An ink jet recording head includes an ejection outlet for ejecting ink; an ink passage provided corresponding to the ejection outlet; a thermal energy generator to heat the ink in the passage to create a bubble; a flow resistance element, disposed in the ink passage upstream of the thermal energy generator...http://www.google.com.au/patents/US6341849?utm_source=gb-gplus-sharePatent US6341849 - Ink jet recording apparatus having flow resistance elements and driving method therefor
