Patent ID: 8911062

Claim:
A liquid-jet head comprising: a channel plate forming an individual liquid chamber in communication with nozzles configured to eject liquid drops; a wall surface member forming al surface of the individual liquid chamber; and a drive unit disposed on the wall surface member side and configured to generate a pressure applied to a drive region inside the individual liquid chamber, wherein a fluid resistance part is formed by disposing an island part in a liquid supply channel configured to supply a liquid to the individual liquid channel, and the island part includes a gradient part on the channel plate side, at least a part of the gradient part being formed such that the part of the gradient part faces the drive region inside the individual liquid chamber, wherein the wall surface member is a diaphragm member and the drive unit is an electromechanical transducer element configured to displace an oscillating region of the diaphragm member, and wherein at least a part of the gradient part is configured to face a coupling part between the electromechanical transducer element and the diaphragm member.