Inkjet head, inkjet recording apparatus, liquid droplet ejecting apparatus, and image forming apparatus

An inkjet head, wherein a vibrating plate is formed on a liquid chamber substrate on which multiple dedicated liquid chambers are aligned, each one of the dedicated liquid chambers being partitioned from the respectively neighboring one of the dedicated liquid chambers by a partition wall, and wherein a piezoelectric element is formed on the side facing the dedicated liquid chambers on the vibrating plate, the piezoelectric element including a lower electrode, a piezoelectric material, and an upper electrode, the inkjet head to be pulled out to a drive signal input section with a dedicated electrode wiring which is in conductive communication with the upper electrode;

• wherein
• a first insulating film and a second insulating film are formed between the dedicated electrode wiring and the lower electrode at least in an area in which the dedicated electrode wiring and the lower electrode overlap;
• wherein
• a third insulating film and a fourth insulating film are stacked in an area which includes a forming area of the dedicated electrode wiring except the drive signal input section;
• wherein,
• in at least a portion of a forming area of the dedicated liquid chambers, there is provided a non-film forming area in which the second insulating film and the third insulating film are not formed, or in which the first insulating film and the second insulating film and the third insulating film are not formed;
• and wherein,
• in an area including a piezoelectric element forming section, either the first insulating film and the fourth insulating film are formed in the non-film forming area in which the second insulating film and the third insulating film are not formed, or the fourth insulating film is formed in the non-film forming area in which the first insulating film and the second insulating film and the third insulating film are not formed.