Piezoelectric Vibration Panel for Ultrasonic Standing Waves
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Solution Overview
Problem
Existing touch panels struggle to generate standing waves in the ultrasonic region, leading to increased voltage requirements and issues with reliability and power consumption due to heat generation, especially when it is difficult to produce standing waves.
Innovation Solution
A panel with a vibration plate and a piezoelectric actuator, where the length and logarithmic decrement of the vibration plate satisfy a specific expression, and the piezoelectric actuator's width is optimized relative to the standing wave wavelength to achieve efficient vibration and generate a tactile sense with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage is increased to generate standing waves in panels difficult to vibrate, then the tactile sense generation is improved, but the reliability decreases and power consumption increases due to heat generation
Solution Approach 1:
The patent changes the physical parameters of the vibration plate (material composition, thickness, shape) to optimize its vibrational characteristics. By adjusting these parameters, the panel can generate standing waves at ultrasonic frequencies with lower input voltage, thereby reducing power consumption and heat generation while maintaining reliability
Solution Approach 2:
The patent employs composite materials for the vibration plate, combining materials with different properties to achieve optimal vibrational characteristics. The composite structure allows for better control of standing wave generation, reducing the need for high voltage input and consequently lowering power consumption and heat generation
2Reliability
If the voltage is increased to generate standing waves in panels difficult to vibrate, then the tactile sense generation is improved, but the heat generation increases
Solution Approach 1:
The patent optimizes the vibrational parameters of the panel by adjusting the vibration plate's material properties, thickness, and geometry. These parameter changes enable efficient standing wave generation at ultrasonic frequencies with minimal energy loss, thereby reducing heat generation while maintaining effective tactile sense generation
Solution Approach 2:
The patent utilizes mechanical vibration principles to generate standing waves in the vibration plate. By carefully designing the plate's dimensions and material properties, the system achieves resonance at ultrasonic frequencies, efficiently converting electrical energy to mechanical vibration with minimal heat generation
3Reliability
If standing waves are generated in panels with unsuitable physical properties, then the tactile sense is improved, but the voltage requirement increases
Solution Approach 1:
The patent systematically adjusts the physical parameters of the vibration plate (material composition, thickness, shape factors) to optimize its mechanical impedance and vibrational characteristics. These parameter changes enable the panel to generate standing waves at ultrasonic frequencies with lower voltage requirements while maintaining effective tactile sense generation
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 the panel to effectively vibrate at ultrasonic frequencies, generating standing waves with improved tactile feedback and reduced heat generation and power consumption, enhancing user experience while maintaining reliability.
Implementation Method 1
a piezoelectric actuator that is provided on a main surface of the vibration plate and causes the vibration plate to vibrate
Implementation Method 2
capable of vibrating at a frequency in the ultrasonic wave/ultrasonic region to generate standing waves
Data Source
AI summary
A panel includes a vibration plate having a generally rectangular shape; and a piezoelectric actuator that is provided on a main surface of the vibration plate and causes the vibration plate to vibrate, in which the vibration plate is configured such that a length x in mm of a long side of the vibration plate and logarithmic decrement y of the vibration plate satisfy Expression 1 below:y≤32.6x−1 (Expression 1).