Patent ID: 6443561
Filing Date: 2002-09-03
Classification: B41J

Abstract:
A liquid discharge head comprising:discharge ports for discharging liquid which is normally liquid; electrothermal transducing elements arranged to face said discharge ports for generating thermal energy utilized for discharging liquid from said discharge ports; and a covering layer for covering said electrothermal transducing elements, residing inclusively between said electrothermal transducing elements and the liquid, wherein, for each of said discharge ports, the gap between said discharge port and the surface of said covering layer is 34 &mgr;m or less, and the thickness of said covering layer is 6,300 Ã¥ or less, and a corresponding one of said electrothermal transducing elements generates thermal energy of 0.0027 &mgr;J/&mgr;m2 or less by the application of a single driving pulse of 1.2 &mgr;s or less for creating film boiling in the liquid to discharge liquid from said discharge port, and wherein a bubble created by said film boiling communicates with the air outside.