Patent ID: 7458662

Claim:
A liquid droplet-jetting head which jets liquid droplets at a predetermined resolution while moving relative to an object, the liquid droplet-jetting head comprising: a flow passage unit which has a plurality of nozzles for discharging the liquid droplets and a nozzle surface in which the nozzles are formed; wherein a ratio of a secondary mode frequency of inter-nozzle proper vibration in relation to an inter-nozzle direction along a line connecting a nozzle of the nozzles and another nozzle in the nozzle surface, to a jetting frequency which is a reciprocal of time required for the object to move relative to the liquid droplet-jetting head by a unit distance corresponding to the predetermined resolution, is one of a value of-not more than 0.85, a value in a range of 1.25 to 1.96, and a value of not less than 3.44.