Cable routing structure

1. A cable routing structure comprising:

a plurality of cables that are superposed on one another and that are movable relatively to one another in length directions thereof; and

a line length difference housing case that contains parts of the plurality of cables and that is movable in a reciprocating direction,

wherein the line length difference housing case absorbs differences in line length among the plurality of cables generated in accordance with a moving position of the line length difference housing case,

wherein the line length difference housing case comprises:

an insertion port for inserting the plurality of cables into the line length difference housing case; and

a routing portion that arranges the plurality of cables so that the plurality of cables inserted through the insertion port include curved portions having substantially U shape and folded portions,

wherein the curved portions are arranged in the line length difference housing case so that an opening of the substantially U shape of the curved portions is directed to the insertion port, and

wherein the routing portion arranges the plurality of cables so that first parts of the plurality of cables inserted through the insertion port and extending in an insertion direction thereof, second parts of the plurality of cables extending in a direction opposite to the insertion direction, the curved portions having one ends and other ends, the one ends of the curved portions being connected to one ends of the first parts and the other ends of the curved portions being connected to one ends of the second parts, third parts of the plurality of cables extending in the insertion direction, and the folded portion have one ends and other ends, the one ends of the folded portions being connected to other ends of the second parts and the other ends of the folded portions being connected to one ends of the third parts.

2. The cable routing structure according to claim 1 , wherein the routing portion has a binding member that binds the plurality of cables.

3. The cable routing structure according to claim 1 , wherein a part of one of the plurality of cables which is arranged at most inner side in the curved portion of the plurality of cables is fixed to the insertion port of the line length difference housing case.

4. The cable routing structure according to claim 1 , further comprising:

a winding unit that takes up the plurality of cables,

wherein the line length difference housing case contains a part of the plurality of cables drawn out from the winding unit.

5. The cable routing structure according to claim 4 , wherein the line length difference housing case contains end parts of the plurality of cables drawn out from the winding unit, the end parts of the plurality of cables including the first parts, the second parts, and the third parts.

6. The cable routing structure according to claim 1 , wherein the routing portion includes a shape holding member having a curved face along the curved portions and located at an inner circumferential side of the curved portions.

7. The cable routing structure according to claim 1 , wherein the plurality of cables are flat cables.

8. The cable routing structure according to claim 1 , further comprising:

a protective member that covers outer circumferences of the plurality of cables collectively.

9. The cable routing structure according to claim 1 , wherein the line length difference housing case has a retaining portion configured to retain to a connection target to be movable together with the line length difference housing case.

10. The cable routing structure according to claim 1 , wherein the line length difference housing case is integrally formed with a connection target to be movable together with the line length difference housing case.

11. The cable routing structure according to claim 1 , wherein the reciprocating direction is substantially parallel with the insertion direction.