Ink jet head, connecting sheet, composite sheet, and method of manufacturing ink jet head and composite sheet

A connecting sheet for an ink jet head, the ink jet head comprising,

• a main body comprising a plurality of sets, each set including an input terminal, an actuator electrically connected to the input terminal, a pressure chamber coupled with the actuator, and a nozzle communicated with the pressure chamber, wherein when a voltage is applied to the actuator in a selected set via the input terminal in the selected set, ink within the pressure chamber in the selected set receives pressure to jet from the nozzle in the selected set, and
• a wired sheet comprising a plurality of sets, each set including a signal line and an output terminal connected to the signal line,
• the connecting sheet comprising:
• an insulating sheet made of insulating material;
• and
• a plurality of sets, each set including a first terminal formed on a first face of the insulating sheet and a second terminal formed on a second face of the insulating sheet and electrically connected to the first terminal,
• wherein each set of the connecting sheet uniquely corresponds to one of the sets of the main body and to one of the sets of the wired sheet, and the connecting sheet is to be located between the main body and the wired sheet, to be fixed to the main body such that the first terminal in each set of the connecting sheet is to be electrically connected to the input terminal in the corresponding set of the main body, and to be fixed to the wired sheet such that the second terminal in each set of the connecting sheet is to be electrically connected to the output terminal in the corresponding set of the wired sheet.

A composite sheet for an ink jet head comprising a main body comprising a plurality of sets, each set including an input terminal, an actuator electrically connected to the input terminal, a pressure chamber coupled with the actuator, and a nozzle communicated with the pressure chamber, wherein when a voltage is applied to the actuator in a selected set via the input terminal in the selected set, ink within the pressure chamber in the selected set receives pressure to jet from the nozzle in the selected set,

• the composite sheet comprising:
• a wired sheet comprising a plurality of sets, each set including a signal line and an output terminal connected to the signal line;
• and
• a connecting sheet comprising an insulating sheet and a plurality of sets, each set including a first terminal formed on a first face of the insulating sheet and a second terminal formed on a second face of the insulating sheet and electrically connected to the first terminal,
• wherein each set of the connecting sheet uniquely corresponds to one of the sets of the main body and to one of the sets of the wired sheet, and the connecting sheet is fixed to the wired sheet such that the second terminal in each set of the connecting sheet is electrically connected to the output terminal in the corresponding set of the wired sheet, and
• wherein the first terminal in each set of the connecting sheet is to be electrically connected to the input terminal in the corresponding set of the main body.

A method of manufacturing an ink jet head comprising:

• a step of manufacturing a main body, the main body comprising a plurality of sets, each set including an input terminal, an actuator electrically connected to the input terminal, a pressure chamber coupled with the actuator, and a nozzle communicated with the pressure chamber, wherein when a voltage is applied to the actuator in a selected set via the input terminal in the selected set, ink within the pressure chamber in the selected set receives pressure to jet from the nozzle in the selected set;
• a step of manufacturing a wired sheet, the wired sheet comprising a plurality of sets, each set including a signal line and an output terminal connected to the signal line;
• a step of manufacturing a connecting sheet, the connecting sheet comprising an insulating sheet and a plurality of sets, each set including a first terminal formed on a first face of the insulating sheet and a second terminal formed on a second face of the insulating sheet and electrically connected to the first terminal, wherein each set of the connecting sheet uniquely corresponds to one of the sets of the main body and to one of the sets of the wired sheet;
• a step of connecting the first terminal in each set of the connecting sheet to the input terminal in the corresponding set of the main body;
• and
• a step of connecting the second terminal in each set of the connecting sheet to the output terminal in the corresponding set of the wired sheet.

A method of manufacturing a composite sheet, comprising:

• a step of manufacturing a wired sheet, the wired sheet comprising a plurality of sets, each set including a signal line and an output terminal connected to the signal line;
• a step of manufacturing a connecting sheet, the connecting sheet comprising an insulating sheet and a plurality of sets, each set including a first terminal formed on a first face of the insulating sheet and a second terminal formed on a second face of the insulating sheet and electrically connected to the first terminal, wherein each set of the connecting sheet uniquely corresponds to one of the sets of the wired sheet;
• a step of connecting the second terminal in each set of the connecting sheet to the output terminal in the corresponding set of the wired sheet;
• and
• a step of filling at least a part of a gap between the wired sheet and the connecting sheet with an insulating material.