Patent ID: 7530668

Claim:
A liquid ejection head comprising: a liquid ejection member; a nozzle located therein; a depression formed around the nozzle on a surface of the liquid ejection member; a liquid chamber associated and in fluid communication with the nozzle and configured to contain liquid; and an energy generating element associated with the liquid chamber and configured to generate energy to eject the liquid contained in the liquid chamber from the nozzle as a liquid droplet; wherein, the nozzle has an opening with a width D, the distance between the surface of the energy generating element and a liquid droplet ejection surface is H, the ratio D/H is greater than or equal to 0.9 μm and effectively extends the deflection width of the effected ink to a value greater than or equal to 120 μm, an opening of the depression has a width greater than the width D of the opening of the nozzle, and the nozzle is positioned at the bottom of the depression, and the interior angle of the bottom corner of the depression is greater than 90 degrees.