Film-Shaped Piezoelectric Sensor for Percussion Vibration Detection

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Solution Overview

Problem

Conventional detection devices for musical instruments, such as those using piezo sensors, often detect vibrations other than the intended resonance sound due to air propagation, leading to interference from unwanted vibrations.

Innovation Solution

A detection device comprising a film-shaped base with a curved shape in contact with a percussion instrument's head, featuring a film-shaped piezoelectric sensor that follows the curvature of the head's vibration, effectively isolating the intended vibration while preventing the detection of unwanted vibrations through its deformation characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a piezoelectric sensor is used to detect vibrations of a percussion instrument head, then the vibration detection capability is improved, but unwanted vibrations detected through air propagation interfere with the detection accuracy

Engineering Contradiction:

Improvevibration detection accuracyVSAvoidinterference from unwanted vibrations

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

A film-shaped base is introduced as an intermediary component between the piezoelectric sensor and the percussion instrument head. This base serves as a mediator that selectively transmits vibrations: it directly contacts the head to transmit intended vibration signals while its film structure and curvature design prevent it from acting as an antenna for airborne unwanted vibrations, thus filtering out interference before signals reach the sensor

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention employs a film-shaped base with specific curvature that conforms to the head surface. This thin film structure has mechanical properties that allow it to follow the curvature changes of the head during vibration while being too flexible and thin to effectively couple with airborne vibrations, thereby naturally filtering unwanted vibration modes and directions

Inventive Principle:

Principle #30Flexible shells and thin films

2Measurement precision

If a conventional piezoelectric sensor is attached directly to the percussion instrument head, then the detection sensitivity is improved, but the sensor structure becomes complex and difficult to install

Engineering Contradiction:

Improvedetection sensitivityVSAvoidsensor structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The invention merges multiple functions into a single integrated component: the film-shaped base simultaneously serves as the mounting substrate for the piezoelectric sensor, the interface element that contacts the percussion head, and the vibration filtering mechanism. This integration eliminates the need for separate mounting brackets, adhesives, and alignment fixtures, greatly simplifying the overall device structure and installation process

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The film-shaped base is designed to perform multiple functions: it provides mechanical support for the sensor, ensures intimate contact with the curved head surface, filters unwanted vibrations, and maintains sensor alignment. This multi-functional design replaces what would otherwise require multiple separate components, reducing device complexity while maintaining detection sensitivity

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If a film-shaped base with curved shape is used to contact the percussion instrument head, then the fidelity of detected signal is improved, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvesignal fidelityVSAvoidcurved shape accuracy

Core Design Contradiction:

Measurement precisionVSManufacturing precision

Solution Approach 1:

The invention specifies optimal parameter ranges for the film-shaped base (thickness, curvature radius, material properties) that balance manufacturing feasibility with performance. By defining these parameters within practical ranges rather than exact values, the design allows for normal manufacturing tolerances while still achieving the desired signal fidelity and vibration filtering effects

Inventive Principle:

Principle #35Parameter changes

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

The solution enables precise detection of the intended vibration, reducing interference from other vibrations and enhancing the fidelity of the detected signal, particularly in low and high-frequency regions, while maintaining minimal damping of the instrument's original vibration.

Implementation Method 1

a film-shaped piezoelectric sensor disposed on the base

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentUS20220148548A1Detection device, percussion instrument, and detection method

Publication Date: 2022.05.12 ROLAND CORP

AI summary

The disclosure provides a detection device, a percussion instrument, and a detection method. The percussion instrument includes a head; a base that has at least a portion formed in a curved shape and that is in contact with the head in a direction in which a curvature of the curved shape is changed with a vibration of the head; and a film-shaped piezoelectric sensor disposed on the base.