Patent ID: 7237885

Claim:
An ink cartridge, comprising: an ink chamber comprising a wall having a first end and a second end opposite the first end; a translucent portion positioned at the wall, wherein the translucent portion is configured to be in fluid communication with the ink chamber, and the translucent portion has an inner space formed therein; an ink supply portion having an opening formed therethrough, wherein the ink supply portion is positioned at the wall adjacent to the second end of the wall, and the translucent portion is positioned between the first end of the wall and the ink supply portion; a movable member comprising: a signal blocking portion, wherein the signal blocking portion is disposed within the inner space of the translucent portion; and a float portion disposed within the ink chamber, wherein the float portion is configured to move between a first position and a second position based at least on an amount of ink disposed within the ink chamber, wherein as the ink within the ink chamber is dispensed from the interior of the ink chamber to the exterior of the ink chamber a surface of the ink within the ink chamber moves in a first predetermined direction, and when the float portion moves from the first position to the second position each of the float portion and the signal blocking portion moves in a second predetermined direction which is slanted with respect to the first predetermined direction; and at least one guide, wherein the float portion slides along the at least one guide when the float portion moves from the first position to the second position.