Inkjet Nozzle Compensation via Drive Frequency Control
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Solution Overview
Problem
Existing inkjet printing methods fail to maintain stable ejection operations in nozzle arrays during ejection failure compensation, leading to unstable performance due to insufficient consideration of nozzle drive states and crosstalk effects.
Innovation Solution
An inkjet printing apparatus and method that includes a generation unit for print data, an acquisition unit for defective nozzle information, and a compensating unit that selects a non-defective nozzle to compensate for ejection failures by ensuring the compensating nozzle does not eject ink to specific pixel areas, thereby maintaining stable ejection operations and minimizing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compensating nozzle is selected without considering the drive state, then ejection failure compensation is achieved, but ejection operation stability deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically selecting compensating nozzles based on drive frequency parameters. The control unit evaluates the drive frequency of each nozzle and selects compensating nozzles that maintain stable operating parameters, avoiding nozzles that would exceed optimal drive frequency ranges. This ensures compensation while maintaining ejection stability.
Solution Approach 2:
The patent implements feedback by continuously monitoring the drive state of nozzles and using this information to select appropriate compensating nozzles. The control unit receives feedback on nozzle drive frequencies and adjusts compensating nozzle selection accordingly, ensuring that compensating nozzles operate within stable parameter ranges.
2Productivity
If nozzle drive frequency increases to compensate for failures, then printing speed is maintained, but refill time becomes insufficient
Solution Approach 1:
The patent uses parameter changes by selecting compensating nozzles based on their drive frequency characteristics. The control unit identifies nozzles with drive frequencies that allow sufficient refill time while maintaining overall printing productivity. This involves changing the selection criteria to prioritize nozzles with appropriate refill characteristics.
Solution Approach 2:
The patent applies dynamics by dynamically adjusting compensating nozzle selection based on real-time drive state monitoring. The system adapts compensating nozzle assignment to current operating conditions, selecting nozzles that can maintain stable operation with adequate refill time while contributing to overall printing speed.
3Productivity
If adjacent nozzles eject ink simultaneously to maintain speed, then productivity is improved, but crosstalk increases
Solution Approach 1:
The patent applies parameter changes by evaluating the spatial and temporal parameters of nozzle ejection operations. The control unit selects compensating nozzles that minimize crosstalk by considering the positions and drive timing of adjacent nozzles, choosing nozzles whose operation parameters reduce harmful interactions while maintaining printing speed.
Solution Approach 2:
The patent uses an intermediary approach by introducing a selection criterion that acts as a mediator between productivity requirements and crosstalk reduction. The control unit applies intermediate selection rules that balance simultaneous ejection benefits with crosstalk mitigation, choosing compensating nozzles that satisfy both competing requirements.
Data Source
AI summary
An inkjet printing apparatus uses a printing head including a plurality of nozzle arrays each including a plurality of nozzles arrayed in a first direction, the nozzle arrays being arranged in a second direction. A compensating unit compensates for an ejection failure of a defective nozzle by causing a compensating nozzle to eject ink to a predetermined pixel area in a case where the print data corresponding to the defective nozzle indicates ink ejection to the predetermined pixel area. The compensating unit determines the compensating nozzle such that the compensating nozzle satisfies both a first condition that the compensating nozzle is not a defective nozzle and a second condition that the print data indicates that nozzles belonging to the nozzle array including the compensating nozzle do not eject ink to a pixel area corresponding to N pixels (N is a positive integer) around the predetermined pixel area in the first direction.