Inkjet Printhead Module Segmentation for Peak Power Stabilization
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Solution Overview
Problem
Pagewidth inkjet printheads face challenges in managing fluctuating peak power requirements, which complicates the design and operation of the power supply, and existing redundancy schemes to address dead or malfunctioning nozzles increase power demands and are difficult to implement effectively.
Innovation Solution
The method involves configuring nozzles in sets with redundant pairs to share the printing load, allowing each nozzle to print dots on the same position, thereby modulating the peak power requirement and reducing fluctuations, while also improving print quality by averaging the impact of dead or malfunctioning nozzles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing redundancy schemes are implemented to address dead or malfunctioning nozzles, then nozzle reliability is improved, but peak power requirements increase and device complexity increases
Solution Approach 1:
The printhead is divided into multiple independently controllable printhead modules, each with its own nozzles. This segmentation allows the system to activate only the modules needed for current printing tasks, reducing peak power consumption while maintaining reliability through selective redundancy deployment.
Solution Approach 2:
The system dynamically adjusts which nozzles and printhead modules are activated based on real-time printing requirements and nozzle health status. This dynamic activation strategy ensures that redundant nozzles are used selectively to compensate for dead nozzles without continuously operating all nozzles at full power, thereby managing peak power requirements.
2Reliability
If existing redundancy schemes are implemented to address dead or malfunctioning nozzles, then nozzle reliability is improved, but device complexity increases
Solution Approach 1:
The printhead is divided into multiple independently controllable printhead modules, each with its own nozzles. This segmentation allows the system to activate only the modules needed for current printing tasks, reducing peak power consumption while maintaining reliability through selective redundancy deployment.
Solution Approach 2:
The system changes operational parameters by dynamically adjusting which printhead modules and nozzles are activated based on printing requirements and nozzle health. This parameter-based control simplifies the implementation of redundancy by using software-controlled activation rather than complex hardware switching mechanisms.
3Productivity
If all nozzles fire simultaneously to maximize printing speed, then productivity is improved, but peak power requirement increases
Solution Approach 1:
Instead of all nozzles firing simultaneously, the system employs periodic or staggered firing sequences across different printhead modules. This approach maintains high printing speed by ensuring continuous ink deposition while distributing power consumption over time, thereby reducing peak power requirements.
Solution Approach 2:
The printhead is divided into multiple independently controllable printhead modules, each with its own nozzles. This segmentation allows the system to activate only the modules needed for current printing tasks, reducing peak power consumption while maintaining reliability through selective redundancy deployment.
Data Source
AI summary
An inkjet printhead comprising a plurality of transversely aligned color channels is provided. Each color channel comprises at least one nozzle row extending longitudinally along said printhead. Each nozzle in a row ejects the same colored ink. The printhead is comprised of a plurality of printhead modules, and the number of color channels is equal to the number of printhead modules.