Patent ID: 8727936

Claim:
A rotary connector comprising: a stationary housing that includes an outer cylindrical body and a bottom plate portion and a movable housing that is disposed coaxially with the stationary housing and includes an inner cylindrical body facing the outer cylindrical body, an annular space portion being formed between the inner and outer cylindrical bodies facing each other and flat cables being wound and received in the annular space portion, an internal gear provided on an inner surface of the stationary housing, a sun gear, which is disposed coaxially with the internal gear and faces the internal gear, provided at the inner cylindrical body of the movable housing, a planetary gear, which meshes with the sun gear and the internal gear and rotates and revolves, rotatably provided on the bottom plate portion, and wherein at least one of the planetary gear, the internal gear, and the sun gear includes a ring-shape outside base, an inside base disposed inside the outside base, teeth disposed on at least one of the ring-shape outside base and the inside base, a plurality of connection portions that connect the inside base to the outside base, and a plurality of void portions in a circumferential direction and disposed between the plurality of connection portions, respectively.