Patent ID: 6742881
Filing Date: 2004-06-01
Classification: B41J

Abstract:
An ink container comprising:a negative pressure generating member accommodating portion for accommodating a negative pressure generating member for retaining therein pigment ink to be supplied to an ink jet head; an ink supply port for supplying the ink to said ink jet head; an air vent for fluid communication between said negative pressure generating member accommodating portion and an ambient air; and an ink non-transmitting portion for partly blocking flow of the ink in the negative pressure generating member toward said ink supply port, wherein fluid communication is enabled except for the non-transmitting portion, and a sectional area, across a general direction of the flow of the ink toward said ink supply port in said negative pressure generating member accommodating portion, of non-communicating portion is not less than 50%. wherein there are provided a plurality of such non-transmitting portions; and wherein said non-transmitting portions are off-set such that communicating portions are not aligned in a line along the direction.