Patent ID: 7675220

Claim:
A method of driving a piezoelectric device comprising a substrate, a substrate-side electrode formed on said substrate, a piezoelectric film formed on said substrate-side electrode and having a perovskite-type crystal structure represented by the general formula Pb(Ti x ,Zr y ,M z )O 3 , and an obverse-surface-side electrode formed on said piezoelectric film, comprising: a first drive step of applying a specified drive voltage between said obverse-surface-side electrode and said substrate-side electrode to drive said piezoelectric device during a first drive period; a standby step of suspending a drive of said piezoelectric device to keep said piezoelectric device on standby during a drive standby period; and a second drive step of applying said specified drive voltage between said obverse-surface-side electrode and said substrate-side electrode to drive said piezoelectric device during a second drive period that follows said first drive period, wherein during said drive standby period between said first drive period and said second drive period, a reverse electric field with respect to a drive electric field formed in said piezoelectric film by said specified drive voltage routinely applied during a drive of said piezoelectric device is applied to said piezoelectric film for a specified period of time.