Patent ID: 7686434

Claim:
An inkjet recording system comprising an inkjet recording head in which a part of wall face of a pressure chamber in which a nozzle is provided is formed of a piezoelectric element, and said piezoelectric element is activated and deformed to make pressure wave act on ink in said pressure chamber, thereby discharging an ink droplet from said nozzle, wherein a surface of the piezoelectric element forming said part of wall face of the pressure chamber has a centerline average roughness Ra ranging from 0.05 to 2 μm, and a contact angle θ with ink is 45 degrees or less, and the following expression (1) is satisfied; A cos 2 θ>0.04 (1) wherein A represents centerline average roughness Ra (μm) of surface of piezoelectric element forming wall surface of the pressure chamber, and θ represents contact angle of ink with respect to piezoelectric element.