| 摘要 |
An ink cartridge includes an ink pack 21 which discharges ink from an ink outlet 22 upon reception of pressure by air pressure; an outer case 20 a, 20 b which houses the ink pack 21 therein with the ink outlet 22 exposed so that the ink pack 21 can be pressurized by the air pressure, and includes a pressurized air inlet 23 that is connectable to an air source for pressurizing the ink pack 21 ; and a pressure adjusting unit 30 which is housed in the outer case and discharges air in the outer case to the outside so that pressure in space of the outer case is kept at a setting value. The setting value of the pressure adjusting unit 30 is set to an optimum value for each ink cartridge, whereby the ink pack can be pressurized in an optimum state regardless of the air pressure from the pressurized air inlet 23.
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