Ink jet head, method for producing ink jet head, and discharge direction correcting method for ink jet head

摘要

An ink jet head includes a channel unit including a manifold plate and a nozzle plate. The manifold plate has annular grooves. The nozzle plate has annular grooves and nozzles. Each manifold plate annular groove and each nozzle plate annular groove form an annular cavity around one of the nozzles in the channel unit, so that a less rigid region is formed near the nozzle. In a detecting step, the directional deviation of the ink discharged from a nozzle is detected. The detecting step is followed by a deforming step for deforming the nozzle plate by radiating a laser beam to a radiation region in the less rigid region near a defective nozzle. The radiation region varies with the direction and amount in which the ink discharged from the defective nozzle deviates. A nozzle is regarded as defective if the ink discharged from it deviates directionally beyond a specified amount.