Proceedings PaperHigh quality LED printhead aging study
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In a high quality LED printing system, the non-uniformity of the printhead system not only has to be corrected but maintained over an extended period. To further understand the impact of LED printhead aging on realistic high quality Electrophotographic printing system, we have designed and built a LED printhead aging system and used a 400 dpi printhead to simulate actual printing in a control environment (temperature and drive current). We have pushed this study to an equivalent 40 million pages in printing. A representative image suite for document printing is scanned in and used as the actual printing images. The printhead non-uniformity has been previously corrected before the aging experiment starts. During the aging experiment, the printhead pixel irradiance on the film plane was periodically rescanned radiometrically and the exposure non-uniformity of the printhead using the original correction was calculated and compared with a halftone visual detectability curve. Printhead aging due to realistic image printing usage does not appear to create noticeably observable banding problem even after 40 million pages of simulated printing.