Ink jet recording head having an improved substance arrangement device

An ink jet recording device comprising:

• a recording head including a plurality of liquid discharge portions each having a discharge opening for discharging ink, and
• a substrate provided with a plurality of electrothermal transducers for generating thermal energy to be utilized for discharging the ink supplied to said liquid discharging portions and a plurality of functional devices connected electrically to said electrothermal transducers,
• wherein said plurality of functional devices are arranged in a direction different from an arrangement direction of said plurality of electrothermal transducers within a region provided with a wiring portion including common electrode wiring and selective electrode wiring for said plurality of electrothermal transducers and said plurality of functional devices, said plurality of electrothermal transducers are connected in the vicinity thereof to said common electrode wiring, and most of said wiring portion is formed at a layer lower than a layer where said electrothermal transducers are formed;
• a means for supplying ink to said head;
• and
• a means for conveying a recording medium to a recording position adjacent said recording head.

A substrate for a recording head, said substrate comprising:

• a plurality of electrothermal transducers for generating thermal energy;
• and
• a plurality of functional devices electrically connected to said electrothermal transducers in said substrate,
• wherein said plurality of functional devices are arranged in a direction different from an arrangement direction of said plurality of electrothermal transducers within a region provided with a wiring portion including common electrode wiring and selective electrode wiring for said plurality of electrothermal transducers and said plurality of functional devices, said plurality of electrothermal transducers are connected in the vicinity thereof to said common electrode wiring, and most of said wiring portion is formed at a layer lower than a layer where said electrothermal transducers are formed.

A recording head comprising:

• a liquid discharge portion having a liquid discharge opening;
• and
• a substrate provided with a plurality of electrothermal transducers for generating thermal energy, and a plurality of functional devices electrically connected to said electrothermal transducers in said substrate,
• wherein said plurality of functional devices have different characteristic curves of saturated voltage in a normal direction versus temperature corresponding to a distance from said electrothermal transducers.

An ink jet recording device comprising:

• a recording head including a liquid discharge portion having a liquid discharge opening, and
• a substrate provided with a plurality of electrothermal transducers for generating thermal energy, and a plurality of functional devices electrically connected to said electrothermal transducers in said substrate,
• wherein said plurality of functional devices have different characteristics curves of saturated voltage in a normal direction versus temperature corresponding to a distance from said electrothermal transducers;
• a means for supplying ink to said recording head;
• and
• a means for conveying a recording medium to a recording position adjacent said recording head.

A substrate for a recording head, said substrate comprising:

• a plurality of electrothermal transducers for generating thermal energy;
• and
• a plurality of functional devices electrically connected to said electrothermal transducers in said substrate,
• wherein said plurality of functional devices have different characteristic curves of saturated voltage in a normal direction versus temperature corresponding to a distance from said electrothermal transducers.