Method and apparatus for droplet deposition

The controller for droplet ejection systems addresses drop placement errors by managing drive waveform transitions, ensuring consistent polarity and reducing errors in droplet placement.

WO2025068722A1 Publication Date: 2025-04-03XAAR TECH LTD
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Patent Information

Application Number
PCT/GB2024/052508
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-29
Filing Date
2024-09-27
Publication Date
2025-04-03

AI Technical Summary

Technical Problem

The existing droplet ejection systems are susceptible to drop placement errors due to changes in the polarity of the drive waveform between consecutive pixel lines, leading to inconsistencies in droplet velocity and placement.

Method used

A controller is introduced to manage the ejection of droplets by receiving input pixel data, assigning each fluid chamber as either a firing or non-firing chamber, and allocating specific drive waveforms to the actuator walls of the firing fluid chambers. This controller corrects provisional assignments to ensure that the drive waveforms match the allocated waveforms, preventing transitions that cause drop placement errors.

Benefits of technology

The solution effectively reduces drop placement errors by ensuring consistent drive waveform polarity across consecutive pixel lines, thereby maintaining high-quality and high-frequency droplet ejections.

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Abstract

The invention relates to methods an apparatuses for droplet deposition, and specifically to methods or apparatuses for correcting errors which can occur. The method includes provisionally assigning fluid chambers 10 as firing or non-firing chambers and provisionally assigning waveforms to electrodes associated with the chambers to selectively induce droplet depositions in desired locations. An allocation of waveforms is also made, based on consistent rules for allocating waveforms to electrodes. Where a conflict is seen between the provisional assignment and the allocation, a correction is applied.
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