An ink jet recording apparatus includes an ink jet recording head which has an ink ejection outlet, an ink passage, a heater for heating ink to form a bubble in the ink so as to allow a part of the ink to be ejected from the ink ejection outlet in the form of an ink droplet, and a driving circuit for...http://www.google.com.au/patents/US6022092?utm_source=gb-gplus-sharePatent US6022092 - Ink jet recording apparatus with means for equalizing ink droplet volumes
