Patent ID: 8915581

Claim:
An ink cartridge, comprising: a first signal blocking section selectively preventing a first signal from passing through said first signal blocking section or changing the path of said first signal; and a second signal blocking section selectively preventing a second signal from passing through said second signal blocking section or changing the path of said second signal, wherein said second signal blocking section is a movable component and is in an initial ink cartridge installation detection position before detection, and said initial ink cartridge installation detection position determines whether or not said second signal blocking section prevents said second signal from passing through said second signal blocking section or changes the path of said second signal, wherein said ink cartridge also comprises an ink storage cavity for storing ink, wherein said second signal blocking section can move to an ink level detection position corresponding to a second sensor in a printer wherein a linkage detects the ink level, and the second signal blocking section is moved by the linkage, wherein said movement refers to horizontal translation or swinging movement around a shaft, and when said second signal blocking section moves to said ink level detection position, said second signal blocking section selectively prevents said second signal from passing through said second signal blocking section or changes the path of said second signal again, wherein said ink storage cavity is in the form of an ink bag, and the volume of a cavity body is varied with the ink level.