Liquid Ejecting Head Vibration Plate Segmentation
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Solution Overview
Problem
Ink jet printing heads face challenges in maintaining high-speed continuous ejection of ink droplets due to reduced resonance frequency caused by attempts to lower the Young's modulus of vibration plates, affecting the weight and flying speed of ejected droplets.
Innovation Solution
A liquid ejecting head design featuring a vibration plate structure with a first, second, and third vibration plate, where the piezoelectric layer and third vibration plate are stacked only at the central portion, and not at the rim portions, with one plate having compressive stress and the other tensile stress, and the third vibration plate having a higher Young's modulus than the first two, to enhance displacement and resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the Young's modulus of the vibration plate is reduced to increase ink droplet weight, then the ink droplet weight increases, but the resonance frequency of the vibration plate decreases
Solution Approach 1:
The vibration plate is divided into multiple plates (first, second, and third vibration plates) with different Young's moduli. The third vibration plate has a higher Young's modulus than the first and second plates, creating a segmented structure that allows different regions to contribute differently to both droplet weight and resonance frequency
Solution Approach 2:
Different regions of the vibration plate structure are given different local properties. The first and second vibration plates have lower Young's modulus to increase droplet weight, while the third vibration plate has higher Young's modulus to maintain resonance frequency. This local differentiation resolves the contradiction between weight and frequency
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 configuration improves the displacement and resonance frequency of the vibration plate, allowing for increased ink droplet weight and flying speed while preventing reduction in resonance frequency, enabling continuous high-speed ejection.
Implementation Method 1
a piezoelectric actuator including a first electrode, a piezoelectric layer, and a second electrode being stacked in this order
Data Source
AI summary
A liquid ejecting head includes a pressure chamber, a vibration plate including a first vibration plate, a second vibration plate, and a third vibration plate, and a piezoelectric actuator, being stacked in this order. A portion where the piezoelectric layer and the third vibration plate are stacked in a first direction on the first vibration plate and the second vibration plate, and a portion where the piezoelectric layer and the third vibration plate are not stacked are provided. One of the first vibration plate and the second vibration plate has a compressive stress and another one of the first vibration plate and the second vibration plate has a tensile stress. A Young's modulus of the third vibration plate is larger than Young's moduli of the first vibration plate and the second vibration plate.