Patent ID: 8213128

Claim:
A head-gimbal assembly, comprising: a slider, a gimbal comprising a first surface that is affixed to said slider, a load beam affixed to a surface opposite said first surface of said gimbal, a deformable plate affixed to a back side of said load beam, a piezoelectric element affixed to said deformable plate, a base plate that is affixed to said deformable plate behind said piezoelectric element and is separated from said piezoelectric element; wherein said deformable plate comprises: a hole where at least a portion pierces through; a first section that is in front of said hole and is affixed to said load beam; a second section that is behind said hole and is affixed to said base plate; and first and second spring members that join said first section and said second section, can deform in a front-back direction in response to a motion of said piezoelectric element, and are positioned to sandwich said hole in a left-right direction; wherein said piezoelectric element is affixed between said first section and said second section; wherein said base plate comprises projection members that are on a front edge of said plate and project out toward said first section while avoiding said piezoelectric element; and wherein front edges of said projection member are positioned further to a front edge than a back edge of said hole.