Patent ID: 7556328

Claim:
A liquid-droplet jetting apparatus which jets a droplet of a liquid onto a medium, comprising: a head which includes a pressure chamber in which the liquid is filled, a nozzle which communicates with the pressure chamber, a channel which is extended from the pressure chamber up to the nozzle, and an actuator which changes a volume of the pressure chamber; and a controller which controls the actuator to impart vibration to a meniscus of the liquid in vicinity of the nozzle by applying no-jetting drive pulses, which causes no jetting of the liquid onto the medium, to the actuator wherein: when a period of time during which a pressure wave generated due to the vibration is propagated in one way through the channel is AL, a pulse width of the no-jetting drive pulses is Tp, and an interval between each of the no-jetting drive pulses is Tw, a waveform of the no-jetting drive pulses satisfies one of 0.1AL≦Tp≦0.2AL, 0.2AL≦Tw≦4.5AL; 0.1AL≦Tp≦0.15AL, 0.1AL≦Tw≦4.5AL; 0.1AL≦Tp≦0.35AL, 0.4AL≦Tw≦1.0AL; 0.1AL≦Tp≦0.3AL, 0.4AL≦Tw≦1.5AL; 0.1AL≦Tp≦0.3AL, 2.5AL≦Tw≦3.5AL; 0.1AL≦Tp≦0.25AL, 2.5AL≦Tw≦4.5AL; and 0.1AL≦Tp≦0.3AL, 4.2AL≦Tw≦4.5AL.