This paper investigates the capabilities of a micro system design for a silicon-based thermal inkjet printhead. The presented design is based on the experiences with an earlier prototype of a bubble jet printhead containing 50 drop ejectors and a printing resolution of 300 dpi. In order to minimize the number of leads connecting the printhead with the printer, an electronic circuit has been integrated on chip. This provides also a lot of features for testing and monitoring the printhead. Due to the electronic circuit a detailed test procedure can be carried out. The test routine reveals data transmission errors, and short and open circuits of the MOSFET power switches. The presented smart printhead has an integrated sensor monitoring chip temperature and a timer supervising the heating pulses which prevents the heater elements from being damaged. Because of current limitations the heater elements have to be fired in groups. Depending on the number and position of spots that are printed at one time there are more or less visible artefacts. Computer simulations have been carried out to evaluate the effect of different timing sequences on print quality.
"Design aspects for a smart thermal ink-jet print head", Proc. SPIE 2413, Color Hard Copy and Graphic Arts IV, (27 April 1995); doi: 10.1117/12.207577; https://doi.org/10.1117/12.207577