Patent ID: 6447085
Filing Date: 2002-09-10
Classification: B41J

Abstract:
A driving method of an ink-jet recording head which comprises a discharge outlet for discharging ink, an ink flow passage communicating with said discharge outlet, and a heating element for heating the ink in the ink flow passage by applying a drive signal so as to generate a bubble, the head discharging the ink through the discharge outlet on the basis of the generation of the bubble, whereinthe drive signal comprises a first drive signal for storing foaming energy in the ink, and a second drive signal for generating a bubble in the ink, and the bubble is generated by applying, to the heating element, the drive signal in which: when the time, from application start of the second drive signal to bubble generation is &dgr;t, and the boundary foaming time, at which foaming energy decreases in case of generating a bubble only by the second drive signal without applying the first drive signal, is ts, &dgr;t and ts satisfy the relation: &dgr;tand, when the applying time of the first drive signal, which is the difference in time from the time at which application of the first drive signal is started to the time at which the second drive signal is started, is t1, the applying time of the second drive signal is (t2- t1), and the heating quantity of the heating element by the drive signal is Q(t), t1, t2, and Q(t) satisfy: 1t1&it;&Integral;0t1&it;Q&it;(t)&it;â€ƒ&it;&dd;t<1Î´&it;â€ƒ&it;t&it;&Integral;t1t2&it;Q&it;(t)&it;â€ƒ&it;&dd;t.