| 摘要 |
Ink cartridges 1 a to 1 c for storing light-transmissive inks include a shutter arranged therein so that the shutter is movable depending on the ink residual amount, and a projection 51 having light transmittance and passing the shutter therethrough. An ink cartridge 1 d for storing a nontransparent ink includes a projection 51 having light transmittance. Optical sensors 21 a to 21 c, which detect the shutter at the projection 51 of the ink cartridges 1 a to 1 c respectively, are arranged at a position higher in the vertical direction than a position of arrangement of an optical sensor 21 d detecting the ink at the projection 51 of the ink cartridge 1 d. It is possible to use both an ink cartridge for storing a light-transmissive ink and an ink cartridge for storing a nontransparent ink, and the ink amount is correctly detected for any one of the cartridges.
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