Bone Conduction Earphone Face-Fitting Structure for Comfort and Sound
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Solution Overview
Problem
Existing earphones face challenges in improving sound quality and wearing comfort, particularly in the transmission of bone conduction sound waves.
Innovation Solution
A speaker assembly with a bone conduction speaker and an auxiliary face-fitting assembly that includes a rigid support member and a soft fitting member, designed to enhance support and positioning of the vibration plate, reducing pressure on the face and improving sound transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vibration plate directly contacts the face region, then bone conduction sound transmission is achieved, but the transducer workload increases and sound quality deteriorates
Solution Approach 1:
The patent introduces an auxiliary face-fitting assembly as an intermediary between the vibration plate and the user's face. This assembly includes a rigid support member and a soft fitting member that work together to transmit bone conduction vibrations while reducing the direct burden on the transducer. The rigid support member provides structural support and positioning, while the soft fitting member contacts the face region to transmit vibrations, effectively sharing the workload and improving sound transmission efficiency.
Solution Approach 2:
The auxiliary face-fitting assembly is segmented into two functional parts: a rigid support member for structural support and positioning, and a soft fitting member for vibration transmission and comfort. This segmentation allows each component to be optimized for its specific function, with the rigid part handling positioning and the soft part handling vibration transmission, thereby reducing the overall transducer workload.
2Ease of manufacture
If the rigid support member has uniform width, then manufacturing is simplified, but positioning accuracy of the vibration plate deteriorates
Solution Approach 1:
The rigid support member is designed with asymmetric width: wider at the first end (away from tragus) and narrower at the second end (facing tragus). This asymmetric geometry provides precise positioning for the vibration plate relative to the tragus while remaining manufacturable using standard machining processes. The width ratio is controlled to be between 0.05 and 0.5, optimizing both positioning accuracy and manufacturability.
3Reliability
If the soft fitting member has high hardness, then vibration transmission efficiency improves, but wearing comfort deteriorates
Solution Approach 1:
The soft fitting member's hardness parameter is specifically optimized to balance vibration transmission and comfort. The hardness is controlled within the range of 20-80 Shore A, which provides sufficient rigidity for effective bone conduction vibration transmission while maintaining softness for comfortable prolonged wear. This parameter optimization resolves the contradiction between transmission efficiency and comfort.
4Reliability
If the auxiliary face-fitting assembly is added, then sound quality and wearing comfort improve, but device complexity increases
Solution Approach 1:
The auxiliary face-fitting assembly merges multiple functions into a single integrated component structure. The rigid support member and soft fitting member are combined in a way that the rigid part provides positioning and support while the soft part provides vibration transmission and comfort. This merging approach improves sound quality and comfort without proportionally increasing complexity, as the two parts work together synergistically rather than as separate independent 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 auxiliary face-fitting assembly effectively enhances sound quality and wearing comfort by alleviating transducer workload, ensuring proper positioning of the vibration plate, and preventing deformation or damage to the soft fitting member, thereby improving overall sound transmission and user experience.
Implementation Method 1
a transducer (42), a vibration plate (431) connected to the transducer (42)
Implementation Method 2
the vibration plate (431) is in direct or indirect contact with a bone conduction contact point on a face region
Data Source
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AI summary
A speaker assembly and an earphone are provided. The speaker assembly includes a housing assembly and a bone conduction speaker. The bone conduction speaker includes a core shell, a transducer, a vibration transmission face-fitting assembly, and an auxiliary face-fitting assembly. The housing assembly includes a main housing, the core shell is supported on the main housing, and the transducer is disposed inside the core shell. The vibration transmission face-fitting assembly includes a vibration plate connected to the transducer. The auxiliary face-fitting assembly includes a rigid support member and a soft fitting member, the rigid support member is connected to the core shell, and when viewed in a vibration direction of the vibration plate, the rigid support member is closed and surrounds a periphery of the vibration plate along a circumference of the vibration plate, and a width of the rigid support member on a side facing the tragus is smaller than a width of the rigid support member on a side away from the tragus. The soft fitting member is disposed on the rigid support member, the soft fitting member is provided with a notch on a side facing the tragus and partially surrounds the vibration plate along the circumference of the vibration plate. Through the above way, the wearing comfort and sound quality of the earphone can be effectively improved.