Wiring board and method for manufacturing the same

Abstract

To provide a wiring board and a manufacturing method for the wiring board that can obscure a wiring pattern area.SOLUTION: A wiring board 10 includes a transparent substrate 11, a wiring pattern region 20 arranged on the substrate 11 and including a plurality of pieces of wiring 21 and 22, and a dummy pattern region 30 arranged around the wiring pattern region 20 and including a plurality of pieces of dummy wiring 30a electrically independent of the pieces of wiring 21 and 22. The wiring pattern area 20 is composed of predetermined unit patterns 20A that are repeatedly arranged along a first direction. In the first direction, the spacing G1 between the wiring pattern region 20 and the dummy pattern region 30 is 0.01 to 0.2 times the pitch Pb of the unit pattern 20A in the first direction.SELECTED DRAWING: Figure 2A

Description

[Technical Field]

[0001] An embodiment of the present disclosure relates to a wiring substrate and a method for manufacturing the wiring substrate. [Background technology]

[0002] Currently, mobile terminal devices such as smartphones and tablets are becoming increasingly sophisticated, smaller, thinner, and lighter. These mobile terminal devices use multiple communication bands, requiring multiple antennas corresponding to the communication bands. For example, mobile terminal devices are equipped with multiple antennas, such as a telephone antenna, a Wi-Fi (Wireless Fidelity) antenna, a 3G (Generation) antenna, a 4G (Generation) antenna, an LTE (Long Term Evolution) antenna, a Bluetooth (registered trademark) antenna, and an NFC (Near Field Communication) antenna. However, as mobile terminal devices become smaller, the space available for antenna installation is limited, limiting the degree of freedom in antenna design. Furthermore, because antennas are built into a limited space, radio wave sensitivity is not always satisfactory.

[0003] For this reason, film antennas that can be mounted in the display area of ​​mobile terminal devices have been developed. These film antennas are transparent antennas in which an antenna pattern is formed on a transparent substrate, and the antenna pattern is formed by a mesh-like conductive mesh layer that consists of conductor portions as formed portions of an opaque conductive layer and numerous openings as non-formed portions. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-66610 [Patent Document 2] Patent No. 5636735 specification [Patent Document 3] Patent No. 5695947 specification Summary of the Invention [Problem to be solved by the invention]

[0005] For example, in a conventional film antenna, one or more mesh antennas are mounted on a transparent substrate, and both areas on the transparent substrate where an antenna pattern is formed and areas where no antenna pattern is formed exist. In this case, the areas where no antenna pattern is formed make the areas where the antenna pattern is formed easily visible. For this reason, there is a demand for making wiring patterns such as antenna patterns less visible.

[0006] An object of the present embodiment is to provide a wiring board and a method for manufacturing the wiring board that can make the wiring pattern area less visible. [Means for solving the problem]

[0007] A wiring board according to one embodiment of the present disclosure comprises a transparent substrate, a wiring pattern region disposed on the substrate and including a plurality of wirings, and a dummy pattern region disposed around the wiring pattern region and including a plurality of dummy wirings electrically independent from the wirings, wherein the wiring pattern region is composed of predetermined unit patterns repeatedly arranged along a first direction, and the spacing between the wiring pattern region and the dummy pattern region in the first direction is between 0.01 and 0.2 times the pitch of the unit patterns in the first direction.

[0008] In a wiring board according to one embodiment of the present disclosure, the unit patterns may be repeatedly arranged along a second direction different from the first direction, and in the second direction, the spacing between the wiring pattern region and the dummy pattern region may be 0.01 to 0.2 times the pitch of the unit patterns in the second direction.

[0009] In a wiring board according to an embodiment of the present disclosure, the dummy pattern region may be composed of predetermined dummy unit patterns arranged repeatedly, and the shape of the dummy unit patterns may be the same as the shape of the unit patterns.

[0010] A wiring board according to one embodiment of the present disclosure comprises a transparent substrate, a wiring pattern region disposed on the substrate and including a plurality of wirings, and a dummy pattern region disposed around the wiring pattern region and including a plurality of dummy wirings electrically independent from the wirings, wherein the wiring pattern region is composed of predetermined unit patterns repeatedly arranged along a first direction, the dummy pattern region is composed of a plurality of isolated patterns that are independent of each other, the length of the dummy wirings of the isolated patterns is 4.0 times or less the length of the wirings of the unit patterns, and the spacing between the isolated patterns in the first direction is 0.01 times or more and 0.2 times or less the pitch of the unit patterns in the first direction.

[0011] In a wiring board according to one embodiment of the present disclosure, the distance between the wiring pattern region and the dummy pattern region in the first direction may be greater than or equal to 0.01 times and less than or equal to 0.2 times the pitch of the unit patterns in the first direction.

[0012] In a wiring board according to one embodiment of the present disclosure, the unit patterns may be repeatedly arranged along a second direction different from the first direction, and the spacing between the isolated patterns in the second direction may be 0.01 to 0.2 times the pitch of the unit patterns in the second direction.

[0013] In a wiring board according to one embodiment of the present disclosure, the distance between the wiring pattern region and the dummy pattern region in the second direction may be greater than or equal to 0.01 times and less than or equal to 0.2 times the pitch of the unit patterns in the second direction.

[0014] In the wiring board according to the embodiment of the present disclosure, the isolated pattern may include a dummy unit pattern, and the shape of the dummy unit pattern may be the same as the shape of the unit pattern.

[0015] The wiring board according to the embodiment of the present disclosure may have a radio wave transmission and reception function.

[0016] A method for manufacturing a wiring board according to one embodiment of the present disclosure includes the steps of preparing a transparent substrate, and forming on the substrate a wiring pattern region including a plurality of wirings, and a dummy pattern region including a plurality of dummy wirings arranged around the wiring pattern region and electrically independent of the wirings, wherein the wiring pattern region is composed of predetermined unit patterns repeatedly arranged along a first direction, and the spacing between the wiring pattern region and the dummy pattern region in the first direction is 0.01 to 0.2 times the pitch of the unit patterns in the first direction.

[0017] A method for manufacturing a wiring board according to one embodiment of the present disclosure includes the steps of preparing a transparent substrate, and forming on the substrate a wiring pattern region including a plurality of wirings, and a dummy pattern region including a plurality of dummy wirings arranged around the wiring pattern region and electrically independent of the wirings, wherein the wiring pattern region is composed of predetermined unit patterns repeatedly arranged along a first direction, the dummy pattern region is composed of isolated patterns that are independent of each other, the length of the isolated patterns is 4.0 times or less the length of the unit patterns, and the spacing between the isolated patterns in the first direction is 0.01 times or more and 0.2 times or less the pitch of the unit patterns in the first direction. [Effects of the Invention]

[0018] According to the embodiments of the present disclosure, the wiring pattern area can be made less visible. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a plan view showing a wiring board according to a first embodiment. [Figure 2A] FIG. 2A is an enlarged plan view (enlarged view of a portion IIA in FIG. 1) showing the wiring board according to the first embodiment. [Figure 2B] FIG. 2B is an enlarged plan view (enlarged view of part IIB in FIG. 1) showing the wiring board according to the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view (cross-sectional view taken along line III-III in FIG. 2A) showing the wiring board according to the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view (cross-sectional view taken along line IV-IV in FIG. 2A) showing the wiring board according to the first embodiment. [Figure 5] FIG. 5 is a cross-sectional view (cross-sectional view taken along line VV in FIG. 2A) showing the wiring board according to the first embodiment. [Figure 6] 6(a) to 6(e) are cross-sectional views showing the method for manufacturing the wiring board according to the first embodiment. [Figure 7] FIG. 7 is a plan view showing the image display device according to the first embodiment. [Figure 8A] FIG. 8A is a plan view (corresponding to FIG. 2A) showing a modified example of the wiring board according to the first embodiment. [Figure 8B] FIG. 8B is a plan view (corresponding to FIG. 2B) showing a modified example of the wiring board according to the first embodiment. [Figure 9A] FIG. 9A is an enlarged plan view (corresponding to FIG. 2A) showing a wiring board according to the second embodiment. [Figure 9B] FIG. 9B is an enlarged plan view (corresponding to FIG. 2B) showing the wiring board according to the second embodiment. [Figure 10] 10(a) to 10(d) are plan views showing modified examples of the isolated pattern of the wiring substrate according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] First embodiment First, the first embodiment will be described with reference to Figures 1 to 7. Figures 1 to 7 are diagrams showing the first embodiment.

[0021] The figures shown below are schematic illustrations. Therefore, the size and shape of each part are appropriately exaggerated for ease of understanding. Furthermore, appropriate modifications can be made within the scope of the technical concept. In the figures shown below, identical parts are denoted by the same reference numerals, and some detailed descriptions may be omitted. Furthermore, the numerical values, such as dimensions, and material names of each component described in this specification are examples of embodiments, and are not limited to these and may be selected and used as appropriate. In this specification, terms specifying shapes or geometric conditions, such as parallel, orthogonal, and perpendicular, are intended to include substantially the same state in addition to their strict meanings.

[0022] In this embodiment, the "X direction" refers to a direction perpendicular to the longitudinal direction of the wiring pattern region and a direction perpendicular to the length direction corresponding to the frequency band of the antenna wiring. The "Y direction" refers to a direction perpendicular to the X direction, parallel to the longitudinal direction of the wiring pattern region, and parallel to the length direction corresponding to the frequency band of the antenna wiring. The "Z direction" refers to a direction perpendicular to both the X direction and the Y direction and parallel to the thickness direction of the wiring substrate. The "front surface" refers to the surface on the positive side of the Z direction, on which the antenna wiring is provided relative to the substrate. The "back surface" refers to the surface on the negative side of the Z direction, opposite to the surface on which the antenna wiring is provided relative to the substrate. Note that in this embodiment, the wiring pattern region 20 is described as an antenna pattern region 20 having a radio wave transmitting and receiving function (functioning as an antenna), but the wiring pattern region 20 does not necessarily have a radio wave transmitting and receiving function (functioning as an antenna).

[0023] [Wiring board configuration] The configuration of the wiring board according to this embodiment will be described with reference to Figures 1 to 5. Figures 1 to 5 are diagrams showing the wiring board according to this embodiment.

[0024] 1, a wiring board 10 according to this embodiment is to be placed on, for example, a display of an image display device. Such wiring board 10 includes a transparent substrate 11, an antenna pattern area (wiring pattern area) 20 placed on the substrate 11, and a dummy pattern area 30 placed around the antenna pattern area 20 on the substrate 11. A power supply section 40 is electrically connected to the antenna pattern area 20.

[0025] Of these, substrate 11 has a substantially rectangular shape in a plan view, with its longitudinal direction parallel to the Y direction and its lateral direction parallel to the X direction. Substrate 11 is transparent and substantially flat, with a substantially uniform thickness overall. The length L1 of substrate 11 in the longitudinal direction (Y direction) can be selected, for example, from 10 mm to 200 mm, and the length L2 of substrate 11 in the lateral direction (X direction) can be selected, for example, from 3 mm to 100 mm.

[0026] The material of substrate 11 may be any material that is transparent in the visible light range and electrically insulating. In this embodiment, the material of substrate 11 is polyethylene terephthalate, but is not limited thereto. The material of substrate 11 is preferably an organic insulating material, such as a polyester resin such as polyethylene terephthalate, an acrylic resin such as polymethyl methacrylate, a polycarbonate resin, a polyimide resin, a polyolefin resin such as cycloolefin polymer, or a cellulose resin such as triacetyl cellulose. The material of substrate 11 may also be selected appropriately from glass, ceramics, and the like depending on the application. While the illustrated example shows substrate 11 formed of a single layer, this is not limiting and multiple substrates or layers may be stacked. Substrate 11 may also be in the form of a film or a plate. Therefore, the thickness of substrate 11 is not particularly limited and can be selected appropriately depending on the application. For example, the thickness T1 (length in the Z direction, see FIG. 3 ) of substrate 11 may be in the range of 10 μm to 200 μm.

[0027] 1, there are a plurality (three) of antenna pattern regions 20 on the substrate 11, each corresponding to a different frequency band. That is, the plurality of antenna pattern regions 20 have a length (length in the Y direction) L a The lengths L of the antenna pattern area 20 are different from each other and correspond to specific frequency bands. a is longer. When wiring board 10 is disposed on, for example, a display 91 of an image display device 90 (see FIG. 7 described later), each antenna pattern area 20 of wiring board 10 may have a radio wave transmission / reception function. In this case, each antenna pattern area 20 may correspond to any of a telephone antenna, a WiFi antenna, a 3G antenna, a 4G antenna, an LTE antenna, a Bluetooth (registered trademark) antenna, an NFC antenna, etc. Alternatively, when wiring board 10 does not have a radio wave transmission / reception function, each antenna pattern area 20 may perform functions such as hovering (a function that allows a user to operate the display without directly touching it), fingerprint authentication, a heater, noise reduction (shielding), etc.

[0028] Each antenna pattern area 20 has a substantially rectangular shape in a plan view. The longitudinal direction of each antenna pattern area 20 is parallel to the Y direction, and the lateral direction of each antenna pattern area 20 is parallel to the X direction. The length L of each antenna pattern area 20 in the longitudinal direction (Y direction) is a can be selected, for example, in the range of 3 mm to 100 mm, and the width W a can be selected, for example, in the range of 1 mm to 10 mm.

[0029] The antenna pattern region 20 is composed of predetermined unit patterns 20A repeatedly arranged along a first direction (for example, the Y direction). The unit patterns 20A are also repeatedly arranged along a second direction (for example, the X direction) different from the first direction. In other words, the antenna pattern region 20 has metal wires formed in a lattice or mesh shape, and has a uniformly repeated pattern in the X and Y directions. That is, as shown in FIGS. 2A and 2B, the antenna pattern region 20 is composed of repeated L-shaped unit patterns 20A (shaded portions in FIGS. 2A and 2B) each consisting of a portion extending in the X direction (a portion of the antenna connecting wiring 22 described later) and a portion extending in the Y direction (a portion of the antenna wiring 21 described later). For this reason, in this embodiment, the pitch P in the X direction of the unit patterns 20A is a is equal to the pitch P1 of the antenna wiring 21, which will be described later, and can be set in the range of 0.01 mm to 1 mm, for example. b is equal to the pitch P2 of the antenna connecting wiring 22 described later, and can be set in the range of 0.01 mm or more and 1 mm or less, for example.

[0030] As shown in Figures 2A and 2B, each antenna pattern area 20 includes a plurality of wirings 21, 22. In this embodiment, each antenna pattern area 20 includes a plurality of antenna wirings 21 that function as antennas, and a plurality of antenna connecting wirings 22 that connect the plurality of antenna wirings 21. Specifically, the plurality of antenna wirings 21 and the plurality of antenna connecting wirings 22 are integrated as a whole to form a regular lattice or mesh shape. Each antenna wiring 21 extends in a direction (Y direction) corresponding to the frequency band of the antenna, and each antenna connecting wiring 22 extends in a direction (X direction) perpendicular to the antenna wiring 21. The antenna wiring 21 has a length L corresponding to a predetermined frequency band. a(the length of the antenna pattern region 20 described above), it mainly functions as an antenna. On the other hand, the antenna connecting wiring 22 connects these antenna wirings 21 together, thereby playing a role in preventing problems such as breakage of the antenna wiring 21 and loss of electrical connection between the antenna wiring 21 and the power supply section 40.

[0031] In each antenna pattern region 20, a plurality of openings 23 are formed by being surrounded by adjacent antenna wirings 21 and adjacent antenna connecting wirings 22. The antenna wirings 21 and the antenna connecting wirings 22 are arranged at equal intervals. That is, the plurality of antenna wirings 21 are arranged at equal intervals, and the pitch P1 (see FIG. 2A) therebetween may be, for example, in the range of 0.01 mm to 1 mm. The plurality of antenna connecting wirings 22 are arranged at equal intervals, and the pitch P2 (see FIG. 2A) therebetween may be, for example, in the range of 0.01 mm to 1 mm. Since the plurality of antenna wirings 21 and the plurality of antenna connecting wirings 22 are arranged at equal intervals, the size of the openings 23 within each antenna pattern region 20 is uniform, making the antenna pattern region 20 less visible to the naked eye. The pitch P1 of the antenna wirings 21 is equal to the pitch P2 of the antenna connecting wirings 22. Therefore, each opening 23 is substantially square in plan view, and the transparent substrate 11 is exposed through each opening 23. Therefore, by increasing the area of ​​each opening 23, the transparency of the wiring substrate 10 as a whole can be improved. The length L3 (see FIG. 2A) of one side of each opening 23 can be set to, for example, a range of 0.01 mm or more and 1 mm or less. While the antenna wirings 21 and the antenna connecting wirings 22 are orthogonal to each other, this is not limiting and they may intersect at an acute or obtuse angle. Each opening 23 may have a shape such as a substantially rectangular shape in a plan view. While the shape of the openings 23 is preferably the same shape and size over the entire surface, it does not have to be uniform over the entire surface, and may vary depending on the location.

[0032] As shown in FIG. 3, each antenna wiring 21 has a substantially rectangular or square cross section (X-direction cross section) perpendicular to its longitudinal direction. In this case, the cross-sectional shape of the antenna wiring 21 is substantially uniform along the longitudinal direction (Y-direction) of the antenna wiring 21. Also, as shown in FIG. 4, the cross-sectional shape of each antenna connecting wiring 22 perpendicular to the longitudinal direction (Y-direction cross section) is substantially rectangular or square, and is substantially the same as the cross-sectional shape (X-direction cross section) of the antenna wiring 21 described above. In this case, the cross-sectional shape of the antenna connecting wiring 22 is substantially uniform along the longitudinal direction (X-direction) of the antenna connecting wiring 22. The cross-sectional shapes of the antenna wiring 21 and the antenna connecting wiring 22 do not necessarily have to be substantially rectangular or square, and may be, for example, a substantially trapezoidal shape in which the front side (positive side in the Z-direction) is narrower than the back side (negative side in the Z-direction), or a shape with curved side surfaces on both widthwise sides.

[0033] In this embodiment, the line width W1 (length in the X direction, see FIG. 3) of the antenna wiring 21 and the line width W2 (length in the Y direction, see FIG. 4) of the antenna connecting wiring 22 are not particularly limited and can be appropriately selected depending on the application. For example, the line width W1 of the antenna wiring 21 can be selected from the range of 0.1 μm to 5.0 μm, and the line width W2 of the antenna connecting wiring 22 can be selected from the range of 0.1 μm to 5.0 μm. Furthermore, the height H1 (length in the Z direction, see FIG. 3) of the antenna wiring 21 and the height H2 (length in the Z direction, see FIG. 4) of the antenna connecting wiring 22 are not particularly limited and can be appropriately selected depending on the application, for example, can be selected from the range of 0.1 μm to 5.0 μm.

[0034] The material of the antenna wiring 21 and the antenna connecting wiring 22 may be any conductive metal material. In the present embodiment, the material of the antenna wiring 21 and the antenna connecting wiring 22 is copper, but is not limited to this. The material of the antenna wiring 21 and the antenna connecting wiring 22 may be, for example, a metal material (including an alloy) such as gold, silver, copper, platinum, tin, aluminum, iron, or nickel.

[0035] 1 again, the dummy pattern area 30 is provided so as to surround the periphery of each antenna pattern area 20, and is formed so as to surround the entire circumferential area (positive side in the X direction, negative side in the X direction, positive side in the Y direction) of each antenna pattern area 20 except for the side of the power supply unit 40 (negative side in the Y direction). In this case, the dummy pattern area 30 is arranged on the substrate 11 over almost the entire area except for the antenna pattern area 20 and the power supply unit 40. Unlike the antenna pattern area 20, this dummy pattern area 30 does not actually function as an antenna.

[0036] As shown in FIGS. 2A and 2B, the dummy pattern region 30 is composed of predetermined dummy unit patterns 30A (shaded areas in FIGS. 2A and 2B) that are repeatedly arranged. These dummy unit patterns 30A are L-shaped and repeatedly arranged along a first direction (e.g., the Y direction) and a second direction (e.g., the X direction). In other words, the dummy pattern region 30 is composed of repeated dummy wirings 30a having a predetermined unit pattern. That is, the dummy pattern region 30 includes a plurality of dummy wirings 30a of the same shape, and each dummy wiring 30a is electrically independent from the antenna pattern region 20 (the antenna wiring 21 and the antenna connecting wiring 22) and the power supply section 40. The plurality of dummy wirings 30a are regularly arranged throughout the entire dummy pattern region 30. Each of these dummy wirings 30a is formed of metal wires in a lattice or mesh shape, and has a uniformly repeated pattern in the X and Y directions. 2A and 2B, each dummy wiring 30a has a first dummy wiring portion 31 extending in the Y direction and a second dummy wiring portion 32 extending in the X direction. Of these, the first dummy wiring portion 31 has a predetermined length L4 (length in the Y direction), and the second dummy wiring portion 32 has a predetermined length L5 (length in the X direction), which are equal to each other (L4=L5).

[0037] In this embodiment, the shape of the dummy unit pattern 30A is the same as the shape of the unit pattern 20A. In other words, the shape of the dummy wiring 30a is the same as the shape of the unit pattern 20A of the above-mentioned antenna pattern region 20. In this way, since the shape of the dummy unit pattern 30A is the same as the shape of the unit pattern 20A, it is possible to make it difficult to visually recognize the difference between the antenna pattern region 20 and the dummy pattern region 30, and it is possible to make the antenna pattern region 20 arranged on the substrate 11 less visible.

[0038] In the dummy pattern region 30, a plurality of openings 33 are formed by being surrounded by adjacent first dummy wiring portions 31 and adjacent second dummy wiring portions 32. The first dummy wiring portions 31 and the second dummy wiring portions 32 are arranged at equal intervals. By arranging the plurality of first dummy wiring portions 31 and the plurality of second dummy wiring portions 32 at equal intervals in this manner, there is no variation in the size of the openings 33 within the dummy pattern region 30, and the dummy pattern region 30 can be made difficult to see with the naked eye.

[0039] The pitch of the first dummy wiring portions 31 may be equal to the pitch P1 of the antenna wiring 21 (see FIG. 2A), and the pitch of the second dummy wiring portions 32 may be equal to the pitch P2 of the antenna connecting wiring 22 (see FIG. 2A). Therefore, each opening 33 has a substantially square shape in a plan view, and the transparent substrate 11 is exposed through each opening 33. Therefore, by increasing the area of ​​each opening 33, the transparency of the wiring substrate 10 as a whole can be improved. While the first dummy wiring portions 31 and the second dummy wiring portions 32 are orthogonal to each other, they may intersect at an acute or obtuse angle. Furthermore, each opening 33 may have a shape such as a substantially rectangular shape in a plan view. The shape of the openings 33 is preferably the same across the entire surface, but it need not be uniform across the entire surface; for example, it may vary depending on the location.

[0040] 2A, the antenna pattern region 20 and the dummy pattern region 30 are adjacent to each other in the Y direction. Near the boundary between the antenna pattern region 20 and the dummy pattern region 30, a first dummy wiring portion 31 is formed on an extension of the antenna wiring 21. For this reason, it is difficult to visually recognize the difference between the antenna pattern region 20 and the dummy pattern region 30 in the Y direction.

[0041] 2B, the antenna pattern region 20 and the dummy pattern region 30 are adjacent to each other in the X direction. Near the boundary between the antenna pattern region 20 and the dummy pattern region 30, a second dummy wiring portion 32 is formed on an extension of the antenna connecting wiring 22. Therefore, the difference between the antenna pattern region 20 and the dummy pattern region 30 in the X direction is difficult to visually recognize.

[0042] In this embodiment, the distance G1 between the antenna pattern region 20 and the dummy pattern region 30 in the Y direction (first direction) is set to be equal to the pitch P of the unit patterns 20A in the Y direction (first direction). b The spacing G1 is greater than or equal to 0.01 times and less than or equal to 0.2 times the pitch P b By making the interval G1 0.01 times or more, it is possible to effectively prevent the dummy wirings 30a in the dummy pattern area 30 from affecting the transmission and reception of radio waves in the antenna pattern area 20. Therefore, it is possible to prevent the antenna performance from being deteriorated. b By making the difference between the antenna pattern region 20 and the dummy pattern region 30 less than 0.2 times the Y direction, it is possible to make the difference between the antenna pattern region 20 and the dummy pattern region 30 less visible to the naked eye.

[0043] Similarly, in the X direction (second direction), the interval G2 between the antenna pattern region 20 and the dummy pattern region 30 is the pitch P of the unit patterns 20A in the X direction (second direction). aThe interval G2 is 0.01 times or more and 0.2 times or less of the pitch P1. By making the interval G2 0.01 times or more of the pitch P1, it is possible to effectively prevent the dummy wiring 30a of the dummy pattern area 30 from affecting the transmission and reception of radio waves in the antenna pattern area 20. This makes it possible to prevent the antenna performance from being degraded. In addition, when the interval G2 is 0.01 times or more of the pitch P a By making the gap G1 equal to or smaller than 0.2 times, it is possible to make it difficult to visually recognize the difference between the antenna pattern region 20 and the dummy pattern region 30 in the X direction. In this case, the gap G1 may be equal to the gap G2 (G1=G2).

[0044] 5, the first dummy wiring portion 31 of each dummy wiring 30a has a cross section (X-direction cross section) perpendicular to its longitudinal direction (Y-direction) that is substantially rectangular or square. Also, as shown in Fig. 4, the second dummy wiring portion 32 of each dummy wiring 30a has a cross section (Y-direction cross section) perpendicular to its longitudinal direction (X-direction) that is substantially rectangular or square. In this case, the cross-sectional shape of the first dummy wiring portion 31 is substantially the same as the cross-sectional shape of the antenna wiring 21, and the cross-sectional shape of the second dummy wiring portion 32 is substantially the same as the cross-sectional shape of the antenna connecting wiring 22.

[0045] In this embodiment, the line width W3 (length in the X direction, see FIG. 5) of the first dummy wiring portion 31 is approximately the same as the line width W1 of the antenna wiring 21, and the line width W4 (length in the Y direction, see FIG. 4) of the second dummy wiring portion 32 is approximately the same as the line width W2 of the antenna connecting wiring 22. In addition, the height H3 (length in the Z direction, see FIG. 5) of the first dummy wiring portion 31 and the height H4 (length in the Z direction, see FIG. 4) of the second dummy wiring portion 32 are also approximately the same as the height H1 of the antenna wiring 21 and the height H2 of the antenna connecting wiring 22, respectively.

[0046] The dummy wiring 30 a may be made of the same metal material as the antenna wiring 21 and the antenna connecting wiring 22 .

[0047] In this embodiment, the antenna pattern region 20 and the dummy pattern region 30 each have a predetermined aperture ratio. The aperture ratio of the antenna pattern region 20 and the dummy pattern region 30 can be set to, for example, a range of 85% to 99.9%.

[0048] Furthermore, the overall aperture ratio of the antenna pattern region 20 and the dummy pattern region 30 (the combined aperture ratio of the antenna pattern region 20 and the dummy pattern region 30) can be set to, for example, a range of 87% or more and less than 100%. By setting the overall aperture ratio A3 of the wiring board 10 in this range, the conductivity and transparency of the wiring board 10 can be ensured.

[0049] The aperture ratio refers to the percentage (%) of the area of ​​the opening area (the area where there are no metal parts such as the antenna wiring 21, the antenna connecting wiring 22, the dummy wiring 30a, etc., and where the substrate 11 is exposed) in a unit area of ​​a specified area (the antenna pattern area 20, the dummy pattern area 30, or the antenna pattern area 20 and the dummy pattern area 30).

[0050] Referring again to FIG. 1 , the power supply unit 40 is electrically connected to the antenna pattern area 20. The power supply unit 40 is made of a conductive thin plate member having a substantially rectangular shape. The longitudinal direction of the power supply unit 40 is parallel to the X direction, and the lateral direction of the power supply unit 40 is parallel to the Y direction. The power supply unit 40 is disposed at the longitudinal end (the end on the negative side in the Y direction) of the substrate 11. The power supply unit 40 may be made of a metal material (including an alloy containing metal), such as gold, silver, copper, platinum, tin, aluminum, iron, or nickel. When the wiring board 10 is incorporated into an image display device 90 (see FIG. 7 ), the power supply unit 40 is electrically connected to a wireless communication circuit 92 of the image display device 90. Note that the power supply unit 40 is provided on the surface of the substrate 11, but this is not limiting, and a part or all of the power supply unit 40 may be located outside the periphery of the substrate 11.

[0051] [Method of manufacturing wiring board] Next, a method for manufacturing a wiring board according to this embodiment will be described with reference to Figures 6(a) to 6(e). Figures 6(a) to 6(e) are cross-sectional views illustrating the method for manufacturing a wiring board according to this embodiment.

[0052] First, a transparent substrate 11 is prepared.

[0053] Next, as shown in FIG. 6(a), an antenna pattern region 20 including a plurality of antenna wirings 21 and a plurality of antenna connecting wirings 22, and a dummy pattern region 30 including a plurality of dummy wirings 30a arranged around the antenna pattern region 20 and electrically independent from the antenna wirings 21 and the antenna connecting wirings 22 are formed on the substrate 11. At this time, first, a metal foil 51 is laminated over substantially the entire surface of the substrate 11. In this embodiment, the thickness of the metal foil 51 may be 0.1 μm or more and 5.0 μm or less. In this embodiment, the metal foil 51 may contain copper.

[0054] 6(b), a photo-curable insulating resist 52 is applied to almost the entire surface of the metal foil 51. Examples of the photo-curable insulating resist 52 include organic resins such as acrylic resins and epoxy resins.

[0055] 6(c), an insulating layer 54 is formed by photolithography. In this case, the photo-curable insulating resist 52 is patterned by photolithography to form the insulating layer 54 (resist pattern). At this time, the insulating layer 54 is formed so that the metal foil 51 corresponding to the antenna wiring 21, the antenna connecting wiring 22, and the dummy wiring 30a is exposed.

[0056] 6(d), the metal foil 51 on the surface of the substrate 11 is removed by performing a wet treatment using ferric chloride, cupric chloride, a strong acid such as sulfuric acid or hydrochloric acid, persulfate, hydrogen peroxide, an aqueous solution of these, or a combination of these, to etch the metal foil 51 so that the surface of the substrate 11 is exposed.

[0057] 6(e), the insulating layer 54 is removed by wet treatment using a permanganate solution, N-methyl-2-pyrrolidone, an acid or alkaline solution, or dry treatment using oxygen plasma.

[0058] In this way, a wiring board 10 is obtained that has a substrate 11 and an antenna pattern region 20 and a dummy pattern region 30 arranged on the substrate 11. In this case, the antenna pattern region 20 includes the antenna wiring 21 and the antenna connecting wiring 22, and the dummy pattern region 30 includes the dummy wiring 30a.

[0059] [Operation of this embodiment] Next, the operation of the wiring board having such a configuration will be described.

[0060] As shown in FIG. 7 , the wiring board 10 is incorporated into an image display device 90 having a display 91. The wiring board 10 is disposed on the display 91. Examples of such image display devices 90 include mobile terminal devices such as smartphones and tablets. The antenna pattern region 20 of the wiring board 10 is electrically connected to a wireless communication circuit 92 of the image display device 90 via a power supply unit 40. In this way, radio waves of a predetermined frequency can be transmitted and received via the antenna pattern region 20, and communication can be performed using the image display device 90. The dummy pattern region 30 is separated from the antenna pattern region 20 and is electrically independent. Therefore, even if the dummy pattern region 30 is provided, it does not affect the transmission and reception of radio waves.

[0061] According to the present embodiment, wiring board 10 has transparent substrate 11 and antenna pattern region 20 that is disposed on substrate 11 and includes a plurality of antenna wirings 21 and a plurality of antenna connecting wirings 22, thereby ensuring the transparency of wiring board 10. As a result, when wiring board 10 is disposed on display 91, display 91 can be viewed through opening 23 of antenna pattern region 20, and the visibility of display 91 is not hindered.

[0062] Moreover, a dummy pattern region 30 including a plurality of dummy wirings 30a electrically independent from the antenna wiring 21 and the antenna connecting wiring 22 is arranged around the antenna pattern region 20. The antenna pattern region 20 is composed of predetermined unit patterns 20A repeatedly arranged along the Y direction, and the interval G1 between the antenna pattern region 20 and the dummy pattern region 30 in the Y direction is set to be equal to the pitch P of the unit patterns 20A in the Y direction. b In this way, the interval G1 is equal to or greater than 0.01 times and equal to or less than 0.2 times the pitch P b By making the interval G1 0.01 times or more, it is possible to effectively prevent the dummy wirings 30a in the dummy pattern area 30 from affecting the transmission and reception of radio waves in the antenna pattern area 20. Therefore, it is possible to prevent the antenna performance from being deteriorated. b By making the width 0.2 times or less, the boundary between the antenna pattern area 20 and the dummy pattern area 30 can be made unclear in the Y direction. This makes it possible to make the antenna pattern area 20 and the dummy pattern area 30 less visible on the surface of the display 91, and makes it difficult for a user of the image display device 90 to recognize the antenna pattern area 20 and the dummy pattern area 30 with the naked eye.

[0063] Here, in order to prevent the antenna performance from being degraded, it is preferable to increase the distance between the antenna pattern region 20 and the dummy pattern region 30. On the other hand, if the distance between the antenna pattern region 20 and the dummy pattern region 30 is increased, there is a possibility that the boundary between the antenna pattern region 20 and the dummy pattern region 30 becomes clear. In contrast, according to this embodiment, the distance G1 between the antenna pattern region 20 and the dummy pattern region 30 in the Y direction is set to be equal to or smaller than the pitch P of the unit patterns 20A in the Y direction. b This makes it possible to ensure the transparency of the wiring board 10 while suppressing a decrease in antenna performance.

[0064] Furthermore, according to this embodiment, the distance G2 between the antenna pattern region 20 and the dummy pattern region 30 in the X direction is set to be equal to the pitch P of the unit patterns 20A in the X direction. a In this way, the interval G2 is equal to or greater than 0.01 times and equal to or less than 0.2 times the pitch P a By making the interval G2 equal to or greater than 0.01 times the pitch P, it is possible to effectively prevent the dummy wirings 30a in the dummy pattern area 30 from affecting the transmission and reception of radio waves in the antenna pattern area 20. This makes it possible to prevent the antenna performance from being degraded. a By making the distance 0.2 times or less, the boundary between the antenna pattern area 20 and the dummy pattern area 30 can be made unclear in the X direction. This makes it possible to make the antenna pattern area 20 and the dummy pattern area 30 less visible on the surface of the display 91, and makes it difficult for a user of the image display device 90 to recognize the antenna pattern area 20 and the dummy pattern area 30 with the naked eye.

[0065] Furthermore, according to this embodiment, the shape of the dummy unit pattern 30A is the same as the shape of the unit pattern 20A. This makes it possible to further blur the boundary between the antenna pattern area 20 and the dummy pattern area 30, making it difficult to recognize the antenna pattern area 20 and the dummy pattern area 30 with the naked eye on the surface of the display 91.

[0066] In the above-described embodiment, an example has been described in which the antenna wiring 21 extends in the Y direction and the antenna connecting wiring 22 extends in the X direction, but this is not limiting. For example, as shown in Figures 8A and 8B, the antenna wiring 21 and the antenna connecting wiring 22 may be non-parallel to both the X direction and the Y direction, respectively. In this case, the antenna wiring 21 and the antenna connecting wiring 22 intersect at an angle, and each opening 23 is formed in a diamond shape in plan view. The antenna wiring 21 and the antenna connecting wiring 22 are non-parallel to both the X direction and the Y direction, respectively.

[0067] Furthermore, the first dummy wiring portions 31 of the dummy pattern region 30 may extend parallel to the antenna wiring 21. Similarly, the second dummy wiring portions 32 of the dummy pattern region 30 may extend parallel to the antenna connecting wiring 22.

[0068] In this modification, the distance G1 between the antenna pattern region 20 and the dummy pattern region 30 in the Y direction is also equal to the pitch P b In addition, the distance G2 between the antenna pattern region 20 and the dummy pattern region 30 in the X direction is 0.01 to 0.2 times the pitch P of the unit patterns 20A in the X direction. aThe ratio is set to 0.01 to 0.2 times the value of the antenna pattern area 20. This makes it possible to prevent a decrease in antenna performance. Furthermore, the boundary between the antenna pattern area 20 and the dummy pattern area 30 can be made unclear. This makes it possible to make the antenna pattern area 20 and the dummy pattern area 30 less visible on the surface of the display 91, making it difficult for a user of the image display device 90 to recognize the antenna pattern area 20 and the dummy pattern area 30 with the naked eye.

[0069] Second embodiment Next, a second embodiment will be described with reference to Figures 9A and 9B. The second embodiment shown in Figures 9A and 9B differs from the first embodiment mainly in that the dummy pattern region 30 is composed of a plurality of isolated patterns 30B that are independent of each other. In Figures 9A and 9B, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0070] 9A and 9B, in this embodiment, the dummy pattern region 30 is composed of a plurality of mutually independent isolated patterns 30B. The isolated patterns 30B are composed of dummy wiring 30a having a first dummy wiring portion 31 extending in the Y direction and a second dummy wiring portion 32 extending in the X direction.

[0071] Also in this embodiment, an opening 33 is formed in the isolated pattern 30B by being surrounded by adjacent first dummy wiring portions 31 and adjacent second dummy wiring portions 32. In the illustrated example, two openings 33 are formed in the isolated pattern 30B. Each opening 33 has a substantially square shape in a plan view. In the isolated pattern 30B, the openings 33 are arranged along the X direction or the Y direction. For example, as shown in FIG. 9A , in the isolated pattern 30B adjacent to the antenna pattern region 20 in the Y direction, the openings 33 are arranged along the X direction. As shown in FIG. 9B , in the isolated pattern 30B adjacent to the antenna pattern region 20 in the X direction, the openings 33 are arranged along the Y direction. However, this is not limited thereto, and the openings 33 in the isolated pattern 30B adjacent to the antenna pattern region 20 in the Y direction may be arranged along the Y direction, or the openings 33 in the isolated pattern 30B adjacent to the antenna pattern region 20 in the X direction may be arranged along the X direction. The shapes of the isolated patterns 30B may be the same as each other. The isolated patterns 30B may be arranged regularly or irregularly. Furthermore, the number of openings 33 formed in the isolated pattern 30B may be one, or three or more openings 33 may be formed.

[0072] The isolated pattern 30B includes a dummy unit pattern 30A. The shape of the dummy unit pattern 30A is the same as the shape of the unit pattern 20A. This makes it possible to further blur the boundary between the antenna pattern region 20 and the dummy pattern region 30. Although not shown, the shape of the dummy unit pattern 30A and the shape of the unit pattern 20A may be different from each other.

[0073] In this embodiment, the length of the dummy wiring 30a of the isolated pattern 30B (hereinafter referred to as the length L 30B The length of the antenna wiring 21 and the antenna connecting wiring 22 of the unit pattern 20A (hereinafter referred to as length L 20AIn this specification, the length L of the dummy wiring 30a is 4.0 times or less. 30B is the total length of each first dummy wiring portion 31 of the dummy wiring 30a and the length of each second dummy wiring portion 32 of the dummy wiring 30a. In the example shown in FIG. 9A, L 30B =3×L 31 +2×L 32 In this specification, the length L of the antenna wiring 21 and the antenna connecting wiring 22 of the unit pattern 20A is 20A is the sum of the length of the antenna wiring 21 of the unit pattern 20A and the length of the antenna connecting wiring 22 of the unit pattern 20A, and in the example shown in FIG. 9A, L 21A =L 21 +L 22 In this way, the length L of the dummy wiring 30a of the isolated pattern 30B 30B However, the length L of the antenna wiring 21 and the antenna connecting wiring 22 of the unit pattern 20A is 20A By making the distance 4.0 times or less, it is possible to effectively prevent the dummy wiring 30a of the dummy pattern area 30 from affecting the transmission and reception of radio waves in the antenna pattern area 20. This makes it possible to prevent a decrease in antenna performance. In addition, it is possible to make it difficult to visually recognize the difference between the antenna pattern area 20 and the dummy pattern area 30.

[0074] In addition, in the Y direction (first direction), the interval G3 between the isolated patterns 30B is the pitch P b The interval G3 is 0.01 times or more and 0.2 times or less than the pitch P b By setting the gap G3 to 0.01 times or more, it is possible to prevent the antenna performance from being degraded. b By making the difference 0.2 times or less, it is possible to make the difference between the isolated patterns 30B less visible in the Y direction.

[0075] Similarly, in the X direction (second direction), the interval G4 between the isolated patterns 30B is equal to the pitch Pa The interval G4 is 0.01 times or more and 0.2 times or less than the pitch P a By setting the gap G4 to 0.01 times or more, it is possible to prevent the antenna performance from being degraded. a By making the difference 0.2 times or less, it is possible to make it difficult to visually recognize the difference between the isolated patterns 30B in the X direction.

[0076] In this embodiment, too, the wiring board 10 can be fabricated by the method shown in FIGS. 6(a) to 6(e).

[0077] As described above, according to this embodiment, the length L of the dummy wiring 30a of the isolated pattern 30B 30B However, the length L of the antenna wiring 21 and the antenna connecting wiring 22 of the unit pattern 20A is 20A The distance between the dummy wirings 30a in the dummy pattern area 30 and the dummy pattern area 30 is 4.0 times or less. This effectively prevents the dummy wirings 30a in the dummy pattern area 30 from affecting the transmission and reception of radio waves in the antenna pattern area 20. This prevents the antenna performance from deteriorating. In addition, it is possible to make it difficult to visually recognize the difference between the antenna pattern area 20 and the dummy pattern area 30.

[0078] In addition, in the Y direction (first direction), the interval G3 between the isolated patterns 30B is set to be equal to the pitch P b In this way, the interval G3 is equal to or greater than 0.01 times and equal to or less than 0.2 times the pitch P b By setting the gap G3 to 0.01 times or more, it is possible to prevent the antenna performance from being degraded. b By making the difference 0.2 times or less, it is possible to make the difference between the isolated patterns 30B less visible in the Y direction.

[0079] Furthermore, according to this embodiment, the distance G4 between the isolated patterns 30B in the X direction (second direction) is set to be equal to the pitch P of the unit patterns 20A in the X direction (second direction). aIn this way, the interval G4 is equal to or greater than 0.01 times and equal to or less than 0.2 times the pitch P a By setting the gap G4 to 0.01 times or more, it is possible to prevent the antenna performance from being degraded. a By making the difference 0.2 times or less, it is possible to make it difficult to visually recognize the difference between the isolated patterns 30B in the X direction.

[0080] Furthermore, according to this embodiment, the isolated pattern 30B includes a dummy unit pattern 30A, and the shape of the dummy unit pattern 30A is the same as the shape of the unit pattern 20A. This makes it possible to further blur the boundary between the antenna pattern region 20 and the dummy pattern region 30, and to make the antenna pattern region 20 and the dummy pattern region 30 difficult to recognize with the naked eye on the surface of the display 91.

[0081] In the above-described embodiment, the openings 33 of the isolated pattern 30B are arranged along the X direction or the Y direction, but the present invention is not limited to this. For example, as shown in Fig. 10(a), the openings 33 may be arranged with a shift in the X direction and the Y direction.

[0082] In the above-described embodiment, an example has been described in which the first dummy wiring portions 31 extend in the Y direction and the second dummy wiring portions 32 extend in the X direction, but this is not limiting. For example, as shown in Figures 10(b)-(c), the first dummy wiring portions 31 and the second dummy wiring portions 32 may be non-parallel to both the X direction and the Y direction, respectively. In this case, the first dummy wiring portions 31 and the second dummy wiring portions 32 may intersect at an angle, and each opening 33 may be formed in a diamond shape in a plan view.

[0083] As shown in FIG. 10(b), the openings 33 of the isolated pattern 30B may be arranged along the X direction (or the Y direction (not shown)), or as shown in FIG. 10(c), the openings 33 may be arranged with a shift in the X direction and the Y direction.

[0084] Although not shown, the antenna wiring 21 in the antenna pattern region 20 may extend parallel to or non-parallel to the first dummy wiring portion 31. Similarly, the antenna connecting wiring 22 in the antenna pattern region 20 may extend parallel to or non-parallel to the second dummy wiring portion 32.

[0085] 10(d), the first dummy wiring portion 31 may include a first portion 31a that is non-parallel to both the X direction and the Y direction, and a second portion 31b that is non-parallel to both the X direction and the Y direction and diagonally intersects with the first portion 31a. Each opening 33 may be formed in a substantially regular hexagonal shape in plan view. In this case, the openings 33 may be arranged with a shift in the X direction and the Y direction, or, although not shown, the openings 33 may be arranged along the X direction or the Y direction, respectively. Furthermore, although not shown, the openings 33 may be formed in a polygonal shape, such as a substantially equilateral triangle or a substantially pentagonal shape, in plan view.

[0086] The components disclosed in the above-described embodiment and each modification may be combined as needed, or some components may be omitted from all the components shown in the above-described embodiment and each modification. [Explanation of symbols]

[0087] 10. Wiring board 11 Circuit Board 20 Antenna pattern area 20A unit pattern 21 Antenna wiring 22 Antenna connection wiring 30 Dummy pattern area 30A dummy unit pattern 30B Isolated Pattern 30a dummy wiring 31 First dummy wiring section 32 Second dummy wiring section

Claims

1. A wiring board, a transparent substrate; a wiring pattern area disposed on the substrate and including a plurality of wirings; a dummy pattern area that is arranged around the wiring pattern area and includes a plurality of dummy wirings that are electrically independent from the wirings; the wiring pattern region is composed of predetermined unit patterns repeatedly arranged along a first direction, a distance between the wiring pattern region and the dummy pattern region in the first direction is equal to or greater than 0.01 times and equal to or less than 0.2 times a pitch of the unit patterns in the first direction; The wiring that forms the outer edge of the wiring pattern region is defined as a peripheral wiring, the dummy wiring arranged around the outer wiring and constituting the inner edge of the dummy pattern region is defined as an inner wiring; the inner circumferential wiring facing the outer circumferential wiring in the first direction is defined as a first inner circumferential wiring, When the outer peripheral wiring facing the first inner peripheral wiring in the first direction is defined as a first outer peripheral wiring, a wiring substrate, wherein the first inner peripheral wiring extends along the first outer peripheral wiring so that the distance in the first direction between the first inner peripheral wiring and the first outer peripheral wiring is 0.01 to 0.2 times the pitch of the unit patterns in the first direction.

2. 2. The wiring board according to claim 1, wherein the unit patterns are repeatedly arranged along a second direction different from the first direction, and in the second direction, the spacing between the wiring pattern region and the dummy pattern region is 0.01 times or more and 0.2 times or less the pitch of the unit patterns in the second direction.

3. 3. The wiring board according to claim 1, wherein the dummy pattern region is made up of predetermined dummy unit patterns arranged repeatedly, and the shape of the dummy unit patterns is the same as the shape of the unit patterns.

4. A wiring board, a transparent substrate; a wiring pattern area disposed on the substrate and including a plurality of wirings; a dummy pattern area that is arranged around the wiring pattern area and includes a plurality of dummy wirings that are electrically independent from the wirings; the wiring pattern region is composed of predetermined unit patterns repeatedly arranged along a first direction, the dummy pattern region is composed of a plurality of isolated patterns that are independent of each other, The length of the dummy wiring of the isolated pattern is 4.0 times or less the length of the wiring of the unit pattern, A wiring board, wherein the distance between the isolated patterns in the first direction is 0.01 to 0.2 times the pitch of the unit patterns in the first direction.

5. 5. The wiring board according to claim 4, wherein the distance between the wiring pattern region and the dummy pattern region in the first direction is 0.01 to 0.2 times the pitch of the unit patterns in the first direction.

6. 6. The wiring board according to claim 4, wherein the unit patterns are repeatedly arranged along a second direction different from the first direction, and the spacing between the isolated patterns in the second direction is 0.01 to 0.2 times the pitch of the unit patterns in the second direction.

7. 7. The wiring board according to claim 6, wherein the distance between the wiring pattern region and the dummy pattern region in the second direction is 0.01 to 0.2 times the pitch of the unit patterns in the second direction.

8. 8. The wiring board according to claim 4, wherein the isolated pattern includes a dummy unit pattern, and a shape of the dummy unit pattern is the same as a shape of the unit pattern.

9. The wiring board according to claim 1 , having a radio wave transmitting and receiving function.

10. 10. The wiring board according to claim 1, wherein the region between the wiring pattern region and the dummy pattern region extends in a zigzag pattern.

11. A method for manufacturing a wiring substrate, providing a transparent substrate; forming, on the substrate, a wiring pattern region including a plurality of wirings, and a dummy pattern region including a plurality of dummy wirings arranged around the wiring pattern region and electrically independent from the wirings; the wiring pattern region is composed of predetermined unit patterns repeatedly arranged along a first direction, a distance between the wiring pattern region and the dummy pattern region in the first direction is equal to or greater than 0.01 times and equal to or less than 0.2 times a pitch of the unit patterns in the first direction; The wiring that forms the outer edge of the wiring pattern region is defined as a peripheral wiring, the dummy wiring arranged around the outer wiring and constituting the inner edge of the dummy pattern region is defined as an inner wiring; the inner circumferential wiring facing the outer circumferential wiring in the first direction is defined as a first inner circumferential wiring, When the outer peripheral wiring facing the first inner peripheral wiring in the first direction is defined as a first outer peripheral wiring, a first inner peripheral wiring extending along the first outer peripheral wiring such that a distance in the first direction between the first inner peripheral wiring and the first outer peripheral wiring is 0.01 to 0.2 times the pitch of the unit patterns in the first direction.

12. A method for manufacturing a wiring substrate, providing a transparent substrate; forming, on the substrate, a wiring pattern region including a plurality of wirings, and a dummy pattern region including a plurality of dummy wirings arranged around the wiring pattern region and electrically independent from the wirings; the wiring pattern region is composed of predetermined unit patterns repeatedly arranged along a first direction, the dummy pattern region is composed of isolated patterns that are independent of each other, the length of the isolated pattern is 4.0 times or less the length of the unit pattern; a distance between the isolated patterns in the first direction that is 0.01 to 0.2 times the pitch of the unit patterns in the first direction;

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