Patent ID: 7341322

Claim:
A liquid jet head for jetting liquid droplets to a receiving medium and forming a dot pattern on said receiving medium, said liquid jet head comprising: a liquid jetting orifice from which liquid droplets are jetted; a channel connected to said jetting orifice, said channel being filled with liquid and equipped with an energy applying member for applying energy to the liquid in said channel on demand so that liquid droplets are jetted from said liquid jetting orifice, wherein a cross sectional area of said liquid jetting orifice is within a range from 200 μm 2 to 500 μm 2 , and wherein said energy applying member applies the energy to the liquid so that the liquid droplets, each of which has a flying velocity equal to or greater than 5.2 m/second, are jetted at a frequency which is within a range from 10 kHz to 40 kHz.