Dual-Conduction Speaker Module for Acoustic Interference Separation
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Solution Overview
Problem
Current electronic devices that aim to provide a metaverse experience through augmented reality and virtual reality struggle to effectively combine air conduction and bone conduction sound technologies, resulting in suboptimal sound reproduction and interference, particularly in wearable devices like AR glasses.
Innovation Solution
A modular speaker module is designed with an air conduction speaker and a bone conduction speaker sharing a yoke plate, where the air conduction speaker emits sound externally and the bone conduction speaker transfers vibrations to the user's skull, using a housing with a ring-shaped cross-section and an elastically deformable connection member, allowing for efficient sound filtering and reduced acoustic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air conduction speaker and bone conduction speaker are integrated in the same device, then sound reproduction quality is improved, but acoustic interference between the two speakers increases
Solution Approach 1:
The audio frequency spectrum is segmented into two distinct ranges: a first sound range for the air conduction speaker and a second sound range for the bone conduction speaker. This frequency segmentation prevents acoustic interference while maintaining high sound reproduction quality for both speaker types.
Solution Approach 2:
A housing structure with ring-shaped cross-section is introduced as an intermediary component between the air conduction speaker and bone conduction speaker. This housing physically separates the two speakers and their magnetic fields, reducing electromagnetic interference while allowing compact integration.
2Object-generated harmful factors
If the speaker module is designed with separate housing for bone conduction speaker, then acoustic interference is reduced, but device complexity increases
Solution Approach 1:
The housing structure serves multiple functions simultaneously: it provides structural support for the bone conduction speaker, acts as a magnetic shield to reduce interference, defines the acoustic chamber, and provides mounting surfaces for other components. This multi-functionality reduces overall device complexity despite the added separation structure.
Solution Approach 2:
The bone conduction speaker is nested within the housing structure, which itself is integrated into the overall speaker module assembly. This nested configuration allows compact arrangement of components while maintaining the necessary separation between air conduction and bone conduction pathways.
3Productivity
If the diaphragm extends to overlap the housing, then sound emission efficiency is improved, but structural stability decreases
Solution Approach 1:
The diaphragm is designed as a flexible thin film that can extend and overlap the housing structure. This flexibility allows the diaphragm to maintain its vibrational freedom for efficient sound emission while the housing provides the necessary structural support and stability, preventing excessive deformation.
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 enhances sound reproduction by separating sound ranges, minimizing interference, and providing a more immersive experience by allowing the device to generate distinct sound ranges for air conduction and bone conduction, improving user perception of sound sources' positions.
Implementation Method 1
a first speaker including a first magnet coupled to the yoke plate, a diaphragm spaced apart from the yoke plate and a first coil coupled to the diaphragm
Implementation Method 2
a second speaker including a housing coupled to the yoke plate and on a side of the first speaker, a second coil provided in the housing and coupled to the yoke plate, and a second magnet spaced apart from the second coil in the housing and coupled to the housing
Implementation Method 3
The second magnet may be coupled to the housing by an elastically deformable connection member
Data Source
AI summary
A speaker module includes a yoke plate, a first speaker including a first magnet coupled to the yoke plate, a diaphragm spaced apart from the yoke plate and a first coil coupled to the diaphragm, and a second speaker including a housing coupled to the yoke plate and on a side of the first speaker, a second coil provided in the housing and coupled to the yoke plate, and a second magnet spaced apart from the second coil in the housing and coupled to the housing.