Patent ID: 7806511
Filing Date: 2010-10-05
Classification: B41J

Abstract:
1. A liquid ejection apparatus, comprising: plural nozzles for ejecting liquid therefrom; plural pressure chamber groups, each group including plural pressure chambers, the pressure chambers of the plural pressure chamber groups respectively communicating with the plural nozzles to eject the liquid from the plural nozzles by pressure fluctuations; a common liquid chamber group including plural common liquid chambers, each of the plural common liquid chambers being provided for and connected to the plural pressure chambers of a respective one of the pressure chamber groups, and being supplied with the liquid to be ejected from the nozzles communicating with the pressure chambers of the respective one of the pressure chamber groups; liquid supplying ports respectively connected to one ends of the common liquid chambers to supply the liquid to the common liquid chambers; a common passage including plural connection passages respectively extending from other ends of the common liquid chambers and connected to one another; and a discharge port formed in the common passage and opened to the exterior; wherein the common liquid chambers adjacent to each other and the connection passages extending from the adjacent common liquid chambers are separated by a partition wall, the partition wall having a first side surface and a second side surface opposite the first side surface, the first side surface defining one of side surfaces of the common chamber and one of side surfaces of the connection passage extending from the common chamber, the second side surface defining one of side surfaces of the other common chamber and one of side surfaces of the other connection passage extending from the other common chamber; and the partition wall has a curved surface connecting the first side surface to the second side surface in a vicinity of a position where the connection passages having the partition wall placed therebetween are connected to each other, and a curvature of the curved surface is larger than a curvature of an arc having a diameter equal to a width of the partition wall.