Bone-Conduction Acoustic Structure With Dual Cavities and Adjacent Holes
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Solution Overview
Problem
Acoustic devices face issues such as poor sound quality, sound leakage, and entry of foreign objects due to complex structures.
Innovation Solution
The acoustic device incorporates a housing with a transducer and diaphragm that divides the cavity into two parts, featuring pressure relief and sound modulation holes, and a sound outlet, enhancing both bone-conduction and air-conduction sounds while reducing sound leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cavity is divided into two parts with multiple holes, then sound quality is improved, but device complexity increases
Solution Approach 1:
The cavity is divided into a first cavity and a second cavity using a diaphragm, with pressure relief holes in the first cavity and sound modulation holes in the second cavity. This segmentation allows independent optimization of different acoustic functions in separate regions, improving sound quality while managing complexity through functional separation.
Solution Approach 2:
The housing structure serves multiple functions simultaneously: it provides structural support, creates acoustic cavities, forms sound outlets, and integrates both pressure relief and sound modulation holes. This multi-functionality reduces the need for additional separate components, improving sound quality without proportionally increasing device complexity.
2Object-generated harmful factors
If pressure relief holes and sound modulation holes are arranged adjacently, then sound leakage is reduced, but manufacturing precision requirements increase
Solution Approach 1:
Different regions of the housing have different hole configurations: pressure relief holes are positioned in the first cavity region while sound modulation holes are positioned in the second cavity region. This local differentiation allows each hole type to be optimized for its specific function while their adjacent arrangement prevents sound leakage through strategic positioning.
Solution Approach 2:
The adjacent arrangement of pressure relief holes and sound modulation holes converts what could be potential sound leakage paths into beneficial acoustic features. The pressure relief holes manage pressure differential while the sound modulation holes shape the sound output, and their proximity allows them to work together to reduce overall sound leakage.
3Manufacturing precision
If the diaphragm divides the cavity, then air-conduction sound is enhanced, but device complexity increases
Solution Approach 1:
The diaphragm segments the single cavity into a first cavity for pressure relief functions and a second cavity for sound modulation functions. This segmentation enables the air-conduction sound to be enhanced through the dedicated second cavity while the first cavity handles pressure management, improving sound quality through functional separation.
Solution Approach 2:
The diaphragm merges the bone-conduction transducer with the air-conduction acoustic path by allowing the transducer to simultaneously drive both the bone conduction through the housing and the air conduction through the diaphragm into the second cavity. This merging enhances air-conduction sound quality without requiring completely separate systems.
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 improves sound quality by balancing bone-conduction and air-conduction sounds and minimizes sound leakage through structural design, resulting in enhanced acoustic performance.
Implementation Method 1
The housing produces a bone-conduction sound under an action of the transducer
Implementation Method 2
The diaphragm may be connected between the transducer and the housing to divide the cavity into a first cavity and a second cavity
Implementation Method 3
The housing may be provided with at least one pressure relief hole communicating with the first cavity
Implementation Method 4
at least one sound modulation hole communicating with the second cavity
Implementation Method 5
During a relative movement of the transducer and the housing, the diaphragm may produce an air-conduction sound transmitted outward through the sound outlet hole
Data Source
AI summary
The present disclosure provides an acoustic device. The acoustic device may include a housing, a transducer, and a diaphragm. The housing may be configured to form a cavity. The transducer may be arranged in the cavity and connected to the housing. The housing may produce a bone-conduction sound under an action of the transducer. The diaphragm may be connected between the transducer and the housing to divide the cavity into a first cavity and a second cavity. The housing may be provided with at least one pressure relief hole communicating with the first cavity and at least one sound modulation hole communicating with the second cavity. At least a portion of the at least one pressure relief hole and at least a portion of the at least one sound modulation hole may be arranged adjacently. The housing may be further provided with a sound outlet hole communicating with the second cavity. The diaphragm may produce an air-conduction sound transmitted outward through the sound outlet hole during a relative movement of the transducer and the housing.