Patent ID: 7641320

Claim:
An ink jet head, comprising: a plurality of first ink chambers formed upon a piezoelectric substrate, front end portions of which open at a first end surface of said substrate, and rear end portions of which are blocked; a plurality of second ink chambers formed upon said piezoelectric substrate, front end portions of which open at a second end surface which is opposite to said first end surface, and rear end portions of which are blocked; electrodes formed upon inner walls of said first ink chambers and said second ink chambers; a first common ink chamber formed upon said piezoelectric substrate between said rear end portions of said second ink chambers and said first end surface, and communicated with said first ink chambers; a second common ink chamber formed upon said piezoelectric substrate between said rear end portions of said first ink chambers and said second end surface, and communicated with said second ink chambers; and a nozzle plate covering said first ink chambers and said second ink chambers, and having nozzle holes formed to correspond to those ink chambers.