Patent ID: 8197044

Claim:
An ink cartridge comprising: a frame, wherein at least the frame defines an ink chamber therein, and the ink chamber is configured to store ink therein; a translucent portion extending from the frame in a first direction, wherein the translucent portion has an inner space formed therein, and the inner space is configured to be in fluid communication with the ink chamber; a movable member configured to selectively move within the ink chamber in a second direction between a first position and a second position and in a third direction opposite the second direction between the second position and the first position based on an amount of ink in the ink chamber, wherein the first direction is substantially perpendicular to the second direction and the third direction, and the movable member comprises: a signal blocking portion configured to be positioned within the inner space of the translucent portion; and an arm portion connected to the signal blocking portion, wherein the arm portion is positioned within the ink chamber and outside the translucent portion, and the arm portion comprises a first portion and a second portion, wherein the first portion is raised with respect to the second portion in one of the second direction and the third direction; and a partitioning member extending from the frame towards the movable member, wherein the partitioning member comprises a plurality of particular projections configured to prevent ink film from forming between the partitioning member and the movable member, and each of the plurality of particular projections extend from a surface of the partitioning member in the second direction.