Patent ID: 6419337
Filing Date: 2002-07-16
Classification: B41J

Abstract:
An ink jet recording apparatus, comprising:an ink jet recording head, including a nozzle orifice, a pressure chamber communicated with the nozzle orifice, and a pressure generating element which generates pressure fluctuation in ink stored in the pressure chamber to elect an ink drop from the nozzle orifice; a drive signal generator, which generates a series of drive signals, each drive signal including at least three primary ejecting pulses generated at a first cycle in a unit recording period and at least one auxiliary ejecting pulse generated after a time period which is a half of the first cycle is elapsed since one of the primary ejecting pulse is generated, the primary ejecting pulses and the auxiliary ejecting pulse having an identical waveform; and a pulse supplier, which selectively applies at least one of the primary ejecting pulses and the auxiliary pulse from the drive signal to the pressure generating element so that the number of ink drops ejected in the unit recording period is changed in accordance with a size of dot to be recorded, the pulse supplier selecting supplied pulse such that time intervals of the supplied pulses are made constant over adjacent unit recording periods when dots having the same size are successively recorded.