Fluid Ejection Die Chamber Layout for Thermal Gradient Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fluidic dies experience heat gradients that lead to inconsistent fluid ejection and print quality defects due to thermal resistive actuators, causing variations in aerodynamic properties and particle settling, resulting in uneven printing on media.
Innovation Solution
A fluid ejection die with a layout of fluid ejection chambers alternatively arranged on higher- and lower-temperature sides, combined with a system of fluid channels and slots for cooling and fluid circulation, which includes a v-shaped arrangement of dividers and pillars to manage temperature gradients and nozzle density for high optical resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If thermal resistive actuators are used to eject fluid, then fluid ejection is achieved, but heat gradients build up causing inconsistent ejection and print quality defects
Solution Approach 1:
The fluid ejection die is divided into multiple independent fluid ejection chambers (first, second, third, fourth chambers) with separate actuators. This segmentation allows different temperature zones to be managed independently, reducing the impact of heat gradients on overall ejection consistency.
Solution Approach 2:
The patent implements a non-uniform layout of fluid ejection chambers where chambers are positioned at different locations (first through fourth chambers) to account for local temperature variations. Each chamber is strategically placed to balance thermal effects, with some chambers experiencing higher temperatures and others lower temperatures, thereby compensating for heat gradient effects.
2Manufacturing precision
If fluid ejection chambers are densely arranged, then optical resolution is improved, but temperature variations cause sawtooth thermal gradients and print defects
Solution Approach 1:
The fluid ejection chambers are arranged in an asymmetric pattern rather than a uniform grid. The first, second, third, and fourth chambers are positioned at different locations and orientations to break up thermal patterns. This asymmetric arrangement prevents the formation of regular sawtooth thermal gradients that would occur with uniform spacing, while maintaining high nozzle density for optical resolution.
3Temperature
If fluid channels are added for cooling, then temperature gradients are reduced, but device complexity increases
Solution Approach 1:
The fluid channels serve multiple functions: they transport fluid to the ejection chambers and simultaneously act as cooling pathways to manage temperature gradients. This multi-functionality reduces the need for separate cooling systems, thereby limiting the increase in device complexity while achieving temperature gradient reduction.
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 temperature gradients and print quality defects, ensuring consistent fluid ejection and high optical resolution printing by actively managing heat distribution and fluid flow within the fluidic die.
Implementation Method 1
heat within the fluidic die may build up and cause the fluids to eject from the die in unexpected ways
Implementation Method 2
a number of channels may be formed on the back side of the fluidic die behind a number of fluid ejection chambers and nozzles to reduce pressure losses within the fluidic die, and to assist in cooling the fluidic die by circulating cool fluid past the thermal resistive actuators
Data Source
AI summary
A fluid ejection die may include a number of fluid ejection chambers laid to correlate with a number of dividers formed in a fluid channel layer such that adjacent fluid ejection chambers are alternatively arranged on a relatively higher-temperature side of the fluid ejection die and a relatively lower-temperature side of the fluid ejection die.