Pulse Damped Fluidic Architecture for Inkjet Printheads
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Solution Overview
Problem
Inkjet printers face issues with nozzle clogging, depriming, flooding, and color mixing due to sharp pressure pulses and varying operational conditions, which existing designs struggle to prevent or address effectively.
Innovation Solution
The integration of a pulse damper with a moveable interface contacting ink and a compressible fluid, positioned proximate to the printhead, along with a peristaltic pump mechanism and a pressure regulator, helps dampen pressure spikes and facilitate ink distribution, purging, and maintenance, while a filter and shutoff valves manage contaminants and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high nozzle density and high print speeds are implemented using MEMS printhead ICs, then productivity and manufacturing precision are improved, but the risk of nozzle clogging, depriming, and flooding increases due to sharp pressure pulses
Solution Approach 1:
A pulse damper is positioned in the ink supply line upstream of the printhead to absorb and dampen pressure pulses before they reach the nozzle array. This cushioning effect prevents sharp pressure spikes that would otherwise cause flooding or depriming of the nozzles, thereby maintaining reliable operation at high print speeds.
Solution Approach 2:
The pulse damper acts as an intermediary component between the ink supply system and the MEMS printhead. It mediates the pressure fluctuations by providing a compliant element that absorbs excess pressure energy, protecting the sensitive nozzle structures from harmful pressure variations while allowing continuous high-speed operation.
2Reliability
If a pulse damper is added to dampen pressure pulses and prevent flooding, then nozzle reliability is improved, but device complexity increases
Solution Approach 1:
The pulse damper utilizes a flexible membrane or elastomeric element that expands and contracts to absorb pressure pulses. This flexible component provides effective pulse damping without requiring complex mechanical structures, keeping the overall device complexity manageable while significantly improving nozzle reliability.
3Ease of operation
If peristaltic pump mechanism is implemented for ink distribution and purging, then ease of operation and maintenance are improved, but device complexity increases
Solution Approach 1:
The peristaltic pump mechanism enables the printer to perform self-priming and self-purging operations. By using the pump to circulate ink through the system and activate the pulse damper's purging function, the device maintains itself without requiring external intervention, improving ease of operation despite the added mechanical complexity.
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 solution reduces the risk of flooding and depriming, minimizes ink leakage, and effectively manages color mixing, ensuring reliable operation and maintenance of high-speed pagewidth printheads by regulating ink pressure and flow.
Implementation Method 1
the pulse damper is an elastic section of the ink line
Implementation Method 2
Adding a pulse damper to the fluidic architecture accepts that sharp pressure pulses in the ink may occur but by damping them, the pressure amplitude is less capable of flooding or depriming the MEMS printhead
Implementation Method 3
WO99/11933 describes an inkjet printer comprising a peristaltic pump for selectively controlling priming, pumping and purging operations in a multi-channel printer
Data Source
Figure 1~2
Figure 3A~4
Figure 3B
AI summary
An inkjet printer with a printhead integrated circuit (IC) (28), an ink supply reservoir (6) for storing ink, an ink supply line (3) defining a flow path from the ink supply reservoir to the printhead IC (28). A pulse damper (16) positioned along the flow path to decrease the amplitude of pressure pulses in the ink.