Flexible wiring board, electronic device, and fiber product

1. A flexible wiring board including a woven fabric or a knit fabric,

wherein the woven fabric or the knit fabric includes, as yarns constituting the woven fabric or the knit fabric, a conductive yarn and insulative yarns,

the conductive yarn includes a conductive wire including a tungsten wire having a diameter of at most 20 μm,

the conductive yarn comprises the conductive wire and a false twist yarn including an insulating fiber wound around the conductive wire,

the conductive wire is a pre-insulation wire including the tungsten wire as a core wire and an insulator coating the core wire, and

the insulative yarns account for at least 70% of the yarns including the conductive yarn and the insulative yarns.

2. The flexible wiring board according to claim 1 ,

wherein a color of a first part of the insulative yarns around the conductive yarn is different from a color of a second part of the insulative yarns different from the first part of the insulative yarns.

3. The flexible wiring board according to claim 1 ,

wherein the flexible wiring board includes the woven fabric, and

the conductive yarn comprises two conductive yarns that are parallel to each other and woven as lengthwise yarns or crosswise yarns constituting the woven fabric.

4. The flexible wiring board according to claim 1 ,

wherein the flexible wiring board includes the woven fabric, and

the conductive yarn comprises conductive yarns that are woven as lengthwise yarns and crosswise yarns crossing each other, the lengthwise yarns and the crosswise yarns constituting the woven fabric.

5. The flexible wiring board according to claim 3 ,

wherein a portion of each of the two conductive yarns is cut away, and

the two conductive yarns that are cut are electrically connected via an electronic component disposed in a place in which the portions of the two conductive yarns are cut away.

6. The flexible wiring board according to claim 4 ,

wherein a portion of each of at least two conductive yarns among the conductive yarns is cut away, and

the at least two conductive yarns that are cut are electrically connected via an electronic component disposed in a place in which the portions of the two conductive yarns are cut away.

7. An electronic device, comprising:

the flexible wiring board according to claim 3 ; and

a power source and an electrical load that are electrically connected via the flexible wiring board, the electrical load operating with power from the power source,

wherein the power source and the electrical load are electrically connected by the two conductive yarns.

8. The electronic device according to claim 7 ,

wherein the electrical load comprises a plurality of electrical loads, and

the plurality of electrical loads are connected in parallel by the two conductive yarns.

9. The electronic device according to claim 7 ,

wherein the electrical load is a light-emitting element.

10. The electronic device according to claim 7 ,

wherein the electrical load is a sensor.

11. An electronic device, comprising:

the flexible wiring board according to claim 1 ; and

an electronic element electrically connected to the flexible wiring board.

12. A fiber product including the flexible wiring board according to claim 4 as a cloth, the fiber product comprising

a plurality of light-emitting elements disposed in respective cross points of the conductive yarns crossing each other as the lengthwise yarns and the crosswise yarns,

wherein the plurality of light-emitting elements in the respective cross points are electrically connected to, among the conductive yarns, conductive yarns woven as the lengthwise yarns and conductive yarns woven as the crosswise yarns.

13. The flexible wiring board according to claim 1 , wherein the insulative yarns account for at least 90% of the yarns including the conductive yarn and the insulative yarns.

14. The flexible wiring board according to claim 1 , wherein the insulative yarns include natural fibers or chemical fibers.

15. The flexible wiring board according to claim 1 , wherein the woven fabric or the knit fabric includes only two tiers.

16. The flexible wiring board according to claim 1 , wherein a colored portion disposed as a mark on a part of the woven fabric or the knit fabric including the insulative yarns around the conductive yarn.

17. The flexible wiring board according to claim 16 , wherein the colored portion includes a color material including a binder resin and at least one selected from the group consisting of a pigment and a dye.

18. The flexible wiring board according to claim 16 , wherein the colored portion is disposed adjacent to one end of the conductive yarn.