An ink jet recording apparatus provided with an ink jet recording head connected to an ink tank and having ink discharge ports and energy generating members for generating ink discharge energy, in which the head pressure of ink at the discharge ports is detected and the driving condition of the energy...http://www.google.com.hk/patents/US5179389?utm_source=gb-gplus-share專利 US5179389 - Ink jet recording with head driving condition regulation
