Patent ID: 6382772
Filing Date: 2002-05-07
Classification: B41J

Abstract:
An ink jet recording apparatus for recording images with gradation, comprising:an ink jet head, including an ink ejection outlet for ejecting an ink, an ink flow path in fluid communication with said ink ejection outlet, a first resistor, provided in said ink flow path, for generating thermal energy contributable to ejecting the ink, said first resistor having a heat generating center which is separated from said ejection outlet by a first distance, a second resistor, provided in said ink flow path, for generating thermal energy contributable to ejecting the ink, said second resistor having a heat generating center which is separated from said ejection outlet by a second distance which is larger than the first distance; and control means for controlling said first and said second heat generating resistors, said controlling means causing said first heat generating resistor alone to eject the ink through said ink ejection outlet with a first volume, and causing both of said first and said second resistors to eject the ink through said ink ejection outlet with a second volume which is greater than the first volume.