JP2020091582A - Wiring body and wiring board and touch sensor - Google Patents

Abstract

To provide a wiring body capable of improving visibility.SOLUTION: A wiring body comprises a first resin layer 20 and a first mash shaped conductor part 30 formed on the first resin layer 20. The first conductor part 30 has a first mesh shaped electrode pattern 31 formed by crossing multiple first conductor lines 311 and a first dummy pattern 35 arranged adjoining the first electrode pattern 31 and having a mesh shape repeating a second unit cell Uof a npolygon formed by crossing multiple second conductor lines 351. The first dummy patter 35 has a first disconnection part 352 formed at an intersection Q'of the multiple conductor line 351 and satisfies the following formulas (1) and (2), n≥4 (1) and n>n≥3 (2), where, nis the number of apexes of a npolygon and nis the number of the first disconnection part 352 per second unit cell U.SELECTED DRAWING: Figure 2

Description

The present invention relates to a wiring body, a wiring board, and a touch sensor.

There is known a planar body having a plurality of cut portions for cutting a conductor wire in a non-conductive portion region of a mesh electrode (for example, refer to Patent Document 1).

JP, 2010-262529, A

In the above-mentioned planar body, since the cut portions are formed at all the intersections of the conductor wires in the non-conductive portion area, the difference in the aperture ratio between the conductive portion area and the non-conductive portion area is large. .. Therefore, when this planar body is used for a touch panel, the pattern of the conductive portion region and the non-conductive portion region cannot be seen, so that the appearance does not look uniform and the visibility of the touch panel may deteriorate. is there.

The problem to be solved by the present invention is to provide a wiring body, a wiring board, and a touch sensor capable of improving visibility.

[1] A wiring body according to the present invention includes a first resin layer and a first conductor portion having a mesh shape and formed on the first resin layer, and the first conductor portion has a plurality of portions. A first electrode pattern having a mesh shape formed by intersecting the first conductor lines with a plurality of second conductor lines arranged so as to be adjacent to the first electrode pattern. A first dummy pattern having a mesh shape that repeats the formed n ₁ -gonal first unit cell, wherein the first dummy pattern is formed at an intersection of the plurality of second conductor lines. A wiring body having a first disconnection portion and satisfying the following expressions (1) and (2).
n ₁ ≧4 (1)
n ₁ >n _d1 ≧3 (2)
However, in the above formulas (1) and (2), n ₁ is the number of corners of the n ₁ polygon, and n _d1 is the number of the first disconnection portions per the first unit cell. ..

[2] In the above invention, the following formula (3) may be satisfied.
n _d1 /n ₁ >0.5 (3)

[3] In the above invention, the following expressions (4) and (5) may be satisfied.
n ₁ =4 (4)
n _d1 =3 (5)

[4] In the above invention, the following formula (6) may be satisfied.
|A ₁ −A ₂ |≦1 (6)
However, in the formula (6), A ₁ is the aperture ratio (%) of the first electrode pattern, and A ₂ is the aperture ratio (%) of the first dummy pattern.

[5] In the above invention, the wiring body is formed on the first resin layer, is formed on the second resin layer that covers the first conductor portion, and is formed on the second resin layer, and is a mesh. A second conductor portion having a shape, wherein the second conductor portion has a mesh-shaped second electrode pattern formed by intersecting a plurality of third conductor wires, and the second conductor portion. A second dummy pattern having a mesh shape that is arranged adjacent to the electrode pattern and repeats a second unit lattice of an n ₂ polygon formed by intersecting a plurality of fourth conductor lines. The second dummy pattern may have a second disconnection portion formed at an intersection of the plurality of fourth conductor lines, and may satisfy the following expressions (7) and (8).
n ₂ ≧4 (7)
n ₂ >n _d2 ≧3 (8)
However, in the above formulas (7) and (8), n ₂ is the number of corners of the n ₂ polygon, and n _d2 is the number of the second disconnection portions per the second unit cell. ..

[6] In the above invention, the first conductor portion and the second conductor portion may be arranged so as to be offset by a half pitch of the first unit lattice in a transparent plane view.

[7] In the above invention, at least a part of the first electrode pattern and at least a part of the second dummy pattern overlap with each other in at least a part of the second electrode pattern in a transmission plane view. A part and at least a part of the first dummy pattern may overlap.

[8] A wiring board according to the present invention is a wiring board including the wiring body described above and a support body that supports the wiring body.

[9] A touch sensor according to the present invention is a touch sensor including the wiring board described above.

According to the present invention, the number of disconnection portions formed at the corners of the first unit cell is set so as to satisfy the above expression (2), so that the first electrode pattern and the first dummy pattern are formed. Since it is possible to reduce the difference in aperture ratio between them, it is possible to improve the visibility.

FIG. 1 is an exploded perspective view showing a touch sensor according to an embodiment of the present invention. FIG. 2 is an enlarged plan view showing the first conductor portion. FIG. 3 is an enlarged plan view showing part III of FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. FIG. 5 is an enlarged plan view showing a V portion of FIG. FIG. 6 is an enlarged plan view showing the second conductor portion. FIG. 7 is an enlarged plan view in which the first conductor portion and the second conductor portion are overlapped. FIG. 8A to FIG. 8E are cross-sectional views illustrating the method for manufacturing the touch sensor according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 is an exploded perspective view showing a touch sensor according to an embodiment of the present invention, FIG. 2 is an enlarged plan view showing a first conductor portion, and FIG. 3 is an enlarged plan view showing a III portion in FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, FIG. 5 is an enlarged plan view showing a V portion of FIG. 2, and FIG. 6 is an enlarged plan view showing a second conductor portion. FIG. 7 is an enlarged plan view in which the first conductor portion and the second conductor portion are overlapped.

The touch sensor 1 shown in FIG. 1 is a projected capacitive touch panel sensor, and is used as an input device having a function of detecting a touch position, for example, in combination with a display device (not shown) or the like. The display device is not particularly limited, and a liquid crystal display, an organic EL display, electronic paper, or the like can be used. The touch sensor 1 has a detection electrode and a drive electrode (a first electrode pattern 31 and a second electrode pattern 51 described later) arranged so as to correspond to the display area of the display device. A predetermined voltage is periodically applied between the electrodes from an external circuit (not shown).

In such a touch sensor 1, for example, when the operator's finger (external conductor) F approaches the touch sensor 1, a capacitor (electrical capacitance) is formed between the external conductor F and the touch sensor 1, and two capacitors are formed. The electrical state between the electrodes changes. The touch sensor 1 can detect the operation position of the operator based on the electrical change between the two electrodes.

As shown in FIG. 1, the touch sensor 1 includes a wiring board 2 including a support body 5 and a wiring body 10, and a cover member 70 attached to one surface of the wiring board 2. The wiring board 2 of the present embodiment is configured to have transparency (translucency) as a whole in order to ensure the visibility of the display device. The “wiring body 10” in the present embodiment corresponds to an example of the “wiring body” in the present invention, the “support body 5” in the present embodiment corresponds to an example of the “support body” in the present invention, and in the present embodiment. The “wiring board 2” corresponds to an example of the “wiring board” in the present invention, and the “touch sensor 1” in the present embodiment corresponds to an example of the “touch sensor” in the present invention.

The support 5 has a rectangular outer shape and is made of a transparent material. Examples of the material forming the support 5 include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide resin (PI), polyetherimide resin (PEI), polycarbonate (PC), polyether ether ketone ( PEEK), liquid crystal polymer (LCP), cycloolefin polymer (COP), silicone resin (SI), acrylic resin, phenol resin, epoxy resin, glass and the like can be used. The wiring body 10 is attached to the support body 5, and the wiring body 10 is supported by the support body 5. In this case, it is preferable that the support body 5 has rigidity enough to support the wiring body 10.

As shown in FIG. 1, the wiring body 10 includes a first resin layer 20, a first conductor portion 30, a second resin layer 40, a second conductor portion 50, and a third resin layer 60. And are equipped with. This wiring body 10 is configured to have transparency (translucency) as a whole in order to ensure the visibility of the display device. The "first resin layer 20" in the present embodiment corresponds to an example of the "first resin layer" in the present invention, and the "first conductor portion 30" in the present embodiment is the "first conductor" in the present invention. The "second resin layer 40" in the present embodiment corresponds to an example of the "second resin layer" in the present invention, and the "second conductor portion 50" in the present embodiment corresponds to the "part". This corresponds to an example of the "second conductor portion" in the present invention.

In the present embodiment, the first conductor portion 30 is arranged on the first resin layer 20, and the second conductor portion 50 is arranged on the second resin layer 40. The second resin layer 40 is laminated on the layer 20. That is, while the first conductor portion 30 is arranged on one side of the second resin layer 40, the second conductor portion 50 is arranged on the other side of the second resin layer 40. The first conductor portion 30 and the second conductor portion 50 face each other with the second resin layer 40 interposed therebetween.

Further, the second conductor portion 50 is arranged closer to the side where the outer conductor F contacts than the first conductor portion 30. That is, the first conductor portion 30 is located on the display device side, and the second conductor portion 50 is located on the operator side (the surface side on which the outer conductor F contacts).

The first resin layer 20 has a rectangular outer shape. The first resin layer 20 holds the first conductor portion 30 on its one main surface. The first resin layer 20 is interposed between the first conductor portion 30 and the support body 5, and adheres and fixes the first conductor portion 30 and the support body 5 to each other.

As shown in FIG. 4, the first resin layer 20 has a flat portion 21 and a convex portion 22. The flat portion 21 is a layered portion of the first resin layer 20. The upper surface of the flat portion 21 is a substantially flat surface and has a substantially uniform thickness as a whole. Further, the first conductor portion 30 is not formed on the flat portion 21. The first resin layer 20 does not have to have the convex portion 22, and in this case, the first conductor portion 30 is formed on the flat portion 21.

The convex portion 22 projects toward the side away from the flat portion 21, and is formed integrally with the flat portion 21. The convex portion 22 has a taper shape that becomes narrower toward the first conductor portion 30 side (+Z direction in FIG. 4 ). The convex portion 22 is provided corresponding to the first conductor portion 30, and directly supports the first conductor portion 30. Note that FIG. 4 shows, as the convex portion 22, a portion that supports the first conductor wire 311a (described later) of the first conductor portion 30.

The first resin layer 20 is made of a resin material having transparency and electric insulation. Examples of such resin materials include UV curable resins, thermosetting resins, and thermoplastic resins, and more specifically, epoxy resins, acrylic resins, polyester resins, urethane resins, vinyl resins. Examples thereof include silicone resin, phenol resin, and polyimide resin.

The first conductor portion 30 is provided on the first resin layer 20, and is held by the first resin layer 20. The first conductor portion 30 includes a plurality of conductive particles and a binder resin that binds the conductive particles together. The first conductor portion 30 is formed by printing a conductive paste and curing it. As a specific example of the conductive paste, a conductive paste and a binder resin mixed with water or a solvent and various additives can be exemplified. The binder resin may be omitted from the conductive paste.

Specific examples of the conductive particles include metal materials and carbon-based materials. More specifically, examples of the metal material include silver, copper, nickel, tin, bismuth, zinc, indium, palladium and the like. Examples of carbon materials include graphite, carbon black (furnace black, acetylene black, Ketjen black), carbon nanotubes, carbon nanofibers, and the like. A metal salt may be used as the conductive particles. Specific examples of the metal salt include salts of the above-mentioned metals.

Specific examples of the binder resin include acrylic resin, polyester resin, epoxy resin, vinyl resin, urethane resin, phenol resin, polyimide resin, silicone resin and fluororesin. Specific examples of the solvent include α-terpineol, butyl carbitol acetate, butyl carbitol, 1-decanol, butyl cellosolve, diethylene glycol monoethyl ether acetate, tetradecane and the like.

As shown in FIG. 1, the first conductor portion 30 includes a plurality of first electrode patterns 31, a plurality of first lead lines 34, a plurality of first dummy patterns 35, and a plurality of first conductor patterns 30. The terminal portion 36 is included. The "first electrode pattern 31" in the present embodiment corresponds to an example of the "first electrode pattern" in the present invention, and the "first dummy pattern 35" in the present embodiment corresponds to the "first dummy pattern 35" in the present invention. This corresponds to an example of “first dummy pattern”.

The first electrode pattern 31 and the first dummy pattern 35 are seen in a transparent plan view (the wiring body 10 is located above or below (the direction normal to the main surface of the wiring body 10; the Z direction in the example shown in FIG. 1)). , The first electrode pattern 31 extends in the X direction in the figure, and is formed in a region overlapping with a transparent portion 71 (described later) of the cover member 70. The electrode patterns 31 are arranged in the Y direction in the figure, and each of the first electrode patterns 31 includes a plurality of first body portions 32 and a plurality of first connecting portions 33.

The first main body 32 has a substantially rhombic planar shape, and only the first main body 32 located at both ends of the first electrode pattern 31 has a substantially triangular planar shape. The plurality of first body portions 32 are arranged in the extending direction of the first electrode pattern 31 (X direction in the drawing). As shown in FIG. 2, the first main body portions 32 adjacent to each other are electrically connected to each other via the first connecting portion 33. The electrode width of the first electrode pattern 31 in the first connecting portion 33 (width in the Y direction in FIG. 2) is smaller than the electrode width of the first electrode pattern 31 in the first body portion 32. There is.

As shown in FIG. 2, the first electrode pattern 31 has a plurality of linear first conductor lines 311a and 311b. The first conductor wire 311a extends in the first direction D ₁ . On the other hand, the first conductive line 311b extends in a second direction different from _{D 2} to the first direction _{D 1.} In the present embodiment, the first direction D ₁ and the second direction D ₂ are substantially orthogonal to each other, but the intersection angle between the _first direction D ₁ and the second direction D ₂ is limited to 90 degrees. Not done. In the following, the first conductor lines 311a and 311b may be collectively referred to as the first conductor line 311. Further, the "first conductor wire 311" in the present embodiment corresponds to an example of the "first conductor wire" in the present invention.

The plurality of first conductor lines 311a are arranged at equal intervals (equal pitch P ₁ ), and similarly, the plurality of first conductor lines 311b are also arranged at equal intervals (equal pitch P ₁ ). As shown in FIG. 3, the first conductor lines 311a and 311b intersect with each other to form a plurality of first unit cells U ₁ . As a result, as shown in FIG. 2, the first electrode pattern 31 has a mesh shape in which the first grid U ₁ is repeated. In addition, in the present embodiment, the planar shape of the first unit cell U ₁ is a quadrangle, but the shape is not limited to this and may be another polygon.

The first conductor wire 311a is provided on the convex portion 22 of the first resin layer 20, as shown in FIG. The first conductor wire 311a has a taper shape that becomes gradually narrower as it separates from the first resin layer 20 when the cross section cut in the width direction of the first conductor wire 311a is viewed. In the first conductor wire 311a, the first contact surface 311c that contacts the convex portion 22 is relatively rough with respect to the top surface 311d that contacts the second resin layer 40.

Specifically, the surface roughness Ra of the first contact surface 311c is 0.1 μm to 3 μm, whereas the surface roughness Ra of the top surface 311d is 0.001 μm to 1.0 μm. There is. The surface roughness Ra is "arithmetic mean roughness Ra" defined by the JIS method (JIS B0601 (revised March 21, 2013)). The first conductor wire 311b also has a sectional shape similar to that of the first conductor wire 311a shown in FIG.

As shown in FIG. 1, one end of the first lead wire 34 is connected to one end of each first electrode pattern 31 in the longitudinal direction. A first terminal portion 36 is connected to the other end of each first lead wire 34. The first terminal portion 36 is located at the edge of the wiring body 10. The first terminal portion 36 is electrically connected to an external circuit via a connection wiring board such as an FPC.

The plurality of first dummy patterns 35 are arranged adjacent to the first electrode pattern 31. On the other hand, the plurality of first dummy patterns 35 are electrically insulated from the first electrode patterns 31. The first dummy pattern 35 is opposed to the second electrode pattern 51 via the second resin layer 40. Further, the first dummy pattern 35, the first electrode pattern 31, the first lead wire 34, and the first terminal portion 36 are provided on substantially the same plane.

As shown in FIG. 2, each first dummy pattern 35 has linear second conductor lines 351a and 351b intersecting with each other. These second conductor wires 351a and 351b have substantially the same cross-sectional shape (see FIG. 4) as the cross-sectional shape of the above-mentioned first conductor wire 311a. The one second conductor wire 351a extends in the first direction D ₁ , while the other second conductor wire 351b extends in the second direction D ₂ . In the following, the second conductor lines 351a and 351b may be collectively referred to as the second conductor line 351. Further, the "second conductor wire 351" in the present embodiment corresponds to an example of the "second conductor wire" in the present invention.

The plurality of second conductor lines 351a are arranged at equal intervals (equal pitch P ₁ ) similarly to the first conductor lines 311a. The plurality of second conductor lines 351b are also arranged at equal intervals (equal pitch P ₁ ) similarly to the first conductor lines 311b. The second conductor wire 351 has a plurality of first disconnection portions 352, and in these first disconnection portions 352, the second conductor wire 351 is removed (that is, the first conductor wire 351 is removed). The second conductor wire 351 is not formed in the disconnection portion 352.). 2 and 7, the width of the first disconnection portion 352 is exaggerated for easy understanding of the first dummy pattern 35 of the present embodiment.

As shown in FIG. 5, the second conductor lines 351a and 351b intersect with each other, so that the second unit lattice U ₂ having a square planar shape is formed. The second unit cell U ₂ has the same planar shape as the first unit cell U ₁ described above. As a result, as shown in FIG. 2, the entire first dummy pattern 35 has a mesh shape in which the _second unit lattice U ₂ is repeated. The “second unit cell U ₂ ”in this embodiment corresponds to an example of the “first unit cell” in the present invention.

In addition, in this embodiment, a quadrangle is illustrated as the planar shape of the second unit lattice U ₂ , but the present invention is not limited to this. The planar shape of the second unit cell U ₂ may be an n ₁ polygon that satisfies the following expression (1). In other words, the planar shape of the _second unit cell U ₂ may be a polygon having four or more corners.
n ₁ ≧4 (1)

Further, in the present embodiment, “the second conductor lines 351a and 351b intersect each other” means that the extension line L _va (virtual line L _va ) of the second conductor line 351a and the second conductor line 351b. It also includes that the extension line L _vb (virtual line L _vb ) intersects with each other.

As shown in FIG. 5, the second unit lattice U ₂ includes the above-described first disconnection portion 352, and a part of the vertices has an incomplete lattice shape that is cut off by the first disconnection portion 352. ing.

In the second unit cell U ₂ , the second conductor lines 351 actually intersect at the intersection Q ₁ . On the other hand, the first disconnection portion 352 is arranged on a vertex other than the intersection Q _{1 of} the second unit lattice U ₂ , and specifically, the second conductor wire 351a and the second conductor wire 351b. It is disposed on the intersection Q _'1 with. In the present embodiment, the first disconnection portion 352 is arranged on three vertices (three intersections Q′ ₁ ), and the second conductor is provided on the sides of the _second unit cell U ₂ excluding the vertices. The remaining portion where the line 351 remains is formed.

The intersection Q′ ₁ is an imaginary intersection existing at a point where the extension line L _va of the second conductor line 351a and the extension line L _{vb of} the second conductor line 351b intersect. In the present embodiment, the “intersection point of the second conductor wire” means not only the intersection point Q ₁ at which the second conductor wire 351 actually intersects but also the extension line L _va and the second conductor wire of the second conductor wire 351a. intersection Q _'1 of the virtual on which the extended line _{L vb} line 351b intersect is also comprise.

In the present embodiment, the number n _d1 of the first disconnection portions 352 included in one second unit lattice U ₂ is three (n _d1 =3), but the number is not limited to this. The number n _d1 of the first disconnection portions 352 included in one second unit cell U ₂ may be any number within the range of the following formula (2). In the present embodiment, since the shape of the second unit cell U ₂ is a quadrangle (n ₁ =4), only n _d1 =3 if the following expression (2) is satisfied. However, for example, when the shape of the second unit cell U ₂ is a pentagon (n ₁ =5), n _d1 satisfying the following formula (2) is either 3, 4 (n _d1 =3 or 4). ).
n ₁ >n _d1 ≧3 (2)

Returning to FIG. 2, the first disconnection portion 352 is also formed at the boundary with the first electrode pattern 31. As described above, the first disconnection portion 352 is formed between the second conductor wire 351 of the first dummy pattern 35 and the first conductor wire 311 of the first electrode pattern 31. , Both are not physically connected. Therefore, the first disconnection portion 352 electrically insulates the first dummy pattern 35 from the first electrode pattern 31.

Further, like the wiring body 10 in the present embodiment, it is preferable that the relationship of the following expression (3) is satisfied. That is, it is preferable that the first disconnection portion 352 is formed at a ratio of more than 50% of the vertices of the n ₁ polygon. In the present embodiment, the first disconnection portion 352 is arranged at 75% of the vertices of the n ₁ polygon. As described above, when the following expression (3) is satisfied, it becomes difficult to electrically connect the first dummy pattern 35 and the first electrode pattern 31 to each other, and the capacitance of the first dummy pattern 35 is large. Can be suppressed. Therefore, the sensitivity of the touch sensor 1 can be further improved.
n _d1 /n ₁ >0.5 (3)

Further, in the wiring body 10 according to the present embodiment, it is preferable that the following expression (4) is satisfied. That is, it is preferable absolute value of the difference between the opening ratio _A 1 of the first electrode pattern 31 (%) and the opening ratio _A 2 (%) of the first dummy pattern 35 is not more than 1 (%). In this way, by setting the difference in aperture ratio to 1 (%) or less, the difference in diffuse reflectance between the first electrode pattern 31 and the first dummy pattern 35 can be reduced. Therefore, the first electrode pattern 31 and the first dummy pattern 35 are less likely to be visually recognized, and the visibility can be further improved.
|A ₁ −A ₂ |≦1 (4)

The aperture ratio A ₁ of the first electrode pattern 31 can be calculated from the aperture ratio of the _first unit cell U ₁ as shown in FIG. 3, for example. The aperture ratio of the first unit cell U ₁ is determined by the first conductor wire 311 in the region surrounded by the center line CL _a of the first conductor wire 311 _a and the center line CL _b of the first conductor wire 311 _b. It is the ratio of the area not formed. This ratio may be regarded as the substantial aperture ratio A ₁ .

Similarly, the aperture ratio A ₂ of the first dummy pattern 35 can be calculated from the aperture ratio of the _second unit lattice U ₂ , as shown in FIG. 5, for example. The aperture ratio of the second unit cell _{U 2} is the center line CL _d and the area surrounded by the the center line CL _c of the second conductor line 351a second conductor line 351b, the second conductor line 351 It is the ratio of the area not formed. This ratio may be regarded as the substantial aperture ratio A ₂ .

Returning to FIG. 1, the second resin layer 40 has a rectangular outer shape. The cross-sectional shape of the second resin layer 40 is similar to the cross-sectional shape of the first resin layer 20 shown in FIG. 4, and has a flat portion and a convex portion. The second resin layer 40 is made of a transparent resin material. As this transparent resin material, for example, the same material as the resin material forming the first resin layer 20 can be used.

The second resin layer 40 is provided on the first resin layer 20 so as to cover the first conductor portion 30. A cutout 41 is formed in the second resin layer 40. The plurality of first terminal portions 36 are exposed from the cutout portion 41.

The second conductor portion 50 is provided on the second resin layer 40 and is held by the second resin layer 40. The second conductor portion 50 is formed by printing a conductive paste and curing it. As a specific example of the conductive paste, the same conductive paste as that forming the first conductor portion 30 can be exemplified.

The second conductor portion 50 includes a plurality of second electrode patterns 51, a plurality of second lead lines 54, a second dummy pattern 55, and a second terminal portion 56. The "second electrode pattern 51" in the present embodiment corresponds to an example of the "second electrode pattern" in the present invention, and the "second dummy pattern 55" in the present embodiment is the "second dummy pattern 55" in the present invention. This corresponds to an example of “second dummy pattern”.

As shown in FIG. 1, the second electrode pattern 51 and the second dummy pattern 55 are formed in a region overlapping with a transparent portion 71 (described later) of the cover member 70 in a transparent plan view. Further, each second electrode pattern 51 extends in the Y direction in the figure. Then, the plurality of second electrode patterns 31 are arranged in the X direction in the drawing. Each second electrode pattern 51 includes a plurality of second body portions 52 and a plurality of second connecting portions 53.

As shown in FIG. 1, the second main body 52 has a substantially rhombic shape, and only the second main body 52 located at both ends of the second electrode pattern 51 has a substantially triangular shape. ing. The plurality of second body portions 52 of the second electrode pattern 51 are arranged in the extending direction of the second electrode pattern 51 (Y direction in the drawing). The second main body portions 52 adjacent to each other are electrically connected to each other via the second connecting portion 53. The electrode width of the second electrode pattern 51 in the second connecting portion 53 is smaller than the electrode width of the second electrode pattern 51 in the second body portion 52.

As shown in FIG. 6, the second electrode pattern 51 has a plurality of linear third conductor lines 511a and 511b. The third conductor line 511a extends in the first direction D ₁ . On the other hand, the third conductor line 511b extends in a second direction different from _{D 2} to the first direction _{D 1.} Note that, hereinafter, the third conductor lines 511a and 511b may be collectively referred to as the third conductor line 511. The “third conductor wire 511” in the present embodiment corresponds to an example of the “third conductor wire” in the present invention.

The third conductor wire 511 has the same cross-sectional shape as the first conductor wire 311a shown in FIG. 4, and the line width of the third conductor wire 511 is the same as the line width of the first conductor wire 311a. Are equal.

The plurality of third conductive lines 511a are arranged at equal intervals (equal pitch _{P 1)} are arranged in the same manner, a plurality of third conductive lines 511b also equidistant (equal pitch _{P 1).} In addition, in the present embodiment, the pitch of the third conductor lines 511 is set to the same value as that of the first conductor lines 311, but the present invention is not limited to this, and the pitch of the third conductor lines 511 is set to the first conductor lines 311. May be set to a different value.

As shown in FIG. 6, the third conductor lines 511a and 511b intersect each other to form a plurality of third unit cells U ₃ . The third unit cell U ₃ has the same planar shape as the above-mentioned first unit cell U ₁ . As a result, the second electrode pattern 51 has a mesh shape in which the third grid U ₃ is repeated. In addition, in the present embodiment, the planar shape of the first unit cell U ₃ is a quadrangle, but the shape is not limited to this and may be another polygon.

Returning to FIG. 1, one end of the second lead wire 54 is connected to one end of each of the second electrode patterns 51 in the longitudinal direction. The second terminal portion 56 is connected to the other end of each second lead wire 54. The second terminal portion 56 is located at the edge of the wiring body 10. The second terminal portion 56 is electrically connected to the external circuit.

The plurality of second dummy patterns 55 are arranged so as to be adjacent to the second electrode pattern 51. On the other hand, the plurality of second dummy patterns 55 are electrically insulated from the second electrode patterns 51. The second dummy pattern 55 faces the first electrode pattern 31 with the second resin layer 40 in between. Moreover, the second dummy pattern 55, the second electrode pattern 51, the second lead wire 54, and the second terminal portion 56 are provided on substantially the same plane.

As shown in FIG. 6, each second dummy pattern 55 has linear fourth conductor lines 551a and 551b intersecting with each other. These fourth conductor wires 551a and 551b have substantially the same cross-sectional shape as the above-mentioned third conductor wire 511a. One of the fourth conductor wires 551a extends in the first direction D ₁ , while the other of the fourth conductor wires 551b extends in the second direction D ₂ . In the following, the fourth conductor lines 551a and 551b may be collectively referred to as the fourth conductor line 551. The "fourth conductor wire 551" in the present embodiment corresponds to an example of the "fourth conductor wire" in the present invention.

The plurality of fourth conductor lines 551a are arranged at equal intervals (equal pitch P ₁ ) similarly to the third conductor line 511a. The plurality of fourth conductor lines 551b are also arranged at equal intervals (equal pitch P ₁ ) similarly to the third conductor line 511b. The fourth conductor wire 551 has a plurality of second disconnection portions 552, and the fourth conductor wire 551 is removed from these second disconnection portions 552 (that is, the second conductor wire 551 is removed). The fourth conductor wire 551 is not formed in the disconnection portion 551.) Incidentally, in FIGS. 6 and 7, the width of the second disconnection portion 552 is exaggerated in order to explain the second dummy pattern 55 of the present embodiment in an easily understandable manner.

As shown in FIG. 6, the fourth conductor lines 551a and 551b intersect with each other to form a fourth unit cell U ₄ having a quadrangular planar shape. The fourth unit cell U ₄ has the same planar shape as the second unit cell U ₂ (see FIG. 5) described above. As a result, the entire second dummy pattern 55 has a mesh shape in which the _fourth unit lattice U ₄ is repeated. The “fourth unit cell U ₄ ”in this embodiment corresponds to an example of the “second unit cell” in the present invention.

In addition, in the present embodiment, a quadrangle is illustrated as the planar shape of the fourth unit lattice U ₄ , but the present invention is not limited to this. The planar shape of the fourth unit cell U ₄ of may be a n ₂ square satisfying the following equation (5). In other words, the planar shape of the _fourth unit cell U ₄ may be a polygon having four or more corners.
n ₂ ≧4 (5)

Further, similarly to the first dummy pattern 35, in the present embodiment, “the fourth conductor lines 551a and 551b intersect with each other” means that an extension line (virtual line) of the fourth conductor line 551a and a fourth line. It also includes that the extension line (virtual line) of the fourth conductor line 551b intersects with each other.

As shown in FIG. 6, the fourth unit cell U ₄ includes the above-described second disconnection portion 552, and some vertices have an incomplete lattice shape with the second disconnection portion 552 missing. ing.

In the fourth unit cell U ₄ , the fourth conductor line 551 actually intersects at the intersection R ₁ . On the other hand, the second disconnection portion 552 is arranged on a vertex other than the intersection R _{1 of} the fourth unit lattice U ₄ , and the intersection R′ of the fourth conductor line 551a and the fourth conductor line 551b. It is arranged above ₁ . In the present embodiment, the second disconnection portion 552 is arranged on the three vertices (three intersections R′ ₁ ), and the fourth conductor is provided on the side excluding the vertices of the _fourth unit cell U _4. The remaining portion where the line 551 remains is formed.

The intersection R′ ₁ is a point where the extension line (virtual line) of the fourth conductor line 551a and the extension line (virtual line) of the fourth conductor line 551b intersect, similarly to the intersection point Q′ _1. It is a virtual intersection that exists in. That is, in the present embodiment, the “intersection point of the fourth conductor wire” means, in addition to the intersection point R ₁ at which the fourth conductor wires 551 actually intersect with each other, the extension line of the fourth conductor wire 551a and the fourth conductor wire 551a. intersection R _'1 on the imaginary and the extension of the conductor line 551b intersect including.

In the present embodiment, the number n _d1 of the second disconnection portions 552 included in one fourth unit lattice U ₄ is three (n _d1 =3), but the number is not limited to this. The number n _d2 of the second disconnection portions 552 included in the second unit lattice U ₄ may be any number within the range of the following formula (6).
n ₂ >n _d2 ≧3 (6)

Returning to FIG. 2, the second disconnection portion 552 is also formed at the boundary with the second electrode pattern 51. In this way, the second disconnection portion 552 is formed between the fourth conductor wire 551 of the second dummy pattern 55 and the third conductor wire 511 of the second electrode pattern 51. , Both are not physically connected. Therefore, the second disconnection portion 552 electrically insulates the second dummy pattern 55 from the second electrode pattern 51.

As shown in FIG. 7, the first conductor portion 30 has the second conductor portion 50 and the pitch P _{1 of} the second unit lattice U ₂ (the pitch P ₁ between the second conductor lines 311) in the transmission plane view. ) Half the pitch is offset and they overlap. That is, the distance between the first and second conductor lines 311 and 351 and the third and fourth conductor lines 511 and 551 is (P ₁ /2) in the transparent plane view.

In the transparent plane view, the first electrode pattern 31 and the second electrode pattern 51 intersect with each other, and the first connecting portion 33 of the first electrode pattern 31 and the second electrode pattern 51 of the second electrode pattern 51 intersect. And the connecting portion 53 of No. 1 overlap. In other words, the first connecting portion 33 and the second connecting portion 53 are opposed to each other with the second resin layer 40 in between. On the other hand, in a plan view, the first main body portion 32 of the first electrode pattern 31 and the second main body portion 52 of the second electrode pattern 51 do not overlap.

The first dummy pattern 35 overlaps with the second main body portion 52 of the second electrode pattern 51, and the second dummy pattern 55 overlaps with the first main body portion 32 of the first electrode pattern 31. overlapping. That is, the second unit grid U ₂ forming the first dummy pattern 35 and the third unit grid U ₃ forming the second electrode pattern 51 are shifted by a half pitch and overlap each other, and Similarly, the fourth unit grating U ₄ forming the dummy pattern 55 and the first unit grating U ₁ forming the first electrode pattern 31 are shifted by a half pitch and overlap each other. As a result, a substantially uniform mesh shape in which substantially the same small lattices are repeated is formed in a transparent plane view.

As shown in FIG. 1, the third resin layer 60 has a rectangular outer shape and is made of a transparent resin material. As the transparent resin material, for example, the same resin material as the resin material forming the first resin layer 20 can be used.

The third resin layer 60 is provided on the second resin layer 40 so as to cover the second conductor portion 50. The third resin layer 60 also functions as a protective layer that protects the second conductor portion 50. A cutout 61 is formed in the third resin layer 60. The second terminal portion 56 is exposed from the cutout portion 61. The cutout 61 overlaps the cutout 41 of the second resin layer 40 described above, and the first terminal portion 36 is also exposed from the cutout 61.

The cover member 70 is attached to the wiring body 10 via the third resin layer 60. As shown in FIG. 1, the cover member 70 includes a transparent portion 71 capable of transmitting visible light and a shielding portion 72 that shields visible light. The transparent portion 71 is formed in a rectangular shape, and the shielding portion 72 is formed in a rectangular frame shape around the transparent portion 71. The cover member 70 has an adhesive layer (not shown) on the surface on the third resin layer 60 side.

As the transparent material forming the cover member 70, the same material as the material forming the support 5 can be used. Further, the shielding portion 72 is formed by applying, for example, black ink to the outer peripheral portion of the back surface of the cover member 70. In the present embodiment, as shown in FIG. 1, the outer conductor F (finger F) contacts the cover member 70.

The cover member 70 may have rigidity enough to support the wiring body 10. In this case, the cover member 70 corresponds to an example of the support in the present invention. Further, in this case, the above-mentioned support 5 may be omitted.

As described above, in the present embodiment, in the second unit lattice U ₂ forming the first dummy pattern 35, the number of the first disconnection portions 352 is smaller than the number of intersections of the second conductor lines 351. (N ₁ >n _d1 ). As a result, the difference in aperture ratio between the first dummy pattern 35 and the first electrode pattern 31 can be reduced, so that the first dummy pattern 35 and the first electrode pattern 31 are difficult to see. That is, according to the present embodiment, it is possible to prevent the appearance of bones in which the first dummy pattern 35 and the first electrode pattern 31 are visible, and to improve the visibility.

Further, in the second unit cell U ₂ , the number of the first disconnection portions 352 is set to 3 or more (n _d1 ≧3), so that the first dummy pattern 35 and the first electrode pattern 31 are separated from each other. Insulation can be ensured, and the capacitance of the first dummy pattern 35 can be prevented from increasing.

In addition, in the fourth unit lattice U ₄ forming the second dummy pattern 55, the number of the second disconnection portions 552 is smaller than the number of intersections of the fourth conductor lines 551 (n ₂ >n). _d2 ). This makes it possible to reduce the difference in aperture ratio between the second dummy pattern 55 and the second electrode pattern 51, so that the second dummy pattern 55 and the second electrode pattern 51 are difficult to see. That is, according to the present embodiment, it is possible to prevent the appearance of bones in which the second dummy pattern 55 and the second electrode pattern 51 are visible, and to improve the visibility. Further, by overlapping the second electrode pattern 51 and the second dummy pattern 55 on the first electrode pattern 31 and the first dummy pattern 35 of the present embodiment, it is possible to further suppress the occurrence of bone appearance. ..

Further, in the fourth unit cell U ₄ , the number of the second disconnection portions 552 is set to 3 or more (nd ₂ ≧3), so that the second dummy pattern 55 and the second electrode pattern 51 are separated from each other. Insulation can be ensured, and the increase in the capacitance of the second dummy pattern 55 can be suppressed.

Next, a method for manufacturing the above-described touch sensor 1 will be described with reference to FIGS. 8(a) to 8(e). 8A to 8E are cross-sectional views showing the method for manufacturing the touch sensor according to the present embodiment.

First, as shown in FIG. 8A, an intaglio 100 having a concave pattern 101 is prepared. Examples of the material forming the intaglio plate 100 include nickel, silicon, glasses, organic silicas, glassy carbon, thermoplastic resin, and photo-curable resin. In order to improve releasability, a release layer (not shown) made of carbon-based material, silicone-based material, fluorine-based material, ceramic-based material, aluminum-based material, or the like is previously formed on the surface of the concave pattern 101. It is preferable to keep it.

Then, the concave pattern 101 of the intaglio plate 100 is filled with the conductive material 300. As the conductive material 300 with which the concave pattern 101 is filled, the conductive paste described above is used. Examples of the method of filling the conductive material 300 include a dispensing method, an inkjet method, and a screen printing method. Alternatively, as a filling method of the conductive material 300, after coating by a slit coating method, a bar coating method, a blade coating method, a dip coating method, a spray coating method, a spin coating method, the coating is applied to a portion other than the concave pattern 101. A method of wiping, scraping, sucking, sticking, washing, or blowing away the conductive material 300 can also be used.

Next, as shown in FIG. 8B, the conductive material 300 is dried or heated to form the first conductor portion 30. The conditions for drying or heating the conductive material 300 can be appropriately set according to the composition of the conductive material 300 and the like. The volume of the conductive material 300 is contracted by the drying or heating conditions, and the first contact surface 311c having the uneven shape of the first conductor portion 30 is formed. At this time, the outer surface of the conductive material 300 excluding the upper surface is formed along the concave pattern 101. The method of treating the conductive material 300 is not limited to heating. Energy rays such as infrared rays, ultraviolet rays, and laser light may be irradiated, or only drying may be performed. Moreover, you may combine these 2 or more types of processing methods.

Next, as shown in FIG. 8C, a resin material 120 for forming the first resin layer 20 is applied on the intaglio 100. As such a resin material 120, the material forming the above-mentioned first resin layer 20 is used. Examples of the method for applying the resin material 120 include a screen printing method, a spray coating method, a bar coating method, a dipping method, an inkjet method, and the like. By this application, the resin material 120 enters the concave pattern 101 in which the first conductor portion 30 is formed.

Next, as shown in FIG. 8D, the support 5 is placed on the resin material 120. This arrangement is preferably performed under vacuum in order to prevent bubbles from entering between the resin material 120 and the support 5. Then, the resin material 120 is cured to form the first resin layer 20 having the convex portions 22 (see FIG. 4 ). Examples of the method for curing the resin material 120 include irradiation with energy rays such as ultraviolet rays and infrared laser rays, heating, heating and cooling, and drying.

In this embodiment, the support 5 is laminated after the resin material 120 is applied to the intaglio 100, but the present invention is not limited to this. For example, the resin material 120 may be applied to the support 5 in advance, and the support 5 may be placed on the intaglio 100.

Next, as shown in FIG. 8E, the support body 5, the first resin layer 20, and the first conductor portion 30 are released from the intaglio 100. Thereby, the intermediate body 3 can be obtained.

The second resin layer 40 and the second conductor portion 50 can also be formed using an intaglio plate. That is, first, the second conductor portion 50 is formed in the same manner as in FIGS. 8A and 8B. Next, the side of the intermediate body 3 on which the first conductor portion 30 is formed and the intaglio filled with the second conductor portion 50 are interposed via a resin material serving as a precursor of the second resin layer 40. To glue. Next, after the resin material is cured to form the second resin layer 40, the intermediate 3 is released from the intaglio with the second conductor portion 50 and the second resin layer 40. Thereby, the wiring board 2 can be obtained.

Next, the cover member 70 is attached to the main surface of the wiring board 2 on the side where the second conductor portion 50 is formed, with the third resin layer 60 interposed therebetween. As described above, the touch sensor 1 of this embodiment can be obtained.

The embodiments described above are described to facilitate understanding of the present invention, and are not described to limit the present invention. Therefore, each element disclosed in the above-described embodiments is intended to include all design changes and equivalents within the technical scope of the present invention.

For example, in the above-described embodiment, the first and second electrode patterns 31, 51 include the wide portion including the first and second body portions 32, 52 and the first and second connecting portions 33, 53. And a narrow portion that includes, but is not particularly limited to. For example, the first and second electrode patterns 31 and 51 may have a band shape with a constant width in the extending direction.

Further, in the above-described embodiment, the first and second lead wires 34, 54 are made of one conductor wire, but the present invention is not limited to this. The first and second leader lines 34, 54 may have a mesh shape including a plurality of conductor lines intersecting with each other.

Further, for example, in the above embodiment, the support body 80 may be omitted from the touch sensor 1. Since the wiring member 10 can be supported by the cover member 70, the support member 80 may be omitted. In this case, the cover member 70 corresponds to an example of the support in the present invention.

For example, instead of the support 5 described above, a mounting target (film, surface glass, polarizing plate, display glass, etc.) is adhered to the lower surface of the first resin layer 20, and the wiring body 10 is supported by the mounting target. You may comprise a wiring body as. In this case, a release sheet may be provided on the lower surface of the first resin layer 20, and the release sheet may be peeled off at the time of mounting and adhered to the mounting target. Alternatively, a configuration may be adopted in which a resin layer that covers the wiring body 10 is further provided from the first resin layer 20 side, and the wiring target 10 is adhered and mounted on the mounting target through the resin layer. Alternatively, the third resin layer 60 side may be adhered to the above-mentioned mounting target to be mounted. In these cases, the mounting target for mounting the wiring body corresponds to an example of the support of the present invention.

Furthermore, in the above embodiment, the wiring body or the wiring board is described as being used for the touch sensor, but the present invention is not particularly limited to this. For example, the wiring body may be used as a heater by energizing the wiring body to generate heat by resistance heating or the like. Further, the wiring body may be used as an electromagnetic shielding shield by grounding a part of the conductor portion of the wiring body. Further, the wiring body may be used as an antenna. In this case, the mounting target on which the wiring body is mounted corresponds to an example of the support of the present invention. Further, the wiring body can be used for a switch. For example, in this switch, one first electrode pattern and a first dummy pattern arranged at least at a part of the periphery of the first electrode pattern, A wiring body provided with can be used.

Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples. The following examples and comparative examples are for confirming the effect of improving the visibility of the touch sensor in the above-described embodiment.

<Example 1>
The touch sensor of this embodiment was manufactured according to the method of manufacturing the touch sensor of this embodiment shown in FIGS. 8A to 8E. At this time, the second unit lattice U ₂ of the first dummy pattern 35 is a quadrangle (n ₁ =4), and the number of the first disconnection portions 352 per one _second unit lattice U ₂ is three. (N _d1 =3). The fourth unit cell U ₄ of the second dummy pattern 55 has the same shape as the second unit cell U ₂ (that is, n ₂ =4, n _d2 =3). The aperture ratio A ₁ of the first and second electrode patterns 31 and 51 is 87.1 (%), and the aperture ratio A ₂ of the first and second dummy patterns 35 and 55 is 88.4 (%). )Met.

<Example 2>
A touch sensor was produced in the same manner as in Example 1 except that the aperture ratio A ₂ of the first and second dummy patterns 35 and 55 was changed to 88.1(%).

<Example 3>
A touch sensor was produced in the same manner as in Example 1 except that the aperture ratio A ₂ of the first and second dummy patterns 35 and 55 was changed to 87.4(%).

In Examples 2 and 3, the aperture ratios of the first and second dummy patterns 35 and 55 are the same as the width of the first disconnection portion 352 (the length of the virtual line L _va or the virtual line L _vb in FIG. 5). It was adjusted by adjusting (equivalent).

<Comparative Example 1>
The number of the first disconnection portions 352 per one _second unit lattice U _{2 is set} to 4 (n _d1 =4), and the number of the second disconnection portions 552 per one fourth unit lattice U _{4 is} increased. A touch sensor was produced in the same manner as in Example 1 except that the number was four ( _nd2 =4). At this time, the aperture ratio A ₂ of the first and second dummy patterns 35 and 55 was 88.9 (%).

It is visually confirmed whether or not bones are visible in the touch sensor in the above-described Examples and Comparative Examples (whether the first and second electrode patterns and the first and second dummy patterns are visible). By doing so, the visibility of the touch sensor was evaluated. The results are shown in Table 1.

As can be seen from Table 1, when the number of n _d1 and n _d2 is three (Examples 1 to 3), the aperture ratio is smaller than that of Comparative example 1 in which n _d1 and n _d2 are four. The difference (A ₁ −A ₂ ) became smaller. As a result, in Examples 1 to 3, the bone was less visible than in Comparative Example 1 and the visibility was improved.

In addition, in Examples 2 and 3 in which the difference in the aperture ratio (A ₁ -A ₂ ) was 1% or less, it was confirmed that the bones were less visible than in Example 1 and the visibility was further improved. Was done.

DESCRIPTION OF SYMBOLS 1... Touch sensor 2... Wiring board 3... Intermediate body 5... Support body 10... Wiring body 20... 1st resin layer 21... Flat part 22... Convex part 30... 1st conductor part 31... 1st electrode pattern
311, 311a, 311b... First conductor wire
311c...first contact surface
311d...top surface
32... Main body
33... Connection part 34... 1st leader line 35... 1st dummy pattern
351, 351a, 351b... Second conductor wire
352... 1st disconnection part 36... 1st terminal part 40... 2nd resin layer 41... Notch part 50... 2nd conductor part 51... 2nd electrode pattern
511, 511a, 511b... Third conductor wire
52... Main body
53... Connection part 54... Second leader line 55... Second dummy pattern
551, 551a, 551b... Fourth conductor wire
552... 2nd disconnection part 56... 2nd terminal part 60... 3rd resin layer 61... Notch part 70... Cover member 71... Transparent part 72... Shield part 100... Intaglio 101... Recessed pattern 120... Resin material 300... Conductive material F... Outer conductor

Claims (9)

A first resin layer,
A first conductor portion formed on the first resin layer and having a mesh shape,
The first conductor portion is
A first electrode pattern having a mesh shape formed by intersecting a plurality of first conductor lines;
A first dummy pattern having a mesh shape that is arranged adjacent to the first electrode pattern and that repeats a first unit cell of an n ₁ polygon formed by intersecting a plurality of second conductor lines; Have
The first dummy pattern has a first disconnection portion formed at an intersection of the plurality of second conductor lines,
A wiring body that satisfies the following formulas (1) and (2).
n ₁ ≧4 (1)
n ₁ >n _d1 ≧3 (2)
However, in the above formulas (1) and (2), n ₁ is the number of corners of the n ₁ polygon, and n _d1 is the number of the first disconnection portions per the first unit cell. .. The wiring body according to claim 1,
A wiring body that satisfies the following expression (3).
n _d1 /n ₁ >0.5 (3) The wiring body according to claim 1 or 2, wherein
A wiring body that satisfies the following expressions (4) and (5).
n ₁ =4 (4)
n _d1 =3 (5) The wiring body according to any one of claims 1 to 3,
A wiring body that satisfies the following expression (6).
|A ₁ −A ₂ |≦1 (6)
However, in the formula (6), A ₁ is the aperture ratio (%) of the first electrode pattern, and A ₂ is the aperture ratio (%) of the first dummy pattern. The wiring body according to any one of claims 1 to 4,
The wiring body is
A second resin layer formed on the first resin layer and covering the first conductor portion;
A second conductor portion formed on the second resin layer and having a mesh shape,
The second conductor portion is
A second electrode pattern having a mesh shape formed by intersecting a plurality of third conductor lines;
A second dummy pattern having a mesh shape which is arranged adjacent to the second electrode pattern and which repeats a second unit lattice of an n ₂ polygon formed by intersecting a plurality of fourth conductor lines; Have
The second dummy pattern has a second disconnection portion formed at an intersection of the plurality of fourth conductor lines,
A wiring body that satisfies the following expressions (7) and (8).
n ₂ ≧4 (7)
n ₂ >n _d2 ≧3 (8)
However, in the above formulas (7) and (8), n ₂ is the number of corners of the n ₂ polygon, and n _d2 is the number of the second disconnection portions per the second unit cell. .. The wiring body according to claim 5,
A wiring body in which the first conductor portion and the second conductor portion are arranged so as to be displaced by a half pitch of the first unit lattice in a transparent plane view. The wiring body according to claim 5 or 6, wherein
In transparent plan view, at least a portion of the first electrode pattern and at least a portion of the second dummy pattern overlap, and at least a portion of the second electrode pattern and the first dummy electrode pattern. A wiring body in which at least a part of the dummy pattern of is overlapped with. The wiring body according to any one of claims 1 to 7,
A wiring board comprising: a support that supports the wiring body. A touch sensor comprising the wiring board according to claim 8.

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