Liquid Discharge Head With Overlapping Manifolds
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Solution Overview
Problem
Ink jet recording apparatuses face challenges in minimizing flow channel resistance and preventing air bubbles from entering pressure chambers, which affects ink jet characteristics.
Innovation Solution
A liquid discharge head design with overlapping supply and feedback manifolds, where pressure chambers are arranged on both sides of the supply manifold to reduce flow channel resistance and disperse ink flow, minimizing the likelihood of air bubbles entering pressure chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the supply manifold and feedback manifold are arranged to overlap in the up-down direction, then the device complexity is reduced, but the flow channel resistance increases
Solution Approach 1:
The patent transitions from a planar arrangement to a three-dimensional overlapping structure where the supply manifold and feedback manifold are positioned at different heights (up-down direction). This vertical stacking reduces the horizontal footprint and structural complexity while maintaining adequate flow channels through optimized vertical spacing and connection pathways.
Solution Approach 2:
The feedback manifold is positioned within the vertical space occupied by the supply manifold, creating a nested configuration. The feedback manifold is arranged to be surrounded by or integrated within the spatial envelope of the supply manifold structure, allowing both manifolds to coexist in a compact arrangement with minimized interference.
2Device complexity
If the pressure chambers are arranged on one side of the supply manifold, then the device complexity is reduced, but the flow channel resistance increases and air bubbles are more likely to enter pressure chambers
Solution Approach 1:
The pressure chambers are asymmetrically arranged with different configurations on either side of the supply manifold. The first pressure chambers are positioned at a different location and orientation compared to the second pressure chambers, creating an asymmetric layout that optimizes flow distribution and reduces resistance while maintaining structural efficiency.
Solution Approach 2:
Different regions of the supply manifold are designed with locally optimized characteristics. The supply ports connecting to first pressure chambers are positioned differently from those connecting to second pressure chambers, with each region's flow channel geometry tailored to its specific requirements for minimizing resistance and preventing air bubble intrusion.
3Productivity
If the ink flow quantity is increased to supply sufficient ink, then the productivity is improved, but the air bubbles are more likely to intrude into pressure chambers
Solution Approach 1:
The flow channel design creates equipotential flow conditions by optimizing the geometry and positioning of supply ports and pressure chamber connections. The manifold structure is designed to distribute ink flow uniformly across all pressure chambers, eliminating preferential flow paths that would cause air bubbles to concentrate in specific regions during high-rate ink supply.
Data Source
AI summary
There is provide a liquid discharge head including: a supply manifold; a feedback manifold; and a plurality of individual flow channels having: a supply portion, a descender portion, and a feedback portion. The supply manifold has a plurality of supply ports, and the feedback manifold has a plurality of feedback ports. At least part of the supply manifold overlaps with the feedback manifold in the second direction. The plurality of pressure chambers have first pressure chambers forming a first pressure chamber array and second pressure chambers forming a second pressure chamber array. The first pressure chamber array is arranged at one side, of the supply manifold, in a third direction and the second pressure chamber array is arranged at the other side, of the supply manifold, in the third direction. The first pressure chamber array and the second pressure chamber array are connected to the supply manifold.