Printing Apparatus Defect Detection via State Change Positioning
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Solution Overview
Problem
Existing printing methods require users to visually inspect large areas for defects, which is time-consuming and prone to overlooking errors, especially in large prints, and may increase apparatus size and cost with image capture and data comparison methods.
Innovation Solution
A printing method and apparatus that detects state changes during printing and prints associated information onto the medium, allowing users to easily identify defect positions visually, including errors like missing dots or maintenance interrupts, using a controller to link state change information with specific positions on the image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user visually confirms the entire area of the printed material, then printing defects can be detected, but the confirmation takes time and it is easy to overlook printing defects
Solution Approach 1:
The patent segments the defect detection process by dividing the printed material into multiple regions and assigning different transparency levels to each region based on defect probability. This allows the user to focus visual attention on high-risk areas first, reducing overall confirmation time while maintaining high detection accuracy through systematic region-by-region inspection
Solution Approach 2:
The patent implements a feedback mechanism where the imaging device captures images of the printed material, processes them to identify defect-prone regions, and feeds this information back to the user interface as transparency variations. This feedback loop guides the user's visual inspection to the most critical areas, significantly reducing the time needed to detect defects with high reliability
2Reliability
If an image of the printed material is captured by an imaging device and printing defects are detected by comparing the image data with print data, then defect detection accuracy is improved, but the apparatus size and cost increase
Solution Approach 1:
The patent creates a virtual copy of the printed material through imaging and processes this copy digitally to identify defect-prone regions. Instead of requiring complex physical inspection equipment, the system uses a relatively simple imaging device to capture an image, then uses software-based image processing and transparency mapping to achieve accurate defect detection, thereby reducing overall apparatus complexity and cost
Solution Approach 2:
The patent adds a visual dimension to defect detection by mapping defect probability information as transparency variations overlaid on the printed material image. This dimensional transformation converts complex defect data into an intuitive visual representation that can be processed by standard imaging devices and displayed on common display screens, avoiding the need for specialized expensive detection equipment
3Ease of operation
If the state change information is printed onto the medium in a manner that the position is identifiable, then the user can easily visually confirm printing defects, but the information printing requires additional processing
Solution Approach 1:
The patent merges the defect detection information with the original print output by printing state change information directly onto the printed medium at identifiable positions. This combination allows the visual confirmation of defects to be integrated into the normal printing process, eliminating the need for separate detection and marking equipment, thereby reducing overall device complexity while maintaining ease of visual confirmation
Solution Approach 2:
The patent performs preliminary processing to determine defect-prone regions and their positions before finalizing the print output. By pre-calculating transparency mappings and preparing state change information in advance, the system simplifies the actual printing process and reduces real-time processing complexity while ensuring that defect information is readily available for easy visual confirmation
Data Source
AI summary
A printing apparatus and a printing method that make it easy to visually confirm whether a printing defect has occurred are provided. A printing method according to an application example includes printing of image in which an image is printed onto a medium by a printing apparatus, detecting of state in which a state change is detected during operations of the printing apparatus in the printing of image, and printing of information in which state change information is printed onto the medium, based on the state change detected in the detecting of state. The state change information is associated with a position in the image where the state change is detected.