An ink jet recording head is disclosed. The recording head includes a plate member provided with discharge openings for discharging ink and a head main body having an ink channel communicating with the discharging openings. The head main body is bonded to the plate member at a bonding surface and an...http://www.google.com.au/patents/US4994825?utm_source=gb-gplus-sharePatent US4994825 - Ink jet recording head equipped with a discharging opening forming member including a protruding portion and a recessed portion
