Patent ID: 7316468
Filing Date: 2008-01-08
Classification: B41J

Abstract:
1. A full line type liquid droplet ejection head, comprising: a plurality of pressure chambers; and a plurality of nozzles which correspond to the pressure chambers and are two-dimensionally arranged through a length corresponding to a full width of a recording medium conveyed in a sub-scanning direction relatively to the liquid droplet ejection head, wherein a nozzle pitch Pn in the sub-scanning direction between two of the nozzles corresponding to two of the pressure chambers sharing a supply restrictor through which liquid is supplied to the two of the pressure chambers satisfies the following formula: where Pd is a minimum pitch between dots in the sub-scanning direction corresponding to a recording resolution in the sub-scanning direction of the dots on the recording medium, m is an integer not less than 1, and k is an arbitrary constant set in a range of 0.4≦k≦0.6, the two of the nozzles are mutually adjacent in a direction oblique to the sub-scanning direction, the two of the pressure chambers corresponding to the two of the nozzles are connected to a supply flow channel through supply ports through which the liquid is supplied to the two of the pressure chambers, the supply flow channel is connected to a common liquid chamber through the supply restrictor, each of the pressure chambers has approximately a square plane shape, in each of the pressure chambers, the nozzle and the supply port are arranged on a diagonal of the pressure chamber, and the supply ports of the two of the pressure chambers which are adjacent in the direction oblique to the sub-scanning direction are arranged in mutually proximate and opposing positions.