Liquid Discharge Electrode Voltage Control for Crosstalk Reduction
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Solution Overview
Problem
Liquid discharge apparatuses using the electrostatic attraction method face challenges with electric field crosstalk, causing droplet trajectory displacement and landing position inaccuracies, which existing shielding configurations only partially address due to complexity and incomplete field shielding.
Innovation Solution
A liquid discharge apparatus with a control unit that adjusts the voltage applied to electrodes, determining whether to operate as discharging or non-discharging electrodes based on adjacent electrode voltages, effectively reducing electric field crosstalk by optimizing potential differences between electrodes and the common electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conductor plate for shielding electric field is provided between printing electrodes, then electric field crosstalk is reduced to some extent, but the effect of shielding is small in leading edge portions and droplet trajectory displacement still occurs
Solution Approach 1:
The patent changes the voltage parameter of non-discharging electrodes dynamically based on the discharge state of adjacent electrodes. When an adjacent electrode is in discharge state, the voltage of the non-discharging electrode is adjusted to a first value; when not in discharge state, it is adjusted to a second value. This parameter change compensates for electric field crosstalk effects and corrects droplet trajectory displacement without requiring additional shielding structures.
2Object-affected harmful factors
If grid electrode or shielding electrode is provided between printing electrode and common electrode, then electric field crosstalk is prevented, but the configuration becomes complicated
Solution Approach 1:
The patent employs self-service by having the control unit automatically adjust the voltage of non-discharging electrodes based on the discharge states of adjacent electrodes. The system uses existing electrode structures and control circuitry to compensate for crosstalk effects, eliminating the need for additional grid electrodes or shielding structures. This approach achieves crosstalk prevention while maintaining simple device configuration.
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 approach significantly reduces droplet landing position displacement, improving image quality by canceling Coulomb forces and maintaining a simple configuration, achieving better accuracy than comparative examples.
Implementation Method 1
In a liquid discharge apparatus using the electrostatic attraction method, force generated by an electric field formed between a printing electrode and a common electrode is used to attract liquid
Implementation Method 2
electric fields between adjacent printing electrodes act on each other to change a potential distribution in a space where the droplet is ejected
Data Source
AI summary
liquid discharge apparatus includes a liquid discharge head including a plurality of electrodes arranged in parallel, a common electrode positioned to face the liquid discharge head, and a control unit configured to control a voltage to be applied to each of the plurality of electrodes to control the plurality of electrodes as a discharging electrode, which is to discharge a liquid, or as a non-discharging electrode, which is to discharge no liquid, wherein the control unit adjusts a value of the voltage to be applied to the electrode that is to be driven as the non-discharging electrode, based on the voltage to be applied to the electrode adjacent to the electrode that is to be driven as the non-discharging electrode.