Effect of electrophotographic processes on print quality in LED printers

John R. Wyhof

doi:10.1117/12.19860

1 August 1990 Effect of electrophotographic processes on print quality in LED printers

John R. Wyhof

Proceedings Volume 1254, Optical Hard Copy and Printing Systems; (1990) https://doi.org/10.1117/12.19860
Event: Electronic Imaging: Advanced Devices and Systems, 1990, Santa Clara, CA, United States

Abstract

The advantage of LED electrophotographic page printers is closely linked to the the process parameters of the printer. The electrical and mechanical processes and material properties were analyzed with respect to the affect on the print quality. Most critical to the print quality for the LED array printer is the constancy of the light intensity since the elements in the array are each independent light sources. It was found that the spot size can change significantly if the light intensity varies. Halftone printing uses the spot size to space size ratio to create the grayscale. The light intensity variation between elements can be 20 in non-compensated LED head arrays. If the need for light intensity compensation can be eliminated then a significant cost reduction in the LED head can be achieved. However the parameters of the basic electrophotographic processes must be carefully selected to assure a constant spot size and optimum print quality. The development method toner properties and the portion of the photoreceptor discharge curve used have the strongest influence on the spot size and halftone print quality. Transfer fusing and mechanical parameters have minimal effect. 1. LED PRINTING PROCESS The advantages of the LED printing process for high speed electrophotographic printers are well known. 1 Recently several printer manufacturers have introduced electrophotographic LED printers in the lower speed range. When compared to the scanning laser beam or liquid crystal

Citation Download Citation

John R. Wyhof "Effect of electrophotographic processes on print quality in LED printers", Proc. SPIE 1254, Optical Hard Copy and Printing Systems, (1 August 1990); https://doi.org/10.1117/12.19860

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