A liquid jet recording head includes a liquid path communicating with a discharge opening through which a liquid is discharged; a plurality of heating elements disposed in the liquid path, each of the heating elements having a different minimum power requirement for enabling the liquid to be discharged;...http://www.google.de/patents/US5481287?utm_source=gb-gplus-sharePatent US5481287 - Liquid jet recording head having a plurality of heating elements and liquid jet recording apparatus having the same
