Patent ID: 8363874
Filing Date: 2013-01-29
Classification: H04R

Abstract:
1. An earphone comprising: at least one housing, at least one electroacoustic transducer having a first surface and a second surface, a first volume defined by the first surface of the electroacoustic transducer and by a first end of the at least one housing in the earphone, a second volume defined by the second surface of the electroacoustic transducer and by a second end of the at least one housing, an opening between the first and second volumes, and a closing unit for at least partially closing the opening, the closing unit having a bass tube element and a rotatable cover unit, a portion of a first end of the bass tube element being exposed to the first volume through an aperture in the cover unit, a portion of a second end of the bass tube element being exposed to the second volume through the opening, a length of the bass tube element being variable by rotation of the cover unit, wherein the bass tube element has a through hole and an aperture which are connected together, and wherein a position of the aperture of the cover unit relative to the aperture of the bass tube element is variable by rotation of the cover unit.