Ink jet head and head unit

A head unit comprising:

• an ink jet head including:
• an actuator including a plurality of terminals arranged in arrays on a surface of the actuator, for applying pressure corresponding to a plurality of energy generators for ejecting ink;
• a wiring material coupled with a base made of a flexible resin film on which a plurality of lands are arranged in arrays corresponding to the plurality of terminals, the wiring material of which one end is superimposed on the surface of the actuator, and which extended to a direction parallel to the surface of the actuator as an extended portion;
• and a drive circuit for driving the actuator;
• and
• a box-shaped head holder including:
• a bottom wall;
• and a slit;
• wherein the terminals and the lands are bonded by thermocompression;
• wherein the wiring material includes a small width portion, of which a width in a direction perpendicular to an extended direction of the wiring material is smaller than that of the one end superimposed on the actuator, arranged on the extended portion;
• wherein the drive circuit is mounted on the extended portion;
• wherein wiring patterns are formed on the wiring material, for connecting the drive circuit and the plurality of lands;
• wherein the ink jet head is installed under the bottom wall of the box-shaped head holder;
• wherein the wiring material is passed through the slit opened in the bottom wall;
• wherein the small width portion is a notch formed in a vicinity of the one end superimposed on the actuator;
• wherein the notch is provided in each end in the width direction of the wiring material;
• and
• wherein the notch is provided between portions of the wiring material which have widths larger than the width of the small width portion in the direction perpendicular to the extended direction of the wiring material.

An ink jet head comprising:

• a cavity portion which opens a plurality of nozzles onto an exterior and has an ink channel in an interior;
• an actuator which selectively applies an ejection pressure to ink inside the cavity portion;
• a flexible flat cable which transmits a drive signal being bonded to the actuator;
• wherein the actuator includes a plurality of electrodes arranged in a flat formation corresponding to the plurality of nozzles;
• wherein the flexible flat cable includes a flat portion superimposed on the plurality of electrodes of the actuator and electrically bonded, and a flexible portion extended from one end of the flat portion;
• wherein the flexible portion includes removed portions removing both side edges parallel to an extended direction of the flexible portion;
• wherein the removed portions are formed in such a way that a width dimension of a direction perpendicular to the extended direction is smaller than that of the flat portion;
• wherein a rigid plate is affixed to a rear surface of a side opposite to a side on which the flexible flat material is bonded to the plurality of electrodes, and covers an approximate whole surface of the flat portion;
• wherein a rigidity of the rigid plate is higher than that of the flexible flat cable;
• wherein an end edge of the rigid plate, which is the extended side of the flexible portion, is cut into a side opposite to the extended direction of the flexible portion as a notch;
• wherein a width of the notch is approximately equivalent to that of a narrow portion of the flexible portion;
• and
• wherein the rigid plate includes two protrusions protruding toward the removed portions of the flexile portion, in both ends of a direction perpendicular to the extended direction of the flexible portion.