Patent ID: 8523324
Filing Date: 2013-09-03
Classification: B41J

Abstract:
1. A liquid discharge head substrate comprising: an external terminal configured to connect to an external; a first conductive layer connected to the external terminal for causing a current input from the external terminal to flow, and a diode comprising an anode and a cathode; a second conductive layer connected to the first conductive layer and one electrode of the anode and the cathode, which causes a surge current generated when a surge voltage is applied from the external terminal, to flow from the first conductive layer to the one electrode; and a third conductive layer connected to the other electrode of the anode and the cathode, which passes the surge current flowing from the one electrode to the other electrode; wherein the first conductive layer comprises a part laminating with the second conductive layer sandwiching an insulation layer and does not comprise a part laminating with the third conductive layer.