Patent ID: 7416279
Filing Date: 2008-08-26
Classification: B41J

Abstract:
1. A connection structure for connecting an inkjet recording head which includes an actuator on which a plurality of connecting terminals to apply therethrough a drive voltage to each of a plurality of channels formed in the inkjet recording head for ejection of an ink droplet onto a recording medium, to a circuit element through which control signals for controlling an operation of the inkjet recording head are supplied, the circuit element being disposed on a wiring board having a plurality of bump electrodes formed thereon, and the connecting terminals being superposed on and connected to the bump electrodes, the connection structure comprising: each of the connecting terminals comprising a surface electrode and an external electrode which is formed directly on the surface electrode and which has a thickness larger than a thickness of the surface electrode; the surface electrode and the external electrode of each of the connecting terminals are both bonded to a corresponding one of the bump electrodes; and at least a part of the surface electrode having a width larger than the other part thereof to constitute a wide part of the surface electrode, and the external electrode being disposed such that a margin of the external electrode is positioned on an inner side of a periphery of the wide part.