Patent ID: 6331039
Filing Date: 2001-12-18
Classification: B41J

Abstract:
An ink jet recording apparatus in which thermal energy is applied to ink in accordance with driving signals applied to a heater of a recording head to produce a bubble, by which the ink is ejected onto a recording material, said apparatus comprising:driving means for applying a plurality of the driving signals to the heater for ejection of one ink droplet, wherein the driving signals comprise a first driving signal not ejecting the ink and a second driving signal for ejecting the ink, the second driving signal being applied after a rest period after the first driving signal, each of the first and second driving signals and the rest period having a length; andpulse width modulating means operable in first and second changing regions for controlling an ejection amount of ink by changing at least one of the length of the rest period and the length of the first driving signal applied by said driving means,wherein said modulating means effects its changing operation in the first changing region in which the length of the rest period is changed without changing the length of the first driving signal and in the second changing region in which the length of the first driving signal is changed without changing the length of the rest period, and wherein control of the ejection amount in the first changing region is such that the ejection amount is larger than the ejection amount in the second changing region.