Patent ID: 7213913

Claim:
An ink cartridge having a differential pressure regulating valve mechanism disposed in a container and interposed between an ink storage chamber and an ink supply port, the cartridge comprising: a valve storage chamber for storing the valve mechanism, the valve storage chamber having an opening in a front surface of the container; a lid member located downstream of the valve storage chamber and having a first ink flow groove for defining a part of an ink flow path, the lid member closing the opening of the valve storage chamber; a wall having a second ink flow groove, the first ink flow groove being located upstream of and leading to the second ink flow groove; a film attached to the front surface of the container and a surface of the lid member, the film defining the part of the ink flow path in cooperation with the first ink flow groove of the lid member and the second ink flow groove of the wall, and fixing the lid member in place with respect to the front surface of the container.