Substrate for use of ink jet head, ink jet head, ink jet cartridge, and ink jet recording apparatus

A substrate for an ink jet head constituting 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 for generating thermal energy utilized for discharging liquid in each said liquid flow path from said discharge ports, wherein

• said substrate for use of an ink jet head is provided with a common wiring layer formed on said substrate to be arranged on said substrate side of said first and second heat generating means;
• an insulating layer formed on the surface of said common wiring layer to be arranged as the lower layer of said first and second heat generating means;
• a first through hole formed on said insulating layer between said first and second heat generating means for electrically connecting said first and second heat generating means with said common wiring layer;
• a first individual wiring formed on the surface of said insulating layer to be electrically connected with said first heat generating means;
• a second individual wiring formed on the surface of said insulating layer to be electrically connected with said second heat generating means, and at the same time, said first and second heat generating means are driven at driving frequencies of 4 kHz or more, and said first heat generating means is 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.