Patent ID: 6796643
Filing Date: 2004-09-28
Classification: B41J

Abstract:
An ink jet cartridge comprising:a first chamber for accommodating a negative pressure producing material and provided with an air communication part for communication with ambient air and an ink supply opening for supplying an ink to an ink jet head; a second chamber substantially closed except for a communication part for communication with said first chamber disposed at a position away from said air communication part, wherein said second chamber directly accommodates ink to be supplied to said first chamber; wherein said communication part is formed between a partition wall for defining said first and second chambers and an indside surface of said ink jet cartridge, and said ink supply opening permits an insertion of an ink supply pipe for supplying the ink to the ink jet head, and wherein said negative pressure producing material is capable of being compressed toward said communication part by insertion of the supply pipe into the ink supply opening; and wherein said ink supply opening is at a lower side in use.