Inkjet Printhead Nozzle Discharge Status Detection
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Solution Overview
Problem
Conventional inkjet printing methods struggle to accurately judge the ink discharge status of nozzles, leading to inappropriate recovery processing and image failures such as stripes, as they cannot differentiate between normal and discharge failure statuses effectively.
Innovation Solution
A printing apparatus and control method that utilize a printhead with energy generating elements and detection elements, where the ink discharge status is judged by changing the threshold for a target nozzle based on signal output, calculating a difference value from adjacent nozzles' statistics, and comparing it with predetermined thresholds to accurately determine the discharge status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional binary threshold judgment is used to differentiate normal discharge and non-discharge statuses, then the judgment process is simple and quick, but the discharge status cannot be accurately distinguished in all situations leading to inappropriate recovery processing
Solution Approach 1:
The patent applies parameter changes by introducing a difference value parameter (Ddiff) that represents the deviation of each nozzle's temperature change signal from the average of adjacent nozzles. This additional parameter enables differentiation between normal discharge, discharge failure, and non-discharge statuses that cannot be distinguished using only the binary normal/non-discharge classification, thereby improving measurement precision without requiring complex additional hardware
Solution Approach 2:
The patent uses the average temperature change signal of adjacent nozzles as an intermediary reference to evaluate the discharge status of a target nozzle. This intermediary approach allows the system to identify abnormal nozzles by comparing them against their neighbors, improving judgment accuracy while maintaining a relatively simple evaluation process that builds upon the conventional binary judgment framework
2Reliability
If recovery processing is executed based on inaccurate discharge status judgment, then the processing can be executed quickly, but image failures such as stripes occur due to inappropriate timing
Solution Approach 1:
The patent introduces a difference value parameter (Ddiff) that quantifies the deviation of each nozzle's temperature change signal from the average of adjacent nozzles. By comparing Ddiff against thresholds, the system can accurately identify nozzles in non-discharge status and execute recovery processing at appropriate timing, preventing image failures while optimizing the balance between reliability and time loss
Solution Approach 2:
The patent implements feedback by continuously monitoring the temperature change signals of nozzles and comparing them against reference values derived from adjacent nozzles. This feedback mechanism enables real-time detection of discharge status changes and triggers recovery processing only when necessary, improving image quality while avoiding unnecessary processing delays
3Adaptability or versatility
If only binary classification (normal discharge vs non-discharge) is used, then the judgment method is simple, but it cannot identify intermediate discharge failure status requiring different recovery operations
Solution Approach 1:
The patent enhances classification capability by introducing the difference value parameter (Ddiff) that measures the deviation of each nozzle's temperature change signal from the average of adjacent nozzles. This single additional parameter enables three-way classification (normal discharge, discharge failure, non-discharge) without requiring complex multi-dimensional analysis or additional sensors, thus improving adaptability while keeping the system relatively simple
Solution Approach 2:
The patent segments the discharge status classification into distinct categories based on the difference value (Ddiff) thresholds. By dividing the continuous range of Ddiff values into discrete classification zones, the system achieves versatile status identification with a straightforward computational approach, avoiding the need for complex classification algorithms
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 allows for precise discrimination of each nozzle's discharge status, enabling timely and appropriate recovery processing, thus preventing image failures and ensuring high-quality prints.
Implementation Method 1
an electrothermal transducer that generates heat in accordance with energization
Implementation Method 2
a temperature detection element is provided immediately below a print element that generates thermal energy for ink discharge
Data Source
AI summary
A method for inspecting an ink discharge status based on a temperature change of an energy generating element includes calculating a difference value between a value obtained by statistics of information indicating ink discharge statuses obtained for a plurality of nozzles close to a target nozzle and the information obtained for the target nozzle; comparing the calculated difference value with a predetermined threshold; and judging the ink discharge status for the target nozzle based on a result of the comparison. This enables to appropriately detect a nozzle which is in a discharge failure status due to an ink droplet adhered to a discharge surface of a printhead or the like.