| 摘要 |
The liquid ejection head includes: a nozzle plate formed with a nozzle through which a droplet of liquid is ejected; a liquid chamber which contains the liquid and is connected to the nozzle; and a pressure generating device which causes the liquid chamber to contract and expand, wherein: the nozzle has a first portion having a first diameter on a side from which the liquid is ejected, and a second portion having a second diameter on a side from which the liquid is supplied from the liquid chamber, the second diameter being not less than 2.5 times and not more than 5 times the first diameter; a non-wetting surface is formed on the nozzle plate at an inner face of the first portion of the nozzle and a face that contacts an outside air; a wetting surface is formed on an inner face of the nozzle other than the inner face of the first portion; and when starting ejection of the droplet of the liquid from the nozzle, force applied to the liquid inside the liquid chamber by the pressure generating device acts only in a direction which contracts volume inside the liquid chamber.
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