Printhead Nozzle Layouts for Inkjet Printing
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Solution Overview
Problem
Inkjet technology faces issues with non-ideal droplet ejection, resulting in airborne droplets not depositing at the desired location, affecting printing quality, especially for graphics, due to the use of circular and non-circular nozzles which produce visible printing defects in images and filled areas.
Innovation Solution
Implementing a printhead with a combination of drop ejectors having circular and non-circular nozzles, where circular nozzles are used for graphic elements and non-circular nozzles for textual and line elements, with the print processing function generating firing data to selectively activate these nozzles based on the image data to optimize droplet placement and reduce defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If circular nozzles are used for all elements, then text and lines are printed, but visible printing defects appear in graphics and filled areas
Solution Approach 1:
The printhead is segmented into two distinct types of nozzles: circular nozzles and non-circular nozzles. Each nozzle type is specialized for different printing tasks - circular nozzles for graphics and filled areas, non-circular nozzles for text and line elements. This segmentation allows each nozzle type to optimize its performance for its specific function, eliminating the visible printing defects that occur when a single nozzle type is used for all elements.
Solution Approach 2:
Different nozzle geometries are assigned to different spatial locations within the printhead array. The printhead contains both circular nozzles and non-circular nozzles distributed across its length, allowing local optimization of droplet ejection characteristics based on the specific printing requirements of different regions of the print media.
2Device complexity
If a single nozzle type is used, then device complexity is reduced, but printing quality deteriorates for different element types
Solution Approach 1:
Rather than using a single nozzle type for all elements, the system segments the nozzle population into two distinct types with different geometries. This segmentation increases device complexity slightly but dramatically improves printing quality by allowing each nozzle type to be optimized for its specific function - circular nozzles for graphics and non-circular nozzles for text and lines.
Solution Approach 2:
The system dynamically selects which nozzle type to use based on the element type being printed. The print processing function analyzes the image data and selectively activates appropriate nozzles (circular or non-circular) depending on whether the current element is a graphic, text, or line element, thereby adapting the nozzle configuration to the printing requirements.
3Manufacturing precision
If non-circular nozzles are used for all elements, then text and lines are printed crisply, but graphics and filled areas show visible defects
Solution Approach 1:
The printhead is configured with different nozzle geometries in different locations, with non-circular nozzles optimized for text and line elements, and circular nozzles optimized for graphics and filled areas. This local quality differentiation ensures that each element type is printed by the most suitable nozzle geometry, preventing visible defects in graphics while maintaining crisp text and lines.
Solution Approach 2:
The print processing function dynamically determines which nozzle type to activate based on the element type in the image data. When text or line elements are detected, non-circular nozzles are selectively activated; when graphic or filled area elements are detected, circular nozzles are activated. This dynamic selection eliminates visible defects in graphics while preserving the crisp quality of text and lines.
Data Source
AI summary
Nozzle layouts for printheads are described. In an example, a printhead includes a first set of drop ejectors having orifices with circular bores, and a second set of drop ejectors having orifices with non-circular bores. A processor receives printing data representing an image to be printed to media, and provides firing data to the printhead for activating the drop ejectors. The firing data selects the drop ejectors with the circular bores to print graphic elements of the image and selecting the drop ejectors with the non-circular bores to print textual elements or line elements of the image.