| 摘要 |
An ink jet head includes a piezoelectric element including pressure chambers and partition walls, a nozzle plate including nozzles which are laser-machined, an adhesive which adheres the nozzle plate to the partition walls, a first protection film covering an electrode, and a second protection film which is stacked on the first protection film. The adhesive includes an excess portion which protrudes into the pressure chamber. A cut portion along a direction of radiation of a laser beam is formed at the excess portion. The second protection film includes a damage hole at an area on which the laser beam is made incident. The first protection film is exposed from the damage hole. A part of the first protection film, which corresponds to the damage hole, has a film thickness of 0.1 μm to 0.5 μm, and the first protection film has a refractive index of 1.1 to 2.0. |
