Liquid ejection head, ink cartridge, and image forming apparatus

A liquid ejection head comprising:

• three or more driving element rows in which plural driving elements that generate energy for ejecting a liquid droplet from a nozzle are arranged side by side;
• a wiring board arranged on a backside of a liquid droplet ejection surface of a nozzle plate in which the nozzle is formed;
• and
• at least three or more rows of flexible printed circuits that are provided to correspond to the respective driving element rows and have output terminal parts connected to the plural driving elements and input terminal parts connected to the wiring board, the input terminal parts being drawn to a side of the wiring board;
• wherein
• the input terminal parts of the flexible printed circuits are folded and connected to the wiring board, the input terminal parts of the flexible printed circuits being positioned outside from among the three or more rows of the flexible printed circuits being folded in a direction where the flexible printed circuits are arranged and connected to the wiring board,
• wherein the input terminal parts of the flexible printed circuits are provided parallel to the output terminal parts, and
• a length of the input terminal parts is half or less of a length of the output terminal parts in a direction of the driving element rows.

A liquid ejection head comprising:

• at least two driving element rows in which plural driving elements that generate energy for ejecting a liquid droplet from a nozzle are arranged side by side;
• a wiring board arranged on a backside of a liquid droplet ejection surface of a nozzle plate in which the nozzle is formed;
• and
• a sheet of flexible printed circuit that is provided to correspond to the driving element rows and has output terminal parts connected to the plural driving elements and input terminal parts connected to the wiring board;
• wherein
• the flexible printed circuit has first and second input terminal parts,
• at least parts of wiring areas continuing to the first and second input terminal parts face each other, and
• the first and second input terminal parts are folded in a direction where at least the parts of the wiring areas continuing to the first and second input terminal parts face each other and are connected to the wiring board at a surface parallel to the nozzle plate, the first and second input terminal parts being arranged at positions where the first and second input terminal parts do not face each other in the direction where at least the parts of the wiring areas continuing to the first and second input terminal parts face each other.