Electronic Percussion Rim Sensor Vibration Path Inversion
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Solution Overview
Problem
Existing electronic percussion instruments face difficulties in efficiently transmitting vibration from the rim to the rim sensor due to a longer vibration transmission path and the buffering effect of the rim's elastic material, which results in inefficient detection and a softer striking feel compared to acoustic drums.
Innovation Solution
The design includes a rim sensor positioned on the cylindrical body part with a film part that directly supports the rim, allowing vibrations to be transmitted efficiently through the film part, and a rubber-like elastic rim with a solid form to reduce elastic deformation and enhance striking force transmission, while maintaining a high hardness for durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rim cover is fitted to an outer peripheral part that protrudes radially outward from the head support member, then the hoop can be protected from being struck, but the vibration transmission path from the rim cover to the rim sensor becomes longer and vibration transmission efficiency deteriorates
Solution Approach 1:
The patent inverts the conventional configuration by positioning the rim on the inner circumferential side of the hoop rather than the outer side. The rim sensor is also repositioned to be supported on the outer circumferential side of the head support member, creating a reversed arrangement that shortens the vibration transmission path while maintaining protection functionality.
Solution Approach 2:
The patent changes the spatial dimension of rim placement from radial outward position to radial inward position relative to the hoop. This dimensional repositioning allows the rim to be closer to the head support member, thereby reducing the vibration transmission distance without compromising the protective function.
2Reliability
If the rim is made with rubber-like elastic material, then the rim can be durable and reduce striking sound, but the elastic material buffers vibration and reduces vibration transmission efficiency to the rim sensor
Solution Approach 1:
The patent specifies that the rim be made of rubber-like elastic material with a hardness of 70 degrees or more on the Shore A scale. This parameter change in material hardness allows the rim to maintain durability and protective function while reducing excessive elastic deformation that would buffer vibration, thereby improving vibration transmission efficiency to the sensor.
3Device complexity
If the rim sensor is supported on the inner circumferential side of the head support member, then the device structure is simplified, but the vibration transmission path from the rim to the sensor becomes longer and detection precision deteriorates
Solution Approach 1:
The patent inverts the conventional sensor positioning by supporting the rim sensor on the outer circumferential side of the head support member rather than the inner circumferential side. This inversion shortens the vibration transmission path from the rim to the sensor, improving vibration detection precision while maintaining structural simplicity.
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 enables efficient vibration transmission to the rim sensor, reducing erroneous noise detection and maintaining a realistic striking feel similar to acoustic drums, with improved durability and reduced product size.
Implementation Method 1
a film part that directly supports the rim, allowing vibrations to be transmitted efficiently through the film part
Implementation Method 2
a rubber-like elastic rim with a solid form to reduce elastic deformation and enhance striking force transmission
Data Source
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AI summary
There is provided an electronic percussion instrument including: a body part (2) having an opening on at least one end side of the body part (2); a head (3) that covers the opening of the body part (2); a hoop (4) for applying tension to the head (3), a rim (5) which is disposed on an inner circumferential side of the hoop (4) and of which an upper end is positioned above an upper end of the hoop (4) and of which a bottom surface is supported on an edge of the opening of the body part (2) via the head (3); and a rim sensor (S1) that detects vibration generated when the rim (5) is struck and is disposed in the body part (2).