Patent ID: 7172273
Filing Date: 2007-02-06
Classification: B41J

Abstract:
1. An ink tank having a supply outlet for supplying ink, a reserving chamber storing ink to be supplied via said supply outlet, a pressure regulator valve located inside a passage connecting said reserving chamber with said supply outlet to operate on the basis of a pressure difference between the reserving chamber side and the supply outlet side, and an air vent formed to communicate with said reserving chamber through a case member from which said ink tank is composed, said ink tank comprising: a concave portion formed in one surface of said ink tank for forming a passage of said pressure regulator valve; and a groove one end of which connects with said air vent, said groove being formed in and along a surface on which said air vent is formed and said one surface of said ink tank, wherein film attached to said surface of said ink tank and to said one surface of said ink tank covers said concave portion, said air vent, and said groove, except other end of said groove, together, so that said passage of said pressure regulator valve and an air communication passage are formed; and wherein said other end of said groove forming said air communication passage is located at a surface at which said supply outlet is located.