Electronic Percussion Cover Deformation for Stroke Detection
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Solution Overview
Problem
Conventional electronic percussion instruments face reduced stroke detection accuracy due to obstructed elastic deformation at the inner circumferential side of the cover when the outer edge is struck, caused by the connection of concave and convex parts on the lower surface of the frame.
Innovation Solution
A disk-shaped frame with a concave part at the outer edge and a sensor within it, where the cover has a protrusion part that protrudes from its lower surface and is designed with a gap between the protrusion and the sensor, allowing for consistent thickness in regions without protrusions, enabling effective deformation and improved stroke detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the concave part and convex part are formed on the lower surface of the frame to prevent deviation, then the positional stability is improved, but the elastic deformation is obstructed and stroke detection accuracy decreases
Solution Approach 1:
The cover is divided into two regions: a first region with a protrusion part for pressing the sensor, and a second region without the protrusion part that maintains constant thickness. This segmentation allows the second region to deform elastically without obstruction while the first region provides the pressing function, resolving the contradiction between positional stability and deformation freedom.
Solution Approach 2:
Different regions of the cover are given different thickness characteristics: the first region has a protrusion part that varies in thickness to enable sensor pressing, while the second region maintains constant thickness to ensure elastic deformation. This local differentiation allows each region to fulfill its specific function without interfering with the other.
2Measurement precision
If the protrusion part is formed close to the sensor to improve detection sensitivity, then the sensitivity is improved, but the gap may be eliminated causing erroneous detection
Solution Approach 1:
The gap between the protrusion part and sensor is designed to be dynamic rather than fixed: it exists in the non-struck state to prevent erroneous detection, and is eliminated during stroke detection to ensure accurate sensing. This dynamic adjustment of the gap resolves the contradiction between sensitivity and reliability.
Solution Approach 2:
The protrusion part is designed to occasionally contact the sensor (excessive action) during normal operation to ensure reliable detection, while the gap prevents continuous contact (partial action) that would cause erroneous detection. This controlled excess and partial action resolves the contradiction between sensitivity and accuracy.
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
Enhances stroke detection accuracy by ensuring the protrusion part is adequately pressed against the sensor, even with weak strokes, and prevents erroneous detection by maintaining a gap between the protrusion and sensor, thus improving sensitivity and accuracy.
Implementation Method 1
when the outer edge part of the cover is struck, the stroke is detected in such a manner that the protrusion part is pressed to the sensor according to elastic deformation of the cover
Data Source
AI summary
An electronic percussion instrument, a stroke detection device, and a stroke detection method which can improve stroke detection accuracy are provided. A thickness dimension (L2) of an upper cover part (5b1) is approximately constant from the inner circumferential side to the outer circumferential side in a region facing the upper surface of an outer circumferential part (4b3) of the frame bow part (4b) (a concave part formed according to a level difference between a bent part (4b2) and the outer circumferential part (4b3)). Accordingly, the entire upper cover part (5b1) is easily deformed such that it is bent when struck, and thus a protrusion part (5b3) can be securely pressed to an edge sensor (7b) according to deformation of the upper cover part (5b1). Therefore, the accuracy of detection of a stroke applied to the upper cover part (5b1) can be improved.