ACOUSTIC OUTPUT DEVICE Russian patent published in 2023 - IPC H04R9/06 

FIELD: acoustics.

SUBSTANCE: acoustic output device comprises sound vibration excitation means configured to generate sounds having opposite phases, and sounds with opposite phases are radiated outwardly from at least two sound guide holes, respectively. The housing is made with the possibility of placing vibration excitation means in it, and containing a contact surface with the user, moreover, when the user wears an acoustic output device on himself, the contact surface with the user is made with the possibility of contact with the user's body, and the included angle between the connection line of the indicated at least two sonic guide holes and the user contact surface is between 75° and 90°. Both holes are placed so that the distance from the first sound guide hole to the user contact surface is less than the distance from the second sound guide hole to the user contact surface.

EFFECT: reduced sound leakage into outer space.

9 cl, 17 dwg