Bone Conduction Speaker Compound Vibration Device
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Solution Overview
Problem
Current bone conduction speakers suffer from limited tone quality due to resonance peaks in either low or high frequency areas, resulting in abrupt frequency responses and feeble sounds, which are difficult to improve with existing vibration devices.
Innovation Solution
A compound vibration device comprising a vibration conductive plate and a vibration board, where the vibration conductive plate is fixed with the vibration board, and both are part of a magnetic system, allowing for adjustable resonance peaks to achieve a flatter and wider frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single vibration device is used in bone conduction speakers, then the structure is simple, but the frequency response is abrupt with resonance peaks causing poor tone quality
Solution Approach 1:
The vibration device is segmented into two independent vibration boards (first vibration board and second vibration board) with different resonance characteristics. Each vibration board has its own resonance peak at different frequency ranges, and when combined, they create a composite frequency response that is flatter and wider, avoiding the abrupt resonance peaks of a single vibration device.
2Ease of manufacture
If the vibration device structure is simplified, then manufacturing is easier, but the tone quality becomes poor due to resonance peaks
Solution Approach 1:
Two vibration boards with different resonance characteristics are merged into a single composite vibration device. The first vibration board and second vibration board are positioned adjacent to each other and both contact the user's skin, working together to produce a combined vibration effect that delivers consistent and high-quality tone across a wider frequency range.
3Power
If resonance peaks are emphasized in low or high frequency areas, then certain frequency ranges are enhanced, but the overall frequency response becomes abrupt and tone quality deteriorates
Solution Approach 1:
Each vibration board is designed with specific local qualities - the first vibration board has resonance characteristics optimized for certain frequency ranges while the second vibration board has different resonance characteristics for complementary frequency ranges. This local optimization of each component's vibration properties results in a globally smooth and flat frequency response when both work together.
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 solution provides a bone conduction speaker with a flatter and wider frequency response, enhancing tone quality by adjusting low and high frequency areas, thus avoiding abrupt frequency responses and feeble sounds.
Implementation Method 1
a magnetic system, and the second torus contains a fixed voice coil, which is driven by the magnetic system
Implementation Method 2
with the vibration of the vibration board, the shell body, fixing the vibration board with some fixers, will also vibrate together with it
Implementation Method 3
The vibration conductive plate is set as the first torus, where at least two first rods in it converge to its center. The vibration board is set as the second torus, where at least two second rods in it converge to its center
Data Source
AI summary
The present disclosure relates to a bone conduction speaker and its compound vibration device. The compound vibration device comprises a vibration conductive plate and a vibration board, the vibration conductive plate is set to be the first torus, where at least two first rods inside it converge to its center; the vibration board is set as the second torus, where at least two second rods inside it converge to its center. The vibration conductive plate is fixed with the vibration board; the first torus is fixed on a magnetic system, and the second torus comprises a fixed voice coil, which is driven by the magnetic system. The bone conduction speaker in the present disclosure and its compound vibration device adopt the fixed vibration conductive plate and vibration board, making the technique simpler with a lower cost; because the two adjustable parts in the compound vibration device can adjust both low frequency and high frequency area, the frequency response obtained is flatter and the sound is broader.