Polymeric Filter Membrane for Printhead Nozzle Blockage
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Solution Overview
Problem
Particulate contamination in printheads leads to nozzle blockages, affecting the quality and reliability of inkjet printing systems, especially in continuous printing systems where all nozzles must function simultaneously for high-quality image production.
Innovation Solution
A method of manufacturing a printhead with a filter membrane structure integrated into the substrate, where pores are formed using photo-lithography to filter particulates from the liquid, reducing contamination and pressure loss across the filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filters are positioned in the fluid path to reduce particulate contamination, then nozzle blockage is reduced, but pressure loss across the filter increases
Solution Approach 1:
The patent employs a porous polymeric filter material with controlled pore sizes to filter particulates from the liquid stream. The porous structure allows liquid to pass through while trapping particles, achieving filtration without excessive pressure loss. The pore size is optimized to balance filtration effectiveness with flow resistance.
Solution Approach 2:
The filter is constructed from polymeric materials that combine filtration capabilities with flow-friendly properties. The composite nature of the porous polymer structure provides both particle trapping and acceptable pressure characteristics, resolving the contradiction between filtration effectiveness and pressure loss.
2Manufacturing precision
If the filter membrane structure is integrated into the substrate using photo-lithography, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The filter membrane structure is integrated directly into the substrate during the same photo-lithography process used to form the nozzle plate features. This merging of filter formation with the existing manufacturing process achieves high precision alignment without adding separate fabrication steps, thus improving precision while minimizing added complexity.
Solution Approach 2:
The patent replaces mechanical assembly of separate filter components with a photo-lithographic patterning process. This substitution achieves precise filter positioning and integration through chemical/photochemical means rather than mechanical assembly, improving precision while streamlining the overall manufacturing process.
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 integrated filter membrane structure effectively reduces particulate contamination, enhancing printhead reliability and maintaining high-quality printing by ensuring all nozzles function properly during single-pass printing operations.
Implementation Method 1
The filter membrane structure is adhered, for example, laminated, to the second portion of the substrate. Each liquid chamber of the plurality of liquid chambers is in fluid communication with a distinct portion of the filter membrane structure. Pores are formed in the filter membrane structure using a photo-lithography process.
Implementation Method 2
Pores are formed in the filter membrane structure using a photo-lithography process.
Data Source
AI summary
A method of manufacturing a printhead includes providing a substrate and a filter membrane structure. A first portion of the substrate defines a plurality of nozzles and a second portion of the substrate defines a plurality of liquid chambers. Each liquid chamber of the plurality of liquid chambers is in fluid communication with a respective one of the plurality of nozzles. The filter membrane structure is adhered, for example, laminated, to the second portion of the substrate. Each liquid chamber of the plurality of liquid chambers is in fluid communication with a distinct portion of the filter membrane structure. Pores are formed in the filter membrane structure using a photo-lithography process.