EARPHONE DEVICE FOR SOUND REPRODUCTION (VERSIONS) AND EARPHONE Russian patent published in 2015 - IPC H04R1/10 

FIELD: physics.

SUBSTANCE: according to the first version the earphone contains the housing with an internal acoustic camera and an electro-acoustic converter installed in the housing. The housing wall thickness around the acoustic camera amounts from 5 mm up to 25 mm. The acoustic camera has a bowl-shaped form, and the internal surface of the acoustic camera opposite to the electro-acoustic converter is designed as a massif of pyramidal elements or conical elements the tops of which are facing towards the named electro-acoustic converter. According to the second version the earphone contains a number of parallel step recesses on the internal lateral surface of the sound camera. Meanwhile the internal surface of the acoustic camera can be designed as a hemisphere or a semi-oval. The material of earphones is wood. Step recesses can be located along a spiral. Height of step dredging is from 1.5 to 4 mm.

EFFECT: increase of duration of reverberation inside the sound camera of the earphone, dispersion and increase of number of phases of the rear wave.

20 cl, 14 dwg