Patent ID: 6402311
Filing Date: 2002-06-11
Classification: B41J

Abstract:
An ink jet recording head comprising:a plurality of discharge ports for discharging ink droplets; a plurality of ink flow paths communicated with the respective discharge ports; a common liquid chamber communicated with said ink flow paths and adapted to hold ink to be introduced into said ink flow paths; electrothermal converting portions disposed in said ink flow paths and adapted to generate heat for bubbling the ink; and bubble trapping portions disposed at communicating portion between said ink flow paths and said common liquid chamber and including stepped structures each having a cross-sectional area smaller than a main cross-sectional area of said common liquid chamber and greater than a cross-sectional area of the corresponding ink flow path in a direction perpendicular to an ink introducing direction; and wherein each of said ink flow paths is provided with an inclined portion located between an upstream end of said electrothermal converting portion and the communicating portion of said ink flow path with said common liquid chamber in the ink introducing direction and having a cross-sectional area, in the direction perpendicular to the ink introducing direction, gradually increasing toward the upstream bubble trapping portion, and a surface extended from said inclined portion intersects with a ceiling surface of said bubble trapping portion.