Inkjet Printhead Nozzle Array Transverse Pitch Design
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Solution Overview
Problem
Current inkjet printheads face challenges in achieving high print resolution while maintaining a compact design, as the spacing of nozzles over a large section of the paper path requires complex media control and reduces print speeds, and increasing nozzle density is necessary to improve resolution without expanding the printhead's width.
Innovation Solution
The printhead design features an array of nozzles with actuators having electrodes of opposing polarities, offset to reduce resistive losses, and a print engine controller that can selectively reduce print resolution by apportioning data between adjacent nozzles, along with a refill system ensuring uniform ink flow rates across the array, allowing for a high nozzle density and efficient drop ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If nozzle density is increased to improve print resolution, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent transitions from increasing nozzle density in the media feed direction to arranging nozzles in multiple rows transverse to the media feed direction. This dimensional shift allows high print resolution to be achieved through increased nozzle pitch (fewer nozzles per inch transverse to media feed) rather than higher nozzle density along the media path, thereby reducing device complexity while maintaining manufacturing precision.
2Manufacturing precision
If nozzles are spaced over a large section of the paper path to achieve high resolution, then manufacturing precision is improved, but the length of the printhead increases
Solution Approach 1:
The patent resolves this contradiction by arranging nozzles in multiple rows transverse to the media feed direction rather than spacing them linearly along the media path. This allows the printhead to achieve high print resolution with a compact width by utilizing the transverse dimension for nozzle arrangement, thereby reducing the length of the moving object while maintaining manufacturing precision.
3Manufacturing precision
If nozzle density is increased to improve print resolution, then manufacturing precision is improved, but media control complexity increases
Solution Approach 1:
The patent reduces media control complexity by changing the nozzle arrangement from high-density spacing along the media feed direction to multiple rows transverse to the media feed direction. This dimensional change allows the printhead to maintain high print resolution while requiring less precise media positioning and control, as the nozzles are distributed across a wider transverse area rather than concentrated along the media path.
4Device complexity
If nozzle pitch is increased transverse to media feed direction, then device complexity is reduced, but print resolution may be compromised
Solution Approach 1:
The patent segments the nozzle array into multiple rows transverse to the media feed direction, with each row containing nozzles spaced at a relaxed pitch. By distributing nozzles across multiple segmented rows rather than using a single high-density line, the system achieves high print resolution through increased transverse coverage while maintaining lower individual nozzle pitch requirements, thereby reducing device 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 configuration achieves a high nozzle pitch and print resolution, extending the operational life of nozzles and enabling increased print speeds while maintaining a compact design, with the ability to adjust resolution for varying print jobs.
Implementation Method 1
each actuator having electrodes spaced from each other in a direction transverse to the rows; and drive circuitry for transmitting electrical power to the electrodes
Implementation Method 2
the electrodes of the actuators in adjacent rows have opposing polarities such that the actuators in adjacent rows have opposing current flow directions
Data Source
AI summary
An inkjet printhead with an array of nozzles for ejecting drops of printing fluid onto print media. The print media moves in a print direction relative to the printhead and the nozzles in the array are spaced apart from each other by less than 10 microns in the direction perpendicular to the print direction. With nozzles spaced less than 10 microns apart in the direction perpendicular to the print direction, the printhead has a very high ‘true’ print resolution—i.e. the high number of dots per inch is achieved by a high number of nozzles per inch.