Patent ID: 6045218
Filing Date: 2000-04-04
Classification: B41J

Abstract:
An ink cartridge connectable to an ink jet recording head of an ink jet recording apparatus, said ink cartridge being generally formed by a front wall, a back wall, a top wall, a bottom wall and two side walls providing inner surfaces of said ink cartridge, said ink cartridge comprising:a first chamber containing negative pressure producing material, said first chamber having an ink outlet connectable to the ink jet head to supply ink from the ink cartridge to the ink jet head and an air vent for allowing air into the ink cartridge; anda second chamber having a communication port and an interior bounded by at least some of the inner surfaces, said communication port being disposed adjacent to said bottom wall, said second chamber communicating with the first chamber through said communication port and providing an ink reservoir for said first chamber,wherein inner corner portions are formed in said second chamber by intersections of said side walls and said back wall, andwherein the inner corner portions that extend toward said bottom wall are rounded.