Electronic Keyboard External Member with Stepped Sound Radiation Frames
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Solution Overview
Problem
Existing external members with sound radiation holes, such as speaker covers, lack optimal design for enhancing sound directivity and strength while maintaining a compact size and aesthetic appeal in electronic instruments.
Innovation Solution
The design incorporates a frame portion with first and second hole frames, where the second hole frames have longer hole forming surfaces in the thickness direction, and a molding method using a core and cavity mold to create sound radiation holes with increased directivity and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hole forming surface length is increased to enhance sound directivity, then sound radiation performance is improved, but the frame portion thickness and overall size increase
Solution Approach 1:
The patent introduces a stepped configuration with multiple levels (first step and second step) in the hole forming surface, transforming a one-dimensional thickness increase into a multi-dimensional structured approach. This allows the sound radiation holes to achieve enhanced directivity through the stepped geometry without requiring a proportional increase in overall frame thickness, as the vertical stacking of steps utilizes the thickness dimension more efficiently.
Solution Approach 2:
The hole forming surface is segmented into multiple discrete steps (first step and second step) rather than being a continuous surface. This segmentation allows each step to contribute differently to sound radiation, enabling enhanced directivity through the cumulative effect of multiple surfaces while maintaining a compact overall thickness by distributing the functional requirements across separated levels.
2Reliability
If multiple sound radiation holes are added to improve sound distribution, then acoustic performance is enhanced, but the frame portion becomes more complex and harder to manufacture
Solution Approach 1:
The patent combines multiple sound radiation holes into a single integrated frame portion that is molded as one piece. The stepped configuration serves multiple holes simultaneously, and the entire structure including all holes and steps is formed in a single molding operation, eliminating the need for separate manufacturing steps for each hole or for post-molding assembly operations.
Solution Approach 2:
The stepped hole forming surfaces serve multiple functions: they provide sound radiation pathways for multiple holes, creates structural reinforcement within the frame, and enable varied sound radiation patterns from different levels. This multi-functionality is achieved within a single molded structure, reducing manufacturing complexity while enhancing acoustic performance.
3Strength
If the frame portion is made more robust to support additional features, then structural strength is improved, but the overall size and compactness are compromised
Solution Approach 1:
The stepped configuration introduces curved or angled transitions between steps rather than sharp直角 changes, distributing stress more evenly throughout the frame structure. This curved geometry provides structural reinforcement that enhances frame strength while maintaining a compact overall volume, as the curved surfaces efficiently transfer loads without requiring additional material thickness.
Data Source
AI summary
A rear panel of an electronic keyboard instrument has a frame portion including multiple sound radiation holes, and the frame portion has a first hole frame including a hole forming surface of the sound radiation hole and a second hole frame including a hole forming surface of the sound radiation hole which is longer in a thickness direction of the frame portion (a Y-axis direction) than the first frame.