Patent ID: 8398207

Claim:
An apparatus comprising: a plurality of nozzles, each nozzle including a pressure chamber which houses an electrothermal transducer provided on a substrate to apply ejection energy to ink, an ink ejection orifice which faces the electrothermal transducer, and an ink passage along which the ink is supplied to the pressure chamber; and an ink supply port provided on the substrate, the ink supply port communicating with the ink passages, wherein a distance between a center of gravity of the electrothermal transducer and the ink supply port differs between the nozzles which are next to each other, and wherein, in at least one of the nozzles, a center of gravity of the ink ejection orifice is offset from the center of gravity of the electrothermal transducer in a direction toward the ink supply port by an amount, the amount being increased as the distance increased, and wherein the amount the distance increases is based on properties of ink being used.