Patent ID: 8052260

Claim:
An ink cartridge comprising: a case comprising: an ink chamber configured to store ink therein; a first wall facing an exterior of the case; and a translucent portion positioned at the first wall and having an inner space formed therein, wherein the inner space is continuous with the ink chamber; a first movable member positioned in the case, and configured to move relative to an amount of ink stored in the ink chamber, wherein the first movable member comprises a particular signal blocking portion positioned in the inner space; and a second movable member coupled to the case, wherein the second movable member comprises a second wall facing the first wall, wherein the second wall has an opening formed therethrough, and the second movable member is configured to move between a first position and a second position, and the second wall is positioned closer to the first wall when the second movable member is in the second position than when the second movable member is in the first position.