Inkjet Head Voltage Correction Segmentation
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Solution Overview
Problem
Inkjet printing technologies face challenges in minimizing the distinct boundary between printed areas before and after voltage corrections in industrial printers, due to temperature changes affecting ink ejection, leading to visible inconsistencies in printed materials.
Innovation Solution
A control system utilizing FPGAs and power supply circuits to incrementally correct voltages applied to piezoelectric elements based on temperature changes, connecting nozzles to power supply circuits in a specific order and adjusting correction times to minimize the impact on ink ejection rates, thereby reducing boundary visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If voltage correction is performed collectively and simultaneously for all piezoelectric elements, then temperature-induced ejection inconsistencies are corrected, but a distinct boundary appears between corrected and uncorrected areas on the printed material
Solution Approach 1:
The patent divides the correction process into multiple segments by grouping piezoelectric elements into different correction groups. Each group receives voltage corrections at different time points during the printing process, rather than correcting all elements simultaneously. This segmentation allows the correction boundary to be distributed and less noticeable across the printed material.
Solution Approach 2:
The patent implements dynamic correction timing where the correction process adapts to the printing progress. The control device supplies corrected drive signals to different groups of piezoelectric elements at different time points based on the printing process stage, making the correction process dynamic rather than static. This reduces the visibility of correction boundaries by aligning corrections with the natural progression of printing.
2Object-generated harmful factors
If voltage correction is delayed to reduce boundary visibility, then boundary distinctness is reduced, but temperature changes during the extended printing process cause new ejection inconsistencies
Solution Approach 1:
The patent performs preliminary temperature measurement before the printing process begins. Based on this initial temperature reading, the control device determines the appropriate correction timing and parameters in advance. This preliminary action allows the system to prepare correction strategies that account for temperature conditions without delaying the actual correction during printing.
Solution Approach 2:
The patent incorporates continuous temperature monitoring during the printing process. The control device receives temperature information from temperature measurement devices and uses this feedback to adjust the voltage correction signals supplied to piezoelectric elements in real-time. This feedback mechanism ensures that corrections remain effective despite temperature changes occurring during the extended printing process.
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 effectively reduces the distinctness of boundaries between corrected and uncorrected areas in printed images, enhancing image quality by gradually adjusting ink ejection in response to temperature changes, thus minimizing the impact on printed materials.
Implementation Method 1
a plurality of piezoelectric elements 11b for ejecting the liquid
Data Source
AI summary
A control system includes a control circuit. The control circuit is to be connected to a head unit including first driving elements and second driving elements. Based on an input print data, the control circuit applies a first signal to the first driving element and applies a second signal to the second driving elements. The control circuit changes the first signal to a third signal in a first time and changes the second signal to a fourth signal in a second time. Based on an input print data, the control circuit applies the third signal to the first driving element and applies the fourth signal to the second driving elements.