Patent ID: 7533950

Claim:
A liquid jet recording apparatus for jetting ink droplets to a recording medium in accordance with image data on demand so that an image having pixels corresponding to the image data is formed on said recording medium, said liquid jet recording apparatus comprising: ink jetting orifices from which ink droplets are jetted; ink paths connected to said ink jet orifices, said ink paths being filled with ink and equipped with energy applying members for applying energy to the ink in said ink paths on demand so that ink droplets are jetted from said ink jetting orifices, wherein a cross sectional area of each of said ink jetting orifices is within a range from 200 μm 2 to 500 μm 2 , and wherein said energy applying members apply the energy to the ink so that the ink 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; and control means configured to control a number of ink droplets which are jetted to form each pixel of the image formed on said recording medium based on the image data, wherein each of said ink jetting orifices has a size that an amount of ink is jetted so that adjacent pixels are separated from each other on said recording medium when each pixel is formed of a single ink droplet, thereby forming a gray image, the image becoming darker based on the number of ink droplets jetted to form each pixel.