Patent ID: 6951376

Claim:
A method for recording an image on a recording medium through an ink-jetting process, comprising the steps of: heating an ink, containing at least photo-polymerizing compound and coloring material, to a temperature in a range of 40-150° C.; expanding and shrinking a volume of an ink channel, which accommodates said ink and which is driven as electromechanical converting actions, by applying a first electronic pulse for generating a negative pressure in said ink channel and by successively applying a second electronic pulse for generating a positive pressure in it, to emit an ink particle from a nozzle of said ink channel onto said recording medium so as to form said image thereon; and irradiating ultraviolet light onto said recording medium to fix said image thereon; wherein, at a time after said ink particle is emitted by applying a first driving pulse, being a combination of said first electronic pulse and said second electronic pulse, to said ink channel and before an ink meniscus, formed at said nozzle, grows to an original stable state, a next ink particle is emitted by applying a second driving pulse, being a next combination of said first electronic pulse and said second electronic pulse; and wherein a ratio between absolute voltage values of said first electronic pulse and said second electronic pulse, both included in said second driving pulse, is defined as the equations of R=V 1 / V 2 and 1.0 ≦R ≦5.0 where R: said ratio, V 1 : an absolute voltage value of said first electronic pulse, V 2 : an absolute voltage value of said second electronic pulse; and wherein a duration time of said first electronic pulse, included in said second driving pulse, is substantially equal to half an acoustical resonance period of said ink channel, while a duration time of said second electronic pulse, included in said second driving pulse, is substantially equal to twice said acoustical resonance period of said ink channel.