Patent ID: 8727505

Claim:
An electromechanical transducer element that includes an electromechanical transducer film formed of a complex oxide (PZT) including lead (Pb), zirconium (Zr), and titanium (Ti), wherein the electromechanical transducer film is produced by depositing a chemical solution, wherein the electromechanical transducer film is formed by laminating plural PZT thin films and crystallizing each PZT precursor film until a thickness of the formed electromechanical transducer film becomes a predetermined thickness, wherein, when an atomic weight ratio (Pb/(Zr+Ti)) of average Pb included in the formed electromechanical transducer film having the predetermined thickness is denoted by Pb(avg) and an atomic weight ratio (Pb/(Zr+Ti)) of Pb in any first one of laminate interfaces of the plural PZT thin films included in the formed electromechanical transducer film is denoted by Pb(interface), the Pb(avg) is greater than or equal to 100 atomic percentage (at %) and less than or equal to 110 atomic percentage (at %), and a fluctuation ratio ΔPb=Pb(avg)−Pb(interface) of Pb in the first one of the laminate interfaces is less than or equal to 20 percent.