Patent ID: 8104858

Claim:
An inkjet head, comprising: an ejection port which ejects ink; an ink flow path which supplies the ink to the ejection port; an ejection actuator which supplies ejection energy to the ink in the ink flow path, the ejection energy causing the ink to be ejected from the ejection port; a wall portion located at a position farther from the ejection port along the ink flow path than a position at which the ejection energy is supplied, the wall portion defining an inner wall surface of the ink flow path; a temperature sensor configured to detect a temperature of the ink in the flow path; and a controller configured to cause the wall portion to be deformed based on a temperature detected by the temperature sensor such that a cross section of the ink flow path in a direction orthogonal to an ink-flow direction decreases as the temperature detected by the temperature sensor increases, and the cross section of the ink flow path in the direction orthogonal to the ink-flow direction increases as the temperature detected by the temperature sensor decreases.