Abstract: A head chip (2) includes an actuator substrate (3) having channels (5) for liquid ejection formed therein, and a cover plate (4) having a liquid supply chamber (6) for supplying liquid to the channels formed therein, the cover plate being stacked on the actuator substrate. The flow path member (7) is provided to the cover plate and supplies the liquid to the liquid supply chamber. The flow path member includes an inflow port (8) through which the liquid flows in, an outflow port (9) through which the liquid flows out, and a circulation path (10) along which the liquid is circulated from the inflow port to the outflow port. No filter is interposed in any of a flow path between the inflow port and the channels and a flow path between the outflow port and the channels.

Abstract: To position a storage medium simply/reliably. An ink bag unit is structured so as to be attachable to and detachable from a tray. When ink runs out, a new ink bag unit can be used by being mounted on the tray. An adapter portion holds a storage device that stores data regarding the ink. The adapter portion is inserted into an adapter insertion portion of the tray, whereby a position of the storage device in the ink cartridge is definitely determined. As described above, with regard to the ink cartridge, the tray can be used as a piece of equipment of a printing apparatus over and over again, and the ink bag unit can be distributed as a consumable article. Further, because the storage device is mounted to the adapter portion, connection between the printing apparatus and the storage device can be achieved reliably and easily when the ink cartridge is mounted to the printing apparatus.

Abstract: To position a storage medium simply/reliably. An ink bag unit is structured so as to be attachable to and detachable from a tray. When ink runs out, a new ink bag unit can be used by being mounted on the tray. An adapter portion holds a storage device that stores data regarding the ink. The adapter portion is inserted into an adapter insertion portion of the tray, whereby a position of the storage device in the ink cartridge is definitely determined. As described above, with regard to the ink cartridge, the tray can be used as a piece of equipment of a printing apparatus over and over again, and the ink bag unit can be distributed as a consumable article. Further, because the storage device is mounted to the adapter portion, connection between the printing apparatus and the storage device can be achieved reliably and easily when the ink cartridge is mounted to the printing apparatus.