| 摘要 |
A liquid discharge head comprises discharge ports for discharging liquid; electrothermal transducing elements arranged to face the discharge ports; and a layer covering the electrothermal transducing elements. The gap between the discharge ports and the covering layer is 34 mum or less, and the thickness of the covering layer is 6,300 Å or less. One of the electrothermal transducing elements generates thermal energy of 0.0027 muJ/mum2 or less by the application of a single driving pulse of 1.2 mus or less to produce film boiling to discharge liquid from the corresponding discharge port. Fluctuation of liquid bubbling on the surface of the electrothermal transducing element is reduced, and since the resultant meniscus retraction becomes smaller upon discharge, liquid can return to the surface of the electrothermal transducing element quickly and the meniscus faces the discharge port, improving displacement accuracy of liquid droplets on a printing medium even when driving is executed at high frequency.
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