Patent ID: 8376526

Claim:
An inkjet head, comprising: a first nozzle that jets pigmented ink; a first pressure chamber coupled to the first nozzle; a first actuator that selectively applies a jetting pressure to the pigmented ink in the first pressure chamber; a second nozzle that jets dye ink; a second pressure chamber coupled to the second nozzle; and a second actuator that selectively applies a jetting pressure to the dye ink in the second pressure chamber; wherein the first nozzle has a diameter of D 1 ; wherein the second nozzle has a diameter of D 2 ; wherein the first actuator has a first portion that applies the jetting pressure to the first pressure chamber, the first portion having a size of L 1 ; wherein the second actuator has a second portion that applies the jetting pressure to the second pressure chamber, the second portion having a size of L 2 ; and wherein D 1 , D 2 , L 1 , and L 2 satisfy the following formula: −xD 1 +yL 1 ≈−xD 2 +yL 2 , where x and y are predetermined coefficients; and wherein D 1 ≠D 2 .