Patent ID: 7192118

Claim:
A droplet ejecting head in which a plurality of ejectors for ejecting a droplet are two-dimensionally arranged and the droplet is ejected while the droplet ejecting head is moved in a main scanning direction relative to a recording medium, characterized in that: the ejectors are arranged such that, when the ejectors are viewed in order in the main scanning-orthogonal direction, which is orthogonal to the main scanning direction, positions of the ejectors in the main scanning direction alternate in an offsetting manner, such that sizes of dot diameters of droplets from the plurality of ejectors is changed at random, wherein the ejectors are divided, in the main scanning direction, into k (k is a natural number more than one) ejector blocks, each ejector block includes at least one ejector unit disposed in the main scanning-orthogonal direction, each ejector unit includes n (n is a natural number more than one) ejectors adjacent in the main scanning direction, wherein each of the ejectors has a nozzle pitch p, and the ejectors of each ejector unit are offset from each other in the main scanning-orthogonal direction, by a desired pitch p×k, and wherein there is a relationship M L /k=n between a total number of columns M L of the ejectors, k and n.