Ink jet head unit and ink jet recording apparatus mounted with the same

An ink jet head unit comprising:

• a head having a first surface and a second surface which is opposite relative to said first surface, the first surface comprising a first nozzle array and a second nozzle array which is arranged parallel to said first nozzle array with a predetermined spacing, each of said first and second nozzle arrays having plural nozzle holes for ejecting ink;
• a plurality of flexible flat cables, each of the flat cables comprising a transmission wire for driving said head;
• and
• a plurality of connectors provided on a fixing part of said second surface of said head, said connectors being connected with said flexible flat cables, respectively, wherein said fixing part is opposite to an area between said first nozzle array and said second nozzle array in said first surface, and said flat cables extend from said head in the same direction,
• wherein each of the flat cables includes a driver, which generates an ink ejection signal for driving said head, and a heat radiation plate, wherein the driver and heat radiation plate are provided in a midway position of said respective flat cable and the locations of said drivers are shifted relative to each other.

An ink jet head unit comprising:

• a head in which a first nozzle array and a second nozzle array of which each comprises a plurality of nozzle holes for ejecting ink therefrom;
• a head base on which said head is mounted;
• and
• a plurality of flat flexible cables, each of said cables comprising a plurality of transmission wires covered with an insulation film,
• wherein one end side of each of said flat flexible cables, where said transmission wires are exposed, is fixed in a mounted part interposed between the first nozzle array and the second nozzle array, onto said head thereby to transmit an ink ejection signal for driving said head, wherein a metallic interference preventing member or a nonmetallic interference preventing member in which a metal layer is formed is arranged at least partly between said flat cables.

An ink jet head unit comprising:

• a head in which a first nozzle array and a second nozzle array of which each comprises a plurality of nozzle holes for ejecting ink therefrom;
• a head base on which said head is mounted;
• and
• a plurality of flat flexible cables, each of said flat cables comprising a plurality of transmission wires covered with an insulation film,
• wherein one end side of each of said flat flexible cables, where said transmission wires are exposed, is fixed in a mounted part interposed between the first nozzle array and the second nozzle array, onto said head thereby to transmit an ink ejection signal for driving said head,
• wherein each of the flat cables includes a driver, which generates an ink ejection signal for driving said head, and a heat radiation plate, wherein the driver and heat radiation plate are provided in a midway position of said respective flat cable, and the locations of said drivers are shifted relative to each other.