Curved Flexible Actuator Structure for High-Frequency Haptics
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Solution Overview
Problem
Existing flexible actuators face challenges in generating high vibration at higher frequencies and are difficult to apply to curved surfaces, leading to limited vibration magnitude and uncomfortable tactile sensations.
Innovation Solution
A flexible actuator for curved surfaces is designed with a substrate layer and an electroactive polymer composite film, featuring a flexible electrode layer and dielectric fluid, which allows for a wide range of vibration amplitude, frequency, and high vibration output using low voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a related-art actuator using an electroactive polymer is used, then vibration can be generated, but the magnitude of vibration is limited when driving at higher frequencies
Solution Approach 1:
The substrate layer and electroactive polymer composite film are configured with a curved shape instead of a flat structure. This curvature design enables the actuator to be applied to curved surfaces and optimizes the geometric relationship between the electroactive polymer composite film and electrode, allowing for smaller angles and improved vibration characteristics at higher frequencies
Solution Approach 2:
The distance between the electroactive polymer composite film and electrode is made smaller at the center portion compared to the peripheral portions. This non-uniform distance distribution creates localized variations in the electric field and mechanical stress, enhancing vibration magnitude at higher frequencies while maintaining overall system performance
2Adaptability or versatility
If a related-art flexible actuator is used, then it can provide vibration sensation, but it is difficult to apply to curved surfaces
Solution Approach 1:
The substrate layer and electroactive polymer composite film are both configured with curved shapes that match the target application surface. This curvature design allows the actuator to conform to curved surfaces such as steering wheels, significantly improving adaptability and ease of installation on non-planar surfaces
3Productivity
If a piezoelectric material is used to generate vibration, then vibration can be produced, but it causes uncomfortable tactile sensation due to foreign body feeling
Solution Approach 1:
The actuator uses a flexible substrate layer and electroactive polymer composite film structure with thin film configuration. This flexible thin-film design provides soft tactile sensation that reduces foreign body feeling while maintaining effective vibration generation capability, making it comfortable for direct contact applications
Solution Approach 2:
The electroactive polymer composite film combines electroactive polymer layers with flexible electrode layers and dielectric fluid. This composite material structure provides both the vibration generation capability of electroactive materials and the flexibility needed to reduce foreign body sensation, achieving a balance between performance and comfort
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 flexible actuator effectively operates at high frequencies, generates greater vibration at low voltage, and can be applied to curved surfaces without foreign body feelings, enabling various haptic feedback applications.
Implementation Method 1
the flexible electrode layer and the electrode are brought into contact in a direction from the center portions to the peripheral portions due to electrostatic attraction between the flexible electrode layer and the electrode when a voltage is applied
Data Source
AI summary
A flexible actuator for curved surfaces and a control method thereof is used for curved surfaces and generates high vibration using a relatively low voltage.