Bone Conduction Speaker Compound Vibration Device
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Solution Overview
Problem
Current bone conduction speakers suffer from limited tone quality due to overtopped resonance peaks in low or high frequency areas, resulting in abrupt frequency responses and feeble sound, which is difficult to improve with existing vibration devices.
Innovation Solution
A compound vibration device comprising a vibration board and a vibration conductive plate, where the plates are torus-shaped with converging rods, fixed together through 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 speaker, then the device complexity is low, but the frequency response becomes abrupt with overtopped resonance peaks limiting tone quality
Solution Approach 1:
The vibration device is divided 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 fills in the gaps and reduces abrupt peaks, achieving a flatter overall frequency response curve.
Solution Approach 2:
The patent uses composite vibration structure combining two different vibration boards with distinct material or structural properties. The first vibration board and second vibration board are coupled together to form a composite vibration system that leverages the complementary frequency response characteristics of each component to achieve superior tone quality.
2Device complexity
If vibration board and shell body are fixed together, then the structure is simple, but the resonance peak becomes overtopped and tone quality deteriorates
Solution Approach 1:
The patent separates the vibration function from the shell body by introducing dedicated vibration boards that are not fixed to the shell. This segmentation allows the vibration boards to vibrate independently with controlled resonance characteristics, preventing the shell body from contributing unwanted resonance that would degrade tone quality.
Solution Approach 2:
The vibration function is extracted from the shell body structure and assigned to separate vibration boards. This extraction eliminates the harmful coupling between shell resonance and vibration, allowing precise control over the frequency response through the vibration boards alone, thereby maintaining consistent tone quality.
3Ease of manufacture
If current vibration device is used, then the manufacturing cost is low, but the frequency response curve shows abrupt peaks and feeble sound
Solution Approach 1:
The vibration system is segmented into two independently manufacturable vibration boards with simple geometric structures. Each board can be manufactured separately using conventional processes, and their combination provides sophisticated frequency response control without requiring complex manufacturing techniques, thus maintaining ease of manufacture while improving frequency response precision.
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 ranges, thereby avoiding abrupt frequency responses and feeble sounds.
Implementation Method 1
The vibration board is set as the second torus, where at least two second rods in 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 contains a fixed voice coil, which is driven by the magnetic system.
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.