Patent ID: 6042221
Filing Date: 2000-03-28
Classification: B41J

Abstract:
An ink-jet recording head comprising an ink flow path having a discharge opening for discharging an ink, an electrothermal transducer provided corresponding to the ink flow path and comprising a lower layer for heat accumulation, a resistance layer provided on the lower layer, and a pair of wiring electrodes provided on the resistance layer for applying an electric signal to the resistance layer, a portion of the resistance layer being disposed between the wiring electrodes and forming a heat-generating portion; anda protective layer provided on the electrothermal transducer for protecting the electrothermal transducer, the protective layer having on the heat-generating portion a thin portion of a thickness smaller than the thickness of a thick portion which is an other portion of the protective layer, wherein the heat-generating portion has a high temperature section having a pair of end portions and a pair of low temperature sections each provided contiguous to and in contact with an associated said end portion of the high temperature section, the high temperature section and the pair of low temperature sections together having a continuous flat surface, wherein the thin portion of the protective layer is positioned on the high temperature section, and wherein a boundary portion of the protective layer at which the thin portion is continuous to the other portion to vary the thickness is positioned on the low temperature section.