Patent ID: 8267506

Claim:
An ink jet printer device comprising: a recording medium transportation mechanism to transport a recording medium in a transportation direction, an ejection portion with at least one ink cartridge that ejects an ink droplet onto a recording medium via a respective nozzle; a humidification portion that is provided upstream of the ejection portion in the transportation direction of the recording medium, the humidification portion having a cartridge that ejects a colorless liquid droplet onto the recording medium via a respective nozzle; and a control portion that is configured to control the ejection of the ink droplet onto the recording medium from the ejection portion and the ejection of the liquid droplet onto the recording medium from the humidification portion, wherein, the nozzles of the ejection portion and the humidification portion are aligned along the transportation direction, the nozzle of the humidification portion is disposed upstream relative to the ejection portion with respect to the transportation direction, and the ejection portion is humidified during printing by letting the liquid droplet ejected onto the recording medium evaporate from the recording medium.