Ink cartridge used with an ink jet printer

摘要

An ink cartridge used with an ink jet printer. The ink cartridge has an ink reservoir and a housing to cover the ink reservoir with a negative pressure maintenance unit therebetween to maintain the inner pressure of the ink reservoir under a negative pressure. Since the negative pressure maintenance unit does not contact ink in the ink reservoir, the negative pressure maintenance unit does not corrode. In addition, the negative pressure maintenance unit is installed between the housing and the ink reservoir while occupying a small space, and thus improving the filling efficiency of ink in the ink reservoir.