Electrostatic Sound Pressure-Electrical Signal Conversion Device
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Solution Overview
Problem
In electrostatic type sound pressure-electrical signal conversion devices, high drive voltage is required due to the need for insulation between the diaphragm and electrodes, and this issue is exacerbated in three-dimensionally deformable sheet-shape devices that require sufficient insulation even during deformation.
Innovation Solution
A sound pressure-electrical signal conversion device is designed with a polymer sheet sandwiched between a pair of electrodes, where the polymer sheet is a dielectric film, and at least one electrode includes an insulating flexible substrate with through-holes and conductive fibers fixed to the substrate, allowing for in-plane electrical conduction and reduced drive voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating separator is interposed between the vibrating body and electrode in an electrostatic speaker, then insulation is ensured, but the drive voltage becomes high
Solution Approach 1:
The patent removes the insulating separator from the structure, allowing the vibrating body to be in direct contact with the electrode. This eliminates the insulation barrier that caused high drive voltage requirements, while the vibrating body itself serves as the insulating element through its material properties and geometric configuration
Solution Approach 2:
The vibrating body is designed as a thin film structure that provides both the necessary mechanical flexibility for vibration and electrical insulation properties. This thin film replaces the traditional insulating separator while enabling direct contact between the vibrating body and electrode, thereby reducing drive voltage
2Reliability
If sufficient insulation is ensured in a sheet-shape electrostatic conversion device, then reliability is improved, but the device complexity increases
Solution Approach 1:
The vibrating body serves multiple functions simultaneously: it acts as the acoustic diaphragm for sound pressure conversion, provides electrical insulation between the electrodes, and maintains structural integrity during three-dimensional deformation. This multi-functionality eliminates the need for separate insulating components, reducing device complexity while maintaining reliability
Solution Approach 2:
The patent utilizes the material properties and geometric parameters of the vibrating body (such as thickness, material composition, and surface treatment) to provide adequate insulation. By optimizing these parameters, the vibrating body itself becomes sufficient for insulation purposes without requiring additional insulating layers or complex insulation structures
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 three-dimensional deformation without significant changes in frequency characteristics, reduces the drive voltage, and maintains operational stability, making it suitable for various applications.
Implementation Method 1
an electrostatic type (capacitor type) speaker that forms sound pressure in a space using electrostatic force (Coulomb force)
Implementation Method 2
a vibrating body is vibrated by a change in electrostatic force acting on the vibrating body to form sound pressure in the space
Implementation Method 3
the conductive fibers are vibrated by receiving sound pressure to cause the pair of electrodes to output an electrical signal
Data Source
AI summary
Provided is a sheet-shape electrostatic sound pressure-electrical signal conversion device that is three-dimensionally deformable and has a low drive voltage.The sound pressure-electrical signal conversion device includes a polymer sheet sandwiched between a pair of electrodes facing each other, the polymer sheet is a dielectric film, at least one of the electrodes includes an insulating flexible substrate having a plurality of through-holes and a plurality of conductive fibers having one end fixed to the flexible substrate with a pressure sensitive adhesive, electrical conduction in an in-plane direction is formed by contact between the conductive fibers, the conductive fibers are vibrated by giving an electrical signal to the pair of electrodes or the conductive fibers are vibrated by receiving sound pressure to cause the pair of electrodes to output an electrical signal.