Piezoelectric composite device, method of manufacturing same, method of controlling same, input-output device, and electronic device

Abstract

Disclosed herein is a piezoelectric composite device including: a feeding electrode; a common electrode; a signal detecting electrode; a first piezoelectric element joined between the feeding electrode and the common electrode; and a second piezoelectric element joined between the common electrode and the signal detecting electrode; a predetermined voltage being supplied between the feeding electrode and the common electrode; and a force detection signal based on an external force being extracted from the detecting electrode.

1 . 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 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; 
 wherein said piezoelectric composite device including:  
 a feeding electrode;  
 a common electrode;  
 a signal detecting electrode;  
 a first piezoelectric element joined between said feeding electrode and said common electrode; and  
 a second piezoelectric element joined between said common electrode and said signal detecting electrode;  
 wherein a predetermined voltage being supplied between said feeding electrode and said common electrode; and  
 wherein a force detection signal based on an external force being extracted from said detecting electrode.  
   
   
   
       2 . The electronic device as claimed in  claim 1 , further comprising a control device connected to each of said feeding electrode, said common electrode, and said signal detecting electrode, 
 wherein said control device supplies power between said feeding electrode and said common electrode according to a preset control signal and detects a force detection signal from said signal detecting electrode.    
   
   
       3 . The electronic device as claimed in  claim 2 , 
 wherein said control device controls feeding to said feeding electrode on a basis of the force detection signal obtained from said signal detecting electrode.    
   
   
       4 . The electronic device as claimed in  claim 2 , further comprising display means for displaying said input information, 
 wherein said control device detects a force of the operating object selecting an input item displayed by said display means, and determines that said input item is selected on a basis of the detected force of said operating object.    
   
   
       5 . The electronic device as claimed in  claim 4 , 
 wherein said control device determines that said input item is selected on a basis of the force detection signal obtained from said signal detecting electrode, and then gives a tactile stimulus to said operating object by controlling feeding to said feeding electrode.