An ink jet head having a plurality of electrothermal transducer elements in one liquid passage is arranged so that the ratio of the areas of two of the plurality of electrothermal transducer elements is smaller than the ratio of the amounts of ink ejected by the two electrothermal transducer ...http://www.google.de/patents/US5754201?utm_source=gb-gplus-sharePatent US5754201 - Liquid jet head, head cartridge, liquid jet apparatus, method of ejecting liquid, and method of injecting ink 
