Patent ID: 7446456

Claim:
An electronic device comprising: an input-output device, including: input means for detecting a contact position of an operating object and outputting input information; and tactile sense providing and information determining means for providing a tactile sense to said operating object operating said input means, and detecting a physical pressing force at the contact position of said operating object and determining said input information; wherein said tactile sense providing and information determining means of said input-output device includes a piezoelectric composite device; and wherein said piezoelectric composite device includes: a first laminate and a second laminate each having a lead electrode and formed by laminating one or more piezoelectric elements, and a third laminate having another lead electrode and having one or more piezoelectric elements laminated between said first laminate and said second laminate, wherein 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 wherein when the physical pressing force is applied to said third laminate from the operating object applying the physical pressing force from external to the first laminate or the second laminate, the one or more piezoelectric elements of said third laminate output a physical pressing force detection signal from the lead electrode of said third laminate.