Vibration Panel Resonance Tuning for Low-Frequency Haptic Feedback
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Solution Overview
Problem
Existing vibration panels using piezoelectric sensors struggle to produce sufficient haptic feedback in the lower frequency range (within 1 kHz) due to fixed characteristic frequencies, which do not align with the sensitive frequency range of human tactile organs (400 Hz-600 Hz), leading to inadequate haptic reproduction in devices like buttons and keys.
Innovation Solution
Incorporating a regulation structure, including a support layer, weight layer, and regulation film layer, to adjust the characteristic frequency of the substrate, ensuring the resonant frequency aligns with the sensitive frequency range of human tactile organs, thereby enhancing haptic feedback effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piezoelectric sensor is used to drive substrate vibration, then haptic feedback can be generated, but the resonant frequency cannot be adjusted to match the sensitive frequency range of human tactile organs (400 Hz-600 Hz)
Solution Approach 1:
The patent applies parameter changes by modifying the physical properties of the substrate through adding regulation structures (support layers, weight layers, regulation film layers). These structures change the mass, stiffness, and damping parameters of the substrate system, thereby adjusting the resonant frequency to match the human tactile sensitive range of 400-600 Hz.
Solution Approach 2:
The patent uses composite material structures by combining the substrate with regulation layers made of different materials (support layer with specific elasticity, weight layer with specific density, regulation film layer). This composite structure allows independent optimization of mass and stiffness properties to achieve the desired resonant frequency while maintaining haptic feedback effectiveness.
2Reliability
If the substrate structure is fixed, then manufacturing is simplified, but the characteristic frequency cannot be regulated to align with human tactile sensitivity
Solution Approach 1:
The patent segments the substrate system into distinct functional layers: the base substrate, support layer, weight layer, and regulation film layer. Each layer has a specific function and can be independently designed, manufactured, and adjusted. This segmentation allows the characteristic frequency to be regulated through layer configuration without requiring complete redesign of the entire substrate structure.
Solution Approach 2:
The patent introduces dynamic adjustability by making the regulation structure configurable. The support layer, weight layer, and regulation film layer can be adjusted in terms of material properties, thickness, and distribution to dynamically regulate the resonant frequency according to different application requirements, transforming a static structure into a dynamically adjustable system.
3Reliability
If the resonant frequency is outside the sensitive frequency range, then manufacturing is easier, but haptic reproduction quality is insufficient
Solution Approach 1:
The patent applies preliminary action by pre-designing the regulation structure with specific mass and stiffness characteristics during the manufacturing process. The support layer, weight layer, and regulation film layer are configured in advance to achieve the target resonant frequency within the 400-600 Hz range, eliminating the need for post-manufacturing frequency adjustment and simplifying the overall manufacturing process.
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 regulation structure allows the vibration panel to produce effective haptic feedback in the lower frequency range, improving user experience by aligning the resonant frequency with human tactile sensitivity, thus enhancing the haptic reproduction device's performance.
Implementation Method 1
a piezoelectric sensor located on one side of the substrate, where the piezoelectric sensor driven by an excitation signal is configured to vibrate, and to drive the substrate to vibrate
Implementation Method 2
a regulation structure, where the regulation structure is configured to regulate a characteristic frequency of the substrate, so as to make a resonant frequency of the substrate satisfy a preset range
Data Source
AI summary
Embodiments in the present disclosure provide a vibration panel and a drive method therefor, and a haptic feedback device. The vibration panel includes: a substrate; a piezoelectric sensor located on one side of the substrate, where the piezoelectric sensor driven by an excitation signal is configured to vibrate, and to drive the substrate to vibrate; and a regulation structure, where the regulation structure is configured to regulate a characteristic frequency of the substrate, so as to make a resonant frequency of the substrate satisfy a preset range.