Patent ID: 8457343
Filing Date: 2013-06-04
Classification: H04R

Abstract:
1. A safe in-ear earphone comprising: an earplug with cover; a sound cavity, it has an enlarged cavity with an outlet to become a small sound box, the earplug cover covers on the cavity; a main body, it has a chamber for an electronic control plate and a microphone and a sealed box consisted of an acoustic wave concentrated orifice, an connecting interface and a micro-loudspeaker; the acoustic wave concentrated orifice has an inversely loudhailer shape with a pair of bevel/arc/cur edges having 20° to 130° included angle which are symmetrical or no-symmetrical, a cross section of the acoustic wave concentrated orifice is a rectangle or polygon or ellipse, the acoustic wave concentrated orifice, connecting interface and an acoustic wave transmission channel have common axis and are connected together in series; the micro-loudspeaker is of seal connection with the inversed loudhailer of the acoustic wave concentrated orifice, a pronunciation face of the micro-loudspeaker is against the acoustic wave concentrated orifice in sidewise or aspectant; the acoustic wave transmission channel is a slim hose or hard tube, which connects the sound cavity at one end and the connecting interface at other end; a microphone, it is sealed in the chamber for electronic control plate with its sound receiving face outward to sound receiving holes which are on a wall of the chamber for the microphone, therefore, there are no echo and noise from the microphone to interfere acoustic wave of the loudspeakers; a plug, which connects the electronic control plate by a conducting plug line made of metal shielding line.