Image Number 14 for United States Patent #7178911.
An ink cartridge includes a cartridge case; an ink chamber situated within the cartridge case; an ink supply opening formed in the cartridge case for supplying ink from the ink chamber to an exterior of the cartridge; and a lever mechanism provided in the ink chamber, the lever mechanism including a light blocking member at a first end of the lever mechanism, the lever mechanism being rotatable about a rotation point on the lever mechanism, and the light blocking member being movable in association with rotation of the lever mechanism.
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