Patent ID: 7226153

Claim:
An ink cartridge comprising: an ink-holding portion including a rigid indented surface portion and a flexible film, the indented surface portion having an open side at one side thereof, the flexible film covering the open side of the indented surface portion, ink being accommodated between the indented surface portion and the flexible film; a rigid upper surface positioned opposite from the indented surface portion with respect to the flexible film, the upper surface being formed with a substantial semispherical shape that bulges in a direction away from the indented surface portion; a main case including the indented surface portion of the ink-holding portion and attached with the flexible film so that the open side of the indented surface portion is covered; and a lid provided as a separate member from the main case and including the upper surface, the upper surface having a curved portion at a position that confronts the indented surface portion with the flexible film located therebetween, the curved portion being curved in the substantial semispherical shape in a direction extending away from the indented surface portion; wherein: the indented surface portion of the main case is formed from a wall that is curved in a substantial semispherical shape in a direction away from the curved portion of the lid; the main case has a peripheral wall that extends from an upper edge thereof in a depthwise direction of the ink-holding portion to a lower edge thereof to encompass the ink-holding portion, the lower edge of the peripheral wall substantially defining an outer peripheral edge portion of a lower surface of the main case; and the lid has an outer peripheral portion that confronts the peripheral wall and that is coupled with the upper edge of the peripheral wall.