WO2022130816A1 - Elastic mounting substrate - Google Patents

Abstract

An elastic mounting substrate 1 comprises: an elastic base material 10; elastic wirings provided on one principal surface 10a side of the elastic base material 10; and an electronic component 40 electrically connected to the elastic wirings. The elastic wirings include: first elastic wiring 21a (21b, 21c, 21d); and second elastic wiring 31a (31b, 31c, 31d) connected by a connection part 51a (51b, 51c, 51d) so as to overlap with one end 21aa (21ba, 21ca, 21da) side of the first elastic wiring 21a (21b, 21c, 21d). The electronic component 40 has a terminal 41a (41b, 41c, 41d) that protrudes in a first direction D1 and is electrically connected to the other end 21ab (21bb, 21cb, 21db) side of the first elastic wiring 21a (21b, 21c, 21d). The terminal 41a (41b, 41c, 41d), the first elastic wiring 21a (21b, 21c, 21d), and the second elastic wiring 31a (31b, 31c, 31d) constitute a wiring route 61a (61b, 61c, 61d) toward the first direction D1. A plurality of wiring routes (61a, 61b, 61c, 61d) are provided so as to be side-by-side in a second direction D2 orthogonal to the first direction D1. For two wiring routes 61a and 61b (61b and 61c, 61c and 61d) that are adjacent in the second direction D2, the inter-wiring distance K1 (K2, K3), which is the shortest distance between the elastic wirings in the second direction D2 in a region between the connection parts 51a and 51b (51b and 51c, 51c and 51d), is greater than the inter-terminal distance P1 (P2, P3), which is the shortest distance in the second direction D2 between the terminals 41a and 41b (41b and 41c, 41c and 41d).

Description

Elastic mounting board

The present invention relates to a stretchable mounting board.

In recent years, the state of a living body (for example, the human body) has been managed by acquiring and analyzing biological information using a wiring board.

When the wiring board is used in a state of being attached to a living body, the wiring board is required to have elasticity that can follow the movement of the living body. Therefore, the wiring used for such a wiring board is required to be difficult to break even if it is expanded or contracted. Since such wiring generally has a relatively high resistivity, it is required to increase the thickness of the wiring, for example, from the viewpoint of reducing the resistance.

When forming wiring, generally, the conductive paste for wiring is printed by the screen printing method, but when the conductive paste for wiring is printed thickly in order to form a thick wiring, the conductive paste is printed. Is likely to cause printing bleeding that flows in the width direction. In the wiring board, two wirings may be provided so that they partially overlap each other. However, when forming such two wirings, the thickness increases at the portion where both wirings overlap, so that printing blemishes occur. Is even more likely to occur.

As a configuration for suppressing print bleeding, Patent Document 1 states that a lower conductor is formed on an insulating substrate, an insulating layer is formed on the lower conductor, and an upper conductor intersecting the lower conductor on the insulating layer. In the thick film integrated circuit formed by the above, a thick film integrated circuit in which at least one insulating layer is extended along the lower layer conductor at the junction between the lower layer conductor and the upper layer conductor is disclosed. According to the thick film integrated circuit described in Patent Document 1, since the insulating layer extends along the lower layer conductor at the joint portion between the lower layer conductor and the upper layer conductor, the extension portion extends the pattern printing of the cross conductor. It is said that the lateral flow of the paste of time is blocked.

Jikkenhei 1-93771 Gazette

Electronic components may be mounted on the wiring board by being connected to the wiring. As such electronic components, electronic components having a small distance between terminals, so-called narrow-pitch electronic components, are often used due to the recent miniaturization.

In order to mount a narrow-pitch electronic component, it is necessary to form a plurality of wirings at a narrow pitch. At this time, in order to suppress printing bleeding at the time of forming the wirings, the configuration described in Patent Document 1 is provided. It is conceivable to form a plurality of insulating layers in advance by utilizing the above. However, due to the occurrence of print bleeding when the insulating layer is formed, the adjacent insulating layers spread and come into contact with each other. Therefore, it becomes difficult to form wiring between adjacent insulating layers after forming the insulating layer.

Further, even if an attempt is made to form two wirings so as to partially overlap each other between adjacent insulating layers, it is difficult to conduct the two wirings if the insulating layer spreads in the portion where the two wirings are to be connected. Become. When two wirings are formed so that they partially overlap each other between adjacent insulating layers, in order to suppress printing bleeding at the part where both wirings overlap, insulation is made so that the thickness is equal to or greater than the total thickness of both wirings. It is necessary to form a layer, but it is difficult to form such a thick insulating layer without causing print bleeding.

As described above, in the configuration described in Patent Document 1, there is room for improvement when electronic components having a narrow pitch are mounted. Further, in the configuration described in Patent Document 1, a step of providing an insulating layer is required, which increases the manufacturing cost.

On the other hand, when forming two wirings so that they partially overlap each other, for example, first, a conductive paste for one wiring is printed by a screen printing method, and then a conductive paste for the other wiring is used for one wiring. Print so that some of them overlap with the conductive paste of. Normally, when printing the conductive paste for the other wiring, a screen printing plate different from that when printing the conductive paste for the other wiring is used. Therefore, due to the influence of misalignment, distortion, etc. of the screen printing plate, the other wiring is used. The conductive paste may be printed at the connection portion with the conductive paste for one-sided wiring with a deviation in the width direction with respect to the conductive paste for one-sided wiring. Further, as described above, the connection portion between the conductive paste for one wiring and the conductive paste for the other wiring is likely to cause printing bleeding due to its large thickness. Therefore, when a plurality of routes consisting of two wirings are formed at a narrow pitch in order to mount an electronic component with a narrow pitch, if the above-mentioned printing deviation and printing bleeding occur, they belong to one of the two adjacent routes. There is a risk that one wiring and the other wiring belonging to the other route will come into contact with each other and cause a short circuit.

The present invention has been made to solve the above problems, and is an elastic mounting capable of suppressing a short circuit between the first elastic wiring and the second elastic wiring even if the distance between terminals of electronic components is small. It is intended to provide a substrate.

The stretchable mounting substrate of the present invention comprises a stretchable base material, a stretchable wiring provided on one main surface side of the stretchable base material, and an electronic component electrically connected to the stretchable wiring. The elastic wiring includes a first elastic wiring and a second elastic wiring connected so as to overlap one end side of the first elastic wiring at a connection portion, and the electronic component includes the electronic component. , The terminal that protrudes in the first direction and is electrically connected to the other end side of the first elastic wiring, the terminal, the first elastic wiring, and the second elastic wiring. Consists of a wiring path toward the first direction, and a plurality of the wiring paths are provided side by side in a second direction orthogonal to the first direction, and in two wiring paths adjacent to each other in the second direction. The wiring distance, which is the shortest distance between the elastic wirings in the region between the connection portions in the second direction, is larger than the terminal distance, which is the shortest distance between the terminals in the second direction. , Characterized by that.

According to the present invention, it is possible to provide an elastic mounting board capable of suppressing a short circuit between the first elastic wiring and the second elastic wiring even if the distance between terminals of electronic components is small.

It is a plan view which partially shows the stretchable mounting substrate of Embodiment 1 of this invention. It is sectional drawing which shows the part corresponding to the line segment A1-A2 in FIG. It is a plan view which partially shows the stretchable mounting substrate of the modification of Embodiment 1 of this invention. It is sectional drawing which shows the part corresponding to the line segment B1-B2 in FIG. It is a plan view which partially shows the stretchable mounting substrate of Embodiment 2 of this invention. FIG. 3 is a schematic plan view partially showing the stretchable mounting substrate of the third embodiment of the present invention. It is a plan view which partially shows the stretchable mounting substrate of Embodiment 4 of this invention.

Hereinafter, the stretchable mounting substrate of the present invention will be described. The present invention is not limited to the following configuration, and may be appropriately modified without departing from the gist of the present invention. In addition, a combination of a plurality of individual preferred configurations described below is also the present invention.

It goes without saying that each embodiment shown below is an example, and partial replacement or combination of the configurations shown in different embodiments is possible. In the embodiments other than the first embodiment, the description of the matters common to the first embodiment will be omitted, and the differences will be mainly described. In particular, the same action and effect due to the same configuration will not be mentioned sequentially for each embodiment.

[Embodiment 1]
FIG. 1 is a schematic plan view partially showing the stretchable mounting substrate of the first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing a portion corresponding to the line segments A1-A2 in FIG.

As shown in FIGS. 1 and 2, the elastic mounting substrate 1 includes an elastic base material 10, a first elastic wiring 21a as an elastic wiring, a first elastic wiring 21b, and a first elastic wiring 21c. It has a first elastic wiring 21d, a second elastic wiring 31a, a second elastic wiring 31b, a second elastic wiring 31c, a second elastic wiring 31d, and an electronic component 40.

In the present specification, the first direction, the second direction, and the third direction are the directions defined by D1, D2, and D3, respectively, as shown in FIGS. 1, 2, and the like. The first direction D1, the second direction D2, and the third direction D3 are orthogonal to each other. In FIGS. 1 and 2, the first direction D1 and the second direction D2 are directions along one main surface 10a of the elastic base material 10, and the third direction D3 is on one main surface 10a of the elastic base material 10. The directions are orthogonal.

In the present specification, various lengths such as width, thickness, distance, etc. are shown as those in which the stretchable mounting substrate is not stretched unless otherwise specified. The width is determined by the length in the second direction D2. The thickness is determined by the length in the third direction D3. Various lengths such as width, thickness, and distance are measured by viewing the stretchable mounting substrate in a plan view or a cross-sectional view with an optical microscope.

The stretchable base material 10 preferably contains at least one resin selected from the group consisting of urethane-based resin, silicone-based resin, acrylic-based resin, and olefin-based resin. Examples of the urethane resin include thermoplastic polyurethane (TPU).

When the stretchable mounting substrate 1 is attached to a living body, the thickness of the stretchable base material 10 is preferably 100 μm or less, more preferably 50 μm or less, from the viewpoint of not inhibiting the expansion and contraction of the surface of the living body. The thickness of the elastic base material 10 is preferably 10 μm or more.

The first elastic wiring 21a is provided on one main surface 10a side of the elastic base material 10, and more specifically, is provided on one main surface 10a of the elastic base material 10.

Similarly, the first elastic wiring 21b, the first elastic wiring 21c, and the first elastic wiring 21d are each provided on one main surface 10a side of the elastic base material 10, and more specifically, It is provided on one main surface 10a of the stretchable base material 10.

As shown in FIG. 1, the width W1 of the first elastic wiring 21a is the same as the width W2 of the second elastic wiring 31a.

Similarly, as shown in FIG. 1, the widths of the first elastic wiring 21b, the first elastic wiring 21c, and the first elastic wiring 21d are the second elastic wiring 31b and the second elastic wiring, respectively. It is the same as the width of 31c and the second elastic wiring 31d.

The widths of the first elastic wiring 21a, the first elastic wiring 21b, the first elastic wiring 21c, and the first elastic wiring 21d are preferably the same as those shown in FIG. 1, but are different from each other. It may be, or it may be partially different.

As shown in FIG. 2, the thickness T1 of the first elastic wiring 21a is the same as the thickness T2 of the second elastic wiring 31a.

Similarly, although not shown, the thicknesses of the first elastic wiring 21b, the first elastic wiring 21c, and the first elastic wiring 21d are the second elastic wiring 31b and the second elastic wiring 31c, respectively. , And the thickness of the second elastic wiring 31d is the same.

The thicknesses of the first elastic wiring 21a, the first elastic wiring 21b, the first elastic wiring 21c, and the first elastic wiring 21d are preferably the same as each other, but may be different from each other. It may be different in some parts.

The second elastic wiring 31a is provided on one main surface 10a side of the elastic base material 10, and more specifically, is provided on one main surface 10a of the elastic base material 10 except for a part. ..

Similarly, the second elastic wiring 31b, the second elastic wiring 31c, and the second elastic wiring 31d are each provided on one main surface 10a side of the elastic base material 10, and more specifically, Except for a part, it is provided on one main surface 10a of the elastic base material 10.

As shown in FIGS. 1 and 2, the second elastic wiring 31a is connected so as to overlap the one end portion 21aa side of the first elastic wiring 21a at the connecting portion 51a. More specifically, in the connection portion 51a, the second elastic wiring 31a overlaps the first elastic wiring 21a on the side opposite to one main surface 10a of the elastic base material 10. The fact that the second elastic wiring 31a overlaps the first elastic wiring 21a can be seen by viewing the elastic mounting substrate 1 in a plan view with an optical microscope as shown in FIG.

Similarly, the second elastic wiring 31b is connected so as to overlap the one end portion 21ba side of the first elastic wiring 21b at the connecting portion 51b, and more specifically, at the connecting portion 51b, the second elastic wiring is connected. The 31b overlaps the first elastic wiring 21b on the side opposite to one main surface 10a of the elastic base material 10. The second elastic wiring 31c is connected so as to overlap the one end 21ca side of the first elastic wiring 21c at the connection portion 51c, and more specifically, at the connection portion 51c, the second elastic wiring 31c is connected. It overlaps the first elastic wiring 21c on the side opposite to one main surface 10a of the elastic base material 10. The second elastic wiring 31d is connected so as to overlap the one end portion 21da side of the first elastic wiring 21d at the connection portion 51d, and more specifically, at the connection portion 51d, the second elastic wiring 31d is connected to the second elastic wiring 31d. It overlaps with the first elastic wiring 21d on the side opposite to one main surface 10a of the elastic base material 10.

Unlike the configurations shown in FIGS. 1 and 2, in the connection portion 51a, the second elastic wiring 31a overlaps the first elastic wiring 21a on one main surface 10a side of the elastic base material 10. May be good. Similarly, in the connection portion 51b, the second elastic wiring 31b may overlap with the first elastic wiring 21b on one main surface 10a side of the elastic base material 10. In the connection portion 51c, the second elastic wiring 31c may overlap with the first elastic wiring 21c on one main surface 10a side of the elastic base material 10. In the connection portion 51d, the second elastic wiring 31d may overlap with the first elastic wiring 21d on one main surface 10a side of the elastic base material 10. That is, the positional relationship between the first elastic wiring and the second elastic wiring at the connection portion may be reversed with respect to the configurations shown in FIGS. 1 and 2.

The widths of the second elastic wiring 31a, the second elastic wiring 31b, the second elastic wiring 31c, and the second elastic wiring 31d are preferably the same as those shown in FIG. 1, but are different from each other. It may be, or it may be partially different.

The thicknesses of the second elastic wiring 31a, the second elastic wiring 31b, the second elastic wiring 31c, and the second elastic wiring 31d are preferably the same as each other, but may be different from each other. It may be different in some parts.

1st elastic wiring 21a, 1st elastic wiring 21b, 1st elastic wiring 21c, 1st elastic wiring 21d, 2nd elastic wiring 31a, 2nd elastic wiring 31b, 2nd elastic wiring 31c, and The second elastic wiring 31d contains, for example, a metal filler and a resin.

Examples of the metal filler contained in each elastic wiring include silver filler, copper filler, nickel filler and the like.

The metal filler contained in each elastic wiring is preferably the same type of metal, but the type of metal may be different from each other, or the type of metal may be partially different from each other.

Examples of the shape of the metal filler included in each elastic wiring include a plate shape and a spherical shape.

The metal fillers contained in each elastic wiring are preferably the same in shape, but the shapes may be different from each other, or the shapes may be partially different from each other.

The resin contained in each elastic wiring is preferably at least one elastomer resin selected from the group consisting of acrylic resin, epoxy resin, urethane resin, and silicone resin.

The resin contained in each elastic wiring is preferably the same type of resin, but the type of resin may be different from each other, or the type of resin may be partially different from each other.

The thickness T3 of the connecting portion 51a is preferably 20 μm or more. On the other hand, if the thickness T3 of the connecting portion 51a is too large, the in-plane rigidity of the connecting portion 51a becomes too high. Therefore, when the elastic mounting substrate 1 is expanded and contracted, stress tends to be concentrated on the connection portion 51a, so that the first elastic wiring 21a and the second elastic wiring 31a are less likely to shrink uniformly, and the first elastic wiring 21a And the resistance of the second elastic wiring 31a is likely to increase. From such a viewpoint, the thickness T3 of the connecting portion 51a is preferably 50 μm or less.

Similarly, the thickness of the connecting portion 51b, the connecting portion 51c, and the connecting portion 51d is preferably 20 μm or more, respectively. The thickness of the connecting portion 51b, the connecting portion 51c, and the connecting portion 51d is preferably 50 μm or less, respectively.

The thicknesses of the connecting portion 51a, the connecting portion 51b, the connecting portion 51c, and the connecting portion 51d are preferably the same, but may be different from each other or may be partially different from each other.

It is preferable that the connection portion 51a, the connection portion 51b, the connection portion 51c, and the connection portion 51d are each within a range of 5 cm from the center of the electronic component 40.

The electronic component 40 has a terminal 41a, a terminal 41b, a terminal 41c, and a terminal 41d, respectively, protruding in the first direction D1.

The terminal 41a is electrically connected to the other end 21ab side of the first elastic wiring 21a via solder or the like. More specifically, the terminal 41a is provided on the side opposite to one main surface 10a of the elastic base material 10 with respect to the first elastic wiring 21a.

Similarly, the terminal 41b is electrically connected to the other end 21bb side of the first elastic wiring 21b, and more specifically, one main of the elastic base material 10 with respect to the first elastic wiring 21b. It is provided on the opposite side of the surface 10a. The terminal 41c is electrically connected to the other end portion 21cc side of the first elastic wiring 21c, and more specifically, the terminal 41c is connected to the first elastic wiring 21c with one main surface 10a of the elastic base material 10. It is provided on the opposite side. The terminal 41d is electrically connected to the other end portion 21db side of the first elastic wiring 21d, and more specifically, the terminal 41d is connected to the first elastic wiring 21d with one main surface 10a of the elastic base material 10. It is provided on the opposite side.

Examples of the electronic component 40 include an amplifier (operational amplifier, transistor, etc.), a diode, an integrated circuit (IC), a capacitor, a resistor, an inductor, and the like.

The terminal 41a, the first elastic wiring 21a, and the second elastic wiring 31a form a wiring path 61a toward the first direction D1.

Similarly, the terminal 41b, the first elastic wiring 21b, and the second elastic wiring 31b form a wiring path 61b toward the first direction D1. The terminal 41c, the first elastic wiring 21c, and the second elastic wiring 31c form a wiring path 61c toward the first direction D1. The terminal 41d, the first elastic wiring 21d, and the second elastic wiring 31d form a wiring path 61d toward the first direction D1.

In the present specification, the terminal, the first elastic wiring, and the second elastic wiring constitute a wiring path toward the first direction, that is, when the entire wiring path is viewed, the terminal, the first elastic wiring , And means that the second stretchable wiring is substantially oriented in the first direction. In the wiring path, at least one selected from the group consisting of the terminal, the first elastic wiring, and the second elastic wiring may partially extend in a direction other than the first direction.

The wiring path 61a, the wiring path 61b, the wiring path 61c, and the wiring path 61d are provided side by side in the second direction D2. That is, the connecting portion 51a, the connecting portion 51b, the connecting portion 51c, and the connecting portion 51d are provided side by side in the second direction D2.

In the wiring path 61a and the wiring path 61b adjacent to the second direction D2, the inter-wiring distance K1 which is the shortest distance in the second direction D2 between the elastic wirings in the region between the connection portion 51a and the connection portion 51b is , The distance between terminals P1 which is the shortest distance in the second direction D2 between the terminals 41a and 41b.

Similarly, in the wiring path 61b and the wiring path 61c adjacent to the second direction D2, the shortest distance between the wirings in the second direction D2 between the elastic wirings in the region between the connection portion 51b and the connection portion 51c. The distance K2 is larger than the terminal-to-terminal distance P2, which is the shortest distance between the terminals 41b and the terminals 41c in the second direction D2. In the wiring path 61c and the wiring path 61d adjacent to the second direction D2, the inter-wiring distance K3, which is the shortest distance in the second direction D2 between the elastic wirings in the region between the connection portion 51c and the connection portion 51d, is , The distance between terminals P3, which is the shortest distance between the terminals 41c and 41d in the second direction D2.

As shown in FIG. 1, in the connection portion 51a, the first elastic wiring 21a does not extend in the second direction D2 as compared with the second elastic wiring 31a, and in the connection portion 51b, the first elastic wiring 21b is the first. In a state where the wiring does not extend in the second direction D2 from the 2 elastic wiring 31b, the inter-wiring distance K1 is the second elastic wiring 31a and the second elastic in the region between the connection portion 51a and the connection portion 51b. It is determined by the shortest distance in the second direction D2 from the wiring 31b. Then, as shown in FIG. 1, when the widths of the second elastic wiring 31a and the second elastic wiring 31b can be regarded as substantially constant along the first direction D1, the second elasticity Even if the distance in the second direction D2 between the end of the wiring 31a on the electronic component 40 side and the end of the second elastic wiring 31b on the electronic component 40 side is typically defined as the inter-wiring distance K1. good.

The inter-wiring distance K2 and the inter-wiring distance K3 are also defined in the same manner as the inter-wiring distance K1.

When manufacturing a stretchable mounting board, for example, first, a conductive paste for the first stretchable wiring is printed in a plurality of places by a screen printing method. Then, by the screen printing method, the conductive paste for the second elastic wiring is printed at a plurality of locations so as to overlap one end side of the conductive paste for the first elastic wiring printed at a plurality of locations. .. When printing the conductive paste for the second elastic wiring, a screen printing plate different from that for printing the conductive paste for the first elastic wiring is usually used, so that the screen printing plate is affected by misalignment, distortion, and the like. As a result, the conductive paste for the second elastic wiring is displaced in the second direction with respect to the conductive paste for the first elastic wiring at each connection portion with the conductive paste for the first elastic wiring. May be printed. Further, since each connection portion has a large thickness, printing bleeding is likely to occur. Therefore, in the case of forming a plurality of paths consisting of the first elastic wiring and the second elastic wiring at a narrow pitch in order to mount an electronic component having a small distance between terminals, if the above-mentioned printing misalignment and printing bleeding occur, they are adjacent to each other. In the two matching paths, the first elastic wiring belonging to one path and the second elastic wiring belonging to the other path may come into contact with each other to cause a short circuit.

On the other hand, in the stretchable mounting board 1, as described above, in the two wiring paths adjacent to the second direction D2, the distance between the wirings in the region between the connection portions is larger than the distance between the terminals. That is, in the stretchable mounting board 1, even if the distance between the terminals of the electronic component 40 is small, the distance between the wirings in the region between the connection portions is sufficiently secured. Therefore, when an electronic component having a small distance between terminals is mounted as the electronic component 40, even if the above-mentioned printing misalignment and printing bleeding occur, one wiring path is provided in the two wiring paths adjacent to the second direction D2. It is suppressed that the first elastic wiring belonging to the above and the second elastic wiring belonging to the other wiring path come into contact with each other to cause a short circuit. More specifically, in the wiring path 61a and the wiring path 61b adjacent to the second direction D2, since the wiring distance K1 is larger than the terminal distance P1, the wiring is connected to the first elastic wiring 21a belonging to the wiring path 61a. A short circuit with the second elastic wiring 31b belonging to the path 61b or a short circuit between the second elastic wiring 31a belonging to the wiring path 61a and the first elastic wiring 21b belonging to the wiring path 61b is suppressed. Similarly, in the wiring path 61b and the wiring path 61c adjacent to the second direction D2, and in the wiring path 61c and the wiring path 61d adjacent to the second direction D2, the first elastic wiring and the second elastic wiring Short circuit is suppressed.

From the above, according to the elastic mounting substrate 1, even if the distance between the terminals of the electronic component 40 is small, it is possible to suppress a short circuit between the first elastic wiring and the second elastic wiring.

The distance between wirings K1 is preferably 300 μm or more. As a result, in the wiring path 61a and the wiring path 61b adjacent to the second direction D2, even if the distance P1 between the terminals is small, the first elastic wiring 21a and the second elastic wiring 31b are short-circuited or the second expansion / contraction occurs. The short circuit between the sex wiring 31a and the first elastic wiring 21b is likely to be suppressed. On the other hand, if the distance K1 between the wirings is too large, the stretchable base material 10 having a large width is required, and it becomes difficult to reduce the size of the stretchable mounting substrate 1. From this point of view, the inter-wiring distance K1 is preferably 1000 μm or less.

Similarly, the inter-wiring distance K2 and the inter-wiring distance K3 are each preferably 300 μm or more. Further, the inter-wiring distance K2 and the inter-wiring distance K3 are each preferably 1000 μm or less.

The inter-wiring distance K1, the inter-wiring distance K2, and the inter-wiring distance K3 may be the same as each other, may be different from each other, or may be partially different from each other.

The distance between terminals P1 may be 300 μm or less. Even if the distance between terminals P1 is small as described above, in the wiring path 61a and the wiring path 61b adjacent to the second direction D2, the first elastic wiring 21a and the second elastic wiring 31b are short-circuited or the second expansion / contraction occurs. The short circuit between the sex wiring 31a and the first elastic wiring 21b is suppressed. On the other hand, for practical use of the electronic component 40, the distance between terminals P1 may be 50 μm or more.

Similarly, the distance between terminals P2 and the distance P3 between terminals may be 300 μm or less, respectively. Further, the distance between terminals P2 and the distance P3 between terminals may be 50 μm or more, respectively.

The terminal-to-terminal distance P1, the terminal-to-terminal distance P2, and the terminal-to-terminal distance P3 are often the same in practical use of the electronic component 40, but may be different from each other or may be partially different from each other. ..

In the stretchable mounting board 1, as described above, in the two wiring paths adjacent to the second direction D2, the distance between the wirings in the region between the connection portions is larger than the distance between the terminals. It is realized by a wiring path having the following form.

In the wiring path 61a, the first elastic wiring 21a extends in the first direction D1 as a whole, but partially extends in the second direction D2 by bending.

Similarly, in the wiring path 61b, the first elastic wiring 21b extends in the first direction D1 as a whole, but partially extends in the second direction D2 by bending. In the wiring path 61c, the first elastic wiring 21c extends in the first direction D1 as a whole, but partially extends in the second direction D2 by bending. In the wiring path 61d, the first elastic wiring 21d extends in the first direction D1 as a whole, but partially extends in the second direction D2 by bending.

As described above, the wiring path 61a, the wiring path 61b, the wiring path 61c, and the wiring path 61d are each classified into the first type wiring path 71 in which the first elastic wiring partially extends in the second direction D2. The wiring.

In the stretchable mounting board 1, as shown in FIG. 1, the wiring path 61a and the wiring as the first-class wiring path 71 with respect to the straight line S passing through the center of the electronic component 40 and extending in the first direction D1. The path 61b, the wiring path 61c, and the wiring path 61d are provided line-symmetrically. As a result, in the stretchable mounting substrate 1, in the two wiring paths adjacent to each other in the second direction D2, the aspect in which the distance between the wirings in the region between the connection portions is larger than the distance between the terminals is realized.

In the stretchable mounting board 1, in the range shown in FIG. 1, the second stretchable wiring 31a, the second stretchable wiring 31b, the second stretchable wiring 31c, and the second stretchable wiring 31d are in the first direction D1. Although extended, at least one second elastic wiring selected from the group consisting of the second elastic wiring 31a, the second elastic wiring 31b, the second elastic wiring 31c, and the second elastic wiring 31d is , In the region outside the range shown in FIG. 1, it may extend in the second direction D2, or may extend in a direction other than the first direction D1 and the second direction D2.

The elastic mounting board 1 is at least one second elastic selected from the group consisting of the second elastic wiring 31a, the second elastic wiring 31b, the second elastic wiring 31c, and the second elastic wiring 31d. It may further have electrodes connected to the wiring. The stretchable mounting substrate 1 can function as a sensor by being attached to a living body via such an electrode.

The electrode is preferably a gel electrode. By using the gel electrode, the stretchable mounting substrate 1 can be easily attached to the living body. The gel electrode is composed of a conductive gel material containing, for example, water, alcohol, a moisturizer, an electrolyte and the like. Examples of such gel materials include hydrogels and the like.

The stretchable mounting substrate 1 is manufactured by, for example, the following method.

<Elastic wiring forming process>
First, the first conductive paste containing the first metal filler and the first resin is printed on a plurality of places on one main surface 10a of the stretchable base material 10 by a screen printing method. At this time, by adjusting the pattern of the screen printing plate, the first conductive paste may be extended in the first direction D1 as a whole, but may be partially extended in the second direction D2 by bending. Print in place.

Next, the second conductive paste containing the second metal filler and the second resin was printed on one main surface 10a of the stretchable base material 10 by a screen printing method, and the first conductive paste was printed at a plurality of places. Print at multiple locations so that it overlaps one end of the sex paste.

Then, by heat-treating the first conductive paste and the second conductive paste, the first conductive paste to the first elastic wiring 21a, the first elastic wiring 21b, the first elastic wiring 21c, and the like. , The second elastic wiring 31a, the second elastic wiring 31b, the second elastic wiring 31c, and the second elastic wiring 31d are formed from the second conductive paste while forming the first elastic wiring 21d. ..

The second elastic wiring formed in this way is connected so as to overlap one end side of the first elastic wiring at the connection portion, and more specifically, at the connection portion, the second elastic wiring is connected. , Overlaps the first elastic wiring on the side opposite to one main surface 10a of the elastic base material 10. In the connection portion, the second elastic wiring may overlap with the first elastic wiring on one main surface 10a side of the elastic base material 10.

In the method described above, the printing of the first conductive paste and the printing of the second conductive paste are performed in order, and then the first conductive paste and the second conductive paste are heat-treated to obtain the first elasticity. The first elastic wiring group including the wiring 21a, the first elastic wiring 21b, the first elastic wiring 21c, and the first elastic wiring 21d, the second elastic wiring 31a, the second elastic wiring 31b, and the first. The 2 elastic wiring 31c and the 2nd elastic wiring group including the 2nd elastic wiring 31d are formed at the same timing.

On the other hand, unlike the method described above, by sequentially printing the first conductive paste and heat-treating the first conductive paste, the first elastic wiring 21a, the first elastic wiring 21b, and the first After forming the elastic wiring 21c and the first elastic wiring 21d, the second elastic wiring 31a and the second are obtained by sequentially printing the second conductive paste and heat-treating the second conductive paste. The elastic wiring 31b, the second elastic wiring 31c, and the second elastic wiring 31d may be formed. That is, the first elastic wiring group including the first elastic wiring 21a, the first elastic wiring 21b, the first elastic wiring 21c, and the first elastic wiring 21d, and the second elastic wiring 31a, the second. The second elastic wiring group including the elastic wiring 31b, the second elastic wiring 31c, and the second elastic wiring 31d may be formed at different timings.

Examples of the first metal filler and the second metal filler include silver filler, copper filler, nickel filler and the like.

It is preferable that the first metal filler and the second metal filler have the same metal type, but the metal types may be different from each other.

Examples of the shapes of the first metal filler and the second metal filler include a plate shape and a spherical shape.

The first metal filler and the second metal filler are preferably the same in shape, but may be different in shape from each other.

The first resin and the second resin are preferably at least one elastomer resin selected from the group consisting of acrylic resins, epoxy resins, urethane resins, and silicone resins.

It is preferable that the first resin and the second resin have the same type of resin, but the types of resin may be different from each other.

The first conductive paste and the second conductive paste may each further contain a solvent. Examples of such a solvent include diethylene glycol monoethyl ether acetate and the like.

When the first conductive paste and the second conductive paste contain a solvent, the solvent contained in the first conductive paste and the solvent contained in the second conductive paste may be of the same type as each other. Although preferred, the types of solvents may be different from each other.

<Electronic component mounting process>
On the other end side of the first elastic wiring 21a, the first elastic wiring 21b, the first elastic wiring 21c, and the first elastic wiring 21d, and the first elastic wiring 21a, the first elastic wiring. 21b, the terminal 41a, the terminal 41b, the terminal 41c, and the terminal 41c of the electronic component 40 on the side opposite to one main surface 10a of the elastic base material 10 with respect to the first elastic wiring 21c and the first elastic wiring 21d. After mounting the terminal 41d via solder paste or the like, heat treatment is performed in a reflow furnace. As a result, the terminals 41a, 41b, terminals 41c, and terminals 41d of the electronic component 40 have the first elastic wiring 21a, the first elastic wiring 21b, the first elastic wiring 21c, and the first elastic wiring, respectively. It is electrically connected to the other end side of the sex wiring 21d via solder.

In this way, the electronic component 40 is mounted. Further, the terminal, the first elastic wiring, and the second elastic wiring form a wiring path toward the first direction D1, and four wiring paths thereof are provided side by side in the second direction D2. More specifically, the wiring path 61a, the wiring path 61b, the wiring path 61c, and the wiring path 61d are provided side by side in the second direction D2.

From the above, the stretchable mounting substrate 1 is manufactured.

In the stretchable mounting board 1 manufactured in this way, the distance between the wirings in the region between the connection portions is larger than the distance between the terminals in the two wiring paths adjacent to the second direction D2.

[Modified Example 1]
In the elastic mounting board of the modification of the first embodiment of the present invention, unlike the elastic mounting board of the first embodiment of the present invention, the width of the second elastic wiring is larger than the width of the first elastic wiring, and , The thickness of the second elastic wiring is larger than the thickness of the first elastic wiring.

FIG. 3 is a schematic plan view partially showing the stretchable mounting substrate of the modified example of the first embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing a portion corresponding to the line segments B1-B2 in FIG.

As shown in FIG. 3, in the stretchable mounting substrate 1a, the width W2 of the second stretchable wiring 31a is larger than the width W1 of the first stretchable wiring 21a. As a result, the resistance of the second elastic wiring 31a tends to be lowered. Therefore, even when the distance P1 between terminals is small and it is difficult to increase the width W1 of the first elastic wiring 21a, the second elastic wiring 31a is used. It becomes easy to pass a current to the electronic component 40.

Similarly, as shown in FIG. 3, the widths of the second elastic wiring 31b, the second elastic wiring 31c, and the second elastic wiring 31d are the first elastic wiring 21b and the first elastic wiring, respectively. It is larger than the width of 21c and the first elastic wiring 21d.

As shown in FIG. 4, in the stretchable mounting substrate 1a, the thickness T2 of the second stretchable wiring 31a is larger than the thickness T1 of the first stretchable wiring 21a. As a result, the resistance of the second elastic wiring 31a is likely to be lowered, so that a current can be easily passed through the electronic component 40 by the second elastic wiring 31a.

Similarly, although not shown, the thicknesses of the second elastic wiring 31b, the second elastic wiring 31c, and the second elastic wiring 31d are the first elastic wiring 21b and the first elastic wiring 21c, respectively. And, it is larger than the thickness of the first elastic wiring 21d.

In the stretchable mounting substrate 1a, as shown in FIG. 3, the hard coat layer 90 covers at least the range from the electronic component 40 to the connection portion 51a, the connection portion 51b, the connection portion 51c, and the connection portion 51d. It may be provided. By providing the hard coat layer 90 in this way, the electronic component 40 is protected from the outside. Further, when the stretchable mounting substrate 1a expands and contracts, the durability of the connecting portion 51a, the connecting portion 51b, the connecting portion 51c, and the connecting portion 51d where stress tends to concentrate is enhanced. In particular, in the stretchable mounting substrate 1a, when the connecting portion 51a, the connecting portion 51b, the connecting portion 51c, and the connecting portion 51d are covered with the hard coat layer 90, the second elastic wiring 31a and the second elastic wiring 31a have a large width. Since at least a part of each of the second elastic wirings of the elastic wiring 31b, the second elastic wiring 31c, and the second elastic wiring 31d is covered with the hard coat layer 90, the elastic mounting substrate 1a Becomes tough against expansion and contraction.

Examples of the constituent materials of the hard coat layer 90 include polyvinyl chloride, polyethylene, polystyrene, polycarbonate, polyvinylidene fluoride, polyimide, liquid crystal polymer, polytetrafluoroethylene, phenol resin, epoxy resin, urethane resin, and acrylic resin. , Silicone-based resin, elastomer-based resin such as styrene / butadiene-based resin, and the like.

In the above, as the elastic mounting board of the modification of the first embodiment of the present invention, the width of the second elastic wiring is larger than the width of the first elastic wiring, and the thickness of the second elastic wiring is the first. An aspect in which the thickness of the elastic wiring is larger than the thickness of the elastic wiring is shown, but the width of the second elastic wiring is larger than the width of the first elastic wiring, or the thickness of the second elastic wiring is the thickness of the first elastic wiring. Similarly, even if the aspect is larger than the thickness, the resistance of the second elastic wiring tends to be low, so that the second elastic wiring makes it easy to pass a current to the electronic component.

[Embodiment 2]
In the elastic mounting board of the second embodiment of the present invention, unlike the elastic mounting board of the first embodiment of the present invention, a plurality of wiring paths are provided, and the first elastic wiring extends linearly in the first direction. The type 2 wiring route includes the seed wiring route, and the type 2 wiring route is provided on the outermost side in the second direction among the plurality of wiring routes. The elastic mounting substrate of the second embodiment of the present invention is the same as the elastic mounting substrate of the first embodiment of the present invention except for this point.

FIG. 5 is a schematic plan view partially showing the stretchable mounting substrate of the second embodiment of the present invention.

As shown in FIG. 5, the elastic mounting substrate 2 includes an elastic base material 10, a first elastic wiring 22a, a first elastic wiring 22b, a first elastic wiring 22c, and a first elastic wiring as elastic wiring. It has a sex wiring 22d, a second elastic wiring 31a, a second elastic wiring 31b, a second elastic wiring 31c, a second elastic wiring 31d, and an electronic component 40.

The first elastic wiring 22a is connected so that one end 22aa side overlaps with the second elastic wiring 31a at the connection portion 52a, and the other end 22ab side is electrically connected to the terminal 41a via solder or the like. .. In the connection portion 52a, the second elastic wiring 31a overlaps the first elastic wiring 22a on the side opposite to one main surface 10a of the elastic base material 10.

Similarly, the first elastic wiring 22b is connected so that one end 22ba side overlaps with the second elastic wiring 31b at the connection portion 52b, and the other end 22b side is electrically connected to the terminal 41b. In the connection portion 52b, the second elastic wiring 31b overlaps the first elastic wiring 22b on the side opposite to one main surface 10a of the elastic base material 10. The first elastic wiring 22c is connected so that one end 22ca side overlaps with the second elastic wiring 31c at the connection portion 52c, and the other end 22cc side is electrically connected to the terminal 41c. In the connection portion 52c, the second elastic wiring 31c overlaps the first elastic wiring 22c on the side opposite to one main surface 10a of the elastic base material 10. The first elastic wiring 22d is connected so that one end 22da side overlaps with the second elastic wiring 31d at the connection portion 52d, and the other end 22db side is electrically connected to the terminal 41d. In the connection portion 52d, the second elastic wiring 31d overlaps the first elastic wiring 22d on the side opposite to one main surface 10a of the elastic base material 10.

Unlike the configuration shown in FIG. 5, in the connection portion 52a, the second elastic wiring 31a may overlap the first elastic wiring 22a on one main surface 10a side of the elastic base material 10. Similarly, in the connection portion 52b, the second elastic wiring 31b may overlap the first elastic wiring 22b on one main surface 10a side of the elastic base material 10. In the connection portion 52c, the second elastic wiring 31c may overlap with the first elastic wiring 22c on one main surface 10a side of the elastic base material 10. In the connection portion 52d, the second elastic wiring 31d may overlap the first elastic wiring 22d on one main surface 10a side of the elastic base material 10. That is, the positional relationship between the first elastic wiring and the second elastic wiring at the connection portion may be reversed with respect to the configuration shown in FIG.

The terminal 41a, the first elastic wiring 22a, and the second elastic wiring 31a form a wiring path 62a toward the first direction D1.

Similarly, the terminal 41b, the first elastic wiring 22b, and the second elastic wiring 31b form a wiring path 62b toward the first direction D1. The terminal 41c, the first elastic wiring 22c, and the second elastic wiring 31c form a wiring path 62c toward the first direction D1. The terminal 41d, the first elastic wiring 22d, and the second elastic wiring 31d form a wiring path 62d toward the first direction D1.

The wiring path 62a, the wiring path 62b, the wiring path 62c, and the wiring path 62d are provided side by side in the second direction D2. That is, the connecting portion 52a, the connecting portion 52b, the connecting portion 52c, and the connecting portion 52d are provided side by side in the second direction D2.

In the wiring path 62a and the wiring path 62b adjacent to the second direction D2, the inter-wiring distance L1 which is the shortest distance in the second direction D2 between the elastic wirings in the region between the connecting portion 52a and the connecting portion 52b is , The distance between terminals is larger than P1.

Similarly, in the wiring path 62b and the wiring path 62c adjacent to the second direction D2, the shortest distance between the wirings in the second direction D2 between the elastic wirings in the region between the connection portion 52b and the connection portion 52c. The distance L2 is larger than the distance between terminals P2. In the wiring path 62c and the wiring path 62d adjacent to the second direction D2, the inter-wiring distance L3, which is the shortest distance in the second direction D2 between the elastic wirings in the region between the connecting portion 52c and the connecting portion 52d, is , The distance between terminals is larger than P3.

As described above, in the stretchable mounting board 2, the stretchable mounting board 1 has a distance between wirings larger than the distance between terminals in the region between the connection portions in the two wiring paths adjacent to the second direction D2. The same action and effect as above can be obtained.

In the stretchable mounting board 2, as described above, in the two wiring paths adjacent to each other in the second direction D2, the distance between the wirings in the region between the connection portions is larger than the distance between the terminals. It is realized by a wiring path having the following form.

In the wiring path 62b, the first elastic wiring 22b extends in the first direction D1 as a whole, but partially extends in the second direction D2 by bending. In the wiring path 62c, the first elastic wiring 22c extends in the first direction D1 as a whole, but partially extends in the second direction D2 by bending. In the wiring path 62d, the first elastic wiring 22d extends in the first direction D1 as a whole, but partially extends in the second direction D2 by bending. As described above, the wiring path 62b, the wiring path 62c, and the wiring path 62d are each classified into the above-mentioned type 1 wiring path 71.

In the wiring path 62a, the first elastic wiring 22a extends linearly in the first direction D1. As described above, the wiring path 62a is classified into the second type wiring path 72 in which the first elastic wiring extends linearly in the first direction D1, unlike the first type wiring path 71.

In the stretchable mounting board 2, the wiring path 62a as the type 2 wiring path 72 is on the same side (lower side in FIG. 5) in the second direction D2 as the wiring path 71 as the type 1 wiring path 71. 62b, a wiring path 62c, and a wiring path 62d are provided in this order. As a result, in the stretchable mounting substrate 2, in the two wiring paths adjacent to each other in the second direction D2, the aspect in which the distance between the wirings in the region between the connection portions is larger than the distance between the terminals is realized.

In the stretchable mounting board 2, the wiring path 62a as the second type wiring path 72 is the outermost wiring path 62a, the wiring path 62b, the wiring path 62c, and the wiring path 62d in the second direction D2 (the outermost wiring path 62a). In FIG. 5, it is provided on the uppermost side). As a result, in terms of the layout of the wiring path, a wide space can be provided between the wiring path 62a and the end portion (upper end in FIG. 5) of the elastic base material 10, so that the wide space can be used as another electronic component. Can be used by installing.

In the stretchable mounting board 2, in the wiring path 62a, the first stretchable wiring 22a extends linearly in the first direction D1, so that the path length is longer than that of the wiring path 62b, the wiring path 62c, and the wiring path 62d. Is short. Therefore, in the stretchable mounting substrate 2, the voltage drop due to the large current can be suppressed by selecting the wiring path 62a as the wiring path through which the large current flows.

[Embodiment 3]
In the stretchable mounting board of the third embodiment of the present invention, unlike the stretchable mounting board of the second embodiment of the present invention, the type 2 wiring path is located on the outermost side in the second direction among the plurality of wiring paths. Not provided. The elastic mounting substrate of the third embodiment of the present invention is the same as the elastic mounting substrate of the second embodiment of the present invention except for this point.

FIG. 6 is a schematic plan view partially showing the stretchable mounting substrate of the third embodiment of the present invention.

As shown in FIG. 6, the elastic mounting substrate 3 includes an elastic base material 10, a first elastic wiring 23a, a first elastic wiring 23b, a first elastic wiring 23c, and a first elastic wiring as elastic wiring. It has a sex wiring 23d, a second elastic wiring 31a, a second elastic wiring 31b, a second elastic wiring 31c, a second elastic wiring 31d, and an electronic component 40.

The first elastic wiring 23a is connected so that one end 23aa side overlaps with the second elastic wiring 31a at the connection portion 53a, and the other end 23ab side is electrically connected to the terminal 41a via solder or the like. .. In the connection portion 53a, the second elastic wiring 31a overlaps the first elastic wiring 23a on the side opposite to one main surface 10a of the elastic base material 10.

Similarly, the first elastic wiring 23b is connected so that one end 23ba side overlaps with the second elastic wiring 31b at the connection portion 53b, and the other end 23bb side is electrically connected to the terminal 41b. In the connection portion 53b, the second elastic wiring 31b overlaps the first elastic wiring 23b on the side opposite to one main surface 10a of the elastic base material 10. The first elastic wiring 23c is connected so that one end 23ca side overlaps with the second elastic wiring 31c at the connection portion 53c, and the other end 23cc side is electrically connected to the terminal 41c. In the connection portion 53c, the second elastic wiring 31c overlaps the first elastic wiring 23c on the side opposite to one main surface 10a of the elastic base material 10. The first elastic wiring 23d is connected so that one end 23da side overlaps with the second elastic wiring 31d at the connection portion 53d, and the other end 23db side is electrically connected to the terminal 41d. In the connection portion 53d, the second elastic wiring 31d overlaps the first elastic wiring 23d on the side opposite to one main surface 10a of the elastic base material 10.

Unlike the configuration shown in FIG. 6, in the connection portion 53a, the second elastic wiring 31a may overlap the first elastic wiring 23a on one main surface 10a side of the elastic base material 10. Similarly, in the connection portion 53b, the second elastic wiring 31b may overlap with the first elastic wiring 23b on one main surface 10a side of the elastic base material 10. In the connection portion 53c, the second elastic wiring 31c may overlap with the first elastic wiring 23c on one main surface 10a side of the elastic base material 10. In the connection portion 53d, the second elastic wiring 31d may overlap with the first elastic wiring 23d on one main surface 10a side of the elastic base material 10. That is, the positional relationship between the first elastic wiring and the second elastic wiring at the connection portion may be reversed with respect to the configuration shown in FIG.

The terminal 41a, the first elastic wiring 23a, and the second elastic wiring 31a form a wiring path 63a toward the first direction D1.

Similarly, the terminal 41b, the first elastic wiring 23b, and the second elastic wiring 31b form a wiring path 63b toward the first direction D1. The terminal 41c, the first elastic wiring 23c, and the second elastic wiring 31c form a wiring path 63c toward the first direction D1. The terminal 41d, the first elastic wiring 23d, and the second elastic wiring 31d form a wiring path 63d toward the first direction D1.

The wiring path 63a, the wiring path 63b, the wiring path 63c, and the wiring path 63d are provided side by side in the second direction D2. That is, the connection portion 53a, the connection portion 53b, the connection portion 53c, and the connection portion 53d are provided side by side in the second direction D2.

In the wiring path 63a and the wiring path 63b adjacent to the second direction D2, the inter-wiring distance M1 which is the shortest distance in the second direction D2 between the elastic wirings in the region between the connection portion 53a and the connection portion 53b is , The distance between terminals is larger than P1.

Similarly, in the wiring path 63b and the wiring path 63c adjacent to the second direction D2, the shortest distance between the wirings in the second direction D2 between the elastic wirings in the region between the connection portion 53b and the connection portion 53c. The distance M2 is larger than the distance between terminals P2. In the wiring path 63c and the wiring path 63d adjacent to the second direction D2, the inter-wiring distance M3, which is the shortest distance in the second direction D2 between the elastic wirings in the region between the connection portion 53c and the connection portion 53d, is , The distance between terminals is larger than P3.

As described above, in the stretchable mounting board 3, in the two wiring paths adjacent to the second direction D2, the distance between the wirings in the region between the connection portions is larger than the distance between the terminals, so that the stretchable mounting board 1 The same action and effect as above can be obtained.

In the stretchable mounting board 3, as described above, in the two wiring paths adjacent to the second direction D2, the distance between the wirings in the region between the connection portions is larger than the distance between the terminals. It is realized by a wiring path having the following form.

In the wiring path 63a, the first elastic wiring 23a extends in the first direction D1 as a whole, but partially extends in the second direction D2 by bending. In the wiring path 63c, the first elastic wiring 23c extends in the first direction D1 as a whole, but partially extends in the second direction D2 by bending. In the wiring path 63d, the first stretchable wiring 23d extends in the first direction D1 as a whole, but partially extends in the second direction D2 by bending. As described above, the wiring path 63a, the wiring path 63c, and the wiring path 63d are each classified into the above-mentioned type 1 wiring path 71.

In the wiring path 63b, the first elastic wiring 23b extends linearly in the first direction D1. As described above, the wiring path 63b is classified into the above-mentioned type 2 wiring path 72.

In the stretchable mounting board 3, the wiring path 63a as the first-class wiring path 71 is on one side (upper side in FIG. 6) in the second direction D2 with respect to the wiring path 63b as the second-class wiring path 72. Is provided, and a wiring path 63c and a wiring path 63d as the first-class wiring path 71 are provided on the other side (lower side in FIG. 6). As a result, in the stretchable mounting substrate 3, in the two wiring paths adjacent to each other in the second direction D2, the aspect in which the distance between the wirings in the region between the connection portions is larger than the distance between the terminals is realized.

In the stretchable mounting board 3, in the wiring path 63b, the first stretchable wiring 23b extends linearly in the first direction D1, so that the path length is longer than the wiring path 63a, the wiring path 63c, and the wiring path 63d. Is short. Therefore, in the stretchable mounting substrate 3, the voltage drop due to the large current can be suppressed by selecting the wiring path 63b as the wiring path through which the large current flows.

[Embodiment 4]
In the elastic mounting board of the fourth embodiment of the present invention, unlike the elastic mounting board of the first embodiment of the present invention, a plurality of wiring paths are provided so that the first elastic wiring is in a direction other than the first direction and the second direction. Includes a partially extended Type 3 wiring path. The elastic mounting substrate of the fourth embodiment of the present invention is the same as the elastic mounting substrate of the first embodiment of the present invention except for this point.

FIG. 7 is a schematic plan view partially showing the stretchable mounting substrate of the fourth embodiment of the present invention.

As shown in FIG. 7, the stretchable mounting substrate 4 includes a stretchable base material 10, a first stretchable wiring 24a, a first stretchable wiring 24b, a first stretchable wiring 24c, and a first stretchable wiring as stretchable wiring. It has a sex wiring 24d, a second elastic wiring 31a, a second elastic wiring 31b, a second elastic wiring 31c, a second elastic wiring 31d, and an electronic component 40.

The first elastic wiring 24a is connected so that one end 24aa side overlaps with the second elastic wiring 31a at the connection portion 54a, and the other end 24ab side is electrically connected to the terminal 41a via solder or the like. .. In the connection portion 54a, the second elastic wiring 31a overlaps the first elastic wiring 24a on the side opposite to one main surface 10a of the elastic base material 10.

Similarly, the first elastic wiring 24b is connected so that one end 24ba side overlaps with the second elastic wiring 31b at the connection portion 54b, and the other end 24bb side is electrically connected to the terminal 41b. In the connection portion 54b, the second elastic wiring 31b overlaps the first elastic wiring 24b on the side opposite to one main surface 10a of the elastic base material 10. The first elastic wiring 24c is connected so that one end 24ca side overlaps with the second elastic wiring 31c at the connection portion 54c, and the other end 24cc side is electrically connected to the terminal 41c. In the connection portion 54c, the second elastic wiring 31c overlaps the first elastic wiring 24c on the side opposite to one main surface 10a of the elastic base material 10. The first elastic wiring 24d is connected so that one end 24da side overlaps with the second elastic wiring 31d at the connection portion 54d, and the other end 24db side is electrically connected to the terminal 41d. In the connection portion 54d, the second elastic wiring 31d overlaps the first elastic wiring 24d on the side opposite to one main surface 10a of the elastic base material 10.

Unlike the configuration shown in FIG. 7, in the connection portion 54a, the second elastic wiring 31a may overlap the first elastic wiring 24a on one main surface 10a side of the elastic base material 10. Similarly, in the connection portion 54b, the second elastic wiring 31b may overlap with the first elastic wiring 24b on one main surface 10a side of the elastic base material 10. In the connection portion 54c, the second elastic wiring 31c may overlap with the first elastic wiring 24c on one main surface 10a side of the elastic base material 10. In the connection portion 54d, the second elastic wiring 31d may overlap with the first elastic wiring 24d on one main surface 10a side of the elastic base material 10. That is, the positional relationship between the first elastic wiring and the second elastic wiring at the connection portion may be reversed with respect to the configuration shown in FIG. 7.

The terminal 41a, the first elastic wiring 24a, and the second elastic wiring 31a form a wiring path 64a toward the first direction D1.

Similarly, the terminal 41b, the first elastic wiring 24b, and the second elastic wiring 31b form a wiring path 64b toward the first direction D1. The terminal 41c, the first elastic wiring 24c, and the second elastic wiring 31c form a wiring path 64c toward the first direction D1. The terminal 41d, the first elastic wiring 24d, and the second elastic wiring 31d form a wiring path 64d toward the first direction D1.

The wiring path 64a, the wiring path 64b, the wiring path 64c, and the wiring path 64d are provided side by side in the second direction D2. That is, the connecting portion 54a, the connecting portion 54b, the connecting portion 54c, and the connecting portion 54d are provided side by side in the second direction D2.

In the wiring path 64a and the wiring path 64b adjacent to the second direction D2, the inter-wiring distance N1 which is the shortest distance in the second direction D2 between the elastic wirings in the region between the connection portion 54a and the connection portion 54b is , The distance between terminals is larger than P1.

Similarly, in the wiring path 64b and the wiring path 64c adjacent to the second direction D2, the shortest distance between the wirings in the second direction D2 between the elastic wirings in the region between the connection portion 54b and the connection portion 54c. The distance N2 is larger than the distance between terminals P2. In the wiring path 64c and the wiring path 64d adjacent to the second direction D2, the inter-wiring distance N3, which is the shortest distance in the second direction D2 between the elastic wirings in the region between the connecting portion 54c and the connecting portion 54d, is , The distance between terminals is larger than P3.

As described above, in the stretchable mounting board 4, the stretchable mounting board 1 has a distance between wirings larger than the distance between terminals in the region between the connection portions in the two wiring paths adjacent to the second direction D2. The same action and effect as above can be obtained.

In the stretchable mounting board 4, as described above, in the two wiring paths adjacent to the second direction D2, the distance between the wirings in the region between the connection portions is larger than the distance between the terminals. It is realized by a wiring path having the following form.

In the wiring path 64a, the first elastic wiring 24a extends in the first direction D1 as a whole, but in directions other than the first direction D1 and the second direction D2 (in FIG. 7, the first direction D1 and the second direction). Partially extends in the diagonal direction with respect to D2).

Similarly, in the wiring path 64b, the first elastic wiring 24b extends in the first direction D1 as a whole, but partially extends in directions other than the first direction D1 and the second direction D2. In the wiring path 64c, the first elastic wiring 24c extends in the first direction D1 as a whole, but partially extends in a direction other than the first direction D1 and the second direction D2. In the wiring path 64d, the first stretchable wiring 24d extends in the first direction D1 as a whole, but partially extends in a direction other than the first direction D1 and the second direction D2.

As described above, in the wiring path 64a, the wiring path 64b, the wiring path 64c, and the wiring path 64d, the first elastic wiring is partially extended in a direction other than the first direction D1 and the second direction D2, respectively. It is classified into three types of wiring paths 73.

In the stretchable mounting board 4, as shown in FIG. 7, the wiring path 64a and the wiring as the third type wiring path 73 with respect to the straight line S passing through the center of the electronic component 40 and extending in the first direction D1. The path 64b, the wiring path 64c, and the wiring path 64d are provided line-symmetrically. As a result, in the stretchable mounting board 4, in the two wiring paths adjacent to each other in the second direction D2, the aspect in which the distance between the wirings in the region between the connection portions is larger than the distance between the terminals is realized.

In each of the stretchable mounting boards 1, the stretchable mounting board 2, and the stretchable mounting board 3 described above, the first-class wiring path 71 is adjacent to the second direction D2 in at least a part of the region. Since the first elastic wirings are provided in such a manner, the first elastic wirings can easily approach each other locally at the portion bent in the second direction D2. For example, in the elastic mounting substrate 1, as shown in FIG. 1, the first elastic wiring 21a and the first elastic wiring 21b are locally approached, and the first elastic wiring 21c and the first elastic wiring 21d Is approaching locally. If the first elastic wirings are too close to each other locally, the possibility of a short circuit between the first elastic wirings increases.

On the other hand, in the stretchable mounting board 4, as shown in FIG. 7, the type 3 wiring path 73 is provided so as to be adjacent to the second direction D2 instead of the type 1 wiring path 71. It is difficult for the first elastic wiring to come close to each other locally. Therefore, the possibility of a short circuit between the first elastic wirings is reduced.

In each embodiment, the second elastic wiring is connected so as to overlap one end side of the first elastic wiring at the connection portion, and more specifically, at the connection portion, the second elastic wiring is connected to the second elastic wiring. 1 The elastic wiring overlaps with one main surface of the elastic base material on the opposite side. On the other hand, although the second elastic wiring is connected so as to overlap one end side of the first elastic wiring at the connection portion, unlike each embodiment, as described above, at the connection portion, the second elastic wiring is connected. 2 The elastic wiring may overlap with one main surface side of the elastic base material with respect to the first elastic wiring. That is, the positional relationship between the first elastic wiring and the second elastic wiring at the connection portion may be reversed for each embodiment.

In each embodiment, the number of wiring paths is four, that is, the number of terminals, the first elastic wiring, and the second elastic wiring is four. On the other hand, unlike each embodiment, the number of wiring paths may be two, three, or five or more. That is, the number of terminals, the first elastic wiring, and the second elastic wiring may be two, three, or five or more, respectively.

1, 1a, 2, 3, 4 Stretchable mounting substrate 10 Stretchable base material 10a One main surface of the stretchable base material 21a, 21b, 21c, 21d, 22a, 22b, 22c, 22d, 23a, 23b, 23c, 23d , 24a, 24b, 24c, 24d 1st elastic wiring 21aa, 21ba, 21ca, 21da, 22aa, 22ba, 22ca, 22da, 23aa, 23ba, 23ca, 23da, 24aa, 24ba, 24ca, 24da One end 21ab, 21bb, 21cc, 21db, 22ab, 22bb, 22bb, 22db, 23ab, 23bb, 23cab, 23db, 24ab, 24bb, 24bb, 24db The other end of the first elastic wiring 31a, 31b, 31c, 31d Second elastic wiring 40 Electronic parts 41a, 41b, 41c, 41d Terminals 51a, 51b, 51c, 51d, 52a, 52b, 52c, 52d, 53a, 53b, 53c, 53d, 54a, 54b, 54c, 54d Connection part 61a , 61b, 61c, 61d, 62a, 62b, 62c, 62d, 63a, 63b, 63c, 63d, 64a, 64b, 64c, 64d Wiring route 71 Type 1 wiring route 72 Type 2 wiring route 73 Type 3 wiring route 90 Hard coat layer D1 1st direction D2 2nd direction D3 3rd direction K1, K2, K3, L1, L2, L3, M1, M2, M3, N1, N2, N3 Wiring distance P1, P2, P3 Terminal distance S Straight line T1 Thickness of 1st elastic wiring T2 Thickness of 2nd elastic wiring T3 Thickness of connection part W1 Width of 1st elastic wiring W2 Width of 2nd elastic wiring

Claims (11)

With elastic base material,
The elastic wiring provided on one main surface side of the elastic base material and
With electronic components electrically connected to the stretchable wiring,
The elastic wiring includes a first elastic wiring and a second elastic wiring connected so as to overlap one end side of the first elastic wiring at a connection portion.
The electronic component has a terminal that protrudes in the first direction and is electrically connected to the other end side of the first stretchable wiring.
The terminal, the first elastic wiring, and the second elastic wiring form a wiring path toward the first direction.
A plurality of the wiring paths are provided side by side in the second direction orthogonal to the first direction.
In the two wiring paths adjacent to each other in the second direction, the distance between the wirings, which is the shortest distance in the second direction between the elastic wirings in the region between the connection portions, is the second distance between the terminals. A stretchable mounting board characterized by being larger than the distance between terminals, which is the shortest distance in the direction. The elastic mounting according to claim 1, wherein in the connection portion, the second elastic wiring overlaps the first elastic wiring on the side opposite to the one main surface of the elastic base material. substrate. The stretchable mounting board according to claim 1 or 2, wherein the distance between the wirings is 300 μm or more. The stretchable mounting substrate according to any one of claims 1 to 3, wherein the distance between the terminals is 300 μm or less. The stretchable mounting board according to any one of claims 1 to 4, wherein the width of the second stretchable wiring is larger than the width of the first stretchable wiring. The stretchable mounting substrate according to any one of claims 1 to 5, wherein the thickness of the second stretchable wiring is larger than the thickness of the first stretchable wiring. The stretchable mounting substrate according to any one of claims 1 to 6, wherein the plurality of wiring paths include a first-class wiring path in which the first stretchable wiring partially extends in the second direction. The stretchable mounting substrate according to any one of claims 1 to 7, wherein the plurality of wiring paths include a type 2 wiring path in which the first stretchable wiring extends linearly in the first direction. The stretchable mounting substrate according to claim 8, wherein the type 2 wiring path is provided on the outermost side in the second direction among the plurality of wiring paths. The plurality of wiring paths according to any one of claims 1 to 9, further comprising a type 3 wiring path in which the first elastic wiring partially extends in a direction other than the first direction and the second direction. Elastic mounting board. The stretchable mounting substrate according to any one of claims 1 to 10, wherein a hard coat layer is provided so as to cover at least the range from the electronic component to the connection portion.

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