Patent ID: 8157357
Filing Date: 2012-04-17
Classification: B41J

Abstract:
1. A circuit substrate for use in a liquid discharging apparatus comprising: a pair of electrodes disposed in opposition to each other to form a gap between the electrodes; and a resistor layer arranged at least between the electrodes, wherein a circuit includes a plurality of heat generating elements generating heat by energizing between the electrodes, a first wiring layer and a second wiring layer arranged over the first layer to energize between the pair of electrodes of each of the heat generating elements, wherein the first wiring layer is formed from metal material containing at least a main ingredient element of the substrate, and wherein the first wiring layer is electrically connected directly to a diffusion region arranged in the substrate and not through a barrier metal, the second wiring layer is electrically connected to the first wiring layer through a metal film for suppressing a diffusion of the main ingredient element of the substrate contained in the first wiring layer, and the resistor layer is arranged over the second wiring layer.