An ink ejecting device includes ink channels intercommunicating with slits and air channels intercommunicating with another slits. The ink channels and the air channels have a narrow shape with a rectangular cross-section, and all of the ink channels are filled with ink and the air channels are filled...http://www.google.de/patents/US5646661?utm_source=gb-gplus-sharePatent US5646661 - Ink ejecting device having alternating ejecting channels and non-ejecting channels
