Patent ID: 6164772
Filing Date: 2000-12-26
Classification: B41J

Abstract:
An ink jet cartridge as a mechanism containing an ink for ejection from an ink jet head comprising:a negative pressure producing material;a first chamber for accommodating said negative pressure producing material;a second chamber in communication with said first chamber through a communication part, which is formed between a partition wall for defining said first and second chambers and along the bottom surface of said first chamber;said first chamber being formed with an opening for receiving an ink supply pipe for supplying ink into an ink jet head; and having an air communication outlet formed in a position higher than that of said opening for making communication with ambient air;said first and second chambers enclosing ink therein;wherein said ink contains a surfactant in an amount not exceeding a critical micelle concentration in the ink, but exceeding a critical micelle concentration in purified water, and wherein a gas-liquid interface in said negative pressure producing material within said first chamber of said ink jet cartridge is stabilized against environmental changes including changes in atmospheric pressure and temperature.