Patent ID: 8070267
Filing Date: 2011-12-06
Classification: B41J

Abstract:
1. An ink jet recording element substrate comprising: a substrate; an ejection outlet array for ejecting ink; a heat generating element array comprising a plurality of heat generating elements for generating ejection energy for ejecting the ink from said ejection outlet array; a protecting film, comprising protecting portions, for protecting said heat generating element array; a common line, disposed along a side of said heat generating element array, for supplying electric power for driving the heat generating elements, wherein said common line is divided into at least two portions by a line perpendicular to said heat generating element array; a testing electrode for testing a function of said protecting film; and an externally connecting electrode, disposed at an end of said substrate, for externally supplying electric power to said common line; wherein said ink jet recording element substrate further comprises, in an area between the portions of said common line, a connecting line for electrically connecting the protecting portions of said protecting film disposed to sandwich said common line and a lead line for electrically connecting said protective film and said testing electrode.