Patent ID: 6655542
Filing Date: 2003-12-02
Classification: B41J

Abstract:
An ink tank comprising:an inner wall forming a liquid containing portion for storing liquid; an outer wall, having inner surfaces whose shapes are substantially the same as those of outer surfaces of the inner wall, comprising at least one atmospheric-air communicating portion for introducing atmospheric air into a space between the inner wall and the inner surfaces of the outer wall; and a liquid feeding port for feeding liquid in the liquid containing portion to the outside, wherein the inner wall is separable from the outer wall as the liquid is being guided out from the liquid feeding port, the ink tank further comprising: a first region in which the inner and outer walls are bonded to each other and are separable from each other by an external force; and a second region, next to the first region, in which the inner and outer walls are bonded to each other and a larger external force is needed to separate the inner wall from the outer wall than in the first region, wherein, as the liquid is being guided out, the inner wall separates from the outer wall first in the first region and then in the second region.