Bone Conduction Actuator With Flexure Spring for Bass Vibration Control
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Solution Overview
Problem
Existing bone conduction headphones experience strong vibration amplitude during low-frequency signal transmission, leading to poor user experience and inadequate bass reproduction.
Innovation Solution
A bone conduction acoustic device with a hollow flexure spring, actuator, and spatial low-frequency adjustment plate, utilizing magnetic balance and a cover plate to adjust resonance frequency and amplitude, ensuring moderate signal transmission and balanced sound frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the bone conduction acoustic device transmits low-frequency signals, then the bass content is enriched, but the vibration amplitude becomes relatively large causing strong vibration sensation
Solution Approach 1:
The hollow flexure spring acts as an intermediary element between the actuator and the bone conduction transmission path. It decouples the direct rigid connection, allowing the system to transmit low-frequency bass signals while reducing the direct transmission of high-amplitude vibrations to the user's skull, thus enriching bass content while mitigating excessive vibration sensation.
Solution Approach 2:
The patent adjusts the resonance frequency point of the device by modifying the gap in the isolation area and the stackup of components. By changing these physical parameters, the system optimizes the transmission characteristics to achieve moderate vibration amplitude while maintaining rich bass content across the low-frequency range.
2Quantity of substance
If the resonance frequency point is adjusted to transmit low-frequency signals, then the bass reproduction is improved, but the vibration amplitude increases affecting user experience
Solution Approach 1:
The hollow flexure spring serves as a mediator that allows the system to achieve improved low-frequency reproduction through resonance frequency adjustment while simultaneously reducing the transmission of excessive vibrations to the user, thereby maintaining comfort and user experience.
Solution Approach 2:
By adjusting the resonance frequency point through parameter changes in the isolation area gap and component stacking, the system achieves optimal balance between low-frequency content transmission and vibration amplitude control, improving user experience while maintaining audio quality.
3Manufacturing precision
If the actuator uses magnetic parts arranged in parallel opposite to each other, then the magnetic static balance is achieved for best fidelity, but the device complexity increases
Solution Approach 1:
The actuator employs two magnetic parts arranged in parallel opposite to each other, creating a magnetic static balance where the repulsion force between the magnetic parts equals the attractive force between the magnetic part and the magnetic bowl. This counterbalancing arrangement achieves best fidelity effect while maintaining a relatively compact and manageable structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves moderate amplitude and synchronized bass transmission, improving user experience and sound quality by balancing the entire sound frequency range.
Implementation Method 1
adjusts the resonance frequency point of the device
Implementation Method 2
the repulsion force between the upper magnetic part and the lower magnetic part is equal to the attractive force between the upper magnetic part and the lower magnetic bowl to maintain magnetic static balance
Implementation Method 3
the actuator further comprises a coil installed in the lower magnetic bowl and arranged around the lower magnetic part
Data Source
AI summary
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.