| 摘要 |
An ink cartridge contains an ink absorbent in an ink chamber, to absorb and hold ink by a capillary force. The ink absorbent has a cutout in its lower portion, to form a compartment without the ink absorbent. An ink detection zone is defined in the compartment, for an ink run-out sensor to detect the ink in the ink chamber. As the ink is consumed and the liquid surface of the ink goes down, an interface between the ink absorbent and the compartment enhances the resistance to the ink flowing from the ink absorbent toward the ink detection zone, so the ink is hindered from flowing into the ink detection zone, and the ink run-out sensor exactly detects that the liquid surface of the ink goes below the ink detection zone.
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