Patent ID: 7697710
Filing Date: 2010-04-13
Classification: H04R

Abstract:
1. An earphone with a sound guiding tube, comprising: an external chamber; an in-ear type sound guiding tube, connected to the external chamber, to be placed in a user's ear; a first speaker, disposed at a first side of the external chamber, a second side of the external chamber being blocked to form a space in the external chamber, the sound produced by the first speaker forming a sound field in an inner space of the external chamber and then being transmitted into the user's ear through the in-ear type sound guiding tube; a second speaker and a third speaker, both of which are disposed on a surrounding side of the external chamber except for the first side and the second side; an extension chamber, disposed at outside of the external chamber and having a communicating channel with the inner space of the external chamber; and a fourth speaker, disposed inside the external chamber.