Patent ID: 7554246

Claim:
A piezoelectric composite device comprising: a first laminate and a second laminate each of which is formed by laminating three or more lead electrodes and two or more piezoelectric elements, and having two leads alternately connected to the three or more lead electrodes; a third laminate having three or more lead electrodes, two or more piezoelectric elements laminated together and three leads alternately connected to the three or more lead electrodes, said third laminate positioned between said first laminate and said second laminate; and piezoelectric elements positioned between said first laminate and said third laminate and between said second laminate and said third laminate functioning as cushion elements, wherein, the three or more lead electrodes of each of said first laminate and said second laminate are alternately connected to each other within said piezoelectric composite device, the three or more lead electrodes of said third laminate are alternately connected to each other within said piezoelectric composite device, when power is supplied to the lead electrodes of said first laminate and said second laminate, the piezoelectric elements of said first laminate and said second laminate vibrate, and when an external contact force is applied to said piezoelectric composite device by an operating object, the piezoelectric elements of said third laminate output a force detection signal from the lead electrodes of said third laminate.