Patent ID: 8154575
Filing Date: 2012-04-10
Classification: B41J,H05B,Y10T

Abstract:
1. A heating resistor element, comprising: an insulating substrate; a heat accumulating layer bonded to a surface of the insulating substrate; and a heating resistor provided on the heat accumulating layer, wherein: on at least one of bonded surfaces between the insulating substrate and the heat accumulating layer, at least one of the insulating substrate and the heat accumulating layer includes a concave portion in a region opposed to the heating resistor that defines a hollow portion; and the concave portion has a rough surface and a radius of curvature of 10 μm or more at each corner thereof, and an aperture having a length (L) and a width (W), where the radius of curvature is less than or equal to one half (L) or to one half (W).