Headrest Bone Conduction System Single PCB Assembly
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Solution Overview
Problem
Existing headrests with bone conduction two-way sound transmission systems are either inefficient and uncomfortable or overly complex, leading to increased manufacturing costs and risks of errors during assembly, while also failing to provide optimal sound quality and user comfort.
Innovation Solution
A headrest design featuring bone conduction loudspeakers and microphones mounted on a single printed circuit board, allowing for a compact, reliable, and efficient sound transmission system with a movable portion that can be adjusted to optimize contact with the occipital region of the user's skull, reducing interference and enhancing sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bone conduction loudspeakers and microphones are mounted separately in the headrest, then assembly is straightforward, but manufacturing time increases and assembly errors are more likely
Solution Approach 1:
The patent combines multiple bone conduction loudspeakers and microphones onto a single printed circuit board (PCB), integrating what would otherwise be separate mounting operations into one unified assembly unit. This merging reduces the number of discrete assembly steps, minimizes positioning errors, and accelerates manufacturing while maintaining reliable electrical connections and acoustic performance
2Reliability
If multiple bone conduction devices are installed in the headrest, then sound transmission quality improves, but device complexity and manufacturing costs increase
Solution Approach 1:
Multiple bone conduction loudspeakers and microphones are integrated onto a single printed circuit board, consolidating what would be separate components into one unified assembly. This reduces structural complexity, simplifies mounting requirements, and lowers manufacturing costs while preserving the enhanced sound transmission quality achieved through multiple devices
Solution Approach 2:
The printed circuit board serves multiple functions simultaneously: it provides structural support for mounting the bone conduction devices, establishes electrical connections between all components, and enables integrated control of multiple loudspeakers and microphones. This multi-functionality reduces the need for additional mounting brackets, wiring harnesses, and control circuitry
3Reliability
If the headrest contacts the occipital region firmly, then bone conduction sound quality improves, but user comfort decreases
Solution Approach 1:
The headrest employs differentiated contact mechanisms: the bone conduction interface at the occipital region provides firm, stable contact optimized for acoustic transmission, while other portions of the headrest maintain softer, more comfortable contact characteristics. This localized optimization allows high-quality bone conduction sound transmission without compromising overall user comfort
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 design minimizes manufacturing time and costs, reduces the risk of human errors, and provides high-quality sound transmission while ensuring user comfort and privacy, with improved sound-to-noise ratio and reduced mechanical stresses.
Implementation Method 1
Bone conduction is a well-known phenomenon by which sound is transmitted to the inner ear through the bones of the skull (instead of through the air)
Implementation Method 2
Bone conduction is a well-known phenomenon by which sound is transmitted to the inner ear through the bones of the skull (instead of through the air)
Data Source
AI summary
A sound transmission system for a headrest has a bone conduction speaker and bone conduction microphone mounted on the same printed circuit board. Additional components of the bone conduction two-way sound transmission system, such as a control unit, contact sensors or proximity sensors, and an antenna for communication with external electronic devices can be mounted on the same printed circuit board.