Flexible circuit sheet, continuous tape, and ink jet head

A continuous flexible tape extending in a second direction, comprising:

• a plurality of flexible circuit sheets to be electrically connected to a plurality of electric devices, each electric device having a first row of electric terminals extending in a first direction which is perpendicular to the second direction and a second row of electric terminals extending parallel to the first row of electric terminals, and another flexible circuit sheet being connected to each flexible circuit sheet along the second direction,
• wherein each flexible circuit sheet comprises:
• a base sheet;
• a first row of lands to be electrically connected to the first row of electric terminals, wherein the first row of lands is formed on the base sheet and extends in the first direction;
• and
• a second row of lands to be electrically connected to the second row of electric terminals, wherein the second row of lands is formed on the base sheet and extends parallel to the first row of lands,
• wherein a surface area of each land of the first row of lands is greater than a surface area of each land of the second row of lands.

An ink jet head comprising:

• an ink jet head body having a plurality of pressure chambers, each pressure chamber being connected to one corresponding nozzle;
• an actuator unit fixed to the ink jet head body, wherein the actuator unit has a plurality of actuators and a plurality of electric terminals, each electric terminal being connected to one corresponding actuator and each actuator being coupled with one corresponding pressure chamber, wherein a pressure within the corresponding pressure chamber can be increased when the actuator is activated, and wherein the electric terminals are classified into a first row of electric terminals and a second row of electric terminals, the second row of electric terminals extending parallel to the first row of electric terminals;
• and
• a flexible circuit sheet electrically connected to the actuator unit, the flexible circuit sheet comprising:
• a base sheet;
• a first row of lands electrically connected to the first row of electric terminals, the first row of lands being formed on the base sheet;
• and
• a second row of lands electrically connected to the second row of electric terminals, the second row of lands being formed on the base sheet;
• wherein a surface area of each land of the first row of lands is greater than a surface area of each land of the second row of lands.

A method of producing an ink jet head, the ink jet head comprising:

• an actuator unit having a plurality of electric terminals classified into a first row of electric terminals extending in a first direction and a second row of electric terminals extending in the first direction, wherein the second row of electric terminals is separated from the fist row of electric terminals in a second direction which is perpendicular to the first direction;
• and
• a flexible circuit sheet electrically connected to the actuator unit, the flexible circuit sheet comprising a first row of lands electrically connected to the first row of electric terminals and a second row of lands electrically connected to the second row of electric terminals;
• the method comprising:
• producing a continuous tape extending in the second direction, wherein the continuous tape comprises a plurality of flexible circuit sheets, each flexible circuit sheet comprising a first row of lands to be electrically connected to the first row of electric terminals and a second row of lands to be electrically connected to the second row of electric terminals, wherein the first row of lands extend in the first direction and the second row of lands extend parallel to the first row of lands, wherein a surface area of each land of the first row of lands is greater than a surface area of each land of the second row of lands;
• applying electrically conductive material to each land by moving the continuous tape along the second direction across a bath that contains fluid of electrically conductive material, wherein the second row of lands is soaked in a bath that contains fluid of electrically conductive material before the first row of lands;
• cutting the continuous tape into the plurality of flexible circuit sheets;
• and
• attaching the first row of lands to the first row of electric terminals and attaching the second row of lands to the second row of electric terminals.