Patent ID: 7669994

Claim:
An ink cartridge, comprising: a particular wall; a protruding member extending from the particular wall in a particular direction; a protrusion extending from the particular wall in the particular direction; an ink chamber configured to store ink therein; a translucent portion defining an enclosure comprising at least one pair of wall surfaces which oppose each other and have a space formed therein, wherein the space is configured to be in fluid communication with the ink chamber, and the translucent portion is positioned between the protrusion and the protruding member; an ink supply portion configured to supply ink from an interior of the ink chamber to an exterior of the ink chamber, wherein the ink supply portion is positioned between the protrusion and the protruding member; and a signal blocking member positioned within the enclosure, wherein the signal blocking member is configured to move within the enclosure based at least on an amount of ink disposed within the ink chamber, and the signal blocking member is sandwiched between the at least one pair of wall surfaces.