Inkjet Printer Composite Black Selection for Streaking
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Solution Overview
Problem
Inkjet printers face issues with noticeable streaking in print images due to defective nozzles, as the hue of composite black generated by color ink droplets varies with different printing media, leading to insufficient complementing of missing black ink pixels.
Innovation Solution
A printing method that involves printing a test pattern with varying composite modes for different dot sizes of black ink, allowing users to select the most suitable composite black based on the printing medium, which is generated by combining ink droplets of cyan, magenta, and yellow inks to complement the black ink, either manually or through image processing to minimize color differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed composite mode is used to generate composite black from color ink droplets, then the printing process is simple, but the hue of composite black varies with different printing media leading to insufficient complementing of missing black ink pixels
Solution Approach 1:
The patent implements dynamic selection of composite modes based on the actual printing medium being used. The system provides multiple composite modes (first composite mode, second composite mode, etc.) with different color ink droplet combinations, and dynamically selects the appropriate mode based on user input or automatic detection of the printing medium type, allowing the composite black generation process to adapt to different media characteristics
Solution Approach 2:
The patent changes the parameters of composite black generation by offering multiple composite modes with different dot size combinations of color inks (cyan, magenta, yellow). Each composite mode uses different parameter combinations (dot sizes of 1st, 2nd, and 3rd color inks) to generate composite black, and the system selects the appropriate parameter set based on the printing medium to optimize the complementing effect
2Manufacturing precision
If the hue of composite black is optimized for one type of printing medium, then the complementing effect is good for that medium, but the solution becomes insufficient for other types of printing media
Solution Approach 1:
The patent creates a universal composite black generation system that can handle multiple types of printing media. By providing multiple composite modes that work across different media types (glossy, matte, transparent, etc.), the system achieves multi-functionality where a single printing apparatus can effectively complement missing black ink pixels on various printing media without requiring medium-specific hardware modifications
3Adaptability or versatility
If multiple composite modes are provided for different printing media, then the adaptability to different media is improved, but the device complexity increases
Solution Approach 1:
The patent implements an automatic composite mode selection feature where the system can automatically determine the appropriate composite mode based on the printing medium being used. This self-service capability reduces the burden on users by automatically selecting the optimal composite mode without requiring manual intervention, thereby maintaining adaptability while reducing operational complexity
Solution Approach 2:
The system incorporates feedback mechanisms where user selections or system detections about the printing medium type are fed back into the composite mode selection process. This feedback loop allows the system to learn from user preferences or automatically adjust to the appropriate composite mode based on the actual printing conditions, simplifying the user interface while maintaining high adaptability
Data Source
AI summary
A printing method for performing printing while complementing black with composite black, the printing method including: printing a test pattern having a plurality of patch images for which composite mode varies, this test pattern being printed for each dot size of the black to be complemented; causing a user to select a desired patch image from among the plurality of the patch images included in the printed test pattern, the selection being made for each of the dot size of the black ink to be complemented; and performing printing while complementing the black to be complemented with the composite black generated on a basis of the composite mode corresponding to the desired patch image selected correspondingly to the dot size of the black ink to be complemented.