Printhead Cross-Talk Reduction via Fluidic Isolation
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Solution Overview
Problem
Fluidic cross-talk between adjacent jetting flow paths in liquid ejection devices can adversely affect droplet ejection performance by causing non-uniformity and inaccuracy in droplet placement, which is a challenge in achieving uniform deposition of liquid droplets on a medium.
Innovation Solution
The configuration of the printhead is optimized by increasing the fluidic travel distance from the piezoelectric actuator of one jetting flow path to the nozzle of an adjacent flow path, ensuring this distance is greater than the speed of sound in the liquid times the break-off time of a droplet, thereby reducing fluidic cross-talk and improving droplet ejection uniformity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the fluidic travel distance between adjacent jetting flow paths is increased, then fluidic cross-talk is reduced and droplet ejection uniformity is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent introduces a thick feed substrate layer (at least 2mm, preferably at least 5mm) as a new dimensional element between adjacent jetting flow paths. This vertical dimension (thickness) provides sufficient fluidic travel distance to reduce cross-talk while maintaining a compact horizontal footprint. The feed substrate acts as a physical barrier that isolates fluidic paths without requiring increased horizontal spacing.
Solution Approach 2:
The feed substrate serves as an intermediary element that mediates between the liquid supply and the jetting flow paths. By positioning fluid inlets within this intermediate layer and ensuring sufficient thickness, the system creates a buffer zone that prevents pressure waves and fluidic disturbances from adjacent paths from directly affecting each other, thereby reducing cross-talk while maintaining manufacturing feasibility.
2Measurement precision
If the fluidic travel distance is increased to reduce cross-talk, then droplet placement accuracy is improved, but the device size and manufacturing complexity increase
Solution Approach 1:
The patent resolves the size contradiction by transitioning from horizontal spacing to vertical thickness. The feed substrate thickness (at least 2mm, preferably at least 5mm) provides the necessary fluidic travel distance in the vertical dimension, allowing compact horizontal arrangement of nozzles while maintaining sufficient isolation between adjacent flow paths for accurate droplet placement.
Solution Approach 2:
The patent applies local quality by concentrating the isolation function specifically in the feed substrate region where fluid inlets are positioned. Rather than increasing the overall device size uniformly, the thick feed substrate locally provides the necessary fluidic travel distance at critical points (between adjacent flow paths) while keeping other regions compact.
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 structural arrangement significantly reduces fluidic cross-talk, leading to more accurate and uniform droplet ejection, resulting in improved image representation during printing.
Implementation Method 1
a piezoelectric actuator associated with each jetting flow path... a driver configured to apply a voltage pulse to the piezoelectric actuator
Implementation Method 2
a fluidic travel distance from the piezoelectric actuator of the first jetting flow path to the nozzle of the second jetting flow path is greater than a speed of sound in the liquid times the break off time
Data Source
Figure 1~2
Figure 3
Figure 4~6
AI summary
A printing device (100) for jetting a liquid includes a flow path body (110) having a plurality of jetting flow paths, a liquid in the plurality of jetting flow paths, a piezoelectric actuator (125) associated with each jetting flow path, a feed substrate (160) having a plurality of fluid inlets (175), and a driver configured to apply a voltage pulse to the piezoelectric actuator (125). The first jetting flow path is adjacent to the second jetting flow path and a fluidic travel distance from the piezoelectric actuator (125) of the first jetting flow path to a nozzle (190) of the second jetting flow path is greater than a speed of sound in the liquid times the break off time of a droplet of the fluid from the nozzle (190).