Porous structure, ink jet recording head, methods of their production, and ink jet recorder

摘要

A porous structure in which water repellency can be kept for a long term; an inkjet recording head in which the nozzle surface is superior in water repellency properties, and high printing quality can be maintained for a long term; a method of manufacturing such a porous structure and such an ink-jet recording head; and an ink-jet recording apparatus provided with such an ink-jet recording head. In a porous structure (100), recess portions (17) and protrusion portions (18) are formed on the surface of a substrate of the porous structure. The height of the protrusion portions (18) on the surface of the substrate is uniform. In addition, the recess portions (17) and the protrusion portions (18) are formed to have such a size that a liquid drop (21) does not fall down into the recess portion (17), and can contact with an air layer (20) in the recess portion (17). The porous structure (100) is adopted in the ink ejecting surface except for ink ejecting holes in an ink-jet recording head. The ink-jet recording head is mounted on an ink-jet recording apparatus.