Patent ID: 6467890
Filing Date: 2002-10-22
Classification: B41J

Abstract:
An ink jet cartridge mountable for use in an ink jet recording apparatus so as to be movable in said ink jet recording apparatus along a scanning direction during discharge of ink, said ink jet cartridge comprising:an ink jet head unit for discharging ink from plural ejection ports arranged in a port direction which is substantially perpendicular to the scanning direction; and an ink tank unit having an ink supply port for supplying ink to said ink jet head unit; wherein said ink tank unit has a partition portion comprising at least first and second side walls for partitioning said ink tank unit into at least a receiving portion for receiving a negative pressure generating member and an ink storing portion for storing ink to be supplied to said ink jet head unit, said receiving portion having a negative pressure generating member and having an air vent communicated with ambient atmosphere, both of said first and second side walls being common with said ink storing portion and with said negative pressure generating member receiving portion, with said first side wall extending in said scanning direction and substantially perpendicular to said port direction, and with said second side wall extending in a direction perpendicular to said scanning direction and substantially along said port direction; wherein said ink supply port is provided on said negative pressure generating member receiving portion; and wherein said partition portion has an ink communicating portion for liquid communication between said ink storing portion and said negative pressure generating member receiving portion, said ink communicating portion being formed in said first side wall, which extends in the scanning direction and substantially perpendicular to said port direction, to permit movement and supply of the ink in a direction crossing with the scanning direction and along the port direction, and across said first side wall; and wherein said ink storing portion is substantially sealed except said ink communicating portion.