In a thin film resistor substrate for a thermal ink jet printhead, there is provided an elongated ink feed slot for supplying ink to a plurality of heater resistors on the substrate. Ink flows from this slot vertically through the substrate and then laterally along predetermined ink flow paths in an...http://www.google.com.tw/patents/US4683481?utm_source=gb-gplus-share專利 US4683481 - Thermal ink jet common-slotted ink feed printhead
