Thermal inkjet technology (TIJ) has been the widely preferred method of inkjet printing since its market inception in 1985. Thermal inkjet technology continues to enjoy a greater unit market share for printers than any other printing technology. In this presentation history of inkjet printing will be discussed. In the recent past, thermal inkjets have made great strides. Speed of printing is a strong function of the swath size and can be increased by increasing the chip size. Photo quality printing has reached new levels by reducing drop size and spot size. This has been achieved by increasing nozzle density, increasing frequency of printing and using multiple pass printing to optimize quality. However, to improve speed of printing single pass resolution is an important parameter. The paper presents the simple working principle of the inkjet printhead. The physics of printhead operation will be shown briefly. A thermal analysis is carried out on the printhead. Simulations of printing on paper has been carried out for hypothetical print densities and compared with simple experiments. The scales that appear range from microns to millimeters. Short term and long term analysis has been carried out.
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