Inkjet Printhead Nozzle Rim Irregularity for Drop Misdirection Control
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Solution Overview
Problem
Inkjet printing faces challenges in controlling drop trajectory, leading to misdirection issues that negatively impact print quality due to inherent nozzle design limitations.
Innovation Solution
The design incorporates an array of ink chambers with nozzles featuring localized irregularities on the nozzle rim and elongate shapes aligned with thermal actuators, allowing for controlled misdirection of ink drops to minimize overall misdirection across the printhead array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional nozzles with smooth rims are used, then manufacturing is simpler, but drop trajectory control deteriorates due to misdirection
Solution Approach 1:
The nozzle rim is designed with a localized irregularity (such as a protrusion or asymmetric feature) at a specific position rather than uniform modifications throughout. This local modification creates controlled misdirection that compensates for inherent nozzle alignment errors, improving drop trajectory control without requiring complete redesign of the entire nozzle structure.
Solution Approach 2:
The nozzle aperture or rim is designed with asymmetric features that intentionally create unequal flow paths or pressure distributions. This asymmetry generates controlled misdirection of the ink drop, allowing compensation for systematic alignment errors in the nozzle array and improving overall print quality.
2Manufacturing precision
If nozzle alignment is made more precise, then drop misdirection is reduced, but manufacturing complexity and cost increase
Solution Approach 1:
The nozzle rim irregularity is pre-formed during nozzle manufacturing to anticipate and compensate for alignment errors. This preliminary geometric modification allows the system to achieve better drop placement accuracy without requiring post-manufacturing alignment adjustments or more complex assembly processes.
Solution Approach 2:
The geometric parameters of the nozzle rim (such as protrusion height, position, or shape) are optimized to compensate for typical alignment variations. By adjusting these parameters, the system achieves improved drop trajectory control while maintaining manufacturing feasibility within standard tolerances.
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 effectively minimizes drop misdirection, enhancing print quality by intentionally directing ink drops to compensate for inherent nozzle misalignment, resulting in improved print resolution and efficiency.
Implementation Method 1
forming gas or vapor bubbles in a bubble forming liquid
Implementation Method 2
an actuator for ejecting ink through the nozzle
Data Source
AI summary
An inkjet printhead comprising: an array of ink chambers, each having a nozzle and an actuator for ejecting ink through the nozzle; wherein, the nozzle has a nozzle rim defining a nozzle aperture and a localized irregularity on the nozzle rim extending toward the center of the nozzle aperture.