Bone-Air Conduction Headphone Layout for Stronger Vibration
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Solution Overview
Problem
The integration of air-conduction and bone-conduction loudspeakers in headphones results in weakened vibration of the bone-conduction loudspeaker due to torque imbalance, leading to decreased volume and sound quality.
Innovation Solution
The loudspeaker assembly is designed with air-conduction and bone-conduction core modules arranged along a common vibration direction, with overlapping projections and a resilient cushioning member to minimize interference, and separated accommodation spaces to enhance sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the air-conduction loudspeaker is set next to the axis of the bone-conduction loudspeaker, then both air-conduction and bone-conduction functions are integrated, but the mass of the air-conduction loudspeaker biases the vibration of the bone-conduction loudspeaker, generating two different torques in different directions, which weakens the vibration of the bone-conduction loudspeaker along the axis and decreases the volume
Solution Approach 1:
The patent positions the air-conduction loudspeaker off-axis relative to the bone-conduction loudspeaker, creating an asymmetric arrangement. This asymmetric positioning allows the air-conduction loudspeaker to be placed in a location that minimizes its mass effect on the bone-conduction loudspeaker's vibration axis, thereby reducing the biasing effect and torque interference while still achieving integrated functionality.
Solution Approach 2:
The patent applies local quality by specifically positioning the air-conduction loudspeaker in a particular spatial relationship (off-axis) to the bone-conduction loudspeaker. This localized positioning strategy addresses the vibration interference problem at the specific location where the two loudspeakers interact, allowing the bone-conduction loudspeaker to maintain strong axial vibration while the air-conduction loudspeaker provides additional audio function.
2Force
If the air-conduction loudspeaker is positioned to minimize vibration interference, then the bone-conduction volume increases, but the spatial arrangement becomes more complex
Solution Approach 1:
The patent merges the air-conduction and bone-conduction loudspeaker modules into a single integrated housing assembly. By combining both loudspeaker types in one compact unit with a coordinated spatial arrangement, the design achieves functional integration without proportionally increasing overall device complexity. The off-axis positioning is incorporated as part of the unified module design rather than as a separate complex mechanism.
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
This configuration reduces the biasing effect of the air-conduction module on the bone-conduction module, increasing volume and improving sound quality by enhancing the bone-conduction effect.
Implementation Method 1
a resilient cushioning member may be provided between the air-conduction core module and the bone-conduction core module
Implementation Method 2
As the bone-conduction technology requires the headphone to vibrate and transmit vibration signals to the human body
Data Source
AI summary
A loudspeaker assembly and a headphone are provided. The headphone includes a housing assembly, a bone-conduction core module, and an air-conduction core module, and an accommodation space. The bone-conduction core module is provided in the accommodation space and vibrates in a first vibration direction, the air-conduction core module is provided in the accommodation space, and the bone-conduction core module and the air-conduction core module are arranged along the first vibration direction and face each other. In the above manner, the present disclosure reduces the influence of the air-conduction core module on the vibration effect of the bone-conduction core module, increases the sound volume, and improves the bone-conduction effect of the loudspeaker assembly, thereby improving the sound quality effect of the loudspeaker assembly.