Flow-Through Printhead Manifold Integration for Consistent Jetting
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Solution Overview
Problem
Nozzle failures in printheads due to drying or sedimentation of print fluid within jetting channels result in poor print quality, and existing printheads require multiple laminates, increasing manufacturing costs.
Innovation Solution
A flow-through printhead design with jetting channels arranged in adjacent rows, featuring manifolds on opposite sides of each row to circulate print fluid, reducing sedimentation and drying, and allowing for fewer laminates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If print fluid is circulated through jetting channels, then jetting consistency and performance are improved, but device complexity increases
Solution Approach 1:
The patent combines the supply manifold and return manifold into a single integrated manifold structure that serves both functions. The manifold is configured with a supply portion and a return portion that share common structural elements, reducing the overall number of separate components while maintaining the flow-through circulation function.
Solution Approach 2:
The manifold is designed to perform multiple functions simultaneously: it serves as both the supply manifold for delivering print fluid to jetting channels and the return manifold for collecting spent fluid. The intermediate region between jetting channel rows is utilized to house both supply and return pathways within the same structural element.
2Ease of manufacture
If fewer laminates are used in printhead construction, then manufacturing costs are reduced, but manufacturing precision may be affected
Solution Approach 1:
The patent merges multiple functional layers into fewer laminate structures. Specifically, the supply manifold and return manifold are integrated into a single laminate layer, and the intermediate region is utilized efficiently to accommodate both supply and return pathways without requiring additional separate layers for each function.
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
Improves jetting consistency and performance by preventing print fluid degradation, while reducing manufacturing costs and enabling higher-frequency jetting.
Implementation Method 1
a diaphragm that vibrates in response to an actuator, such as a piezoelectric actuator. A printhead also includes a driver circuit that controls when each individual jetting channel fires based on image or print data. To jet from a jetting channel, the driver circuit provides one or more jetting pulses to the actuator, which cause the actuator to deform a wall of the pressure chamber (i.e., the diaphragm).
Data Source
AI summary
Printheads that jet print fluids. In an embodiment, a flow-through printhead comprises a plurality of jetting channels arranged in a first row and a second row generally in parallel along a length of the printhead, where each of the jetting channels includes a diaphragm, a pressure chamber, and a nozzle configured to jet a print fluid. The flow-through printhead further comprises a first manifold fluidly coupled to the jetting channels in the first row, and a second manifold fluidly coupled to the jetting channels in the first row. The first manifold and the second manifold are disposed on opposite sides of the first row with the second manifold disposed in an intermediate region between the first row and the second row.