Keyboard Housing Protrusions for Sound Absorber Mounting
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Solution Overview
Problem
Electronic keyboard musical instruments face challenges in achieving enhanced acoustic characteristics while minimizing structural complexity, particularly in suppressing sound leakage and interference between left and right side walls, which complicates the design and makes it difficult to create a portable instrument.
Innovation Solution
The design incorporates a housing with protruding portions that serve both as reinforcing elements and holders for sound absorbers, allowing for improved acoustic characteristics without increasing structural complexity, by positioning sound absorbers outward of the speakers and using ribs for stability and attachment, thus enhancing the instrument's rigidity and sound emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sound absorbers are mounted in the housing to improve acoustic characteristics, then acoustic characteristics are improved, but the structure becomes complicated due to the need for dedicated holding mechanisms
Solution Approach 1:
The protruding portions serve dual functions: they reinforce the housing structure (increasing rigidity) and simultaneously hold the sound absorbers in position. This eliminates the need for separate holding mechanisms, reducing structural complexity while maintaining acoustic performance.
Solution Approach 2:
The housing reinforcement structure and sound absorber holding structure are merged into a single integrated protruding portion. This combination reduces the total number of components and simplifies the overall structure while achieving both structural and acoustic goals.
2Object-affected harmful factors
If the left and right side walls are made heavier and thicker to suppress sound leakage, then sound leakage is reduced, but the instrument becomes less portable
Solution Approach 1:
The sound absorption function is extracted from the side walls themselves and implemented through separate sound absorber elements positioned in front of the speakers. This allows the side walls to remain lightweight while still achieving sound leakage suppression through the combination of wall structure and absorber materials.
Solution Approach 2:
Sound absorber materials are introduced as intermediary elements between the speakers and the external environment. These absorbers effectively reduce sound leakage without requiring the side walls to be made heavier or thicker, thus maintaining portability.
3Reliability
If reinforcing members are attached to the sound absorber to maintain its shape, then acoustic characteristics are stabilized, but the number of components increases
Solution Approach 1:
The reinforcing function is merged with the holding function in the protruding portions. The same structural elements that hold the sound absorbers also provide the necessary reinforcement to maintain their shape, eliminating the need for separate reinforcing members.
Solution Approach 2:
The protruding portions are designed to perform multiple functions simultaneously: structural reinforcement, sound absorber positioning, and shape maintenance. This multi-functionality reduces the total component count while ensuring acoustic stability.
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 solution effectively improves acoustic characteristics by reducing sound leakage and interference, particularly in the bass range, while maintaining a compact and portable design by using protruding portions to hold sound absorbers and reinforce the housing, thereby stabilizing the sound absorbers without the need for additional fixing mechanisms.
Implementation Method 1
a sound absorber disposed outward of the speaker in the key arrangement direction
Data Source
AI summary
An electronic keyboard musical instrument, including: a housing having a lower casing having a bottom wall and an upper casing having a top wall, left and right walls being formed on at least one of the top wall and the bottom wall; a keyboard portion held by the housing; at least one speaker disposed at at least one end portion of the housing in its key arrangement direction, such that its sound emission surface faces rearward; a sound adjuster disposed in the housing so as to be located outward of the speaker in the left-right direction; and a plurality of protruding portions formed at the one end portion so as to protrude from the at least one of the top and bottom walls, wherein the sound adjuster is held by at least one of the protruding portions.