Patent ID: 7380925

Claim:
An ink cartridge, comprising: a first side wall; a second side wall opposite from the first side wall; a front wall; a back wall opposite from the front wall; a bottom wall; a top wall opposite from the bottom wall; and an ink chamber formed in a space enclosed by the first side wall, the second side wall, the front wall, the back wall, the bottom wall and the top wall; wherein: the bottom wall includes an ink supply opening through which ink may be supplied to a print head; a protruding region of the ink cartridge protrudes outwardly from the first side wall; and at least one portion of the protruding region is capable of preventing light from passing through the at least one portion in a direction from a front wall side of the protruding region to a back wall side of the protruding region, at least when the ink cartridge contains a predetermined amount of ink.