| 摘要 |
1. An ink cartridge connectable to an ink jet recording head of an ink jet recording apparatus, comprising: a first chamber (4) containing negative pressure producing material (3) and having an ink outlet (2) connectable to the ink jet head to supply ink from the cartridge to the ink jet head and an air vent (10) for allowing air into the cartridge; and a second chamber (6) having a communication port (8) and inner surfaces, said communication port (8) being disposed at a lower part of said cartridge when the cartridge is in use and said inner surfaces intersecting at an intersection portion, said second chamber (6) communicating with the first chamber (4) by means of said communication port (8) and providing an ink reservoir for said first chamber, wherein said intersection portion is rounded. See p.8, l's 16-24: lessens capilary force in second chamber (6) compared to the sharp corners in the first chamber (4). 2. A cartridge according to claim 1, wherein said intersection portion extends substantially vertically while the cartridge is in use. 3. A cartridge according to claim 1, further comprising a rib extending in a direction crossing with an ink supply direction from said second chamber to said first chamber, said rib being disposed at a bottom to said second chamber while said cartridge in use.
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