The application discloses a
bone conduction acoustic device and a wearable device, wherein the
bone conduction acoustic device comprises an external packaging structure, a hollow cavity is arranged in the external packaging structure, and in the hollow cavity, the following components are arranged: a hollow flexure spring; an
actuator, which includes an upper magnetic part and a lower magnetic part, wherein the upper magnetic part and the lower magnetic part are arranged opposite to each other in parallel in the Z-axis direction, and there is a gap to form an isolation area; a spatial low-frequency adjustment plate, which is arranged between the hollow flexure spring and the
actuator, wherein the spatial low-frequency adjustment plate adjusts the stackup of the hollow flexure spring and the
actuator in the Z-axis direction, and adjusts the gap in the isolation area, wherein the hollow flexure spring cooperates with the spatial low-frequency adjustment plate to adjust the effective vibration area of the hollow flexure spring to adjust the
resonance frequency point of the device. The wearable device installed with the above-mentioned
bone conduction acoustic device may transmit low-frequency signals with moderate amplitude, balance the entire sound frequency range, achieve better acoustic effects, and significantly improve user experience and product
sound quality.