Head substrate, printhead, head cartridge, and printing apparatus

A rectangular head substrate comprising:

• a plurality of ink supply ports, each of which has a long hole shape elongated in a first direction;
• a plurality of printing elements arrayed along the first direction on both sides of each of said plurality of ink supply ports;
• a plurality of first driving elements, arrayed along the first direction at positions spaced apart further away from a corresponding one of said plurality of ink supply ports than corresponding ones of said plurality of printing elements, for driving said plurality of printing elements;
• a plurality of fuse ROMs for storing information, arranged at both ends of extensions from each one of said plurality of ink supply ports in the first direction;
• a plurality of second driving elements for driving said plurality of fuse ROMs;
• shared signal lines used for driving said plurality of first driving elements and said plurality of second driving elements, associated with each of said plurality of ink supply ports;
• power supply circuits for supplying power to said plurality of first driving elements and said plurality of second driving elements, associated with each of said plurality of ink supply ports;
• serial-parallel conversion circuits, connected to at least part of said shared signal lines, arranged at one end of the extensions in the first direction, associated with each of said plurality of ink supply ports;
• decoders, connected to at least part of said shared signal lines, arranged at the other end of the extensions in the first direction, associated with each of said plurality of ink supply ports;
• and
• input pads, connected to either said serial-parallel conversion circuits or said power supply circuits, for receiving signals inputted from outside of said head substrate,
• wherein said first driving elements and said second driving elements are arrayed along the first direction on both sides of the extensions from each of said plurality of ink supply ports, forming continuous arrays,
• said plurality of fuse ROMs are arranged at intermediate areas between each one of said plurality of ink supply ports and either said serial-parallel conversion circuits or said power supply circuits,
• each of said serial-parallel conversion circuits is common to corresponding ones of the arrayed first and second driving elements at both sides of a corresponding one of said plurality of ink supply ports,
• said decoders are respectively arranged along corresponding ones of the continuous arrays,
• each of said power supply circuits is arranged between said decoders, and is common to corresponding ones of the arrayed first and second driving elements arranged at both sides of a corresponding one of said plurality of ink supply ports, and
• said input pads are arranged at sides of said rectangular head substrate in a direction perpendicular to the first direction.

A rectangular head substrate comprising:

• a plurality of ink supply ports, each of which has a long hole shape elongated in a first direction;
• a plurality of printing elements arrayed along the first direction on both sides of each of said plurality of ink supply ports;
• a plurality of first driving elements, arrayed along the first direction at positions spaced apart further away from a corresponding one of said plurality of ink supply ports than corresponding ones of said plurality of printing elements, for driving said plurality of printing elements;
• a plurality of fuse ROMs for storing information, arranged at both ends of extensions from each one of said plurality of ink supply ports in the first direction;
• a plurality of second driving elements for driving said plurality of fuse ROMs;
• first shared signal lines used for driving a first part of said plurality of first and second driving elements, and which are arranged along the first direction at one side of each of said plurality of ink supply ports;
• second shared signal lines used for driving a second part of said plurality of first and second driving elements, and which are arranged along the first direction at the other side of each of said plurality of ink supply ports;
• first power supply circuits for supplying power to the first part of said plurality of first and second driving elements driven via said first shared signal lines, one of said first power supply circuits associated with each of said plurality of ink supply ports;
• second power supply circuits for supplying power to the second part of said plurality of first and second driving elements driven via said second shared signal lines, one of said second power supply circuits associated with each of said plurality of ink supply ports;
• first serial-parallel conversion circuits, connected to at least part of said first shared signal lines, arranged at the same side as that where the first part of said plurality of first and second driving elements are arranged, one of said first serial-parallel conversion circuits associated with each of said plurality of ink supply ports;
• second serial-parallel conversion circuits, connected to at least part of said second shared signal lines, arranged at the same side as that where the second part of said plurality of first and second driving elements are arranged, one of said second serial-parallel conversion circuits associated with each of said plurality of ink supply ports;
• first decoders arranged at areas between said first serial-parallel conversion circuits and the first part of said plurality of first and second driving elements, one of said first decoders associated with each of said plurality of ink supply ports;
• second decoders arranged at areas between said second serial-parallel conversion circuits and the second part of said plurality of first and second driving elements, one of said second decoders associated with each of said plurality of ink supply ports;
• and
• input pads, connected to either said first and second serial-parallel conversion circuits or said first and second power supply circuits, for receiving signals inputted from outside of said head substrate, said input pads associated with each of said plurality of ink supply ports,
• wherein the first part of said plurality of first and second driving elements forms a first continuous away along the first direction, and the first continuous away is arranged in an area between said first power supply circuit, said first decoder and said first serial-parallel conversion circuit corresponding to each of said plurality of ink supply ports,
• the second part of said plurality of first and second driving elements forms a second continuous away along the first direction, and the second continuous away is arranged in an area between said second power supply circuit, said second decoder and said second serial-parallel conversion circuit corresponding to each of said plurality of ink supply ports,
• a first part of said plurality of fuse ROMs, which corresponds to the first part of said plurality of first and second driving elements, is arranged in an area surrounded by each one of said plurality of ink supply ports, the first part of corresponding ones of said plurality of first and second driving elements, a corresponding one of said first serial-parallel conversion circuit, and a corresponding one of said first power supply circuit,
• a second part of said plurality of fuse ROMs, which corresponds to the second part of said plurality of first and second driving elements, is arranged in an area surrounded by each one of said plurality of ink supply ports, the second part of corresponding ones of said plurality of first and second driving elements, a corresponding one of said second serial-parallel conversion circuit, and a corresponding one of said second power supply circuit,
• said input pads are arranged at sides of said rectangular head substrate in a direction perpendicular to the first direction, and
• said first and second power supply circuits, said first and second serial-parallel conversion circuits, said first and second decoders, and said first and second parts of said plurality of fuse ROMs are approximately point-symmetrically arranged with respect to each of said plurality of ink supply ports.