permeability and translucency between the outdoor and indoor areas by each opening region 42 can be ensured uniformly over the entire area of the mesh member 40. That is, unevenness in air permeability and translucency can be prevented. In addition, it is possible to reliably prevent insects and dust from entering the room from the outside over the entire area of the mesh member 40.

  After determining the path of each boundary line segment 48, the line width (thickness) of each boundary line segment 48 is determined. The line width of the boundary line segment 48 is within the range of the width v of the above-described line portion 44 so as to ensure air permeability and translucency between the outdoor and indoor spaces and to ensure the strength of the mesh member 40 appropriately. Set by.

  According to the present embodiment as described above, the mesh member 40 of the screen door 30 is formed from a large number of boundary line segments 48 extending between the two branch points 46 and defining the opening region 42. The opening region 42 surrounded by the boundary line segments 48, the opening region 42 surrounded by the six boundary line segments 48, and the opening region 42 surrounded by the seven boundary segment segments 48. A plurality of open regions that are included in the mesh member 40 and that are surrounded by the same number of boundary line segments 48 out of the five, six, or seven included in the mesh member 40. The shape or area of 42 is not constant. As a result, when the screen door 30 is overlapped on the reed 60 in which the transverse members 62 are regularly (periodically) arranged in the vertical direction, a striped pattern (moire, interference fringes) and air permeability and translucency are obtained. It can prevent effectively that a nonuniformity generate | occur | produces to such an extent that it can be visually recognized.

  Note that various modifications can be made to the above-described embodiment.

  For example, in the above-described embodiment, the example in which the boundary line segment 48 of the mesh member 40 is formed in a straight line is shown, but the present invention is not limited to this. As described above, the boundary line segment 48 may extend between the two branch points 46 along various paths such as a curved line.

  Furthermore, the pattern design method for the mesh member 40 described above is merely an example. For example, the mother point may be arranged in the following procedure. First, as in FIG. 9, the first generating point BP1 is arranged at an arbitrary position in the absolute coordinate system XY. Next, the second generating point BP2 is arranged at an arbitrary position separated from the first generating point BP1 by the distance r. Thereafter, the third mother point BP3 is arranged at an arbitrary position separated from the first mother point BP1 by the distance r and further away from the second mother point BP2 by the distance r or more. Thereafter, the next mother point is sequentially placed at an arbitrary position away from the first mother point BP1 by the distance r and at any position away from all the mother points BP2 and BP3 other than the first mother point BP1 already arranged by the distance r. Place it. If it becomes impossible to arrange the mother point at the position separated from the first mother point BP1 by the distance r by the above procedure, then the second mother point is separated from the second mother point by the distance r and is already arranged. The next generating points are arranged in order at an arbitrary position at a distance r or more from all generating points other than the generating point BP2. In this way, with the second generating point BP2 as a reference, the generating point is arranged until the next generating point cannot be arranged. Thereafter, the base point as a reference is sequentially changed, and the base point is formed in the same procedure. With the above procedure, the mother point is arranged until the mother point cannot be arranged in the region where the mesh member 40 is to be formed. When the generating point cannot be arranged in the region where the mesh member 40 is to be formed, the step of generating the generating point is completed. Even with such a process, the irregularly arranged generating point groups can be uniformly dispersed in the region where the mesh member 40 is to be formed.

  Furthermore, the mother point can be arranged in the following procedure. First, as in FIG. 9, the first generating point BP1 is arranged at an arbitrary position in the absolute coordinate system XY. Next, the second generating point BP2 is arranged at an arbitrary position away from the first generating point BP1 by a distance r or more. Thereafter, the third generating point BP3 is arranged at an arbitrary position away from each of the first generating point BP1 and the second generating point BP2 by a distance r or more. Thereafter, the next mother point is sequentially arranged at an arbitrary position separated from the already arranged mother points by a distance r or more. With the above procedure, the mother point is arranged until the mother point cannot be arranged in the region where the mesh member 40 is to be formed. When the generating point cannot be arranged in the region where the mesh member 40 is to be formed, the step of generating the generating point is completed. Even with such a process, the irregularly arranged generating point groups can be uniformly dispersed in the region where the mesh member 40 is to be formed.

  Furthermore, in the pattern design method for the mesh member 40 described above, an example is shown in which a specific generating point is first drawn in a plane, and then the pattern of the mesh member 40 is formed as a Voronoi division pattern of the generating point. However, it is not limited to this. For example, by manually drawing pentagonal and hexagonal opening regions 42 having different sizes and shapes in a plane, each of them is randomly drawn without any repetition cycle in any direction. The pattern of the mesh member 40 may be drawn by drawing while paying attention to the size (area or circumscribed circle diameter) of the square and hexagon within a predetermined range.

  Furthermore, in embodiment mentioned above, in the whole area | region of the net-like member 40 of the screen door 30, conditions (A) and (B) mentioned above and also conditions (C)-(E) are satisfy | filled. An example in which there is no direction in which the opening regions 42 are arranged with periodicity over the entire region of the 30 mesh members 40 is shown. However, the conditions (A) and (B) may be satisfied within a partial region included in the mesh member 40 of the screen door 30.

  As typical modifications, a region that satisfies the above-described conditions (A) and (B), preferably a region that satisfies the above-described conditions (A) to (E), and further, the above-described conditions (A) to (E) And a region (unit mesh region) S in which the opening region 42 is regularly arranged and does not have a direction is prepared, and the entire region of the mesh member 40 is configured by collecting a plurality of the regions S. Also good. That is, in this embodiment, two or more unit mesh regions S in which the opening region groups 42 are arranged in the same pattern are included in the entire region of the mesh member 40. In this example, the pattern of the mesh member 40 in one region S can be created, for example, in the same manner as the pattern creation method described with reference to FIGS. It can be created in the same manner as the pattern creation method. This is preferable in that the pattern creation of the mesh member 40 having a large area can be greatly facilitated.

  In the example shown in FIG. 14, the mesh member 40 is divided into six unit mesh regions S having the same shape, and the unit mesh members 40 ′ are configured to be the same in each region S. . The six regions S are arranged so that three regions are arranged in the vertical direction of FIG. 14 and two regions are arranged in the horizontal direction of FIG.

  In such a modification, for example, as shown in FIG. 14, the range in which the opening regions 42 are arranged in a fixed arrangement in the mesh member 40 is the number of unit mesh regions S and the arrangement direction of the regions. Repeatedly exist in parallel directions. That is, in the mesh member 40, there is a linear direction in which a plurality of opening regions 42 are repeatedly arranged with a predetermined regularity. In this case, due to the regular arrangement of the regions S, there is a concern that a striped pattern (moire, interference fringes) or air permeability or translucency unevenness may occur. For this reason, the number of the opening areas 42 included in the unit mesh area S is preferably as large as possible in order to make it difficult to visually recognize the repetition of the unit mesh area S.

  However, if the repetition of the same unit mesh region S in a specific direction is suppressed to a certain extent, such a striped pattern, air permeability and light transmission unevenness can be ignored. This is because, in addition to the small number of repetitions, the size of the region S is significantly different from the size of the repeating unit (repetition period) of the member used by being overlapped with the mesh member 40 such as a ridge. It also exists to deviate from the relationship that produces Specifically, as shown in FIG. 14, when a plurality of unit regions S are arranged in a certain direction with a predetermined pitch SP1, SP2, the predetermined pitch SP1, SP2 is along a certain direction. It is preferable that it is 1/4 or more of the dimensions L1 and L2 of the entire mesh member 40. In addition, the number of opening regions 42 included in the unit mesh region S is preferably 500 or more.

  However, the modification processing of the seam at the boundary between adjacent unit mesh regions (pattern deformation and modification processing for making the seam inconspicuous), and the shape of the unit mesh region (in FIG. 14, a rectangle is used, but other 3 Square, hexagonal, and other shapes are also possible), arrangement style (in Fig. 14, rectangular unit mesh areas are arranged vertically and horizontally on the grid, but even if the unit mesh area is rectangular, this is bricked Depending on how the device is arranged, the vertical and horizontal arrangement pitches SP1 and SP2 of the unit mesh region S are 1/10 or more of the overall dimensions L1 and L2 of the mesh member 40. It has been found that striped patterns, air permeability and translucency unevenness can be made sufficiently inconspicuous.

  In addition, by creating a planar pattern of the mesh member 40 so that the above conditions (A) and (B) are satisfied, the occurrence of moire can be effectively prevented and the shape and area of each opening region can vary. Although the example which can be suppressed was shown, it is not restricted to this. As a result of extensive investigations by the present inventors, the creation of a planar pattern of the mesh member 40 based on other conditions effectively prevents the occurrence of moiré, and the shape and area of each open region varies. It was found that this can be suppressed. Hereinafter, other conditions will be described.

  As a result of extensive investigations by the present inventors, the average number of boundary line segments 48 extending from one branch point 46 is 3 in order to make both air permeability and translucency unevenness and moire more inconspicuous. It was found that it is effective to set the ratio to 0.0 or more and less than 4.0. When the average number of boundary line segments 48 extending from one branch point 46 is 3.0 or more and less than 4.0, from a honeycomb arrangement in which regular hexagons of the same shape are regularly arranged, or From the square lattice arrangement in which squares are regularly arranged, an arrangement in which the regularity of the shape and arrangement of each opening region 42 is broken, in other words, the shape and arrangement of each opening region 42 on the basis of the honeycomb arrangement or the square lattice arrangement. Can be a randomized sequence. Hereinafter, the condition that the average of the number of boundary line segments 48 extending from one branch point 46 is 3.0 or more and less than 4.0 will be referred to as condition (F). By satisfying the condition (F), it is possible to suppress the occurrence of apparent density in the arrangement of the opening regions 42, and to distribute the large number of opening regions 42 with a substantially uniform density, that is, with a substantially uniform distribution. It is speculated that it can be done. Actually, as a result of extensive research conducted by the present inventors, when the average number of boundary line segments 48 extending from one branch point 46 is 3.0 or more and less than 4.0, the arrangement of the open regions 42 is changed. It is possible to stably make the direction in which the opening regions 42 are arranged with repeating regularity (periodicity) non-existent, and as a result, moire is very inconspicuous. It was confirmed that it would be possible. In addition, when the pattern of the mesh member 40 satisfies the above conditions (A) to (E) and further satisfies the condition (F), both the moire elimination effect and the translucency unevenness elimination effect can be achieved. It has been found to be even better. Actually, when the mesh member 40 shown in FIG. 3 was examined, the average number of branches of the boundary line segment 48 at one branch point was 3.04, which was larger than 3 and not larger than 3.1. The condition (F) was also satisfied.

  The average number of boundary line segments 48 extending from one branch point 46 is strictly determined by examining the number of boundary line segments 48 extending for all branch points 46 included in the mesh member 40. The average value is calculated. However, in practice, the boundary extending from one branch point 46 in consideration of the size of the opening area 42 per line defined by the line portion 44 and the like. A section having an area expected to reflect the overall tendency of the number of line segments 48 (for example, in the mesh member 40 in which the opening region 42 is formed in the above-described dimension example, a portion of 30 mm × 30 mm) ) To determine the average value of the number of boundary line segments 48 that extend from the branch point 46 included in (), and calculate the average value of the boundary line segments 78 that extend from one branch point 46 for the mesh member 40. Take as an average number It may be dealing with.

  As an example of a method for producing the pattern of the mesh member 40 so as to satisfy the condition (F), there is a pattern production method by the method shown in FIGS. 9 to 13 described above. That is, according to the pattern manufacturing method by the method shown in FIG. 9 to FIG. 13, the line portion 44 of the mesh member 40 that satisfies the above-described conditions (A) and (B) and the above-described condition (F). A pattern can be produced. Therefore, the mesh member 40 shown in FIG. 3 satisfies the above-described conditions (A) and (B) and also satisfies the above-described condition (F).

  Further, when the mesh member 40 satisfying the above condition (F) is overlapped with the ridge 60 shown in FIG. 2, as shown in FIGS. 7 and 8, a striped pattern (moire, interference fringe) or air permeability or Occurrence of light-transmitting unevenness can be more effectively prevented.

  As an example satisfying the condition (F), an example in which the average number of boundary line segments 48 extending from one branch point 46 is greater than 3.0 and less than 4.0 is shown, but is not limited to these examples. The average number of boundary line segments 48 extending from one branch point 46 may be 3.0. When the average number of boundary line segments 48 extending from one branch point 46 is 3.0, the irregularly arranged opening regions 42 are more uniformly in the region where the mesh member 40 is formed. It can be in a distributed state.

  Also in the example satisfying the condition (F), the mesh member 40 of the screen door 30 is not over the entire region of the mesh member 40 of the screen door 30 as in the case of the example satisfying the above conditions (A) and (B). The condition (F) may be satisfied only in a part of the region.

  In addition, although some modified examples with respect to the above-described embodiment have been described, naturally, a plurality of modified examples can be applied in combination as appropriate.

(Use)
The mesh member 40 described above is not limited to the above-described mesh door 30, but for other uses such as a mosquito net configured by supporting the mesh member 40 so that a space surrounded by the mesh member 40 is formed. In contrast, it can be widely applied. Also, various members having repeated periodicity can be considered as the members used by being overlapped with the mesh member 40. For example, in the above-described example, the screen door 30 provided with the mesh member 40 is shown to be overlapped with the reed 60 having periodicity in the vertical direction, but in addition, the screen door 30 provided with the mesh member 40 is It may be superposed on a member such as a curtain having a periodicity in the horizontal direction due to the wrinkles and patterns. Even in this case, since the arrangement of the opening regions 42 of the mesh member 40 is sufficiently randomized, moire occurs due to interference between the pattern of the mesh member 40 and the pattern of a member such as a curtain. Can be prevented. In addition, as an example of a member that can overlap with the mesh member 40, for example, an armor door, a blind, a shutter, a wing, a door plate, a window plate, a sunscreen, a screen, A partition, a decorative board, etc. can be mentioned.

  Note that “overlap” is not only the case where the mesh member 40 and other members are in close proximity to each other, but also the case where the mesh member 40 and other members are not close but appear to overlap. It is a concept that also includes For example, a screen door 30 provided with a net-like member 40 attached to a first building and a fence attached to a second building that is several meters to several tens of meters apart in the first building. There may be a case where people appear to overlap each other. Even in such a case, according to the mesh member 40 described above, the pattern of the mesh member 40 of the first building and the second pattern can be obtained by sufficiently randomizing the arrangement of the opening regions 42 of the mesh member 40. It is possible to prevent the occurrence of moire due to the interference with the pattern of the wall 60 of the building.

30 Screen door 35 Frame member 40 Mesh member 42 Opening area 44 Line part 46 Branch point 48 Boundary line segment 60 簾 62 Lateral member 64 Longitudinal locking material XA Voronoi area XB Voronoi boundary XP Voronoi point U Maximum branching point interval

Claims (4)

A reticulated member in which a plurality of open areas are defined,
The mesh member is formed from a number of boundary line segments extending between two branch points to define the open region;
The mesh member includes an opening region surrounded by five boundary segments, an opening region surrounded by six boundary segments, and an opening region surrounded by seven boundary segments. Including an area containing at least two types,
A net-like member in which the shape or area of a plurality of opening regions surrounded by the same number of boundary lines out of 5, 6, or 7 included in the region is not constant.   The mesh member according to claim 1, wherein the region includes an open region surrounded by six boundary line segments.   The mesh member according to claim 1 or 2, wherein the area includes the largest number of opening areas surrounded by six boundary line segments. Of the open areas included in the area, the number of open areas surrounded by k boundary lines is N _k .
4. Any one of claims 1 to 3, wherein k is an integer satisfying 3 ≦ k ≦ 5, and N _k ≦ N _k +1, and when k is an integer satisfying 6 ≦ k, N _k ≧ N _k +1. A mesh member according to claim 1.

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