Recording Head Discharge Timing Adjustment for Image Quality
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Solution Overview
Problem
Conventional methods for adjusting discharge timing in recording heads with multiple nozzle arrays fail to account for shifts in non-complementary regions, leading to uneven concentration and image squareness deviations due to differences in nozzle arrangement and paper feeding speed.
Innovation Solution
A method that measures and adjusts discharge timing for both complementary and non-complementary regions in a recording head, ensuring the recording shift amount in the complementary region falls within the range of non-complementary regions, thereby reducing uneven concentration and image squareness deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If discharge timing is adjusted only in complementary regions to minimize recording shift, then concentration uniformity in complementary regions improves, but recording shift variation increases in non-complementary regions causing uneven concentration and image squareness deviations
Solution Approach 1:
The patent divides the recording head into complementary regions and non-complementary regions, and further segments the non-complementary regions into paper feeding side and paper ejection side non-complementary regions. Different discharge timing adjustments are applied to each segment based on their specific recording shift characteristics, allowing precise control of recording shift in each region while maintaining overall concentration uniformity and image squareness
Solution Approach 2:
The patent applies different discharge timing adjustment strategies to different regions: in complementary regions, discharge timing is adjusted to minimize recording shift; in paper feeding side non-complementary regions, a different adjustment is applied; and in paper ejection side non-complementary regions, yet another adjustment is applied. This local quality approach ensures each region's specific characteristics are addressed, reducing recording shift variation and improving concentration uniformity across the entire recording head
2Manufacturing precision
If complex adjustments are made for each nozzle array to eliminate recording shift variation, then manufacturing precision improves, but device complexity and adjustment difficulty increase significantly
Solution Approach 1:
The patent merges the adjustment approach by defining a unified adjustment framework that categorizes all nozzle arrays into complementary and non-complementary regions. Instead of treating each nozzle array independently, the patent combines them into regional groups with standardized adjustment procedures, significantly reducing device complexity while maintaining precise recording shift control across all regions
Data Source
AI summary
When discharge timing of a first head module and a second head module, adjacent to each other, is adjusted in a recording head in which a plurality of head modules each having s nozzle array in which a plurality of nozzles is arranged in different positions in a first direction is joined in a second direction intersecting with the first direction, the discharge timing is adjusted so that a complementary region recording shift amount being a recording shift amount in the first direction in a complementary region in a joined portion between the first head module and the second head module becomes a value between a first non-complementary region recording shift amount and a second non-complementary region recording shift amount that are recording shift amounts in the first direction in respective non-complementary regions in the first head module and the second head module.