Compact Inkjet Nozzle Layout for Fast Refill and Crosstalk Isolation
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Solution Overview
Problem
Existing inkjet nozzle devices struggle to achieve consistent droplet ejection trajectories, high chamber refill rates, and minimal fluidic crosstalk while maintaining a compact MEMS footprint and compatibility with existing CMOS circuitry.
Innovation Solution
The design of an inkjet nozzle device with mirror symmetry about a perpendicular axis, featuring an elongate baffle plate parallel to a bar heater, minimizes inter-row spacing and optimizes chamber geometry for rapid refill and fluid isolation, ensuring compatibility with CMOS circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inter-row spacing between nozzle rows is minimized, then the printing density and efficiency are improved, but the structural integrity of the print chip and separation between color channels deteriorate
Solution Approach 1:
The patent transitions from conventional side-by-side nozzle row arrangements to a stacked configuration where nozzle rows are positioned vertically above each other. This dimensional change allows minimal horizontal spacing between rows while maintaining adequate vertical separation, thus improving printing density without compromising structural integrity or color channel separation.
2Area of stationary object
If the nozzle rows are positioned closer together, then the width of the backside ink supply channel is reduced, but the separation between adjacent color channels is reduced
Solution Approach 1:
By stacking nozzle rows vertically, the patent reduces the horizontal footprint of the ink supply channels while maintaining adequate vertical separation between color channels. This prevents color mixing at the nozzle face while minimizing the width of backside ink supply channels.
3Volume of moving object
If a compact MEMS footprint is achieved, then the inter-row nozzle spacing is minimized, but the chamber refill rate and droplet ejection consistency may deteriorate
Solution Approach 1:
The stacked nozzle row configuration enables a compact MEMS footprint by reducing horizontal spacing while maintaining adequate chamber volumes and fluidic pathways. The vertical stacking preserves chamber refill rates and droplet ejection consistency by maintaining proper fluid dynamics without requiring large horizontal distances.
4Measurement precision
If the nozzle rows are offset for high dpi printing, then the printing resolution is improved, but the distance between odd and even nozzle rows increases
Solution Approach 1:
The patent maintains the offset configuration of odd and even nozzle rows for high dpi printing but positions them in vertically stacked layers rather than horizontally adjacent positions. This reduces the distance between offset rows while preserving the resolution benefits of the offset 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
The solution provides consistent droplet ejection trajectories, high chamber refill rates, and minimizes fluidic crosstalk, while achieving a compact footprint and compatibility with existing CMOS circuitry, thereby enhancing printing efficiency and reducing production costs.
Implementation Method 1
an elongate bar heater for ejection of ink through the nozzle aperture
Implementation Method 2
an elongate bar heater for ejection of ink through the nozzle aperture
Data Source
AI summary
An inkjet nozzle device includes a main chamber having a floor, a roof and a perimeter wall enclosing the main chamber. The main chamber includes: a firing chamber having a nozzle aperture defined in the roof and a bar heater for ejection of ink through the nozzle aperture; an antechamber for supplying ink to the firing chamber, the antechamber having a chamber inlet defined in the floor; and a baffle plate extending parallel with the bar heater, which partitions the main chamber to define the firing chamber and the antechamber. The nozzle device has mirror symmetry about a symmetry plane extending perpendicular to the longitudinal axes of the bar heater and the baffle plate.