| 摘要 |
PROBLEM TO BE SOLVED: To suppress variation in liquid ejection characteristics between ejection ports.SOLUTION: Sixteen grooves 109a and ten dummy grooves 109b extending in a main scanning direction are arranged in parallel with each another in a sub main scanning direction on an ejection surface 2a of the head. The ejection port 108a ejecting an ink droplet is formed on a bottom part of the groove 109a. A groove group X1 constituted by two of the grooves 109a, groove groups X2-X4 constituted by four of the grooves 109a, and a groove group X5 constituted by two of the grooves 109a are arranged in order from one side of the ejection surface 2a in the sub scanning direction. Separation distances l1-l4 between the adjacent groove groups X1-X5 are larger than separation distances 1a-1k between the adjacent grooves 109a in the groove groups X1-X5. The dummy groove 109b is respectively arranged on both sides of the groove groups X1-X5 in a sub conveying direction. |
