Inkjet Printhead Nozzle Control for Dynamic Pixel Density
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Solution Overview
Problem
Inkjet printing systems face challenges in dynamically altering the spatial density of receiver pixels during printing, particularly in the direction perpendicular to the paper path, which affects image quality, productivity, and document security, as existing methods are costly, complex, and difficult to implement.
Innovation Solution
A method and apparatus that allow for the reconfiguration of the spatial density of receiver pixels during printing by deactivating selected nozzles and using finely tailored drop steering to adjust the pixel grid, enabling slight alterations in the spatial density without significant hardware changes, thus improving image quality, productivity, and document security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing methods are used to dynamically alter the spatial density of receiver pixels during printing, then image quality and document security are improved, but system complexity and cost increase significantly
Solution Approach 1:
The patent applies parameter changes by modifying the spatial density of receiver pixels through software control of nozzle activation patterns rather than hardware reconfiguration. The system dynamically adjusts the effective pixel density by selectively activating or deactivating nozzles in the inkjet array, allowing the same physical hardware to produce different spatial densities (e.g., 300 dpi, 600 dpi, 1200 dpi) without physical changes to the printhead structure.
Solution Approach 2:
The patent implements universality by designing a single inkjet printing system that can perform multiple printing functions at different spatial densities using the same hardware components. The control system enables the printhead to serve multiple purposes: high-resolution printing, low-resolution printing, and intermediate resolutions, all without requiring separate hardware configurations for each density level.
2Reliability
If existing methods are used to dynamically alter the spatial density of receiver pixels during printing, then document security is improved, but data transmission requirements increase
Solution Approach 1:
The patent uses parameter changes to embed security features by subtly modifying the spatial density parameters of printed patterns. Instead of transmitting large amounts of additional data, the system encodes security information through controlled variations in pixel density that are imperceptible to human observers but detectable by machine readers, thereby reducing data transmission requirements while enhancing security.
3Manufacturing precision
If the spatial density of receiver pixels is altered during printing, then image quality is improved, but productivity may be affected
Solution Approach 1:
The patent applies dynamics by enabling real-time adjustment of spatial density parameters during the printing process. The system can dynamically switch between different pixel density levels based on the specific printing requirements of different document sections, allowing high-resolution printing where needed while maintaining faster printing speeds in areas where lower resolution is sufficient, thus balancing image quality and productivity.
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 approach enhances the reliability and security of printed documents by allowing subtle marking for machine identification and preventing unauthorized copying, while minimizing system data transmission requirements and maintaining high image quality.
Implementation Method 1
A heater, located at or near the nozzle, heats the ink sufficiently to boil, forming a vapor bubble that creates enough internal pressure to eject an ink drop
Implementation Method 2
heats the ink sufficiently to boil, forming a vapor bubble that creates enough internal pressure
Implementation Method 3
The stream of ink is perturbed using a drop forming mechanism such that the liquid jet breaks up into drops of ink in a predictable manner
Implementation Method 4
Various approaches for selectively deflecting drops have been developed including electrostatic deflection
Implementation Method 5
A heater, located at or near the nozzle, heats the ink sufficiently to boil, forming a vapor bubble that creates enough internal pressure to eject an ink drop
Data Source
AI summary
A method of printing includes providing a printhead including a jet control element including a continuous heater element positioned to surround a nozzle. A plurality of three or more electrical contacts is in electrical communication with the continuous heater element. The plurality of three or more electrical contacts define a plurality of three or more continuous heater element portions that are actuatable with sufficient independence so as to control jet steering. The number of the continuous heater element portions equals the number of electrical contacts. A liquid is provided under a pressure sufficient to eject a jet of liquid through the nozzle. A waveform is applied to at least one of the plurality of three or more electrical contacts using a controller to affect at least one of the plurality of independently actuatable continuous heater element portions to control the jet of liquid.