Patent ID: 6474788
Filing Date: 2002-11-05
Classification: B41J

Abstract:
A substrate for an ink jet head comprising a plurality of discharge ports for discharging liquid, a plurality of liquid flow paths communicated with said plurality of discharge ports, and first and second heat generating means arranged serially in each said liquid flow path of said plurality of liquid flow paths for generating thermal energy utilized for discharging liquid in said liquid flow path from said discharge ports, and forming said first and second heat generating means on the substrate, whereinsaid first and second heat generating means are driven at driving frequencies of 4 kHz or more, and said first heat generating means are arranged in parallel in the direction perpendicular to the flow path direction of said liquid flow path, at the same time, being structured with a plurality of heat generating resistive members electrically connected in series, and said second heat generating means is structured with at least one heat generating resistive member.