Vibration Presentation Device Actuator Pre-Compression
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Solution Overview
Problem
Existing vibration presentation devices using electrostatic or piezoelectric actuators face limitations in achieving large vibration amplitudes without increasing size, and require immediate response to external pressing forces.
Innovation Solution
A vibration presentation device comprising an electrostatic or piezoelectric actuator with a dielectric or piezoelectric sheet between electrode sheets, laminated with elastic bodies and a cover that compresses the actuator, allowing for efficient vibration transmission and a sensor to detect pressing forces for immediate actuator drive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single electrostatic or piezoelectric actuator is used, then the device structure is simple, but the vibration amplitude is small
Solution Approach 1:
The actuator is divided into multiple independent actuator units, each comprising electrode sheets and dielectric sheets laminated in sequence. Multiple actuator units are arranged in parallel to collectively generate larger vibration amplitudes while maintaining individual unit simplicity
Solution Approach 2:
Multiple actuator units are combined in parallel configuration, where each unit consists of electrode sheets and dielectric sheets. The combined action of multiple units produces enhanced vibration amplitude compared to a single actuator, resolving the contradiction between structural simplicity and vibration output
2Force
If the actuator size is increased to achieve large vibration amplitude, then the vibration amplitude increases, but the device size increases
Solution Approach 1:
The actuator adopts a laminated structure with electrode sheets and dielectric sheets stacked in the thickness direction. This multi-dimensional arrangement allows multiple actuator units to be compactly integrated, generating large vibration amplitudes without proportionally increasing the overall device volume
Solution Approach 2:
The actuator uses composite structures combining conductive electrode sheets with elastic or piezoelectric dielectric sheets. This composite material approach enables efficient vibration generation in a compact form factor, achieving large amplitude without proportional size increase
3Device complexity
If the actuator is not pre-compressed, then the structure is simple, but the response to pressing force is delayed
Solution Approach 1:
The actuator is pre-compressed by elastic bodies in the thickness direction before operation. This preliminary compression positions the actuator in an optimal initial state, enabling immediate and rapid response to external pressing forces without structural complexity increase
4Speed
If elastic bodies are added to compress the actuator, then the response speed increases, but the device complexity increases
Solution Approach 1:
Elastic bodies in the form of thin, flexible sheets are used to compress the actuator units. These thin-film elastic components provide the necessary pre-compression force while occupying minimal space and adding minimal structural complexity, enabling fast response speed
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
Enables the presentation of large vibrations efficiently without size increase, with enhanced responsiveness to pressing forces, allowing direct application of vibration to the source.
Implementation Method 1
an electrostatic or piezoelectric actuator that includes a first electrode sheet, a second electrode sheet, and a dielectric sheet or a piezoelectric sheet disposed between the first electrode sheet and the second electrode sheet
Implementation Method 2
an electrostatic or piezoelectric actuator that includes a first electrode sheet, a second electrode sheet, and a dielectric sheet or a piezoelectric sheet disposed between the first electrode sheet and the second electrode sheet
Implementation Method 3
a first elastic body laminated on the actuator; a second elastic body laminated on the actuator on the opposite side to the first elastic body; a cover that holds the first elastic body and the second elastic body such that an actuator laminate formed by the actuator, the first elastic body, and the second elastic body is compressed
Implementation Method 4
an electrostatic or piezoelectric sensor disposed around the actuator inside the cover
Implementation Method 5
an electrostatic or piezoelectric sensor disposed around the actuator inside the cover
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A vibration presentation device 1 includes: an electrostatic or piezoelectric actuator (10); a first elastic body (40) laminated on the actuator (10); a second elastic body (50) laminated on the actuator (10) on the opposite side to the first elastic body (40); an electrostatic or piezoelectric sensor (60) disposed around the actuator (10); a cover (70) that holds the first elastic body (40) and the second elastic body (50) such that the first elastic body (40) and the second elastic body (50) are compressed more than the actuator (10), the cover (70) transmitting, when a pressing force in the laminate direction is applied to the cover (70) from the outside, the pressing force to a sensor (60), and vibrating by vibration generated by the actuator (10); and a control device (90) that drives the actuator (10) when the sensor (60) detects the pressing force.