Patent ID: 7992967

Claim:
A liquid drop ejection head unit, comprising: at least two lines of at least two nozzles formed on a nozzle plate; at least two lines of at least two drive elements configured to generate energy for ejecting liquid drop through at least two nozzles; at least two sheets of flexible printed circuit boards configured to input signals to the at least two drive elements, each of said at least two sheets of flexible printed circuit boards including input and output terminals, said input terminal taking in a signal, said output terminal outputting the signal to one of the at least two drive elements; and a wiring board configured to connect to the input terminals of the at least two sheets of flexible printed circuit boards and configured to transfer the signal to the input terminal; wherein said wiring board is arranged in parallel to the nozzle line within a width of nozzle plate, and wherein said at least two sheets of the flexible printed boards are arranged opposing to each other via the wiring board, and wherein said input terminals respectively arranged on the at least two sheet of the flexible printed boards are positioned not to face each other.