Patent ID: 6948795

Claim:
An ejection device comprising a stage and head groups being relatively movable with respect to the stage, wherein each head group comprises a first head, a second head, a third head, and a fourth head, each having P ejection nozzles which are arranged such that a nozzle pitch of each of the first head, the second head, the third head, and the fourth head in an X-axis direction becomes a first length, the first head and the second head are adjacent to each other in a Y-axis direction, and the third head and the fourth head are adjacent to each other in the Y-axis direction, with respect to an X coordinate shifted by a second length from an X coordinate of a reference nozzle of the first head, an X coordinate of a reference nozzle of the second head is further shifted by a length ½ times shorter than the first length, with respect to an X coordinate shifted by the second length from an X coordinate of a reference nozzle of the third head, an X coordinate of a reference nozzle of the fourth head is further shifted by a length ½ times shorter than the first length, with respect to an X coordinate shifted by the second length from the X coordinate of the reference nozzle of the second head, the X coordinate of the reference nozzle of the third head is shifted by a length ¼ times or ¾ times shorter than the first length, the second length is P/4 times shorter than the first length, P is a natural number equal to or greater than 2, and the X-axis direction is orthogonal to the Y-axis direction.