Patent ID: 8430477

Claim:
A liquid injection head comprising: a nozzle body having a row of nozzle, holes; a plurality of pressure-generating chambers each communicating with a respective one of the nozzle holes; a liquid supply system that supplies a first liquid to the plurality of pressure-generating chambers; an actuator placed adjacent to the plurality of pressure-generating chambers and configured to be driven to pressurize the plurality of pressure-generating chambers so that the first liquid in the plurality of pressure-generating chambers is injected from a nozzle injection port of the row of nozzle holes; and a nozzle guard that is formed so as to cover the row of nozzle holes, the nozzle guard comprising: a top portion located spaced from a surface of the nozzle body and having a slit opposed to the row of nozzle holes; a sealing portion that seals an area between a peripheral edge of the top portion and the nozzle body; and a suction flow path having a suction port open below the row of nozzle holes and communicating with an inside space of the nozzle guard; wherein a suction section connected to the suction flow path of the nozzle guard causes the inside space of the nozzle guard to be a negative pressure chamber; and wherein the first liquid overflowing into the negative pressure chamber is sucked from the nozzle holes.