Patent attributes
An ink cartridge includes an ink chamber including a wall, a translucent portion positioned at the wall, in which the translucent portion has an inner space formed therein, and a movable member. The movable member includes a first portion disposed within the inner space of the translucent member, and the first portion includes a first protrusion portion formed on a first surface of the first portion. The movable member also includes a second portion disposed within the ink chamber, and a portion of the first portion of the movable member has a surface having a first surface roughness, and portion of the second portion of the movable member has a surface with a second surface roughness. Moreover, the first surface roughness is greater than the second surface roughness, and the first protrusion portion extends further towards a first interior surface of the translucent portion than the portion of the first portion having the first surface roughness.
