Stretchable wiring board and electrical muscle stimulating device

1. A stretchable wiring board comprising:

a base material having stretchability;

a wiring line having at least a portion coated and formed on the base material with a conductive stretchable material; and

an uneven engaging portion that is electrically connected to the wiring line and has a protrusion or a recess configured to engage with a connection terminal of an external device, wherein

the base material has a first side and a second side opposite to the first side,

the wiring line is disposed on the first side of the base material, and

the second side of the base material faces the connection terminal of the external device.

2. The stretchable wiring board according to claim 1 , further comprising a non-stretchable base material disposed on the first side of the base material and supporting the base material.

3. The stretchable wiring board according to claim 2 , wherein the non-stretchable base material comprises a plurality of non-stretchable base material pieces.

4. The stretchable wiring board according to claim 2 , wherein the uneven engaging portion comprises a projecting portion projecting from a hole formed in the non-stretchable base material, and a cap portion crimped to the projecting portion.

5. The stretchable wiring board according to claim 3 , wherein the uneven engaging portion corresponds to each of the non-stretchable base material pieces, and is configured to connect the non-stretchable base material piece to the external device at an arbitrary angle.

6. The stretchable wiring board according to claim 4 , wherein the base material is present around the hole of the non-stretchable base material.

7. The stretchable wiring board according to claim 3 , wherein the base material connects the non-stretchable base material pieces.

8. The stretchable wiring board according to claim 1 , wherein

the uneven engaging portion comprises a projecting portion, and a cap portion crimped to the projecting portion,

the projecting portion comprises a fixing plate, a main projecting portion projecting from the fixing plate, and a plurality of claw projecting portions having a length in a projecting direction shorter than that of the main projecting portion and formed around the main projecting portion, and

the cap portion comprises a main cap portion into which the main projecting portion is inserted, and a groove engaged with the claw projecting portion around the main cap portion.

9. The stretchable wiring board according to claim 8 , wherein the fixing plate comprises an insulating sheet that prevents electric conduction.

10. The stretchable wiring board according to claim 8 , wherein the uneven engaging portion comprises the claw projecting portion disposed at a position that does not interfere with at least a part of a virtual extension region on an extension of the wiring line.

11. An electrical muscle stimulating device comprising:

a stretchable wiring board comprising a base material having stretchability, a wiring line coated and formed on the base material with a conductive stretchable material, and an uneven engaging portion electrically connected to the wiring line and having a protrusion or a recess; and

an external device comprising a connection terminal engaged with the protrusion or the recess of the uneven engaging portion, wherein

the base material has a first side and a second side opposite to the first side,

the wiring line is disposed on the first side of the base material, and

the second side of the base material faces the connection terminal of the external device.

12. The stretchable wiring board according to claim 1 , wherein the uneven engaging portion protrudes from the second side of the base material.