US Patent 10477297 Circumaural earphone

A circumaural earphone including a headband, an adjustment mechanism, a rod, and an earphone module assembled to the rod is provided. The adjustment mechanism disposed at an end of the headband includes a housing and a pivoting ring assembled in the housing to be rotatable about an axis relative to the housing. The rod is disposed rotatably through the pivoting ring and the housing along the axis, wherein the rod and the pivoting ring are adapted to each other structurally for the rod to drive the pivoting ring to rotate about the axis synchronously. The earphone module is disposed on the rod.