Piezoelectric Inkjet Nozzle Sizing for High-Frequency Droplet Discharge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ink-jet recording apparatuses face challenges in discharging liquid droplets in sufficient amounts for high-speed recording and high-resolution imaging due to increased natural frequency, leading to reduced droplet discharge and potential image quality issues.
Innovation Solution
A liquid droplet discharging apparatus with a channel member and piezoelectric element configured to operate at a natural frequency of 120 kHz to 160 kHz, with nozzle diameters satisfying D≥0.0343×Fr+6.6979, enabling sufficient droplet discharge for recording resolutions of at least 1200 dpi.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the natural frequency Fr is increased to achieve high-speed recording, then the driving frequency is improved, but the amount of liquid droplet discharged from the nozzle is reduced
Solution Approach 1:
The patent establishes a specific mathematical relationship between nozzle diameter D and natural frequency Fr (D≥0.0343×Fr+6.6979) to optimize droplet discharge. By carefully selecting and adjusting these parameters within defined ranges, the system achieves both high driving frequency (120-160 kHz) and sufficient droplet amount for recording resolution of at least 1200 dpi
Solution Approach 2:
The patent dynamically adjusts the operating parameters by setting the natural frequency Fr within a specific range of 120 kHz to 160 kHz, rather than using a fixed frequency. This dynamic parameter selection allows the system to maintain optimal performance across varying operating conditions while ensuring sufficient droplet discharge volume
2Speed
If the natural frequency Fr is increased to achieve high driving frequency, then the speed is improved, but the recording resolution is compromised due to insufficient droplet amount
Solution Approach 1:
The patent optimizes the relationship between nozzle diameter D and natural frequency Fr using the formula D≥0.0343×Fr+6.6979. This parameter optimization ensures that even at high frequencies (120-160 kHz), the droplet amount remains sufficient to achieve recording resolution of at least 1200 dpi
Solution Approach 2:
The patent specifies that the recording resolution should be not less than 1200 dpi, indicating a target threshold rather than a maximum limit. This allows for excessive action where the system can achieve higher resolutions if needed, while guaranteeing the minimum required quality level
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 increased driving frequency and high recording resolution while ensuring stable droplet discharge and image quality, preventing excessive wetting and spreading, and maintaining consistent ink supply.
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 apparatus 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 liquid inside the channel is in a range of 120 kHz to 160 kHz, a recording resolution which is a resolution of an image to be recorded by the liquid droplets is not less than 1200 dpi; and a diameter D [μm] of the nozzle and the natural frequency Fr [KHz] satisfy: D≥0.0343×Fr+6.6979.