Ink-jet recording apparatus

An inkjet recording apparatus comprising:

• an inkjet head including:
• a plurality of nozzles which eject ink,
• a plurality of pressure chambers which are provided in communication with the respective nozzles and store ink to be ejected from the nozzles,
• a plurality of pressure generators which are provided so as to correspond to the respective pressure chambers and apply pressure to ink in the pressure chambers,
• a plurality of individual communication flow channels which are provided so as to branch from the respective pressure chambers or from respective communication channels between the pressure chambers and the nozzles, and from which ink in the pressure chambers is discharged, and
• a common flow channel which is connected to the individual communication flow channels and at which ink discharged from the individual communication flow channels merges with each other;
• and
• an ink feeder which generates a circulatory flow of ink from the pressure chambers to the individual communication flow channels, wherein
• a relation between Fn and Fi when ink is ejected from the nozzles satisfies the following expression (1), Fn being an ink amount per unit time which is ejected from a nozzle that ejects a maximum amount of ink per unit time among all the nozzles provided in the inkjet head, and Fi being an average ink flow amount per unit time which is discharged from the individual communication flow channels to the common flow channel, and
• a relation between Rc and Rt satisfies the following expression (2), Rc being a flow channel resistance of the common flow channel and Rt being a combined resistance of the individual communication flow channels connected to the common flow channel.
• (Fn/Fi)≤10 Expression (1)
• (Rc/Rt)≤10 Expression (2)