Patent ID: 6582070
Filing Date: 2003-06-24
Classification: B41J,C09D

Abstract:
A recording unit comprising an ink housing part for housing an ink containing a coloring material and an aqueous medium, and an ink jet head part for discharging an ink droplet of the ink, wherein at least one color of the ink is a polyvalent metal salt containing ink; the ink jet head part has a configuration comprised of a substrate having on a base body, a heat-generating resistor member forming a heat-generating part, an electrode wire electrically connected to the heat-generating resistor member, and a cavitation resistant film provided on the heat-generating resistor member and the electrode wire via an insulating protection layer, and a liquid flow path communicating with a discharge port for discharging an ink droplet provided corresponding to the heat-generating part; and the cavitation resistant film comprises a first layer comprised of an amorphous alloy containing Ta and a second layer comprised of an amorphous body of an amorphous alloy which is richer in Ta than the amorphous alloy containing Ta or a passive matter of the amorphous body provided on the first layer.