Nozzle Selection for Inkjet Discharge Stability
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Solution Overview
Problem
Inkjet printing apparatuses face challenges in accurately detecting and stabilizing the discharge state of ink droplets, leading to image degradation and poor image quality due to variations in discharge speed and flying stability, which existing methods fail to address effectively.
Innovation Solution
A printing apparatus and method that select a predetermined number of nozzles for discharge monitoring, excluding any with discharge abnormalities to ensure accurate detection and stabilization of ink droplet flight, using a combination of sensors and control units to monitor and adjust discharge speed and timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If discharge speed measurement is implemented, then registration accuracy is improved, but detection precision of unstable flying state deteriorates
Solution Approach 1:
The patent divides the nozzle group into multiple sub-groups and selects specific nozzles from each sub-group for discharge state detection. This segmentation allows the system to avoid nozzles with discharge abnormalities by selecting only those nozzles that meet predetermined criteria, thereby improving both measurement accuracy and detection reliability simultaneously
Solution Approach 2:
The system performs discharge state detection using selected nozzles and feeds back the detection results to adjust printing conditions. This feedback mechanism enables continuous optimization of discharge speed measurement and unstable flying state detection, resolving the contradiction by using reliable detection data to improve overall measurement precision
2Area of stationary object
If all nozzles are used for discharge monitoring, then detection coverage is improved, but detection accuracy deteriorates due to inclusion of abnormal nozzles
Solution Approach 1:
The patent extracts and excludes nozzles with discharge abnormalities from the monitoring group by selecting nozzles based on predetermined conditions. This extraction of problematic elements ensures that only healthy nozzles contribute to discharge state detection, maintaining high detection accuracy while still covering sufficient area through strategic selection of multiple nozzles
Data Source
AI summary
A printing apparatus includes a selection unit configured to select a predetermined number of nozzles from nozzles of a printhead including a plurality of nozzles configured to discharge a liquid droplet; and a detection unit configured to detect a discharge state of a liquid droplet by using the predetermined number of nozzles being selected. The selection unit selects the predetermined number of nozzles such that a nozzle having a discharge abnormality is not included in the predetermined number of nozzles.