An ink jet recording apparatus has a recording head provided with a plurality of ink discharging openings, ink paths leading to the ink discharging openings and an ink chamber commonly connected to the ink paths. Each ink path has a recording thermal energy generating element for causing film boiling...http://www.google.de/patents/US5479196?utm_source=gb-gplus-sharePatent US5479196 - Ink jet recording apparatus and method of recovery ink discharging condition of the same
