Patent ID: 8891799
Filing Date: 2014-11-18
Classification: H04R

Abstract:
1. An earphone, comprising: an insertion part at least part of which is inserted in an external auditory canal; and an audio output unit which outputs sound corresponding to electric signals supplied, the audio output unit being held within the external auditory canal when the at least part of the insertion part is inserted in the external auditory canal to an insertion position, the audio output unit including an audio output face from which the sound is output to the external auditory canal when the at least part of the insertion part is inserted in the external auditory canal, wherein the insertion position is a position of the insertion part when the end of the insertion part is inserted to a depth less than a length of the external auditory canal, wherein the insertion part has a space in contact with a rear face of the audio output unit, the space being isolated from a space in front of the audio output face, and the audio output face constituting a part of an external surface of the audio output unit, wherein the audio output unit comprises a diaphragm and a voice coil, wherein the audio output unit outputs sound into the external auditory canal as electrical signals supplied to the voice coil drive the diaphragm to vibrate, and wherein the audio output unit is mounted to the insertion part in such a manner that a distance from the external auditory canal opening to the diaphragm is 3 mm or more.