Ink cartridge and method of regulating fluid flow

摘要

An ink supply port (5) is in fluid communication with an ink storage chamber through an ink flow path. A negative pressure generating mechanism (30) has a circular valve (20) with flat surface that is moved to open and close the ink flow path, when the pressure in the ink supply port decreases and increases with respect a predetermined value. Independent claims are also included for the following: (1) fluid flow controller; and (2) method of regulating ink flow from ink cartridge.