Headrest Speaker Layout With 3D Fabric Anti-Flapping Structure
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Solution Overview
Problem
Existing headrests with integrated speakers struggle to enhance stereo feeling in limited spaces due to interference between sound outputs and degradation of acoustic characteristics caused by flapping of three-dimensional fabric at resonance frequencies.
Innovation Solution
The headrest incorporates sound-emitting direction regulating members with annular portions that project forward and surround the speakers' diaphragms, combined with a tensioned three-dimensional fabric that bites into these members, and a sound propagation preventing part filled with foam between adjacent members to regulate sound direction and prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If speakers are arranged close together in the headrest to save space, then the device complexity is reduced and space utilization is improved, but the stereo feeling deteriorates due to sound interference between speakers
Solution Approach 1:
A sound propagation preventing part is introduced as an intermediary element between the speakers. This part blocks sound waves from propagating directly between speakers, preventing interference while allowing each speaker's sound to reach the user independently, thus maintaining stereo feeling in a compact arrangement
Solution Approach 2:
The sound propagation preventing part is selectively placed only between the speakers, creating a localized sound isolation zone. This allows sound to propagate freely in other directions (toward the user) while blocking the harmful path between speakers, achieving spatially differentiated sound control
2Ease of manufacture
If a three-dimensional fabric is arranged in front of speakers without additional constraints, then the ease of manufacture is improved and structure is simplified, but acoustic characteristics deteriorate due to flapping at resonance frequencies
Solution Approach 1:
A sound propagation preventing part is introduced as an intermediary between the fabric and the sound field. This part prevents sound waves from directly exciting the fabric, eliminating flapping vibrations while allowing the fabric to remain in place for aesthetic and acoustic diffusion purposes
Solution Approach 2:
The problematic function of the fabric (acting as a sound reflector that causes flapping) is separated from its aesthetic function. The sound propagation preventing part takes over the sound control function, allowing the fabric to be simplified or removed from the acoustic path while maintaining its visual purpose
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
This configuration improves acoustic characteristics by preventing flapping and enhancing stereo feeling, even in limited spaces, by ensuring sound is emitted with higher sound pressure levels and reduced interference between speakers.
Implementation Method 1
a three-dimensional fabric that is tensioned and arranged in a state where each of the annular portions of each of the sound-emitting direction regulating members bites into the three-dimensional fabric
Implementation Method 2
a sound propagation preventing part that prevents the sound from propagating between the speakers, is provided between the annular portions of the adjacent sound-emitting direction regulating members
Data Source
AI summary
The present invention prevents a three-dimensional fabric arranged in front surfaces of speakers from flapping due to sound. In the respective front surface sides of, sound-emitting direction regulating members that include annular portions that project forward by a predetermined distance are arranged. A three-dimensional fabric is tensioned and arranged so as to cover the front surface sides of the sound-emitting direction regulating members. When the three-dimensional fabric is pressed against the annular portions configuring the sound-emitting direction regulating members, the annular portions bite into the three-dimensional fabric since the three-dimensional fabric has a predetermined thickness. The annular portions are provided so as to surround diaphragms of the speakers. Sound output from the speakers passes inside the annular portions. However, the periphery of a region of the three-dimensional fabric in which sound passes is supported by the biting of the annular portions, thereby preventing the three-dimensional fabric from flapping widely in response to the sound.