Patent ID: 6271619
Filing Date: 2001-08-07
Classification: H03H

Abstract:
A piezoelectric thin film device, comprising:a substrate having a top surface and a bottom surface;a piezoelectric thin film formed on the top surface of said substrate; andthin film electrodes formed on the upper and lower surfaces of said piezoelectric thin film,wherein an alternating voltage is applied across said thin film electrodes to resonance said portion of said piezoelectric thin film,wherein a portion of said substrate under said piezoelectric thin film is partially or entirely removed to form a recess, said recess being opened to air at the top surface of said substrate, andwherein said device further includes at least one bridge supported at one end thereof on at least said piezoelectric thin film, said thin film electrode, or an insulating film formed between said substrate and said piezoelectric thin film and the other end thereof on at least a portion of said substrate outside said recess, wherein said portion to be resonated is supported by said bridge.