| 摘要 |
<p>An ink cartridge comprises an ink reservoir, storing ink therein; a reflector (39A, 39B), arranged so that light emitted from an external light emitter (30a) is absorbed by the ink when the reflector (39A, 39B) is in contact with the ink in the ink reservoir, and light emitted from the external light emitter is reflected to an external light receiver (30b) when the reflector (39A, 39B) is in contact with air in the ink reservoir; and a shading member(42A, 42B), which shades an optical path originated from the external light emitter to the external light receiver when the ink cartridge is mounted on a cartridge holder.</p> |
