An ink jet head includes a heater board having a substrate on which a plurality of energy generating elements for generating energy utilized to discharge ink are provided, and a wall member joined to the heater board. The wall member has a plurality of flow passage walls which partially define flow passages,...http://www.google.com.au/patents/US5992981?utm_source=gb-gplus-sharePatent US5992981 - Ink jet head, ink jet apparatus, and method of and apparatus for manufacturing the head
