Piezoelectric Droplet Head With Frequency-Matched Nozzle Diameter
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Solution Overview
Problem
Conventional liquid droplet discharging heads struggle to discharge sufficient amounts of liquid droplets at high driving frequencies, particularly when the natural frequency is increased beyond 40 kHz.
Innovation Solution
A liquid droplet discharging head with a channel member and a piezoelectric element, where the nozzle diameter and natural frequency are related by specific expressions to ensure sufficient droplet discharge at frequencies above 250 kHz and below 300 kHz, maintaining optimal droplet size and viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the natural frequency Fr is increased to achieve high-speed recording, then the driving frequency can be increased, but the liquid droplet discharge amount becomes insufficient
Solution Approach 1:
The patent applies parameter changes by establishing a specific mathematical relationship between nozzle diameter and natural frequency (0.0446×Fr+7.5 ≤ D ≤ 0.0446×Fr+13.5). This formula allows simultaneous optimization of both driving frequency and droplet discharge amount by adjusting these parameters together rather than independently, resolving the contradiction between high frequency operation and sufficient discharge quantity
Solution Approach 2:
The patent employs dynamics by making the nozzle diameter adaptable to the natural frequency through the established formula. The system dynamically adjusts the nozzle dimension based on the desired operating frequency, enabling the channel to maintain optimal performance across different driving frequencies while ensuring sufficient droplet discharge
2Productivity
If the natural frequency Fr is increased beyond 40 kHz, then high-speed recording is enabled, but the piezoelectric element rigidity increases and viscosity changes occur
Solution Approach 1:
The patent uses parameter changes by limiting the natural frequency to a specific range (250-300 kHz) and establishing a corresponding nozzle diameter formula. This constrained parameter adjustment prevents excessive rigidity increase in the piezoelectric element while maintaining high-speed recording capability, avoiding viscosity changes that would occur at higher frequencies
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 allows for high-speed recording with sufficient droplet discharge, preventing issues related to increased rigidity and viscosity changes in the piezoelectric element, ensuring high image quality and density.
Implementation Method 1
a piezoelectric element fixed to the channel member and configured to apply pressure to liquid inside the pressure chamber to discharge liquid droplets of the liquid from the nozzle
Data Source
AI summary
A liquid droplet discharging head includes: a channel member having a channel including a nozzle and a pressure chamber communicating with the nozzle; and a piezoelectric element fixed to the channel member and configured to apply pressure to liquid inside the pressure chamber to discharge liquid droplets of the liquid from the nozzle. A natural frequency Fr of the channel is not less than 250 kHz; and a diameter D [μm] of the nozzle has a relationship of the following expression (1) with the natural frequency Fr [kHz]: 0.0446×Fr+7.5≤0.0446×Fr+13.5 . . . (1).