Bone conduction speaker unit and headrest incorporating same
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Solution Overview
Problem
Existing bone conduction speakers incorporated in headrests suffer from unwanted events such as sound ringing and sound leakage due to vibration transmission to the housing, which are not adequately addressed in prior art.
Innovation Solution
A bone conduction speaker unit with a low-resilience annular body and a contact that contacts and leaves the vibration surface of the speaker body, combined with a damping material and a ventilation cover to reduce vibration propagation and sound leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bone conduction speaker is incorporated in a headrest, then sound can be transmitted to the seated person, but vibration is transmitted to the housing causing sound ringing and sound leakage
Solution Approach 1:
The patent introduces a vibration isolation structure as an intermediary between the bone conduction speaker and the headrest housing. This mediator absorbs and dampens the vibration energy, preventing it from being transmitted to the housing structure. The vibration isolation structure acts as a buffer that allows the speaker to function while blocking the harmful vibration transmission path.
Solution Approach 2:
The patent converts the harmful vibration energy into beneficial thermal energy through damping materials. The vibration that would normally cause sound ringing and leakage is instead absorbed and dissipated as heat by the damping materials, transforming a harmful effect into a harmless or even useful thermal effect.
2Reliability
If the bone conduction speaker body is in constant contact with the headrest, then vibration is transmitted to the human body, but vibration is also transmitted to the housing causing unwanted events
Solution Approach 1:
The patent segments the contact interface between the speaker and headrest by introducing a specialized contact structure with vibration isolation properties. This segmentation allows the system to maintain necessary mechanical contact for vibration transmission while isolating the housing from harmful reaction forces. The contact structure is divided into functional zones: one for effective coupling to the user's head and another for minimizing housing interaction.
Solution Approach 2:
The patent applies different material properties to different parts of the speaker assembly. The contact surface that interfaces with the user's head uses materials optimized for vibration transmission, while the mounting structure and housing interface use materials with vibration-damping properties. This local differentiation of material quality allows selective vibration transmission where needed and vibration isolation where harmful.
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 configuration suppresses sound ringing and sound leakage by minimizing vibration transmission to the housing and skin, while allowing heat dissipation through a breathable ventilation cover.
Implementation Method 1
a damping material fitted into the base frame
Implementation Method 2
a low-resilience annular body fixed to a top surface of the base frame
Data Source
AI summary
A bone conduction speaker unit is provided that when incorporated in a headrest, can suppress an unwanted event such as sound ringing or sound leakage, which occurs in a bone conduction speaker, and can be incorporated in a headrest. A bone conduction speaker unit includes a base frame 2, a low-resilience annular body 3 fixed to the top surface of the base frame 2, a damping material 4 fitted into and supported by the base frame 2, a bone conduction speaker body 5 on the damping material 4 can be surrounded by the low-resilience annular body 3, and a contact 6 disposed on the low-resilience annular body 3 to cover the bone conduction speaker body 5. The contact 6 contact the vibration surface of the bone conduction speaker body 5 when the contact 5 receives a load and to leave the bone conduction speaker body 5 when eliminated.