Net-Shaped Drum Surface Reducing Hit Sound
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Solution Overview
Problem
Conventional electronic percussion instruments fail to sufficiently reduce the hit sound due to shell resonance when the struck surface part is hit, as the cylindrical shell surrounding the back surface vibrates.
Innovation Solution
An electronic percussion instrument with a struck surface part formed into a dome shape and a net shape, secured to an annular frame, which diffuses vibrations and reduces resonance, allowing air to pass through the mesh during hitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cylindrical shell surrounds the back surface of the struck surface part, then the instrument structure is complete and stable, but the shell resonates with vibrations when hit, causing insufficient reduction of hit sound
Solution Approach 1:
The patent removes the cylindrical shell that surrounded the back surface of the struck surface part. By extracting this resonating component, the hit sound is effectively reduced while maintaining the essential annular frame structure that provides stability and support for the net-shaped struck surface part.
Solution Approach 2:
The struck surface part is formed as a net-shaped structure with porous characteristics. This net configuration allows air to pass through during hitting, diffuses vibrations, and reduces the hit sound without requiring a surrounding cylindrical shell, thus resolving the contradiction between hit sound reduction and structural complexity.
2Object-affected harmful factors
If the struck surface part is formed into a net shape, then air can pass through during hitting reducing hit sound, but the structure requires precise formation to maintain both net shape and dome shape
Solution Approach 1:
The struck surface part is formed into a dome shape with curved surface, which naturally distributes and diffuses vibration energy when hit. The net-shaped configuration combined with dome curvature allows air passage while the curved geometry helps manage the structural requirements, reducing the need for extremely high manufacturing precision while maintaining effectiveness.
Solution Approach 2:
The patent specifies that the net shape is formed by arranging rods at predetermined intervals, creating a porous structure. By controlling the rod arrangement parameters (interval, thickness, pattern), the structure achieves both the net shape for air passage and the dome shape for vibration diffusion, balancing manufacturing precision requirements with functional performance.
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
Effectively reduces the hit sound by diffusing vibrations around the frame, providing a responsive hitting feeling while ensuring safety and stability, and simplifying the instrument's structure.
Implementation Method 1
the struck surface part is formed into a net shape, and air passes through the mesh of the struck surface part during hitting, thereby reducing a hit sound
Implementation Method 2
A struck surface part formed into a dome shape and a net shape... effectively reduces the hit sound by diffusing vibrations around the frame
Data Source
AI summary
Electronic percussion instruments 3a to 3g each comprise a struck surface part 30 having a dome-shaped struck surface 30a and formed into a net shape, and a ring-shaped frame 31 connected to the outer edge of the struck surface part 30, and a region on the back surface 30b side of the struck surface part 30 is open. Consequently, unlike a case where the back surface side of a struck surface is surrounded by a cylindrical shell, for example, like conventional electronic percussion instruments simulating a drum, it is possible to prevent other members from being resonant with vibrations when the struck surface 30a is hit. Therefore, hit sound can be effectively reduced.