Patent ID: 7810913
Filing Date: 2010-10-12
Classification: B41J

Abstract:
1. 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 centerline average roughness Ra of said piezoelectric element ranges from 0.05 to 2 μm, viscosity of said ink ranges from 2.0 to 10.0 mPa·s, and the following expression (1) is satisfied; wherein r represents centerline average roughness (μm) of surface of piezoelectric element forming wall face of the pressure chamber, γ represents surface tension (mN/m) of ink, η represents viscosity of ink (mPa·s), and θ represents contact angle (degree) of ink with respect to piezoelectric element.