Ultrasonic Vibrator Resonant Frequency Adjustment
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Solution Overview
Problem
Conventional ultrasonic vibrators using piezoelectric elements face challenges in adjusting resonant frequency due to slight variations in dimensions, requiring precise adjustments to achieve desired values.
Innovation Solution
The ultrasonic vibrator design incorporates metal blocks, a driving piezoelectric element unit, and adjustment piezoelectric element units made of lithium niobate, with adjustable electrodes that can be short-circuited or opened to change Young's modulus, allowing for precise adjustment of resonant frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If piezoelectric elements are used for driving ultrasonic vibrator, then ultrasonic vibrations can be generated, but resonant frequency cannot be adjusted due to slight variations in dimension
Solution Approach 1:
The piezoelectric element is divided into a driving unit and an adjustment unit. The driving unit generates ultrasonic vibrations, while the adjustment unit (with adjustable electrodes that can be short-circuited or opened) modifies Young's modulus to tune the resonant frequency. This segmentation allows independent optimization of vibration generation and frequency adjustment.
Solution Approach 2:
The invention changes the physical state of the adjustment unit by switching electrodes between short-circuit and open states, which alters Young's modulus of the piezoelectric element. This parameter change enables resonant frequency adjustment without modifying the physical dimensions of the element, compensating for manufacturing variations.
2Adaptability or versatility
If adjustment electrodes are arranged over entire plane to adjust resonant frequency, then frequency tuning is possible, but device complexity increases
Solution Approach 1:
Instead of arranging adjustment electrodes over the entire plane, the invention places adjustment electrodes only in specific local regions (first and second regions) of the piezoelectric element. This localized electrode arrangement achieves frequency adjustment while minimizing device complexity and maintaining structural simplicity.
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
This design enables precise adjustment of resonant frequency, maintaining driving force and accommodating variations in dimensions, ensuring the ultrasonic vibrator operates within desired parameters.
Implementation Method 1
a driving unit that is arranged between the metal blocks and produces a piezoelectric effect to vibrate by application of an alternating voltage
Implementation Method 2
at least one adjustment unit that is arranged between the metal blocks and the driving unit in an insulated state and changes Young's modulus
Data Source
AI summary
An ultrasonic vibrator and an ultrasonic treatment device which can adjust a resonant frequency while maintaining driving force are provided. An ultrasonic vibrator 1 includes two metal blocks 2, a driving unit 3 that is arranged between the metal blocks 2 and produces a piezoelectric effect to vibrate by application of an alternating voltage, and at least one adjustment unit 4 that is arranged between the metal blocks 2 and the driving unit 3 in an insulated state and changes Young's modulus.