Patent ID: 7591537
Filing Date: 2009-09-22
Classification: B41J

Abstract:
1. An ink jet head movable in a main scan direction, comprising: a first group of ejection outlet arrays disposed at one side of a common liquid chamber and including a first ejection outlet array and a second ejection outlet array disposed adjacent to said first ejection outlet array, wherein amounts of liquid ejection of ejection outlets of said first ejection outlet array and amounts of liquid ejection of ejection outlets of said second ejection outlet array are different from each other, and said ejection outlets of said first ejection outlet array and said ejection outlets of said second ejection outlet array are disposed in a staggered arrangement; a second group of ejection outlet arrays disposed at the other side of the common liquid chamber and including a common ejection amount ejection outlet array having ejection outlets for ejecting an amount of the liquid which is the same as one of the amounts of liquid ejection of said ejection outlets of said first ejection outlet array and said second ejection outlet array and including a non-common ejection amount ejection outlet array disposed adjacent to said common ejection amount ejection outlet array and having ejection outlets for ejecting an amount of the liquid which is different from the amounts of liquid ejection of said ejection outlets of said first ejection outlet array group, wherein said ejection outlets of said common ejection amount ejection outlet array and ejection outlets of said non-common ejection amount ejection outlet array are disposed in a staggered arrangement; a plurality of sets each comprising said first ejection outlet array group and said second ejection outlet array group, wherein said sets are provided for each of at least cyan and magenta colors, respectively; wherein said ejection outlets of said second ejection outlet array group are disposed with deviation of ½ of an interval at which said ejection outlets of said first ejection outlet array group are arranged, relative to said ejection outlets of said first ejection outlet array group, wherein in said non-common ejection amount ejection outlet arrays in different ones of sets for the same color, are disposed with deviation of ½ of an interval at which said ejection outlets of said non-common ejection amount ejection outlet arrays in said different ones of sets are arranged.