ACOUSTIC DEVICES AND THEIR MAGNETIC CIRCUITS Russian patent published in 2023 - IPC H04R1/10 H04R9/02 

FIELD: acoustics.

SUBSTANCE: acoustic device is proposed, comprising: a body forming an accommodation cavity; a speaker placed in the accommodation cavity, the speaker including: one or more magnetic circuit assemblies, a voice coil, a vibration assembly, and a vibration transmission plate; moreover, the specified one or more nodes of the magnetic circuit form a magnetic gap; one end of the voice coil is located in the magnetic gap, and the other end of the voice coil is connected to the vibration assembly, the vibration assembly being connected to the vibration transmission plate, while the vibration transmission plate is connected to the shell. The vibration assembly includes an inner support, an outer support and a vibration diaphragm; other end of the voice coil is connected to the internal support. One end of the outer support is physically connected to both sides of one or more magnetic circuit assemblies, the outer support and the inner support are movably connected to the vibration diaphragm to limit the relative movement of the outer support and the inner support in the first direction and allow movement of the inner support and the vibration diaphragm relative to the outer supports in the second direction; wherein the first direction is the radial direction of the accommodation cavity and the second direction is the continuation direction of the inner support and the outer support. At least one of the inner support, the outer support, or the vibration diaphragm is connected to the vibration transmission plate to transmit vibration to the vibration transmission plate.

EFFECT: improved sound quality of the bone conduction device.

7 cl, 64 dwg